Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_transport.c |
| 3 | * |
| 4 | * This file contains the Generic Target Engine Core. |
| 5 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 6 | * (c) Copyright 2002-2013 Datera, Inc. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 7 | * |
| 8 | * Nicholas A. Bellinger <nab@kernel.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | * |
| 24 | ******************************************************************************/ |
| 25 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 26 | #include <linux/net.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/timer.h> |
| 30 | #include <linux/slab.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 31 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 32 | #include <linux/kthread.h> |
| 33 | #include <linux/in.h> |
| 34 | #include <linux/cdrom.h> |
Paul Gortmaker | 827509e | 2011-08-30 14:20:44 -0400 | [diff] [blame] | 35 | #include <linux/module.h> |
Roland Dreier | 015487b | 2012-02-13 16:18:17 -0800 | [diff] [blame] | 36 | #include <linux/ratelimit.h> |
David S. Miller | 5538d29 | 2015-05-28 11:35:41 -0700 | [diff] [blame] | 37 | #include <linux/vmalloc.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 38 | #include <asm/unaligned.h> |
| 39 | #include <net/sock.h> |
| 40 | #include <net/tcp.h> |
Bart Van Assche | ba92999 | 2015-05-08 10:11:12 +0200 | [diff] [blame] | 41 | #include <scsi/scsi_proto.h> |
Sagi Grimberg | 9ec1e1c | 2015-07-08 17:58:53 +0300 | [diff] [blame] | 42 | #include <scsi/scsi_common.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 43 | |
| 44 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 45 | #include <target/target_core_backend.h> |
| 46 | #include <target/target_core_fabric.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 47 | |
Christoph Hellwig | e26d99a | 2011-11-14 12:30:30 -0500 | [diff] [blame] | 48 | #include "target_core_internal.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 49 | #include "target_core_alua.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 50 | #include "target_core_pr.h" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 51 | #include "target_core_ua.h" |
| 52 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 53 | #define CREATE_TRACE_POINTS |
| 54 | #include <trace/events/target.h> |
| 55 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 56 | static struct workqueue_struct *target_completion_wq; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 57 | static struct kmem_cache *se_sess_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 58 | struct kmem_cache *se_ua_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 59 | struct kmem_cache *t10_pr_reg_cache; |
| 60 | struct kmem_cache *t10_alua_lu_gp_cache; |
| 61 | struct kmem_cache *t10_alua_lu_gp_mem_cache; |
| 62 | struct kmem_cache *t10_alua_tg_pt_gp_cache; |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 63 | struct kmem_cache *t10_alua_lba_map_cache; |
| 64 | struct kmem_cache *t10_alua_lba_map_mem_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 66 | static void transport_complete_task_attr(struct se_cmd *cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 67 | static void transport_handle_queue_full(struct se_cmd *cmd, |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 68 | struct se_device *dev); |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 69 | static int transport_put_cmd(struct se_cmd *cmd); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 70 | static void target_complete_ok_work(struct work_struct *work); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 71 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 72 | int init_se_kmem_caches(void) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 73 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 74 | se_sess_cache = kmem_cache_create("se_sess_cache", |
| 75 | sizeof(struct se_session), __alignof__(struct se_session), |
| 76 | 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 77 | if (!se_sess_cache) { |
| 78 | pr_err("kmem_cache_create() for struct se_session" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 79 | " failed\n"); |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 80 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 81 | } |
| 82 | se_ua_cache = kmem_cache_create("se_ua_cache", |
| 83 | sizeof(struct se_ua), __alignof__(struct se_ua), |
| 84 | 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 85 | if (!se_ua_cache) { |
| 86 | pr_err("kmem_cache_create() for struct se_ua failed\n"); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 87 | goto out_free_sess_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 88 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 89 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
| 90 | sizeof(struct t10_pr_registration), |
| 91 | __alignof__(struct t10_pr_registration), 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 92 | if (!t10_pr_reg_cache) { |
| 93 | pr_err("kmem_cache_create() for struct t10_pr_registration" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 94 | " failed\n"); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 95 | goto out_free_ua_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 96 | } |
| 97 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", |
| 98 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), |
| 99 | 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 100 | if (!t10_alua_lu_gp_cache) { |
| 101 | pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 102 | " failed\n"); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 103 | goto out_free_pr_reg_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 104 | } |
| 105 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", |
| 106 | sizeof(struct t10_alua_lu_gp_member), |
| 107 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 108 | if (!t10_alua_lu_gp_mem_cache) { |
| 109 | pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 110 | "cache failed\n"); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 111 | goto out_free_lu_gp_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 112 | } |
| 113 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", |
| 114 | sizeof(struct t10_alua_tg_pt_gp), |
| 115 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 116 | if (!t10_alua_tg_pt_gp_cache) { |
| 117 | pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 118 | "cache failed\n"); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 119 | goto out_free_lu_gp_mem_cache; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 120 | } |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 121 | t10_alua_lba_map_cache = kmem_cache_create( |
| 122 | "t10_alua_lba_map_cache", |
| 123 | sizeof(struct t10_alua_lba_map), |
| 124 | __alignof__(struct t10_alua_lba_map), 0, NULL); |
| 125 | if (!t10_alua_lba_map_cache) { |
| 126 | pr_err("kmem_cache_create() for t10_alua_lba_map_" |
| 127 | "cache failed\n"); |
Christoph Hellwig | adf653f | 2015-05-25 21:33:08 -0700 | [diff] [blame] | 128 | goto out_free_tg_pt_gp_cache; |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 129 | } |
| 130 | t10_alua_lba_map_mem_cache = kmem_cache_create( |
| 131 | "t10_alua_lba_map_mem_cache", |
| 132 | sizeof(struct t10_alua_lba_map_member), |
| 133 | __alignof__(struct t10_alua_lba_map_member), 0, NULL); |
| 134 | if (!t10_alua_lba_map_mem_cache) { |
| 135 | pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" |
| 136 | "cache failed\n"); |
| 137 | goto out_free_lba_map_cache; |
| 138 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 139 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 140 | target_completion_wq = alloc_workqueue("target_completion", |
| 141 | WQ_MEM_RECLAIM, 0); |
| 142 | if (!target_completion_wq) |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 143 | goto out_free_lba_map_mem_cache; |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 144 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 145 | return 0; |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 146 | |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 147 | out_free_lba_map_mem_cache: |
| 148 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); |
| 149 | out_free_lba_map_cache: |
| 150 | kmem_cache_destroy(t10_alua_lba_map_cache); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 151 | out_free_tg_pt_gp_cache: |
| 152 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
| 153 | out_free_lu_gp_mem_cache: |
| 154 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 155 | out_free_lu_gp_cache: |
| 156 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 157 | out_free_pr_reg_cache: |
| 158 | kmem_cache_destroy(t10_pr_reg_cache); |
| 159 | out_free_ua_cache: |
| 160 | kmem_cache_destroy(se_ua_cache); |
| 161 | out_free_sess_cache: |
| 162 | kmem_cache_destroy(se_sess_cache); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 163 | out: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 164 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 165 | } |
| 166 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 167 | void release_se_kmem_caches(void) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 168 | { |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 169 | destroy_workqueue(target_completion_wq); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 170 | kmem_cache_destroy(se_sess_cache); |
| 171 | kmem_cache_destroy(se_ua_cache); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 172 | kmem_cache_destroy(t10_pr_reg_cache); |
| 173 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 174 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 175 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
Hannes Reinecke | 229d4f1 | 2013-12-17 09:18:50 +0100 | [diff] [blame] | 176 | kmem_cache_destroy(t10_alua_lba_map_cache); |
| 177 | kmem_cache_destroy(t10_alua_lba_map_mem_cache); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 178 | } |
| 179 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 180 | /* This code ensures unique mib indexes are handed out. */ |
| 181 | static DEFINE_SPINLOCK(scsi_mib_index_lock); |
| 182 | static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; |
Nicholas Bellinger | e89d15e | 2011-02-09 15:35:03 -0800 | [diff] [blame] | 183 | |
| 184 | /* |
| 185 | * Allocate a new row index for the entry type specified |
| 186 | */ |
| 187 | u32 scsi_get_new_index(scsi_index_t type) |
| 188 | { |
| 189 | u32 new_index; |
| 190 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 191 | BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); |
Nicholas Bellinger | e89d15e | 2011-02-09 15:35:03 -0800 | [diff] [blame] | 192 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 193 | spin_lock(&scsi_mib_index_lock); |
| 194 | new_index = ++scsi_mib_index[type]; |
| 195 | spin_unlock(&scsi_mib_index_lock); |
Nicholas Bellinger | e89d15e | 2011-02-09 15:35:03 -0800 | [diff] [blame] | 196 | |
| 197 | return new_index; |
| 198 | } |
| 199 | |
Nicholas Bellinger | dbc5623 | 2011-10-22 01:03:54 -0700 | [diff] [blame] | 200 | void transport_subsystem_check_init(void) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 201 | { |
| 202 | int ret; |
Andy Grover | 283669d | 2012-07-30 15:54:17 -0700 | [diff] [blame] | 203 | static int sub_api_initialized; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 204 | |
Nicholas Bellinger | dbc5623 | 2011-10-22 01:03:54 -0700 | [diff] [blame] | 205 | if (sub_api_initialized) |
| 206 | return; |
| 207 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 208 | ret = request_module("target_core_iblock"); |
| 209 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 210 | pr_err("Unable to load target_core_iblock\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 211 | |
| 212 | ret = request_module("target_core_file"); |
| 213 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 214 | pr_err("Unable to load target_core_file\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 215 | |
| 216 | ret = request_module("target_core_pscsi"); |
| 217 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 218 | pr_err("Unable to load target_core_pscsi\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 219 | |
Andy Grover | 7c9e7a6 | 2014-10-01 16:07:05 -0700 | [diff] [blame] | 220 | ret = request_module("target_core_user"); |
| 221 | if (ret != 0) |
| 222 | pr_err("Unable to load target_core_user\n"); |
| 223 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 224 | sub_api_initialized = 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 225 | } |
| 226 | |
Nicholas Bellinger | e70beee | 2014-04-02 12:52:38 -0700 | [diff] [blame] | 227 | struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 228 | { |
| 229 | struct se_session *se_sess; |
| 230 | |
| 231 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 232 | if (!se_sess) { |
| 233 | pr_err("Unable to allocate struct se_session from" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 234 | " se_sess_cache\n"); |
| 235 | return ERR_PTR(-ENOMEM); |
| 236 | } |
| 237 | INIT_LIST_HEAD(&se_sess->sess_list); |
| 238 | INIT_LIST_HEAD(&se_sess->sess_acl_list); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 239 | INIT_LIST_HEAD(&se_sess->sess_cmd_list); |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 240 | INIT_LIST_HEAD(&se_sess->sess_wait_list); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 241 | spin_lock_init(&se_sess->sess_cmd_lock); |
Nicholas Bellinger | e70beee | 2014-04-02 12:52:38 -0700 | [diff] [blame] | 242 | se_sess->sup_prot_ops = sup_prot_ops; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 243 | |
| 244 | return se_sess; |
| 245 | } |
| 246 | EXPORT_SYMBOL(transport_init_session); |
| 247 | |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 248 | int transport_alloc_session_tags(struct se_session *se_sess, |
| 249 | unsigned int tag_num, unsigned int tag_size) |
| 250 | { |
| 251 | int rc; |
| 252 | |
Nicholas Bellinger | 8c7f6e9 | 2013-09-23 11:57:38 -0700 | [diff] [blame] | 253 | se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, |
| 254 | GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 255 | if (!se_sess->sess_cmd_map) { |
Nicholas Bellinger | 8c7f6e9 | 2013-09-23 11:57:38 -0700 | [diff] [blame] | 256 | se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); |
| 257 | if (!se_sess->sess_cmd_map) { |
| 258 | pr_err("Unable to allocate se_sess->sess_cmd_map\n"); |
| 259 | return -ENOMEM; |
| 260 | } |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); |
| 264 | if (rc < 0) { |
| 265 | pr_err("Unable to init se_sess->sess_tag_pool," |
| 266 | " tag_num: %u\n", tag_num); |
Pekka Enberg | de64d3a | 2015-06-30 14:59:24 -0700 | [diff] [blame] | 267 | kvfree(se_sess->sess_cmd_map); |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 268 | se_sess->sess_cmd_map = NULL; |
| 269 | return -ENOMEM; |
| 270 | } |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | EXPORT_SYMBOL(transport_alloc_session_tags); |
| 275 | |
| 276 | struct se_session *transport_init_session_tags(unsigned int tag_num, |
Nicholas Bellinger | e70beee | 2014-04-02 12:52:38 -0700 | [diff] [blame] | 277 | unsigned int tag_size, |
| 278 | enum target_prot_op sup_prot_ops) |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 279 | { |
| 280 | struct se_session *se_sess; |
| 281 | int rc; |
| 282 | |
Nicholas Bellinger | 7861728 | 2016-01-09 05:29:24 -0800 | [diff] [blame] | 283 | if (tag_num != 0 && !tag_size) { |
| 284 | pr_err("init_session_tags called with percpu-ida tag_num:" |
| 285 | " %u, but zero tag_size\n", tag_num); |
| 286 | return ERR_PTR(-EINVAL); |
| 287 | } |
| 288 | if (!tag_num && tag_size) { |
| 289 | pr_err("init_session_tags called with percpu-ida tag_size:" |
| 290 | " %u, but zero tag_num\n", tag_size); |
| 291 | return ERR_PTR(-EINVAL); |
| 292 | } |
| 293 | |
Nicholas Bellinger | e70beee | 2014-04-02 12:52:38 -0700 | [diff] [blame] | 294 | se_sess = transport_init_session(sup_prot_ops); |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 295 | if (IS_ERR(se_sess)) |
| 296 | return se_sess; |
| 297 | |
| 298 | rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); |
| 299 | if (rc < 0) { |
| 300 | transport_free_session(se_sess); |
| 301 | return ERR_PTR(-ENOMEM); |
| 302 | } |
| 303 | |
| 304 | return se_sess; |
| 305 | } |
| 306 | EXPORT_SYMBOL(transport_init_session_tags); |
| 307 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 308 | /* |
Nicholas Bellinger | 140854c | 2011-08-31 12:34:39 -0700 | [diff] [blame] | 309 | * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 310 | */ |
| 311 | void __transport_register_session( |
| 312 | struct se_portal_group *se_tpg, |
| 313 | struct se_node_acl *se_nacl, |
| 314 | struct se_session *se_sess, |
| 315 | void *fabric_sess_ptr) |
| 316 | { |
Christoph Hellwig | 9ac8928 | 2015-04-08 20:01:35 +0200 | [diff] [blame] | 317 | const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 318 | unsigned char buf[PR_REG_ISID_LEN]; |
| 319 | |
| 320 | se_sess->se_tpg = se_tpg; |
| 321 | se_sess->fabric_sess_ptr = fabric_sess_ptr; |
| 322 | /* |
| 323 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t |
| 324 | * |
| 325 | * Only set for struct se_session's that will actually be moving I/O. |
| 326 | * eg: *NOT* discovery sessions. |
| 327 | */ |
| 328 | if (se_nacl) { |
| 329 | /* |
Nicholas Bellinger | bffb512 | 2015-04-14 11:52:22 -0700 | [diff] [blame] | 330 | * |
| 331 | * Determine if fabric allows for T10-PI feature bits exposed to |
| 332 | * initiators for device backends with !dev->dev_attrib.pi_prot_type. |
| 333 | * |
| 334 | * If so, then always save prot_type on a per se_node_acl node |
| 335 | * basis and re-instate the previous sess_prot_type to avoid |
| 336 | * disabling PI from below any previously initiator side |
| 337 | * registered LUNs. |
| 338 | */ |
| 339 | if (se_nacl->saved_prot_type) |
| 340 | se_sess->sess_prot_type = se_nacl->saved_prot_type; |
| 341 | else if (tfo->tpg_check_prot_fabric_only) |
| 342 | se_sess->sess_prot_type = se_nacl->saved_prot_type = |
| 343 | tfo->tpg_check_prot_fabric_only(se_tpg); |
| 344 | /* |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 345 | * If the fabric module supports an ISID based TransportID, |
| 346 | * save this value in binary from the fabric I_T Nexus now. |
| 347 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 348 | if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 349 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 350 | se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 351 | &buf[0], PR_REG_ISID_LEN); |
| 352 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); |
| 353 | } |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 354 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 355 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
| 356 | /* |
| 357 | * The se_nacl->nacl_sess pointer will be set to the |
| 358 | * last active I_T Nexus for each struct se_node_acl. |
| 359 | */ |
| 360 | se_nacl->nacl_sess = se_sess; |
| 361 | |
| 362 | list_add_tail(&se_sess->sess_acl_list, |
| 363 | &se_nacl->acl_sess_list); |
| 364 | spin_unlock_irq(&se_nacl->nacl_sess_lock); |
| 365 | } |
| 366 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); |
| 367 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 368 | pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 369 | se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 370 | } |
| 371 | EXPORT_SYMBOL(__transport_register_session); |
| 372 | |
| 373 | void transport_register_session( |
| 374 | struct se_portal_group *se_tpg, |
| 375 | struct se_node_acl *se_nacl, |
| 376 | struct se_session *se_sess, |
| 377 | void *fabric_sess_ptr) |
| 378 | { |
Nicholas Bellinger | 140854c | 2011-08-31 12:34:39 -0700 | [diff] [blame] | 379 | unsigned long flags; |
| 380 | |
| 381 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 382 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
Nicholas Bellinger | 140854c | 2011-08-31 12:34:39 -0700 | [diff] [blame] | 383 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 384 | } |
| 385 | EXPORT_SYMBOL(transport_register_session); |
| 386 | |
Nicholas Bellinger | 7861728 | 2016-01-09 05:29:24 -0800 | [diff] [blame] | 387 | struct se_session * |
| 388 | target_alloc_session(struct se_portal_group *tpg, |
| 389 | unsigned int tag_num, unsigned int tag_size, |
| 390 | enum target_prot_op prot_op, |
| 391 | const char *initiatorname, void *private, |
| 392 | int (*callback)(struct se_portal_group *, |
| 393 | struct se_session *, void *)) |
| 394 | { |
| 395 | struct se_session *sess; |
| 396 | |
| 397 | /* |
| 398 | * If the fabric driver is using percpu-ida based pre allocation |
| 399 | * of I/O descriptor tags, go ahead and perform that setup now.. |
| 400 | */ |
| 401 | if (tag_num != 0) |
| 402 | sess = transport_init_session_tags(tag_num, tag_size, prot_op); |
| 403 | else |
| 404 | sess = transport_init_session(prot_op); |
| 405 | |
| 406 | if (IS_ERR(sess)) |
| 407 | return sess; |
| 408 | |
| 409 | sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg, |
| 410 | (unsigned char *)initiatorname); |
| 411 | if (!sess->se_node_acl) { |
| 412 | transport_free_session(sess); |
| 413 | return ERR_PTR(-EACCES); |
| 414 | } |
| 415 | /* |
| 416 | * Go ahead and perform any remaining fabric setup that is |
| 417 | * required before transport_register_session(). |
| 418 | */ |
| 419 | if (callback != NULL) { |
| 420 | int rc = callback(tpg, sess, private); |
| 421 | if (rc) { |
| 422 | transport_free_session(sess); |
| 423 | return ERR_PTR(rc); |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | transport_register_session(tpg, sess->se_node_acl, sess, private); |
| 428 | return sess; |
| 429 | } |
| 430 | EXPORT_SYMBOL(target_alloc_session); |
| 431 | |
Nicholas Bellinger | f8e471f | 2015-03-06 20:34:32 -0800 | [diff] [blame] | 432 | ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) |
| 433 | { |
| 434 | struct se_session *se_sess; |
| 435 | ssize_t len = 0; |
| 436 | |
| 437 | spin_lock_bh(&se_tpg->session_lock); |
| 438 | list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { |
| 439 | if (!se_sess->se_node_acl) |
| 440 | continue; |
| 441 | if (!se_sess->se_node_acl->dynamic_node_acl) |
| 442 | continue; |
| 443 | if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) |
| 444 | break; |
| 445 | |
| 446 | len += snprintf(page + len, PAGE_SIZE - len, "%s\n", |
| 447 | se_sess->se_node_acl->initiatorname); |
| 448 | len += 1; /* Include NULL terminator */ |
| 449 | } |
| 450 | spin_unlock_bh(&se_tpg->session_lock); |
| 451 | |
| 452 | return len; |
| 453 | } |
| 454 | EXPORT_SYMBOL(target_show_dynamic_sessions); |
| 455 | |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 456 | static void target_complete_nacl(struct kref *kref) |
| 457 | { |
| 458 | struct se_node_acl *nacl = container_of(kref, |
| 459 | struct se_node_acl, acl_kref); |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 460 | struct se_portal_group *se_tpg = nacl->se_tpg; |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 461 | |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 462 | if (!nacl->dynamic_stop) { |
| 463 | complete(&nacl->acl_free_comp); |
| 464 | return; |
| 465 | } |
| 466 | |
| 467 | mutex_lock(&se_tpg->acl_node_mutex); |
Nicholas Bellinger | 1da30c2 | 2017-08-06 16:10:03 -0700 | [diff] [blame] | 468 | list_del_init(&nacl->acl_list); |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 469 | mutex_unlock(&se_tpg->acl_node_mutex); |
| 470 | |
| 471 | core_tpg_wait_for_nacl_pr_ref(nacl); |
| 472 | core_free_device_list_for_node(nacl, se_tpg); |
| 473 | kfree(nacl); |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | void target_put_nacl(struct se_node_acl *nacl) |
| 477 | { |
| 478 | kref_put(&nacl->acl_kref, target_complete_nacl); |
| 479 | } |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 480 | EXPORT_SYMBOL(target_put_nacl); |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 481 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 482 | void transport_deregister_session_configfs(struct se_session *se_sess) |
| 483 | { |
| 484 | struct se_node_acl *se_nacl; |
Roland Dreier | 2338886 | 2011-06-22 01:02:21 -0700 | [diff] [blame] | 485 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 486 | /* |
| 487 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session |
| 488 | */ |
| 489 | se_nacl = se_sess->se_node_acl; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 490 | if (se_nacl) { |
Roland Dreier | 2338886 | 2011-06-22 01:02:21 -0700 | [diff] [blame] | 491 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
Christoph Hellwig | fba81f8 | 2016-05-02 15:45:20 +0200 | [diff] [blame] | 492 | if (!list_empty(&se_sess->sess_acl_list)) |
| 493 | list_del_init(&se_sess->sess_acl_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 494 | /* |
| 495 | * If the session list is empty, then clear the pointer. |
| 496 | * Otherwise, set the struct se_session pointer from the tail |
| 497 | * element of the per struct se_node_acl active session list. |
| 498 | */ |
| 499 | if (list_empty(&se_nacl->acl_sess_list)) |
| 500 | se_nacl->nacl_sess = NULL; |
| 501 | else { |
| 502 | se_nacl->nacl_sess = container_of( |
| 503 | se_nacl->acl_sess_list.prev, |
| 504 | struct se_session, sess_acl_list); |
| 505 | } |
Roland Dreier | 2338886 | 2011-06-22 01:02:21 -0700 | [diff] [blame] | 506 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 507 | } |
| 508 | } |
| 509 | EXPORT_SYMBOL(transport_deregister_session_configfs); |
| 510 | |
| 511 | void transport_free_session(struct se_session *se_sess) |
| 512 | { |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 513 | struct se_node_acl *se_nacl = se_sess->se_node_acl; |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 514 | |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 515 | /* |
| 516 | * Drop the se_node_acl->nacl_kref obtained from within |
| 517 | * core_tpg_get_initiator_node_acl(). |
| 518 | */ |
| 519 | if (se_nacl) { |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 520 | struct se_portal_group *se_tpg = se_nacl->se_tpg; |
| 521 | const struct target_core_fabric_ops *se_tfo = se_tpg->se_tpg_tfo; |
| 522 | unsigned long flags; |
| 523 | |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 524 | se_sess->se_node_acl = NULL; |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 525 | |
| 526 | /* |
| 527 | * Also determine if we need to drop the extra ->cmd_kref if |
| 528 | * it had been previously dynamically generated, and |
| 529 | * the endpoint is not caching dynamic ACLs. |
| 530 | */ |
| 531 | mutex_lock(&se_tpg->acl_node_mutex); |
| 532 | if (se_nacl->dynamic_node_acl && |
| 533 | !se_tfo->tpg_check_demo_mode_cache(se_tpg)) { |
| 534 | spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); |
| 535 | if (list_empty(&se_nacl->acl_sess_list)) |
| 536 | se_nacl->dynamic_stop = true; |
| 537 | spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); |
| 538 | |
| 539 | if (se_nacl->dynamic_stop) |
Nicholas Bellinger | 1da30c2 | 2017-08-06 16:10:03 -0700 | [diff] [blame] | 540 | list_del_init(&se_nacl->acl_list); |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 541 | } |
| 542 | mutex_unlock(&se_tpg->acl_node_mutex); |
| 543 | |
| 544 | if (se_nacl->dynamic_stop) |
| 545 | target_put_nacl(se_nacl); |
| 546 | |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 547 | target_put_nacl(se_nacl); |
| 548 | } |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 549 | if (se_sess->sess_cmd_map) { |
| 550 | percpu_ida_destroy(&se_sess->sess_tag_pool); |
Pekka Enberg | de64d3a | 2015-06-30 14:59:24 -0700 | [diff] [blame] | 551 | kvfree(se_sess->sess_cmd_map); |
Nicholas Bellinger | c0add7f | 2013-06-07 17:38:58 -0700 | [diff] [blame] | 552 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 553 | kmem_cache_free(se_sess_cache, se_sess); |
| 554 | } |
| 555 | EXPORT_SYMBOL(transport_free_session); |
| 556 | |
| 557 | void transport_deregister_session(struct se_session *se_sess) |
| 558 | { |
| 559 | struct se_portal_group *se_tpg = se_sess->se_tpg; |
Roland Dreier | e63a8e1 | 2011-08-12 16:01:02 -0700 | [diff] [blame] | 560 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 561 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 562 | if (!se_tpg) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 563 | transport_free_session(se_sess); |
| 564 | return; |
| 565 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 566 | |
Roland Dreier | e63a8e1 | 2011-08-12 16:01:02 -0700 | [diff] [blame] | 567 | spin_lock_irqsave(&se_tpg->session_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 568 | list_del(&se_sess->sess_list); |
| 569 | se_sess->se_tpg = NULL; |
| 570 | se_sess->fabric_sess_ptr = NULL; |
Roland Dreier | e63a8e1 | 2011-08-12 16:01:02 -0700 | [diff] [blame] | 571 | spin_unlock_irqrestore(&se_tpg->session_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 572 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 573 | pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 574 | se_tpg->se_tpg_tfo->get_fabric_name()); |
Nicholas Bellinger | 0146834 | 2012-03-10 14:32:52 -0800 | [diff] [blame] | 575 | /* |
Hannes Reinecke | 125d011 | 2013-11-19 09:07:46 +0100 | [diff] [blame] | 576 | * If last kref is dropping now for an explicit NodeACL, awake sleeping |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 577 | * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group |
Nicholas Bellinger | 21aaa23 | 2016-01-07 22:09:27 -0800 | [diff] [blame] | 578 | * removal context from within transport_free_session() code. |
Nicholas Bellinger | 4978149 | 2016-12-07 12:55:54 -0800 | [diff] [blame] | 579 | * |
| 580 | * For dynamic ACL, target_put_nacl() uses target_complete_nacl() |
| 581 | * to release all remaining generate_node_acl=1 created ACL resources. |
Nicholas Bellinger | 0146834 | 2012-03-10 14:32:52 -0800 | [diff] [blame] | 582 | */ |
Nicholas Bellinger | 0146834 | 2012-03-10 14:32:52 -0800 | [diff] [blame] | 583 | |
Nicholas Bellinger | afb999f | 2012-03-08 23:45:02 -0800 | [diff] [blame] | 584 | transport_free_session(se_sess); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 585 | } |
| 586 | EXPORT_SYMBOL(transport_deregister_session); |
| 587 | |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 588 | static void target_remove_from_state_list(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 589 | { |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 590 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 591 | unsigned long flags; |
| 592 | |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 593 | if (!dev) |
| 594 | return; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 595 | |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 596 | if (cmd->transport_state & CMD_T_BUSY) |
| 597 | return; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 598 | |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 599 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 600 | if (cmd->state_active) { |
| 601 | list_del(&cmd->state_list); |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 602 | cmd->state_active = false; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 603 | } |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 604 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 605 | } |
| 606 | |
Nicholas Bellinger | 862e638 | 2013-06-06 01:35:18 -0700 | [diff] [blame] | 607 | static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, |
| 608 | bool write_pending) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 609 | { |
| 610 | unsigned long flags; |
| 611 | |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 612 | if (remove_from_lists) { |
| 613 | target_remove_from_state_list(cmd); |
| 614 | |
| 615 | /* |
| 616 | * Clear struct se_cmd->se_lun before the handoff to FE. |
| 617 | */ |
| 618 | cmd->se_lun = NULL; |
| 619 | } |
| 620 | |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 621 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 622 | if (write_pending) |
| 623 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
| 624 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 625 | /* |
| 626 | * Determine if frontend context caller is requesting the stopping of |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 627 | * this command for frontend exceptions. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 628 | */ |
Christoph Hellwig | 7d680f3b | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 629 | if (cmd->transport_state & CMD_T_STOP) { |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 630 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
| 631 | __func__, __LINE__, cmd->tag); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 632 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 633 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 634 | |
Nicholas Bellinger | a95d651 | 2014-06-09 23:36:51 +0000 | [diff] [blame] | 635 | complete_all(&cmd->t_transport_stop_comp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 636 | return 1; |
| 637 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 638 | |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 639 | cmd->transport_state &= ~CMD_T_ACTIVE; |
| 640 | if (remove_from_lists) { |
| 641 | /* |
| 642 | * Some fabric modules like tcm_loop can release |
| 643 | * their internally allocated I/O reference now and |
| 644 | * struct se_cmd now. |
| 645 | * |
| 646 | * Fabric modules are expected to return '1' here if the |
| 647 | * se_cmd being passed is released at this point, |
| 648 | * or zero if not being released. |
| 649 | */ |
| 650 | if (cmd->se_tfo->check_stop_free != NULL) { |
| 651 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 652 | return cmd->se_tfo->check_stop_free(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 653 | } |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 654 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 655 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 656 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) |
| 661 | { |
Nicholas Bellinger | 862e638 | 2013-06-06 01:35:18 -0700 | [diff] [blame] | 662 | return transport_cmd_check_stop(cmd, true, false); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | static void transport_lun_remove_cmd(struct se_cmd *cmd) |
| 666 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 667 | struct se_lun *lun = cmd->se_lun; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 668 | |
Nicholas Bellinger | 5259a06 | 2014-01-28 17:56:30 -0800 | [diff] [blame] | 669 | if (!lun) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 670 | return; |
| 671 | |
Nicholas Bellinger | 5259a06 | 2014-01-28 17:56:30 -0800 | [diff] [blame] | 672 | if (cmpxchg(&cmd->lun_ref_active, true, false)) |
| 673 | percpu_ref_put(&lun->lun_ref); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 674 | } |
| 675 | |
Nicholas Bellinger | 1f576d5 | 2017-06-02 20:00:17 -0700 | [diff] [blame] | 676 | int transport_cmd_finish_abort(struct se_cmd *cmd, int remove) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 677 | { |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 678 | bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF); |
Nicholas Bellinger | 1f576d5 | 2017-06-02 20:00:17 -0700 | [diff] [blame] | 679 | int ret = 0; |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 680 | |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 681 | if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) |
| 682 | transport_lun_remove_cmd(cmd); |
Nicholas Bellinger | 131e6ab | 2014-03-22 14:55:56 -0700 | [diff] [blame] | 683 | /* |
| 684 | * Allow the fabric driver to unmap any resources before |
| 685 | * releasing the descriptor via TFO->release_cmd() |
| 686 | */ |
| 687 | if (remove) |
| 688 | cmd->se_tfo->aborted_task(cmd); |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 689 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 690 | if (transport_cmd_check_stop_to_fabric(cmd)) |
Nicholas Bellinger | 1f576d5 | 2017-06-02 20:00:17 -0700 | [diff] [blame] | 691 | return 1; |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 692 | if (remove && ack_kref) |
Nicholas Bellinger | 1f576d5 | 2017-06-02 20:00:17 -0700 | [diff] [blame] | 693 | ret = transport_put_cmd(cmd); |
| 694 | |
| 695 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 696 | } |
| 697 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 698 | static void target_complete_failure_work(struct work_struct *work) |
| 699 | { |
| 700 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
| 701 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 702 | transport_generic_request_failure(cmd, |
| 703 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 704 | } |
| 705 | |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 706 | /* |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 707 | * Used when asking transport to copy Sense Data from the underlying |
| 708 | * Linux/SCSI struct scsi_cmnd |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 709 | */ |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 710 | static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 711 | { |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 712 | struct se_device *dev = cmd->se_dev; |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 713 | |
| 714 | WARN_ON(!cmd->se_lun); |
| 715 | |
| 716 | if (!dev) |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 717 | return NULL; |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 718 | |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 719 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) |
| 720 | return NULL; |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 721 | |
Roland Dreier | 9c58b7d | 2012-08-15 14:35:25 -0700 | [diff] [blame] | 722 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 723 | |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 724 | pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 725 | dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); |
Roland Dreier | 9c58b7d | 2012-08-15 14:35:25 -0700 | [diff] [blame] | 726 | return cmd->sense_buffer; |
Paolo Bonzini | 6138ed2 | 2012-09-05 17:09:13 +0200 | [diff] [blame] | 727 | } |
| 728 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 729 | void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 730 | { |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 731 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 732 | int success = scsi_status == GOOD; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 733 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 734 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 735 | cmd->scsi_status = scsi_status; |
| 736 | |
| 737 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 738 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 739 | cmd->transport_state &= ~CMD_T_BUSY; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 740 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 741 | if (dev && dev->transport->transport_complete) { |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 742 | dev->transport->transport_complete(cmd, |
| 743 | cmd->t_data_sg, |
| 744 | transport_get_sense_buffer(cmd)); |
| 745 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 746 | success = 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | /* |
Hannes Reinecke | 125d011 | 2013-11-19 09:07:46 +0100 | [diff] [blame] | 750 | * Check for case where an explicit ABORT_TASK has been received |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame] | 751 | * and transport_wait_for_tasks() will be waiting for completion.. |
| 752 | */ |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 753 | if (cmd->transport_state & CMD_T_ABORTED || |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame] | 754 | cmd->transport_state & CMD_T_STOP) { |
| 755 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Jiang Yi | 672145d | 2017-06-25 12:28:50 -0700 | [diff] [blame] | 756 | /* |
| 757 | * If COMPARE_AND_WRITE was stopped by __transport_wait_for_tasks(), |
| 758 | * release se_device->caw_sem obtained by sbc_compare_and_write() |
| 759 | * since target_complete_ok_work() or target_complete_failure_work() |
| 760 | * won't be called to invoke the normal CAW completion callbacks. |
| 761 | */ |
| 762 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { |
| 763 | up(&dev->caw_sem); |
| 764 | } |
Nicholas Bellinger | a95d651 | 2014-06-09 23:36:51 +0000 | [diff] [blame] | 765 | complete_all(&cmd->t_transport_stop_comp); |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame] | 766 | return; |
Roland Dreier | 3dca147 | 2014-02-03 14:08:26 -0800 | [diff] [blame] | 767 | } else if (!success) { |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 768 | INIT_WORK(&cmd->work, target_complete_failure_work); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 769 | } else { |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 770 | INIT_WORK(&cmd->work, target_complete_ok_work); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 771 | } |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 772 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 773 | cmd->t_state = TRANSPORT_COMPLETE; |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame] | 774 | cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 775 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 776 | |
Quinn Tran | 9095ada | 2016-02-10 18:59:13 -0500 | [diff] [blame] | 777 | if (cmd->se_cmd_flags & SCF_USE_CPUID) |
Quinn Tran | fb3269b | 2015-12-17 14:57:06 -0500 | [diff] [blame] | 778 | queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work); |
Quinn Tran | 9095ada | 2016-02-10 18:59:13 -0500 | [diff] [blame] | 779 | else |
| 780 | queue_work(target_completion_wq, &cmd->work); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 781 | } |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame] | 782 | EXPORT_SYMBOL(target_complete_cmd); |
| 783 | |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 784 | void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) |
| 785 | { |
Nicholas Bellinger | 61f3616 | 2016-10-16 00:27:42 -0700 | [diff] [blame] | 786 | if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 787 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
| 788 | cmd->residual_count += cmd->data_length - length; |
| 789 | } else { |
| 790 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; |
| 791 | cmd->residual_count = cmd->data_length - length; |
| 792 | } |
| 793 | |
| 794 | cmd->data_length = length; |
| 795 | } |
| 796 | |
| 797 | target_complete_cmd(cmd, scsi_status); |
| 798 | } |
| 799 | EXPORT_SYMBOL(target_complete_cmd_with_length); |
| 800 | |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 801 | static void target_add_to_state_list(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 802 | { |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 803 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 804 | unsigned long flags; |
| 805 | |
Nicholas Bellinger | 4d2300c | 2011-11-30 18:18:33 -0800 | [diff] [blame] | 806 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 807 | if (!cmd->state_active) { |
| 808 | list_add_tail(&cmd->state_list, &dev->state_list); |
| 809 | cmd->state_active = true; |
| 810 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 811 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 812 | } |
| 813 | |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 814 | /* |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 815 | * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 816 | */ |
Christoph Hellwig | 7a6f0a1 | 2012-07-08 15:58:47 -0400 | [diff] [blame] | 817 | static void transport_write_pending_qf(struct se_cmd *cmd); |
| 818 | static void transport_complete_qf(struct se_cmd *cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 819 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 820 | void target_qf_do_work(struct work_struct *work) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 821 | { |
| 822 | struct se_device *dev = container_of(work, struct se_device, |
| 823 | qf_work_queue); |
Roland Dreier | bcac364 | 2011-08-27 21:33:16 -0700 | [diff] [blame] | 824 | LIST_HEAD(qf_cmd_list); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 825 | struct se_cmd *cmd, *cmd_tmp; |
| 826 | |
| 827 | spin_lock_irq(&dev->qf_cmd_lock); |
Roland Dreier | bcac364 | 2011-08-27 21:33:16 -0700 | [diff] [blame] | 828 | list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); |
| 829 | spin_unlock_irq(&dev->qf_cmd_lock); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 830 | |
Roland Dreier | bcac364 | 2011-08-27 21:33:16 -0700 | [diff] [blame] | 831 | list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 832 | list_del(&cmd->se_qf_node); |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 833 | atomic_dec_mb(&dev->dev_qf_count); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 834 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 835 | pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 836 | " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 837 | (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 838 | (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" |
| 839 | : "UNKNOWN"); |
Christoph Hellwig | f7a5cc0 | 2011-10-17 13:56:42 -0400 | [diff] [blame] | 840 | |
Christoph Hellwig | 7a6f0a1 | 2012-07-08 15:58:47 -0400 | [diff] [blame] | 841 | if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) |
| 842 | transport_write_pending_qf(cmd); |
| 843 | else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) |
| 844 | transport_complete_qf(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 845 | } |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 846 | } |
| 847 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 848 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
| 849 | { |
| 850 | switch (cmd->data_direction) { |
| 851 | case DMA_NONE: |
| 852 | return "NONE"; |
| 853 | case DMA_FROM_DEVICE: |
| 854 | return "READ"; |
| 855 | case DMA_TO_DEVICE: |
| 856 | return "WRITE"; |
| 857 | case DMA_BIDIRECTIONAL: |
| 858 | return "BIDI"; |
| 859 | default: |
| 860 | break; |
| 861 | } |
| 862 | |
| 863 | return "UNKNOWN"; |
| 864 | } |
| 865 | |
| 866 | void transport_dump_dev_state( |
| 867 | struct se_device *dev, |
| 868 | char *b, |
| 869 | int *bl) |
| 870 | { |
| 871 | *bl += sprintf(b + *bl, "Status: "); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 872 | if (dev->export_count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 873 | *bl += sprintf(b + *bl, "ACTIVATED"); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 874 | else |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 875 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 876 | |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 877 | *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); |
Nicholas Bellinger | 11e764b | 2012-05-09 12:42:09 -0700 | [diff] [blame] | 878 | *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 879 | dev->dev_attrib.block_size, |
| 880 | dev->dev_attrib.hw_max_sectors); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 881 | *bl += sprintf(b + *bl, " "); |
| 882 | } |
| 883 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 884 | void transport_dump_vpd_proto_id( |
| 885 | struct t10_vpd *vpd, |
| 886 | unsigned char *p_buf, |
| 887 | int p_buf_len) |
| 888 | { |
| 889 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 890 | int len; |
| 891 | |
| 892 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 893 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); |
| 894 | |
| 895 | switch (vpd->protocol_identifier) { |
| 896 | case 0x00: |
| 897 | sprintf(buf+len, "Fibre Channel\n"); |
| 898 | break; |
| 899 | case 0x10: |
| 900 | sprintf(buf+len, "Parallel SCSI\n"); |
| 901 | break; |
| 902 | case 0x20: |
| 903 | sprintf(buf+len, "SSA\n"); |
| 904 | break; |
| 905 | case 0x30: |
| 906 | sprintf(buf+len, "IEEE 1394\n"); |
| 907 | break; |
| 908 | case 0x40: |
| 909 | sprintf(buf+len, "SCSI Remote Direct Memory Access" |
| 910 | " Protocol\n"); |
| 911 | break; |
| 912 | case 0x50: |
| 913 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); |
| 914 | break; |
| 915 | case 0x60: |
| 916 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); |
| 917 | break; |
| 918 | case 0x70: |
| 919 | sprintf(buf+len, "Automation/Drive Interface Transport" |
| 920 | " Protocol\n"); |
| 921 | break; |
| 922 | case 0x80: |
| 923 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); |
| 924 | break; |
| 925 | default: |
| 926 | sprintf(buf+len, "Unknown 0x%02x\n", |
| 927 | vpd->protocol_identifier); |
| 928 | break; |
| 929 | } |
| 930 | |
| 931 | if (p_buf) |
| 932 | strncpy(p_buf, buf, p_buf_len); |
| 933 | else |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 934 | pr_debug("%s", buf); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 935 | } |
| 936 | |
| 937 | void |
| 938 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) |
| 939 | { |
| 940 | /* |
| 941 | * Check if the Protocol Identifier Valid (PIV) bit is set.. |
| 942 | * |
| 943 | * from spc3r23.pdf section 7.5.1 |
| 944 | */ |
| 945 | if (page_83[1] & 0x80) { |
| 946 | vpd->protocol_identifier = (page_83[0] & 0xf0); |
| 947 | vpd->protocol_identifier_set = 1; |
| 948 | transport_dump_vpd_proto_id(vpd, NULL, 0); |
| 949 | } |
| 950 | } |
| 951 | EXPORT_SYMBOL(transport_set_vpd_proto_id); |
| 952 | |
| 953 | int transport_dump_vpd_assoc( |
| 954 | struct t10_vpd *vpd, |
| 955 | unsigned char *p_buf, |
| 956 | int p_buf_len) |
| 957 | { |
| 958 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 959 | int ret = 0; |
| 960 | int len; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 961 | |
| 962 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 963 | len = sprintf(buf, "T10 VPD Identifier Association: "); |
| 964 | |
| 965 | switch (vpd->association) { |
| 966 | case 0x00: |
| 967 | sprintf(buf+len, "addressed logical unit\n"); |
| 968 | break; |
| 969 | case 0x10: |
| 970 | sprintf(buf+len, "target port\n"); |
| 971 | break; |
| 972 | case 0x20: |
| 973 | sprintf(buf+len, "SCSI target device\n"); |
| 974 | break; |
| 975 | default: |
| 976 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 977 | ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 978 | break; |
| 979 | } |
| 980 | |
| 981 | if (p_buf) |
| 982 | strncpy(p_buf, buf, p_buf_len); |
| 983 | else |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 984 | pr_debug("%s", buf); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 985 | |
| 986 | return ret; |
| 987 | } |
| 988 | |
| 989 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) |
| 990 | { |
| 991 | /* |
| 992 | * The VPD identification association.. |
| 993 | * |
| 994 | * from spc3r23.pdf Section 7.6.3.1 Table 297 |
| 995 | */ |
| 996 | vpd->association = (page_83[1] & 0x30); |
| 997 | return transport_dump_vpd_assoc(vpd, NULL, 0); |
| 998 | } |
| 999 | EXPORT_SYMBOL(transport_set_vpd_assoc); |
| 1000 | |
| 1001 | int transport_dump_vpd_ident_type( |
| 1002 | struct t10_vpd *vpd, |
| 1003 | unsigned char *p_buf, |
| 1004 | int p_buf_len) |
| 1005 | { |
| 1006 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1007 | int ret = 0; |
| 1008 | int len; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1009 | |
| 1010 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1011 | len = sprintf(buf, "T10 VPD Identifier Type: "); |
| 1012 | |
| 1013 | switch (vpd->device_identifier_type) { |
| 1014 | case 0x00: |
| 1015 | sprintf(buf+len, "Vendor specific\n"); |
| 1016 | break; |
| 1017 | case 0x01: |
| 1018 | sprintf(buf+len, "T10 Vendor ID based\n"); |
| 1019 | break; |
| 1020 | case 0x02: |
| 1021 | sprintf(buf+len, "EUI-64 based\n"); |
| 1022 | break; |
| 1023 | case 0x03: |
| 1024 | sprintf(buf+len, "NAA\n"); |
| 1025 | break; |
| 1026 | case 0x04: |
| 1027 | sprintf(buf+len, "Relative target port identifier\n"); |
| 1028 | break; |
| 1029 | case 0x08: |
| 1030 | sprintf(buf+len, "SCSI name string\n"); |
| 1031 | break; |
| 1032 | default: |
| 1033 | sprintf(buf+len, "Unsupported: 0x%02x\n", |
| 1034 | vpd->device_identifier_type); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1035 | ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1036 | break; |
| 1037 | } |
| 1038 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1039 | if (p_buf) { |
| 1040 | if (p_buf_len < strlen(buf)+1) |
| 1041 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1042 | strncpy(p_buf, buf, p_buf_len); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1043 | } else { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1044 | pr_debug("%s", buf); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1045 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1046 | |
| 1047 | return ret; |
| 1048 | } |
| 1049 | |
| 1050 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) |
| 1051 | { |
| 1052 | /* |
| 1053 | * The VPD identifier type.. |
| 1054 | * |
| 1055 | * from spc3r23.pdf Section 7.6.3.1 Table 298 |
| 1056 | */ |
| 1057 | vpd->device_identifier_type = (page_83[1] & 0x0f); |
| 1058 | return transport_dump_vpd_ident_type(vpd, NULL, 0); |
| 1059 | } |
| 1060 | EXPORT_SYMBOL(transport_set_vpd_ident_type); |
| 1061 | |
| 1062 | int transport_dump_vpd_ident( |
| 1063 | struct t10_vpd *vpd, |
| 1064 | unsigned char *p_buf, |
| 1065 | int p_buf_len) |
| 1066 | { |
| 1067 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 1068 | int ret = 0; |
| 1069 | |
| 1070 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1071 | |
| 1072 | switch (vpd->device_identifier_code_set) { |
| 1073 | case 0x01: /* Binary */ |
Dan Carpenter | 703d641 | 2013-01-18 16:05:12 +0300 | [diff] [blame] | 1074 | snprintf(buf, sizeof(buf), |
| 1075 | "T10 VPD Binary Device Identifier: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1076 | &vpd->device_identifier[0]); |
| 1077 | break; |
| 1078 | case 0x02: /* ASCII */ |
Dan Carpenter | 703d641 | 2013-01-18 16:05:12 +0300 | [diff] [blame] | 1079 | snprintf(buf, sizeof(buf), |
| 1080 | "T10 VPD ASCII Device Identifier: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1081 | &vpd->device_identifier[0]); |
| 1082 | break; |
| 1083 | case 0x03: /* UTF-8 */ |
Dan Carpenter | 703d641 | 2013-01-18 16:05:12 +0300 | [diff] [blame] | 1084 | snprintf(buf, sizeof(buf), |
| 1085 | "T10 VPD UTF-8 Device Identifier: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1086 | &vpd->device_identifier[0]); |
| 1087 | break; |
| 1088 | default: |
| 1089 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" |
| 1090 | " 0x%02x", vpd->device_identifier_code_set); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1091 | ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1092 | break; |
| 1093 | } |
| 1094 | |
| 1095 | if (p_buf) |
| 1096 | strncpy(p_buf, buf, p_buf_len); |
| 1097 | else |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1098 | pr_debug("%s", buf); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1099 | |
| 1100 | return ret; |
| 1101 | } |
| 1102 | |
| 1103 | int |
| 1104 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) |
| 1105 | { |
| 1106 | static const char hex_str[] = "0123456789abcdef"; |
Masanari Iida | 35d1efe | 2012-08-16 22:43:13 +0900 | [diff] [blame] | 1107 | int j = 0, i = 4; /* offset to start of the identifier */ |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1108 | |
| 1109 | /* |
| 1110 | * The VPD Code Set (encoding) |
| 1111 | * |
| 1112 | * from spc3r23.pdf Section 7.6.3.1 Table 296 |
| 1113 | */ |
| 1114 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); |
| 1115 | switch (vpd->device_identifier_code_set) { |
| 1116 | case 0x01: /* Binary */ |
| 1117 | vpd->device_identifier[j++] = |
| 1118 | hex_str[vpd->device_identifier_type]; |
| 1119 | while (i < (4 + page_83[3])) { |
| 1120 | vpd->device_identifier[j++] = |
| 1121 | hex_str[(page_83[i] & 0xf0) >> 4]; |
| 1122 | vpd->device_identifier[j++] = |
| 1123 | hex_str[page_83[i] & 0x0f]; |
| 1124 | i++; |
| 1125 | } |
| 1126 | break; |
| 1127 | case 0x02: /* ASCII */ |
| 1128 | case 0x03: /* UTF-8 */ |
| 1129 | while (i < (4 + page_83[3])) |
| 1130 | vpd->device_identifier[j++] = page_83[i++]; |
| 1131 | break; |
| 1132 | default: |
| 1133 | break; |
| 1134 | } |
| 1135 | |
| 1136 | return transport_dump_vpd_ident(vpd, NULL, 0); |
| 1137 | } |
| 1138 | EXPORT_SYMBOL(transport_set_vpd_ident); |
| 1139 | |
Nicholas Bellinger | 8f9b565 | 2015-07-30 18:28:13 -0700 | [diff] [blame] | 1140 | static sense_reason_t |
| 1141 | target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev, |
| 1142 | unsigned int size) |
| 1143 | { |
| 1144 | u32 mtl; |
| 1145 | |
| 1146 | if (!cmd->se_tfo->max_data_sg_nents) |
| 1147 | return TCM_NO_SENSE; |
| 1148 | /* |
| 1149 | * Check if fabric enforced maximum SGL entries per I/O descriptor |
| 1150 | * exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT + |
| 1151 | * residual_count and reduce original cmd->data_length to maximum |
| 1152 | * length based on single PAGE_SIZE entry scatter-lists. |
| 1153 | */ |
| 1154 | mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE); |
| 1155 | if (cmd->data_length > mtl) { |
| 1156 | /* |
| 1157 | * If an existing CDB overflow is present, calculate new residual |
| 1158 | * based on CDB size minus fabric maximum transfer length. |
| 1159 | * |
| 1160 | * If an existing CDB underflow is present, calculate new residual |
| 1161 | * based on original cmd->data_length minus fabric maximum transfer |
| 1162 | * length. |
| 1163 | * |
| 1164 | * Otherwise, set the underflow residual based on cmd->data_length |
| 1165 | * minus fabric maximum transfer length. |
| 1166 | */ |
| 1167 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { |
| 1168 | cmd->residual_count = (size - mtl); |
| 1169 | } else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
| 1170 | u32 orig_dl = size + cmd->residual_count; |
| 1171 | cmd->residual_count = (orig_dl - mtl); |
| 1172 | } else { |
| 1173 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; |
| 1174 | cmd->residual_count = (cmd->data_length - mtl); |
| 1175 | } |
| 1176 | cmd->data_length = mtl; |
| 1177 | /* |
| 1178 | * Reset sbc_check_prot() calculated protection payload |
| 1179 | * length based upon the new smaller MTL. |
| 1180 | */ |
| 1181 | if (cmd->prot_length) { |
| 1182 | u32 sectors = (mtl / dev->dev_attrib.block_size); |
| 1183 | cmd->prot_length = dev->prot_length * sectors; |
| 1184 | } |
| 1185 | } |
| 1186 | return TCM_NO_SENSE; |
| 1187 | } |
| 1188 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1189 | sense_reason_t |
| 1190 | target_cmd_size_check(struct se_cmd *cmd, unsigned int size) |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1191 | { |
| 1192 | struct se_device *dev = cmd->se_dev; |
| 1193 | |
| 1194 | if (cmd->unknown_data_length) { |
| 1195 | cmd->data_length = size; |
| 1196 | } else if (size != cmd->data_length) { |
Nicholas Bellinger | 974a4eb | 2017-05-11 01:07:24 -0700 | [diff] [blame] | 1197 | pr_warn_ratelimited("TARGET_CORE[%s]: Expected Transfer Length:" |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1198 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
| 1199 | " 0x%02x\n", cmd->se_tfo->get_fabric_name(), |
| 1200 | cmd->data_length, size, cmd->t_task_cdb[0]); |
| 1201 | |
Nicholas Bellinger | 974a4eb | 2017-05-11 01:07:24 -0700 | [diff] [blame] | 1202 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 1203 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
| 1204 | pr_err_ratelimited("Rejecting underflow/overflow" |
| 1205 | " for WRITE data CDB\n"); |
| 1206 | return TCM_INVALID_CDB_FIELD; |
| 1207 | } |
| 1208 | /* |
| 1209 | * Some fabric drivers like iscsi-target still expect to |
| 1210 | * always reject overflow writes. Reject this case until |
| 1211 | * full fabric driver level support for overflow writes |
| 1212 | * is introduced tree-wide. |
| 1213 | */ |
| 1214 | if (size > cmd->data_length) { |
| 1215 | pr_err_ratelimited("Rejecting overflow for" |
| 1216 | " WRITE control CDB\n"); |
| 1217 | return TCM_INVALID_CDB_FIELD; |
| 1218 | } |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1219 | } |
| 1220 | /* |
| 1221 | * Reject READ_* or WRITE_* with overflow/underflow for |
| 1222 | * type SCF_SCSI_DATA_CDB. |
| 1223 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1224 | if (dev->dev_attrib.block_size != 512) { |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1225 | pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" |
| 1226 | " CDB on non 512-byte sector setup subsystem" |
| 1227 | " plugin: %s\n", dev->transport->name); |
| 1228 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1229 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1230 | } |
Nicholas Bellinger | 4c054ba | 2012-08-16 15:33:10 -0700 | [diff] [blame] | 1231 | /* |
| 1232 | * For the overflow case keep the existing fabric provided |
| 1233 | * ->data_length. Otherwise for the underflow case, reset |
| 1234 | * ->data_length to the smaller SCSI expected data transfer |
| 1235 | * length. |
| 1236 | */ |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1237 | if (size > cmd->data_length) { |
| 1238 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; |
| 1239 | cmd->residual_count = (size - cmd->data_length); |
| 1240 | } else { |
| 1241 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; |
| 1242 | cmd->residual_count = (cmd->data_length - size); |
Nicholas Bellinger | 4c054ba | 2012-08-16 15:33:10 -0700 | [diff] [blame] | 1243 | cmd->data_length = size; |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1244 | } |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1245 | } |
| 1246 | |
Nicholas Bellinger | 8f9b565 | 2015-07-30 18:28:13 -0700 | [diff] [blame] | 1247 | return target_check_max_data_sg_nents(cmd, dev, size); |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1248 | |
Christoph Hellwig | 9b3b804 | 2012-05-20 11:59:12 -0400 | [diff] [blame] | 1249 | } |
| 1250 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1251 | /* |
| 1252 | * Used by fabric modules containing a local struct se_cmd within their |
| 1253 | * fabric dependent per I/O descriptor. |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 1254 | * |
| 1255 | * Preserves the value of @cmd->tag. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1256 | */ |
| 1257 | void transport_init_se_cmd( |
| 1258 | struct se_cmd *cmd, |
Christoph Hellwig | 9ac8928 | 2015-04-08 20:01:35 +0200 | [diff] [blame] | 1259 | const struct target_core_fabric_ops *tfo, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1260 | struct se_session *se_sess, |
| 1261 | u32 data_length, |
| 1262 | int data_direction, |
| 1263 | int task_attr, |
| 1264 | unsigned char *sense_buffer) |
| 1265 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 1266 | INIT_LIST_HEAD(&cmd->se_delayed_node); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 1267 | INIT_LIST_HEAD(&cmd->se_qf_node); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 1268 | INIT_LIST_HEAD(&cmd->se_cmd_list); |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 1269 | INIT_LIST_HEAD(&cmd->state_list); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1270 | init_completion(&cmd->t_transport_stop_comp); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 1271 | init_completion(&cmd->cmd_wait_comp); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1272 | spin_lock_init(&cmd->t_state_lock); |
Mikulas Patocka | 1e1110c | 2014-05-17 06:49:22 -0400 | [diff] [blame] | 1273 | kref_init(&cmd->cmd_kref); |
Christoph Hellwig | 7d680f3b | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 1274 | cmd->transport_state = CMD_T_DEV_ACTIVE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1275 | |
| 1276 | cmd->se_tfo = tfo; |
| 1277 | cmd->se_sess = se_sess; |
| 1278 | cmd->data_length = data_length; |
| 1279 | cmd->data_direction = data_direction; |
| 1280 | cmd->sam_task_attr = task_attr; |
| 1281 | cmd->sense_buffer = sense_buffer; |
Christoph Hellwig | cf572a9 | 2012-04-24 00:25:05 -0400 | [diff] [blame] | 1282 | |
| 1283 | cmd->state_active = false; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1284 | } |
| 1285 | EXPORT_SYMBOL(transport_init_se_cmd); |
| 1286 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1287 | static sense_reason_t |
| 1288 | transport_check_alloc_task_attr(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1289 | { |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1290 | struct se_device *dev = cmd->se_dev; |
| 1291 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1292 | /* |
| 1293 | * Check if SAM Task Attribute emulation is enabled for this |
| 1294 | * struct se_device storage object |
| 1295 | */ |
Andy Grover | a354170 | 2015-05-19 14:44:41 -0700 | [diff] [blame] | 1296 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1297 | return 0; |
| 1298 | |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 1299 | if (cmd->sam_task_attr == TCM_ACA_TAG) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1300 | pr_debug("SAM Task Attribute ACA" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1301 | " emulation is not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1302 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1303 | } |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 1304 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1305 | return 0; |
| 1306 | } |
| 1307 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1308 | sense_reason_t |
| 1309 | target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1310 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1311 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1312 | sense_reason_t ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1313 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1314 | /* |
| 1315 | * Ensure that the received CDB is less than the max (252 + 8) bytes |
| 1316 | * for VARIABLE_LENGTH_CMD |
| 1317 | */ |
| 1318 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1319 | pr_err("Received SCSI CDB with command_size: %d that" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1320 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
| 1321 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1322 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1323 | } |
| 1324 | /* |
| 1325 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, |
| 1326 | * allocate the additional extended CDB buffer now.. Otherwise |
| 1327 | * setup the pointer from __t_task_cdb to t_task_cdb. |
| 1328 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1329 | if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { |
| 1330 | cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1331 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1332 | if (!cmd->t_task_cdb) { |
| 1333 | pr_err("Unable to allocate cmd->t_task_cdb" |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1334 | " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1335 | scsi_command_size(cdb), |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1336 | (unsigned long)sizeof(cmd->__t_task_cdb)); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1337 | return TCM_OUT_OF_RESOURCES; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1338 | } |
| 1339 | } else |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1340 | cmd->t_task_cdb = &cmd->__t_task_cdb[0]; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1341 | /* |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1342 | * Copy the original CDB into cmd-> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1343 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 1344 | memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); |
Christoph Hellwig | cb4f4d3 | 2012-05-20 11:59:10 -0400 | [diff] [blame] | 1345 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 1346 | trace_target_sequencer_start(cmd); |
| 1347 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1348 | ret = dev->transport->parse_cdb(cmd); |
Joern Engel | 568e1f6 | 2015-07-22 15:01:36 -0700 | [diff] [blame] | 1349 | if (ret == TCM_UNSUPPORTED_SCSI_OPCODE) |
| 1350 | pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n", |
| 1351 | cmd->se_tfo->get_fabric_name(), |
| 1352 | cmd->se_sess->se_node_acl->initiatorname, |
| 1353 | cmd->t_task_cdb[0]); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1354 | if (ret) |
| 1355 | return ret; |
Christoph Hellwig | cb4f4d3 | 2012-05-20 11:59:10 -0400 | [diff] [blame] | 1356 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1357 | ret = transport_check_alloc_task_attr(cmd); |
| 1358 | if (ret) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1359 | return ret; |
Christoph Hellwig | cb4f4d3 | 2012-05-20 11:59:10 -0400 | [diff] [blame] | 1360 | |
Christoph Hellwig | cb4f4d3 | 2012-05-20 11:59:10 -0400 | [diff] [blame] | 1361 | cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 1362 | atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1363 | return 0; |
| 1364 | } |
Andy Grover | a12f41f | 2012-04-03 15:51:20 -0700 | [diff] [blame] | 1365 | EXPORT_SYMBOL(target_setup_cmd_from_cdb); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1366 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1367 | /* |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1368 | * Used by fabric module frontends to queue tasks directly. |
Bart Van Assche | ac75d8b | 2015-10-22 15:52:01 -0700 | [diff] [blame] | 1369 | * May only be used from process context. |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1370 | */ |
| 1371 | int transport_handle_cdb_direct( |
| 1372 | struct se_cmd *cmd) |
| 1373 | { |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1374 | sense_reason_t ret; |
Nicholas Bellinger | dd8ae59 | 2011-07-30 05:03:58 -0700 | [diff] [blame] | 1375 | |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1376 | if (!cmd->se_lun) { |
| 1377 | dump_stack(); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1378 | pr_err("cmd->se_lun is NULL\n"); |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1379 | return -EINVAL; |
| 1380 | } |
| 1381 | if (in_interrupt()) { |
| 1382 | dump_stack(); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1383 | pr_err("transport_generic_handle_cdb cannot be called" |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1384 | " from interrupt context\n"); |
| 1385 | return -EINVAL; |
| 1386 | } |
Nicholas Bellinger | dd8ae59 | 2011-07-30 05:03:58 -0700 | [diff] [blame] | 1387 | /* |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 1388 | * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that |
| 1389 | * outstanding descriptors are handled correctly during shutdown via |
| 1390 | * transport_wait_for_tasks() |
Nicholas Bellinger | dd8ae59 | 2011-07-30 05:03:58 -0700 | [diff] [blame] | 1391 | * |
| 1392 | * Also, we don't take cmd->t_state_lock here as we only expect |
| 1393 | * this to be called for initial descriptor submission. |
| 1394 | */ |
| 1395 | cmd->t_state = TRANSPORT_NEW_CMD; |
Christoph Hellwig | 7d680f3b | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 1396 | cmd->transport_state |= CMD_T_ACTIVE; |
| 1397 | |
Nicholas Bellinger | dd8ae59 | 2011-07-30 05:03:58 -0700 | [diff] [blame] | 1398 | /* |
| 1399 | * transport_generic_new_cmd() is already handling QUEUE_FULL, |
| 1400 | * so follow TRANSPORT_NEW_CMD processing thread context usage |
| 1401 | * and call transport_generic_request_failure() if necessary.. |
| 1402 | */ |
| 1403 | ret = transport_generic_new_cmd(cmd); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1404 | if (ret) |
| 1405 | transport_generic_request_failure(cmd, ret); |
Nicholas Bellinger | dd8ae59 | 2011-07-30 05:03:58 -0700 | [diff] [blame] | 1406 | return 0; |
Nicholas Bellinger | 695434e1 | 2011-06-03 20:59:19 -0700 | [diff] [blame] | 1407 | } |
| 1408 | EXPORT_SYMBOL(transport_handle_cdb_direct); |
| 1409 | |
Nicholas Bellinger | c5ff8d6 | 2013-08-22 11:58:43 -0700 | [diff] [blame] | 1410 | sense_reason_t |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1411 | transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
| 1412 | u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) |
| 1413 | { |
| 1414 | if (!sgl || !sgl_count) |
| 1415 | return 0; |
| 1416 | |
| 1417 | /* |
| 1418 | * Reject SCSI data overflow with map_mem_to_cmd() as incoming |
| 1419 | * scatterlists already have been set to follow what the fabric |
| 1420 | * passes for the original expected data transfer length. |
| 1421 | */ |
| 1422 | if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { |
| 1423 | pr_warn("Rejecting SCSI DATA overflow for fabric using" |
| 1424 | " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); |
| 1425 | return TCM_INVALID_CDB_FIELD; |
| 1426 | } |
| 1427 | |
| 1428 | cmd->t_data_sg = sgl; |
| 1429 | cmd->t_data_nents = sgl_count; |
Ilias Tsitsimpis | b32bd0a | 2015-04-23 21:30:07 +0300 | [diff] [blame] | 1430 | cmd->t_bidi_data_sg = sgl_bidi; |
| 1431 | cmd->t_bidi_data_nents = sgl_bidi_count; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1432 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1433 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| 1434 | return 0; |
| 1435 | } |
| 1436 | |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1437 | /* |
| 1438 | * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized |
| 1439 | * se_cmd + use pre-allocated SGL memory. |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1440 | * |
| 1441 | * @se_cmd: command descriptor to submit |
| 1442 | * @se_sess: associated se_sess for endpoint |
| 1443 | * @cdb: pointer to SCSI CDB |
| 1444 | * @sense: pointer to SCSI sense buffer |
| 1445 | * @unpacked_lun: unpacked LUN to reference for struct se_lun |
| 1446 | * @data_length: fabric expected data transfer length |
| 1447 | * @task_addr: SAM task attribute |
| 1448 | * @data_dir: DMA data direction |
| 1449 | * @flags: flags for command submission from target_sc_flags_tables |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1450 | * @sgl: struct scatterlist memory for unidirectional mapping |
| 1451 | * @sgl_count: scatterlist count for unidirectional mapping |
| 1452 | * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping |
| 1453 | * @sgl_bidi_count: scatterlist count for bidirectional READ mapping |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1454 | * @sgl_prot: struct scatterlist memory protection information |
| 1455 | * @sgl_prot_count: scatterlist count for protection information |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1456 | * |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 1457 | * Task tags are supported if the caller has set @se_cmd->tag. |
| 1458 | * |
Roland Dreier | d6dfc86 | 2012-07-16 11:04:39 -0700 | [diff] [blame] | 1459 | * Returns non zero to signal active I/O shutdown failure. All other |
| 1460 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, |
| 1461 | * but still return zero here. |
| 1462 | * |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1463 | * This may only be called from process context, and also currently |
| 1464 | * assumes internal allocation of fabric payload buffer by target-core. |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1465 | */ |
| 1466 | int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, |
Hannes Reinecke | f2d3068 | 2015-06-10 08:41:22 +0200 | [diff] [blame] | 1467 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1468 | u32 data_length, int task_attr, int data_dir, int flags, |
| 1469 | struct scatterlist *sgl, u32 sgl_count, |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1470 | struct scatterlist *sgl_bidi, u32 sgl_bidi_count, |
| 1471 | struct scatterlist *sgl_prot, u32 sgl_prot_count) |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1472 | { |
| 1473 | struct se_portal_group *se_tpg; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1474 | sense_reason_t rc; |
| 1475 | int ret; |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1476 | |
| 1477 | se_tpg = se_sess->se_tpg; |
| 1478 | BUG_ON(!se_tpg); |
| 1479 | BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); |
| 1480 | BUG_ON(in_interrupt()); |
| 1481 | /* |
| 1482 | * Initialize se_cmd for target operation. From this point |
| 1483 | * exceptions are handled by sending exception status via |
| 1484 | * target_core_fabric_ops->queue_status() callback |
| 1485 | */ |
| 1486 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, |
| 1487 | data_length, data_dir, task_attr, sense); |
Quinn Tran | 9095ada | 2016-02-10 18:59:13 -0500 | [diff] [blame] | 1488 | |
| 1489 | if (flags & TARGET_SCF_USE_CPUID) |
| 1490 | se_cmd->se_cmd_flags |= SCF_USE_CPUID; |
| 1491 | else |
| 1492 | se_cmd->cpuid = WORK_CPU_UNBOUND; |
| 1493 | |
Sebastian Andrzej Siewior | b0d7994 | 2012-01-10 14:16:59 +0100 | [diff] [blame] | 1494 | if (flags & TARGET_SCF_UNKNOWN_SIZE) |
| 1495 | se_cmd->unknown_data_length = 1; |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1496 | /* |
| 1497 | * Obtain struct se_cmd->cmd_kref reference and add new cmd to |
| 1498 | * se_sess->sess_cmd_list. A second kref_get here is necessary |
| 1499 | * for fabrics using TARGET_SCF_ACK_KREF that expect a second |
| 1500 | * kref_put() to happen during fabric packet acknowledgement. |
| 1501 | */ |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 1502 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1503 | if (ret) |
| 1504 | return ret; |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1505 | /* |
| 1506 | * Signal bidirectional data payloads to target-core |
| 1507 | */ |
| 1508 | if (flags & TARGET_SCF_BIDI_OP) |
| 1509 | se_cmd->se_cmd_flags |= SCF_BIDI; |
| 1510 | /* |
| 1511 | * Locate se_lun pointer and attach it to struct se_cmd |
| 1512 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1513 | rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); |
| 1514 | if (rc) { |
| 1515 | transport_send_check_condition_and_sense(se_cmd, rc, 0); |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 1516 | target_put_sess_cmd(se_cmd); |
Roland Dreier | d6dfc86 | 2012-07-16 11:04:39 -0700 | [diff] [blame] | 1517 | return 0; |
Nicholas Bellinger | 735703c | 2012-01-20 19:02:56 -0800 | [diff] [blame] | 1518 | } |
Sagi Grimberg | b5b8e29 | 2014-02-19 17:50:17 +0200 | [diff] [blame] | 1519 | |
| 1520 | rc = target_setup_cmd_from_cdb(se_cmd, cdb); |
| 1521 | if (rc != 0) { |
| 1522 | transport_generic_request_failure(se_cmd, rc); |
| 1523 | return 0; |
| 1524 | } |
| 1525 | |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1526 | /* |
| 1527 | * Save pointers for SGLs containing protection information, |
| 1528 | * if present. |
| 1529 | */ |
| 1530 | if (sgl_prot_count) { |
| 1531 | se_cmd->t_prot_sg = sgl_prot; |
| 1532 | se_cmd->t_prot_nents = sgl_prot_count; |
Akinobu Mita | 5835812 | 2015-05-01 15:23:49 +0900 | [diff] [blame] | 1533 | se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC; |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1534 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1535 | |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1536 | /* |
| 1537 | * When a non zero sgl_count has been passed perform SGL passthrough |
| 1538 | * mapping for pre-allocated fabric memory instead of having target |
| 1539 | * core perform an internal SGL allocation.. |
| 1540 | */ |
| 1541 | if (sgl_count != 0) { |
| 1542 | BUG_ON(!sgl); |
Andy Grover | 11e319e | 2012-04-03 15:51:28 -0700 | [diff] [blame] | 1543 | |
Nicholas Bellinger | 944981c | 2012-10-02 14:00:33 -0700 | [diff] [blame] | 1544 | /* |
| 1545 | * A work-around for tcm_loop as some userspace code via |
| 1546 | * scsi-generic do not memset their associated read buffers, |
| 1547 | * so go ahead and do that here for type non-data CDBs. Also |
| 1548 | * note that this is currently guaranteed to be a single SGL |
| 1549 | * for this case by target core in target_setup_cmd_from_cdb() |
| 1550 | * -> transport_generic_cmd_sequencer(). |
| 1551 | */ |
| 1552 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && |
| 1553 | se_cmd->data_direction == DMA_FROM_DEVICE) { |
| 1554 | unsigned char *buf = NULL; |
| 1555 | |
| 1556 | if (sgl) |
| 1557 | buf = kmap(sg_page(sgl)) + sgl->offset; |
| 1558 | |
| 1559 | if (buf) { |
| 1560 | memset(buf, 0, sgl->length); |
| 1561 | kunmap(sg_page(sgl)); |
| 1562 | } |
| 1563 | } |
| 1564 | |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1565 | rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, |
| 1566 | sgl_bidi, sgl_bidi_count); |
| 1567 | if (rc != 0) { |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1568 | transport_generic_request_failure(se_cmd, rc); |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1569 | return 0; |
| 1570 | } |
| 1571 | } |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1572 | |
Andy Grover | 11e319e | 2012-04-03 15:51:28 -0700 | [diff] [blame] | 1573 | /* |
| 1574 | * Check if we need to delay processing because of ALUA |
| 1575 | * Active/NonOptimized primary access state.. |
| 1576 | */ |
| 1577 | core_alua_check_nonop_delay(se_cmd); |
| 1578 | |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1579 | transport_handle_cdb_direct(se_cmd); |
Roland Dreier | d6dfc86 | 2012-07-16 11:04:39 -0700 | [diff] [blame] | 1580 | return 0; |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1581 | } |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1582 | EXPORT_SYMBOL(target_submit_cmd_map_sgls); |
| 1583 | |
| 1584 | /* |
| 1585 | * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd |
| 1586 | * |
| 1587 | * @se_cmd: command descriptor to submit |
| 1588 | * @se_sess: associated se_sess for endpoint |
| 1589 | * @cdb: pointer to SCSI CDB |
| 1590 | * @sense: pointer to SCSI sense buffer |
| 1591 | * @unpacked_lun: unpacked LUN to reference for struct se_lun |
| 1592 | * @data_length: fabric expected data transfer length |
| 1593 | * @task_addr: SAM task attribute |
| 1594 | * @data_dir: DMA data direction |
| 1595 | * @flags: flags for command submission from target_sc_flags_tables |
| 1596 | * |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 1597 | * Task tags are supported if the caller has set @se_cmd->tag. |
| 1598 | * |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1599 | * Returns non zero to signal active I/O shutdown failure. All other |
| 1600 | * setup exceptions will be returned as a SCSI CHECK_CONDITION response, |
| 1601 | * but still return zero here. |
| 1602 | * |
| 1603 | * This may only be called from process context, and also currently |
| 1604 | * assumes internal allocation of fabric payload buffer by target-core. |
| 1605 | * |
| 1606 | * It also assumes interal target core SGL memory allocation. |
| 1607 | */ |
| 1608 | int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, |
Hannes Reinecke | f2d3068 | 2015-06-10 08:41:22 +0200 | [diff] [blame] | 1609 | unsigned char *cdb, unsigned char *sense, u64 unpacked_lun, |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1610 | u32 data_length, int task_attr, int data_dir, int flags) |
| 1611 | { |
| 1612 | return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, |
| 1613 | unpacked_lun, data_length, task_attr, data_dir, |
Nicholas Bellinger | def2b33 | 2013-12-23 20:38:30 +0000 | [diff] [blame] | 1614 | flags, NULL, 0, NULL, 0, NULL, 0); |
Nicholas Bellinger | a026757 | 2012-10-01 17:23:22 -0700 | [diff] [blame] | 1615 | } |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 1616 | EXPORT_SYMBOL(target_submit_cmd); |
| 1617 | |
Nicholas Bellinger | 9f0d05c | 2012-02-25 05:02:48 -0800 | [diff] [blame] | 1618 | static void target_complete_tmr_failure(struct work_struct *work) |
| 1619 | { |
| 1620 | struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); |
| 1621 | |
| 1622 | se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; |
| 1623 | se_cmd->se_tfo->queue_tm_rsp(se_cmd); |
Roland Dreier | 5a3b6fc0 | 2013-01-02 12:47:59 -0800 | [diff] [blame] | 1624 | |
| 1625 | transport_cmd_check_stop_to_fabric(se_cmd); |
Nicholas Bellinger | 9f0d05c | 2012-02-25 05:02:48 -0800 | [diff] [blame] | 1626 | } |
| 1627 | |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1628 | /** |
| 1629 | * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd |
| 1630 | * for TMR CDBs |
| 1631 | * |
| 1632 | * @se_cmd: command descriptor to submit |
| 1633 | * @se_sess: associated se_sess for endpoint |
| 1634 | * @sense: pointer to SCSI sense buffer |
| 1635 | * @unpacked_lun: unpacked LUN to reference for struct se_lun |
| 1636 | * @fabric_context: fabric context for TMR req |
| 1637 | * @tm_type: Type of TM request |
Nicholas Bellinger | c0974f8 | 2012-02-25 05:10:04 -0800 | [diff] [blame] | 1638 | * @gfp: gfp type for caller |
| 1639 | * @tag: referenced task tag for TMR_ABORT_TASK |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1640 | * @flags: submit cmd flags |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1641 | * |
| 1642 | * Callable from all contexts. |
| 1643 | **/ |
| 1644 | |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1645 | int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, |
Hannes Reinecke | f2d3068 | 2015-06-10 08:41:22 +0200 | [diff] [blame] | 1646 | unsigned char *sense, u64 unpacked_lun, |
Nicholas Bellinger | c0974f8 | 2012-02-25 05:10:04 -0800 | [diff] [blame] | 1647 | void *fabric_tmr_ptr, unsigned char tm_type, |
Bart Van Assche | 5261d86 | 2016-01-05 14:46:39 +0100 | [diff] [blame] | 1648 | gfp_t gfp, u64 tag, int flags) |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1649 | { |
| 1650 | struct se_portal_group *se_tpg; |
| 1651 | int ret; |
| 1652 | |
| 1653 | se_tpg = se_sess->se_tpg; |
| 1654 | BUG_ON(!se_tpg); |
| 1655 | |
| 1656 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 1657 | 0, DMA_NONE, TCM_SIMPLE_TAG, sense); |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1658 | /* |
| 1659 | * FIXME: Currently expect caller to handle se_cmd->se_tmr_req |
| 1660 | * allocation failure. |
| 1661 | */ |
Nicholas Bellinger | c0974f8 | 2012-02-25 05:10:04 -0800 | [diff] [blame] | 1662 | ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1663 | if (ret < 0) |
| 1664 | return -ENOMEM; |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1665 | |
Nicholas Bellinger | c0974f8 | 2012-02-25 05:10:04 -0800 | [diff] [blame] | 1666 | if (tm_type == TMR_ABORT_TASK) |
| 1667 | se_cmd->se_tmr_req->ref_task_tag = tag; |
| 1668 | |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1669 | /* See target_submit_cmd for commentary */ |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 1670 | ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF); |
Roland Dreier | bc187ea | 2012-07-16 11:04:40 -0700 | [diff] [blame] | 1671 | if (ret) { |
| 1672 | core_tmr_release_req(se_cmd->se_tmr_req); |
| 1673 | return ret; |
| 1674 | } |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1675 | |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1676 | ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); |
| 1677 | if (ret) { |
Nicholas Bellinger | 9f0d05c | 2012-02-25 05:02:48 -0800 | [diff] [blame] | 1678 | /* |
| 1679 | * For callback during failure handling, push this work off |
| 1680 | * to process context with TMR_LUN_DOES_NOT_EXIST status. |
| 1681 | */ |
| 1682 | INIT_WORK(&se_cmd->work, target_complete_tmr_failure); |
| 1683 | schedule_work(&se_cmd->work); |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1684 | return 0; |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1685 | } |
| 1686 | transport_generic_handle_tmr(se_cmd); |
Nicholas Bellinger | c7042ca | 2012-02-25 01:40:24 -0800 | [diff] [blame] | 1687 | return 0; |
Andy Grover | ea98d7f | 2012-01-19 13:39:21 -0800 | [diff] [blame] | 1688 | } |
| 1689 | EXPORT_SYMBOL(target_submit_tmr); |
| 1690 | |
Christoph Hellwig | cdbb70b | 2011-10-17 13:56:46 -0400 | [diff] [blame] | 1691 | /* |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1692 | * Handle SAM-esque emulation for generic transport request failures. |
| 1693 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1694 | void transport_generic_request_failure(struct se_cmd *cmd, |
| 1695 | sense_reason_t sense_reason) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1696 | { |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 1697 | int ret = 0, post_ret = 0; |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 1698 | |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 1699 | pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx" |
| 1700 | " CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1701 | pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1702 | cmd->se_tfo->get_cmd_state(cmd), |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1703 | cmd->t_state, sense_reason); |
Christoph Hellwig | d43d6ae | 2012-04-24 00:25:08 -0400 | [diff] [blame] | 1704 | pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", |
Christoph Hellwig | 7d680f3b | 2011-12-21 14:13:47 -0500 | [diff] [blame] | 1705 | (cmd->transport_state & CMD_T_ACTIVE) != 0, |
| 1706 | (cmd->transport_state & CMD_T_STOP) != 0, |
| 1707 | (cmd->transport_state & CMD_T_SENT) != 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1708 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1709 | /* |
| 1710 | * For SAM Task Attribute emulation for failed struct se_cmd |
| 1711 | */ |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1712 | transport_complete_task_attr(cmd); |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 1713 | /* |
| 1714 | * Handle special case for COMPARE_AND_WRITE failure, where the |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 1715 | * callback is expected to drop the per device ->caw_sem. |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 1716 | */ |
| 1717 | if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
| 1718 | cmd->transport_complete_callback) |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 1719 | cmd->transport_complete_callback(cmd, false, &post_ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1720 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1721 | switch (sense_reason) { |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 1722 | case TCM_NON_EXISTENT_LUN: |
| 1723 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
| 1724 | case TCM_INVALID_CDB_FIELD: |
| 1725 | case TCM_INVALID_PARAMETER_LIST: |
Roland Dreier | bb992e7 | 2013-02-08 15:18:39 -0800 | [diff] [blame] | 1726 | case TCM_PARAMETER_LIST_LENGTH_ERROR: |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 1727 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
| 1728 | case TCM_UNKNOWN_MODE_PAGE: |
| 1729 | case TCM_WRITE_PROTECTED: |
Roland Dreier | e2397c7 | 2012-07-16 15:34:21 -0700 | [diff] [blame] | 1730 | case TCM_ADDRESS_OUT_OF_RANGE: |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 1731 | case TCM_CHECK_CONDITION_ABORT_CMD: |
| 1732 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
| 1733 | case TCM_CHECK_CONDITION_NOT_READY: |
Nicholas Bellinger | 94387aa | 2014-02-23 14:04:09 +0000 | [diff] [blame] | 1734 | case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: |
| 1735 | case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: |
| 1736 | case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: |
Nicholas Bellinger | 449a137 | 2016-10-08 17:26:44 -0700 | [diff] [blame] | 1737 | case TCM_COPY_TARGET_DEVICE_NOT_REACHABLE: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1738 | break; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1739 | case TCM_OUT_OF_RESOURCES: |
| 1740 | sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 1741 | break; |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 1742 | case TCM_RESERVATION_CONFLICT: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1743 | /* |
| 1744 | * No SENSE Data payload for this case, set SCSI Status |
| 1745 | * and queue the response to $FABRIC_MOD. |
| 1746 | * |
| 1747 | * Uses linux/include/scsi/scsi.h SAM status codes defs |
| 1748 | */ |
| 1749 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 1750 | /* |
| 1751 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will |
| 1752 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION |
| 1753 | * CONFLICT STATUS. |
| 1754 | * |
| 1755 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 |
| 1756 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 1757 | if (cmd->se_sess && |
Hannes Reinecke | c51c8e7 | 2015-06-11 10:01:26 +0200 | [diff] [blame] | 1758 | cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) { |
| 1759 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, |
| 1760 | cmd->orig_fe_lun, 0x2C, |
| 1761 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); |
| 1762 | } |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 1763 | trace_target_cmd_complete(cmd); |
Hannes Reinecke | c51c8e7 | 2015-06-11 10:01:26 +0200 | [diff] [blame] | 1764 | ret = cmd->se_tfo->queue_status(cmd); |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 1765 | if (ret == -EAGAIN || ret == -ENOMEM) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 1766 | goto queue_full; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1767 | goto check_stop; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1768 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 1769 | pr_err("Unknown transport error for CDB 0x%02x: %d\n", |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1770 | cmd->t_task_cdb[0], sense_reason); |
| 1771 | sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1772 | break; |
| 1773 | } |
Christoph Hellwig | f314643 | 2012-07-08 15:58:48 -0400 | [diff] [blame] | 1774 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1775 | ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 1776 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 1777 | goto queue_full; |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 1778 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1779 | check_stop: |
| 1780 | transport_lun_remove_cmd(cmd); |
Andy Grover | 06b967e | 2015-09-03 16:03:43 -0700 | [diff] [blame] | 1781 | transport_cmd_check_stop_to_fabric(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 1782 | return; |
| 1783 | |
| 1784 | queue_full: |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 1785 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
| 1786 | transport_handle_queue_full(cmd, cmd->se_dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1787 | } |
Nicholas Bellinger | 2fbff127 | 2012-02-10 16:18:11 -0800 | [diff] [blame] | 1788 | EXPORT_SYMBOL(transport_generic_request_failure); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1789 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1790 | void __target_execute_cmd(struct se_cmd *cmd, bool do_checks) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1791 | { |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1792 | sense_reason_t ret; |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1793 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1794 | if (!cmd->execute_cmd) { |
| 1795 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 1796 | goto err; |
| 1797 | } |
| 1798 | if (do_checks) { |
| 1799 | /* |
| 1800 | * Check for an existing UNIT ATTENTION condition after |
| 1801 | * target_handle_task_attr() has done SAM task attr |
| 1802 | * checking, and possibly have already defered execution |
| 1803 | * out to target_restart_delayed_cmds() context. |
| 1804 | */ |
| 1805 | ret = target_scsi3_ua_check(cmd); |
| 1806 | if (ret) |
| 1807 | goto err; |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1808 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1809 | ret = target_alua_state_check(cmd); |
| 1810 | if (ret) |
| 1811 | goto err; |
| 1812 | |
| 1813 | ret = target_check_reservation(cmd); |
| 1814 | if (ret) { |
| 1815 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 1816 | goto err; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1817 | } |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1818 | } |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1819 | |
| 1820 | ret = cmd->execute_cmd(cmd); |
| 1821 | if (!ret) |
| 1822 | return; |
| 1823 | err: |
| 1824 | spin_lock_irq(&cmd->t_state_lock); |
| 1825 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
| 1826 | spin_unlock_irq(&cmd->t_state_lock); |
| 1827 | |
| 1828 | transport_generic_request_failure(cmd, ret); |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1829 | } |
| 1830 | |
Nicholas Bellinger | aa58b53 | 2015-02-08 12:39:06 -0800 | [diff] [blame] | 1831 | static int target_write_prot_action(struct se_cmd *cmd) |
| 1832 | { |
Nicholas Bellinger | 5132d1e | 2015-02-08 03:06:17 -0800 | [diff] [blame] | 1833 | u32 sectors; |
Nicholas Bellinger | aa58b53 | 2015-02-08 12:39:06 -0800 | [diff] [blame] | 1834 | /* |
| 1835 | * Perform WRITE_INSERT of PI using software emulation when backend |
| 1836 | * device has PI enabled, if the transport has not already generated |
| 1837 | * PI using hardware WRITE_INSERT offload. |
| 1838 | */ |
| 1839 | switch (cmd->prot_op) { |
| 1840 | case TARGET_PROT_DOUT_INSERT: |
| 1841 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) |
| 1842 | sbc_dif_generate(cmd); |
| 1843 | break; |
Nicholas Bellinger | 5132d1e | 2015-02-08 03:06:17 -0800 | [diff] [blame] | 1844 | case TARGET_PROT_DOUT_STRIP: |
| 1845 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) |
| 1846 | break; |
| 1847 | |
| 1848 | sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 1849 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
| 1850 | sectors, 0, cmd->t_prot_sg, 0); |
Nicholas Bellinger | 5132d1e | 2015-02-08 03:06:17 -0800 | [diff] [blame] | 1851 | if (unlikely(cmd->pi_err)) { |
| 1852 | spin_lock_irq(&cmd->t_state_lock); |
Bart Van Assche | 6c2faea | 2015-05-13 09:19:02 +0200 | [diff] [blame] | 1853 | cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); |
Nicholas Bellinger | 5132d1e | 2015-02-08 03:06:17 -0800 | [diff] [blame] | 1854 | spin_unlock_irq(&cmd->t_state_lock); |
| 1855 | transport_generic_request_failure(cmd, cmd->pi_err); |
| 1856 | return -1; |
| 1857 | } |
| 1858 | break; |
Nicholas Bellinger | aa58b53 | 2015-02-08 12:39:06 -0800 | [diff] [blame] | 1859 | default: |
| 1860 | break; |
| 1861 | } |
| 1862 | |
| 1863 | return 0; |
| 1864 | } |
| 1865 | |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1866 | static bool target_handle_task_attr(struct se_cmd *cmd) |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1867 | { |
| 1868 | struct se_device *dev = cmd->se_dev; |
| 1869 | |
Andy Grover | a354170 | 2015-05-19 14:44:41 -0700 | [diff] [blame] | 1870 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1871 | return false; |
| 1872 | |
Nicholas Bellinger | 410c29d | 2016-06-13 22:58:09 -0700 | [diff] [blame] | 1873 | cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; |
| 1874 | |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1875 | /* |
| 1876 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
| 1877 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
| 1878 | */ |
| 1879 | switch (cmd->sam_task_attr) { |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 1880 | case TCM_HEAD_TAG: |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 1881 | pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n", |
| 1882 | cmd->t_task_cdb[0]); |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1883 | return false; |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 1884 | case TCM_ORDERED_TAG: |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 1885 | atomic_inc_mb(&dev->dev_ordered_sync); |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1886 | |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 1887 | pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n", |
| 1888 | cmd->t_task_cdb[0]); |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1889 | |
| 1890 | /* |
| 1891 | * Execute an ORDERED command if no other older commands |
| 1892 | * exist that need to be completed first. |
| 1893 | */ |
| 1894 | if (!atomic_read(&dev->simple_cmds)) |
| 1895 | return false; |
| 1896 | break; |
| 1897 | default: |
| 1898 | /* |
| 1899 | * For SIMPLE and UNTAGGED Task Attribute commands |
| 1900 | */ |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 1901 | atomic_inc_mb(&dev->simple_cmds); |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1902 | break; |
| 1903 | } |
| 1904 | |
| 1905 | if (atomic_read(&dev->dev_ordered_sync) == 0) |
| 1906 | return false; |
| 1907 | |
| 1908 | spin_lock(&dev->delayed_cmd_lock); |
| 1909 | list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); |
| 1910 | spin_unlock(&dev->delayed_cmd_lock); |
| 1911 | |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 1912 | pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn", |
| 1913 | cmd->t_task_cdb[0], cmd->sam_task_attr); |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1914 | return true; |
| 1915 | } |
| 1916 | |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 1917 | static int __transport_check_aborted_status(struct se_cmd *, int); |
| 1918 | |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1919 | void target_execute_cmd(struct se_cmd *cmd) |
| 1920 | { |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1921 | /* |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1922 | * Determine if frontend context caller is requesting the stopping of |
| 1923 | * this command for frontend exceptions. |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 1924 | * |
| 1925 | * If the received CDB has aleady been aborted stop processing it here. |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1926 | */ |
Nicholas Bellinger | 4a9a6c8 | 2013-11-06 21:05:19 -0800 | [diff] [blame] | 1927 | spin_lock_irq(&cmd->t_state_lock); |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 1928 | if (__transport_check_aborted_status(cmd, 1)) { |
| 1929 | spin_unlock_irq(&cmd->t_state_lock); |
| 1930 | return; |
| 1931 | } |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1932 | if (cmd->transport_state & CMD_T_STOP) { |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 1933 | pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n", |
| 1934 | __func__, __LINE__, cmd->tag); |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1935 | |
| 1936 | spin_unlock_irq(&cmd->t_state_lock); |
Nicholas Bellinger | a95d651 | 2014-06-09 23:36:51 +0000 | [diff] [blame] | 1937 | complete_all(&cmd->t_transport_stop_comp); |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1938 | return; |
| 1939 | } |
| 1940 | |
| 1941 | cmd->t_state = TRANSPORT_PROCESSING; |
Nicholas Bellinger | 1a398b9 | 2013-06-06 01:40:27 -0700 | [diff] [blame] | 1942 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
Christoph Hellwig | f7113a4 | 2012-07-08 15:58:38 -0400 | [diff] [blame] | 1943 | spin_unlock_irq(&cmd->t_state_lock); |
Nicholas Bellinger | aa58b53 | 2015-02-08 12:39:06 -0800 | [diff] [blame] | 1944 | |
| 1945 | if (target_write_prot_action(cmd)) |
| 1946 | return; |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1947 | |
Nicholas Bellinger | 1a398b9 | 2013-06-06 01:40:27 -0700 | [diff] [blame] | 1948 | if (target_handle_task_attr(cmd)) { |
| 1949 | spin_lock_irq(&cmd->t_state_lock); |
Bart Van Assche | 6c2faea | 2015-05-13 09:19:02 +0200 | [diff] [blame] | 1950 | cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT); |
Nicholas Bellinger | 1a398b9 | 2013-06-06 01:40:27 -0700 | [diff] [blame] | 1951 | spin_unlock_irq(&cmd->t_state_lock); |
| 1952 | return; |
| 1953 | } |
| 1954 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1955 | __target_execute_cmd(cmd, true); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1956 | } |
Christoph Hellwig | 70baf0a | 2012-07-08 15:58:39 -0400 | [diff] [blame] | 1957 | EXPORT_SYMBOL(target_execute_cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1958 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1959 | /* |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1960 | * Process all commands up to the last received ORDERED task attribute which |
| 1961 | * requires another blocking boundary |
| 1962 | */ |
| 1963 | static void target_restart_delayed_cmds(struct se_device *dev) |
| 1964 | { |
| 1965 | for (;;) { |
| 1966 | struct se_cmd *cmd; |
| 1967 | |
| 1968 | spin_lock(&dev->delayed_cmd_lock); |
| 1969 | if (list_empty(&dev->delayed_cmd_list)) { |
| 1970 | spin_unlock(&dev->delayed_cmd_lock); |
| 1971 | break; |
| 1972 | } |
| 1973 | |
| 1974 | cmd = list_entry(dev->delayed_cmd_list.next, |
| 1975 | struct se_cmd, se_delayed_node); |
| 1976 | list_del(&cmd->se_delayed_node); |
| 1977 | spin_unlock(&dev->delayed_cmd_lock); |
| 1978 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 1979 | __target_execute_cmd(cmd, true); |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1980 | |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 1981 | if (cmd->sam_task_attr == TCM_ORDERED_TAG) |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 1982 | break; |
| 1983 | } |
| 1984 | } |
| 1985 | |
| 1986 | /* |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 1987 | * Called from I/O completion to determine which dormant/delayed |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1988 | * and ordered cmds need to have their tasks added to the execution queue. |
| 1989 | */ |
| 1990 | static void transport_complete_task_attr(struct se_cmd *cmd) |
| 1991 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 1992 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1993 | |
Andy Grover | a354170 | 2015-05-19 14:44:41 -0700 | [diff] [blame] | 1994 | if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 1995 | return; |
| 1996 | |
Nicholas Bellinger | 410c29d | 2016-06-13 22:58:09 -0700 | [diff] [blame] | 1997 | if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) |
| 1998 | goto restart; |
| 1999 | |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 2000 | if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 2001 | atomic_dec_mb(&dev->simple_cmds); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2002 | dev->dev_cur_ordered_id++; |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 2003 | pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n", |
| 2004 | dev->dev_cur_ordered_id); |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 2005 | } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2006 | dev->dev_cur_ordered_id++; |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 2007 | pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n", |
| 2008 | dev->dev_cur_ordered_id); |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 2009 | } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 2010 | atomic_dec_mb(&dev->dev_ordered_sync); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2011 | |
| 2012 | dev->dev_cur_ordered_id++; |
Roland Dreier | 9c31820 | 2015-07-21 17:45:32 -0700 | [diff] [blame] | 2013 | pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", |
| 2014 | dev->dev_cur_ordered_id); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2015 | } |
Nicholas Bellinger | 410c29d | 2016-06-13 22:58:09 -0700 | [diff] [blame] | 2016 | restart: |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 2017 | target_restart_delayed_cmds(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2018 | } |
| 2019 | |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2020 | static void transport_complete_qf(struct se_cmd *cmd) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2021 | { |
| 2022 | int ret = 0; |
| 2023 | |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 2024 | transport_complete_task_attr(cmd); |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2025 | |
| 2026 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 2027 | trace_target_cmd_complete(cmd); |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2028 | ret = cmd->se_tfo->queue_status(cmd); |
Quinn Tran | 082f58a | 2014-09-25 06:22:28 -0400 | [diff] [blame] | 2029 | goto out; |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2030 | } |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2031 | |
| 2032 | switch (cmd->data_direction) { |
| 2033 | case DMA_FROM_DEVICE: |
Nicholas Bellinger | 4347ab5a | 2016-03-04 22:30:52 -0800 | [diff] [blame] | 2034 | if (cmd->scsi_status) |
| 2035 | goto queue_status; |
| 2036 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 2037 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2038 | ret = cmd->se_tfo->queue_data_in(cmd); |
| 2039 | break; |
| 2040 | case DMA_TO_DEVICE: |
Nicholas Bellinger | 6457740 | 2013-08-21 14:39:19 -0700 | [diff] [blame] | 2041 | if (cmd->se_cmd_flags & SCF_BIDI) { |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2042 | ret = cmd->se_tfo->queue_data_in(cmd); |
Bart Van Assche | 63509c6 | 2015-05-13 09:17:54 +0200 | [diff] [blame] | 2043 | break; |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2044 | } |
| 2045 | /* Fall through for DMA_TO_DEVICE */ |
| 2046 | case DMA_NONE: |
Nicholas Bellinger | 4347ab5a | 2016-03-04 22:30:52 -0800 | [diff] [blame] | 2047 | queue_status: |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 2048 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2049 | ret = cmd->se_tfo->queue_status(cmd); |
| 2050 | break; |
| 2051 | default: |
| 2052 | break; |
| 2053 | } |
| 2054 | |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2055 | out: |
| 2056 | if (ret < 0) { |
| 2057 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2058 | return; |
| 2059 | } |
| 2060 | transport_lun_remove_cmd(cmd); |
| 2061 | transport_cmd_check_stop_to_fabric(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2062 | } |
| 2063 | |
| 2064 | static void transport_handle_queue_full( |
| 2065 | struct se_cmd *cmd, |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2066 | struct se_device *dev) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2067 | { |
| 2068 | spin_lock_irq(&dev->qf_cmd_lock); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2069 | list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); |
Joern Engel | 33940d0 | 2014-09-16 16:23:12 -0400 | [diff] [blame] | 2070 | atomic_inc_mb(&dev->dev_qf_count); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2071 | spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); |
| 2072 | |
| 2073 | schedule_work(&cmd->se_dev->qf_work_queue); |
| 2074 | } |
| 2075 | |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2076 | static bool target_read_prot_action(struct se_cmd *cmd) |
Nicholas Bellinger | bc00586 | 2014-04-02 14:55:33 -0700 | [diff] [blame] | 2077 | { |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2078 | switch (cmd->prot_op) { |
| 2079 | case TARGET_PROT_DIN_STRIP: |
| 2080 | if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 2081 | u32 sectors = cmd->data_length >> |
| 2082 | ilog2(cmd->se_dev->dev_attrib.block_size); |
| 2083 | |
| 2084 | cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba, |
| 2085 | sectors, 0, cmd->t_prot_sg, |
| 2086 | 0); |
| 2087 | if (cmd->pi_err) |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2088 | return true; |
Nicholas Bellinger | bc00586 | 2014-04-02 14:55:33 -0700 | [diff] [blame] | 2089 | } |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2090 | break; |
Nicholas Bellinger | 72c03850 | 2015-02-08 04:02:08 -0800 | [diff] [blame] | 2091 | case TARGET_PROT_DIN_INSERT: |
| 2092 | if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) |
| 2093 | break; |
| 2094 | |
| 2095 | sbc_dif_generate(cmd); |
| 2096 | break; |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2097 | default: |
| 2098 | break; |
Nicholas Bellinger | bc00586 | 2014-04-02 14:55:33 -0700 | [diff] [blame] | 2099 | } |
| 2100 | |
| 2101 | return false; |
| 2102 | } |
| 2103 | |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 2104 | static void target_complete_ok_work(struct work_struct *work) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2105 | { |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 2106 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
Paolo Bonzini | 27a2709 | 2012-09-05 17:09:14 +0200 | [diff] [blame] | 2107 | int ret; |
Christoph Hellwig | 35e0e75 | 2011-10-17 13:56:53 -0400 | [diff] [blame] | 2108 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2109 | /* |
| 2110 | * Check if we need to move delayed/dormant tasks from cmds on the |
| 2111 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task |
| 2112 | * Attribute. |
| 2113 | */ |
Christoph Hellwig | 019c4ca | 2012-10-10 17:37:14 -0400 | [diff] [blame] | 2114 | transport_complete_task_attr(cmd); |
| 2115 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2116 | /* |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2117 | * Check to schedule QUEUE_FULL work, or execute an existing |
| 2118 | * cmd->transport_qf_callback() |
| 2119 | */ |
| 2120 | if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) |
| 2121 | schedule_work(&cmd->se_dev->qf_work_queue); |
| 2122 | |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2123 | /* |
Paolo Bonzini | d5829ea | 2012-09-05 17:09:15 +0200 | [diff] [blame] | 2124 | * Check if we need to send a sense buffer from |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2125 | * the struct se_cmd in question. |
| 2126 | */ |
| 2127 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { |
Paolo Bonzini | 27a2709 | 2012-09-05 17:09:14 +0200 | [diff] [blame] | 2128 | WARN_ON(!cmd->scsi_status); |
Paolo Bonzini | 27a2709 | 2012-09-05 17:09:14 +0200 | [diff] [blame] | 2129 | ret = transport_send_check_condition_and_sense( |
| 2130 | cmd, 0, 1); |
| 2131 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2132 | goto queue_full; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2133 | |
Paolo Bonzini | 27a2709 | 2012-09-05 17:09:14 +0200 | [diff] [blame] | 2134 | transport_lun_remove_cmd(cmd); |
| 2135 | transport_cmd_check_stop_to_fabric(cmd); |
| 2136 | return; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2137 | } |
| 2138 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2139 | * Check for a callback, used by amongst other things |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2140 | * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2141 | */ |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2142 | if (cmd->transport_complete_callback) { |
| 2143 | sense_reason_t rc; |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 2144 | bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE); |
| 2145 | bool zero_dl = !(cmd->data_length); |
| 2146 | int post_ret = 0; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2147 | |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 2148 | rc = cmd->transport_complete_callback(cmd, true, &post_ret); |
| 2149 | if (!rc && !post_ret) { |
| 2150 | if (caw && zero_dl) |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2151 | goto queue_rsp; |
| 2152 | |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2153 | return; |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 2154 | } else if (rc) { |
| 2155 | ret = transport_send_check_condition_and_sense(cmd, |
| 2156 | rc, 0); |
| 2157 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2158 | goto queue_full; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2159 | |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 2160 | transport_lun_remove_cmd(cmd); |
| 2161 | transport_cmd_check_stop_to_fabric(cmd); |
| 2162 | return; |
| 2163 | } |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 2164 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2165 | |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2166 | queue_rsp: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2167 | switch (cmd->data_direction) { |
| 2168 | case DMA_FROM_DEVICE: |
Nicholas Bellinger | 4347ab5a | 2016-03-04 22:30:52 -0800 | [diff] [blame] | 2169 | if (cmd->scsi_status) |
| 2170 | goto queue_status; |
| 2171 | |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 2172 | atomic_long_add(cmd->data_length, |
| 2173 | &cmd->se_lun->lun_stats.tx_data_octets); |
Nicholas Bellinger | bc00586 | 2014-04-02 14:55:33 -0700 | [diff] [blame] | 2174 | /* |
| 2175 | * Perform READ_STRIP of PI using software emulation when |
| 2176 | * backend had PI enabled, if the transport will not be |
| 2177 | * performing hardware READ_STRIP offload. |
| 2178 | */ |
Nicholas Bellinger | fdeab85 | 2015-02-08 02:53:25 -0800 | [diff] [blame] | 2179 | if (target_read_prot_action(cmd)) { |
Nicholas Bellinger | bc00586 | 2014-04-02 14:55:33 -0700 | [diff] [blame] | 2180 | ret = transport_send_check_condition_and_sense(cmd, |
| 2181 | cmd->pi_err, 0); |
| 2182 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2183 | goto queue_full; |
| 2184 | |
| 2185 | transport_lun_remove_cmd(cmd); |
| 2186 | transport_cmd_check_stop_to_fabric(cmd); |
| 2187 | return; |
| 2188 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2189 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 2190 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2191 | ret = cmd->se_tfo->queue_data_in(cmd); |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 2192 | if (ret == -EAGAIN || ret == -ENOMEM) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2193 | goto queue_full; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2194 | break; |
| 2195 | case DMA_TO_DEVICE: |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 2196 | atomic_long_add(cmd->data_length, |
| 2197 | &cmd->se_lun->lun_stats.rx_data_octets); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2198 | /* |
| 2199 | * Check if we need to send READ payload for BIDI-COMMAND |
| 2200 | */ |
Nicholas Bellinger | 6457740 | 2013-08-21 14:39:19 -0700 | [diff] [blame] | 2201 | if (cmd->se_cmd_flags & SCF_BIDI) { |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 2202 | atomic_long_add(cmd->data_length, |
| 2203 | &cmd->se_lun->lun_stats.tx_data_octets); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2204 | ret = cmd->se_tfo->queue_data_in(cmd); |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 2205 | if (ret == -EAGAIN || ret == -ENOMEM) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2206 | goto queue_full; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2207 | break; |
| 2208 | } |
| 2209 | /* Fall through for DMA_TO_DEVICE */ |
| 2210 | case DMA_NONE: |
Nicholas Bellinger | 4347ab5a | 2016-03-04 22:30:52 -0800 | [diff] [blame] | 2211 | queue_status: |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 2212 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2213 | ret = cmd->se_tfo->queue_status(cmd); |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 2214 | if (ret == -EAGAIN || ret == -ENOMEM) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2215 | goto queue_full; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2216 | break; |
| 2217 | default: |
| 2218 | break; |
| 2219 | } |
| 2220 | |
| 2221 | transport_lun_remove_cmd(cmd); |
| 2222 | transport_cmd_check_stop_to_fabric(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2223 | return; |
| 2224 | |
| 2225 | queue_full: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2226 | pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2227 | " data_direction: %d\n", cmd, cmd->data_direction); |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2228 | cmd->t_state = TRANSPORT_COMPLETE_QF_OK; |
| 2229 | transport_handle_queue_full(cmd, cmd->se_dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2230 | } |
| 2231 | |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2232 | void target_free_sgl(struct scatterlist *sgl, int nents) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2233 | { |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2234 | struct scatterlist *sg; |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2235 | int count; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2236 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2237 | for_each_sg(sgl, sg, nents, count) |
| 2238 | __free_page(sg_page(sg)); |
| 2239 | |
| 2240 | kfree(sgl); |
| 2241 | } |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2242 | EXPORT_SYMBOL(target_free_sgl); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2243 | |
Nicholas Bellinger | 47e459e | 2013-08-20 10:45:16 -0700 | [diff] [blame] | 2244 | static inline void transport_reset_sgl_orig(struct se_cmd *cmd) |
| 2245 | { |
| 2246 | /* |
| 2247 | * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE |
| 2248 | * emulation, and free + reset pointers if necessary.. |
| 2249 | */ |
| 2250 | if (!cmd->t_data_sg_orig) |
| 2251 | return; |
| 2252 | |
| 2253 | kfree(cmd->t_data_sg); |
| 2254 | cmd->t_data_sg = cmd->t_data_sg_orig; |
| 2255 | cmd->t_data_sg_orig = NULL; |
| 2256 | cmd->t_data_nents = cmd->t_data_nents_orig; |
| 2257 | cmd->t_data_nents_orig = 0; |
| 2258 | } |
| 2259 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2260 | static inline void transport_free_pages(struct se_cmd *cmd) |
| 2261 | { |
Akinobu Mita | 5835812 | 2015-05-01 15:23:49 +0900 | [diff] [blame] | 2262 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2263 | target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); |
Akinobu Mita | 5835812 | 2015-05-01 15:23:49 +0900 | [diff] [blame] | 2264 | cmd->t_prot_sg = NULL; |
| 2265 | cmd->t_prot_nents = 0; |
| 2266 | } |
| 2267 | |
Nicholas Bellinger | 47e459e | 2013-08-20 10:45:16 -0700 | [diff] [blame] | 2268 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2269 | /* |
| 2270 | * Release special case READ buffer payload required for |
| 2271 | * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE |
| 2272 | */ |
| 2273 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2274 | target_free_sgl(cmd->t_bidi_data_sg, |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2275 | cmd->t_bidi_data_nents); |
| 2276 | cmd->t_bidi_data_sg = NULL; |
| 2277 | cmd->t_bidi_data_nents = 0; |
| 2278 | } |
Nicholas Bellinger | 47e459e | 2013-08-20 10:45:16 -0700 | [diff] [blame] | 2279 | transport_reset_sgl_orig(cmd); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 2280 | return; |
Nicholas Bellinger | 47e459e | 2013-08-20 10:45:16 -0700 | [diff] [blame] | 2281 | } |
| 2282 | transport_reset_sgl_orig(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2283 | |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2284 | target_free_sgl(cmd->t_data_sg, cmd->t_data_nents); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2285 | cmd->t_data_sg = NULL; |
| 2286 | cmd->t_data_nents = 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2287 | |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2288 | target_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2289 | cmd->t_bidi_data_sg = NULL; |
| 2290 | cmd->t_bidi_data_nents = 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2291 | } |
| 2292 | |
Christoph Hellwig | d3df782 | 2011-09-13 23:08:32 +0200 | [diff] [blame] | 2293 | /** |
| 2294 | * transport_put_cmd - release a reference to a command |
| 2295 | * @cmd: command to release |
| 2296 | * |
| 2297 | * This routine releases our reference to the command and frees it if possible. |
| 2298 | */ |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 2299 | static int transport_put_cmd(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2300 | { |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2301 | BUG_ON(!cmd->se_tfo); |
| 2302 | /* |
| 2303 | * If this cmd has been setup with target_get_sess_cmd(), drop |
| 2304 | * the kref and call ->release_cmd() in kref callback. |
| 2305 | */ |
| 2306 | return target_put_sess_cmd(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2307 | } |
| 2308 | |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2309 | void *transport_kmap_data_sg(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2310 | { |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2311 | struct scatterlist *sg = cmd->t_data_sg; |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2312 | struct page **pages; |
| 2313 | int i; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2314 | |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2315 | /* |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2316 | * We need to take into account a possible offset here for fabrics like |
| 2317 | * tcm_loop who may be using a contig buffer from the SCSI midlayer for |
| 2318 | * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2319 | */ |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2320 | if (!cmd->t_data_nents) |
| 2321 | return NULL; |
Paolo Bonzini | 3717ef0 | 2012-09-07 17:30:35 +0200 | [diff] [blame] | 2322 | |
| 2323 | BUG_ON(!sg); |
| 2324 | if (cmd->t_data_nents == 1) |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2325 | return kmap(sg_page(sg)) + sg->offset; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2326 | |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2327 | /* >1 page. use vmap */ |
| 2328 | pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2329 | if (!pages) |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2330 | return NULL; |
| 2331 | |
| 2332 | /* convert sg[] to pages[] */ |
| 2333 | for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { |
| 2334 | pages[i] = sg_page(sg); |
| 2335 | } |
| 2336 | |
| 2337 | cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); |
| 2338 | kfree(pages); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2339 | if (!cmd->t_data_vmap) |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2340 | return NULL; |
| 2341 | |
| 2342 | return cmd->t_data_vmap + cmd->t_data_sg[0].offset; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2343 | } |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2344 | EXPORT_SYMBOL(transport_kmap_data_sg); |
| 2345 | |
| 2346 | void transport_kunmap_data_sg(struct se_cmd *cmd) |
| 2347 | { |
Andy Grover | a1edf9c | 2012-02-09 12:18:06 -0800 | [diff] [blame] | 2348 | if (!cmd->t_data_nents) { |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2349 | return; |
Andy Grover | a1edf9c | 2012-02-09 12:18:06 -0800 | [diff] [blame] | 2350 | } else if (cmd->t_data_nents == 1) { |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2351 | kunmap(sg_page(cmd->t_data_sg)); |
Andy Grover | a1edf9c | 2012-02-09 12:18:06 -0800 | [diff] [blame] | 2352 | return; |
| 2353 | } |
Andy Grover | 4949314 | 2012-01-16 16:57:08 -0800 | [diff] [blame] | 2354 | |
| 2355 | vunmap(cmd->t_data_vmap); |
| 2356 | cmd->t_data_vmap = NULL; |
| 2357 | } |
| 2358 | EXPORT_SYMBOL(transport_kunmap_data_sg); |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2359 | |
Nicholas Bellinger | c5ff8d6 | 2013-08-22 11:58:43 -0700 | [diff] [blame] | 2360 | int |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2361 | target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2362 | bool zero_page, bool chainable) |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2363 | { |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2364 | struct scatterlist *sg; |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2365 | struct page *page; |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2366 | gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2367 | unsigned int nalloc, nent; |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2368 | int i = 0; |
Andy Grover | 05d1c7c | 2011-07-20 19:13:28 +0000 | [diff] [blame] | 2369 | |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2370 | nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE); |
| 2371 | if (chainable) |
| 2372 | nalloc++; |
| 2373 | sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL); |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2374 | if (!sg) |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 2375 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2376 | |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2377 | sg_init_table(sg, nalloc); |
roland@purestorage.com | 9db9da3 | 2012-01-04 15:59:58 -0800 | [diff] [blame] | 2378 | |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2379 | while (length) { |
| 2380 | u32 page_len = min_t(u32, length, PAGE_SIZE); |
roland@purestorage.com | 9db9da3 | 2012-01-04 15:59:58 -0800 | [diff] [blame] | 2381 | page = alloc_page(GFP_KERNEL | zero_flag); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2382 | if (!page) |
| 2383 | goto out; |
| 2384 | |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2385 | sg_set_page(&sg[i], page, page_len, 0); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2386 | length -= page_len; |
| 2387 | i++; |
| 2388 | } |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2389 | *sgl = sg; |
| 2390 | *nents = nent; |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2391 | return 0; |
| 2392 | |
| 2393 | out: |
Yi Zou | d0e27c8 | 2012-08-14 16:06:43 -0700 | [diff] [blame] | 2394 | while (i > 0) { |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2395 | i--; |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2396 | __free_page(sg_page(&sg[i])); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2397 | } |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2398 | kfree(sg); |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2399 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2400 | } |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2401 | EXPORT_SYMBOL(target_alloc_sgl); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2402 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2403 | /* |
Andy Grover | b16a35b | 2012-04-03 15:51:21 -0700 | [diff] [blame] | 2404 | * Allocate any required resources to execute the command. For writes we |
| 2405 | * might not have the payload yet, so notify the fabric via a call to |
| 2406 | * ->write_pending instead. Otherwise place it on the execution queue. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2407 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2408 | sense_reason_t |
| 2409 | transport_generic_new_cmd(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2410 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2411 | int ret = 0; |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2412 | bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2413 | |
Akinobu Mita | 5835812 | 2015-05-01 15:23:49 +0900 | [diff] [blame] | 2414 | if (cmd->prot_op != TARGET_PROT_NORMAL && |
| 2415 | !(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) { |
| 2416 | ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents, |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2417 | cmd->prot_length, true, false); |
Akinobu Mita | 5835812 | 2015-05-01 15:23:49 +0900 | [diff] [blame] | 2418 | if (ret < 0) |
| 2419 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 2420 | } |
| 2421 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2422 | /* |
| 2423 | * Determine is the TCM fabric module has already allocated physical |
| 2424 | * memory, and is directly calling transport_generic_map_mem_to_cmd() |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2425 | * beforehand. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2426 | */ |
Andy Grover | ec98f78 | 2011-07-20 19:28:46 +0000 | [diff] [blame] | 2427 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && |
| 2428 | cmd->data_length) { |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2429 | |
Nicholas Bellinger | 8cefe07 | 2013-08-25 16:10:57 -0700 | [diff] [blame] | 2430 | if ((cmd->se_cmd_flags & SCF_BIDI) || |
| 2431 | (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { |
| 2432 | u32 bidi_length; |
| 2433 | |
| 2434 | if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) |
| 2435 | bidi_length = cmd->t_task_nolb * |
| 2436 | cmd->se_dev->dev_attrib.block_size; |
| 2437 | else |
| 2438 | bidi_length = cmd->data_length; |
| 2439 | |
| 2440 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, |
| 2441 | &cmd->t_bidi_data_nents, |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2442 | bidi_length, zero_flag, false); |
Nicholas Bellinger | 8cefe07 | 2013-08-25 16:10:57 -0700 | [diff] [blame] | 2443 | if (ret < 0) |
| 2444 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 2445 | } |
| 2446 | |
Nicholas Bellinger | 2009399 | 2013-08-25 15:44:03 -0700 | [diff] [blame] | 2447 | ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2448 | cmd->data_length, zero_flag, false); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2449 | if (ret < 0) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2450 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2451 | } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && |
| 2452 | cmd->data_length) { |
| 2453 | /* |
| 2454 | * Special case for COMPARE_AND_WRITE with fabrics |
| 2455 | * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. |
| 2456 | */ |
| 2457 | u32 caw_length = cmd->t_task_nolb * |
| 2458 | cmd->se_dev->dev_attrib.block_size; |
| 2459 | |
| 2460 | ret = target_alloc_sgl(&cmd->t_bidi_data_sg, |
| 2461 | &cmd->t_bidi_data_nents, |
Christoph Hellwig | e64aa65 | 2016-05-03 18:01:10 +0200 | [diff] [blame] | 2462 | caw_length, zero_flag, false); |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 2463 | if (ret < 0) |
| 2464 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2465 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2466 | /* |
Christoph Hellwig | c3196f0 | 2012-07-08 15:58:41 -0400 | [diff] [blame] | 2467 | * If this command is not a write we can execute it right here, |
| 2468 | * for write buffers we need to notify the fabric driver first |
| 2469 | * and let it call back once the write buffers are ready. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2470 | */ |
Christoph Hellwig | 5f41a31 | 2012-05-20 14:34:44 -0400 | [diff] [blame] | 2471 | target_add_to_state_list(cmd); |
Roland Dreier | 885e7b0 | 2014-10-14 14:16:24 -0700 | [diff] [blame] | 2472 | if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { |
Christoph Hellwig | c3196f0 | 2012-07-08 15:58:41 -0400 | [diff] [blame] | 2473 | target_execute_cmd(cmd); |
| 2474 | return 0; |
| 2475 | } |
Nicholas Bellinger | 862e638 | 2013-06-06 01:35:18 -0700 | [diff] [blame] | 2476 | transport_cmd_check_stop(cmd, false, true); |
Christoph Hellwig | c3196f0 | 2012-07-08 15:58:41 -0400 | [diff] [blame] | 2477 | |
| 2478 | ret = cmd->se_tfo->write_pending(cmd); |
| 2479 | if (ret == -EAGAIN || ret == -ENOMEM) |
| 2480 | goto queue_full; |
| 2481 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2482 | /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ |
| 2483 | WARN_ON(ret); |
Christoph Hellwig | da0f761 | 2011-10-18 06:57:01 -0400 | [diff] [blame] | 2484 | |
Nicholas Bellinger | b69c1fc | 2012-11-06 15:43:53 -0800 | [diff] [blame] | 2485 | return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2486 | |
Christoph Hellwig | c3196f0 | 2012-07-08 15:58:41 -0400 | [diff] [blame] | 2487 | queue_full: |
| 2488 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); |
| 2489 | cmd->t_state = TRANSPORT_COMPLETE_QF_WP; |
| 2490 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2491 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2492 | } |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2493 | EXPORT_SYMBOL(transport_generic_new_cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2494 | |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2495 | static void transport_write_pending_qf(struct se_cmd *cmd) |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2496 | { |
Nicholas Bellinger | f147abb | 2011-10-25 23:57:41 -0700 | [diff] [blame] | 2497 | int ret; |
| 2498 | |
| 2499 | ret = cmd->se_tfo->write_pending(cmd); |
| 2500 | if (ret == -EAGAIN || ret == -ENOMEM) { |
Christoph Hellwig | e057f53 | 2011-10-17 13:56:41 -0400 | [diff] [blame] | 2501 | pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", |
| 2502 | cmd); |
| 2503 | transport_handle_queue_full(cmd, cmd->se_dev); |
| 2504 | } |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 2505 | } |
| 2506 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2507 | static bool |
| 2508 | __transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *, |
| 2509 | unsigned long *flags); |
| 2510 | |
| 2511 | static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas) |
| 2512 | { |
| 2513 | unsigned long flags; |
| 2514 | |
| 2515 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 2516 | __transport_wait_for_tasks(cmd, true, aborted, tas, &flags); |
| 2517 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 2518 | } |
| 2519 | |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 2520 | int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2521 | { |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 2522 | int ret = 0; |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2523 | bool aborted = false, tas = false; |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 2524 | |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2525 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { |
Andy Grover | c8e31f2 | 2012-01-19 13:39:17 -0800 | [diff] [blame] | 2526 | if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2527 | target_wait_free_cmd(cmd, &aborted, &tas); |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2528 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2529 | if (!aborted || tas) |
| 2530 | ret = transport_put_cmd(cmd); |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2531 | } else { |
| 2532 | if (wait_for_tasks) |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2533 | target_wait_free_cmd(cmd, &aborted, &tas); |
Nicholas Bellinger | c130480 | 2013-08-31 15:12:01 -0700 | [diff] [blame] | 2534 | /* |
| 2535 | * Handle WRITE failure case where transport_generic_new_cmd() |
| 2536 | * has already added se_cmd to state_list, but fabric has |
| 2537 | * failed command before I/O submission. |
| 2538 | */ |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2539 | if (cmd->state_active) |
Nicholas Bellinger | c130480 | 2013-08-31 15:12:01 -0700 | [diff] [blame] | 2540 | target_remove_from_state_list(cmd); |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2541 | |
Christoph Hellwig | 82f1c8a | 2011-09-13 23:09:01 +0200 | [diff] [blame] | 2542 | if (cmd->se_lun) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2543 | transport_lun_remove_cmd(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2544 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2545 | if (!aborted || tas) |
| 2546 | ret = transport_put_cmd(cmd); |
| 2547 | } |
| 2548 | /* |
| 2549 | * If the task has been internally aborted due to TMR ABORT_TASK |
| 2550 | * or LUN_RESET, target_core_tmr.c is responsible for performing |
| 2551 | * the remaining calls to target_put_sess_cmd(), and not the |
| 2552 | * callers of this function. |
| 2553 | */ |
| 2554 | if (aborted) { |
| 2555 | pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag); |
| 2556 | wait_for_completion(&cmd->cmd_wait_comp); |
| 2557 | cmd->se_tfo->release_cmd(cmd); |
| 2558 | ret = 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2559 | } |
Nicholas Bellinger | d5ddad416 | 2013-05-31 00:46:11 -0700 | [diff] [blame] | 2560 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2561 | } |
| 2562 | EXPORT_SYMBOL(transport_generic_free_cmd); |
| 2563 | |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2564 | /* target_get_sess_cmd - Add command to active ->sess_cmd_list |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2565 | * @se_cmd: command descriptor to add |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 2566 | * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2567 | */ |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 2568 | int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref) |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2569 | { |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 2570 | struct se_session *se_sess = se_cmd->se_sess; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2571 | unsigned long flags; |
Roland Dreier | bc187ea | 2012-07-16 11:04:40 -0700 | [diff] [blame] | 2572 | int ret = 0; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2573 | |
Nicholas Bellinger | a636078 | 2011-11-18 20:36:22 -0800 | [diff] [blame] | 2574 | /* |
| 2575 | * Add a second kref if the fabric caller is expecting to handle |
| 2576 | * fabric acknowledgement that requires two target_put_sess_cmd() |
| 2577 | * invocations before se_cmd descriptor release. |
| 2578 | */ |
Nicholas Bellinger | 527268d | 2016-10-04 16:37:05 -0700 | [diff] [blame] | 2579 | if (ack_kref) { |
Hannes Reinecke | 1b4c59b | 2016-08-22 10:54:07 +0200 | [diff] [blame] | 2580 | if (!kref_get_unless_zero(&se_cmd->cmd_kref)) |
| 2581 | return -EINVAL; |
| 2582 | |
Nicholas Bellinger | 527268d | 2016-10-04 16:37:05 -0700 | [diff] [blame] | 2583 | se_cmd->se_cmd_flags |= SCF_ACK_KREF; |
| 2584 | } |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2585 | |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2586 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
Roland Dreier | bc187ea | 2012-07-16 11:04:40 -0700 | [diff] [blame] | 2587 | if (se_sess->sess_tearing_down) { |
| 2588 | ret = -ESHUTDOWN; |
| 2589 | goto out; |
| 2590 | } |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2591 | list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); |
Roland Dreier | bc187ea | 2012-07-16 11:04:40 -0700 | [diff] [blame] | 2592 | out: |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2593 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
Bart Van Assche | 7544e597 | 2015-02-18 15:33:58 +0100 | [diff] [blame] | 2594 | |
| 2595 | if (ret && ack_kref) |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 2596 | target_put_sess_cmd(se_cmd); |
Bart Van Assche | 7544e597 | 2015-02-18 15:33:58 +0100 | [diff] [blame] | 2597 | |
Roland Dreier | bc187ea | 2012-07-16 11:04:40 -0700 | [diff] [blame] | 2598 | return ret; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2599 | } |
Nicholas Bellinger | 20361e6 | 2013-03-21 22:54:28 -0700 | [diff] [blame] | 2600 | EXPORT_SYMBOL(target_get_sess_cmd); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2601 | |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2602 | static void target_free_cmd_mem(struct se_cmd *cmd) |
| 2603 | { |
| 2604 | transport_free_pages(cmd); |
| 2605 | |
| 2606 | if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
| 2607 | core_tmr_release_req(cmd->se_tmr_req); |
| 2608 | if (cmd->t_task_cdb != cmd->__t_task_cdb) |
| 2609 | kfree(cmd->t_task_cdb); |
| 2610 | } |
| 2611 | |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2612 | static void target_release_cmd_kref(struct kref *kref) |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2613 | { |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2614 | struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); |
| 2615 | struct se_session *se_sess = se_cmd->se_sess; |
Bart Van Assche | 9ff9d15 | 2015-10-22 15:57:04 -0700 | [diff] [blame] | 2616 | unsigned long flags; |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2617 | bool fabric_stop; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2618 | |
Bart Van Assche | 9ff9d15 | 2015-10-22 15:57:04 -0700 | [diff] [blame] | 2619 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2620 | |
| 2621 | spin_lock(&se_cmd->t_state_lock); |
Nicholas Bellinger | 064cdd2 | 2016-06-02 14:56:45 -0700 | [diff] [blame] | 2622 | fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) && |
| 2623 | (se_cmd->transport_state & CMD_T_ABORTED); |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2624 | spin_unlock(&se_cmd->t_state_lock); |
| 2625 | |
| 2626 | if (se_cmd->cmd_wait_set || fabric_stop) { |
| 2627 | list_del_init(&se_cmd->se_cmd_list); |
Bart Van Assche | 9ff9d15 | 2015-10-22 15:57:04 -0700 | [diff] [blame] | 2628 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2629 | target_free_cmd_mem(se_cmd); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2630 | complete(&se_cmd->cmd_wait_comp); |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2631 | return; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2632 | } |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2633 | list_del_init(&se_cmd->se_cmd_list); |
Bart Van Assche | 9ff9d15 | 2015-10-22 15:57:04 -0700 | [diff] [blame] | 2634 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2635 | |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2636 | target_free_cmd_mem(se_cmd); |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2637 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2638 | } |
| 2639 | |
| 2640 | /* target_put_sess_cmd - Check for active I/O shutdown via kref_put |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2641 | * @se_cmd: command descriptor to drop |
| 2642 | */ |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 2643 | int target_put_sess_cmd(struct se_cmd *se_cmd) |
Nicholas Bellinger | 7481deb | 2011-11-12 00:32:17 -0800 | [diff] [blame] | 2644 | { |
Bart Van Assche | afc1660 | 2015-04-27 13:52:36 +0200 | [diff] [blame] | 2645 | struct se_session *se_sess = se_cmd->se_sess; |
| 2646 | |
Nicholas Bellinger | 0ed6e18 | 2014-06-12 12:45:02 -0700 | [diff] [blame] | 2647 | if (!se_sess) { |
Nicholas Bellinger | febe562 | 2016-01-11 21:31:09 -0800 | [diff] [blame] | 2648 | target_free_cmd_mem(se_cmd); |
Nicholas Bellinger | 0ed6e18 | 2014-06-12 12:45:02 -0700 | [diff] [blame] | 2649 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2650 | return 1; |
| 2651 | } |
Bart Van Assche | 9ff9d15 | 2015-10-22 15:57:04 -0700 | [diff] [blame] | 2652 | return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2653 | } |
| 2654 | EXPORT_SYMBOL(target_put_sess_cmd); |
| 2655 | |
Roland Dreier | 1c7b13f | 2012-07-16 11:04:42 -0700 | [diff] [blame] | 2656 | /* target_sess_cmd_list_set_waiting - Flag all commands in |
| 2657 | * sess_cmd_list to complete cmd_wait_comp. Set |
| 2658 | * sess_tearing_down so no more commands are queued. |
| 2659 | * @se_sess: session to flag |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2660 | */ |
Roland Dreier | 1c7b13f | 2012-07-16 11:04:42 -0700 | [diff] [blame] | 2661 | void target_sess_cmd_list_set_waiting(struct se_session *se_sess) |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2662 | { |
Hannes Reinecke | 1b4c59b | 2016-08-22 10:54:07 +0200 | [diff] [blame] | 2663 | struct se_cmd *se_cmd, *tmp_cmd; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2664 | unsigned long flags; |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2665 | int rc; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2666 | |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2667 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 2668 | if (se_sess->sess_tearing_down) { |
| 2669 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2670 | return; |
| 2671 | } |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2672 | se_sess->sess_tearing_down = 1; |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 2673 | list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2674 | |
Hannes Reinecke | 1b4c59b | 2016-08-22 10:54:07 +0200 | [diff] [blame] | 2675 | list_for_each_entry_safe(se_cmd, tmp_cmd, |
| 2676 | &se_sess->sess_wait_list, se_cmd_list) { |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2677 | rc = kref_get_unless_zero(&se_cmd->cmd_kref); |
| 2678 | if (rc) { |
| 2679 | se_cmd->cmd_wait_set = 1; |
| 2680 | spin_lock(&se_cmd->t_state_lock); |
| 2681 | se_cmd->transport_state |= CMD_T_FABRIC_STOP; |
| 2682 | spin_unlock(&se_cmd->t_state_lock); |
Hannes Reinecke | 1b4c59b | 2016-08-22 10:54:07 +0200 | [diff] [blame] | 2683 | } else |
| 2684 | list_del_init(&se_cmd->se_cmd_list); |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2685 | } |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2686 | |
| 2687 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2688 | } |
Roland Dreier | 1c7b13f | 2012-07-16 11:04:42 -0700 | [diff] [blame] | 2689 | EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2690 | |
| 2691 | /* target_wait_for_sess_cmds - Wait for outstanding descriptors |
| 2692 | * @se_sess: session to wait for active I/O |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2693 | */ |
Joern Engel | be646c2d | 2013-05-15 00:44:07 -0700 | [diff] [blame] | 2694 | void target_wait_for_sess_cmds(struct se_session *se_sess) |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2695 | { |
| 2696 | struct se_cmd *se_cmd, *tmp_cmd; |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 2697 | unsigned long flags; |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2698 | bool tas; |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2699 | |
| 2700 | list_for_each_entry_safe(se_cmd, tmp_cmd, |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 2701 | &se_sess->sess_wait_list, se_cmd_list) { |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2702 | pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" |
| 2703 | " %d\n", se_cmd, se_cmd->t_state, |
| 2704 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
| 2705 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2706 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); |
| 2707 | tas = (se_cmd->transport_state & CMD_T_TAS); |
| 2708 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); |
| 2709 | |
| 2710 | if (!target_put_sess_cmd(se_cmd)) { |
| 2711 | if (tas) |
| 2712 | target_put_sess_cmd(se_cmd); |
| 2713 | } |
| 2714 | |
Joern Engel | be646c2d | 2013-05-15 00:44:07 -0700 | [diff] [blame] | 2715 | wait_for_completion(&se_cmd->cmd_wait_comp); |
| 2716 | pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" |
| 2717 | " fabric state: %d\n", se_cmd, se_cmd->t_state, |
| 2718 | se_cmd->se_tfo->get_cmd_state(se_cmd)); |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2719 | |
| 2720 | se_cmd->se_tfo->release_cmd(se_cmd); |
| 2721 | } |
Nicholas Bellinger | 9b31a32 | 2013-05-15 00:52:44 -0700 | [diff] [blame] | 2722 | |
| 2723 | spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); |
| 2724 | WARN_ON(!list_empty(&se_sess->sess_cmd_list)); |
| 2725 | spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); |
| 2726 | |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2727 | } |
| 2728 | EXPORT_SYMBOL(target_wait_for_sess_cmds); |
| 2729 | |
Nicholas Bellinger | 17ea11d5 | 2017-02-22 22:06:32 -0800 | [diff] [blame] | 2730 | static void target_lun_confirm(struct percpu_ref *ref) |
| 2731 | { |
| 2732 | struct se_lun *lun = container_of(ref, struct se_lun, lun_ref); |
| 2733 | |
| 2734 | complete(&lun->lun_ref_comp); |
| 2735 | } |
| 2736 | |
Bart Van Assche | b3eeea6 | 2015-05-19 16:16:01 +0200 | [diff] [blame] | 2737 | void transport_clear_lun_ref(struct se_lun *lun) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2738 | { |
Nicholas Bellinger | 17ea11d5 | 2017-02-22 22:06:32 -0800 | [diff] [blame] | 2739 | /* |
| 2740 | * Mark the percpu-ref as DEAD, switch to atomic_t mode, drop |
| 2741 | * the initial reference and schedule confirm kill to be |
| 2742 | * executed after one full RCU grace period has completed. |
| 2743 | */ |
| 2744 | percpu_ref_kill_and_confirm(&lun->lun_ref, target_lun_confirm); |
| 2745 | /* |
| 2746 | * The first completion waits for percpu_ref_switch_to_atomic_rcu() |
| 2747 | * to call target_lun_confirm after lun->lun_ref has been marked |
| 2748 | * as __PERCPU_REF_DEAD on all CPUs, and switches to atomic_t |
| 2749 | * mode so that percpu_ref_tryget_live() lookup of lun->lun_ref |
| 2750 | * fails for all new incoming I/O. |
| 2751 | */ |
Nicholas Bellinger | 5277797 | 2013-11-06 21:03:43 -0800 | [diff] [blame] | 2752 | wait_for_completion(&lun->lun_ref_comp); |
Nicholas Bellinger | 17ea11d5 | 2017-02-22 22:06:32 -0800 | [diff] [blame] | 2753 | /* |
| 2754 | * The second completion waits for percpu_ref_put_many() to |
| 2755 | * invoke ->release() after lun->lun_ref has switched to |
| 2756 | * atomic_t mode, and lun->lun_ref.count has reached zero. |
| 2757 | * |
| 2758 | * At this point all target-core lun->lun_ref references have |
| 2759 | * been dropped via transport_lun_remove_cmd(), and it's safe |
| 2760 | * to proceed with the remaining LUN shutdown. |
| 2761 | */ |
| 2762 | wait_for_completion(&lun->lun_shutdown_comp); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2763 | } |
| 2764 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2765 | static bool |
| 2766 | __transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop, |
| 2767 | bool *aborted, bool *tas, unsigned long *flags) |
| 2768 | __releases(&cmd->t_state_lock) |
| 2769 | __acquires(&cmd->t_state_lock) |
| 2770 | { |
| 2771 | |
| 2772 | assert_spin_locked(&cmd->t_state_lock); |
| 2773 | WARN_ON_ONCE(!irqs_disabled()); |
| 2774 | |
| 2775 | if (fabric_stop) |
| 2776 | cmd->transport_state |= CMD_T_FABRIC_STOP; |
| 2777 | |
| 2778 | if (cmd->transport_state & CMD_T_ABORTED) |
| 2779 | *aborted = true; |
| 2780 | |
| 2781 | if (cmd->transport_state & CMD_T_TAS) |
| 2782 | *tas = true; |
| 2783 | |
| 2784 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && |
| 2785 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
| 2786 | return false; |
| 2787 | |
| 2788 | if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && |
| 2789 | !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) |
| 2790 | return false; |
| 2791 | |
| 2792 | if (!(cmd->transport_state & CMD_T_ACTIVE)) |
| 2793 | return false; |
| 2794 | |
| 2795 | if (fabric_stop && *aborted) |
| 2796 | return false; |
| 2797 | |
| 2798 | cmd->transport_state |= CMD_T_STOP; |
| 2799 | |
| 2800 | pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d," |
| 2801 | " t_state: %d, CMD_T_STOP\n", cmd, cmd->tag, |
| 2802 | cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); |
| 2803 | |
| 2804 | spin_unlock_irqrestore(&cmd->t_state_lock, *flags); |
| 2805 | |
| 2806 | wait_for_completion(&cmd->t_transport_stop_comp); |
| 2807 | |
| 2808 | spin_lock_irqsave(&cmd->t_state_lock, *flags); |
| 2809 | cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); |
| 2810 | |
| 2811 | pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->" |
| 2812 | "t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag); |
| 2813 | |
| 2814 | return true; |
| 2815 | } |
| 2816 | |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2817 | /** |
| 2818 | * transport_wait_for_tasks - wait for completion to occur |
| 2819 | * @cmd: command to wait |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2820 | * |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2821 | * Called from frontend fabric context to wait for storage engine |
| 2822 | * to pause and/or release frontend generated struct se_cmd. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2823 | */ |
Nicholas Bellinger | a17f091 | 2011-11-02 21:52:08 -0700 | [diff] [blame] | 2824 | bool transport_wait_for_tasks(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2825 | { |
| 2826 | unsigned long flags; |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2827 | bool ret, aborted = false, tas = false; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2828 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2829 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2830 | ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2831 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2832 | |
Nicholas Bellinger | 0f4a943 | 2016-01-19 15:23:02 -0800 | [diff] [blame] | 2833 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2834 | } |
Nicholas Bellinger | d14921d | 2011-10-09 01:00:58 -0700 | [diff] [blame] | 2835 | EXPORT_SYMBOL(transport_wait_for_tasks); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2836 | |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2837 | struct sense_info { |
| 2838 | u8 key; |
| 2839 | u8 asc; |
| 2840 | u8 ascq; |
| 2841 | bool add_sector_info; |
| 2842 | }; |
| 2843 | |
| 2844 | static const struct sense_info sense_info_table[] = { |
| 2845 | [TCM_NO_SENSE] = { |
| 2846 | .key = NOT_READY |
| 2847 | }, |
| 2848 | [TCM_NON_EXISTENT_LUN] = { |
| 2849 | .key = ILLEGAL_REQUEST, |
| 2850 | .asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */ |
| 2851 | }, |
| 2852 | [TCM_UNSUPPORTED_SCSI_OPCODE] = { |
| 2853 | .key = ILLEGAL_REQUEST, |
| 2854 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ |
| 2855 | }, |
| 2856 | [TCM_SECTOR_COUNT_TOO_MANY] = { |
| 2857 | .key = ILLEGAL_REQUEST, |
| 2858 | .asc = 0x20, /* INVALID COMMAND OPERATION CODE */ |
| 2859 | }, |
| 2860 | [TCM_UNKNOWN_MODE_PAGE] = { |
| 2861 | .key = ILLEGAL_REQUEST, |
| 2862 | .asc = 0x24, /* INVALID FIELD IN CDB */ |
| 2863 | }, |
| 2864 | [TCM_CHECK_CONDITION_ABORT_CMD] = { |
| 2865 | .key = ABORTED_COMMAND, |
| 2866 | .asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */ |
| 2867 | .ascq = 0x03, |
| 2868 | }, |
| 2869 | [TCM_INCORRECT_AMOUNT_OF_DATA] = { |
| 2870 | .key = ABORTED_COMMAND, |
| 2871 | .asc = 0x0c, /* WRITE ERROR */ |
| 2872 | .ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */ |
| 2873 | }, |
| 2874 | [TCM_INVALID_CDB_FIELD] = { |
| 2875 | .key = ILLEGAL_REQUEST, |
| 2876 | .asc = 0x24, /* INVALID FIELD IN CDB */ |
| 2877 | }, |
| 2878 | [TCM_INVALID_PARAMETER_LIST] = { |
| 2879 | .key = ILLEGAL_REQUEST, |
| 2880 | .asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */ |
| 2881 | }, |
| 2882 | [TCM_PARAMETER_LIST_LENGTH_ERROR] = { |
| 2883 | .key = ILLEGAL_REQUEST, |
| 2884 | .asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */ |
| 2885 | }, |
| 2886 | [TCM_UNEXPECTED_UNSOLICITED_DATA] = { |
| 2887 | .key = ILLEGAL_REQUEST, |
| 2888 | .asc = 0x0c, /* WRITE ERROR */ |
| 2889 | .ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */ |
| 2890 | }, |
| 2891 | [TCM_SERVICE_CRC_ERROR] = { |
| 2892 | .key = ABORTED_COMMAND, |
| 2893 | .asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */ |
| 2894 | .ascq = 0x05, /* N/A */ |
| 2895 | }, |
| 2896 | [TCM_SNACK_REJECTED] = { |
| 2897 | .key = ABORTED_COMMAND, |
| 2898 | .asc = 0x11, /* READ ERROR */ |
| 2899 | .ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */ |
| 2900 | }, |
| 2901 | [TCM_WRITE_PROTECTED] = { |
| 2902 | .key = DATA_PROTECT, |
| 2903 | .asc = 0x27, /* WRITE PROTECTED */ |
| 2904 | }, |
| 2905 | [TCM_ADDRESS_OUT_OF_RANGE] = { |
| 2906 | .key = ILLEGAL_REQUEST, |
| 2907 | .asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ |
| 2908 | }, |
| 2909 | [TCM_CHECK_CONDITION_UNIT_ATTENTION] = { |
| 2910 | .key = UNIT_ATTENTION, |
| 2911 | }, |
| 2912 | [TCM_CHECK_CONDITION_NOT_READY] = { |
| 2913 | .key = NOT_READY, |
| 2914 | }, |
| 2915 | [TCM_MISCOMPARE_VERIFY] = { |
| 2916 | .key = MISCOMPARE, |
| 2917 | .asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */ |
| 2918 | .ascq = 0x00, |
| 2919 | }, |
| 2920 | [TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = { |
Sagi Grimberg | 734ca5c | 2015-07-08 17:58:54 +0300 | [diff] [blame] | 2921 | .key = ABORTED_COMMAND, |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2922 | .asc = 0x10, |
| 2923 | .ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */ |
| 2924 | .add_sector_info = true, |
| 2925 | }, |
| 2926 | [TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = { |
Sagi Grimberg | 734ca5c | 2015-07-08 17:58:54 +0300 | [diff] [blame] | 2927 | .key = ABORTED_COMMAND, |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2928 | .asc = 0x10, |
| 2929 | .ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ |
| 2930 | .add_sector_info = true, |
| 2931 | }, |
| 2932 | [TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = { |
Sagi Grimberg | 734ca5c | 2015-07-08 17:58:54 +0300 | [diff] [blame] | 2933 | .key = ABORTED_COMMAND, |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2934 | .asc = 0x10, |
| 2935 | .ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ |
| 2936 | .add_sector_info = true, |
| 2937 | }, |
Nicholas Bellinger | 449a137 | 2016-10-08 17:26:44 -0700 | [diff] [blame] | 2938 | [TCM_COPY_TARGET_DEVICE_NOT_REACHABLE] = { |
| 2939 | .key = COPY_ABORTED, |
| 2940 | .asc = 0x0d, |
| 2941 | .ascq = 0x02, /* COPY TARGET DEVICE NOT REACHABLE */ |
| 2942 | |
| 2943 | }, |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2944 | [TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = { |
| 2945 | /* |
| 2946 | * Returning ILLEGAL REQUEST would cause immediate IO errors on |
| 2947 | * Solaris initiators. Returning NOT READY instead means the |
| 2948 | * operations will be retried a finite number of times and we |
| 2949 | * can survive intermittent errors. |
| 2950 | */ |
| 2951 | .key = NOT_READY, |
| 2952 | .asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */ |
| 2953 | }, |
| 2954 | }; |
| 2955 | |
Sagi Grimberg | f5a8b3a | 2015-07-15 10:55:37 +0300 | [diff] [blame] | 2956 | static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason) |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2957 | { |
| 2958 | const struct sense_info *si; |
| 2959 | u8 *buffer = cmd->sense_buffer; |
| 2960 | int r = (__force int)reason; |
| 2961 | u8 asc, ascq; |
Sagi Grimberg | 4e4937e | 2015-07-16 10:28:05 +0300 | [diff] [blame] | 2962 | bool desc_format = target_sense_desc_format(cmd->se_dev); |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2963 | |
| 2964 | if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key) |
| 2965 | si = &sense_info_table[r]; |
| 2966 | else |
| 2967 | si = &sense_info_table[(__force int) |
| 2968 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE]; |
| 2969 | |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2970 | if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) { |
| 2971 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); |
| 2972 | WARN_ON_ONCE(asc == 0); |
| 2973 | } else if (si->asc == 0) { |
| 2974 | WARN_ON_ONCE(cmd->scsi_asc == 0); |
| 2975 | asc = cmd->scsi_asc; |
| 2976 | ascq = cmd->scsi_ascq; |
| 2977 | } else { |
| 2978 | asc = si->asc; |
| 2979 | ascq = si->ascq; |
| 2980 | } |
Sagi Grimberg | 9ec1e1c | 2015-07-08 17:58:53 +0300 | [diff] [blame] | 2981 | |
Sagi Grimberg | 4e4937e | 2015-07-16 10:28:05 +0300 | [diff] [blame] | 2982 | scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq); |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2983 | if (si->add_sector_info) |
Sagi Grimberg | f5a8b3a | 2015-07-15 10:55:37 +0300 | [diff] [blame] | 2984 | return scsi_set_sense_information(buffer, |
| 2985 | cmd->scsi_sense_length, |
| 2986 | cmd->bad_sector); |
| 2987 | |
| 2988 | return 0; |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 2989 | } |
| 2990 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 2991 | int |
| 2992 | transport_send_check_condition_and_sense(struct se_cmd *cmd, |
| 2993 | sense_reason_t reason, int from_transport) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2994 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2995 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2996 | |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2997 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2998 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 2999 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3000 | return 0; |
| 3001 | } |
| 3002 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 3003 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3004 | |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 3005 | if (!from_transport) { |
Sagi Grimberg | f5a8b3a | 2015-07-15 10:55:37 +0300 | [diff] [blame] | 3006 | int rc; |
| 3007 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3008 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
Bart Van Assche | ab78fef | 2015-07-08 17:58:51 +0300 | [diff] [blame] | 3009 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
| 3010 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; |
Sagi Grimberg | f5a8b3a | 2015-07-15 10:55:37 +0300 | [diff] [blame] | 3011 | rc = translate_sense_reason(cmd, reason); |
| 3012 | if (rc) |
| 3013 | return rc; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3014 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3015 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 3016 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 07bde79 | 2011-06-13 14:46:09 -0700 | [diff] [blame] | 3017 | return cmd->se_tfo->queue_status(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3018 | } |
| 3019 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); |
| 3020 | |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3021 | static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
| 3022 | __releases(&cmd->t_state_lock) |
| 3023 | __acquires(&cmd->t_state_lock) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3024 | { |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3025 | assert_spin_locked(&cmd->t_state_lock); |
| 3026 | WARN_ON_ONCE(!irqs_disabled()); |
| 3027 | |
Roland Dreier | c18bc7d | 2012-11-16 08:06:19 -0800 | [diff] [blame] | 3028 | if (!(cmd->transport_state & CMD_T_ABORTED)) |
| 3029 | return 0; |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 3030 | /* |
| 3031 | * If cmd has been aborted but either no status is to be sent or it has |
| 3032 | * already been sent, just return |
| 3033 | */ |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3034 | if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) { |
| 3035 | if (send_status) |
| 3036 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
Roland Dreier | c18bc7d | 2012-11-16 08:06:19 -0800 | [diff] [blame] | 3037 | return 1; |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3038 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 3039 | |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3040 | pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:" |
| 3041 | " 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 3042 | |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 3043 | cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; |
Nicholas Bellinger | 29f4c09 | 2013-11-13 14:39:14 -0800 | [diff] [blame] | 3044 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 3045 | trace_target_cmd_complete(cmd); |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3046 | |
| 3047 | spin_unlock_irq(&cmd->t_state_lock); |
Roland Dreier | c18bc7d | 2012-11-16 08:06:19 -0800 | [diff] [blame] | 3048 | cmd->se_tfo->queue_status(cmd); |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3049 | spin_lock_irq(&cmd->t_state_lock); |
Roland Dreier | c18bc7d | 2012-11-16 08:06:19 -0800 | [diff] [blame] | 3050 | |
| 3051 | return 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3052 | } |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3053 | |
| 3054 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
| 3055 | { |
| 3056 | int ret; |
| 3057 | |
| 3058 | spin_lock_irq(&cmd->t_state_lock); |
| 3059 | ret = __transport_check_aborted_status(cmd, send_status); |
| 3060 | spin_unlock_irq(&cmd->t_state_lock); |
| 3061 | |
| 3062 | return ret; |
| 3063 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3064 | EXPORT_SYMBOL(transport_check_aborted_status); |
| 3065 | |
| 3066 | void transport_send_task_abort(struct se_cmd *cmd) |
| 3067 | { |
Nicholas Bellinger | c252f00 | 2011-09-29 14:22:13 -0700 | [diff] [blame] | 3068 | unsigned long flags; |
| 3069 | |
| 3070 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 3071 | if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { |
Nicholas Bellinger | c252f00 | 2011-09-29 14:22:13 -0700 | [diff] [blame] | 3072 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3073 | return; |
| 3074 | } |
| 3075 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3076 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3077 | /* |
| 3078 | * If there are still expected incoming fabric WRITEs, we wait |
| 3079 | * until until they have completed before sending a TASK_ABORTED |
| 3080 | * response. This response with TASK_ABORTED status will be |
| 3081 | * queued back to fabric module by transport_check_aborted_status(). |
| 3082 | */ |
| 3083 | if (cmd->data_direction == DMA_TO_DEVICE) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 3084 | if (cmd->se_tfo->write_pending_status(cmd) != 0) { |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3085 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 3086 | if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) { |
| 3087 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3088 | goto send_abort; |
| 3089 | } |
Alex Leung | 68259b5 | 2014-03-21 22:20:41 -0700 | [diff] [blame] | 3090 | cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3091 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
Nicholas Bellinger | 29f4c09 | 2013-11-13 14:39:14 -0800 | [diff] [blame] | 3092 | return; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3093 | } |
| 3094 | } |
Nicholas Bellinger | 310d3d3 | 2016-02-05 14:51:36 -0800 | [diff] [blame] | 3095 | send_abort: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3096 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 3097 | |
Roland Dreier | 72b59d6e | 2013-01-02 12:47:58 -0800 | [diff] [blame] | 3098 | transport_lun_remove_cmd(cmd); |
| 3099 | |
Bart Van Assche | 649ee05 | 2015-04-14 13:26:44 +0200 | [diff] [blame] | 3100 | pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n", |
| 3101 | cmd->t_task_cdb[0], cmd->tag); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 3102 | |
Roland Dreier | e5c0d6a | 2013-06-26 17:36:17 -0700 | [diff] [blame] | 3103 | trace_target_cmd_complete(cmd); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 3104 | cmd->se_tfo->queue_status(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3105 | } |
| 3106 | |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 3107 | static void target_tmr_work(struct work_struct *work) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3108 | { |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 3109 | struct se_cmd *cmd = container_of(work, struct se_cmd, work); |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 3110 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3111 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
Nicholas Bellinger | a6d9bb1 | 2016-01-11 21:53:05 -0800 | [diff] [blame] | 3112 | unsigned long flags; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3113 | int ret; |
| 3114 | |
Nicholas Bellinger | a6d9bb1 | 2016-01-11 21:53:05 -0800 | [diff] [blame] | 3115 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 3116 | if (cmd->transport_state & CMD_T_ABORTED) { |
| 3117 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3118 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3119 | goto check_stop; |
| 3120 | } |
| 3121 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3122 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3123 | switch (tmr->function) { |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 3124 | case TMR_ABORT_TASK: |
Nicholas Bellinger | 3d28934 | 2012-02-13 02:38:14 -0800 | [diff] [blame] | 3125 | core_tmr_abort_task(dev, tmr, cmd->se_sess); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3126 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 3127 | case TMR_ABORT_TASK_SET: |
| 3128 | case TMR_CLEAR_ACA: |
| 3129 | case TMR_CLEAR_TASK_SET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3130 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
| 3131 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 3132 | case TMR_LUN_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3133 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
| 3134 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : |
| 3135 | TMR_FUNCTION_REJECTED; |
Hannes Reinecke | b5aafb1 | 2015-06-11 10:01:28 +0200 | [diff] [blame] | 3136 | if (tmr->response == TMR_FUNCTION_COMPLETE) { |
| 3137 | target_ua_allocate_lun(cmd->se_sess->se_node_acl, |
| 3138 | cmd->orig_fe_lun, 0x29, |
| 3139 | ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED); |
| 3140 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3141 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 3142 | case TMR_TARGET_WARM_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3143 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3144 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 3145 | case TMR_TARGET_COLD_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3146 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3147 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3148 | default: |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 3149 | pr_err("Uknown TMR function: 0x%02x.\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3150 | tmr->function); |
| 3151 | tmr->response = TMR_FUNCTION_REJECTED; |
| 3152 | break; |
| 3153 | } |
| 3154 | |
Nicholas Bellinger | a6d9bb1 | 2016-01-11 21:53:05 -0800 | [diff] [blame] | 3155 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
| 3156 | if (cmd->transport_state & CMD_T_ABORTED) { |
| 3157 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3158 | goto check_stop; |
| 3159 | } |
Nicholas Bellinger | a6d9bb1 | 2016-01-11 21:53:05 -0800 | [diff] [blame] | 3160 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3161 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 3162 | cmd->se_tfo->queue_tm_rsp(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3163 | |
Nicholas Bellinger | a6d9bb1 | 2016-01-11 21:53:05 -0800 | [diff] [blame] | 3164 | check_stop: |
Christoph Hellwig | b7b8bef | 2011-10-17 13:56:44 -0400 | [diff] [blame] | 3165 | transport_cmd_check_stop_to_fabric(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3166 | } |
| 3167 | |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 3168 | int transport_generic_handle_tmr( |
| 3169 | struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3170 | { |
Nicholas Bellinger | f15e9cd | 2014-06-09 23:13:20 +0000 | [diff] [blame] | 3171 | unsigned long flags; |
Nicholas Bellinger | 88e865c | 2016-12-06 22:45:46 -0800 | [diff] [blame] | 3172 | bool aborted = false; |
Nicholas Bellinger | f15e9cd | 2014-06-09 23:13:20 +0000 | [diff] [blame] | 3173 | |
| 3174 | spin_lock_irqsave(&cmd->t_state_lock, flags); |
Nicholas Bellinger | 88e865c | 2016-12-06 22:45:46 -0800 | [diff] [blame] | 3175 | if (cmd->transport_state & CMD_T_ABORTED) { |
| 3176 | aborted = true; |
| 3177 | } else { |
| 3178 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; |
| 3179 | cmd->transport_state |= CMD_T_ACTIVE; |
| 3180 | } |
Nicholas Bellinger | f15e9cd | 2014-06-09 23:13:20 +0000 | [diff] [blame] | 3181 | spin_unlock_irqrestore(&cmd->t_state_lock, flags); |
| 3182 | |
Nicholas Bellinger | 88e865c | 2016-12-06 22:45:46 -0800 | [diff] [blame] | 3183 | if (aborted) { |
| 3184 | pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d" |
| 3185 | "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function, |
| 3186 | cmd->se_tmr_req->ref_task_tag, cmd->tag); |
| 3187 | transport_cmd_check_stop_to_fabric(cmd); |
| 3188 | return 0; |
| 3189 | } |
| 3190 | |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 3191 | INIT_WORK(&cmd->work, target_tmr_work); |
| 3192 | queue_work(cmd->se_dev->tmr_wq, &cmd->work); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3193 | return 0; |
| 3194 | } |
Christoph Hellwig | af87729 | 2012-07-08 15:58:49 -0400 | [diff] [blame] | 3195 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
Christoph Hellwig | 814e5b4 | 2015-04-20 15:00:30 +0200 | [diff] [blame] | 3196 | |
| 3197 | bool |
| 3198 | target_check_wce(struct se_device *dev) |
| 3199 | { |
| 3200 | bool wce = false; |
| 3201 | |
| 3202 | if (dev->transport->get_write_cache) |
| 3203 | wce = dev->transport->get_write_cache(dev); |
| 3204 | else if (dev->dev_attrib.emulate_write_cache > 0) |
| 3205 | wce = true; |
| 3206 | |
| 3207 | return wce; |
| 3208 | } |
| 3209 | |
| 3210 | bool |
| 3211 | target_check_fua(struct se_device *dev) |
| 3212 | { |
| 3213 | return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0; |
| 3214 | } |