[SCSI] iscsi: increment expstatsn during login
debugged by Ming and Rohan:
The problem Ming and Rohan debugged was that during a normal session
login, open-iscsi is not incrementing the exp_statsn counter. It was
stuck at zero. From the RFC, it looks like if the login response PDU has
a successful status then we should be incrementing that value. Also from
the RFC, it looks like if when we drop a connection then reconnect, we
should be using the exp_statsn from the old connection in the next
relogin attempt.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index a99f2ef..4750d48 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -333,15 +333,21 @@
debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
opcode, conn->id, mtask->itt, datalen);
+ rc = iscsi_check_assign_cmdsn(session,
+ (struct iscsi_nopin*)hdr);
+ if (rc)
+ goto done;
+
switch(opcode) {
+ case ISCSI_OP_LOGOUT_RSP:
+ conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
+ /* fall through */
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGOUT_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
-
+ /*
+ * login related PDU's exp_statsn is handled in
+ * userspace
+ */
rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
list_del(&mtask->running);
if (conn->login_mtask != mtask)
@@ -349,15 +355,12 @@
(void*)&mtask, sizeof(void*));
break;
case ISCSI_OP_SCSI_TMFUNC_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
-
if (datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
+
+ conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
conn->tmfrsp_pdus_cnt++;
if (conn->tmabort_state == TMABORT_INITIAL) {
conn->tmabort_state =
@@ -373,10 +376,6 @@
rc = ISCSI_ERR_PROTO;
break;
}
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
@@ -404,6 +403,7 @@
case ISCSI_OP_REJECT:
/* we need sth like iscsi_reject_rsp()*/
case ISCSI_OP_ASYNC_EVENT:
+ conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
/* we need sth like iscsi_async_event_rsp() */
rc = ISCSI_ERR_BAD_OPCODE;
break;
@@ -414,6 +414,7 @@
} else
rc = ISCSI_ERR_BAD_ITT;
+done:
return rc;
}
EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
@@ -730,6 +731,7 @@
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
+ nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
if (!__kfifo_get(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*))) {
spin_unlock_bh(&session->lock);
@@ -738,7 +740,7 @@
}
/*
- * pre-format CmdSN and ExpStatSN for outgoing PDU.
+ * pre-format CmdSN for outgoing PDU.
*/
if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
@@ -751,8 +753,6 @@
/* do not advance CmdSN */
nop->cmdsn = cpu_to_be32(session->cmdsn);
- nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
-
if (data_size) {
memcpy(mtask->data, data, data_size);
mtask->data_count = data_size;
@@ -1647,7 +1647,7 @@
case STOP_CONN_RECOVER:
case STOP_CONN_TERM:
iscsi_start_session_recovery(session, conn, flag);
- return;
+ break;
case STOP_CONN_SUSPEND:
if (session->tt->suspend_conn_recv)
session->tt->suspend_conn_recv(conn);