firewire: fw-sbp2: Use sbp2 device-provided mgt orb timeout for logins
To be more compliant with section 7.4.8 of the SBP-2 specification,
use the mgt_ORB_timeout specified in the SBP-2 device's config rom
for login ORB attempts (though with some sanity checks). A happy
side-effect is that certain device and controller combinations that
sometimes take more than 20 seconds to get synced up (like my laptop
with just about any SBP-2 device) now function more reliably.
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (silenced sparse)
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 794bade..19ece9b 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -149,15 +149,17 @@
unsigned workarounds;
struct list_head lu_list;
+
+ unsigned int mgt_orb_timeout;
};
/*
* Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
- * provided in the config rom. A high timeout value really only matters
- * on initial login, where we'll just use 20s rather than hassling with
- * reading the config rom, since it really wouldn't buy us much.
+ * provided in the config rom. Most devices do provide a value, which
+ * we'll use for login management orbs, but with some sane limits.
*/
-#define SBP2_LOGIN_ORB_TIMEOUT 20000 /* Timeout in ms */
+#define SBP2_MIN_LOGIN_ORB_TIMEOUT 5000U /* Timeout in ms */
+#define SBP2_MAX_LOGIN_ORB_TIMEOUT 40000U /* Timeout in ms */
#define SBP2_ORB_TIMEOUT 2000 /* Timeout in ms */
#define SBP2_ORB_NULL 0x80000000
#define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
@@ -166,6 +168,7 @@
#define SBP2_DIRECTION_FROM_MEDIA 0x1
/* Unit directory keys */
+#define SBP2_CSR_UNIT_CHARACTERISTICS 0x3a
#define SBP2_CSR_FIRMWARE_REVISION 0x3c
#define SBP2_CSR_LOGICAL_UNIT_NUMBER 0x14
#define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
@@ -527,7 +530,7 @@
orb->request.misc |=
MANAGEMENT_ORB_RECONNECT(2) |
MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login);
- timeout = SBP2_LOGIN_ORB_TIMEOUT;
+ timeout = lu->tgt->mgt_orb_timeout;
} else {
timeout = SBP2_ORB_TIMEOUT;
}
@@ -777,6 +780,7 @@
{
struct fw_csr_iterator ci;
int key, value;
+ unsigned int timeout;
fw_csr_iterator_init(&ci, directory);
while (fw_csr_iterator_next(&ci, &key, &value)) {
@@ -799,6 +803,21 @@
*firmware_revision = value;
break;
+ case SBP2_CSR_UNIT_CHARACTERISTICS:
+ /* the timeout value is stored in 500ms units */
+ timeout = ((unsigned int) value >> 8 & 0xff) * 500;
+ timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
+ tgt->mgt_orb_timeout =
+ min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
+
+ if (timeout > tgt->mgt_orb_timeout)
+ fw_notify("%s: config rom contains %ds "
+ "management ORB timeout, limiting "
+ "to %ds\n", tgt->unit->device.bus_id,
+ timeout / 1000,
+ tgt->mgt_orb_timeout / 1000);
+ break;
+
case SBP2_CSR_LOGICAL_UNIT_NUMBER:
if (sbp2_add_logical_unit(tgt, value) < 0)
return -ENOMEM;