scsi: devinfo: add BLIST_RETRY_ITF for EMC Symmetrix

EMC Symmetrix returns 'internal target error' for a variety of
conditions, most of which will be transient.  So we should always retry
it, even with failfast set.  Otherwise we'd get spurious path flaps with
multipath.

Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 9603f3e..87bc506 100644 (file)
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -161,7 +161,8 @@ static struct {
        {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* EMC CLARiiON, storage on LUN 0 */
        {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* EMC CLARiiON, no storage on LUN 0 */
        {"EMC",  "Invista", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
-       {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_REPORTLUN2},
+       {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
+        BLIST_REPORTLUN2 | BLIST_RETRY_ITF},
        {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
        {"easyRAID", "16P", NULL, BLIST_NOREPORTLUN},
        {"easyRAID", "X6P", NULL, BLIST_NOREPORTLUN},

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 9460391..633b198 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -38,6 +38,7 @@
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_ioctl.h>
 #include <scsi/scsi_dh.h>
+#include <scsi/scsi_devinfo.h>
 #include <scsi/sg.h>
 
 #include "scsi_priv.h"
@@ -525,6 +526,9 @@ int scsi_check_sense(struct scsi_cmnd *scmd)
                if (sshdr.asc == 0x10) /* DIF */
                        return SUCCESS;
 
+               if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF)
+                       return ADD_TO_MLQUEUE;
+
                return NEEDS_RETRY;
        case NOT_READY:
        case UNIT_ATTENTION:

diff --git a/include/scsi/scsi_devinfo.h b/include/scsi/scsi_devinfo.h
index 3434e14..91a327e 100644 (file)
--- a/include/scsi/scsi_devinfo.h
+++ b/include/scsi/scsi_devinfo.h
@@ -63,8 +63,10 @@
 #define BLIST_MAX_1024         ((__force blist_flags_t)(1ULL << 30))
 /* Use UNMAP limit for WRITE SAME */
 #define BLIST_UNMAP_LIMIT_WS   ((__force blist_flags_t)(1ULL << 31))
+/* Always retry ABORTED_COMMAND with Internal Target Failure */
+#define BLIST_RETRY_ITF                ((__force blist_flags_t)(1ULL << 32))
 
-#define __BLIST_LAST_USED BLIST_UNMAP_LIMIT_WS
+#define __BLIST_LAST_USED BLIST_RETRY_ITF
 
 #define __BLIST_HIGH_UNUSED (~(__BLIST_LAST_USED | \
                               (__force blist_flags_t) \