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| author | Quinn Tran <qutran@marvell.com> | 2022-12-19 14:07:41 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-01-12 05:28:37 +0300 |
| commit | 41e5afe51f75f2858f5563145348f6c26d307b8f (patch) | |
| tree | 7d7ada02cd9e0ea31e985ec9d1e605bdc3d2311a /drivers/scsi/qla2xxx/qla_def.h | |
| parent | c75e6aef5039830cce5d4cf764dd204522f89e6b (diff) | |
| download | linux-41e5afe51f75f2858f5563145348f6c26d307b8f.tar.xz | |
scsi: qla2xxx: Fix exchange oversubscription
In large environment, it is possible to experience command timeout and
escalation of path recovery. Currently the driver does not track the number
of exchanges/commands sent to FW. If there is a delay for commands at the
head of the queue, then this will create back pressure for commands at the
back of the queue.
Check for exchange availability before command submission.
Fixes: 89c72f4245a8 ("scsi: qla2xxx: Add IOCB resource tracking")
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_def.h')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_def.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h index a26a373be9da..cd4eb11b0707 100644 --- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -660,7 +660,7 @@ enum { struct iocb_resource { u8 res_type; - u8 pad; + u8 exch_cnt; u16 iocb_cnt; }; @@ -3721,6 +3721,10 @@ struct qla_fw_resources { u16 iocbs_limit; u16 iocbs_qp_limit; u16 iocbs_used; + u16 exch_total; + u16 exch_limit; + u16 exch_used; + u16 pad; }; #define QLA_IOCB_PCT_LIMIT 95 |