diff options
| author | Quinn Tran <qutran@marvell.com> | 2020-09-04 07:51:26 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-09-23 01:42:49 +0300 |
| commit | 89c72f4245a8510ffdb0d1980944210b8bc6e49f (patch) | |
| tree | b81139c7985687e4aa13cba9d4e81114e61a97ab /drivers/scsi/qla2xxx/qla_def.h | |
| parent | 6152d20fa6703cf364253efc4eab31151558cb01 (diff) | |
| download | linux-89c72f4245a8510ffdb0d1980944210b8bc6e49f.tar.xz | |
scsi: qla2xxx: Add IOCB resource tracking
This patch tracks number of IOCB resources used in the I/O fast path. If
the number of used IOCBs reach a high water limit, driver would return the
I/O as busy and let upper layer retry. This prevents over subscription of
IOCB resources where any future error recovery command is unable to cut
through. Enable IOCB throttling by default.
Link: https://lore.kernel.org/r/20200904045128.23631-12-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Quinn Tran <qutran@marvell.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.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 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h index 234cc33aeb04..817234de3baf 100644 --- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -624,6 +624,12 @@ enum { TYPE_TGT_TMCMD, /* task management */ }; +struct iocb_resource { + u8 res_type; + u8 pad; + u16 iocb_cnt; +}; + typedef struct srb { /* * Do not move cmd_type field, it needs to @@ -631,6 +637,7 @@ typedef struct srb { */ uint8_t cmd_type; uint8_t pad[3]; + struct iocb_resource iores; struct kref cmd_kref; /* need to migrate ref_count over to this */ void *priv; wait_queue_head_t nvme_ls_waitq; @@ -3577,6 +3584,15 @@ struct req_que { uint8_t req_pkt[REQUEST_ENTRY_SIZE]; }; +struct qla_fw_resources { + u16 iocbs_total; + u16 iocbs_limit; + u16 iocbs_qp_limit; + u16 iocbs_used; +}; + +#define QLA_IOCB_PCT_LIMIT 95 + /*Queue pair data structure */ struct qla_qpair { spinlock_t qp_lock; @@ -3629,6 +3645,7 @@ struct qla_qpair { uint64_t retry_term_jiff; struct qla_tgt_counters tgt_counters; uint16_t cpuid; + struct qla_fw_resources fwres ____cacheline_aligned; }; /* Place holder for FW buffer parameters */ |