From: Arun Easi <aeasi@xxxxxxxxxxx>
FCP-4 (referred FCP-4 rev-2b) identifies the earlier known "retry delay
timer" field as "status qualifier", which is described in SAM-5 and
later specs. This fix makes appropriate driver side modifications to
honor the new definition. The SAM document referred was SAM-6 rev-5.
Signed-off-by: Arun Easi <aeasi@xxxxxxxxxxx>
Signed-off-by: Himanshu Madhani <hmadhani@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
---
drivers/scsi/qla2xxx/qla_fw.h | 2 +-
drivers/scsi/qla2xxx/qla_inline.h | 38 +++++++++++++++++++++++++++----
drivers/scsi/qla2xxx/qla_isr.c | 18 ++++-----------
3 files changed, 40 insertions(+), 18 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_fw.h b/drivers/scsi/qla2xxx/qla_fw.h
index bba1b77fba7e..f0052d75849c 100644
--- a/drivers/scsi/qla2xxx/qla_fw.h
+++ b/drivers/scsi/qla2xxx/qla_fw.h
@@ -619,7 +619,7 @@ struct sts_entry_24xx {
#define SF_NVME_ERSP BIT_6
#define SF_FCP_RSP_DMA BIT_0
- __le16 retry_delay;
+ __le16 status_qualifier;
__le16 scsi_status; /* SCSI status. */
#define SS_CONFIRMATION_REQ BIT_12
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h
index 861dc522723c..5501b4c581ec 100644
--- a/drivers/scsi/qla2xxx/qla_inline.h
+++ b/drivers/scsi/qla2xxx/qla_inline.h
@@ -266,11 +266,41 @@ qla2x00_handle_mbx_completion(struct qla_hw_data *ha, int status)
}
static inline void
-qla2x00_set_retry_delay_timestamp(fc_port_t *fcport, uint16_t retry_delay)
+qla2x00_set_retry_delay_timestamp(fc_port_t *fcport, uint16_t sts_qual)
{
- if (retry_delay)
- fcport->retry_delay_timestamp = jiffies +
- (retry_delay * HZ / 10);
+ u8 scope;
+ u16 qual;
+#define SQ_SCOPE_MASK 0xc000 /* SAM-6 rev5 5.3.2 */
+#define SQ_SCOPE_SHIFT 14
+#define SQ_QUAL_MASK 0x3fff
+
+#define SQ_MAX_WAIT_SEC 60 /* Max I/O hold off time in seconds. */
+#define SQ_MAX_WAIT_TIME (SQ_MAX_WAIT_SEC * 10) /* in 100ms. */
+
+ if (!sts_qual) /* Common case. */
+ return;
+
+ scope = (sts_qual & SQ_SCOPE_MASK) >> SQ_SCOPE_SHIFT;
+ /* Handle only scope 1 or 2, which is for I-T nexus. */
+ if (scope != 1 && scope != 2)
+ return;
+
+ /* Skip processing, if retry delay timer is already in effect. */
+ if (fcport->retry_delay_timestamp &&
+ time_before(jiffies, fcport->retry_delay_timestamp))
+ return;
+
+ qual = sts_qual & SQ_QUAL_MASK;
+ if (qual < 1 || qual > 0x3fef)
+ return;
+ qual = min(qual, (u16)SQ_MAX_WAIT_TIME);
+
+ /* qual is expressed in 100ms increments. */
+ fcport->retry_delay_timestamp = jiffies + (qual * HZ / 10);
+
+ ql_log(ql_log_warn, fcport->vha, 0x5101,
+ "%8phC: I/O throttling requested (status qualifier = %04xh), holding off I/Os for %ums.\n",
+ fcport->port_name, sts_qual, qual * 100);
}
static inline bool
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index ab5275dbc338..d38dd6520b53 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -2855,7 +2855,7 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
int logit = 1;
int res = 0;
uint16_t state_flags = 0;
- uint16_t retry_delay = 0;
+ uint16_t sts_qual = 0;
if (IS_FWI2_CAPABLE(ha)) {
comp_status = le16_to_cpu(sts24->comp_status);
@@ -2953,8 +2953,6 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
sense_len = par_sense_len = rsp_info_len = resid_len =
fw_resid_len = 0;
if (IS_FWI2_CAPABLE(ha)) {
- u16 sts24_retry_delay = le16_to_cpu(sts24->retry_delay);
-
if (scsi_status & SS_SENSE_LEN_VALID)
sense_len = le32_to_cpu(sts24->sense_len);
if (scsi_status & SS_RESPONSE_INFO_LEN_VALID)
@@ -2968,13 +2966,7 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
host_to_fcp_swap(sts24->data, sizeof(sts24->data));
ox_id = le16_to_cpu(sts24->ox_id);
par_sense_len = sizeof(sts24->data);
- /* Valid values of the retry delay timer are 0x1-0xffef */
- if (sts24_retry_delay > 0 && sts24_retry_delay < 0xfff1) {
- retry_delay = sts24_retry_delay & 0x3fff;
- ql_dbg(ql_dbg_io, sp->vha, 0x3033,
- "%s: scope=%#x retry_delay=%#x\n", __func__,
- sts24_retry_delay >> 14, retry_delay);
- }
+ sts_qual = le16_to_cpu(sts24->status_qualifier);
} else {
if (scsi_status & SS_SENSE_LEN_VALID)
sense_len = le16_to_cpu(sts->req_sense_length);
@@ -3012,9 +3004,9 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
* Check retry_delay_timer value if we receive a busy or
* queue full.
*/
- if (lscsi_status == SAM_STAT_TASK_SET_FULL ||
- lscsi_status == SAM_STAT_BUSY)
- qla2x00_set_retry_delay_timestamp(fcport, retry_delay);
+ if (unlikely(lscsi_status == SAM_STAT_TASK_SET_FULL ||
+ lscsi_status == SAM_STAT_BUSY))
+ qla2x00_set_retry_delay_timestamp(fcport, sts_qual);
/*
* Based on Host and scsi status generate status code for Linux
--
2.19.0.rc0
