diff options
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_inline.h')
-rw-r--r-- | drivers/scsi/qla2xxx/qla_inline.h | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h index 2aa6f81f87c4..5b04da8a64c7 100644 --- a/drivers/scsi/qla2xxx/qla_inline.h +++ b/drivers/scsi/qla2xxx/qla_inline.h @@ -271,11 +271,41 @@ 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 |