qla2xxx: Honor FCP_RSP retry delay timer field.
Parse the retry delay timer field from the FCP response data and if:
- It is not zero
- The SCSI status is busy or queue full
return SCSI_MLQUEUE_TARGET_BUSY for the number of milliseconds specified
in the retry delay timer field.
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 550ffdf..f15f87e 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1983,6 +1983,7 @@
int logit = 1;
int res = 0;
uint16_t state_flags = 0;
+ uint16_t retry_delay = 0;
sts = (sts_entry_t *) pkt;
sts24 = (struct sts_entry_24xx *) pkt;
@@ -2076,6 +2077,9 @@
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;
} else {
if (scsi_status & SS_SENSE_LEN_VALID)
sense_len = le16_to_cpu(sts->req_sense_length);
@@ -2110,6 +2114,14 @@
comp_status = CS_DATA_OVERRUN;
/*
+ * 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);
+
+ /*
* Based on Host and scsi status generate status code for Linux
*/
switch (comp_status) {