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qla2xxx: Honor FCP_RSP retry delay timer field.

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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>
This commit is contained in:
Chad Dupuis 2014-09-25 05:16:59 -04:00 committed by Christoph Hellwig
parent 9a6e6400a9
commit e05fe29248
5 changed files with 32 additions and 1 deletions
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2
drivers/scsi/qla2xxx/qla_def.h
View File

@ -2023,6 +2023,8 @@ typedef struct fc_port {
unsigned long last_ramp_up;
uint16_t port_id;
unsigned long retry_delay_timestamp;
} fc_port_t;
#include "qla_mr.h"

2
drivers/scsi/qla2xxx/qla_fw.h
View File

@ -567,7 +567,7 @@ struct sts_entry_24xx {
#define SF_TRANSFERRED_DATA BIT_11
#define SF_FCP_RSP_DMA BIT_0
uint16_t reserved_2;
uint16_t retry_delay;
uint16_t scsi_status; /* SCSI status. */
#define SS_CONFIRMATION_REQ BIT_12

8
drivers/scsi/qla2xxx/qla_inline.h
View File

@ -279,3 +279,11 @@ qla2x00_handle_mbx_completion(struct qla_hw_data *ha, int status)
complete(&ha->mbx_intr_comp);
}
}
static inline void
qla2x00_set_retry_delay_timestamp(fc_port_t *fcport, uint16_t retry_delay)
{
if (retry_delay)
fcport->retry_delay_timestamp = jiffies +
(retry_delay * HZ / 10);
}

12
drivers/scsi/qla2xxx/qla_isr.c
View File

@ -1983,6 +1983,7 @@ 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;
sts = (sts_entry_t *) pkt;
sts24 = (struct sts_entry_24xx *) pkt;
@ -2076,6 +2077,9 @@ 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;
} else {
if (scsi_status & SS_SENSE_LEN_VALID)
sense_len = le16_to_cpu(sts->req_sense_length);
@ -2109,6 +2113,14 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
scsi_status & SS_RESIDUAL_OVER)
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
*/

9
drivers/scsi/qla2xxx/qla_os.c
View File

@ -731,6 +731,15 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
goto qc24_target_busy;
}
/*
* Return target busy if we've received a non-zero retry_delay_timer
* in a FCP_RSP.
*/
if (time_after(jiffies, fcport->retry_delay_timestamp))
fcport->retry_delay_timestamp = 0;
else
goto qc24_target_busy;
sp = qla2x00_get_sp(vha, fcport, GFP_ATOMIC);
if (!sp)
goto qc24_host_busy;