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IB/srp: Increase block layer timeout 

Increase the block layer timeout for disks so that it is above the
InfiniBand transport layer timeout.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Bart Van Assche 2011-09-03 09:34:48 +02:00 committed by Roland Dreier
parent f4a75d2eb7
commit c9b03c1ae5
2 changed files with 47 additions and 0 deletions
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45
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -1419,6 +1419,33 @@ err:
return -ENOMEM;
}
static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
{
uint64_t T_tr_ns, max_compl_time_ms;
uint32_t rq_tmo_jiffies;
/*
* According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
* table 91), both the QP timeout and the retry count have to be set
* for RC QP's during the RTR to RTS transition.
*/
WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
(IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
/*
* Set target->rq_tmo_jiffies to one second more than the largest time
* it can take before an error completion is generated. See also
* C9-140..142 in the IBTA spec for more information about how to
* convert the QP Local ACK Timeout value to nanoseconds.
*/
T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
do_div(max_compl_time_ms, NSEC_PER_MSEC);
rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
return rq_tmo_jiffies;
}
static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
struct srp_login_rsp *lrsp,
struct srp_target_port *target)
@ -1478,6 +1505,8 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
if (ret)
goto error_free;
target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
if (ret)
goto error_free;
@ -1729,6 +1758,21 @@ static int srp_reset_host(struct scsi_cmnd *scmnd)
return ret;
}
static int srp_slave_configure(struct scsi_device *sdev)
{
struct Scsi_Host *shost = sdev->host;
struct srp_target_port *target = host_to_target(shost);
struct request_queue *q = sdev->request_queue;
unsigned long timeout;
if (sdev->type == TYPE_DISK) {
timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
blk_queue_rq_timeout(q, timeout);
}
return 0;
}
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -1861,6 +1905,7 @@ static struct scsi_host_template srp_template = {
.module = THIS_MODULE,
.name = "InfiniBand SRP initiator",
.proc_name = DRV_NAME,
.slave_configure = srp_slave_configure,
.info = srp_target_info,
.queuecommand = srp_queuecommand,
.eh_abort_handler = srp_abort,

2
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -163,6 +163,8 @@ struct srp_target_port {
struct ib_sa_query *path_query;
int path_query_id;
u32 rq_tmo_jiffies;
struct ib_cm_id *cm_id;
int max_ti_iu_len;