From: Bart Van Assche <bvanass...@acm.org>
Enlarge the block layer timeout for disks such that it is above
the InfiniBand transport layer timeout.
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
Signed-off-by: David Dillow <dillo...@ornl.gov>
---
drivers/infiniband/ulp/srp/ib_srp.c | 45 +++++++++++++++++++++++++++++++++++
drivers/infiniband/ulp/srp/ib_srp.h | 2 +
2 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
b/drivers/infiniband/ulp/srp/ib_srp.c
index 922d845..6c0cd66 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -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((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,
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h
b/drivers/infiniband/ulp/srp/ib_srp.h
index 020caf0..e3a6304 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -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;
--
1.7.7.6
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