diff options
Diffstat (limited to 'drivers/infiniband/ulp/srp/ib_srp.c')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 922d845f76b..5aa70e96ec9 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_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, |