IB/srp: Make queue size configurable

Certain storage configurations, e.g. a sufficiently large array of
hard disks in a RAID configuration, need a queue depth above 64 to
achieve optimal performance. Hence make the queue depth configurable.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Tested-by: Jack Wang <xjtuwjp@gmail.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/ABI/stable/sysfs-driver-ib_srp b/Documentation/ABI/stable/sysfs-driver-ib_srp
index b95067eb5f18..b9688de8455b 100644
--- a/Documentation/ABI/stable/sysfs-driver-ib_srp
+++ b/Documentation/ABI/stable/sysfs-driver-ib_srp
@@ -63,6 +63,10 @@ Description:	Interface for making ib_srp connect to a new target.
                   over multiple CPU's.
                 * tl_retry_count, a number in the range 2..7 specifying the
                   IB RC retry count.
+                * queue_size, the maximum number of commands that the
+                  initiator is allowed to queue per SCSI host. The default
+                  value for this parameter is 62. The lowest supported value
+                  is 2.
 
 What:           /sys/class/infiniband_srp/srp-<hca>-<port_number>/ibdev
 Date:           January 2, 2006