scsi_transport_srp: Add periodic reconnect support

Add support for periodically reconnecting to an SRP target until
the dev_loss timer expires. After the tenth reconnection attempt,
gradually slow down subsequent reconnect attempts.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/ABI/stable/sysfs-transport-srp b/Documentation/ABI/stable/sysfs-transport-srp
index 8b6acc775b71..ec7af69fea0a 100644
--- a/Documentation/ABI/stable/sysfs-transport-srp
+++ b/Documentation/ABI/stable/sysfs-transport-srp
@@ -30,6 +30,14 @@ Contact:	linux-scsi@vger.kernel.org
 Description:    16-byte local SRP port identifier in hexadecimal format. An
                 example: 4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00.
 
+What:           /sys/class/srp_remote_ports/port-<h>:<n>/reconnect_delay
+Date:           February 1, 2014
+KernelVersion:  3.13
+Contact:        linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
+Description:    Number of seconds the SCSI layer will wait after a reconnect
+                attempt failed before retrying. Setting this attribute to
+                "off" will disable time-based reconnecting.
+
 What:           /sys/class/srp_remote_ports/port-<h>:<n>/roles
 Date:           June 27, 2007
 KernelVersion:  2.6.24