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>
diff --git a/include/scsi/scsi_transport_srp.h b/include/scsi/scsi_transport_srp.h
index ee70016..4ebf691 100644
--- a/include/scsi/scsi_transport_srp.h
+++ b/include/scsi/scsi_transport_srp.h
@@ -31,7 +31,8 @@
/**
* struct srp_rport
* @lld_data: LLD private data.
- * @mutex: Protects against concurrent rport fast_io_fail / dev_loss_tmo.
+ * @mutex: Protects against concurrent rport reconnect / fast_io_fail /
+ * dev_loss_tmo activity.
*/
struct srp_rport {
/* for initiator and target drivers */
@@ -48,6 +49,9 @@
struct mutex mutex;
enum srp_rport_state state;
bool deleted;
+ int reconnect_delay;
+ int failed_reconnects;
+ struct delayed_work reconnect_work;
int fast_io_fail_tmo;
int dev_loss_tmo;
struct delayed_work fast_io_fail_work;
@@ -60,6 +64,7 @@
* dev_loss_tmo sysfs attribute for an rport.
* @reset_timer_if_blocked: Whether or srp_timed_out() should reset the command
* timer if the device on which it has been queued is blocked.
+ * @reconnect_delay: If not NULL, points to the default reconnect_delay value.
* @fast_io_fail_tmo: If not NULL, points to the default fast_io_fail_tmo value.
* @dev_loss_tmo: If not NULL, points to the default dev_loss_tmo value.
* @reconnect: Callback function for reconnecting to the target. See also
@@ -71,6 +76,7 @@
/* for initiator drivers */
bool has_rport_state;
bool reset_timer_if_blocked;
+ int *reconnect_delay;
int *fast_io_fail_tmo;
int *dev_loss_tmo;
int (*reconnect)(struct srp_rport *rport);
@@ -90,7 +96,8 @@
extern struct srp_rport *srp_rport_add(struct Scsi_Host *,
struct srp_rport_identifiers *);
extern void srp_rport_del(struct srp_rport *);
-extern int srp_tmo_valid(int fast_io_fail_tmo, int dev_loss_tmo);
+extern int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo,
+ int dev_loss_tmo);
extern int srp_reconnect_rport(struct srp_rport *rport);
extern void srp_start_tl_fail_timers(struct srp_rport *rport);
extern void srp_remove_host(struct Scsi_Host *);