IB/srp: Allow SRP disconnect through sysfs

Make it possible to disconnect the IB RC connection used by the SRP
protocol to communicate with a target.

Have the SRP transport layer create a sysfs "delete" attribute for
initiator drivers that support this functionality.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/scsi/scsi_transport_srp.h b/include/scsi/scsi_transport_srp.h
index 9c60ca1c08c5..ff0f04ac91aa 100644
--- a/include/scsi/scsi_transport_srp.h
+++ b/include/scsi/scsi_transport_srp.h
@@ -14,13 +14,21 @@ struct srp_rport_identifiers {
 };
 
 struct srp_rport {
+        /* for initiator and target drivers */
+
         struct device dev;
 
         u8 port_id[16];
         u8 roles;
+
+        /* for initiator drivers */
+
+        void *lld_data; /* LLD private data */
 };
 
 struct srp_function_template {
+        /* for initiator drivers */
+        void (*rport_delete)(struct srp_rport *rport);
         /* for target drivers */
         int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);
         int (* it_nexus_response)(struct Scsi_Host *, u64, int);