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, 10 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 84d9298ed989..d5088ce78290 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -549,6 +549,13 @@ static void srp_remove_work(struct work_struct *work)
         srp_remove_target(target);
 }
 
+static void srp_rport_delete(struct srp_rport *rport)
+{
+        struct srp_target_port *target = rport->lld_data;
+
+        srp_queue_remove_work(target);
+}
+
 static int srp_connect_target(struct srp_target_port *target)
 {
         int retries = 3;
@@ -1958,6 +1965,8 @@ static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
                 return PTR_ERR(rport);
         }
 
+        rport->lld_data = target;
+
         spin_lock(&host->target_lock);
         list_add_tail(&target->list, &host->target_list);
         spin_unlock(&host->target_lock);
@@ -2524,6 +2533,7 @@ static void srp_remove_one(struct ib_device *device)
 }
 
 static struct srp_function_template ib_srp_transport_functions = {
+        .rport_delete            = srp_rport_delete,
 };
 
 static int __init srp_init_module(void)