iscsi-target: Convert transport drivers to signal rdma_shutdown

Instead of special casing the handful of callers that check for
iser-target rdma verbs specific shutdown, use a simple flag at
iscsit_transport->rdma_shutdown so each driver can signal this.

Also, update iscsi-target/tcp + cxgbit to rdma_shutdown = false.

Cc: Varun Prakash <varun@chelsio.com>
Cc: Hariprasad Shenai <hariprasad@chelsio.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -3285,6 +3285,7 @@ static void isert_get_rx_pdu(struct iscsi_conn *conn)
 static struct iscsit_transport iser_target_transport = {
 	.name			= "IB/iSER",
 	.transport_type		= ISCSI_INFINIBAND,
+	.rdma_shutdown		= true,
 	.priv_size		= sizeof(struct isert_cmd),
 	.owner			= THIS_MODULE,
 	.iscsit_setup_np	= isert_setup_np,

drivers/target/iscsi/cxgbit/cxgbit_main.c

@@ -625,6 +625,7 @@ static enum target_prot_op cxgbit_get_sup_prot_ops(struct iscsi_conn *conn)
 static struct iscsit_transport cxgbit_transport = {
 	.name			= DRV_NAME,
 	.transport_type		= ISCSI_HW_OFFLOAD,
+	.rdma_shutdown		= false,
 	.priv_size		= sizeof(struct cxgbit_cmd),
 	.owner			= THIS_MODULE,
 	.iscsit_setup_np	= cxgbit_setup_np,

drivers/target/iscsi/iscsi_target.c

@@ -670,6 +670,7 @@ static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 static struct iscsit_transport iscsi_target_transport = {
 	.name			= "iSCSI/TCP",
 	.transport_type		= ISCSI_TCP,
+	.rdma_shutdown		= false,
 	.owner			= NULL,
 	.iscsit_setup_np	= iscsit_setup_np,
 	.iscsit_accept_np	= iscsit_accept_np,
@@ -4087,8 +4088,7 @@ int iscsit_close_connection(
 	 * this for iser since isert_rx_opcode() does not wait on logout failure,
 	 * and to avoid iscsi_conn pointer dereference in iser-target code.
 	 */
-	if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
-	    (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
+	if (!conn->conn_transport->rdma_shutdown)
 		complete(&conn->conn_logout_comp);
 
 	if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
@@ -4399,8 +4399,7 @@ static void iscsit_logout_post_handler_closesession(
 	 * always sleep waiting for RX/TX thread shutdown to complete
 	 * within iscsit_close_connection().
 	 */
-	if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
-	    (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
+	if (!conn->conn_transport->rdma_shutdown)
 		sleep = cmpxchg(&conn->tx_thread_active, true, false);
 
 	atomic_set(&conn->conn_logout_remove, 0);
@@ -4417,8 +4416,7 @@ static void iscsit_logout_post_handler_samecid(
 {
 	int sleep = 1;
 
-	if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
-	    (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
+	if (!conn->conn_transport->rdma_shutdown)
 		sleep = cmpxchg(&conn->tx_thread_active, true, false);
 
 	atomic_set(&conn->conn_logout_remove, 0);

include/target/iscsi/iscsi_transport.h

@@ -6,6 +6,7 @@ struct iscsit_transport {
 #define ISCSIT_TRANSPORT_NAME	16
 	char name[ISCSIT_TRANSPORT_NAME];
 	int transport_type;
+	bool rdma_shutdown;
 	int priv_size;
 	struct module *owner;
 	struct list_head t_node;