cifs: smbd: Do not schedule work to send immediate packet on every receive

Immediate packets should only be sent to peer when there are new
receive credits made available. New credits show up on freeing
receive buffer, not on receiving data.

Fix this by avoid unnenecessary work schedules.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smbdirect.c

@@ -380,27 +380,6 @@ static bool process_negotiation_response(
 	return true;
 }
 
-/*
- * Check and schedule to send an immediate packet
- * This is used to extend credtis to remote peer to keep the transport busy
- */
-static void check_and_send_immediate(struct smbd_connection *info)
-{
-	if (info->transport_status != SMBD_CONNECTED)
-		return;
-
-	info->send_immediate = true;
-
-	/*
-	 * Promptly send a packet if our peer is running low on receive
-	 * credits
-	 */
-	if (atomic_read(&info->receive_credits) <
-		info->receive_credit_target - 1)
-		queue_delayed_work(
-			info->workqueue, &info->send_immediate_work, 0);
-}
-
 static void smbd_post_send_credits(struct work_struct *work)
 {
 	int ret = 0;
@@ -450,8 +429,16 @@ static void smbd_post_send_credits(struct work_struct *work)
 	info->new_credits_offered += ret;
 	spin_unlock(&info->lock_new_credits_offered);
 
-	/* Check if we can post new receive and grant credits to peer */
-	check_and_send_immediate(info);
+	/* Promptly send an immediate packet as defined in [MS-SMBD] 3.1.1.1 */
+	info->send_immediate = true;
+	if (atomic_read(&info->receive_credits) <
+		info->receive_credit_target - 1) {
+		if (info->keep_alive_requested == KEEP_ALIVE_PENDING ||
+		    info->send_immediate) {
+			log_keep_alive(INFO, "send an empty message\n");
+			smbd_post_send_empty(info);
+		}
+	}
 }
 
 /* Called from softirq, when recv is done */
@@ -546,12 +533,6 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
 			info->keep_alive_requested = KEEP_ALIVE_PENDING;
 		}
 
-		/*
-		 * Check if we need to send something to remote peer to
-		 * grant more credits or respond to KEEP_ALIVE packet
-		 */
-		check_and_send_immediate(info);
-
 		return;
 
 	default:
@@ -1311,25 +1292,6 @@ static void destroy_receive_buffers(struct smbd_connection *info)
 		mempool_free(response, info->response_mempool);
 }
 
-/*
- * Check and send an immediate or keep alive packet
- * The condition to send those packets are defined in [MS-SMBD] 3.1.1.1
- * Connection.KeepaliveRequested and Connection.SendImmediate
- * The idea is to extend credits to server as soon as it becomes available
- */
-static void send_immediate_work(struct work_struct *work)
-{
-	struct smbd_connection *info = container_of(
-					work, struct smbd_connection,
-					send_immediate_work.work);
-
-	if (info->keep_alive_requested == KEEP_ALIVE_PENDING ||
-	    info->send_immediate) {
-		log_keep_alive(INFO, "send an empty message\n");
-		smbd_post_send_empty(info);
-	}
-}
-
 /* Implement idle connection timer [MS-SMBD] 3.1.6.2 */
 static void idle_connection_timer(struct work_struct *work)
 {
@@ -1384,8 +1346,6 @@ void smbd_destroy(struct TCP_Server_Info *server)
 
 	log_rdma_event(INFO, "cancelling idle timer\n");
 	cancel_delayed_work_sync(&info->idle_timer_work);
-	log_rdma_event(INFO, "cancelling send immediate work\n");
-	cancel_delayed_work_sync(&info->send_immediate_work);
 
 	log_rdma_event(INFO, "wait for all send posted to IB to finish\n");
 	wait_event(info->wait_send_pending,
@@ -1719,7 +1679,6 @@ static struct smbd_connection *_smbd_get_connection(
 
 	init_waitqueue_head(&info->wait_send_queue);
 	INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer);
-	INIT_DELAYED_WORK(&info->send_immediate_work, send_immediate_work);
 	queue_delayed_work(info->workqueue, &info->idle_timer_work,
 		info->keep_alive_interval*HZ);
 

fs/cifs/smbdirect.h

@@ -153,7 +153,6 @@ struct smbd_connection {
 
 	struct workqueue_struct *workqueue;
 	struct delayed_work idle_timer_work;
-	struct delayed_work send_immediate_work;
 
 	/* Memory pool for preallocating buffers */
 	/* request pool for RDMA send */