nvmet-tcp: move send/recv error handling in the send/recv methods instead of call-sites

Have routines handle errors and just bail out of the poll loop.
This simplifies the code and will help as we may enhance the poll
loop logic and these are somewhat in the way.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/target/tcp.c

@@ -325,6 +325,14 @@ static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue)
 		kernel_sock_shutdown(queue->sock, SHUT_RDWR);
 }
 
+static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status)
+{
+	if (status == -EPIPE || status == -ECONNRESET)
+		kernel_sock_shutdown(queue->sock, SHUT_RDWR);
+	else
+		nvmet_tcp_fatal_error(queue);
+}
+
 static int nvmet_tcp_map_data(struct nvmet_tcp_cmd *cmd)
 {
 	struct nvme_sgl_desc *sgl = &cmd->req.cmd->common.dptr.sgl;
@@ -718,11 +726,15 @@ static int nvmet_tcp_try_send(struct nvmet_tcp_queue *queue,
 
 	for (i = 0; i < budget; i++) {
 		ret = nvmet_tcp_try_send_one(queue, i == budget - 1);
-		if (ret <= 0)
+		if (unlikely(ret < 0)) {
+			nvmet_tcp_socket_error(queue, ret);
+			goto done;
+		} else if (ret == 0) {
 			break;
+		}
 		(*sends)++;
 	}
-
+done:
 	return ret;
 }
 
@@ -1159,11 +1171,15 @@ static int nvmet_tcp_try_recv(struct nvmet_tcp_queue *queue,
 
 	for (i = 0; i < budget; i++) {
 		ret = nvmet_tcp_try_recv_one(queue);
-		if (ret <= 0)
+		if (unlikely(ret < 0)) {
+			nvmet_tcp_socket_error(queue, ret);
+			goto done;
+		} else if (ret == 0) {
 			break;
+		}
 		(*recvs)++;
 	}
-
+done:
 	return ret;
 }
 
@@ -1188,27 +1204,16 @@ static void nvmet_tcp_io_work(struct work_struct *w)
 		pending = false;
 
 		ret = nvmet_tcp_try_recv(queue, NVMET_TCP_RECV_BUDGET, &ops);
-		if (ret > 0) {
+		if (ret > 0)
 			pending = true;
-		} else if (ret < 0) {
-			if (ret == -EPIPE || ret == -ECONNRESET)
-				kernel_sock_shutdown(queue->sock, SHUT_RDWR);
-			else
-				nvmet_tcp_fatal_error(queue);
+		else if (ret < 0)
 			return;
-		}
 
 		ret = nvmet_tcp_try_send(queue, NVMET_TCP_SEND_BUDGET, &ops);
-		if (ret > 0) {
-			/* transmitted message/data */
+		if (ret > 0)
 			pending = true;
-		} else if (ret < 0) {
-			if (ret == -EPIPE || ret == -ECONNRESET)
-				kernel_sock_shutdown(queue->sock, SHUT_RDWR);
-			else
-				nvmet_tcp_fatal_error(queue);
+		else if (ret < 0)
 			return;
-		}
 
 	} while (pending && ops < NVMET_TCP_IO_WORK_BUDGET);