[PATCH 1/2] nvme-tcp: start error recovery when read_sock fails

[Martin Belanger via B4 Relay]

From: Martin Belanger <martin.belanger at dell.com>

nvme_tcp_recv_skb() disables the queue and starts error recovery for
errors it detects itself. An error returned by the transport reaches
nvme_tcp_try_recv() without either action.

nvme_tcp_io_work() returns on a negative result and does not requeue
itself, so the queue stops receiving and remains stalled until a command
times out.

Report the error and start error recovery when the queue is still
enabled, which indicates that the error was not handled by the actor.

Assisted-by: LLM
Signed-off-by: Martin Belanger <martin.belanger at dell.com>
---
 drivers/nvme/host/tcp.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 7190eb10c248..a03476f0f69d 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1431,7 +1431,21 @@ static int nvme_tcp_try_recv(struct nvme_tcp_queue *queue)
 	queue->nr_cqe = 0;
 	consumed = sock->ops->read_sock(sk, &rd_desc, nvme_tcp_recv_skb);
 	release_sock(sk);
-	return consumed == -EAGAIN ? 0 : consumed;
+	if (consumed == -EAGAIN)
+		return 0;
+
+	/* nvme_tcp_recv_skb() does both of these itself, so a queue that is
+	 * still enabled failed inside read_sock() instead
+	 */
+	if (unlikely(consumed < 0 && queue->rd_enabled)) {
+		dev_err(queue->ctrl->ctrl.device,
+			"queue %d: receive failed: %d\n",
+			nvme_tcp_queue_id(queue), consumed);
+		queue->rd_enabled = false;
+		nvme_tcp_error_recovery(&queue->ctrl->ctrl);
+	}
+
+	return consumed;
 }
 
 static void nvme_tcp_io_work(struct work_struct *w)

-- 
2.53.0