6.14-stable review patch. If anyone has any objections, please let me know.
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From: Michael Liang mliang@purestorage.com
[ Upstream commit 77e40bbce93059658aee02786a32c5c98a240a8a ]
This patch addresses a data corruption issue observed in nvme-tcp during testing.
In an NVMe native multipath setup, when an I/O timeout occurs, all inflight I/Os are canceled almost immediately after the kernel socket is shut down. These canceled I/Os are reported as host path errors, triggering a failover that succeeds on a different path.
However, at this point, the original I/O may still be outstanding in the host's network transmission path (e.g., the NIC’s TX queue). From the user-space app's perspective, the buffer associated with the I/O is considered completed since they're acked on the different path and may be reused for new I/O requests.
Because nvme-tcp enables zero-copy by default in the transmission path, this can lead to corrupted data being sent to the original target, ultimately causing data corruption.
We can reproduce this data corruption by injecting delay on one path and triggering i/o timeout.
To prevent this issue, this change ensures that all inflight transmissions are fully completed from host's perspective before returning from queue stop. To handle concurrent I/O timeout from multiple namespaces under the same controller, always wait in queue stop regardless of queue's state.
This aligns with the behavior of queue stopping in other NVMe fabric transports.
Fixes: 3f2304f8c6d6 ("nvme-tcp: add NVMe over TCP host driver") Signed-off-by: Michael Liang mliang@purestorage.com Reviewed-by: Mohamed Khalfella mkhalfella@purestorage.com Reviewed-by: Randy Jennings randyj@purestorage.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/tcp.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 327f3f2f5399c..d991baa82a1c2 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1944,7 +1944,7 @@ static void __nvme_tcp_stop_queue(struct nvme_tcp_queue *queue) cancel_work_sync(&queue->io_work); }
-static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid) +static void nvme_tcp_stop_queue_nowait(struct nvme_ctrl *nctrl, int qid) { struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl); struct nvme_tcp_queue *queue = &ctrl->queues[qid]; @@ -1963,6 +1963,31 @@ static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid) mutex_unlock(&queue->queue_lock); }
+static void nvme_tcp_wait_queue(struct nvme_ctrl *nctrl, int qid) +{ + struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl); + struct nvme_tcp_queue *queue = &ctrl->queues[qid]; + int timeout = 100; + + while (timeout > 0) { + if (!test_bit(NVME_TCP_Q_ALLOCATED, &queue->flags) || + !sk_wmem_alloc_get(queue->sock->sk)) + return; + msleep(2); + timeout -= 2; + } + dev_warn(nctrl->device, + "qid %d: timeout draining sock wmem allocation expired\n", + qid); +} + +static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid) +{ + nvme_tcp_stop_queue_nowait(nctrl, qid); + nvme_tcp_wait_queue(nctrl, qid); +} + + static void nvme_tcp_setup_sock_ops(struct nvme_tcp_queue *queue) { write_lock_bh(&queue->sock->sk->sk_callback_lock); @@ -2030,7 +2055,9 @@ static void nvme_tcp_stop_io_queues(struct nvme_ctrl *ctrl) int i;
for (i = 1; i < ctrl->queue_count; i++) - nvme_tcp_stop_queue(ctrl, i); + nvme_tcp_stop_queue_nowait(ctrl, i); + for (i = 1; i < ctrl->queue_count; i++) + nvme_tcp_wait_queue(ctrl, i); }
static int nvme_tcp_start_io_queues(struct nvme_ctrl *ctrl,