nvme-rdma: fix timeout handler

Currently, we have several problems with the timeout
handler:
1. If we timeout on the controller establishment flow, we will hang
because we don't execute the error recovery (and we shouldn't because
the create_ctrl flow needs to fail and cleanup on its own)
2. We might also hang if we get a disconnet on a queue while the
controller is already deleting. This racy flow can cause the controller
disable/shutdown admin command to hang.

We cannot complete a timed out request from the timeout handler without
mutual exclusion from the teardown flow (e.g. nvme_rdma_error_recovery_work).
So we serialize it in the timeout handler and teardown io and admin
queues to guarantee that no one races with us from completing the
request.

Reported-by: Jaesoo Lee <jalee@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 0a2fd29..4101961 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1689,18 +1689,28 @@ static enum blk_eh_timer_return
 nvme_rdma_timeout(struct request *rq, bool reserved)
 {
        struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+       struct nvme_rdma_queue *queue = req->queue;
+       struct nvme_rdma_ctrl *ctrl = queue->ctrl;
 
-       dev_warn(req->queue->ctrl->ctrl.device,
-                "I/O %d QID %d timeout, reset controller\n",
-                rq->tag, nvme_rdma_queue_idx(req->queue));
+       dev_warn(ctrl->ctrl.device, "I/O %d QID %d timeout\n",
+                rq->tag, nvme_rdma_queue_idx(queue));
 
-       /* queue error recovery */
-       nvme_rdma_error_recovery(req->queue->ctrl);
+       if (ctrl->ctrl.state != NVME_CTRL_LIVE) {
+               /*
+                * Teardown immediately if controller times out while starting
+                * or we are already started error recovery. all outstanding
+                * requests are completed on shutdown, so we return BLK_EH_DONE.
+                */
+               flush_work(&ctrl->err_work);
+               nvme_rdma_teardown_io_queues(ctrl, false);
+               nvme_rdma_teardown_admin_queue(ctrl, false);
+               return BLK_EH_DONE;
+       }
 
-       /* fail with DNR on cmd timeout */
-       nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
+       dev_warn(ctrl->ctrl.device, "starting error recovery\n");
+       nvme_rdma_error_recovery(ctrl);
 
-       return BLK_EH_DONE;
+       return BLK_EH_RESET_TIMER;
 }
 
 static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,