Commit 9f98772b authored Jul 27, 2020 by Sagi Grimberg Committed by Christoph Hellwig Jul 29, 2020

nvme-rdma: fix controller reset hang during traffic



commit fe35ec58 ("block: update hctx map when use multiple maps")
exposed an issue where we may hang trying to wait for queue freeze
during I/O. We call blk_mq_update_nr_hw_queues which in case of multiple
queue maps (which we have now for default/read/poll) is attempting to
freeze the queue. However we never started queue freeze when starting the
reset, which means that we have inflight pending requests that entered the
queue that we will not complete once the queue is quiesced.

So start a freeze before we quiesce the queue, and unfreeze the queue
after we successfully connected the I/O queues (and make sure to call
blk_mq_update_nr_hw_queues only after we are sure that the queue was
already frozen).

This follows to how the pci driver handles resets.

Fixes: fe35ec58 ("block: update hctx map when use multiple maps")
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

parent 2875b0ae

drivers/nvme/host/rdma.c

+9 −3

Original line number	Diff line number	Diff line
		@@ -967,15 +967,20 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
		ret = PTR_ERR(ctrl->ctrl.connect_q);
		goto out_free_tag_set;
		}
		} else {
		blk_mq_update_nr_hw_queues(&ctrl->tag_set,
		ctrl->ctrl.queue_count - 1);
		}

		ret = nvme_rdma_start_io_queues(ctrl);
		if (ret)
		goto out_cleanup_connect_q;

		if (!new) {
		nvme_start_queues(&ctrl->ctrl);
		nvme_wait_freeze(&ctrl->ctrl);
		blk_mq_update_nr_hw_queues(ctrl->ctrl.tagset,
		ctrl->ctrl.queue_count - 1);
		nvme_unfreeze(&ctrl->ctrl);
		}

		return 0;

		out_cleanup_connect_q:
		@@ -1008,6 +1013,7 @@ static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
		bool remove)
		{
		if (ctrl->ctrl.queue_count > 1) {
		nvme_start_freeze(&ctrl->ctrl);
		nvme_stop_queues(&ctrl->ctrl);
		nvme_rdma_stop_io_queues(ctrl);
		if (ctrl->ctrl.tagset) {

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