[PATCH for-4.12-rc] nvme-rdma: fast fail incoming requests while we reconnect

[Max Gurtovoy]

hi,

> -static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue,
> +static inline int nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue,
>  		struct request *rq)
>  {
>  	if (unlikely(!test_bit(NVME_RDMA_Q_LIVE, &queue->flags))) {
> @@ -1441,11 +1443,22 @@ static inline bool nvme_rdma_queue_is_ready(struct nvme_rdma_queue *queue,
>
>  		if (!blk_rq_is_passthrough(rq) ||
>  		    cmd->common.opcode != nvme_fabrics_command ||
> -		    cmd->fabrics.fctype != nvme_fabrics_type_connect)
> -			return false;
> +		    cmd->fabrics.fctype != nvme_fabrics_type_connect) {
> +			/*
> +			 * reconnecting state means transport disruption, which
> +			 * can take a long time and even might fail permanently,
> +			 * so we can't let incoming I/O be requeued forever.
> +			 * fail it fast to allow upper layers a chance to
> +			 * failover.
> +			 */
> +			if (queue->ctrl->ctrl->state == NVME_CTRL_RECONNECTING)

Sagi/Christoph,
It should be queue->ctrl->ctrl.state.

we are testing this patch also now.