From: Chao Leng <lengchao@huawei.com> To: <linux-nvme@lists.infradead.org> Cc: <kbusch@kernel.org>, <axboe@fb.com>, <hch@lst.de>, <sagi@grimberg.me>, <lengchao@huawei.com>, <linux-block@vger.kernel.org>, <axboe@kernel.dk> Subject: [PATCH 4/6] nvme-rdma: avoid IO error and repeated request completion Date: Tue, 5 Jan 2021 15:19:34 +0800 [thread overview] Message-ID: <20210105071936.25097-5-lengchao@huawei.com> (raw) In-Reply-To: <20210105071936.25097-1-lengchao@huawei.com> When a request is queued failed, blk_status_t is directly returned to the blk-mq. If blk_status_t is not BLK_STS_RESOURCE, BLK_STS_DEV_RESOURCE, BLK_STS_ZONE_RESOURCE, blk-mq call blk_mq_end_request to complete the request with BLK_STS_IOERR. In two scenarios, the request should be retried and may succeed. First, if work with nvme multipath, the request may be retried successfully in another path, because the error is probably related to the path. Second, if work without multipath software, the request may be retried successfully after error recovery. If the request is complete with BLK_STS_IOERR in blk_mq_dispatch_rq_list. The state of request may be changed to MQ_RQ_IN_FLIGHT. If free the request asynchronously such as in nvme_submit_user_cmd, in extreme scenario the request will be repeated freed in tear down. If a non-resource error occurs in queue_rq, should directly call nvme_complete_rq to complete request and set the state of request to MQ_RQ_COMPLETE. nvme_complete_rq will decide to retry, fail over or end the request. Signed-off-by: Chao Leng <lengchao@huawei.com> --- drivers/nvme/host/rdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index df9f6f4549f1..4a89bf44ecdc 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -2093,7 +2093,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, unmap_qe: ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command), DMA_TO_DEVICE); - return ret; + return nvme_try_complete_failed_req(rq, ret); } static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx) -- 2.16.4
WARNING: multiple messages have this Message-ID (diff)
From: Chao Leng <lengchao@huawei.com> To: <linux-nvme@lists.infradead.org> Cc: axboe@kernel.dk, linux-block@vger.kernel.org, sagi@grimberg.me, axboe@fb.com, lengchao@huawei.com, kbusch@kernel.org, hch@lst.de Subject: [PATCH 4/6] nvme-rdma: avoid IO error and repeated request completion Date: Tue, 5 Jan 2021 15:19:34 +0800 [thread overview] Message-ID: <20210105071936.25097-5-lengchao@huawei.com> (raw) In-Reply-To: <20210105071936.25097-1-lengchao@huawei.com> When a request is queued failed, blk_status_t is directly returned to the blk-mq. If blk_status_t is not BLK_STS_RESOURCE, BLK_STS_DEV_RESOURCE, BLK_STS_ZONE_RESOURCE, blk-mq call blk_mq_end_request to complete the request with BLK_STS_IOERR. In two scenarios, the request should be retried and may succeed. First, if work with nvme multipath, the request may be retried successfully in another path, because the error is probably related to the path. Second, if work without multipath software, the request may be retried successfully after error recovery. If the request is complete with BLK_STS_IOERR in blk_mq_dispatch_rq_list. The state of request may be changed to MQ_RQ_IN_FLIGHT. If free the request asynchronously such as in nvme_submit_user_cmd, in extreme scenario the request will be repeated freed in tear down. If a non-resource error occurs in queue_rq, should directly call nvme_complete_rq to complete request and set the state of request to MQ_RQ_COMPLETE. nvme_complete_rq will decide to retry, fail over or end the request. Signed-off-by: Chao Leng <lengchao@huawei.com> --- drivers/nvme/host/rdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index df9f6f4549f1..4a89bf44ecdc 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -2093,7 +2093,7 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, unmap_qe: ib_dma_unmap_single(dev, req->sqe.dma, sizeof(struct nvme_command), DMA_TO_DEVICE); - return ret; + return nvme_try_complete_failed_req(rq, ret); } static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx) -- 2.16.4 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2021-01-05 7:20 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-05 7:19 [PATCH 0/6] avoid repeated request completion and IO error Chao Leng 2021-01-05 7:19 ` Chao Leng 2021-01-05 7:19 ` [PATCH 1/6] blk-mq: introduce blk_mq_set_request_complete Chao Leng 2021-01-05 7:19 ` Chao Leng 2021-01-05 19:16 ` Minwoo Im 2021-01-05 19:16 ` Minwoo Im 2021-01-06 2:29 ` Chao Leng 2021-01-06 2:29 ` Chao Leng 2021-01-05 7:19 ` [PATCH 2/6] nvme-core: introduce complete failed request Chao Leng 2021-01-05 7:19 ` Chao Leng 2021-01-05 19:11 ` Minwoo Im 2021-01-05 19:11 ` Minwoo Im 2021-01-06 2:31 ` Chao Leng 2021-01-06 2:31 ` Chao Leng 2021-01-05 7:19 ` [PATCH 3/6] nvme-fabrics: avoid repeated request completion for nvmf_fail_nonready_command Chao Leng 2021-01-05 7:19 ` Chao Leng 2021-01-05 7:19 ` Chao Leng [this message] 2021-01-05 7:19 ` [PATCH 4/6] nvme-rdma: avoid IO error and repeated request completion Chao Leng 2021-01-05 7:19 ` [PATCH 5/6] nvme-tcp: " Chao Leng 2021-01-05 7:19 ` Chao Leng 2021-01-05 7:19 ` [PATCH 6/6] nvme-fc: " Chao Leng 2021-01-05 7:19 ` Chao Leng
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