[RFC PATCH] nvme: request remote is usually not involved for nvme devices

Liu Song
2022-09-17T16:41:41Z

From: Liu Song <liusong@linux.alibaba.com>

NVMe devices usually have a 1:1 mapping between "ctx" and "hctx",
so when "nr_ctx" is equal to 1, there is no possibility of remote
request, so the corresponding process can be simplified.

Signed-off-by: Liu Song <liusong@linux.alibaba.com>
---
drivers/nvme/host/nvme.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 216acbe..cc21896 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -672,6 +672,10 @@ static inline bool nvme_try_complete_req(struct request *req, __le16 status,
nvme_should_fail(req);
if (unlikely(blk_should_fake_timeout(req->q)))
return true;
+ if (likely(req->mq_hctx->nr_ctx == 1)) {
+ WRITE_ONCE(req->state, MQ_RQ_COMPLETE);
+ return false;
+ }
return blk_mq_complete_request_remote(req);
}

--
1.8.3.1