From: Max Gurtovoy <maxg@mellanox.com>
Date: Wed, 27 Jun 2018 11:58:02 +0000 (+0300)
Subject: nvmet-rdma: add unlikely check in the fast path
X-Git-Tag: v4.19-rc1~173^2~72^2~12
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=2fc464e2162c2b2f7faf7404fa9c35d1cf70aa00;p=linux.git

nvmet-rdma: add unlikely check in the fast path

ib_post_send operation should succeed unless something unusual
happened to the ib device.

Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 2106ae2ec177..4ca09456bbbb 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -546,7 +546,7 @@ static void nvmet_rdma_queue_response(struct nvmet_req *req)
 		rsp->send_sge.addr, rsp->send_sge.length,
 		DMA_TO_DEVICE);
 
-	if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) {
+	if (unlikely(ib_post_send(cm_id->qp, first_wr, &bad_wr))) {
 		pr_err("sending cmd response failed\n");
 		nvmet_rdma_release_rsp(rsp);
 	}