linux-kernel - [PATCH AUTOSEL 5.4 204/350] nvme: introduce "Command Aborted By host" status code

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Message-Id: <20191210210735.9077-165-sashal@kernel.org>
Date:   Tue, 10 Dec 2019 16:05:09 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Max Gurtovoy <maxg@...lanox.com>, Christoph Hellwig <hch@....de>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 204/350] nvme: introduce "Command Aborted By host" status code

From: Max Gurtovoy <maxg@...lanox.com>

[ Upstream commit 2dc3947b53f573e8a75ea9cbec5588df88ca502e ]

Fix the status code of canceled requests initiated by the host according
to TP4028 (Status Code 0x371):
"Command Aborted By host: The command was aborted as a result of host
action (e.g., the host disconnected the Fabric connection)."

Also in a multipath environment, unless otherwise specified, errors of
this type (path related) should be retried using a different path, if
one is available.

Signed-off-by: Max Gurtovoy <maxg@...lanox.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c      | 2 +-
 drivers/nvme/host/multipath.c | 1 +
 include/linux/nvme.h          | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index fa7ba09dca771..393913e2fb233 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -313,7 +313,7 @@ bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 	if (blk_mq_request_completed(req))
 		return true;
 
-	nvme_req(req)->status = NVME_SC_HOST_PATH_ERROR;
+	nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD;
 	blk_mq_complete_request(req);
 	return true;
 }
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index e0f064dcbd021..132ade51ee877 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -95,6 +95,7 @@ void nvme_failover_req(struct request *req)
 		}
 		break;
 	case NVME_SC_HOST_PATH_ERROR:
+	case NVME_SC_HOST_ABORTED_CMD:
 		/*
 		 * Temporary transport disruption in talking to the controller.
 		 * Try to send on a new path.
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index f61d6906e59d1..a260cd754f28b 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -1368,6 +1368,7 @@ enum {
 	NVME_SC_ANA_INACCESSIBLE	= 0x302,
 	NVME_SC_ANA_TRANSITION		= 0x303,
 	NVME_SC_HOST_PATH_ERROR		= 0x370,
+	NVME_SC_HOST_ABORTED_CMD	= 0x371,
 
 	NVME_SC_CRD			= 0x1800,
 	NVME_SC_DNR			= 0x4000,
-- 
2.20.1