linux-kernel - [PATCH AUTOSEL 5.4 205/330] nvme-multipath: do not reset on unknown status

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Message-Id: <20200918020110.2063155-205-sashal@kernel.org>
Date:   Thu, 17 Sep 2020 21:59:05 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     John Meneghini <johnm@...app.com>, Christoph Hellwig <hch@....de>,
        Hannes Reinecke <hare@...e.de>,
        Keith Busch <kbusch@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 205/330] nvme-multipath: do not reset on unknown status

From: John Meneghini <johnm@...app.com>

[ Upstream commit 764e9332098c0e60251386a507fe46ac91276120 ]

The nvme multipath error handling defaults to controller reset if the
error is unknown. There are, however, no existing nvme status codes that
indicate a reset should be used, and resetting causes unnecessary
disruption to the rest of IO.

Change nvme's error handling to first check if failover should happen.
If not, let the normal error handling take over rather than reset the
controller.

Based-on-a-patch-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: John Meneghini <johnm@...app.com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c      |  5 +----
 drivers/nvme/host/multipath.c | 21 +++++++++------------
 drivers/nvme/host/nvme.h      |  5 +++--
 3 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3cb017fa3a790..05688fa579e81 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -288,11 +288,8 @@ void nvme_complete_rq(struct request *req)
 		nvme_req(req)->ctrl->comp_seen = true;
 
 	if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
-		if ((req->cmd_flags & REQ_NVME_MPATH) &&
-		    blk_path_error(status)) {
-			nvme_failover_req(req);
+		if ((req->cmd_flags & REQ_NVME_MPATH) && nvme_failover_req(req))
 			return;
-		}
 
 		if (!blk_queue_dying(req->q)) {
 			nvme_retry_req(req);
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 0a458f7880887..3968f89f7855a 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -65,17 +65,12 @@ void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 	}
 }
 
-void nvme_failover_req(struct request *req)
+bool nvme_failover_req(struct request *req)
 {
 	struct nvme_ns *ns = req->q->queuedata;
 	u16 status = nvme_req(req)->status;
 	unsigned long flags;
 
-	spin_lock_irqsave(&ns->head->requeue_lock, flags);
-	blk_steal_bios(&ns->head->requeue_list, req);
-	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
-	blk_mq_end_request(req, 0);
-
 	switch (status & 0x7ff) {
 	case NVME_SC_ANA_TRANSITION:
 	case NVME_SC_ANA_INACCESSIBLE:
@@ -104,15 +99,17 @@ void nvme_failover_req(struct request *req)
 		nvme_mpath_clear_current_path(ns);
 		break;
 	default:
-		/*
-		 * Reset the controller for any non-ANA error as we don't know
-		 * what caused the error.
-		 */
-		nvme_reset_ctrl(ns->ctrl);
-		break;
+		/* This was a non-ANA error so follow the normal error path. */
+		return false;
 	}
 
+	spin_lock_irqsave(&ns->head->requeue_lock, flags);
+	blk_steal_bios(&ns->head->requeue_list, req);
+	spin_unlock_irqrestore(&ns->head->requeue_lock, flags);
+	blk_mq_end_request(req, 0);
+
 	kblockd_schedule_work(&ns->head->requeue_work);
+	return true;
 }
 
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 056953bd8bd81..80bfffa943ccd 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -530,7 +530,7 @@ void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
 void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
 void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 			struct nvme_ctrl *ctrl, int *flags);
-void nvme_failover_req(struct request *req);
+bool nvme_failover_req(struct request *req);
 void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
 int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head);
 void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id);
@@ -579,8 +579,9 @@ static inline void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
 	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
 }
 
-static inline void nvme_failover_req(struct request *req)
+static inline bool nvme_failover_req(struct request *req)
 {
+	return false;
 }
 static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl)
 {
-- 
2.25.1