linux-kernel - [PATCH AUTOSEL for 4.14 018/100] nvme-fc: check if queue is ready in queue

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Date:   Wed, 24 Jan 2018 04:14:31 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>,
        "Sasha Levin" <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 018/100] nvme-fc: check if queue is ready in
 queue_rq

From: Sagi Grimberg <sagi@...mberg.me>

[ Upstream commit 9e0ed16ab9a9aaf670b81c9cd05b5e50defed654 ]

In case the queue is not LIVE (fully functional and connected at the nvmf
level), we cannot allow any commands other than connect to pass through.

Add a new queue state flag NVME_FC_Q_LIVE which is set after nvmf connect
and cleared in queue teardown.

Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: James Smart <james.smart@...adcom.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/nvme/host/fc.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index be49d0f79381..3148d760d825 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -41,6 +41,7 @@
 
 enum nvme_fc_queue_flags {
 	NVME_FC_Q_CONNECTED = (1 << 0),
+	NVME_FC_Q_LIVE = (1 << 1),
 };
 
 #define NVMEFC_QUEUE_DELAY	3		/* ms units */
@@ -1654,6 +1655,7 @@ nvme_fc_free_queue(struct nvme_fc_queue *queue)
 	if (!test_and_clear_bit(NVME_FC_Q_CONNECTED, &queue->flags))
 		return;
 
+	clear_bit(NVME_FC_Q_LIVE, &queue->flags);
 	/*
 	 * Current implementation never disconnects a single queue.
 	 * It always terminates a whole association. So there is never
@@ -1661,7 +1663,6 @@ nvme_fc_free_queue(struct nvme_fc_queue *queue)
 	 */
 
 	queue->connection_id = 0;
-	clear_bit(NVME_FC_Q_CONNECTED, &queue->flags);
 }
 
 static void
@@ -1740,6 +1741,8 @@ nvme_fc_connect_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize)
 		ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
 		if (ret)
 			break;
+
+		set_bit(NVME_FC_Q_LIVE, &ctrl->queues[i].flags);
 	}
 
 	return ret;
@@ -2048,6 +2051,14 @@ busy:
 	return BLK_STS_RESOURCE;
 }
 
+static inline blk_status_t nvme_fc_is_ready(struct nvme_fc_queue *queue,
+		struct request *rq)
+{
+	if (unlikely(!test_bit(NVME_FC_Q_LIVE, &queue->flags)))
+		return nvmf_check_init_req(&queue->ctrl->ctrl, rq);
+	return BLK_STS_OK;
+}
+
 static blk_status_t
 nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
 			const struct blk_mq_queue_data *bd)
@@ -2063,6 +2074,10 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
 	u32 data_len;
 	blk_status_t ret;
 
+	ret = nvme_fc_is_ready(queue, rq);
+	if (unlikely(ret))
+		return ret;
+
 	ret = nvme_setup_cmd(ns, rq, sqe);
 	if (ret)
 		return ret;
@@ -2398,6 +2413,8 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl)
 	if (ret)
 		goto out_disconnect_admin_queue;
 
+	set_bit(NVME_FC_Q_LIVE, &ctrl->queues[0].flags);
+
 	/*
 	 * Check controller capabilities
 	 *
-- 
2.11.0