linux-kernel - [PATCH RESENT] nvme-pci: introduce RECONNECTING state to mark initializing procedure

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Message-Id: <1516629796-2919-1-git-send-email-jianchao.w.wang@oracle.com>
Date:   Mon, 22 Jan 2018 22:03:16 +0800
From:   Jianchao Wang <jianchao.w.wang@...cle.com>
To:     keith.busch@...el.com, axboe@...com, hch@....de, sagi@...mberg.me,
        maxg@...lanox.com, james.smart@...adcom.com
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH RESENT] nvme-pci: introduce RECONNECTING state to mark initializing procedure

After Sagi's commit (nvme-rdma: fix concurrent reset and reconnect),
both nvme-fc/rdma have following pattern:
RESETTING    - quiesce blk-mq queues, teardown and delete queues/
               connections, clear out outstanding IO requests...
RECONNECTING - establish new queues/connections and some other
               initializing things.
Introduce RECONNECTING to nvme-pci transport to do the same mark.
Then we get a coherent state definition among nvme pci/rdma/fc
transports.

Suggested-by: James Smart <james.smart@...adcom.com>
Reviewed-by: James Smart <james.smart@...adcom.com>
Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>
---
 drivers/nvme/host/core.c |  2 +-
 drivers/nvme/host/pci.c  | 19 +++++++++++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 230cc09..23b3e53 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -242,7 +242,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 	switch (new_state) {
 	case NVME_CTRL_ADMIN_ONLY:
 		switch (old_state) {
-		case NVME_CTRL_RESETTING:
+		case NVME_CTRL_RECONNECTING:
 			changed = true;
 			/* FALLTHRU */
 		default:
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 45f843d..05344be 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1138,9 +1138,14 @@ static bool nvme_should_reset(struct nvme_dev *dev, u32 csts)
 	 */
 	bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO);
 
-	/* If there is a reset ongoing, we shouldn't reset again. */
-	if (dev->ctrl.state == NVME_CTRL_RESETTING)
+	/* If there is a reset/reinit ongoing, we shouldn't reset again. */
+	switch (dev->ctrl.state) {
+	case NVME_CTRL_RESETTING:
+	case NVME_CTRL_RECONNECTING:
 		return false;
+	default:
+		break;
+	}
 
 	/* We shouldn't reset unless the controller is on fatal error state
 	 * _or_ if we lost the communication with it.
@@ -2304,6 +2309,16 @@ static void nvme_reset_work(struct work_struct *work)
 	if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
 		nvme_dev_disable(dev, false);
 
+	/*
+	 * Introduce RECONNECTING state from nvme-fc/rdma transports to mark the
+	 * initializing procedure here.
+	 */
+	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RECONNECTING)) {
+		dev_warn(dev->ctrl.device,
+			"failed to mark controller RECONNECTING\n");
+		goto out;
+	}
+
 	result = nvme_pci_enable(dev);
 	if (result)
 		goto out;
-- 
2.7.4