linux-kernel - Re: [PATCH V5 1/2] nvme-pci: introduce RECONNECTING state to mark initializing procedure

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Message-ID: <4be66899-0246-9d03-eb03-76488e7e629e@mellanox.com>
Date:   Thu, 18 Jan 2018 12:17:18 +0200
From:   Max Gurtovoy <maxg@...lanox.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>,
        <keith.busch@...el.com>, <axboe@...com>, <hch@....de>,
        <sagi@...mberg.me>, <james.smart@...adcom.com>
CC:     <linux-nvme@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V5 1/2] nvme-pci: introduce RECONNECTING state to mark
 initializing procedure



On 1/18/2018 12:10 PM, Jianchao Wang wrote:
> 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.

I guess we can call it NVME_CTRL_CONNECTING in later patch (more 
suitable name for this state now).

> 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>
> 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;
>