linux-kernel - Re: [PATCH v3 1/2] nvme-tcp: short-circuit reconnect retries

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Date: Wed, 6 Mar 2024 08:10:06 +0000
From: Chaitanya Kulkarni <chaitanyak@...dia.com>
To: Daniel Wagner <dwagner@...e.de>, James Smart <james.smart@...adcom.com>
CC: Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>, Sagi
 Grimberg <sagi@...mberg.me>, Hannes Reinecke <hare@...e.de>,
	"linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] nvme-tcp: short-circuit reconnect retries

On 3/5/24 00:00, Daniel Wagner wrote:
> From: Hannes Reinecke <hare@...e.de>
>
> Returning an nvme status from nvme_tcp_setup_ctrl() indicates
> that the association was established and we have received a status
> from the controller; consequently we should honour the DNR bit.
> If not any future reconnect attempts will just return the same error, so
> we can short-circuit the reconnect attempts and fail the connection
> directly.
>
> Signed-off-by: Hannes Reinecke <hare@...e.de>
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/host/tcp.c | 23 +++++++++++++++--------
>   1 file changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
> index 3b20c5ed033f..f9ad5904ed62 100644
> --- a/drivers/nvme/host/tcp.c
> +++ b/drivers/nvme/host/tcp.c
> @@ -2149,9 +2149,11 @@ static void nvme_tcp_teardown_io_queues(struct nvme_ctrl *ctrl,
>   	nvme_tcp_destroy_io_queues(ctrl, remove);
>   }
>   
> -static void nvme_tcp_reconnect_or_remove(struct nvme_ctrl *ctrl)
> +static void nvme_tcp_reconnect_or_remove(struct nvme_ctrl *ctrl,
> +		int status)
>   {
>   	enum nvme_ctrl_state state = nvme_ctrl_state(ctrl);
> +	bool recon = status > 0 && (status & NVME_SC_DNR) ? false : true;
>   

hmmm bunch of nvme command calls may have DNR set ...

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>

-ck