linux-kernel - Re: [PATCH] nvme: Use non zero KATO for persistent discovery connections

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Message-ID: <8bf6c91a-18c5-4236-8176-d03aab8286f4@suse.de>
Date: Tue, 2 Sep 2025 10:56:51 +0200
From: Hannes Reinecke <hare@...e.de>
To: alistair23@...il.com, kbusch@...nel.org, axboe@...nel.dk, hch@....de,
 sagi@...mberg.me, linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH] nvme: Use non zero KATO for persistent discovery
 connections

On 9/2/25 05:52, alistair23@...il.com wrote:
> From: Alistair Francis <alistair.francis@....com>
> 
> The NVMe Base Specification 2.1 states that:
> 
> """
> A host requests an explicit persistent connection ... by specifying a
> non-zero Keep Alive Timer value in the Connect command.
> """
> 
> As such if we are starting a persistent connection to a discovery
> controller and the KATO is currently 0 we need to update KATO to a non
> zero value to avoid continuous timeouts on the target.
> 
> Signed-off-by: Alistair Francis <alistair.francis@....com>
> ---
>   drivers/nvme/host/core.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich