linux-kernel - Re: [PATCH] nvme-tcp: Do not reset transport on data digest errors

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Date:   Fri, 20 Aug 2021 12:20:43 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Sagi Grimberg <sagi@...mberg.me>,
        yi.he@....com
Subject: Re: [PATCH] nvme-tcp: Do not reset transport on data digest errors

On 8/5/21 2:15 PM, Daniel Wagner wrote:
> The spec says
> 
>    7.4.6.1 Digest Error handling
> 
>    When a host detects a data digest error in a C2HData PDU, that host
>    shall continue processing C2HData PDUs associated with the command and
>    when the command processing has completed, if a successful status was
>    returned by the controller, the host shall fail the command with a
>    non-fatal transport error.
> 
> Currently the transport is reseted when a data digest error is
> detected. To fix this, keep track of the final status in the queue
> object and use it when completing the request.
> 
> The new member can be placed adjacent to the receive related members and
> fits in the cacheline as there is a 4 byte hole.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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