netdev - Re: [PATCH net] net: sparx5: fix handling uneven length packets in manual extraction

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Date:   Fri, 26 Aug 2022 11:27:49 +0200
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Casper Andersson <casper.casan@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Lars Povlsen <lars.povlsen@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: sparx5: fix handling uneven length packets in
 manual extraction

Hi Casper,

Good Catch.

On Thu, 2022-08-25 at 10:49 +0200, Casper Andersson wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Packets that are not of length divisible by 4 (e.g. 77, 78, 79) would
> have the checksum included up to next multiple of 4 (a 77 bytes packet
> would have 3 bytes of ethernet checksum included). The check for the
> value expects it in host (Little) endian.
> 
> Fixes: f3cad2611a77 ("net: sparx5: add hostmode with phylink support")
> Signed-off-by: Casper Andersson <casper.casan@...il.com>
> ---
>  drivers/net/ethernet/microchip/sparx5/sparx5_packet.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
> b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
> index 304f84aadc36..21844beba72d 100644
> --- a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
> +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
> @@ -113,6 +113,8 @@ static void sparx5_xtr_grp(struct sparx5 *sparx5, u8 grp, bool byte_swap)
>                         /* This assumes STATUS_WORD_POS == 1, Status
>                          * just after last data
>                          */
> +                       if (!byte_swap)
> +                               val = ntohl((__force __be32)val);
>                         byte_cnt -= (4 - XTR_VALID_BYTES(val));
>                         eof_flag = true;
>                         break;
> --
> 2.34.1
> 
Reviewed-by: Steen Hegelund <Steen.Hegelund@...rochip.com>

-- 
Best Regards
Steen

-=-=-=-=-=-=-=-=-=-=-=-=-=-=
steen.hegelund@...rochip.com