linux-kernel - Re: [PATCH 7/8] net: qualcomm: rmnet: mark endianness of struct rmnet_map_dl_csum

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Date:   Mon, 20 May 2019 10:17:55 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Alex Elder <elder@...aro.org>
Cc:     arnd@...db.de, subashab@...eaurora.org, david.brown@...aro.org,
        agross@...nel.org, davem@...emloft.net,
        ilias.apalodimas@...aro.org, cpratapa@...eaurora.org,
        syadagir@...eaurora.org, evgreen@...omium.org, benchan@...gle.com,
        ejcaruso@...gle.com, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/8] net: qualcomm: rmnet: mark endianness of struct
 rmnet_map_dl_csum_trailer fields

On Mon 20 May 06:53 PDT 2019, Alex Elder wrote:

> Two 16-bit fields (csum_start_offset and csum_length) in the
> rmnet_map_dl_csum_trailer structure are currently defined to have
> type u16.  But they are in fact big endian values, so should be
> properly represented as __be16 values.
> 
> No existing code actually references these fields (they're ignored by
> rmnet_map_ipv4_dl_csum_trailer() and rmnet_map_ipv6_dl_csum_trailer()).
> Changing their type therefore causes no harm, so just fix them.
> 
> Signed-off-by: Alex Elder <elder@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> ---
>  drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> index fb1cdb4ec41f..775b98d34e94 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map.h
> @@ -52,8 +52,8 @@ struct rmnet_map_header {
>  struct rmnet_map_dl_csum_trailer {
>  	u8  reserved1;
>  	u8  flags;		/* RMNET_MAP_DL_* */
> -	u16 csum_start_offset;
> -	u16 csum_length;
> +	__be16 csum_start_offset;
> +	__be16 csum_length;
>  	__be16 csum_value;
>  } __aligned(1);
>  
> -- 
> 2.20.1
>