linux-kernel - Re: [PATCH net-next 1/6] net: qualcomm: rmnet: mark trailer field endianness

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Message-ID: <YEGtpapsfaAaGu95@builder.lan>
Date:   Thu, 4 Mar 2021 22:03:49 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Alex Elder <elder@...aro.org>
Cc:     subashab@...eaurora.org, stranche@...eaurora.org,
        davem@...emloft.net, kuba@...nel.org, sharathv@...eaurora.org,
        evgreen@...omium.org, cpratapa@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/6] net: qualcomm: rmnet: mark trailer field
 endianness

On Thu 04 Mar 16:34 CST 2021, Alex Elder wrote:

> The fields in the checksum trailer structure used for QMAP protocol
> RX packets are all big-endian format, so define them that way.
> 
> It turns out these fields are never actually used by the RMNet code.
> The start offset is always assumed to be zero, and the length is
> taken from the other packet headers.  So making these fields
> explicitly big endian has no effect on the behavior of the code.
> 
> Signed-off-by: Alex Elder <elder@...aro.org>

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

Regards,
Bjorn

> ---
>  include/linux/if_rmnet.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/if_rmnet.h b/include/linux/if_rmnet.h
> index 9661416a9bb47..8c7845baf3837 100644
> --- a/include/linux/if_rmnet.h
> +++ b/include/linux/if_rmnet.h
> @@ -32,8 +32,8 @@ struct rmnet_map_dl_csum_trailer {
>  #else
>  #error	"Please fix <asm/byteorder.h>"
>  #endif
> -	u16 csum_start_offset;
> -	u16 csum_length;
> +	__be16 csum_start_offset;
> +	__be16 csum_length;
>  	__be16 csum_value;
>  } __aligned(1);
>  
> -- 
> 2.20.1
>