netdev - Re: [PATCH v4 net 2/3] sctp: Use software crc32 checksum when xfrm transform will happen.

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Date:	Wed, 16 Oct 2013 09:32:53 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	fan.du@...driver.com,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH v4 net 2/3] sctp: Use software crc32 checksum when xfrm
 transform will happen.

On Tue, Oct 15, 2013 at 10:01:30PM -0400, Vlad Yasevich wrote:
> From: Fan Du <fan.du@...driver.com>
> 
> igb/ixgbe have hardware sctp checksum support, when this feature is enabled
> and also IPsec is armed to protect sctp traffic, ugly things happened as
> xfrm_output checks CHECKSUM_PARTIAL to do checksum operation(sum every thing
> up and pack the 16bits result in the checksum field). The result is fail
> establishment of sctp communication.
> 
> Cc: Neil Horman <nhorman@...driver.com>
> Cc: Steffen Klassert <steffen.klassert@...unet.com>
> Signed-off-by: Fan Du <fan.du@...driver.com>
> Signed-off-by: Vlad Yasevich <vyasevich@...il.com>
> ---
>  net/sctp/output.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> index 0ac3a65..d35b54c 100644
> --- a/net/sctp/output.c
> +++ b/net/sctp/output.c
> @@ -536,7 +536,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
>  	 * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
>  	 */
>  	if (!sctp_checksum_disable) {
> -		if (!(dst->dev->features & NETIF_F_SCTP_CSUM)) {
> +		if (!(dst->dev->features & NETIF_F_SCTP_CSUM) ||
> +		    (dst_xfrm(dst) != NULL)) {
>  			__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
>  
>  			/* 3) Put the resultant value into the checksum field in the
> -- 
> 1.8.3.1
> 
> --
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> 
Acked-by: Neil Horman <nhorman@...driver.com>

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