[dpdk-stable] [PATCH v2] vhost: fix IPv4 csum calculation

[Ferruh Yigit]

On 10/24/2019 5:29 PM, Flavio Leitner wrote:
> Currently the IPv4 header checksum is calculated including its
> current value, which can be a valid checksum or just garbage.
> In any case, if the original value is not zero, then the result
> is always wrong.
> 
> The IPv4 checksum is defined in RFC791, page 14 says:
>   Header Checksum:  16 bits
> 
>   The checksum algorithm is:
>   The checksum field is the 16 bit one's complement of the one's
>   complement sum of all 16 bit words in the header.  For purposes of
>   computing the checksum, the value of the checksum field is zero.
> 
> Thus force the csum field to always be zero.
> 
> Fixes: b08b8cfeb2ae ("vhost: fix IP checksum")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Flavio Leitner <fbl at sysclose.org>

Applied to dpdk-next-net/master, thanks.