[dpdk-dev] [PATCH 2/4] net/tap: fix Rx cksum flags on TCP packets

[Andrew Rybchenko]

On 4/27/21 4:57 PM, Olivier Matz wrote:
> Since commit d5df2ae0428a ("net: fix unneeded replacement of TCP
> checksum 0"), the functions rte_ipv4_udptcp_cksum() or
> rte_ipv6_udptcp_cksum() can return either 0x0000 or 0xffff when used to
> verify a packet containing a valid checksum.
> 
> This new behavior broke the checksum verification in tap driver for TCP
> packets: these packets are marked with PKT_RX_L4_CKSUM_BAD.
> 
> Fix this by checking the 2 possible values. A next commit will introduce
> a checksum verification helper to simplify this a bit.
> 
> Fixes: d5df2ae0428a ("net: fix unneeded replacement of TCP checksum 0")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>

Acked-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>