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From: Jacques Fourie <jacques.fourie@gmail.com>
To: dev@dpdk.org
Subject: [dpdk-dev] L4 rx checksum verification in tun/tap pmd
Date: Wed, 16 Dec 2020 10:58:11 -0500
Message-ID: <CALX0vxB0HGd97-P9ZVfLS5A3U3uVyH27ksp9nWKj3zOB8149SQ@mail.gmail.com> (raw)


I noticed that TCP rx checksum verification fails when using the tap pmd.
In this particular case packets with correct checksums will always have
PKT_RX_L4_CKSUM_BAD set in ol_flags. The rte_ipv4_udptcp_cksum() and
rte_ipv6_udptcp_cksum() functions already return the ones complement of the
checksum, unlike rte_raw_cksum(), which is used for the L3 checksum
verification. After changing the code to use rte_ipv4_udptcp_cksum()
instead of ~rte_ipv4_udptcp_cksum() the problem seems to be fixed. The same
thing goes for rte_ipv6_udptcp_cksum().


                 reply	other threads:[~2020-12-16 15:58 UTC|newest]

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