Re: [dpdk-dev] [PATCH v3] net/ixgbe: fix UDP zero checksum error

Hi Haiyue,

Haiyue Wang [off-list ref] writes:

There is an 82599 errata that UDP frames with a zero checksum are
incorrectly marked as checksum invalid by the hardware.  This was
leading to misleading PKT_RX_L4_CKSUM_BAD flag.

This patch changes the bad UDP checksum to PKT_RX_L4_CKSUM_UNKNOWN,
so the software application will then have to recompute the checksum
itself if needed.

Bugzilla ID: 629
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org

Reported-by: Paolo Valerio <redacted>
Signed-off-by: Haiyue Wang <redacted>
---
v3: Update the hardware errata doc name and session
v2: Change the always GOOD checksum to UNKOWN if BAD.
---
 doc/guides/nics/ixgbe.rst              | 10 ++++++++
 drivers/net/ixgbe/ixgbe_rxtx.c         | 30 ++++++++++++++++++++----
 drivers/net/ixgbe/ixgbe_rxtx.h         |  2 ++
 drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 32 +++++++++++++++++++++++---
 4 files changed, 67 insertions(+), 7 deletions(-)

Tested it successfully with OvS ct() action and testpmd.

Thanks,
Paolo