[dpdk-dev] [PATCH v4] app/testpmd: fix TX checksum calculation for tunnel

[Olivier Matz]

On Thu, Jul 29, 2021 at 08:01:41PM +0300, Gregory Etelson wrote:
> csumonly engine calculates TX checksum of a tunnelled packet for outer
> headers only or separately for outer and inner headers. The
> calculation method is determined by checksum configuration options.
> If TX checksum calculation is separated, the inner headers are
> processed before outer headers.
> 
> Inner headers processing sets checksum values to 0 unconditionally.
> If TX configuration offloads inner checksums only, outer checksum
> calculation in software will read 0 instead of real values and
> produce wrong result.
> 
> The patch zeroes inner checksums only before software calculation.
> 
> Fixes: 6b520d54ebfe ("app/testpmd: use Tx preparation in checksum engine")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Gregory Etelson <getelson at nvidia.com>

Acked-by: Olivier Matz <olivier.matz at 6wind.com>