[PATCH bpf-next 0/1] selftests: drv-net: XDP RX checksum metadata test

[Vladimir Vdovin <deliran@verdict.gg>]

Hi Lorenzo,

Here is the driver selftest for your XDP RX checksum series, as
discussed. It is written against your b4/bpf-xdp-meta-rxcksum branch
(the bitmask ip_summed + cksum/cksum_level API) and applies on top of
it rebased onto net-next, since the drv-net xdp_metadata.py test it
extends only exists there. Feel free to pick it straight into v4.

It adds an xdp_rx_csum program to xdp_metadata.bpf.o and two cases
gated on the "checksum" xdp-rx-metadata feature (SKIP on devices
without it, e.g. netdevsim):

 - xdp_rx_csum_valid (tcp/udp variants): traffic with a correct
   checksum from the remote endpoint must be reported with a usable
   verdict (CHECKSUM_UNNECESSARY and/or CHECKSUM_COMPLETE);

 - xdp_rx_csum_invalid: UDP with a corrupted L4 checksum (net/lib
   csum -E) must not be reported as CHECKSUM_UNNECESSARY.


One question on the invalid case: I assert only that UNNECESSARY is not
set for a corrupted checksum (COMPLETE may still legitimately be
reported, since it carries the raw sum for wrong packets too). Is that
the documented expectation you and Jakub want the test to encode, or
should it be stricter?

Thanks,
Vladimir

Vladimir Vdovin (1):
  selftests: drv-net: add XDP RX checksum metadata tests

 .../selftests/drivers/net/hw/xdp_metadata.py  | 103 ++++++++++++++++
 .../selftests/net/lib/xdp_metadata.bpf.c      | 112 ++++++++++++++++--
 2 files changed, 202 insertions(+), 13 deletions(-)

-- 
2.47.0