net/mlx5: HWS, fix modify header pool match for copy actions

mlx5_fs_hws_mh_pool_match() compares a single dword of each action
since rules pass their values as arguments. Copy and add_field actions
keep their destination in the second dword and HWS reads them from the
pattern alone. Two modify headers whose copies differ only in
destination then share a pool and the second rule writes to the wrong
field.

Use the HWS core comparison that checks these actions in full.

Found while checking a Sashiko AI review report and confirmed against
the HWS pattern code. Not reproduced. No in-kernel user puts such
actions on the FDB but RDMA flow actions can. Tested for regressions on
ConnectX-7 with firmware 28.48.1000 on a little-endian host.

Fixes: b36315ca69cb ("net/mlx5: fs, add HWS modify header API function")
Signed-off-by: Alexandre Cassen <acassen@corp.free.fr>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Link: https://patch.msgid.link/20261019133159.1742411-3-acassen@corp.free.fr
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

0 files changed, 0 insertions, 0 deletions