net: factor out header validation #7557
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This PR centralizes network header validation. The XDP tile guarantees that packets sent downstream will have passed validation.
For ease of review/reversability of desired, the first commit performs the refactor. The second commit changes the reported xdp metrics to take advantage of the new error codes.
The RX perf impact of this change is slightly positive (tested using Pktgen-DPDK from rd-merenguel1 (mlx5) to rd-chachal1 on (mlx5):
before: 8.617 Mpps
After: 8.713 Mpps