This patch set improves the documentation and selftests for XDP Rx metadata
handling. The first patch clarifies the documentation around XDP metadata
layout and METADATA_SIZE. The second patch enhances the BPF selftests to
make XDP metadata handling more robust across different NICs.
Prior to this patch set, the XDP program might accidentally overwrite the
device-reserved metadata.
V3:
- update doc and commit msg accordingly.
V2: https://lore.kernel.org/netdev/20250702030349.3275368-1-yoong.siang.song@intel.com/
- unconditionally do bpf_xdp_adjust_meta with -XDP_METADATA_SIZE (Stanislav)
V1: https://lore.kernel.org/netdev/20250701042940.3272325-1-yoong.siang.song@intel.com/
Song Yoong Siang (2):
doc: enhance explanation of XDP Rx metadata layout and METADATA_SIZE
selftests/bpf: Enhance XDP Rx metadata handling
Documentation/networking/xdp-rx-metadata.rst | 36 +++++++++++++++----
.../selftests/bpf/prog_tests/xdp_metadata.c | 2 +-
.../selftests/bpf/progs/xdp_hw_metadata.c | 2 +-
.../selftests/bpf/progs/xdp_metadata.c | 2 +-
tools/testing/selftests/bpf/xdp_hw_metadata.c | 2 +-
tools/testing/selftests/bpf/xdp_metadata.h | 7 ++++
6 files changed, 41 insertions(+), 10 deletions(-)
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2.34.1