[PATCH net-next v3 0/5] bnxt_en: Add XDP RSS hash metadata support

[Chris J Arges <carges@cloudflare.com>]

This series adds XDP RSS hash metadata extraction support for the bnxt_en
driver and includes selftests to validate the functionality. I was able
to test this on a BCM57414 NIC.

Note: I don't have hardware to test v3 completions at the moment.

Patches 1-3 implement the driver support:
  - Patch 1 adds bnxt_xdp_buff to wrap xdp_buff with
    pointers to the hardware RX completion descriptors and the
    completion type. This is similar to other driver implementations.
  - Patch 2 adds the xmo_rx_hash callback for CMP_TYPE_RX_L2_CMP completions.
  - Patch 3 adds handling for CMP_TYPE_RX_L2_V3_CMP completions

Patches 4-5 add selftest coverage:
  - Patch 4 refactors common BPF map helper functions out of the
    existing xdp.py selftest into a shared net/lib/py/bpf.py module.
  - Patch 5 adds an XDP metadata selftest that loads an XDP program
    calling bpf_xdp_metadata_rx_hash. The test skips on devices without
    xdp-rx-metadata-features.

v2: https://lore.kernel.org/netdev/20260303024510.644962-1-carges@cloudflare.com/
  - bnxt xdp: actually fixed RCT issues
  - bnxt xdp: Added patch 3 to handle CMP_TYPE_RX_L2_V3_CMP completions.

v1: https://lore.kernel.org/netdev/cover.1772211065.git.carges@cloudflare.com/
  - selftests: moved tests into net/hw
  - selftests: fix pylinter errors
  - selftests: add check for no error count
  - bnxt_xdp: followed RCT for variable declaration
  - rebased on net-next

Chris J Arges (5):
  bnxt_en: use bnxt_xdp_buff for xdp context
  bnxt_en: Implement XDP RSS hash metadata extraction
  bnxt_en: Implement XDP RSS hash metadata extraction for V3_CMP
  selftests: net: move common xdp.py functions into lib
  selftests: drv-net: xdp: Add rss_hash metadata tests

 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  30 ++--
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |   2 +
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c |  67 +++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.h |  10 ++
 .../testing/selftests/drivers/net/hw/Makefile |   1 +
 .../drivers/net/hw/lib/py/__init__.py         |   2 +
 .../selftests/drivers/net/hw/xdp_metadata.py  | 146 ++++++++++++++++
 .../selftests/drivers/net/lib/py/__init__.py  |   2 +
 tools/testing/selftests/drivers/net/xdp.py    |  95 +++-------
 .../testing/selftests/net/lib/py/__init__.py  |   2 +
 tools/testing/selftests/net/lib/py/bpf.py     |  68 ++++++++
 .../selftests/net/lib/xdp_metadata.bpf.c      | 163 ++++++++++++++++++
 12 files changed, 506 insertions(+), 82 deletions(-)
 create mode 100644 tools/testing/selftests/drivers/net/hw/xdp_metadata.py
 create mode 100644 tools/testing/selftests/net/lib/py/bpf.py
 create mode 100644 tools/testing/selftests/net/lib/xdp_metadata.bpf.c

--
2.43.0