[xdp-hints] [PATCH bpf-next v2 00/20] XDP metadata via kfuncs for ice

[Larysa Zaremba <larysa.zaremba@intel.com>]

This series introduces XDP hints via kfuncs [0] to the ice driver.

Series brings the following existing hints to the ice driver:
 - HW timestamp
 - RX hash with type

Series also introduces new hints and adds their implementation
to ice and veth:
 - VLAN tag with protocol
 - Checksum level

The data above can now be accessed by XDP and userspace (AF_XDP) programs.
They can also be checked with xdp_metadata test and xdp_hw_metadata program.

[0] https://patchwork.kernel.org/project/netdevbpf/cover/20230119221536.3349901-1-sdf@google.com/

v1:
https://lore.kernel.org/all/20230512152607.992209-1-larysa.zaremba@intel.com/

Changes since v1:
- directly return RX hash, RX timestamp and RX checksum status
  in skb-common functions
- use intermediate enum value for checksum status in ice
- get rid of ring structure dependency in ice kfunc implementation
- make variables const, when possible, in ice implementation
- use -ENODATA instead of -EOPNOTSUPP for driver implementation
- instead of having 2 separate functions for c-tag and s-tag,
  use 1 function that outputs both VLAN tag and protocol ID
- improve documentation for introduced hints
- update xdp_metadata selftest to test new hints
- implement new hints in veth, so they can be tested in xdp_metadata
- parse VLAN tag in xdp_hw_metadata

Aleksander Lobakin (1):
  net, xdp: allow metadata > 32

Larysa Zaremba (19):
  ice: make RX hash reading code more reusable
  ice: make RX HW timestamp reading code more reusable
  ice: make RX checksum checking code more reusable
  ice: Make ptype internal to descriptor info processing
  ice: Introduce ice_xdp_buff
  ice: Support HW timestamp hint
  ice: Support RX hash XDP hint
  ice: Support XDP hints in AF_XDP ZC mode
  xdp: Add VLAN tag hint
  ice: Implement VLAN tag hint
  ice: use VLAN proto from ring packet context in skb path
  xdp: Add checksum level hint
  ice: Implement checksum level hint
  selftests/bpf: Allow VLAN packets in xdp_hw_metadata
  selftests/bpf: Add flags and new hints to xdp_hw_metadata
  veth: Implement VLAN tag and checksum level XDP hint
  selftests/bpf: Use AF_INET for TX in xdp_metadata
  selftests/bpf: Check VLAN tag and proto in xdp_metadata
  selftests/bpf: check checksum level in xdp_metadata

 Documentation/networking/xdp-rx-metadata.rst  |  11 +-
 drivers/net/ethernet/intel/ice/ice.h          |   2 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |   2 +-
 .../net/ethernet/intel/ice/ice_lan_tx_rx.h    | 412 +++++++++---------
 drivers/net/ethernet/intel/ice/ice_lib.c      |   2 +-
 drivers/net/ethernet/intel/ice/ice_main.c     |  23 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  26 +-
 drivers/net/ethernet/intel/ice/ice_ptp.h      |  15 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  15 +-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  29 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 339 +++++++++++---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  16 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  18 +-
 drivers/net/veth.c                            |  40 ++
 include/linux/netdevice.h                     |   3 +
 include/linux/skbuff.h                        |  13 +-
 include/net/xdp.h                             |  14 +-
 kernel/bpf/offload.c                          |   4 +
 net/core/xdp.c                                |  41 ++
 tools/testing/selftests/bpf/network_helpers.c |  37 +-
 tools/testing/selftests/bpf/network_helpers.h |   3 +
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 195 ++++-----
 .../selftests/bpf/progs/xdp_hw_metadata.c     |  45 +-
 .../selftests/bpf/progs/xdp_metadata.c        |  11 +
 tools/testing/selftests/bpf/xdp_hw_metadata.c |  42 +-
 tools/testing/selftests/bpf/xdp_metadata.h    |  36 +-
 26 files changed, 953 insertions(+), 441 deletions(-)

-- 
2.41.0