netdev - [RFC net-next v4 0/8] xsk: TX metadata

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Date: Mon, 24 Jul 2023 16:59:49 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com, 
	kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org, 
	kuba@...nel.org, toke@...nel.org, willemb@...gle.com, dsahern@...nel.org, 
	magnus.karlsson@...el.com, bjorn@...nel.org, maciej.fijalkowski@...el.com, 
	hawk@...nel.org, netdev@...r.kernel.org, xdp-hints@...-project.net
Subject: [RFC net-next v4 0/8] xsk: TX metadata

This series implements initial TX metadata (offloads) for AF_XDP.
See patch #2 for the main implementation and mlx5-one for the
example on how to consume the metadata on the device side.

With v4, I'm switching from BPF hooks and kfuncs to a fixed TX
metadata/offload format: the metadata is passed with every tx
umem chunk and it's up to the device driver to interpret it.

Starting with two types of offloads:
- request TX timestamp (and write it back into the metadata area)
- request TX checksum offload

TODO for the non-RFC series:
- have some real device support to verify xdp_hw_metadata works
- Documentation/networking/xdp-rx-metadata.rst - like documentation

v3: https://lore.kernel.org/bpf/20230707193006.1309662-1-sdf@google.com/

Stanislav Fomichev (8):
  xsk: Support XDP_TX_METADATA_LEN
  xsk: add TX timestamp and TX checksum offload support
  net/mlx5e: Implement AF_XDP TX timestamp and checksum offload
  tools: ynl: update netdev sample to dump xsk-features
  selftests/xsk: Support XDP_TX_METADATA_LEN
  selftests/bpf: Add csum helpers
  selftests/bpf: Add TX side to xdp_metadata
  selftests/bpf: Add TX side to xdp_hw_metadata

 Documentation/netlink/specs/netdev.yaml       |  25 ++-
 drivers/net/ethernet/mellanox/mlx5/core/en.h  |   4 +-
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  |  71 ++++++-
 .../net/ethernet/mellanox/mlx5/core/en/xdp.h  |  10 +-
 .../ethernet/mellanox/mlx5/core/en/xsk/tx.c   |   9 +-
 .../net/ethernet/mellanox/mlx5/core/en_main.c |   1 +
 include/linux/netdevice.h                     |  27 +++
 include/linux/skbuff.h                        |   5 +-
 include/net/xdp_sock.h                        |  61 ++++++
 include/net/xdp_sock_drv.h                    |  13 ++
 include/net/xsk_buff_pool.h                   |   1 +
 include/uapi/linux/if_xdp.h                   |  36 ++++
 include/uapi/linux/netdev.h                   |  15 ++
 net/core/netdev-genl.c                        |  12 +-
 net/xdp/xsk.c                                 |  58 +++++
 net/xdp/xsk_buff_pool.c                       |   1 +
 net/xdp/xsk_queue.h                           |  19 +-
 tools/include/uapi/linux/if_xdp.h             |  50 ++++-
 tools/include/uapi/linux/netdev.h             |  15 ++
 tools/net/ynl/generated/netdev-user.c         |  25 +++
 tools/net/ynl/generated/netdev-user.h         |   5 +
 tools/net/ynl/samples/netdev.c                |   8 +
 tools/testing/selftests/bpf/network_helpers.h |  43 ++++
 .../selftests/bpf/prog_tests/xdp_metadata.c   |  31 ++-
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 201 +++++++++++++++++-
 tools/testing/selftests/bpf/xsk.c             |  17 ++
 tools/testing/selftests/bpf/xsk.h             |   1 +
 27 files changed, 718 insertions(+), 46 deletions(-)

-- 
2.41.0.487.g6d72f3e995-goog