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Stanislav Fomichev says: ==================== Please see the first patch in the series for the overall design and use-cases. See the following email from Toke for the per-packet metadata overhead: https://lore.kernel.org/bpf/20221206024554.3826186-1-sdf@google.com/T/#m49d48ea08d525ec88360c7d14c4d34fb0e45e798 Recent changes: - Keep new functions in en/xdp.c, do 'extern mlx5_xdp_metadata_ops' (Tariq) - Remove mxbuf pointer and use xsk_buff_to_mxbuf (Tariq) - Clarify xdp_buff vs 'XDP frame' (Jesper) - Explicitly mention that AF_XDP RX descriptor lacks metadata size (Jesper) - Drop libbpf_flags/xdp_flags from selftests and use ifindex instead of ifname (due to recent xsk.h refactoring) Prior art (to record pros/cons for different approaches): - Stable UAPI approach: https://lore.kernel.org/bpf/20220628194812.1453059-1-alexandr.lobakin@intel.com/ - Metadata+BTF_ID appoach: https://lore.kernel.org/bpf/166256538687.1434226.15760041133601409770.stgit@firesoul/ - v7: https://lore.kernel.org/bpf/20230112003230.3779451-1-sdf@google.com/ - v6: https://lore.kernel.org/bpf/20230104215949.529093-1-sdf@google.com/ - v5: https://lore.kernel.org/bpf/20221220222043.3348718-1-sdf@google.com/ - v4: https://lore.kernel.org/bpf/20221213023605.737383-1-sdf@google.com/ - v3: https://lore.kernel.org/bpf/20221206024554.3826186-1-sdf@google.com/ - v2: https://lore.kernel.org/bpf/20221121182552.2152891-1-sdf@google.com/ - v1: https://lore.kernel.org/bpf/20221115030210.3159213-1-sdf@google.com/ - kfuncs v2 RFC: https://lore.kernel.org/bpf/20221027200019.4106375-1-sdf@google.com/ - kfuncs v1 RFC: https://lore.kernel.org/bpf/20221104032532.1615099-1-sdf@google.com/ Cc: John Fastabend <john.fastabend@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Willem de Bruijn <willemb@google.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Anatoly Burakov <anatoly.burakov@intel.com> Cc: Alexander Lobakin <alexandr.lobakin@intel.com> Cc: Magnus Karlsson <magnus.karlsson@gmail.com> Cc: Maryam Tahhan <mtahhan@redhat.com> Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Stanislav Fomichev (13): bpf: Document XDP RX metadata bpf: Rename bpf_{prog,map}_is_dev_bound to is_offloaded bpf: Move offload initialization into late_initcall bpf: Reshuffle some parts of bpf/offload.c bpf: Introduce device-bound XDP programs selftests/bpf: Update expected test_offload.py messages bpf: XDP metadata RX kfuncs veth: Introduce veth_xdp_buff wrapper for xdp_buff veth: Support RX XDP metadata selftests/bpf: Verify xdp_metadata xdp->af_xdp path net/mlx4_en: Introduce wrapper for xdp_buff net/mlx4_en: Support RX XDP metadata selftests/bpf: Simple program to dump XDP RX metadata ==================== Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.