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Message-ID: <20221213023605.737383-1-sdf@google.com>
Date: Mon, 12 Dec 2022 18:35:50 -0800
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,
David Ahern <dsahern@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Willem de Bruijn <willemb@...gle.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Anatoly Burakov <anatoly.burakov@...el.com>,
Alexander Lobakin <alexandr.lobakin@...el.com>,
Magnus Karlsson <magnus.karlsson@...il.com>,
Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
netdev@...r.kernel.org
Subject: [PATCH bpf-next v4 00/15] xdp: hints via kfuncs
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:
- Drop _supported kfuncs, return status from the existing ones,
return the actual payload via arguments (Jakub)
- Use 'device-bound' instead of 'offloaded' in existing error message (Jakub)
- Move offload init into late_initcall (Jakub)
- Separate xdp_metadata_ops to host netdev kfunc pointers (Jakub)
- Remove forward declarations (Jakub)
- Rename more offload routines to dev_bound (Jakub)
bpf_offload_resolve_kfunc -> bpf_dev_bound_resolve_kfunc
bpf_offload_bound_netdev_unregister -> bpf_dev_bound_netdev_unregister
bpf_prog_offload_init -> bpf_prog_dev_bound_init
bpf_prog_offload_destroy -> bpf_prog_dev_bound_destroy
maybe_remove_bound_netdev -> bpf_dev_bound_try_remove_netdev
- Move bpf_prog_is_dev_bound check into bpf_prog_map_compatible (Toke)
- Prohibit metadata kfuncs unless device-bound (Toke)
- Adjust selftest to exercise freplace + include the path (Toke)
- Take rtnl in bpf_prog_offload_destroy to avoid the race (Martin)
- BPF_F_XDP_HAS_METADATA -> BPF_F_XDP_DEV_BOUND_ONLY (Martin)
- Prohibit only metadata kfuncs, not all (Alexei/Martin)
- Try to fix xdp_hw_metadata.c build issue on CI (Alexei)
Wasn't able to reproduce it locally, so trying my best guess...
- mlx4 -> mlx4_en (Tariq)
Plus other issues like using net/mlx4 prefix and using mlx4_en_xdp_buff
instead of mlx4_xdp_buff. Applied those same patterns to mlx5.
- Separate device-bound changes into separate patch to make it easier to
review
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/
- 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@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: Anatoly Burakov <anatoly.burakov@...el.com>
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>
Cc: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: Maryam Tahhan <mtahhan@...hat.com>
Cc: xdp-hints@...-project.net
Cc: netdev@...r.kernel.org
Stanislav Fomichev (11):
bpf: Document XDP RX metadata
bpf: Rename bpf_{prog,map}_is_dev_bound to is_offloaded
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
Toke Høiland-Jørgensen (4):
bpf: Support consuming XDP HW metadata from fext programs
xsk: Add cb area to struct xdp_buff_xsk
net/mlx5e: Introduce wrapper for xdp_buff
net/mlx5e: Support RX XDP metadata
Documentation/bpf/xdp-rx-metadata.rst | 90 ++++
drivers/net/ethernet/mellanox/mlx4/en_clock.c | 13 +-
.../net/ethernet/mellanox/mlx4/en_netdev.c | 6 +
drivers/net/ethernet/mellanox/mlx4/en_rx.c | 63 ++-
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 5 +
drivers/net/ethernet/mellanox/mlx5/core/en.h | 11 +-
.../net/ethernet/mellanox/mlx5/core/en/xdp.c | 26 +-
.../net/ethernet/mellanox/mlx5/core/en/xdp.h | 11 +-
.../ethernet/mellanox/mlx5/core/en/xsk/rx.c | 35 +-
.../ethernet/mellanox/mlx5/core/en/xsk/rx.h | 2 +
.../net/ethernet/mellanox/mlx5/core/en_main.c | 6 +
.../net/ethernet/mellanox/mlx5/core/en_rx.c | 99 +++--
drivers/net/netdevsim/bpf.c | 4 -
drivers/net/veth.c | 80 ++--
include/linux/bpf.h | 39 +-
include/linux/netdevice.h | 7 +
include/net/xdp.h | 25 ++
include/net/xsk_buff_pool.h | 5 +
include/uapi/linux/bpf.h | 5 +
kernel/bpf/core.c | 11 +-
kernel/bpf/offload.c | 360 +++++++++------
kernel/bpf/syscall.c | 35 +-
kernel/bpf/verifier.c | 56 ++-
net/core/dev.c | 9 +-
net/core/filter.c | 2 +-
net/core/xdp.c | 44 ++
tools/include/uapi/linux/bpf.h | 5 +
tools/testing/selftests/bpf/.gitignore | 1 +
tools/testing/selftests/bpf/Makefile | 8 +-
.../selftests/bpf/prog_tests/xdp_metadata.c | 412 ++++++++++++++++++
.../selftests/bpf/progs/xdp_hw_metadata.c | 81 ++++
.../selftests/bpf/progs/xdp_metadata.c | 56 +++
.../selftests/bpf/progs/xdp_metadata2.c | 23 +
tools/testing/selftests/bpf/test_offload.py | 10 +-
tools/testing/selftests/bpf/xdp_hw_metadata.c | 405 +++++++++++++++++
tools/testing/selftests/bpf/xdp_metadata.h | 15 +
36 files changed, 1780 insertions(+), 285 deletions(-)
create mode 100644 Documentation/bpf/xdp-rx-metadata.rst
create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
create mode 100644 tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
create mode 100644 tools/testing/selftests/bpf/progs/xdp_metadata.c
create mode 100644 tools/testing/selftests/bpf/progs/xdp_metadata2.c
create mode 100644 tools/testing/selftests/bpf/xdp_hw_metadata.c
create mode 100644 tools/testing/selftests/bpf/xdp_metadata.h
--
2.39.0.rc1.256.g54fd8350bd-goog
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