Add bpf programmable net device [LWN.net]

From:		Daniel Borkmann <daniel-AT-iogearbox.net>
To:		bpf-AT-vger.kernel.org
Subject:		[PATCH bpf-next v2 0/7] Add bpf programmable net device
Date:		Thu, 19 Oct 2023 22:49:12 +0200
Message-ID:		<20231019204919.4203-1-daniel@iogearbox.net>
Cc:		netdev-AT-vger.kernel.org, martin.lau-AT-linux.dev, razor-AT-blackwall.org, ast-AT-kernel.org, andrii-AT-kernel.org, john.fastabend-AT-gmail.com, sdf-AT-google.com, toke-AT-kernel.org, Daniel Borkmann <daniel-AT-iogearbox.net>
Archive-link:		Article

This work adds a BPF programmable device which can operate in L3 or L2
mode where the BPF program is part of the xmit routine. It's program
management is done via bpf_mprog and it comes with BPF link support.
For details see patch 1 and following. Thanks!

v1 -> v2:
  - Rename from meta (Toke, Andrii, Alexei)
  - Reuse skb_scrub_packet (Stan)
  - Remove IFF_META and use netdev_ops (Toke)
  - Add comment to multicast handler (Toke)
  - Remove silly version info (Toke)
  - Fix attach_type_name (Quentin)
  - Rework libbpf link attach api to be similar
    as tcx (Andrii)
  - Move flags last for bpf_netkit_opts (Andrii)
  - Rebased to bpf_mprog query api changes
  - Folded link support patch into main one

Daniel Borkmann (7):
  netkit, bpf: Add bpf programmable net device
  tools: Sync if_link uapi header
  libbpf: Add link-based API for netkit
  bpftool: Implement link show support for netkit
  bpftool: Extend net dump with netkit progs
  selftests/bpf: Add netlink helper library
  selftests/bpf: Add selftests for netkit

 MAINTAINERS                                   |   9 +
 drivers/net/Kconfig                           |   9 +
 drivers/net/Makefile                          |   1 +
 drivers/net/netkit.c                          | 926 ++++++++++++++++++
 include/net/netkit.h                          |  38 +
 include/uapi/linux/bpf.h                      |  13 +
 include/uapi/linux/if_link.h                  |  24 +
 kernel/bpf/syscall.c                          |  30 +-
 .../bpf/bpftool/Documentation/bpftool-net.rst |   8 +-
 tools/bpf/bpftool/link.c                      |   7 +
 tools/bpf/bpftool/net.c                       |   7 +-
 tools/include/uapi/linux/bpf.h                |  13 +
 tools/include/uapi/linux/if_link.h            | 141 +++
 tools/lib/bpf/bpf.c                           |  16 +
 tools/lib/bpf/bpf.h                           |   5 +
 tools/lib/bpf/libbpf.c                        |  39 +
 tools/lib/bpf/libbpf.h                        |  15 +
 tools/lib/bpf/libbpf.map                      |   1 +
 tools/testing/selftests/bpf/Makefile          |  19 +-
 tools/testing/selftests/bpf/config            |   1 +
 tools/testing/selftests/bpf/netlink_helpers.c | 358 +++++++
 tools/testing/selftests/bpf/netlink_helpers.h |  46 +
 .../selftests/bpf/prog_tests/tc_helpers.h     |   4 +
 .../selftests/bpf/prog_tests/tc_netkit.c      | 687 +++++++++++++
 .../selftests/bpf/progs/test_tc_link.c        |  13 +
 25 files changed, 2415 insertions(+), 15 deletions(-)
 create mode 100644 drivers/net/netkit.c
 create mode 100644 include/net/netkit.h
 create mode 100644 tools/testing/selftests/bpf/netlink_helpers.c
 create mode 100644 tools/testing/selftests/bpf/netlink_helpers.h
 create mode 100644 tools/testing/selftests/bpf/prog_tests/tc_netkit.c

-- 
2.34.1