[PATCH bpf-next v4 0/7] Add bpf programmable net device

[Daniel Borkmann <daniel@iogearbox.net>]

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!

v3 -> v4:
  - Moved netkit_release_all() into ndo_uninit (Stan)
  - Two small commit msg corrections (Toke)
  - Added Acked/Reviewed-by
v2 -> v3:
  - Remove setting dev->min_mtu to ETH_MIN_MTU (Andrew)
  - Do not populate ethtool info->version (Andrew)
  - Populate netdev private data before register_netdevice (Andrew)
  - Use strscpy for ifname template (Jakub)
  - Use GFP_KERNEL_ACCOUNT for link kzalloc (Jakub)
  - Carry and dump link attach type for bpftool (Toke)
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                          | 940 ++++++++++++++++++
 include/net/netkit.h                          |  38 +
 include/uapi/linux/bpf.h                      |  14 +
 include/uapi/linux/if_link.h                  |  24 +
 kernel/bpf/syscall.c                          |  30 +-
 .../bpf/bpftool/Documentation/bpftool-net.rst |   8 +-
 tools/bpf/bpftool/link.c                      |   9 +
 tools/bpf/bpftool/net.c                       |   7 +-
 tools/include/uapi/linux/bpf.h                |  14 +
 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, 2433 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