Merge tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Alexei Starovoitov says:

====================
pull-request: bpf-next 2023-07-19

We've added 45 non-merge commits during the last 3 day(s) which contain
a total of 71 files changed, 7808 insertions(+), 592 deletions(-).

The main changes are:

1) multi-buffer support in AF_XDP, from Maciej Fijalkowski,
   Magnus Karlsson, Tirthendu Sarkar.

2) BPF link support for tc BPF programs, from Daniel Borkmann.

3) Enable bpf_map_sum_elem_count kfunc for all program types,
   from Anton Protopopov.

4) Add 'owner' field to bpf_rb_node to fix races in shared ownership,
   Dave Marchevsky.

5) Prevent potential skb_header_pointer() misuse, from Alexei Starovoitov.

* tag 'for-netdev' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (45 commits)
  bpf, net: Introduce skb_pointer_if_linear().
  bpf: sync tools/ uapi header with
  selftests/bpf: Add mprog API tests for BPF tcx links
  selftests/bpf: Add mprog API tests for BPF tcx opts
  bpftool: Extend net dump with tcx progs
  libbpf: Add helper macro to clear opts structs
  libbpf: Add link-based API for tcx
  libbpf: Add opts-based attach/detach/query API for tcx
  bpf: Add fd-based tcx multi-prog infra with link support
  bpf: Add generic attach/detach/query API for multi-progs
  selftests/xsk: reset NIC settings to default after running test suite
  selftests/xsk: add test for too many frags
  selftests/xsk: add metadata copy test for multi-buff
  selftests/xsk: add invalid descriptor test for multi-buffer
  selftests/xsk: add unaligned mode test for multi-buffer
  selftests/xsk: add basic multi-buffer test
  selftests/xsk: transmit and receive multi-buffer packets
  xsk: add multi-buffer documentation
  i40e: xsk: add TX multi-buffer support
  ice: xsk: Tx multi-buffer support
  ...
====================

Link: https://lore.kernel.org/r/20230719175424.75717-1-alexei.starovoitov@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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