pull-request: bpf-next 2025-09-23

[Martin KaFai Lau <martin.lau@linux.dev>]

Hi David, hi Jakub, hi Paolo, hi Eric,

The following pull-request contains BPF updates for your *net-next* tree.

We've added 9 non-merge commits during the last 33 day(s) which contain
a total of 10 files changed, 480 insertions(+), 53 deletions(-).

The main changes are:

1) A new bpf_xdp_pull_data kfunc that supports pulling data from
   a frag into the linear area of a xdp_buff, from Amery Hung.

   This includes changes in the xdp_native.bpf.c selftest, which
   Nimrod's future work depends on.

   It is a merge from a stable branch 'xdp_pull_data' which has
   also been merged to bpf-next.

   There is a conflict with recent changes in 'include/net/xdp.h'
   in the net-next tree that will need to be resolved.

2) A compiler warning fix when CONFIG_NET=n in the recent dynptr
   skb_meta support, from Jakub Sitnicki.

Please consider pulling these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git tags/for-netdev

Thanks a lot!

Also thanks to reporters, reviewers and testers of commits in this pull-request:

Jakub Kicinski, Maciej Fijalkowski

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The following changes since commit 02614eee26fbdfd73b944769001cefeff6ed008c:

  idpf: do not linearize big TSO packets (2025-08-22 10:37:18 -0700)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git tags/for-netdev

for you to fetch changes up to 55d5a5154d751023bdf12c196fb0f1accdacf300:

  Merge branch 'bpf-next/xdp_pull_data' into 'bpf-next/net' (2025-09-23 15:46:52 -0700)

----------------------------------------------------------------
bpf-next-for-netdev

----------------------------------------------------------------
Amery Hung (8):
      bpf: Clear pfmemalloc flag when freeing all fragments
      bpf: Allow bpf_xdp_shrink_data to shrink a frag from head and tail
      bpf: Support pulling non-linear xdp data
      bpf: Clear packet pointers after changing packet data in kfuncs
      bpf: Make variables in bpf_prog_test_run_xdp less confusing
      bpf: Support specifying linear xdp packet data size for BPF_PROG_TEST_RUN
      selftests/bpf: Test bpf_xdp_pull_data
      selftests: drv-net: Pull data before parsing headers

Jakub Sitnicki (1):
      bpf: Return an error pointer for skb metadata when CONFIG_NET=n

Martin KaFai Lau (3):
      Merge branch 'bpf-next/skb-meta-dynptr' into 'bpf-next/net'
      Merge branch 'add-kfunc-bpf_xdp_pull_data'
      Merge branch 'bpf-next/xdp_pull_data' into 'bpf-next/net'

 include/linux/filter.h                             |   2 +-
 include/net/xdp.h                                  |   5 +
 include/net/xdp_sock_drv.h                         |  21 ++-
 kernel/bpf/verifier.c                              |  13 ++
 net/bpf/test_run.c                                 |  37 +++--
 net/core/filter.c                                  | 135 ++++++++++++++--
 .../bpf/prog_tests/xdp_context_test_run.c          |   4 +-
 .../selftests/bpf/prog_tests/xdp_pull_data.c       | 179 +++++++++++++++++++++
 .../selftests/bpf/progs/test_xdp_pull_data.c       |  48 ++++++
 tools/testing/selftests/net/lib/xdp_native.bpf.c   |  89 ++++++++--
 10 files changed, 480 insertions(+), 53 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_pull_data.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_pull_data.c