pull-request: bpf-next 2025-05-02

[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 14 non-merge commits during the last 10 day(s) which contain
a total of 13 files changed, 740 insertions(+), 121 deletions(-).

The main changes are:

1) Avoid skipping or repeating a sk when using a UDP bpf_iter,
   from Jordan Rife.

2) Fixed a crash when a bpf qdisc is set in
   the net.core.default_qdisc, from Amery Hung.

3) A few other fixes in the bpf qdisc, from Amery Hung.
   - Always call qdisc_watchdog_init() in the .init prologue such that
     the .reset/.destroy epilogue can always call qdisc_watchdog_cancel()
     without issue.
   - bpf_qdisc_init_prologue() was incorrectly returning an error
     when the bpf qdisc is set as the default_qdisc and the mq is creating
     the default_qdisc. It is now fixed.

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:

Kuniyuki Iwashima

----------------------------------------------------------------

The following changes since commit 8ff6175139967cd17b2a62bca4b2de2559942b7e:

  bnxt_en: hide CONFIG_DETECT_HUNG_TASK specific code (2025-04-23 14:46:00 -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 30190f82a1a9eb555703879cfe835627cff7a0e2:

  Merge branch 'fix-bpf-qdisc-bugs-and-clean-up' (2025-05-02 15:51:17 -0700)

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

----------------------------------------------------------------
Amery Hung (6):
      bpf: net_sched: Fix using bpf qdisc as default qdisc
      bpf: net_sched: Fix bpf qdisc init prologue when set as default qdisc
      selftests/bpf: Test setting and creating bpf qdisc as default qdisc
      bpf: net_sched: Make some Qdisc_ops ops mandatory
      selftests/bpf: Test attaching a bpf qdisc with incomplete operators
      selftests/bpf: Cleanup bpf qdisc selftests

Feng Yang (1):
      selftests/bpf: Fix compilation errors

Jordan Rife (7):
      bpf: udp: Make mem flags configurable through bpf_iter_udp_realloc_batch
      bpf: udp: Make sure iter->batch always contains a full bucket snapshot
      bpf: udp: Get rid of st_bucket_done
      bpf: udp: Use bpf_udp_iter_batch_item for bpf_udp_iter_state batch items
      bpf: udp: Avoid socket skips and repeats during iteration
      selftests/bpf: Return socket cookies from sock_iter_batch progs
      selftests/bpf: Add tests for bucket resume logic in UDP socket iterators

Martin KaFai Lau (2):
      Merge branch 'bpf-udp-exactly-once-socket-iteration'
      Merge branch 'fix-bpf-qdisc-bugs-and-clean-up'

 include/linux/udp.h                                |   3 +
 net/ipv4/udp.c                                     | 173 +++++---
 net/sched/bpf_qdisc.c                              |  24 +-
 net/sched/sch_api.c                                |   4 +-
 net/sched/sch_generic.c                            |   4 +-
 tools/testing/selftests/bpf/prog_tests/bpf_qdisc.c | 119 ++++--
 .../selftests/bpf/prog_tests/sock_iter_batch.c     | 447 ++++++++++++++++++++-
 .../testing/selftests/bpf/progs/bpf_qdisc_common.h |   6 +-
 .../bpf/progs/bpf_qdisc_fail__incompl_ops.c        |  41 ++
 tools/testing/selftests/bpf/progs/bpf_qdisc_fifo.c |   9 +
 tools/testing/selftests/bpf/progs/bpf_qdisc_fq.c   |   6 +
 .../testing/selftests/bpf/progs/bpf_tracing_net.h  |   1 +
 .../testing/selftests/bpf/progs/sock_iter_batch.c  |  24 +-
 13 files changed, 740 insertions(+), 121 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_qdisc_fail__incompl_ops.c