pull-request: bpf-next 2024-09-11

[Daniel Borkmann <daniel@iogearbox.net>]

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

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

We've added 12 non-merge commits during the last 16 day(s) which contain
a total of 20 files changed, 228 insertions(+), 30 deletions(-).

There's a minor merge conflict in netkit driver, resolve as follows
(https://lore.kernel.org/bpf/2444df33-cd03-a929-9ce8-3cf1376d3f78@iogearbox.net):

  	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
  	dev->priv_flags |= IFF_PHONY_HEADROOM;
  	dev->priv_flags |= IFF_NO_QUEUE;
+ 	dev->priv_flags |= IFF_DISABLE_NETPOLL;
 +	dev->lltx = true;
  
  	dev->ethtool_ops = &netkit_ethtool_ops;
  	dev->netdev_ops  = &netkit_netdev_ops;

The main changes are:

1) Enable bpf_dynptr_from_skb for tp_btf such that this can be used to easily
   parse skbs in BPF programs attached to tracepoints, from Philo Lu.

2) Add a cond_resched() point in BPF's sock_hash_free() as there have been
   several syzbot soft lockup reports recently, from Eric Dumazet.

3) Fix xsk_buff_can_alloc() to account for queue_empty_descs which got noticed
   when zero copy ice driver started to use it, from Maciej Fijalkowski.

4) Move the xdp:xdp_cpumap_kthread tracepoint before cpumap pushes skbs up via
   netif_receive_skb_list() to better measure latencies, from Daniel Xu.

5) Follow-up to disable netpoll support from netkit, from Daniel Borkmann.

6) Improve xsk selftests to not assume a fixed MAX_SKB_FRAGS of 17 but instead
   gather the actual value via /proc/sys/net/core/max_skb_frags, also from
   Maciej Fijalkowski.

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:

Breno Leitao, Cong Wang, Jakub Kicinski, Jakub Sitnicki, Jesper Dangaard 
Brouer, John Fastabend, Magnus Karlsson, Martin KaFai Lau, Nikolay 
Aleksandrov, Stanislav Fomichev, syzbot

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

The following changes since commit f8fdda9e4f988c210b1e4519a28ddbf7d29b0038:

  Merge branch 'tc-adjust-network-header-after-2nd-vlan-push' (2024-08-27 11:37:46 +0200)

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 b1339be951ad31947ae19bc25cb08769bf255100:

  sock_map: Add a cond_resched() in sock_hash_free() (2024-09-11 22:16:04 +0200)

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

----------------------------------------------------------------
Daniel Borkmann (1):
      netkit: Disable netpoll support

Daniel Xu (1):
      bpf, cpumap: Move xdp:xdp_cpumap_kthread tracepoint before rcv

Eric Dumazet (1):
      sock_map: Add a cond_resched() in sock_hash_free()

Maciej Fijalkowski (2):
      xsk: Bump xsk_queue::queue_empty_descs in xp_can_alloc()
      selftests/xsk: Read current MAX_SKB_FRAGS from sysctl knob

Martin KaFai Lau (1):
      Merge branch 'bpf: Allow skb dynptr for tp_btf'

Philo Lu (5):
      bpf: Support __nullable argument suffix for tp_btf
      selftests/bpf: Add test for __nullable suffix in tp_btf
      tcp: Use skb__nullable in trace_tcp_send_reset
      bpf: Allow bpf_dynptr_from_skb() for tp_btf
      selftests/bpf: Expand skb dynptr selftests for tp_btf

Simon Horman (1):
      bpf, sockmap: Correct spelling skmsg.c

Yaxin Chen (1):
      tcp_bpf: Remove an unused parameter for bpf_tcp_ingress()

 drivers/net/netkit.c                               |  1 +
 include/trace/events/tcp.h                         | 12 +++---
 kernel/bpf/btf.c                                   |  3 ++
 kernel/bpf/cpumap.c                                |  6 ++-
 kernel/bpf/verifier.c                              | 36 ++++++++++++++++--
 net/core/filter.c                                  |  3 +-
 net/core/skmsg.c                                   |  2 +-
 net/core/sock_map.c                                |  1 +
 net/ipv4/tcp_bpf.c                                 |  4 +-
 net/xdp/xsk_buff_pool.c                            | 10 ++++-
 net/xdp/xsk_queue.h                                |  5 ---
 .../selftests/bpf/bpf_testmod/bpf_testmod-events.h |  6 +++
 .../selftests/bpf/bpf_testmod/bpf_testmod.c        |  2 +
 tools/testing/selftests/bpf/prog_tests/dynptr.c    | 37 ++++++++++++++++++-
 .../selftests/bpf/prog_tests/tp_btf_nullable.c     | 14 +++++++
 tools/testing/selftests/bpf/progs/dynptr_fail.c    | 25 +++++++++++++
 tools/testing/selftests/bpf/progs/dynptr_success.c | 23 ++++++++++++
 .../selftests/bpf/progs/test_tp_btf_nullable.c     | 24 ++++++++++++
 tools/testing/selftests/bpf/xskxceiver.c           | 43 +++++++++++++++++++---
 tools/testing/selftests/bpf/xskxceiver.h           |  1 -
 20 files changed, 228 insertions(+), 30 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/tp_btf_nullable.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_tp_btf_nullable.c