netdev - [PATCH bpf-next v6 0/3] bpf: misc performance improvements for cgroup hooks

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Message-Id: <20210108210223.972802-1-sdf@google.com>
Date:   Fri,  8 Jan 2021 13:02:20 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v6 0/3] bpf: misc performance improvements for cgroup hooks

First patch adds custom getsockopt for TCP_ZEROCOPY_RECEIVE
to remove kmalloc and lock_sock overhead from the dat path.

Second patch removes kzalloc/kfree from getsockopt for the common cases.

Third patch switches cgroup_bpf_enabled to be per-attach to
to add only overhead for the cgroup attach types used on the system.

No visible user-side changes.

v6:
- avoid indirect cost for new bpf_bypass_getsockopt (Eric Dumazet)

v5:
- reorder patches to reduce the churn (Martin KaFai Lau)

v4:
- update performance numbers
- bypass_bpf_getsockopt (Martin KaFai Lau)

v3:
- remove extra newline, add comment about sizeof tcp_zerocopy_receive
  (Martin KaFai Lau)
- add another patch to remove lock_sock overhead from
  TCP_ZEROCOPY_RECEIVE; technically, this makes patch #1 obsolete,
  but I'd still prefer to keep it to help with other socket
  options

v2:
- perf numbers for getsockopt kmalloc reduction (Song Liu)
- (sk) in BPF_CGROUP_PRE_CONNECT_ENABLED (Song Liu)
- 128 -> 64 buffer size, BUILD_BUG_ON (Martin KaFai Lau)

Stanislav Fomichev (3):
  bpf: remove extra lock_sock for TCP_ZEROCOPY_RECEIVE
  bpf: try to avoid kzalloc in cgroup/{s,g}etsockopt
  bpf: split cgroup_bpf_enabled per attach type

 include/linux/bpf-cgroup.h                    |  63 +++++++----
 include/linux/filter.h                        |   5 +
 include/linux/indirect_call_wrapper.h         |   6 +
 include/net/sock.h                            |   2 +
 include/net/tcp.h                             |   1 +
 kernel/bpf/cgroup.c                           | 104 +++++++++++++++---
 net/ipv4/af_inet.c                            |   9 +-
 net/ipv4/tcp.c                                |  14 +++
 net/ipv4/tcp_ipv4.c                           |   1 +
 net/ipv4/udp.c                                |   7 +-
 net/ipv6/af_inet6.c                           |   9 +-
 net/ipv6/tcp_ipv6.c                           |   1 +
 net/ipv6/udp.c                                |   7 +-
 net/socket.c                                  |   3 +
 .../selftests/bpf/prog_tests/sockopt_sk.c     |  22 ++++
 .../testing/selftests/bpf/progs/sockopt_sk.c  |  15 +++
 16 files changed, 217 insertions(+), 52 deletions(-)

-- 
2.30.0.284.gd98b1dd5eaa7-goog