[PATCH mptcp-next v8 00/17] BPF packet scheduler updates

[Geliang Tang <geliang.tang@suse.com>]

v8:
 address Paolo's comments in v7:
 - add sched_data into mptcp_sock as new field, not an pointer.
 - drop rename __mptcp_set_timeout, export mptcp_set_timeout into BPF
   context instead.
 - add a comment in bpf_burst to explan why not use
   "ssk = send_info[SSK_MODE_ACTIVE].ssk;" directly.
 - move mptcp_subflow_tcp_sock into bpf_tcp_helpers.h.

v7:
 - drop more last_snd, only set it in bpf_rr.
 - 1-10: save sched_data at mptcp_sock, for issues #342
 - 11-16: add bpf_burst scheduler
 - 17-19: add bpf_stale scheduler, for issues #349

v6:
 - Only update patches 14, 15. Add a helper bpf_mptcp_subflow_ctx, fix
   bug in bpf_burst_get_retrans().

v5:
 - 1-9: save sched_data at mptcp_sock, for issues #342
 - 10-15: add bpf_burst scheduler
 - 16-18: add bpf_stale scheduler, for issues #349

v4:
 - drop "mptcp: add three helpers for bpf_burst", implement the helpers
   in the bpf context directly.

v3:
 - address Florian's comments in v2.
 - split into three more patches.

v2:
 - fix this error reported by CI:
KASAN: slab-use-after-free in __mptcp_close_ssk (net/mptcp/protocol.c:2461)
 - add bpf burst scheduler.

This patchset adds sched_data pointer into mptcp_sock to to save some
data at MPTCP and subflows levels.

With these changes, the old patch "mptcp: register default scheduler" in
[1] now works.

https://patchwork.kernel.org/project/mptcp/cover/cover.1665753926.git.geliang.tang@suse.com/ [1]
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/342
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/349

Geliang Tang (17):
  Squash to "mptcp: drop last_snd and MPTCP_RESET_SCHEDULER"
  Squash to "mptcp: add struct mptcp_sched_ops"
  Squash to "mptcp: add scheduler wrappers"
  mptcp: add last_snd in sched_data
  mptcp: add snd_burst in sched_data
  mptcp: register default scheduler
  Squash to "bpf: Add bpf_mptcp_sched_ops"
  Squash to "selftests/bpf: Add mptcp sched structs"
  Squash to "selftests/bpf: Add bpf_rr scheduler"
  mptcp: add two wrappers needed by bpf_burst
  bpf: Add bpf_burst write accesses
  bpf: Export more bpf_burst related functions
  selftests/bpf: Add bpf_burst scheduler
  selftests/bpf: Add bpf_burst test
  bpf: Add subflow bit flags write accesses
  selftests/bpf: Add bpf_stale scheduler
  selftests/bpf: Add bpf_stale test

 include/net/mptcp.h                           |   4 +-
 net/mptcp/bpf.c                               |  55 ++++-
 net/mptcp/protocol.c                          |  27 +--
 net/mptcp/protocol.h                          |  11 +-
 net/mptcp/sched.c                             |  56 ++++-
 tools/testing/selftests/bpf/bpf_tcp_helpers.h |  17 +-
 .../testing/selftests/bpf/prog_tests/mptcp.c  |  76 +++++++
 .../selftests/bpf/progs/mptcp_bpf_burst.c     | 208 ++++++++++++++++++
 .../selftests/bpf/progs/mptcp_bpf_rr.c        |   5 +-
 .../selftests/bpf/progs/mptcp_bpf_stale.c     |  59 +++++
 10 files changed, 471 insertions(+), 47 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_burst.c
 create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_stale.c

-- 
2.35.3