[PATCH mptcp-next v13 0/3] BPF round-robin scheduler

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

v13:
 - add !msk->last_snd check in patch 2
 - use ASSERT_OK_PTR instead of CHECK in patch 3
 - base-commit: export/20220509T115202

v12:
 - init ssk from data->contexts[0], instead of msk->first.
 - cycle through all the subflows, instead of the first two.

v11:
 - rename array to contexts.
 - drop number of subflows in mptcp_sched_data.
 - set unused array elements to NULL.
 - add MPTCP_SUBFLOWS_MAX check in mptcp_sched_data_init.

v10:
 - init subflows array in mptcp_sched_data_init.
 - for (int i = 0; i < data->subflows; i++) is not allowed in BPF, using
   this instead:
	for (int i = 0; i < MPTCP_SUBFLOWS_MAX && i < data->subflows; i++)
 - deponds on: "BPF packet scheduler" series v18.

v9:
 - add subflows array in mptcp_sched_data
 - deponds on: "BPF packet scheduler" series v17 +
               Squash to "mptcp: add struct mptcp_sched_ops v17".

v8:
 - use struct mptcp_sched_data.
 - deponds on: "BPF packet scheduler" series v14.

v7:
 - rename retrans to reinject.
 - drop last_snd setting.
 - deponds on: "BPF packet scheduler" series v13.

v6:
 - set call_me_again flag.
 - deponds on: "BPF packet scheduler" series v12.

v5:
 - update patch 2, use temporary storage instead.
 - update patch 3, use new helpers.
 - deponds on: "BPF packet scheduler" series v11.

v4:
 - add retrans argment for get_subflow()

v3:
 - add last_snd write access.
 - keep msk->last_snd setting in get_subflow().
 - deponds on: "BPF packet scheduler" series v10.

v2:
 - merge the squash-to patch.
 - implement bpf_mptcp_get_subflows helper, instead of
   bpf_mptcp_get_next_subflow.
 - deponds on: "BPF packet scheduler v9".

This patchset implements round-robin scheduler using BPF. Address to
some commends for the RFC version:

https://patchwork.kernel.org/project/mptcp/cover/cover.1631011068.git.geliangtang@xiaomi.com/

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/75

Geliang Tang (3):
  mptcp: add subflows array in sched data
  selftests/bpf: add bpf_rr scheduler
  selftests/bpf: add bpf_rr test

 include/net/mptcp.h                           |  2 +
 net/mptcp/sched.c                             | 14 ++++++
 .../testing/selftests/bpf/bpf_mptcp_helpers.h |  8 ++++
 .../testing/selftests/bpf/prog_tests/mptcp.c  | 38 +++++++++++++++
 .../selftests/bpf/progs/mptcp_bpf_rr.c        | 47 +++++++++++++++++++
 5 files changed, 109 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_rr.c

-- 
2.34.1