v6:
 - Add redundant flag for struct mptcp_sched_ops.
 - add a dedicated function __mptcp_subflows_push_pending() to deal with
   redundat subflows push pending.

v5:
 - address to Paolo's comment, keep the optimization to
mptcp_subflow_get_send() for the non eBPF case.
 - merge mptcp_sched_get_send() and __mptcp_sched_get_send() in v4 into one.
 - depends on "cleanups for bpf sched selftests".

v4:
 - small cleanups in patch 1, 2.
 - add TODO in patch 3.
 - rebase patch 5 on 'cleanups for bpf sched selftests'.

v3:
 - use new API.
 - fix the link failure tests issue mentioned in ("https://patchwork.kernel.org/project/mptcp/cover/cover.1653033459.git.geliang.tang@suse.com/").

v2:
 - add MPTCP_SUBFLOWS_MAX limit to avoid infinite loops when the
   scheduler always sets call_again to true.
 - track the largest copied amount.
 - deal with __mptcp_subflow_push_pending() and the retransmit loop.
 - depends on "BPF round-robin scheduler" v14.

v1:

Implements the redundant BPF MPTCP scheduler, which sends all packets
redundantly on all available subflows.

Geliang Tang (9):
  Squash to "mptcp: add struct mptcp_sched_ops"
  Squash to "mptcp: add get_subflow wrappers"
  mptcp: redundant subflows push pending
  mptcp: add sched_get_retrans wrapper
  mptcp: redundant subflows retrans support
  Squash to "bpf: Add bpf_mptcp_sched_ops"
  Squash to "selftests/bpf: Add mptcp sched structs"
  selftests/bpf: Add bpf_red scheduler
  selftests/bpf: Add bpf_red test

 include/net/mptcp.h                           |   1 +
 net/mptcp/bpf.c                               |   3 +
 net/mptcp/protocol.c                          | 122 ++++++++++++++----
 net/mptcp/protocol.h                          |   4 +-
 net/mptcp/sched.c                             |  62 +++++----
 net/mptcp/subflow.c                           |   1 -
 tools/testing/selftests/bpf/bpf_tcp_helpers.h |   1 +
 .../testing/selftests/bpf/prog_tests/mptcp.c  |  34 +++++
 .../selftests/bpf/progs/mptcp_bpf_red.c       |  37 ++++++
 9 files changed, 215 insertions(+), 50 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_red.c

-- 
2.35.3