This set allows the bpf-tcp-cc to call bpf_setsockopt.  One use
case is to allow a bpf-tcp-cc switching to another cc during init().
For example, when the tcp flow is not ecn ready, the bpf_dctcp
can switch to another cc by calling setsockopt(TCP_CONGESTION).

bpf_getsockopt() is also added to have a symmetrical API, so
less usage surprise.

Martin KaFai Lau (4):
  bpf: tcp: Allow bpf-tcp-cc to call bpf_(get|set)sockopt
  bpf: selftests: Add sk_state to bpf_tcp_helpers.h
  bpf: selftests: Add connect_to_fd_opts to network_helpers
  bpf: selftests: Add dctcp fallback test

 kernel/bpf/bpf_struct_ops.c                   |  22 +++-
 net/ipv4/bpf_tcp_ca.c                         |  26 ++++-
 tools/testing/selftests/bpf/bpf_tcp_helpers.h |   5 +
 tools/testing/selftests/bpf/network_helpers.c |  23 +++-
 tools/testing/selftests/bpf/network_helpers.h |   6 ++
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 101 ++++++++++++++----
 .../selftests/bpf/prog_tests/kfunc_call.c     |   2 +-
 tools/testing/selftests/bpf/progs/bpf_dctcp.c |  20 ++++
 .../selftests/bpf/progs/bpf_dctcp_release.c   |  26 +++++
 .../bpf/progs/kfunc_call_test_subprog.c       |   4 +-
 10 files changed, 203 insertions(+), 32 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_dctcp_release.c

-- 
2.30.2