[PATCH bpf-next 0/7] bpf: mptcp: Support for mptcp_sock and is_mptcp

Mat Martineau
2022-04-20T22:25:17Z

Hello BPF maintainers -

I'm one of the MPTCP subsystem maintainers. We have a MPTCP mailing list
and git repo, and have so far been upstreaming all of our commits
through the net-next and net trees. This is our first patch set for
bpf-next.

Our larger BPF-related project right now is implementing BPF-based
packet scheduling for MPTCP. One MPTCP connection may aggregate multiple
TCP "subflows", and the packet scheduler chooses which of those subflows
to use for each outgoing packet. So far we have been focusing on
BPF-based TCP congestion control code as a template.

This patch set adds BPF access to the is_mptcp flag in tcp_sock and
access to mptcp_sock structures, along with associated self tests. You
may recognize some of the code from earlier
(https://lore.kernel.org/bpf/20200918121046.190240-6-nicolas.rybowski@tessares.net/)
but it has been reworked quite a bit.

Our current plan for MPTCP-related BPF patches is to continue doing
initial review on the MPTCP mailing list, and then upstream those
changes through the mailing lists to the bpf-next or bpf trees as
appropriate. This has worked well for net-next and net so far, but if
you'd prefer to handle MPTCP/BPF changes differently we can discuss
alternatives of course!

Thanks,

Mat

Geliang Tang (5):
bpf: add bpf_skc_to_mptcp_sock_proto
selftests: bpf: test bpf_skc_to_mptcp_sock
selftests: bpf: verify token of struct mptcp_sock
selftests: bpf: verify ca_name of struct mptcp_sock
selftests: bpf: verify first of struct mptcp_sock

Nicolas Rybowski (2):
bpf: expose is_mptcp flag to bpf_tcp_sock
selftests: bpf: add MPTCP test base

MAINTAINERS | 2 +
include/linux/btf_ids.h | 3 +-
include/net/mptcp.h | 6 +
include/uapi/linux/bpf.h | 8 +
net/core/filter.c | 26 +-
net/mptcp/Makefile | 4 +
net/mptcp/bpf.c | 22 ++
scripts/bpf_doc.py | 2 +
tools/include/uapi/linux/bpf.h | 8 +
.../testing/selftests/bpf/bpf_mptcp_helpers.h | 17 ++
tools/testing/selftests/bpf/bpf_tcp_helpers.h | 4 +
tools/testing/selftests/bpf/config | 1 +
tools/testing/selftests/bpf/network_helpers.c | 43 ++-
tools/testing/selftests/bpf/network_helpers.h | 4 +
.../testing/selftests/bpf/prog_tests/mptcp.c | 258 ++++++++++++++++++
.../testing/selftests/bpf/progs/mptcp_sock.c | 76 ++++++
16 files changed, 474 insertions(+), 10 deletions(-)
create mode 100644 net/mptcp/bpf.c
create mode 100644 tools/testing/selftests/bpf/bpf_mptcp_helpers.h
create mode 100644 tools/testing/selftests/bpf/prog_tests/mptcp.c
create mode 100644 tools/testing/selftests/bpf/progs/mptcp_sock.c

base-commit: c7655df434de1dab1af1b1ba2aad757b15e25b83
--
2.36.0