[bpf-next/net,0/5] bpf: Add mptcp_subflow bpf_iter support

Message

Matthieu Baerts (NGI0) Nov. 8, 2024, 3:52 p.m. UTC

Here is a series from Geliang, adding mptcp_subflow bpf_iter support.

We are working on extending MPTCP with BPF, e.g. to control the path
manager -- in charge of the creation, deletion, and announcements of
subflows (paths) -- and the packet scheduler -- in charge of selecting
which available path the next data will be sent to. These extensions
need to iterate over the list of subflows attached to an MPTCP
connection, and do some specific actions via some new kfunc that will be
added later on.

This preparation work is split in different patches:

- Patch 1: register some "basic" MPTCP kfunc.

- Patch 2: add mptcp_subflow bpf_iter support. Note that previous
           versions of this single patch have already been shared to the
           BPF mailing list. The changelog has been kept with a comment,
           but the version number has been reset to avoid confusions.

- Patch 3: add kfunc to make sure the msk is valid

- Patch 4: add more MPTCP endpoints in the selftests, in order to create
           more than 2 subflows.

- Patch 5: add a very simple test validating mptcp_subflow bpf_iter
           support. This test could be written without the new bpf_iter,
           but it is there only to make sure this specific feature works
           as expected.

Signed-off-by: Matthieu Baerts (NGI0) <[e-mail]>
---
Geliang Tang (5):
      bpf: Register mptcp common kfunc set
      bpf: Add mptcp_subflow bpf_iter
      bpf: Acquire and release mptcp socket
      selftests/bpf: More endpoints for endpoint_init
      selftests/bpf: Add mptcp_subflow bpf_iter subtest

 net/mptcp/bpf.c                                    | 104 ++++++++++++++++-
 tools/testing/selftests/bpf/bpf_experimental.h     |   8 ++
 tools/testing/selftests/bpf/prog_tests/mptcp.c     | 129 ++++++++++++++++++++-
 tools/testing/selftests/bpf/progs/mptcp_bpf.h      |  10 ++
 .../testing/selftests/bpf/progs/mptcp_bpf_iters.c  |  64 ++++++++++
 5 files changed, 308 insertions(+), 7 deletions(-)
---
base-commit: 141b4d6a8049cecdc8124f87e044b83a9e80730d
change-id: 20241108-bpf-next-net-mptcp-bpf_iter-subflows-027f6d87770e

Best regards,