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 more MPTCP endpoints in the selftests, in order to create more than 2 subflows.
- Patch 4: 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.
- Patch 5: a small fix to drop an unused parameter in the selftests.
Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- Changes in v3: - Previous patches 1, 2 and 5 were no longer needed. (Martin) - Patch 2: Switch to 'struct sock' and drop unneeded checks. (Martin) - Patch 4: Adapt the test accordingly. - Patch 5: New small fix for the selftests. - Examples and questions for BPF maintainers have been added in Patch 2. - Link to v2: https://lore.kernel.org/r/20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-0...
Changes in v2: - Patches 1-2: new ones. - Patch 3: remove two kfunc, more restrictions. (Martin) - Patch 4: add BUILD_BUG_ON(), more restrictions. (Martin) - Patch 7: adaptations due to modifications in patches 1-4. - Link to v1: https://lore.kernel.org/r/20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0...
--- Geliang Tang (5): bpf: Register mptcp common kfunc set bpf: Add mptcp_subflow bpf_iter selftests/bpf: More endpoints for endpoint_init selftests/bpf: Add mptcp_subflow bpf_iter subtest selftests/bpf: Drop cgroup_fd of run_mptcpify
net/mptcp/bpf.c | 87 +++++++++++++- tools/testing/selftests/bpf/bpf_experimental.h | 8 ++ tools/testing/selftests/bpf/prog_tests/mptcp.c | 133 +++++++++++++++++++-- tools/testing/selftests/bpf/progs/mptcp_bpf.h | 4 + .../testing/selftests/bpf/progs/mptcp_bpf_iters.c | 59 +++++++++ 5 files changed, 282 insertions(+), 9 deletions(-) --- base-commit: dad704ebe38642cd405e15b9c51263356391355c change-id: 20241108-bpf-next-net-mptcp-bpf_iter-subflows-027f6d87770e
Best regards,