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smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PhlfcmQj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PhlfcmQj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4131DC4CEF1 for ; Wed, 12 Nov 2025 17:58:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762970300; bh=gTnj6MwddkjhF1bwpkyHQL/TBGvNAuqCo/P2BsqgzxY=; h=Date:From:To:Subject:From; b=PhlfcmQjIF9r3bcqHZ9fko3KTlohWj6/Ca43wwNRTX8ZTBT9SmGIjzTyGO6MnLOp8 8CXK24i2SZu7DRpJx9OOpoXebl97tNfAT9nN37k4LU4l96Nc3YbogJd7kFMbMDM42t Fub2RVw9TKDJ4zxrKZAZ6aEsOx0Eq9nxp7jCYNihz9QmNMIRnCwV7ubzUqFhb+Y058 Me4PqzTz28/oy7uRonTuohygIWPj2piRxGcSVsXFR5bYnSCXIo900zFOrEwc8o/dS/ eMl39XfMaqGktTV4lNjS91mkM14MpdBbsHAcoomV2G+VwvWTSeOK1g6KiRs1bTpgLT cFfr/FtQZ1OQw== Message-ID: <5e7430ff-ef27-49ef-a295-875a8c6fdcd1@kernel.org> Date: Wed, 12 Nov 2025 18:58:18 +0100 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta From: Matthieu Baerts Content-Language: en-GB, fr-BE To: MPTCP Linux Subject: [Weekly meetings] MoM - 5th of November 2025 Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit Hello everyone, Last week, we had our new meeting with Mat (Cruise), Paolo (Redhat) and myself (NGI0 Core). Thanks again for this new good meeting! Here are the minutes of the meeting: Accepted patches: - The list of accepted patches can be seen on PatchWork: https://patchwork.kernel.org/project/mptcp/list/?state=3 netdev (if mptcp ML is in cc) (by: Matthieu Baerts): 14287659: [net,1/4] mptcp: drop bogus optimization in __mptcp_check_push() 14287660: [net,2/4] mptcp: fix MSG_PEEK stream corruption 14287661: [net,3/4] mptcp: restore window probe 14287662: [net,4/4] mptcp: zero window probe mib: - Series: mptcp: various rare sending issues - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1016623&state=*&archive=both 14287911: [net,v3,1/4] mptcp: fix subflow rcvbuf adjust 14287912: [net,v3,2/4] trace: tcp: add three metrics to trace_tcp_rcvbuf_grow() 14287913: [net,v3,3/4] tcp: add newval parameter to tcp_rcvbuf_grow() 14287914: [net,v3,4/4] tcp: fix too slow tcp_rcvbuf_grow() action: - Series: tcp: fix receive autotune again - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1016697&state=*&archive=both 14295026: [net-next,1/4] mptcp: pm: in-kernel: record fullmesh endp nb 14295027: [net-next,2/4] mptcp: pm: in kernel: only use fullmesh endp if any 14295028: [net-next,3/4] selftests: mptcp: join: do_transfer: reduce code dup 14295029: [net-next,4/4] selftests: mptcp: join: validate extra bind cases: - Series: mptcp: pm: in-kernel: fullmesh endp nb + bind cases - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1018552&state=*&archive=both our repo (by: GangYan, Matthieu Baerts, Paolo Abeni): 14278733: [v2,mptcp-net,1/2] mptcp: restore window probe 14278734: [v2,mptcp-net,2/2] mptcp: zero window probe mib: - Series: mptcp: restore zero window probe - Submitter: Paolo Abeni - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1014382&state=*&archive=both 14279404: [v6,mptcp-next,01/11] mptcp: drop bogus optimization in __mptcp_check_push() 14279409: [v6,mptcp-next,03/11] mptcp: cleanup fallback data fin reception 14279407: [v6,mptcp-next,04/11] mptcp: cleanup fallback dummy mapping generation 14279406: [v6,mptcp-next,05/11] mptcp: fix MSG_PEEK stream corruption 14279408: [v6,mptcp-next,06/11] mptcp: ensure the kernel PM does not take action too late 14279411: [v6,mptcp-next,07/11] mptcp: do not miss early first subflow close event notification. 14279410: [v6,mptcp-next,08/11] mptcp: make mptcp_destroy_common() static 14279412: [v6,mptcp-next,09/11] mptcp: drop the __mptcp_data_ready() helper 14283178: [mptcp-next] Squash to "selftests: mptcp: join: validate extra bind cases": - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/patch/20251024-sft-fix-bind-timeout-v1-1-cb81a67b222c@kernel.org/ 14295242: [mptcp-net,v2,1/6] selftests: mptcp: connect: fix fallback note due to OoO 14295243: [mptcp-net,v2,2/6] selftests: mptcp: join: rm: set backup flag 14295244: [mptcp-net,v2,3/6] selftests: mptcp: join: endpoints: longer transfer 14295245: [mptcp-net,v2,4/6] selftests: mptcp: join: userspace: longer transfer 14295246: [mptcp-net,v2,5/6] selftests: mptcp: join: fastclose: drop plain RST 14295247: [mptcp-net,v2,6/6] selftests: mptcp: connect: trunc: read all recv data: - Series: selftests: mptcp: join: fix flaky tests - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1018612&state=*&archive=both 14297102: [mptcp-next,1/5] selftests: mptcp: lib: introduce 'nstat_{init,get}' 14297103: [mptcp-next,2/5] selftests: mptcp: lib: remove stats files args 14297104: [mptcp-next,3/5] selftests: mptcp: lib: stats: remove nstat rate columns 14297105: [mptcp-next,4/5] selftests: mptcp: join: dump stats from history 14297106: [mptcp-next,5/5] selftests: mptcp: lib: get counters from nstat history: - Series: selftests: mptcp: get counters from nstat history - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019082&state=*&archive=both 14298228: [mptcp-net] mptcp: fix address removal logic in mptcp_pm_nl_rm_addr: - Submitter: GangYan - URL: https://patchwork.kernel.org/project/mptcp/patch/20251104123416.395362-1-gang.yan@linux.dev/ 14298615: [mptcp-next,v8,1/4] mptcp: handle first subflow closing consistently 14298614: [mptcp-next,v8,2/4] mptcp: borrow forward memory from subflow 14298616: [mptcp-next,v8,3/4] mptcp: introduce mptcp-level backlog 14298617: [mptcp-next,v8,4/4] mptcp: leverage the backlog for RX packet processing: - Series: mptcp: introduce backlog processing - Submitter: Paolo Abeni - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019535&state=*&archive=both Pending patches: - The list of pending patches can be seen on PatchWork: https://patchwork.kernel.org/project/mptcp/list/?state=* netdev (if mptcp ML is in cc) (by: Jiayuan Chen): 14299873: [net,v4,1/3] mptcp: disallow MPTCP subflows from sockmap 14299851: [net,v4,2/3] net,mptcp: fix proto fallback detection with BPF 14299874: [net,v4,3/3] selftests/bpf: Add mptcp test with sockmap: - Series: mptcp: Fix conflicts between MPTCP and sockmap - Submitter: Jiayuan Chen - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019848&state=*&archive=both 14296835: [6.12.y-5.10.y] selftests: mptcp: connect modes: re-add exec mode: - State: New - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/patch/20251103165433.6396-2-matttbe@kernel.org/ - cannot be applied because they use Quilt 14298196: [6.12.y] mptcp: fix MSG_PEEK stream corruption: - State: New - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/patch/20251104121515.1093006-2-matttbe@kernel.org/ our repo (by: Christoph Paasch, Gang Yan, Geliang Tang, Gregory Detal, Matthieu Baerts, Paolo Abeni): 12282223: [RESEND,RFC,mptpcp-next] mptcp: add ooo prune support: 13070467: [mptcp-next,v4,1/2] mptcp: update mptcp_push_release 13070468: [mptcp-next,v4,2/2] mptcp: retrans for redundant sends: - State: Changes requested - Series: BPF redundant scheduler, part 3 - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=703615&state=*&archive=both - status: same as last time 13305089: [mptcp-next,1/6] mptcp: sockopt: move tcp_inq code to a dedicated function 13305091: [mptcp-next,2/6] mptcp: sockopt: update supported list 13305093: [mptcp-next,3/6] mptcp: sockopt: get val in a generic way 13305090: [mptcp-next,4/6] mptcp: sockopt: add missing getsockopt() options 13305094: [mptcp-next,5/6] mptcp: sockopt: set val in a generic way 13305092: [mptcp-next,6/6] mptcp: sockopt: support IP_TTL & IPV6_UNICAST_HOPS: - State: Changes requested - Series: mptcp: sockopt: uniform code to get/set values - Submitter: Matthieu Baerts - URL: https://patchwork.kernel.org/project/mptcp/list/?series=763505&state=*&archive=both - status: same as last time 13583230: [RFC] mptcp: react scheduler when subflow events pop up: - State: Changes requested - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/patch/433320c3a9db77bea53a34fc9c43a3c7e3320399.1709693691.git.tanggeliang@kylinos.cn/ - status: same as last time 13675217: [mptcp-next,RFC,1/4] mptcp: add push sched callback 13675218: [mptcp-next,RFC,2/4] mptcp: use new push callback to schedule chunks 13675219: [mptcp-next,RFC,3/4] mptcp: bpf: allow to write to mptcp_sched_chunk 13675220: [mptcp-next,RFC,4/4] selftests/bpf: mptcp RR: send 1 MSS on each subflow: - State: RFC - Series: mptcp: update scheduler API - Submitter: Gregory Detal - URL: https://patchwork.kernel.org/project/mptcp/list/?series=856158&state=*&archive=both - status: same as last time 13932555: [1/3] mptcp: fix invalid addr occupy 'add_addr_accepted' 13932556: [2/3] selftests: mptcp: relax conditions in SYN_TX validation 13932546: [3/3] selftests: mptcp: add a testcase for invalid addr timeout: - State: Changes requested - Series: [1/3] mptcp: fix invalid addr occupy 'add_addr_accepted' - Submitter: Gang Yan - URL: https://patchwork.kernel.org/project/mptcp/list/?series=923771&state=*&archive=both - status: same as last time 14024767: [mptcp-next,v1,1/4] bpf: Add mptcp path manager struct_ops 14024768: [mptcp-next,v1,2/4] bpf: Export mptcp path manager kfuncs 14024769: [mptcp-next,v1,3/4] selftests/bpf: Add mptcp netlink pm subtest 14024770: [mptcp-next,v1,4/4] selftests/bpf: Add mptcp bpf_netlink pm subtest: - State: Changes requested - Series: BPF path manager, part 7 - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=946095&state=*&archive=both - status: same as last time 14053397: [mptcp-next,v3,1/3] mptcp: pm: userspace: drop delete_local_addr helper 14053398: [mptcp-next,v3,2/3] selftests: mptcp: join: update userspace dump_addr outputs 14053399: [mptcp-next,v3,3/3] selftests: mptcp: userspace: send RM_ADDR between server and client: - State: Under review - Series: only remove entry from local_addr_list when sending a REMOVE_ADDR - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=953862&state=*&archive=both - status: same as last time 14102233: [mptcp-next,v3,1/3] selftests/bpf: Add sndbuf for send_recv_data 14102235: [mptcp-next,v3,2/3] Squash to "selftests/bpf: Add bpf scheduler test" 14102234: [mptcp-next,v3,3/3] DO-NOT-MERGE: selftests/bpf: Increase total_bytes of bpf sched tests: - State: Changes requested - Series: send() fails with EAGAIN in blocking IO mode "487 - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=967210&state=*&archive=both - status: same as last time 14167004: [mptcp-next] mptcp: remove redundant orig_offset in carve_data_frag: - State: Changes requested - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/patch/9c663fc37767d9036379afdbc83cd8874a7b2fc9.1753337130.git.tanggeliang@kylinos.cn/ - status: same as last time 14175678: [mptcp-next,1/2] mptcp: Add support for SO_MAX_PACING_RATE 14175679: [mptcp-next,2/2] selftests: Add tests for SO_MAX_PACING_RATE: - State: Changes requested - Series: mptcp: Add support for SO_MAX_PACING_RATE - Submitter: Christoph Paasch - URL: https://patchwork.kernel.org/project/mptcp/list/?series=987909&state=*&archive=both - status: same as last time 14185125: [mptcp-next,1/6] mptcp: add helper for setsockopt on first subflow only 14185126: [mptcp-next,2/6] mptcp: handle SOL_SOCKET options on first subflow only 14185128: [mptcp-next,3/6] mptcp: refactor IP socket option handling for first subflow 14185127: [mptcp-next,4/6] mptcp: extract IPv6 socket option handling for first subflow 14185129: [mptcp-next,5/6] mptcp: handle SOL_TCP options on all subflows 14185130: [mptcp-next,6/6] mptcp: handle IP socket options on all subflows: - State: Needs ack - Series: refactor MPTCP socket option handling - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=990414&state=*&archive=both - status: same as last time 14185142: [mptcp-next,v2,1/3] mptcp: add IPV6_TCLASS socket option support 14185143: [mptcp-next,v2,2/3] mptcp: add IP_TTL socket option support 14185144: [mptcp-next,v2,3/3] mptcp: add IPV6_UNICAST_HOPS socket option support: - State: Needs ack - Series: mptcp: add more sockopts - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=990418&state=*&archive=both - status: same as last time 14197780: [mptcp-next,v2,01/10] selftests: mptcp: sockopt: improve test output clarity 14197781: [mptcp-next,v2,02/10] selftests: mptcp: sockopt: add SO_REUSEADDR test helper 14197782: [mptcp-next,v2,03/10] selftests: mptcp: sockopt: add SO_REUSEPORT test 14197783: [mptcp-next,v2,04/10] selftests: mptcp: sockopt: add SO_BINDTODEVICE test 14197784: [mptcp-next,v2,05/10] selftests: mptcp: sockopt: add SO_BINDTOIFINDEX test 14197785: [mptcp-next,v2,06/10] selftests: mptcp: sockopt: add IP_FREEBIND tests 14197786: [mptcp-next,v2,07/10] selftests: mptcp: sockopt: add IP_TRANSPARENT tests 14197787: [mptcp-next,v2,08/10] selftests: mptcp: sockopt: add IP_BIND_ADDRESS_NO_PORT test 14197788: [mptcp-next,v2,09/10] selftests: mptcp: sockopt: add IP_LOCAL_PORT_RANGE test 14197789: [mptcp-next,v2,10/10] selftests: mptcp: sockopt: add IPV6_V6ONLY test: - State: Changes requested - Series: selftests: cover more MPTCP socket options - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=993905&state=*&archive=both - status: same as last time 14215849: [mptcp-net,v2,1/3] selftests: mptcp: close server file descriptor 14215850: [mptcp-net,v2,2/3] selftests: mptcp: close IPC descriptor on server side 14229120: [mptcp-next,v4,1/9] selftests: mptcp: sockopt: replace /dev/urandom with getrandom 14229121: [mptcp-next,v4,2/9] selftests: mptcp: sockopt: add protocol arguments 14229122: [mptcp-next,v4,3/9] selftests: mptcp: sockopt: add inq argument 14229123: [mptcp-next,v4,4/9] selftests: mptcp: sockopt: rename pipefd to ipcfd 14229124: [mptcp-next,v4,5/9] selftests: mptcp: sockopt: set TCP_INQ sockopt 14229125: [mptcp-next,v4,6/9] selftests: mptcp: sockopt: handle INQ on server side 14229126: [mptcp-next,v4,7/9] selftests: mptcp: sockopt: handle INQ on client side 14229127: [mptcp-next,v4,8/9] selftests: mptcp: sockopt: replace mptcp_inq with sockopt 14229128: [mptcp-next,v4,9/9] selftests: mptcp: sockopt: remove obsolete mptcp_inq: - State: Changes requested - Series: selftests: consolidate TCP_INQ testing into sockopt - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1001827&state=*&archive=both - status: same as last time 14280548: [mptcp-next,v13,1/8] mptcp: add eat_recv_skb helper 14280549: [mptcp-next,v13,2/8] mptcp: implement .read_sock 14280550: [mptcp-next,v13,3/8] tcp: add recv_should_stop helper 14280551: [mptcp-next,v13,4/8] mptcp: use recv_should_stop helper 14280552: [mptcp-next,v13,5/8] tcp: export tcp_splice_state 14280553: [mptcp-next,v13,6/8] mptcp: implement .splice_read 14280554: [mptcp-next,v13,7/8] selftests: mptcp: add splice io mode 14280555: [mptcp-next,v13,8/8] selftests: mptcp: connect: cover splice mode: - State: New - Series: implement mptcp read_sock - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1014823&state=*&archive=both - Mat will have a look at it 14299105: [v2,mptcp-next,1/7] trace: mptcp: add mptcp_rcvbuf_grow tracepoint 14299106: [v2,mptcp-next,2/7] mptcp: avoid unneeded subflow-level drops. 14299107: [v2,mptcp-next,3/7] mptcp: fix receive space timestamp initialization. 14299108: [v2,mptcp-next,4/7] mptcp: consolidate rcv space init 14299109: [v2,mptcp-next,5/7] mptcp: better rcv space initialization 14299110: [v2,mptcp-next,6/7] mptcp: better mptcp-level rtt estimator 14299111: [v2,mptcp-next,7/7] mptcp: add receive queue awareness in tcp_rcv_space_adjust(): - State: New - Series: mptcp: autotune related improvement - Submitter: Paolo Abeni - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019624&state=*&archive=both 14299674: [mptcp-next,v6,1/7] tcp: md5: remove redundant l3flag variable 14299675: [mptcp-next,v6,2/7] mptcp: handle TCP_MAXSEG getsockopt in common case 14299676: [mptcp-next,v6,3/7] mptcp: setsockopt support for TCP_MD5SIG 14299677: [mptcp-next,v6,4/7] selftests: mptcp: sockopt: add md5 argument 14299678: [mptcp-next,v6,5/7] selftests: mptcp: sockopt: implement TCP_MD5SIG support 14299679: [mptcp-next,v6,6/7] selftests: mptcp: sockopt: skip getsockopt for MD5 tests 14299680: [mptcp-next,v6,7/7] selftests: mptcp: sockopt: add TCP_MD5SIG test cases: - State: New - Series: mptcp: TCP_MD5SIG support - Submitter: Geliang Tang - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019796&state=*&archive=both - Matth: will check that 14300058: [mptcp-net,1/2] mptcp: decouple mptcp fastclose from tcp close 14300059: [mptcp-net,2/2] mptcp: fix duplicate reset on fastclose: - State: New - Series: [mptcp-net,1/2] mptcp: decouple mptcp fastclose from tcp close - Submitter: Paolo Abeni - URL: https://patchwork.kernel.org/project/mptcp/list/?series=1019919&state=*&archive=both Issues on GitHub: https://github.com/multipath-tcp/mptcp_net-next/issues/ Recently opened (latest from the last meeting: 593): 596 selftests: `mptcp_join`: fastclose also generate "plain" RST [bug] [selftests] @pabeni: - See patches above 595 selftests: `mptcp_connect`: MPTCP -> MPTCP timeout during closing time [bug] [selftests]: - tried to reproduce the issue but no luck so far. - It is possible multiple data fin can be sent with different sequences: in this case, we might ignore the following data_fin - Matth: TODO: check previous packet traces when that might have happened → done 594 selftests: `mptcp_connect`: MPTCP -> TCP timeout during closing time [bug] [selftests]: - tried to reproduce with a packetdrill test - maybe try with no delay: it will depend on when the worker processes the FIN - and also read the last bytes carried in the FIN - and also injecting more data without reading them - TODO Matth: check ↑ → done Recently discussed 592 Lower throughput with MPTCP vs TCP [bug]: - HW GRO seems to be the culprit: it would be good to start discussing with NICs vendors (NVidia, Intel, etc.). It **might** be easy to add some exceptions for MPTCP in some NIC firmwares. Who has contact and/or could help to find the right people to talk to? - Strange TCP is not even higher, maybe because the limitation for TCP was the IO? (check with 'iperf3 -Z' and/or iotop) If yes, maybe we can never do better than TCP connections in this case. Or then the test case is maybe not realistic: it might be different with many applications and all sort of data to different hosts? Or maybe only the resilience is important here, and doing as good as TCP is fine? - It would be interesting to do the same validations on top of Paolo's pending series (EDIT: one left as of today, the rest is in our `export` branch), because there are new optimisations, especially when the latency is very short like what you would have on the same host or in a DC. 591 in-kernel PM: not established paths when used with IPv6 link-local addresses [bug]: - Can be closed? - TODO Matth → Done 588 in-kernel PM: support NUMA awareness [enhancement] [feedback-needed]: - Maybe BPF PM is the solution 549 pm: in-kernel: set `msk->pm.work_pending` back to `true` [bug] [selftests] [pm]: - New comment from Gang: to be checked Bugs (opened, flagged as "bug" and assigned) 596 selftests: `mptcp_join`: fastclose also generate "plain" RST [bug] [selftests] @pabeni 575 sockopt: support `TCP_MD5SIG` and `TCP_MD5SIG_EXT` for transparent integrations [bug] @geliangtang 498 in-kernel PM: closed subflows before `RM_ADDR` will not decrement `add_addr_accepted` [bug] [pm] @geliangtang 484 BPF: `setsockopt` on an MPTCP socket: check support [bug] [bpf] @geliangtang 445 MPTCP Info counters: start seq numbers ones from 0 [bug] @geliangtang 403 userspace pm: only remove entry from `local_addr_list` when sending a `REMOVE_ADDR` [bug] [pm] @geliangtang 343 scheduler: react when subflow-level events pop up (ACK/RTO) [bug] [sched] @geliangtang Bugs (opened and flagged as "bug" and not assigned) 595 selftests: `mptcp_connect`: MPTCP -> MPTCP timeout during closing time [bug] [selftests] 594 selftests: `mptcp_connect`: MPTCP -> TCP timeout during closing time [bug] [selftests] 592 Lower throughput with MPTCP vs TCP [bug] 591 in-kernel PM: not established paths when used with IPv6 link-local addresses [bug] 587 in-kernel PM: Server is only using single IP to establish subflows [bug] 586 [syzkaller] WARNING in `subflow_data_ready` [bug] [syzkaller] 583 KMemLeak: from `mptcp_sk_clone_init()` [bug] [selftests] 581 Default scheduler under-utilizes newly restored subflows on long-lived flows after WAN failback [bug] 574 [selftests] `mptcp_connect.sh`: `copyfd_io_poll`: poll timed out [bug] [selftests] 572 [syzkaller] WARNING in `skb_try_coalesce` [bug] [syzkaller] 567 [syzbot] WARNING in `__mark_subflow_endp_available` [bug] [syzkaller] [reproducer] 561 [syzkaller] WARNING in `mptcp_pm_alloc_anno_list` [bug] [syzkaller] 549 pm: in-kernel: set `msk->pm.work_pending` back to `true` [bug] [selftests] [pm] 508 Divide error on device removal [bug] [feedback-needed] 505 Subflows won't be used when the interface for the main flow is a subinterface [bug] [feedback-needed] 495 [syzkaller] KASAN: slab-use-after-free Read in `__inet6_lookup_established` [bug] [syzkaller] 494 [syzkaller] WARNING in `__skb_flow_dissect` [bug] [syzkaller] 492 userspace pm: subflows counter: not updated when a subflows is removed from the other end [bug] 491 selftests: `mptcp_join`: tests `Infinite map` & `MP_FAIL MP_RST` are unstable [bug] [selftests] 483 [6.1] selftests: `mptcp_connect.sh` failures with `copyfd_io_poll: poll timed out` errors [bug] [selftests] 476 packetdrill: coalescing feature doesn't take into account MPTCP options [bug] [packetdrill] 475 `simult_flows`: unbalanced bwidth tests are unstable [bug] [selftests] 439 mptcp vs net.ipv4.tcp_shrink_window [bug] 336 Issues with BPF packet scheduler [bug] [sched] [bpf] 325 selftests: `mptcp_join`: test 18 `signal addresses race test` is sometimes failing [bug] [selftests] 324 selftests: `mptcp_join`: tests `fastclose test` & `fastclose server test` are sometimes failing [bug] [selftests] 315 Issues with backup flow [bug] In Progress (opened, new feature and assigned) 568 socket option: support `IPV6_TCLASS` [enhancement] @geliangtang 480 MPTCP and KTLS support [enhancement] @geliangtang 434 in-kernel PM: increase subflows limit [enhancement] [pm] @matttbe 353 sockopt: uniform code to get/set values [enhancement] @matttbe 349 scheduler: (un)mark a subflow as "stale" [enhancement] [sched] @geliangtang 296 Support IP_TTL & IPV6_UNICAST_HOPS [enhancement] @matttbe 167 packetdrill: add coverage for RM_ADDR [enhancement] [packetdrill] @dcaratti 75 BPF: packet scheduler [enhancement] [sched] [bpf] @geliangtang 74 BPF: path manager [enhancement] [pm] [bpf] @geliangtang Assigned Questions (opened, questions and assigned) 548 disable mptcp for an interface [question] @matttbe Open questions (opened, questions and not assigned) 562 [performance] How much is the overhead of MPTCP？ [question] 530 about mptcp subflow creation question [question] [feedback-needed] 520 Question about proper MPTCP configuration over VPN. [question] [feedback-needed] 412 shadowsocks-libev not working, need guidance for PM configuration [question] [feedback-needed] For later (opened and not assigned) 590 in-kernel PM: use either `subflow` or `signal` depending on connector/listener app [enhancement] 588 in-kernel PM: support NUMA awareness [enhancement] [feedback-needed] 584 [syzkaller] improve coverage [syzkaller] 578 sockopt: support `SO_MAX_PACING_RATE` to limit the whole MPTCP connection [enhancement] 566 pm: use `signal` + `subflow` + `fullmesh` [enhancement] [pm] 556 Implement all required bits to C/R MPTCP connections from user-space (CRIU) [enhancement] 552 pm: in-kernel: delay before creating new subflows [enhancement] 545 Deal with multiple pure TCP ACK without MPTCP options [enhancement] 543 TCPDump: display `MP_TCPRST` info [enhancement] 542 in-kernel PM: limit to one subflow per network interface for each connection [enhancement] [pm] 535 TCPDump: display `MP_CAPABLE` C flag [enhancement] 525 tests: cover more MPTCP socket options [enhancement] [packetdrill] [selftests] 521 Implement psock_update_sk_prot, for eBPF SOCKMAP support [enhancement] 519 Reset the connection once "MPTCP has been verified" instead of a fallback [enhancement] 511 Add MIB counters for sent `MPTCP_RST_EMPTCP` [enhancement] 497 in-kernel PM: check to create new subflows when some are destroyed [enhancement] [pm] 496 in-kernel PM: store received `ADD_ADDR` [enhancement] [pm] 481 remove refcount on TCP sockets for the timers [enhancement] 467 Scheduler: add redundant scheduler support in BPF [enhancement] [sched] 462 selftests: print (and set?) random seed [enhancement] [selftests] 461 Protocol: extend Data-Level Length field [enhancement] [protocol] 448 Allow sending ADD_ADDR IPv6 with port-number if TCP-timestamps are enabled [enhancement] 441 optimize established options generation [enhancement] 440 in-kernel PM: re-establish subflows after "network" errors [enhancement] [pm] 426 selftests: validate listener sockets with multiple accepts [enhancement] [selftests] 396 ci: periodically run selftests from the export branch on stable kernels [enhancement] [selftests] 389 packetdrill: increase coverage for "early `close()`" cases [enhancement] [packetdrill] 350 scheduler: API changes (tasks) [enhancement] [sched] 348 scheduler: frequently probe "stale" subflow with reinjected data [enhancement] [sched] 345 scheduler: "penalise" some subflows by sending less than their cwnd [enhancement] [sched] 344 scheduler: new callback to initiate optimisations [enhancement] [sched] 337 in-kernel PM: listen socket: support "behind a NAT" use case [enhancement] [pm] 335 Server to Client subflows: option to allow joining the initial address and port [enhancement] [pm] 334 in-kernel PM: send >1 ADD_ADDR before the establishment of a new subflow [enhancement] [pm] 332 scheduler: implement a "opportunistic retransmission" [enhancement] [sched] 298 CG Memory accounting for passive MPTCP socket [enhancement] 289 mptcp: audit comments for non inclusive language [enhancement] 273 Packetdrill: test outgoing MP_FASTCLOSE [enhancement] [packetdrill] 266 Packetdrill: add MP_FAIL coverage [packetdrill] 236 Review supported sockopts list [enhancement] 234 Packetdrill: Support MPC+DATA+checksum error [enhancement] [packetdrill] 222 Netlink event API: add SUBFLOW_CREATED event [enhancement] 215 TCP Urgent pointer and MPTCP [enhancement] 213 add MPTCP man page [enhancement] 208 better handing of ssk memory pressure in the TX path [enhancement] 202 Add sendmsg support for ancillary data [enhancement] 197 more mibs needed [enhancement] 180 Get an update when MPTCP fall back to TCP [enhancement] 177 improve retransmit subflow selection [enhancement] 169 packetdrill: add coverage for ADD_ADDR and MP_JOIN on a different port [enhancement] [packetdrill] 150 remove completely workqueue usage [enhancement] 141 avoid acquiring mptcp_data_lock() twice in the receive path [enhancement] 78 notify the application (userspace) when a subflow is added/removed [enhancement] Recently closed (since 2025-10-22) 593 New MPTCP connections won't be created if there's no connectivity on primary subflow [question]: - Could be possible to handle that on MPTCP side, but it doesn't seem easy, and it might break expectations from userspace. Better to handle that with routes. 589 selftests: `simult_flows`: "unbalanced bwidth with opposed, unbalanced delay" is unstable [bug] [selftests] @geliangtang Packetdrill PRs 181 22 hours ago matttbe mptcp: new DATA_FIN retrans tests: - New test, passing, can be merged if reviews are OK 180 12 days ago matttbe mptcp: unskip TCP_NOTSENT_LOWAT test: - Seems passing now, can be merged if reviews are OK 162 4 months ago geliangtang mptcp: add splice test: - TODO: Matth: check with Geliang if he plans to update it → Done 52 9 months ago dcaratti Add initial coverage for RM_ADDR mptcp.dev PRs / mptcpd PRs 327 21 days ago matttbe man: plugin-dir: not world writable 326 1 hour ago matttbe flags: add 'laminar' endpoints support 323 27 days ago matttbe interface: add `deny_join_id0` parameter FYI: Current Roadmap: - Bugs: https://github.com/multipath-tcp/mptcp_net-next/issues?q=is%3Aissue+is%3Aopen+label%3Abug - Current/Coming merge window (6.19): https://github.com/orgs/multipath-tcp/projects/17 - For later: https://github.com/orgs/multipath-tcp/projects/1 Patches to send to NetDev: - Fixes for other trees: - [f35023f92ed5] selftests: bpf: fix recent compilation errors (Matthieu Baerts (NGI0)) - [a7cb48db2368] gcov: add support for GCC 15 (Peter Oberparleiter) - Fixes for -net: - [fa4c16e5903b] selftests: mptcp: connect: fix fallback note due to OoO (Matthieu Baerts (NGI0)) - [b00cc0dfd3ef] selftests: mptcp: join: rm: set backup flag (Matthieu Baerts (NGI0)) - [db4e86a2e6c2] selftests: mptcp: join: endpoints: longer transfer (Matthieu Baerts (NGI0)) - [732cf2c50ddb] selftests: mptcp: join: userspace: longer transfer (Matthieu Baerts (NGI0)) - [eb98322c2d06] selftests: mptcp: join: fastclose: drop plain RST (Matthieu Baerts (NGI0)): - Will be dropped soon - [604f4ade5c21] selftests: mptcp: connect: trunc: read all recv data (Matthieu Baerts (NGI0)) - [3c6e894585f2] mptcp: fix address removal logic in mptcp_pm_nl_rm_addr (Gang Yan) - Fixes for net-next: / - Features for net-next: - [8aa057db1bba] mptcp: pm: init and release mptcp_pm_ops (Geliang Tang) - [fd8a6842c53a] mptcp: pm: add get_local_id() interface (Geliang Tang) - [07d670ca1d24] mptcp: pm: add get_priority() interface (Geliang Tang): - blocked by pm->lock refactoring that is needed - [ffaa4e7399dc] mptcp: cleanup fallback data fin reception (Paolo Abeni) - [8c97e58c6aea] mptcp: cleanup fallback dummy mapping generation (Paolo Abeni): - there might be a fix for that - [6628958a45a2] mptcp: ensure the kernel PM does not take action too late (Paolo Abeni) - [692254038cb1] mptcp: do not miss early first subflow close event notification (Paolo Abeni) - [9f8782509d81] mptcp: make mptcp_destroy_common() static (Paolo Abeni) - [440bbc559b86] mptcp: drop the __mptcp_data_ready() helper (Paolo Abeni) - [6148a584cce9] mptcp: handle first subflow closing consistently (Paolo Abeni) - [6d5d949d5258] mptcp: borrow forward memory from subflow (Paolo Abeni) - [7984871487f7] mptcp: introduce mptcp-level backlog (Paolo Abeni) - [8afd86c5dc49] mptcp: leverage the backlog for RX packet processing (Paolo Abeni): - wait for the fix - [5d9a58722e9c] selftests: mptcp: lib: introduce 'nstat_{init,get}' (Matthieu Baerts (NGI0)) - [e5aad6ad52b4] selftests: mptcp: lib: remove stats files args (Matthieu Baerts (NGI0)) - [0cdbeae681cb] selftests: mptcp: lib: stats: remove nstat rate columns (Matthieu Baerts (NGI0)) - [e500e971e1bb] selftests: mptcp: join: dump stats from history (Matthieu Baerts (NGI0)) - [22e437406bc4] selftests: mptcp: lib: get counters from nstat history (Matthieu Baerts (NGI0)): - should be sent after the ones for net + merge with net-next - Features for net-next (next): / - Features for other trees: - [be06d52e341d] bpf: Add mptcp_subflow bpf_iter (Geliang Tang) - [599fef9658dd] selftests/bpf: More endpoints for endpoint_init (Geliang Tang) - [4f16da3ca774] selftests/bpf: Drop cgroup_fd of run_mptcpify (Geliang Tang) - [2eff5ee21d70] bpf: Add mptcp packet scheduler struct_ops (Geliang Tang) - [0d54dd03ab0d] bpf: Export mptcp packet scheduler helpers (Geliang Tang) - [2aca918a8b6e] selftests/bpf: Add bpf scheduler test (Geliang Tang) - [c4d2d29ba444] selftests/bpf: Add bpf_first scheduler & test (Geliang Tang) - [b65f96d93233] selftests/bpf: Add bpf_bkup scheduler & test (Geliang Tang) - [84e47205025f] selftests/bpf: Add bpf_rr scheduler & test (Geliang Tang) - [df0031f69a5c] selftests/bpf: Add bpf_red scheduler & test (Geliang Tang) - [b81ba7f0c095] selftests/bpf: Add bpf_burst scheduler & test (Geliang Tang): - waiting for a refactoring of the sched API Extra tests: - news about Syzkaller? (Matth): - Some issues there, but not reproduceable: https://syzkaller.appspot.com/upstream/s/mptcp - maybe: a memory corruption elsewhere? - not reproduced for one month - Packetdrill (Davide): - / - Patchew (Davide): - Was down this WE, but fixed by Davide - CI (Matth): - https://ci-results.mptcp.dev/flakes.html - https://netdev.bots.linux.dev/flakes.html?tn-needle=mptcp - / Next meeting: - Next one on Wednesday, the 19th of November. - 17:30 UTC (8.30am PDT, 5.30pm CEST, 11.30pm CST) - Still open to everyone! - https://annuel2.framapad.org/p/mptcp_upstreaming_20251119 Feel free to comment on these topics and suggest new ones for the next meeting! Talk to you soon, Matt -- Sponsored by the NGI0 Core fund.