[Weekly meetings] MoM - 11th of March 2026

[Matthieu Baerts <matttbe@kernel.org>]

Hello everyone,

Two weeks ago, we had our new meeting with Mat (Cruise), 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 (NGI0)):

14449624: [net,1/5] selftests: mptcp: more stable simult_flows tests
14449625: [net,2/5] mptcp: pm: avoid sending RM_ADDR over same subflow
14449626: [net,3/5] selftests: mptcp: join: check RM_ADDR not sent over
same subflow
14449627: [net,4/5] mptcp: pm: in-kernel: always mark signal+subflow
endp as used
14449628: [net,5/5] selftests: mptcp: join: check removing
signal+subflow endp:
    - Series: mptcp: misc fixes for v7.0-rc2
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1060560&state=*&archive=both

14451810: [net-next,V2,RESEND] tcp: shrink per-packet memset in
__tcp_transmit_skb():
    - Submitter: Keita Morisaki
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260304111517.2088694-1-kmta1236@gmail.com/


    our repo (by: Matthieu Baerts (NGI0)):

14427551: [mptcp-net] mptcp: pm: in-kernel: always mark signal+subflow
endp as used:
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260218-mptcp-issue-613-v1-1-f8e9adb12010@kernel.org/

14428224: [mptcp-net] selftests: mptcp: join: check removing
signal+subflow endp:
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260219101033.716403-2-matttbe@kernel.org/

14429639: [mptcp-net,v2,1/2] mptcp: pm: avoid sending RM_ADDR over same
subflow
14429640: [mptcp-net,v2,2/2] selftests: mptcp: join: check RM_ADDR not
sent over same subflow:
    - Series: mptcp: pm: avoid sending RM_ADDR over the same subflow
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1055875&state=*&archive=both

14432575: [mptcp-next] mptcp: pm: in-kernel: remove
mptcp_pm_has_addr_attr_id:
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260223-mptcp_pm_has_addr_attr_id-v1-1-1efb38ad6488@kernel.org/

14432728: [mptcp-next] selftests: mptcp: join: recreate signal endp with
same ID:
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260223-mptcp-sft-re-use-id-v1-1-ec648a8bda22@kernel.org/



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: Keita Morisaki, Matthieu Baerts
(NGI0), Simon Baatz, Wesley Atwell):

14461679: [net-next,1/2] mptcp: better mptcp-level RTT estimator
14461680: [net-next,2/2] mptcp: add receive queue awareness in
tcp_rcv_space_adjust():
    - Series: mptcp: autotune related improvement
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1063766&state=*&archive=both
    - → AI review spot issues, to be addressed
    - NIPA got one failure

14460614: [net-next,v3,1/6] tcp: implement RFC 7323 window retraction
receiver requirements
14460615: [net-next,v3,2/6] mptcp: keep rcv_mwnd_seq in sync with
subflow rcv_wnd
14460616: [net-next,v3,3/6] tcp: increase LINUX_MIB_BEYOND_WINDOW for
SKB_DROP_REASON_TCP_OVERWINDOW
14460617: [net-next,v3,4/6] selftests/net: packetdrill: add
tcp_rcv_wnd_shrink_nomem.pkt
14460618: [net-next,v3,5/6] selftests/net: packetdrill: add
tcp_rcv_wnd_shrink_allowed.pkt
14460619: [net-next,v3,6/6] selftests/net: packetdrill: add
tcp_rcv_neg_window.pkt:
    - State: New
    - Series: tcp: RFC 7323-compliant window retraction handling
    - Submitter: Simon Baatz
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1063485&state=*&archive=both
    - To be reviewed

14467818: [net,1/7] tcp: track advertise-time scaling basis for rcv_wnd
14467819: [net,2/7] tcp: preserve rcv_wnd snapshot when updating
advertised windows
14467820: [net,3/7] tcp: honor advertised receive window in memory
admission and clamping
14467821: [net,4/7] tcp: extend TCP_REPAIR_WINDOW with receive-window
scaling snapshot
14467823: [net,5/7] mptcp: refresh tcp rcv_wnd snapshot when syncing
receive windows
14467822: [net,6/7] tcp: expose rmem and backlog accounting in
rcvbuf_grow tracepoints
14467824: [net,7/7] selftests: tcp_ao: cover legacy and extended
TCP_REPAIR_WINDOW layouts:
    - State: New
    - Series: tcp: preserve advertised rwnd accounting across
receive-memory decisions
    - Submitter: Wesley Atwell
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1064867&state=*&archive=both
    - Will need to wait for Simon's series to be applied first

14444435: [net] mptcp: fix soft lockup in mptcp_recvmsg():
    - State: New
    - Submitter: Li Xiasong
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260302052651.1466983-1-lixiasong1@huawei.com/



    our repo (by: Christoph Paasch, Gang Yan, Geliang Tang, Gregory
Detal, Li Xiasong, Matthieu Baerts, Matthieu Baerts (NGI0)):

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

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

14332026: [RFC,mptcp-next] mptcp: support net.ipv4.tcp_rcvbuf_low_rtt:
    - State: Changes requested
    - Submitter: Matthieu Baerts (NGI0)
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20251127-mptcp-tcp_rcvbuf_low_rtt-v1-1-fa080d67f2e5@kernel.org/
    - Status: same as last time

14365754: [mptcp-next,v2,1/3] mptcp: implement psock_update_sk_prot
14365756: [mptcp-next,v2,3/3] selftests/bpf: Update sockmap tests for MPTCP:
    - State: Needs ack
    - Series: implement psock_update_sk_prot
    - Submitter: Geliang Tang
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1038151&state=*&archive=both
    - Status: same as last time

14378488: [RFC,mptcp-next,v8,1/9] selftests: mptcp: add tcp tls tests
14378489: [RFC,mptcp-next,v8,2/9] tls: introduce struct tls_prot_ops
14378490: [RFC,mptcp-next,v8,3/9] tls: add ops in tls_context
14378492: [RFC,mptcp-next,v8,5/9] mptcp: update mptcp_check_readable
14378493: [RFC,mptcp-next,v8,6/9] mptcp: implement tls_mptcp_ops
14378494: [RFC,mptcp-next,v8,7/9] mptcp: update ULP getsockopt
14378495: [RFC,mptcp-next,v8,8/9] mptcp: enable TLS setsockopt
14378496: [RFC,mptcp-next,v8,9/9] selftests: mptcp: add mptcp tls tests:
    - State: Needs ack
    - Series: MPTCP KTLS support
    - Submitter: Geliang Tang
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1041671&state=*&archive=both
    - Status: same as last time

14409840: [mptcp-next,v2,1/2] mptcp: check desc->count in read_sock
14409841: [mptcp-next,v2,2/2] tcp: add recv_should_stop helper:
    - State: Needs ack
    - Series: add tcp_recv_should_stop helper
    - Submitter: Geliang Tang
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1050056&state=*&archive=both
    - Status: same as last time

14410371: [mptcp-next,v2,1/3] tcp: export do_tcp_splice_eof
14410372: [mptcp-next,v2,2/3] mptcp: implement .splice_eof
14410373: [mptcp-next,v2,3/3] selftests: mptcp: connect: trigger splice_eof:
    - State: Needs ack
    - Series: implement .splice_eof
    - Status: same as last time

14413156: [mptcp-net,1/3] mptcp: add backlog_list bug reproducer test
14413157: [mptcp-net,2/3] mptcp: fix receive stalls when 'ack_seq' in
backlog_list
14443235: [RESEND,mptcp-net,v2] mptcp: fix stall because of data_ready:
    - State: Changes requested
    - Submitter: Gang Yan
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260228011511.440437-1-gang.yan@linux.dev/
    - Status: same as last time

14454006: [RFC,mptcp-next,v4,1/8] mptcp: add sk_is_msk helper
14454007: [RFC,mptcp-next,v4,2/8] nvmet-tcp: add mptcp support
14454008: [RFC,mptcp-next,v4,3/8] nvme-tcp: add mptcp support
14454009: [RFC,mptcp-next,v4,4/8] mptcp: add sock_set_nodelay
14454010: [RFC,mptcp-next,v4,5/8] mptcp: add sock_set_reuseaddr
14454011: [RFC,mptcp-next,v4,6/8] mptcp: add sock_set_syncnt
14454012: [RFC,mptcp-next,v4,7/8] selftests: mptcp: add NVMe-over-MPTCP test
14454013: [RFC,mptcp-next,v4,8/8] selftests: mptcp: nvme: set iopolicy:
    - State: Under review
    - Series: NVME over MPTCP
    - Submitter: Geliang Tang
    - URL:
https://patchwork.kernel.org/project/mptcp/list/?series=1061679&state=*&archive=both
    - AI review found some issues

14456317: [RESEND,mptcp-net] mptcp: sync the msk->sndbuf at accept() time:
    - State: New
    - Submitter: Gang Yan
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260306062316.1333680-1-gang.yan@linux.dev/
    - To be reviewed

14460375: [mptcp-next] mptcp: preserve MSG_EOR semantics in sendmsg path:
    - State: New
    - Submitter: Gang Yan
    - URL:
https://patchwork.kernel.org/project/mptcp/patch/20260309025431.125943-1-gang.yan@linux.dev/
    - AI review found some issues



Issues on GitHub:
    https://github.com/multipath-tcp/mptcp_net-next/issues/

    Recently opened (latest from the last meeting: 616):

  618  `TCP_RTO_MIN`/`MAX`: used configured values if any [enhancement]:
      - to imitate TCP and being able to modify these values

  617  CI: Stalls when starting a VSOCK listening socket: soft lockups,
RCU stalls, timeout [CI] @matttbe:
      - It should be fixed now, TODO close → done


    Recently discussed:

  616  Subflow on a inactive and disconnected network path disconnects
after ~16 minutes [bug]:
      - Possible but not due to MPTCP: can be closed → TODO Matth → done


    Bugs (opened, flagged as "bug" and assigned)

  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)

  616  Subflow on a inactive and disconnected network path disconnects
after ~16 minutes [bug]
  602  A query about the update of 'msk->sk_sndbuf' [bug]
  600  mptcp: avoid dropping partial packets [bug]
  599  [syzbot] possible deadlock in `mptcp_subflow_create_socket`:
`nbd` has a lockdep dependency between `reclaim` and `af_socket` [bug]
[syzkaller]
  592  Lower throughput with MPTCP vs TCP [bug]
  587  in-kernel PM: Server is only using single IP to establish
subflows [bug]
  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]
  572  [syzkaller] WARNING in `skb_try_coalesce` [bug] [syzkaller]
  549  pm: in-kernel: set `msk->pm.work_pending` back to `true` [bug] [pm]
  492  userspace pm: subflows counter: not updated when a subflows is
removed from the other end [bug]
  491  selftests: `mptcp_join`: tests `I        see
list-github.shnfinite 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]
  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]


    In Progress (opened, new feature and assigned)

  568  socket option: support `IPV6_TCLASS` [enhancement] @geliangtang
  521  Implement psock_update_sk_prot, for eBPF SOCKMAP support
[enhancement] [bpf] @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]


    For later (opened and not assigned)

  618  `TCP_RTO_MIN`/`MAX`: used configured values if any [enhancement]
  610  MPTCP tree in `linux-next` [enhancement]
  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]
  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]
  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]
  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]
  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]
   41  reduce indirect call usage [enhancement]
   24  Revisit layout of struct mptcp_subflow_context [enhancement]


    Recently closed (since 2026-02-25)

  615  subflow not re-established after endpoint of "primary" connection
is removed and re-added with same ID [bug]
  614  `ip mptcp monitor`: support JSON format (`-j`) [enhancement] @matttbe
  613  [syzkaller] WARNING in `mptcp_pm_nl_del_addr_doit` [bug]
[syzkaller] [reproducer] @matttbe
  612  Re-Announcing ADD_ADDR with in-kernel PM [bug] @matttbe
  607  selftests: `simult_flows`: "unbalanced bwidth with opposed,
unbalanced delay" (+ "reverse direction") are unstable [bug] [selftests]
[reproducer] [bisected]


    Packetdrill PRs

  189  2 days ago   Dwyane-Yan   packetdrill: mptcp: add tests for MSG_EOR:
      - TODO: Matth: review → done

  162  26 days ago  geliangtang  mptcp: add splice test
  52   1 year ago   dcaratti     Add initial coverage for RM_ADDR


    mptcp.dev PRs: /


    mptcp-upstream-virtme-docker PRs: /


    mptcpd PRs: /





FYI: Current Roadmap:
    - Bugs:
https://github.com/multipath-tcp/mptcp_net-next/issues?q=is%3Aissue+is%3Aopen+label%3Abug
    - Current/Coming merge window (7.1):
https://github.com/orgs/multipath-tcp/projects/19
    - For later: https://github.com/orgs/multipath-tcp/projects/1



Patches to send to NetDev:

    - Fixes for other trees:

        - [58535a1a00ba] sched/mmcid: Prevent CID stalls due to
concurrent forks (Thomas Gleixner)
        - [dc4df81603ff] sched/mmcid: Handle vfork()/CLONE_VM correctly
(Thomas Gleixner)
        - [4e6e9b341560] sched/mmcid: Remove pointless preempt guard
(Thomas Gleixner)
        - [0dadc10e3a66] sched/mmcid: Avoid full tasklist walks (Thomas
Gleixner)

    - Fixes for -net: /

    - Fixes for net-next: /

    - Features for net-next:

        - [e86d88851e53] mptcp: pm: init and release mptcp_pm_ops
(Geliang Tang)
        - [9adf74d1ce9c] mptcp: pm: add get_local_id() interface
(Geliang Tang)
        - [3a3e7b678003] mptcp: pm: add get_priority() interface
(Geliang Tang):
            - Waiting for PM lock refactoring

        - [83518836880e] mptcp: better mptcp-level RTT estimator (Paolo
Abeni):
            - Fix needed
        - [273a85281187] mptcp: add receive queue awareness in
tcp_rcv_space_adjust() (Paolo Abeni)

        - [11eb291df687] mptcp: pm: in-kernel: remove
mptcp_pm_has_addr_attr_id (Matthieu Baerts (NGI0))
        - [238b8130d166] selftests: mptcp: join: recreate signal endp
with same ID (Matthieu Baerts (NGI0)):
            - Can wait

    - Features for net-next (next):


    - Features for other trees:

        - [74a4438ec820] bpf: Add mptcp_subflow bpf_iter (Geliang Tang)
        - [83c02b6ccff9] selftests/bpf: More endpoints for endpoint_init
(Geliang Tang)
        - [6afcba0c99d8] selftests/bpf: Drop cgroup_fd of run_mptcpify
(Geliang Tang)
        - [e7e8cc7d67e7] bpf: Add mptcp packet scheduler struct_ops
(Geliang Tang)
        - [bf5a7a035c17] bpf: Export mptcp packet scheduler helpers
(Geliang Tang)
        - [60e6ed6212dc] selftests/bpf: Add bpf scheduler test (Geliang
Tang)
        - [68e69d296827] selftests/bpf: Add bpf_first scheduler & test
(Geliang Tang)
        - [c581557d9e58] selftests/bpf: Add bpf_bkup scheduler & test
(Geliang Tang)
        - [c17cf47b4e4f] selftests/bpf: Add bpf_rr scheduler & test
(Geliang Tang)
        - [e37d6d9a3991] selftests/bpf: Add bpf_red scheduler & test
(Geliang Tang)
        - [0fd203a514e6] selftests/bpf: Add bpf_burst scheduler & test
(Geliang Tang):
            - Wait for sched API refactoring




Extra tests:
    - news about Syzkaller? (Matth):
        - /

    - Packetdrill (Davide):
        - /

    - Patchew (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 25th of March.
    - 17:30 UTC (8.30am PDT, 5.30pm CEST, 11.30pm CST)
    - Still open to everyone!
    - https://annuel2.framapad.org/p/mptcp_upstreaming_20260325



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.