Re: [PATCH 0/3] mptcp: add RECVERR and MSG_ERRQUEUE support

[Matthieu Baerts <matttbe@kernel.org>]

Hi David,

On 21/04/2026 17:22, David Carlier wrote:
> MPTCP already advertises IP_RECVERR/IPV6_RECVERR as supported, but the
> parent socket does not currently provide usable MSG_ERRQUEUE handling.
> 
> This series wires the MPTCP socket up to the IPv4/IPv6 error queue
> paths. It propagates RECVERR-related sockopts to existing and future
> subflows, makes poll() report pending errqueue activity through the
> parent socket, and allows recvmsg(MSG_ERRQUEUE) on the MPTCP socket to
> consume queued errors with the parent socket ABI.
> 
> The series also handles mixed-family subflows by applying the matching
> sockopt according to each subflow family, and avoids silently losing an
> error skb if requeueing to the parent socket fails under rmem pressure.
Thank you for this series!

Even if I agree it would be good to have full MSG_ERRQUEUE support,
net-next is currently closed, and only bug fixes are accepted, see:

  https://docs.kernel.org/process/maintainer-netdev.html

pw-bot: defer

Instead, I suggest switching the discussions only to the MPTCP ML if
that's OK. If the CI is happy, someone will try to review it over there,
when time permits. If not, please send the new versions only to the
MPTCP ML, with the 'PATCH mptcp-next' prefix, and ideally on top of the
'export' (or 'for-review') branch of our tree. For more details:

  https://www.mptcp.dev/contributing.html#kernel-development

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.