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ee458a3f31
We are soon using it for incoming data processing. MPTCP can't leverage the sk_backlog, as the latter is processed before the release callback, and such callback for MPTCP releases and re-acquire the socket spinlock, breaking the sk_backlog processing assumption. Add a skb backlog list inside the mptcp sock struct, and implement basic helper to transfer packet to and purge such list. Packets in the backlog are memory accounted and still use the incoming subflow receive memory, to allow back-pressure. The backlog size is implicitly bounded to the sum of subflows rcvbuf. When a subflow is closed, references from the backlog to such sock are removed. No packet is currently added to the backlog, so no functional changes intended here. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20251121-net-next-mptcp-memcg-backlog-imp-v1-13-1f34b6c1e0b1@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.