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Zerocopy skbs are converted to regular copy skbs when data is queued to a local socket. This happens in the existing test with a sender and receiver communicating over a veth device. Zerocopy skbs are sent without copying if egressing a device. Verify that this behavior is maintained even in the common container setup where data is forwarded over a veth to the physical device. Update msg_zerocopy.sh to 1. Have a dummy network device to simulate a physical device. 2. Have forwarding enabled between veth and dummy. 3. Add a tx-only test that sends out dummy via the forwarding path. 4. Verify the exitcode of the sender, which signals zerocopy success. As dummy drops all packets, this cannot be a TCP connection. Test the new case with unconnected UDP only. Update msg_zerocopy.c to - Accept an argument whether send with zerocopy is expected. - Return an exitcode whether behavior matched that expectation. Signed-off-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250630194312.1571410-3-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.