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Add a test to check that bpf_skb_check_mtu(BPF_MTU_CHK_SEGS) is rejected (-EINVAL) if skb->transport_header is not set. The test needs to lower the MTU of the loopback device. Thus, take this opportunity to run the test in a netns by adding "ns_" to the test name. The "serial_" prefix can then be removed. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20251112232331.1566074-2-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov <ast@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.