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Jeremy Harris says: ==================== tcp: fastopen: observability Whether TCP Fast Open was used for a connection is not reliably observable by an accepting application when the SYN passed no data. Fix this by noting during SYN receive processing that an acceptable Fast Open option was used, and provide this to userland via getsockopt TCP_INFO. ==================== Link: https://patch.msgid.link/20250423124334.4916-1-jgh@exim.org 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.