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Add the bpf_sock_ops_enable_tx_tstamp kfunc to allow BPF programs to selectively enable TX timestamping on a skb during tcp_sendmsg(). For example, BPF program will limit tracking X numbers of packets and then will stop there instead of tracing all the sendmsgs of matched flow all along. It would be helpful for users who cannot afford to calculate latencies from every sendmsg call probably due to the performance or storage space consideration. Signed-off-by: Jason Xing <kerneljasonxing@gmail.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250220072940.99994-12-kerneljasonxing@gmail.com
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.