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Martin KaFai says: ==================== This set allows the bpf-tcp-cc to call bpf_setsockopt. One use case is to allow a bpf-tcp-cc switching to another cc during init(). For example, when the tcp flow is not ecn ready, the bpf_dctcp can switch to another cc by calling setsockopt(TCP_CONGESTION). bpf_getsockopt() is also added to have a symmetrical API, so less usage surprise. v2: - Not allow switching to kernel's tcp_cdg because it is the only kernel tcp-cc that stores a pointer to icsk_ca_priv. Please see the commit log in patch 1 for details. Test is added in patch 4 to check switching to tcp_cdg. - Refactor the logic finding the offset of a func ptr in the "struct tcp_congestion_ops" to prog_ops_moff() in patch 1. - bpf_setsockopt() has been disabled in release() since v1 (please see commit log in patch 1 for reason). bpf_getsockopt() is also disabled together in release() in v2 to avoid usage surprise because both of them are usually expected to be available together. bpf-tcp-cc can already use PTR_TO_BTF_ID to read from tcp_sock. ==================== 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 Restructured Text 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.