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Alan Maguire says: ==================== As previously discussed here [1], long-lived sockets can miss a chance to set additional callbacks if a sock ops program was not attached early in their lifetime. Adding support to bpf_setsockopt() to set callback flags (and bpf_getsockopt() to retrieve them) provides other opportunities to enable callbacks, either directly via a cgroup/setsockopt intercepted setsockopt() or via a socket iterator. Patch 1 adds bpf_[get|set]sockopt() support; patch 2 adds testing for it via a sockops programs, along with verification via a cgroup/getsockopt program. Changes since v1 [2]: - Removed unneeded READ_ONCE() (Martin, patch 1) - Reworked sockopt test to leave existing tests undisturbed while adding test_nonstandard_opt() test to cover the TCP_BPF_SOCK_OPS_CB_FLAGS case; test verifies that value set via bpf_setsockopt() is what we expect via a call to getsockopt() which is caught by a cgroup/getsockopt program to provide the flags value (Martin, patch 2) - Removed unneeded iterator test (Martin) [1] https://lore.kernel.org/bpf/f42f157b-6e52-dd4d-3d97-9b86c84c0b00@oracle.com/ [2] https://lore.kernel.org/bpf/20240802152929.2695863-1-alan.maguire@oracle.com/ ==================== Signed-off-by: Martin KaFai Lau <martin.lau@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.