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| Filename | Latest commit message | Latest commit date |
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c14a9f633d
Don't uninstall an XDP program when none is installed, and don't install an XDP program that has the same ID as the one already installed. dev_change_xdp_fd doesn't perform any checks in case it uninstalls an XDP program. It means that the driver's ndo_bpf can be called with XDP_SETUP_PROG asking to set it to NULL even if it's already NULL. This case happens if the user runs `ip link set eth0 xdp off` when there is no XDP program attached. The symmetrical case is possible when the user tries to set the program that is already set. The drivers typically perform some heavy operations on XDP_SETUP_PROG, so they all have to handle these cases internally to return early if they happen. This patch puts this check into the kernel code, so that all drivers will benefit from it. Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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| README | ||
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.