282c0c798f
Relax the requirements to the XSK frame size to allow it to be smaller than a page and even not a power of two. The current implementation can work in this mode, both with Striding RQ and without it. The code that checks `mtu + headroom <= XSK frame size` is modified accordingly. Any frame size between 2048 and PAGE_SIZE is accepted. Functions that worked with pages only now work with XSK frames, even if their size is different from PAGE_SIZE. With XSK queues, regardless of the frame size, Striding RQ uses the stride size of PAGE_SIZE, and UMR MTTs are posted using starting addresses of frames, but PAGE_SIZE as page size. MTU guarantees that no packet data will overlap with other frames. UMR MTT size is made equal to the stride size of the RQ, because UMEM frames may come in random order, and we need to handle them one by one. PAGE_SIZE is just a power of two that is bigger than any allowed XSK frame size, and also it doesn't require making additional changes to the code. Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com> Reviewed-by: Saeed Mahameed <saeedm@mellanox.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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.