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A previous patch-set used page pool for Rx buffers allocations. To simplify the change, we first used page pool for one allocation per packet - one continuous buffer is allocated for each packet. This can be improved by using fragmented buffers, then memory consumption will be significantly reduced. WQE (Work Queue Element) includes up to 3 scatter/gather entries for data. As preparation for fragmented buffer usage, calculate number of scatter/gather entries which are required for packet according to maximum MTU and store it for future use. For now use PAGE_SIZE for each entry, which means that maximum buffer size is 3 * PAGE_SIZE. This is enough for the maximum MTU which is supported in the driver now (10K). Warn in an unlikely case of maximum MTU which requires more than 3 pages, for now this warn should not happen with standard page size (>=4K) and maximum MTU (10K). Signed-off-by: Amit Cohen <amcohen@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: Petr Machata <petrm@nvidia.com> Link: https://patch.msgid.link/98c3e3adb7e727e571ac538faf67cef262cec4fc.1719321422.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@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.