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644d037b2c
The R-Car and RZ/G2L Rx code paths were split in two separate implementations when support for RZ/G2L was added due to the fact that R-Car uses the extended descriptor format while RZ/G2L uses normal descriptors. This has led to a duplication of Rx logic with the only difference being the different Rx descriptors types used. The implementation however neglects to take into account that extended descriptors are normal descriptors with additional metadata at the end to carry hardware timestamp information. The hardware timestamp information is only consumed in the R-Car Rx loop and all the maintenance code around the Rx ring can be shared between the two implementations if the difference in descriptor length is carefully considered. This change merges the two implementations for Rx ring maintenance by adding a method to access both types of descriptors as normal descriptors, as this part covers all the fields needed for Rx ring maintenance the only difference between using normal or extended descriptor is the size of the memory region to allocate/free and the step size between each descriptor in the ring. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com> Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru> Signed-off-by: David S. Miller <davem@davemloft.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.