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In this patch, add the artifacts for 802.1d and 802.1q FID families that work in CFF flood mode. In CFF flood mode, the way flood vectors are looked up changes: there's a per-FID PGT base, to which a small offset is added depending on type of traffic. Thus each FID occupies a small contiguous block of PGT memory, whereas in the controlled flood mode, flood vectors for a given FID were spread across the PGT. The term "flood table" as used by the spectrum_fid module, borrows from controlled flood mode way of organizing the PGT table. There flood tables were actual tables, contiguous in the PGT. In the CFF flood mode, they are more abstract: a flood table becomes a collection of e.g. all first rows of the per-FID PGT blocks. Nonetheless we retain the nomenclature. FIDs are still configured through the SFMR register, but there are different fields to set under CFF mode: PGT base and profile. Thus register packing gets a dedicated op overload as well. The new organization of PGT makes it possible to treat the PGT as a block of an ordinary memory, allocate and deallocate on demand, and achieve better flexibility. Here instead, we aim to keep the code as close as possible to the previous controlled flood mode, support for which we need to retain for Spectrum-1 and older FW versions anyway. Thus the PGT footprint of the individual families is the same as before, just the internal organization of the per-family PGT region differs. Hence the pgt_size callback is reused between the controlled and CFF flood modes. Since the dummy family has no flood tables in either the CTL mode or in CFF mode, the existing one can be reused for the CFF family array. Users should not notice any changes between the controlled and CFF flood modes. Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Amit Cohen <amcohen@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://lore.kernel.org/r/ca40b8163e6d6a21f63ef299619acee953cf9519.1701183892.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.