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The mapping from priorities to buffers determines which buffers should be configured. Lossiness of these priorities combined with the mapping determines whether a given buffer should be lossy. Currently this configuration is stored implicitly in DCB ETS, PFC and ethtool PAUSE configuration. Keeping it together with the rest of the headroom configuration and deriving it as needed from PFC / ETS / PAUSE will make things clearer. To that end, add a field "prios" to struct mlxsw_sp_hdroom. Previously, __mlxsw_sp_port_headroom_set() took prio_tc as an argument, and assumed that the same mapping as we use on the egress should be used on ingress as well. Instead, track this configuration at each priority, so that it can be adjusted flexibly. In the following patches, as dcbnl_setbuffer is implemented, it will need to store its own mapping, and it will also be sometimes necessary to revert back to the original ETS mapping. Therefore track two buffer indices: the one for chip configuration (buf_idx), and the source one (ets_buf_idx). Introduce a function to configure the chip-level buffer index, and for now have it simply copy the ETS mapping over to the chip mapping. Update the ETS handler to project prio_tc to the ets_buf_idx and invoke the buf_idx recomputation. Now that there is a canonical place to look for this configuration, mlxsw_sp_port_headroom_set() does not need to invent def_prio_tc to use if DCB is compiled out. Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> 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.