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When sending traffic to multiple ports with different link speeds, queued packets to one port can drown out tx to other ports. In order to better handle transmission to multiple ports, use the hardware shaper feature to implement weighted fair queueing between ports. Weight and maximum rate are automatically adjusted based on the link speed of the port. The first 3 queues are unrestricted and reserved for non-DSA direct tx on GMAC ports. The following queues are automatically assigned by the MTK DSA tag driver based on the target port number. The PPE offload code configures the queues for offloaded traffic in the same way. This feature is only supported on devices supporting QDMA. All queues still share the same DMA ring and descriptor pool. Signed-off-by: Felix Fietkau <nbd@nbd.name> Link: https://lore.kernel.org/r/20221116080734.44013-5-nbd@nbd.name 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 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.