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8eb3cef8d2
Starting with firmware version MC10.18.0, we have support for L2 flow control. Asymmetrical configuration (Rx or Tx only) is supported, but not pause frame autonegotioation. Pause frame configuration is done via ethtool. By default, we start with flow control enabled on both Rx and Tx. Changes are propagated to hardware through firmware commands, using two flags (PAUSE, ASYM_PAUSE) to specify Rx and Tx pause configuration, as follows: PAUSE | ASYM_PAUSE | Rx pause | Tx pause ---------------------------------------- 0 | 0 | disabled | disabled 0 | 1 | disabled | enabled 1 | 0 | enabled | enabled 1 | 1 | enabled | disabled The hardware can automatically send pause frames when the number of buffers in the pool goes below a predefined threshold. Due to this, flow control is incompatible with Rx frame queue taildrop (both mechanisms target the case when processing of ingress frames can't keep up with the Rx rate; for large frames, the number of buffers in the pool may never get low enough to trigger pause frames as long as taildrop is enabled). So we set pause frame generation and Rx FQ taildrop as mutually exclusive. Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.