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Russell King says: ==================== Pause updates for phylib and phylink Currently, phylib resolves the speed and duplex settings, which MAC drivers use directly. phylib also extracts the "Pause" and "AsymPause" bits from the link partner's advertisement, and stores them in struct phy_device's pause and asym_pause members with no further processing. It is left up to each MAC driver to implement decoding for this information. phylink converted drivers are able to take advantage of code therein which resolves the pause advertisements for the MAC driver, but this does nothing for unconverted drivers. It also does not allow us to make use of hardware-resolved pause states offered by several PHYs. This series aims to address this by: 1. Providing a generic implementation, linkmode_resolve_pause(), that takes the ethtool linkmode arrays for the link partner and local advertisements, decoding the result to whether pause frames should be allowed to be transmitted or received and acted upon. I call this the pause enablement state. 2. Providing a phylib implementation, phy_get_pause(), which allows MAC drivers to request the pause enablement state from phylib. 3. Providing a generic linkmode_set_pause() for setting the pause advertisement according to the ethtool tx/rx flags - note that this design has some shortcomings, see the comments in the kerneldoc for this function. 4. Remove the ability in phylink to set the pause states for fixed links, which brings them into line with how we deal with the speed and duplex parameters; we can reintroduce this later if anyone requires it. This could be a userspace-visible change. 5. Split application of manual pause enablement state from phylink's resolution of the same to allow use of phylib's new phy_get_pause() interface by phylink, and make that switch. 6. Resolve the fixed-link pause enablement state using the generic linkmode_resolve_pause() helper introduced earlier. This, in connection with the previous commits, allows us to kill the MLO_PAUSE_SYM and MLO_PAUSE_ASYM flags. 7. make phylink's ethtool pause setting implementation update the pause advertisement in the same way that phylib does, with the same caveats that are present there (as mentioned above w.r.t linkmode_set_pause()). 8. create a more accurate initial configuration for MACs, used when phy_start() is called or a SFP is detected. In particular, this ensures that the pause bits seen by MAC drivers in state->pause are accurate for SGMII. 9. finally, update the kerneldoc descriptions for mac_config() for the above changes. This series has been build-tested against net-next; the boot tested patches are in my "phy" branch against v5.5 plus the queued phylink changes that were merged for 5.6. The next series will introduce the ability for phylib drivers to provide hardware resolved pause enablement state. These patches can be found in my "phy" branch. ==================== 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.