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Russell King says: ==================== net: phylink: improve PHY validation One of the issues which has concerned me about the rate matching implenentation that we have is that phy_get_rate_matching() returns whether rate matching will be used for a particular interface, and we enquire only for one interface. Aquantia PHYs can be programmed with the rate matching and interface mode settings on a per-media speed basis using the per-speed vendor 1 global configuration registers. Thus, it is possible for the PHY to be configured to use rate matching for 10G, 5G, 2.5G with 10GBASE-R, and then SGMII for the remaining speeds. Therefore, it clearly doesn't make sense to enquire about rate matching for just one interface mode. Also, PHYs that change their interfaces are handled sub-optimally, in that we validate all the interface modes that the host supports, rather than the interface modes that the PHY will use. This patch series changes the way we validate PHYs, but in order to do so, we need to know exactly which interface modes will be used by the PHY. So that phylib can convey this information, we add "possible_interfaces" to struct phy_device. possible_interfaces is to be filled in by a phylib driver once the PHY is configured (in other words in the PHYs .config_init method) with the interface modes that it will switch between. This then allows users of phylib to know which interface modes will be used by the PHY. This allows us to solve both these issues: where possible_interfaces is provided, we can validate which ethtool link modes can be supported by looking at which interface modes that both the PHY and host support, and request rate matching information for each mode. This should improve the accuracy of the validation. Sending this out again without RFC as Jie Luo will need it for the QCA8084 changes. No changes except to add the attributations already received. Thanks! ==================== Link: https://lore.kernel.org/r/ZWCWn+uNkVLPaQhn@shell.armlinux.org.uk 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
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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.