This adds support for phy rate adaptation: when a phy adapts between differing phy interface and link speeds. It was originally submitted as part of [1], which is considered "v1" of this series. Several past discussions [2-4] around adding rate adaptation provide some context. Although in earlier versions of this series, userspace could disable rate adaptation, now it is only possible to determine the current rate adaptation type. Disabling or otherwise configuring rate adaptation has been left for future work. However, because currently only RATE_ADAPT_PAUSE is implemented, it is possible to disable rate adaptation by modifying the advertisement appropriately. [1] https://lore.kernel.org/netdev/20220715215954.1449214-1-sean.anderson@xxxxxxxx/T/#t [2] https://lore.kernel.org/netdev/1579701573-6609-1-git-send-email-madalin.bucur@xxxxxxxxxxx/ [3] https://lore.kernel.org/netdev/1580137671-22081-1-git-send-email-madalin.bucur@xxxxxxxxxxx/ [4] https://lore.kernel.org/netdev/20200116181933.32765-1-olteanv@xxxxxxxxx/ Changes in v5: - Document phy_rate_adaptation_to_str - Remove unnecessary comma - Move phylink_cap_from_speed_duplex to this commit - Drop patch "Add some helpers for working with mac caps"; it has been incorperated into the autonegotiation patch. - Break off patch "net: phy: Add 1000BASE-KX interface mode" for separate submission. - Rebase onto net-next/master Changes in v4: - Export phy_rate_adaptation_to_str - Remove phylink_interface_max_speed, which was accidentally added - Split off the LS1046ARDB 1G fix Changes in v3: - Document MAC_(A)SYM_PAUSE - Modify link settings directly in phylink_link_up, instead of doing things more indirectly via link_*. - Add phylink_cap_from_speed_duplex to look up the mac capability corresponding to the interface's speed. - Include RATE_ADAPT_CRS; it's a few lines and it doesn't hurt. - Move unused defines to next commit (where they will be used) - Remove "Support differing link/interface speed/duplex". It has been rendered unnecessary due to simplification of the rate adaptation patches. Thanks Russell! - Rewrite cover letter to better reflect the opinions of the developers involved Changes in v2: - Use int/defines instead of enum to allow for use in ioctls/netlink - Add locking to phy_get_rate_adaptation - Add (read-only) ethtool support for rate adaptation - Move part of commit message to cover letter, as it gives a good overview of the whole series, and allows this patch to focus more on the specifics. - Use the phy's rate adaptation setting to determine whether to use its link speed/duplex or the MAC's speed/duplex with MLO_AN_INBAND. - Always use the rate adaptation setting to determine the interface speed/duplex (instead of sometimes using the interface mode). - Determine the interface speed and max mac speed directly instead of guessing based on the caps. - Add comments clarifying the register defines - Reorder variables in aqr107_read_rate Sean Anderson (8): net: phylink: Document MAC_(A)SYM_PAUSE net: phylink: Export phylink_caps_to_linkmodes net: phylink: Generate caps and convert to linkmodes separately net: phy: Add support for rate adaptation net: phylink: Adjust link settings based on rate adaptation net: phylink: Adjust advertisement based on rate adaptation net: phy: aquantia: Add some additional phy interfaces net: phy: aquantia: Add support for rate adaptation Documentation/networking/ethtool-netlink.rst | 2 + drivers/net/phy/aquantia_main.c | 68 ++++- drivers/net/phy/phy-core.c | 21 ++ drivers/net/phy/phy.c | 28 ++ drivers/net/phy/phylink.c | 270 +++++++++++++++++-- include/linux/phy.h | 22 +- include/linux/phylink.h | 27 +- include/uapi/linux/ethtool.h | 18 +- include/uapi/linux/ethtool_netlink.h | 1 + net/ethtool/ioctl.c | 1 + net/ethtool/linkmodes.c | 5 + 11 files changed, 429 insertions(+), 34 deletions(-) -- 2.35.1.1320.gc452695387.dirty
