This adds support for phy rate matching: 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 matching, 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_MATCH_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 v6: - Don't announce that we've enabled pause frames for rate adaptation - Merry Christmas - Rename rate adaptation to rate matching - Reword documentation, (hopefully) taking into account feedback Changes in v5: - Break off patch "net: phy: Add 1000BASE-KX interface mode" for separate submission. - Document phy_rate_adaptation_to_str - Drop patch "Add some helpers for working with mac caps"; it has been incorperated into the autonegotiation patch. - Move phylink_cap_from_speed_duplex to this commit - Rebase onto net-next/master - Remove unnecessary comma 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: - Add phylink_cap_from_speed_duplex to look up the mac capability corresponding to the interface's speed. - Document MAC_(A)SYM_PAUSE - Include RATE_ADAPT_CRS; it's a few lines and it doesn't hurt. - Modify link settings directly in phylink_link_up, instead of doing things more indirectly via link_*. - 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: - Add (read-only) ethtool support for rate adaptation - Add comments clarifying the register defines - Add locking to phy_get_rate_adaptation - 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. - 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. - Reorder variables in aqr107_read_rate - Use int/defines instead of enum to allow for use in ioctls/netlink - 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. 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 matching net: phylink: Adjust link settings based on rate matching net: phylink: Adjust advertisement based on rate matching net: phy: aquantia: Add some additional phy interfaces net: phy: aquantia: Add support for rate matching 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 | 268 +++++++++++++++++-- include/linux/phy.h | 22 +- include/linux/phylink.h | 40 ++- 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, 440 insertions(+), 34 deletions(-) -- 2.35.1.1320.gc452695387.dirty
