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Russell King says: ==================== net: add negotiation of in-band capabilities This is a repost without RFC for this series, shrunk down to 13 patches by removing the non-Marvell PCS. Phylink's handling of in-band has been deficient for a long time, and people keep hitting problems with it. Notably, situations with the way- to-late standardized 2500Base-X and whether that should or should not have in-band enabled. We have also been carrying a hack in the form of phylink_phy_no_inband() for a PHY that has been used on a SFP module, but has no in-band capabilities, not even for SGMII. When phylink is trying to operate in in-band mode, this series will look at the capabilities of the MAC-side PCS and PHY, and work out whether in-band can or should be used, programming the PHY as appropriate. This includes in-band bypass mode at the PHY. We don't... yet... support bypass on the MAC side PCS, because that requires yet more complexity. Patch 1 passes struct phylink and struct phylink_pcs into phylink_pcs_neg_mode() so we can look at more state in this function in a future patch. Patch 2 splits "cur_link_an_mode" (the MLO_AN_* mode) into two separate purposes - a requested and an active mode. The active mode is the one we will be using for the MAC, which becomes dependent on the result of in-band negotiation. Patch 3 adds debug to phylink_major_config() so we can see what is going on with the requested and active AN modes. Patch 4 adds to phylib a method to get the in-band capabilities of the PHY from phylib. Patches 5 and 6 add implementations for BCM84881 and some Marvell PHYs found on SFPs. Patch 7 adds to phylib a method to configure the PHY in-band signalling, and patch 8 implements it for those Marvell PHYs that support the method in patch 4. Patch 9 does the same as patch 4 but for the MAC-side PCS, with patches 10 and 11 adding support to Marvell NETA and PP2. Patch 12 adds the code to phylink_pcs_neg_mode() which looks at the capabilities, and works out whether to use in-band or out-band mode for driving the link between the MAC PCS and PHY. Patch 13 removes the phylink_phy_no_inband() hack now that we are publishing the in-band capabilities from the BCM84881 PHY driver. Three more PCS, omitted from this series due to the limit of 15 patches, will be sent once this has been merged. ==================== Link: https://patch.msgid.link/Z08kCwxdkU4n2V6x@shell.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
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