net: sfp: add quirk for 2.5G copper SFP

Add a quirk for a copper SFP that identifies itself as "OEM"
"SFP-2.5G-T". This module's PHY is inaccessible, and can only run
at 2500base-X with the host without negotiation. Add a quirk to
enable the 2500base-X interface mode with 2500base-T support, and
disable autonegotiation.

Reported-by: Frank Wunderlich <frank-w@public-files.de>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 39e3095796d00e1cf26b578236b9a01de65112dd..9c1fa0b1737fbe0b8378f734f33c8481359dea23 100644 (file)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -360,6 +360,23 @@ static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id,
        __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces);
 }
 
+static void sfp_quirk_disable_autoneg(const struct sfp_eeprom_id *id,
+                                     unsigned long *modes,
+                                     unsigned long *interfaces)
+{
+       linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, modes);
+}
+
+static void sfp_quirk_oem_2_5g(const struct sfp_eeprom_id *id,
+                              unsigned long *modes,
+                              unsigned long *interfaces)
+{
+       /* Copper 2.5G SFP */
+       linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, modes);
+       __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces);
+       sfp_quirk_disable_autoneg(id, modes, interfaces);
+}
+
 static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id,
                                      unsigned long *modes,
                                      unsigned long *interfaces)
@@ -401,6 +418,7 @@ static const struct sfp_quirk sfp_quirks[] = {
        SFP_QUIRK_M("UBNT", "UF-INSTANT", sfp_quirk_ubnt_uf_instant),
 
        SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc),
+       SFP_QUIRK_M("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
        SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
        SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc),
        SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball),