Merge branch 'Fix-10G-PHY-interface-types'

Russell King says:

====================
Fix 10G PHY interface types

Recent discussion has revealed that our current usage of the 10GKR
phy_interface_t is not correct. This is based on a misunderstanding
caused in part by the various specifications being difficult to
obtain. Now that a better understanding has been reached, we ought
to correct this.

This series introduce PHY_INTERFACE_MODE_10GBASER to replace the
existing usage of 10GKR mode, and document their differences in the
phylib documentation. Then switch PHY, SFP/phylink, the Marvell
PP2 network driver, and its associated comphy driver over to use
the correct interface mode. None of the existing platform usage
was actually using 10GBASE-KR.

In order to maintain compatibility with existing DT files, arrange
for the Marvell PP2 driver to rewrite the phy interface mode; this
allows other drivers to adopt correct behaviour w.r.t whether the
10G connection conforms to the backplane 10GBASE-KR protocol vs
normal 10GBASE-R protocol.

After applying these locally to net-next I've validated that the
only places which mention the old PHY_INTERFACE_MODE_10GKR
definition are:

Documentation/networking/phy.rst:``PHY_INTERFACE_MODE_10GKR``
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c:        if (phy_mode == PHY_INTERFACE_MODE_10GKR)
drivers/net/phy/aquantia_main.c:                phydev->interface = PHY_INTERFACE_MODE_10GKR;
drivers/net/phy/aquantia_main.c:            phydev->interface != PHY_INTERFACE_MODE_10GKR &&
include/linux/phy.h:    PHY_INTERFACE_MODE_10GKR,
include/linux/phy.h:    case PHY_INTERFACE_MODE_10GKR:

which is as expected.  The only users of "10gbase-kr" in DT are:

arch/arm64/boot/dts/marvell/armada-7040-db.dts: phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-clearfog-gt-8k.dts:     phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-db.dts: phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-db.dts: phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-mcbin-singleshot.dts:   phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-mcbin-singleshot.dts:   phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts:      phy-mode = "10gbase-kr";arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts:      phy-mode = "10gbase-kr";arch/arm64/boot/dts/marvell/cn9130-db.dts:      phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/cn9131-db.dts:      phy-mode = "10gbase-kr";
arch/arm64/boot/dts/marvell/cn9132-db.dts:      phy-mode = "10gbase-kr";

which all use the mvpp2 driver, and these will be updated in a
separate patch to be submitted in the following kernel cycle.

v2: add comment to mvpp2 driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 29 insertions, 15 deletions

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index cd32c7196a7f..72133cbe55d4 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -1114,7 +1114,7 @@ mvpp2_shared_interrupt_mask_unmask(struct mvpp2_port *port, bool mask)
 /* Port configuration routines */
 static bool mvpp2_is_xlg(phy_interface_t interface)
 {
-	return interface == PHY_INTERFACE_MODE_10GKR ||
+	return interface == PHY_INTERFACE_MODE_10GBASER ||
 	       interface == PHY_INTERFACE_MODE_XAUI;
 }
 
@@ -1200,7 +1200,7 @@ static int mvpp22_gop_init(struct mvpp2_port *port)
 	case PHY_INTERFACE_MODE_2500BASEX:
 		mvpp22_gop_init_sgmii(port);
 		break;
-	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_10GBASER:
 		if (port->gop_id != 0)
 			goto invalid_conf;
 		mvpp22_gop_init_10gkr(port);
@@ -1649,7 +1649,7 @@ static void mvpp22_pcs_reset_deassert(struct mvpp2_port *port)
 	xpcs = priv->iface_base + MVPP22_XPCS_BASE(port->gop_id);
 
 	switch (port->phy_interface) {
-	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_10GBASER:
 		val = readl(mpcs + MVPP22_MPCS_CLK_RESET);
 		val |= MAC_CLK_RESET_MAC | MAC_CLK_RESET_SD_RX |
 		       MAC_CLK_RESET_SD_TX;
@@ -4758,7 +4758,7 @@ static void mvpp2_phylink_validate(struct phylink_config *config,
 
 	/* Invalid combinations */
 	switch (state->interface) {
-	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_10GBASER:
 	case PHY_INTERFACE_MODE_XAUI:
 		if (port->gop_id != 0)
 			goto empty_set;
@@ -4780,7 +4780,7 @@ static void mvpp2_phylink_validate(struct phylink_config *config,
 	phylink_set(mask, Asym_Pause);
 
 	switch (state->interface) {
-	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_10GBASER:
 	case PHY_INTERFACE_MODE_XAUI:
 	case PHY_INTERFACE_MODE_NA:
 		if (port->gop_id == 0) {
@@ -5247,6 +5247,15 @@ static int mvpp2_port_probe(struct platform_device *pdev,
 		goto err_free_netdev;
 	}
 
+	/*
+	 * Rewrite 10GBASE-KR to 10GBASE-R for compatibility with existing DT.
+	 * Existing usage of 10GBASE-KR is not correct; no backplane
+	 * negotiation is done, and this driver does not actually support
+	 * 10GBASE-KR.
+	 */
+	if (phy_mode == PHY_INTERFACE_MODE_10GKR)
+		phy_mode = PHY_INTERFACE_MODE_10GBASER;
+
 	if (port_node) {
 		comphy = devm_of_phy_get(&pdev->dev, port_node, NULL);
 		if (IS_ERR(comphy)) {
diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
index 975789d9349d..31927b2c7d5a 100644
--- a/drivers/net/phy/aquantia_main.c
+++ b/drivers/net/phy/aquantia_main.c
@@ -358,9 +358,11 @@ static int aqr107_read_status(struct phy_device *phydev)
 
 	switch (FIELD_GET(MDIO_PHYXS_VEND_IF_STATUS_TYPE_MASK, val)) {
 	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_KR:
-	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_XFI:
 		phydev->interface = PHY_INTERFACE_MODE_10GKR;
 		break;
+	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_XFI:
+		phydev->interface = PHY_INTERFACE_MODE_10GBASER;
+		break;
 	case MDIO_PHYXS_VEND_IF_STATUS_TYPE_USXGMII:
 		phydev->interface = PHY_INTERFACE_MODE_USXGMII;
 		break;
@@ -493,7 +495,8 @@ static int aqr107_config_init(struct phy_device *phydev)
 	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
 	    phydev->interface != PHY_INTERFACE_MODE_XGMII &&
 	    phydev->interface != PHY_INTERFACE_MODE_USXGMII &&
-	    phydev->interface != PHY_INTERFACE_MODE_10GKR)
+	    phydev->interface != PHY_INTERFACE_MODE_10GKR &&
+	    phydev->interface != PHY_INTERFACE_MODE_10GBASER)
 		return -ENODEV;
 
 	WARN(phydev->interface == PHY_INTERFACE_MODE_XGMII,
diff --git a/drivers/net/phy/bcm84881.c b/drivers/net/phy/bcm84881.c
index db59911b9b3c..14d55a77eb28 100644
--- a/drivers/net/phy/bcm84881.c
+++ b/drivers/net/phy/bcm84881.c
@@ -53,7 +53,7 @@ static int bcm84881_config_init(struct phy_device *phydev)
 	switch (phydev->interface) {
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_2500BASEX:
-	case PHY_INTERFACE_MODE_10GKR:
+	case PHY_INTERFACE_MODE_10GBASER:
 		break;
 	default:
 		return -ENODEV;
@@ -218,7 +218,7 @@ static int bcm84881_read_status(struct phy_device *phydev)
 	if (mode == 1 || mode == 2)
 		phydev->interface = PHY_INTERFACE_MODE_SGMII;
 	else if (mode == 3)
-		phydev->interface = PHY_INTERFACE_MODE_10GKR;
+		phydev->interface = PHY_INTERFACE_MODE_10GBASER;
 	else if (mode == 4)
 		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
 	switch (mode & 7) {
diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 512f27b0b5cd..64c9f3bba2cd 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -216,7 +216,7 @@ static int mv3310_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
 	sfp_parse_support(phydev->sfp_bus, id, support);
 	iface = sfp_select_interface(phydev->sfp_bus, support);
 
-	if (iface != PHY_INTERFACE_MODE_10GKR) {
+	if (iface != PHY_INTERFACE_MODE_10GBASER) {
 		dev_err(&phydev->mdio.dev, "incompatible SFP module inserted\n");
 		return -EINVAL;
 	}
@@ -304,7 +304,7 @@ static int mv3310_config_init(struct phy_device *phydev)
 	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
 	    phydev->interface != PHY_INTERFACE_MODE_XAUI &&
 	    phydev->interface != PHY_INTERFACE_MODE_RXAUI &&
-	    phydev->interface != PHY_INTERFACE_MODE_10GKR)
+	    phydev->interface != PHY_INTERFACE_MODE_10GBASER)
 		return -ENODEV;
 
 	return 0;
@@ -386,16 +386,17 @@ static void mv3310_update_interface(struct phy_device *phydev)
 {
 	if ((phydev->interface == PHY_INTERFACE_MODE_SGMII ||
 	     phydev->interface == PHY_INTERFACE_MODE_2500BASEX ||
-	     phydev->interface == PHY_INTERFACE_MODE_10GKR) && phydev->link) {
+	     phydev->interface == PHY_INTERFACE_MODE_10GBASER) &&
+	    phydev->link) {
 		/* The PHY automatically switches its serdes interface (and
-		 * active PHYXS instance) between Cisco SGMII, 10GBase-KR and
+		 * active PHYXS instance) between Cisco SGMII, 10GBase-R and
 		 * 2500BaseX modes according to the speed.  Florian suggests
 		 * setting phydev->interface to communicate this to the MAC.
 		 * Only do this if we are already in one of the above modes.
 		 */
 		switch (phydev->speed) {
 		case SPEED_10000:
-			phydev->interface = PHY_INTERFACE_MODE_10GKR;
+			phydev->interface = PHY_INTERFACE_MODE_10GBASER;
 			break;
 		case SPEED_2500:
 			phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 3f7fa634134a..1edca9725370 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -298,6 +298,7 @@ static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
 			break;
 
 		case PHY_INTERFACE_MODE_10GKR:
+		case PHY_INTERFACE_MODE_10GBASER:
 			phylink_set(pl->supported, 10baseT_Half);
 			phylink_set(pl->supported, 10baseT_Full);
 			phylink_set(pl->supported, 100baseT_Half);
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index 06e6429b8b71..d949ea7b4f8c 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -373,7 +373,7 @@ phy_interface_t sfp_select_interface(struct sfp_bus *bus,
 	    phylink_test(link_modes, 10000baseLRM_Full) ||
 	    phylink_test(link_modes, 10000baseER_Full) ||
 	    phylink_test(link_modes, 10000baseT_Full))
-		return PHY_INTERFACE_MODE_10GKR;
+		return PHY_INTERFACE_MODE_10GBASER;
 
 	if (phylink_test(link_modes, 2500baseX_Full))
 		return PHY_INTERFACE_MODE_2500BASEX;