[PATCH net-next v5 13/13] net: phylink: Use phy_caps to get an interface's capabilities and modes

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

Phylink has internal code to get the MAC capabilities of a given PHY
interface (what are the supported speed and duplex).

Extract that into phy_caps, but use the link_capa for conversion. Add an
internal phylink helper for the link caps -> mac caps conversion, and
use this in phylink_caps_to_linkmodes().

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
V5: Rename the patch with the phylink prefix

 drivers/net/phy/phy-caps.h |  4 ++
 drivers/net/phy/phy_caps.c | 92 ++++++++++++++++++++++++++++++++++++++
 drivers/net/phy/phylink.c  | 90 ++++++-------------------------------
 3 files changed, 110 insertions(+), 76 deletions(-)

diff --git a/drivers/net/phy/phy-caps.h b/drivers/net/phy/phy-caps.h
index 7fc930876e33..157759966650 100644
--- a/drivers/net/phy/phy-caps.h
+++ b/drivers/net/phy/phy-caps.h
@@ -8,6 +8,7 @@
 #define __PHY_CAPS_H
 
 #include <linux/ethtool.h>
+#include <linux/phy.h>
 
 enum {
 	LINK_CAPA_10HD = 0,
@@ -32,6 +33,8 @@ enum {
 	__LINK_CAPA_MAX,
 };
 
+#define LINK_CAPA_ALL	GENMASK((__LINK_CAPA_MAX - 1), 0)
+
 struct link_capabilities {
 	int speed;
 	unsigned int duplex;
@@ -45,6 +48,7 @@ size_t phy_caps_speeds(unsigned int *speeds, size_t size,
 void phy_caps_linkmode_max_speed(u32 max_speed, unsigned long *linkmodes);
 bool phy_caps_valid(int speed, int duplex, const unsigned long *linkmodes);
 void phy_caps_linkmodes(unsigned long caps, unsigned long *linkmodes);
+unsigned long phy_caps_from_interface(phy_interface_t interface);
 
 const struct link_capabilities *
 phy_caps_lookup_by_linkmode(const unsigned long *linkmodes);
diff --git a/drivers/net/phy/phy_caps.c b/drivers/net/phy/phy_caps.c
index fc1568f83c1a..703321689726 100644
--- a/drivers/net/phy/phy_caps.c
+++ b/drivers/net/phy/phy_caps.c
@@ -265,3 +265,95 @@ void phy_caps_linkmodes(unsigned long caps, unsigned long *linkmodes)
 		linkmode_or(linkmodes, linkmodes, link_caps[capa].linkmodes);
 }
 EXPORT_SYMBOL_GPL(phy_caps_linkmodes);
+
+/**
+ * phy_caps_from_interface() - Get the link capa from a given PHY interface
+ * @interface: The PHY interface we want to get the possible Speed/Duplex from
+ *
+ * Returns: A bitmask of LINK_CAPA_xxx values that can be achieved with the
+ *          provided interface.
+ */
+unsigned long phy_caps_from_interface(phy_interface_t interface)
+{
+	unsigned long link_caps = 0;
+
+	switch (interface) {
+	case PHY_INTERFACE_MODE_USXGMII:
+		link_caps |= BIT(LINK_CAPA_10000FD) | BIT(LINK_CAPA_5000FD);
+		fallthrough;
+
+	case PHY_INTERFACE_MODE_10G_QXGMII:
+		link_caps |= BIT(LINK_CAPA_2500FD);
+		fallthrough;
+
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_PSGMII:
+	case PHY_INTERFACE_MODE_QSGMII:
+	case PHY_INTERFACE_MODE_QUSGMII:
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_GMII:
+		link_caps |= BIT(LINK_CAPA_1000HD) | BIT(LINK_CAPA_1000FD);
+		fallthrough;
+
+	case PHY_INTERFACE_MODE_REVRMII:
+	case PHY_INTERFACE_MODE_RMII:
+	case PHY_INTERFACE_MODE_SMII:
+	case PHY_INTERFACE_MODE_REVMII:
+	case PHY_INTERFACE_MODE_MII:
+		link_caps |= BIT(LINK_CAPA_10HD) | BIT(LINK_CAPA_10FD);
+		fallthrough;
+
+	case PHY_INTERFACE_MODE_100BASEX:
+		link_caps |= BIT(LINK_CAPA_100HD) | BIT(LINK_CAPA_100FD);
+		break;
+
+	case PHY_INTERFACE_MODE_TBI:
+	case PHY_INTERFACE_MODE_MOCA:
+	case PHY_INTERFACE_MODE_RTBI:
+	case PHY_INTERFACE_MODE_1000BASEX:
+		link_caps |= BIT(LINK_CAPA_1000HD);
+		fallthrough;
+	case PHY_INTERFACE_MODE_1000BASEKX:
+	case PHY_INTERFACE_MODE_TRGMII:
+		link_caps |= BIT(LINK_CAPA_1000FD);
+		break;
+
+	case PHY_INTERFACE_MODE_2500BASEX:
+		link_caps |= BIT(LINK_CAPA_2500FD);
+		break;
+
+	case PHY_INTERFACE_MODE_5GBASER:
+		link_caps |= BIT(LINK_CAPA_5000FD);
+		break;
+
+	case PHY_INTERFACE_MODE_XGMII:
+	case PHY_INTERFACE_MODE_RXAUI:
+	case PHY_INTERFACE_MODE_XAUI:
+	case PHY_INTERFACE_MODE_10GBASER:
+	case PHY_INTERFACE_MODE_10GKR:
+		link_caps |= BIT(LINK_CAPA_10000FD);
+		break;
+
+	case PHY_INTERFACE_MODE_25GBASER:
+		link_caps |= BIT(LINK_CAPA_25000FD);
+		break;
+
+	case PHY_INTERFACE_MODE_XLGMII:
+		link_caps |= BIT(LINK_CAPA_40000FD);
+		break;
+
+	case PHY_INTERFACE_MODE_INTERNAL:
+		link_caps |= LINK_CAPA_ALL;
+		break;
+
+	case PHY_INTERFACE_MODE_NA:
+	case PHY_INTERFACE_MODE_MAX:
+		break;
+	}
+
+	return link_caps;
+}
+EXPORT_SYMBOL_GPL(phy_caps_from_interface);
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index a75aad5e4563..08a2f0f7c08e 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -335,6 +335,18 @@ static unsigned long phylink_caps_to_link_caps(unsigned long caps)
 	return link_caps;
 }
 
+static unsigned long phylink_link_caps_to_mac_caps(unsigned long link_caps)
+{
+	unsigned long caps = 0;
+	int i;
+
+	for (i = 0; i <  ARRAY_SIZE(phylink_caps_params); i++)
+		if (link_caps & phylink_caps_params[i].caps_bit)
+			caps |= phylink_caps_params[i].mask;
+
+	return caps;
+}
+
 /**
  * phylink_caps_to_linkmodes() - Convert capabilities to ethtool link modes
  * @linkmodes: ethtool linkmode mask (must be already initialised)
@@ -412,86 +424,12 @@ static unsigned long phylink_get_capabilities(phy_interface_t interface,
 					      unsigned long mac_capabilities,
 					      int rate_matching)
 {
+	unsigned long link_caps = phy_caps_from_interface(interface);
 	int max_speed = phylink_interface_max_speed(interface);
 	unsigned long caps = MAC_SYM_PAUSE | MAC_ASYM_PAUSE;
 	unsigned long matched_caps = 0;
 
-	switch (interface) {
-	case PHY_INTERFACE_MODE_USXGMII:
-		caps |= MAC_10000FD | MAC_5000FD;
-		fallthrough;
-
-	case PHY_INTERFACE_MODE_10G_QXGMII:
-		caps |= MAC_2500FD;
-		fallthrough;
-
-	case PHY_INTERFACE_MODE_RGMII_TXID:
-	case PHY_INTERFACE_MODE_RGMII_RXID:
-	case PHY_INTERFACE_MODE_RGMII_ID:
-	case PHY_INTERFACE_MODE_RGMII:
-	case PHY_INTERFACE_MODE_PSGMII:
-	case PHY_INTERFACE_MODE_QSGMII:
-	case PHY_INTERFACE_MODE_QUSGMII:
-	case PHY_INTERFACE_MODE_SGMII:
-	case PHY_INTERFACE_MODE_GMII:
-		caps |= MAC_1000HD | MAC_1000FD;
-		fallthrough;
-
-	case PHY_INTERFACE_MODE_REVRMII:
-	case PHY_INTERFACE_MODE_RMII:
-	case PHY_INTERFACE_MODE_SMII:
-	case PHY_INTERFACE_MODE_REVMII:
-	case PHY_INTERFACE_MODE_MII:
-		caps |= MAC_10HD | MAC_10FD;
-		fallthrough;
-
-	case PHY_INTERFACE_MODE_100BASEX:
-		caps |= MAC_100HD | MAC_100FD;
-		break;
-
-	case PHY_INTERFACE_MODE_TBI:
-	case PHY_INTERFACE_MODE_MOCA:
-	case PHY_INTERFACE_MODE_RTBI:
-	case PHY_INTERFACE_MODE_1000BASEX:
-		caps |= MAC_1000HD;
-		fallthrough;
-	case PHY_INTERFACE_MODE_1000BASEKX:
-	case PHY_INTERFACE_MODE_TRGMII:
-		caps |= MAC_1000FD;
-		break;
-
-	case PHY_INTERFACE_MODE_2500BASEX:
-		caps |= MAC_2500FD;
-		break;
-
-	case PHY_INTERFACE_MODE_5GBASER:
-		caps |= MAC_5000FD;
-		break;
-
-	case PHY_INTERFACE_MODE_XGMII:
-	case PHY_INTERFACE_MODE_RXAUI:
-	case PHY_INTERFACE_MODE_XAUI:
-	case PHY_INTERFACE_MODE_10GBASER:
-	case PHY_INTERFACE_MODE_10GKR:
-		caps |= MAC_10000FD;
-		break;
-
-	case PHY_INTERFACE_MODE_25GBASER:
-		caps |= MAC_25000FD;
-		break;
-
-	case PHY_INTERFACE_MODE_XLGMII:
-		caps |= MAC_40000FD;
-		break;
-
-	case PHY_INTERFACE_MODE_INTERNAL:
-		caps |= ~0;
-		break;
-
-	case PHY_INTERFACE_MODE_NA:
-	case PHY_INTERFACE_MODE_MAX:
-		break;
-	}
+	caps |= phylink_link_caps_to_mac_caps(link_caps);
 
 	switch (rate_matching) {
 	case RATE_MATCH_OPEN_LOOP:
-- 
2.48.1