net: phylink: use supported_interfaces for phylink validation

If the network device supplies a supported interface bitmap, we can use
that during phylink's validation to simplify MAC drivers in two ways by
using the supported_interfaces bitmap to:

1. reject unsupported interfaces before calling into the MAC driver.
2. generate the set of all supported link modes across all supported
   interfaces (used mainly for SFP, but also some 10G PHYs.)

Suggested-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 14c7d73790b4..6da245dacca4 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -166,9 +166,45 @@ static const char *phylink_an_mode_str(unsigned int mode)
 	return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 }
 
+static int phylink_validate_any(struct phylink *pl, unsigned long *supported,
+				struct phylink_link_state *state)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(all_adv) = { 0, };
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(all_s) = { 0, };
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(s);
+	struct phylink_link_state t;
+	int intf;
+
+	for (intf = 0; intf < PHY_INTERFACE_MODE_MAX; intf++) {
+		if (test_bit(intf, pl->config->supported_interfaces)) {
+			linkmode_copy(s, supported);
+
+			t = *state;
+			t.interface = intf;
+			pl->mac_ops->validate(pl->config, s, &t);
+			linkmode_or(all_s, all_s, s);
+			linkmode_or(all_adv, all_adv, t.advertising);
+		}
+	}
+
+	linkmode_copy(supported, all_s);
+	linkmode_copy(state->advertising, all_adv);
+
+	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
+}
+
 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 			    struct phylink_link_state *state)
 {
+	if (!phy_interface_empty(pl->config->supported_interfaces)) {
+		if (state->interface == PHY_INTERFACE_MODE_NA)
+			return phylink_validate_any(pl, supported, state);
+
+		if (!test_bit(state->interface,
+			      pl->config->supported_interfaces))
+			return -EINVAL;
+	}
+
 	pl->mac_ops->validate(pl->config, supported, state);
 
 	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;