net: phylink: add phylink_pcs_inband()

Add phylink_pcs_inband() to indicate whether the PCS should be using
inband signalling.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 51605b1468a3..4e367de691d4 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -51,6 +51,25 @@ static inline bool phylink_autoneg_inband(unsigned int mode)
 }
 
 /**
+ * phylink_pcs_inband() - helper to indicate whether to enable inband signalling
+ * @mode: one of %MLO_AN_FIXED, %MLO_AN_PHY, %MLO_AN_INBAND.
+ * @interface: interface mode to be used
+ * @advertising: adertisement ethtool link mode mask
+ *
+ * Returns true if the mode/interface/advertising mask indicates that we
+ * should be using inband signalling at the PCS block, false otherwise.
+ */
+static inline bool phylink_pcs_inband(unsigned int mode,
+				      phy_interface_t interface,
+				      const unsigned long *advertising)
+{
+	return phylink_autoneg_inband(mode) &&
+	       (interface == PHY_INTERFACE_MODE_SGMII ||
+	        interface == PHY_INTERFACE_MODE_QSGMII ||
+	        linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, advertising));
+}
+
+/**
  * struct phylink_link_state - link state structure
  * @advertising: ethtool bitmask containing advertised link modes
  * @lp_advertising: ethtool bitmask containing link partner advertised link