net: dsa: add hook to determine whether EEE is supported

Add a hook to determine whether the switch supports EEE. This will
return false if the switch does not, or true if it does. If the
method is not implemented, we assume (currently) that the switch
supports EEE.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://patch.msgid.link/E1tL144-006cZD-El@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 72ae65e..aaa75bb 100644 (file)
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -988,6 +988,7 @@ struct dsa_switch_ops {
        /*
         * Port's MAC EEE settings
         */
+       bool    (*support_eee)(struct dsa_switch *ds, int port);
        int     (*set_mac_eee)(struct dsa_switch *ds, int port,
                               struct ethtool_keee *e);
        int     (*get_mac_eee)(struct dsa_switch *ds, int port,

diff --git a/net/dsa/user.c b/net/dsa/user.c
index e1a0b15..a743396 100644 (file)
--- a/net/dsa/user.c
+++ b/net/dsa/user.c
@@ -1229,6 +1229,10 @@ static int dsa_user_set_eee(struct net_device *dev, struct ethtool_keee *e)
        struct dsa_switch *ds = dp->ds;
        int ret;
 
+       /* Check whether the switch supports EEE */
+       if (ds->ops->support_eee && !ds->ops->support_eee(ds, dp->index))
+               return -EOPNOTSUPP;
+
        /* Port's PHY and MAC both need to be EEE capable */
        if (!dev->phydev)
                return -ENODEV;
@@ -1249,6 +1253,10 @@ static int dsa_user_get_eee(struct net_device *dev, struct ethtool_keee *e)
        struct dsa_switch *ds = dp->ds;
        int ret;
 
+       /* Check whether the switch supports EEE */
+       if (ds->ops->support_eee && !ds->ops->support_eee(ds, dp->index))
+               return -EOPNOTSUPP;
+
        /* Port's PHY and MAC both need to be EEE capable */
        if (!dev->phydev)
                return -ENODEV;