net: dsa: allow enabling and disable switch ports

Whenever a per-port network device is used/unused, invoke the switch
driver port_enable/port_disable callbacks to allow saving as much power
as possible by disabling unused parts of the switch (RX/TX logic, memory
arrays, PHYs...). We supply a PHY device argument to make sure the
switch driver can act on the PHY device if needed (like putting/taking
the PHY out of deep low power mode).

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 4392e983abda..182d30ae6818 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -62,6 +62,7 @@ static int dsa_slave_open(struct net_device *dev)
 {
         struct dsa_slave_priv *p = netdev_priv(dev);
         struct net_device *master = p->parent->dst->master_netdev;
+        struct dsa_switch *ds = p->parent;
         int err;
 
         if (!(master->flags & IFF_UP))
@@ -84,11 +85,20 @@ static int dsa_slave_open(struct net_device *dev)
                         goto clear_allmulti;
         }
 
+        if (ds->drv->port_enable) {
+                err = ds->drv->port_enable(ds, p->port, p->phy);
+                if (err)
+                        goto clear_promisc;
+        }
+
         if (p->phy)
                 phy_start(p->phy);
 
         return 0;
 
+clear_promisc:
+        if (dev->flags & IFF_PROMISC)
+                dev_set_promiscuity(master, 0);
 clear_allmulti:
         if (dev->flags & IFF_ALLMULTI)
                 dev_set_allmulti(master, -1);
@@ -103,6 +113,7 @@ static int dsa_slave_close(struct net_device *dev)
 {
         struct dsa_slave_priv *p = netdev_priv(dev);
         struct net_device *master = p->parent->dst->master_netdev;
+        struct dsa_switch *ds = p->parent;
 
         if (p->phy)
                 phy_stop(p->phy);
@@ -117,6 +128,9 @@ static int dsa_slave_close(struct net_device *dev)
         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
                 dev_uc_del(master, dev->dev_addr);
 
+        if (ds->drv->port_disable)
+                ds->drv->port_disable(ds, p->port, p->phy);
+
         return 0;
 }