dsa: set ->iflink on slave interfaces to the ifindex of the parent

..so that we can parse the DSA topology from 'ip link' output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
4: lan1@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
5: lan2@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
6: lan3@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
7: lan4@eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index a68fd79e9eca..99114e5b32e4 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -48,6 +48,16 @@ void dsa_slave_mii_bus_init(struct dsa_switch *ds)
 
 
 /* slave device handling ****************************************************/
+static int dsa_slave_init(struct net_device *dev)
+{
+        struct dsa_slave_priv *p = netdev_priv(dev);
+        struct net_device *master = p->parent->master_netdev;
+
+        dev->iflink = master->ifindex;
+
+        return 0;
+}
+
 static int dsa_slave_open(struct net_device *dev)
 {
         struct dsa_slave_priv *p = netdev_priv(dev);
@@ -288,6 +298,7 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
 
 #ifdef CONFIG_NET_DSA_TAG_DSA
 static const struct net_device_ops dsa_netdev_ops = {
+        .ndo_init               = dsa_slave_init,
         .ndo_open               = dsa_slave_open,
         .ndo_stop               = dsa_slave_close,
         .ndo_start_xmit         = dsa_xmit,
@@ -300,6 +311,7 @@ static const struct net_device_ops dsa_netdev_ops = {
 #endif
 #ifdef CONFIG_NET_DSA_TAG_EDSA
 static const struct net_device_ops edsa_netdev_ops = {
+        .ndo_init               = dsa_slave_init,
         .ndo_open               = dsa_slave_open,
         .ndo_stop               = dsa_slave_close,
         .ndo_start_xmit         = edsa_xmit,
@@ -312,6 +324,7 @@ static const struct net_device_ops edsa_netdev_ops = {
 #endif
 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 static const struct net_device_ops trailer_netdev_ops = {
+        .ndo_init               = dsa_slave_init,
         .ndo_open               = dsa_slave_open,
         .ndo_stop               = dsa_slave_close,
         .ndo_start_xmit         = trailer_xmit,