net: dsa: Pass stringset to ethtool operations

Up until now we largely assumed that we were interested in ETH_SS_STATS
type of strings for all ethtool operations, this is about to change with
the introduction of additional string sets, e.g: ETH_SS_PHY_STATS.
Update all functions to take an appropriate stringset argument and act
on it when it is different than ETH_SS_STATS for now.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c
index f77be9f..9354cc0 100644
--- a/drivers/net/dsa/dsa_loop.c
+++ b/drivers/net/dsa/dsa_loop.c
@@ -86,16 +86,23 @@
 	return 0;
 }
 
-static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port)
+static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
 {
+	if (sset != ETH_SS_STATS)
+		return 0;
+
 	return __DSA_LOOP_CNT_MAX;
 }
 
-static void dsa_loop_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
+static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
+				 u32 stringset, uint8_t *data)
 {
 	struct dsa_loop_priv *ps = ds->priv;
 	unsigned int i;
 
+	if (stringset != ETH_SS_STATS)
+		return;
+
 	for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 		memcpy(data + i * ETH_GSTRING_LEN,
 		       ps->ports[port].mib[i].name, ETH_GSTRING_LEN);