net: introduce IFF_UNICAST_FLT private flag

Use IFF_UNICAST_FTL to find out if driver handles unicast address
filtering. In case it does not, promisc mode is entered.

Patch also fixes following drivers:
stmmac, niu: support uc filtering and yet it propagated
	ndo_set_multicast_list
bna, benet, pxa168_eth, ks8851, ks8851_mll, ksz884x : has set
	ndo_set_rx_mode but do not support uc filtering

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/if.h b/include/linux/if.h
index 03489ca92ded..db20bd4fd16b 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -78,6 +78,7 @@
                                          * datapath port */
 #define IFF_TX_SKB_SHARING      0x10000 /* The interface supports sharing
                                          * skbs on transmit */
+#define IFF_UNICAST_FLT 0x20000         /* Supports unicast filtering   */
 
 #define IF_GET_IFACE    0x0001          /* for querying only */
 #define IF_GET_PROTO    0x0002
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ddee79bb8f15..96e4f7e0ad68 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -723,6 +723,8 @@ struct netdev_tc_txq {
  *
  * void (*ndo_set_rx_mode)(struct net_device *dev);
  *      This function is called device changes address list filtering.
+ *      If driver handles unicast address filtering, it should set
+ *      IFF_UNICAST_FLT to its priv_flags.
  *
  * void (*ndo_set_multicast_list)(struct net_device *dev);
  *      This function is called when the multicast address list changes.