net: ftmac100: handle netdev flags IFF_PROMISC and IFF_ALLMULTI

When netdev->flags has IFF_PROMISC or IFF_ALLMULTI, set the
corresponding bits in the MAC Control Register (MACCR).

This change is based on code from the ftgmac100 driver, see
ftgmac100_start_hw() in ftgmac100.c
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/faraday/ftmac100.c

@@ -182,6 +182,12 @@ static int ftmac100_start_hw(struct ftmac100 *priv)
 	if (netdev->mtu > ETH_DATA_LEN)
 		maccr |= FTMAC100_MACCR_RX_FTL;
 
+	/* Add other bits as needed */
+	if (netdev->flags & IFF_PROMISC)
+		maccr |= FTMAC100_MACCR_RCV_ALL;
+	if (netdev->flags & IFF_ALLMULTI)
+		maccr |= FTMAC100_MACCR_RX_MULTIPKT;
+
 	iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR);
 	return 0;
 }