ixp4xx: Support the all multicast flag on the NPE devices.

This patch adds support for the IFF_ALLMULTI flag. Previously only the
IFF_PROMISC flag was supported.
Signed-off-by: NRichard Cochran <richard.cochran@omicron.at>
Acked-By: NKrzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/arm/ixp4xx_eth.c

@@ -738,6 +738,17 @@ static void eth_set_mcast_list(struct net_device *dev)
 	struct netdev_hw_addr *ha;
 	u8 diffs[ETH_ALEN], *addr;
 	int i;
+	static const u8 allmulti[] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+	if (dev->flags & IFF_ALLMULTI) {
+		for (i = 0; i < ETH_ALEN; i++) {
+			__raw_writel(allmulti[i], &port->regs->mcast_addr[i]);
+			__raw_writel(allmulti[i], &port->regs->mcast_mask[i]);
+		}
+		__raw_writel(DEFAULT_RX_CNTRL0 | RX_CNTRL0_ADDR_FLTR_EN,
+			&port->regs->rx_control[0]);
+		return;
+	}
 
 	if ((dev->flags & IFF_PROMISC) || netdev_mc_empty(dev)) {
 		__raw_writel(DEFAULT_RX_CNTRL0 & ~RX_CNTRL0_ADDR_FLTR_EN,