forcedeth: use unicast receive mode for WoL

I happened to notice that a system with an NVidia NIC using the
forcedeth driver won't wake-on-LAN if the interface was in promiscuous
mode when you power off. By experiment, it looks like
the hardware needs to have NvRegPacketFilterFlags set to
NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR (i.e., receive unicast packets to my
address) in order for WoL to work.

Jeff Garzik writes: "NVIDIA says the patch looks OK." I didn't venture
to insert a signed-off-by line with his name on it, though.

Signed-off-by: Tim Mann <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/forcedeth.c

···
 
 	drain_ring(dev);
 
-	if (np->wolenabled)
+	if (np->wolenabled) {
+		writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags);
 		nv_start_rx(dev);
+	}
 
 	/* FIXME: power down nic */