net: bridge: remove _deliver functions and consolidate forward code

Before this patch we had two flavors of most forwarding functions -
_forward and _deliver, the difference being that the latter are used
when the packets are locally originated. Instead of all this function
pointer passing and code duplication, we can just pass a boolean noting
that the packet was locally originated and use that to perform the
necessary checks in __br_forward. This gives a minor performance
improvement but more importantly consolidates the forwarding paths.
Also add a kernel doc comment to explain the exported br_forward()'s
arguments.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index dd8885d..8b08eec 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -189,12 +189,12 @@
 
 	if (dst) {
 		dst->used = jiffies;
-		br_forward(dst->dst, skb, local_rcv);
+		br_forward(dst->dst, skb, local_rcv, false);
 	} else {
 		if (!mcast_hit)
-			br_flood_forward(br, skb, local_rcv, unicast);
+			br_flood(br, skb, unicast, local_rcv, false);
 		else
-			br_multicast_forward(mdst, skb, local_rcv);
+			br_multicast_flood(mdst, skb, local_rcv, false);
 	}
 
 	if (local_rcv)