[802.11] Support multicast hashing

802.11 multicast hashing is the same as standard Ethernet hashing, so
just expose and use eth_mc_hash().

Signed-off-by: Joshua Oreman <oremanj@rwcr.net>

src/include/gpxe/ethernet.h

@@ -13,6 +13,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 extern void eth_init_addr ( const void *hw_addr, void *ll_addr );
 extern const char * eth_ntoa ( const void *ll_addr );
+extern int eth_mc_hash ( unsigned int af, const void *net_addr,
+			 void *ll_addr );
 extern struct net_device * alloc_etherdev ( size_t priv_size );
 
 #endif /* _GPXE_ETHERNET_H */

src/net/80211/net80211.c

@@ -160,8 +160,6 @@ static int net80211_ll_push ( struct net_device *netdev,
 static int net80211_ll_pull ( struct net_device *netdev,
 			      struct io_buffer *iobuf, const void **ll_dest,
 			      const void **ll_source, uint16_t * net_proto );
-static int net80211_ll_mc_hash ( unsigned int af, const void *net_addr,
-				 void *ll_addr );
 /** @} */
 
 /**
@@ -580,23 +578,6 @@ static int net80211_ll_pull ( struct net_device *netdev __unused,
 	return 0;
 }
 
-/**
- * Hash 802.11 multicast address
- *
- * @v af	Address family
- * @v net_addr	Network-layer address
- * @ret ll_addr	Filled link-layer address
- * @ret rc	Return status code
- *
- * Currently unimplemented.
- */
-static int net80211_ll_mc_hash ( unsigned int af __unused,
-				 const void *net_addr __unused,
-				 void *ll_addr __unused )
-{
-	return -ENOTSUP;
-}
-
 /** 802.11 link-layer protocol */
 static struct ll_protocol net80211_ll_protocol __ll_protocol = {
 	.name = "802.11",
@@ -604,7 +585,7 @@ static struct ll_protocol net80211_ll_protocol __ll_protocol = {
 	.pull = net80211_ll_pull,
 	.init_addr = eth_init_addr,
 	.ntoa = eth_ntoa,
-	.mc_hash = net80211_ll_mc_hash,
+	.mc_hash = eth_mc_hash,
 	.ll_proto = htons ( ARPHRD_ETHER ),	/* "encapsulated Ethernet" */
 	.hw_addr_len = ETH_ALEN,
 	.ll_addr_len = ETH_ALEN,

src/net/ethernet.c

@@ -130,8 +130,7 @@ const char * eth_ntoa ( const void *ll_addr ) {
  * @v ll_addr		Link-layer address to fill in
  * @ret rc		Return status code
  */
-static int eth_mc_hash ( unsigned int af, const void *net_addr,
-			 void *ll_addr ) {
+int eth_mc_hash ( unsigned int af, const void *net_addr, void *ll_addr ) {
 	const uint8_t *net_addr_bytes = net_addr;
 	uint8_t *ll_addr_bytes = ll_addr;