wireless: Treat IPv6 diffserv the same as IPv4 for 802.11e

Wireless will select a different hardware queue based on the
top 3 bits of the diffserv field, for ipv4. Extend that queue
selection mechanism to ipv6, and make the calls orthogonal.
Signed-off-by: Dave Täht <dave.taht@bufferbloat.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/util.c

@@ -9,6 +9,7 @@
 #include <linux/slab.h>
 #include <net/cfg80211.h>
 #include <net/ip.h>
+#include <net/dsfield.h>
 #include "core.h"
 
 struct ieee80211_rate *
@@ -650,7 +651,10 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 
 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
-		dscp = ip_hdr(skb)->tos & 0xfc;
+		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
+		break;
+	case htons(ETH_P_IPV6):
+		dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 		break;
 	default:
 		return 0;