qeth: CCL-sequence numbers required for protocol ETH_P_802_2 only

Symptom:     slow CCL response time
Problem:     non-ETH_P_802_2 packets are not delivered to NDH for
             CCL. But CCL detects missing sequence numbers, which
             cause a serious performance problem with CCL.
Solution:    assign sequence numbers only to 802.2 packets.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/s390/net/qeth_l2_main.c

@@ -451,7 +451,8 @@ static void qeth_l2_process_inbound_buffer(struct qeth_card *card,
 				skb->ip_summed = CHECKSUM_UNNECESSARY;
 			else
 				skb->ip_summed = CHECKSUM_NONE;
-			*((__u32 *)skb->cb) = ++card->seqno.pkt_seqno;
+			if (skb->protocol == htons(ETH_P_802_2))
+				*((__u32 *)skb->cb) = ++card->seqno.pkt_seqno;
 			len = skb->len;
 			netif_rx(skb);
 			break;