qeth: core code should alloc headroom for LLC protocol

Allocate headroom for TR_HLEN but using only ETH_HLEN causes rx
performance degradation. Allocate ETH_HLEN for ethernet and
TR_HLEN for token ring (layer 3 mode).

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

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 5cfe0ef..055f5c3 100644 (file)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4002,7 +4002,11 @@ struct sk_buff *qeth_core_get_next_skb(struct qeth_card *card,
                }
        } else {
                skb_len = (*hdr)->hdr.l3.length;
-               headroom = max((int)ETH_HLEN, (int)TR_HLEN);
+               if ((card->info.link_type == QETH_LINK_TYPE_LANE_TR) ||
+                   (card->info.link_type == QETH_LINK_TYPE_HSTR))
+                       headroom = TR_HLEN;
+               else
+                       headroom = ETH_HLEN;
        }
 
        if (!skb_len)