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[PATCH] loopback: #ifdef the TSO code 

This patch #ifdefs the TSO code in the loopback driver.

Saves ~800 bytes of text on i386 and avoids a conditional in the fast path.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Chuck Ebbert 2005-07-02 21:28:21 -04:00 committed by Jeff Garzik
parent 2f761478a2
commit d2ae1d2ff9
1 changed files with 7 additions and 1 deletions
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8
drivers/net/loopback.c
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@ -68,6 +68,7 @@ static DEFINE_PER_CPU(struct net_device_stats, loopback_stats);
* of largesending device modulo TCP checksum, which is ignored for loopback.
*/
#ifdef LOOPBACK_TSO
static void emulate_large_send_offload(struct sk_buff *skb)
{
struct iphdr *iph = skb->nh.iph;
@ -119,6 +120,7 @@ static void emulate_large_send_offload(struct sk_buff *skb)
dev_kfree_skb(skb);
}
#endif /* LOOPBACK_TSO */
/*
* The higher levels take care of making this non-reentrant (it's
@ -136,6 +138,7 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
skb->ip_summed = CHECKSUM_UNNECESSARY;
#endif
#ifdef LOOPBACK_TSO
if (skb_shinfo(skb)->tso_size) {
BUG_ON(skb->protocol != htons(ETH_P_IP));
BUG_ON(skb->nh.iph->protocol != IPPROTO_TCP);
@ -143,7 +146,7 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
emulate_large_send_offload(skb);
return 0;
}
#endif
dev->last_rx = jiffies;
lb_stats = &per_cpu(loopback_stats, get_cpu());
@ -209,6 +212,9 @@ struct net_device loopback_dev = {
.rebuild_header = eth_rebuild_header,
.flags = IFF_LOOPBACK,
.features = NETIF_F_SG|NETIF_F_FRAGLIST
#ifdef LOOPBACK_TSO
|NETIF_F_TSO
#endif
|NETIF_F_NO_CSUM|NETIF_F_HIGHDMA
|NETIF_F_LLTX,
.ethtool_ops = &loopback_ethtool_ops,