Commit d2ae1d2f authored by Chuck Ebbert's avatar Chuck Ebbert Committed by Jeff Garzik
Browse files

[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: default avatarChuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 2f761478

drivers/net/loopback.c

+7 −1
Original line number Diff line number Diff line
@@ -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,