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gro: New frags interface to avoid copying shinfo

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It turns out that copying a 16-byte area at ~800k times a second
can be really expensive :) This patch redesigns the frags GRO
interface to avoid copying that area twice.

The two disciples of the frags interface have been converted.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2009-04-16 02:02:07 -07:00
committed by David S. Miller
parent 861ab44059
commit 76620aafd6
7 changed files with 102 additions and 94 deletions
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22
include/linux/netdevice.h
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@ -1047,14 +1047,6 @@ struct packet_type {
struct list_head list;
};
struct napi_gro_fraginfo {
skb_frag_t frags[MAX_SKB_FRAGS];
unsigned int nr_frags;
unsigned int ip_summed;
unsigned int len;
__wsum csum;
};
#include <linux/interrupt.h>
#include <linux/notifier.h>
@ -1442,12 +1434,18 @@ extern int napi_gro_receive(struct napi_struct *napi,
struct sk_buff *skb);
extern void napi_reuse_skb(struct napi_struct *napi,
struct sk_buff *skb);
extern struct sk_buff * napi_fraginfo_skb(struct napi_struct *napi,
struct napi_gro_fraginfo *info);
extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
extern int napi_frags_finish(struct napi_struct *napi,
struct sk_buff *skb, int ret);
extern int napi_gro_frags(struct napi_struct *napi,
struct napi_gro_fraginfo *info);
extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
extern int napi_gro_frags(struct napi_struct *napi);
static inline void napi_free_frags(struct napi_struct *napi)
{
kfree_skb(napi->skb);
napi->skb = NULL;
}
extern void netif_nit_deliver(struct sk_buff *skb);
extern int dev_valid_name(const char *name);
extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);