gro: New frags interface to avoid copying shinfo
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>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2e7783f..54db3eb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1047,14 +1047,6 @@
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 @@
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 *);