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net: Add skb_free_frag to replace use of put_page in freeing skb->head 

This change adds a function called skb_free_frag which is meant to
compliment the function netdev_alloc_frag.  The general idea is to enable a
more lightweight version of page freeing since we don't actually need all
the overhead of a put_page, and we don't quite fit the model of __free_pages.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2015-05-06 21:12:03 -07:00 committed by David S. Miller
parent b63ae8ca09
commit 181edb2bfa
2 changed files with 11 additions and 4 deletions
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5
include/linux/skbuff.h
View File

@ -2182,6 +2182,11 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC);
}
static inline void skb_free_frag(void *addr)
{
__free_page_frag(addr);
}
void *napi_alloc_frag(unsigned int fragsz);
struct sk_buff *__napi_alloc_skb(struct napi_struct *napi,
unsigned int length, gfp_t gfp_mask);

10
net/core/skbuff.c
View File

@ -436,7 +436,7 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
skb = __build_skb(data, len);
if (unlikely(!skb)) {
put_page(virt_to_head_page(data));
skb_free_frag(data);
return NULL;
}
@ -490,7 +490,7 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
skb = __build_skb(data, len);
if (unlikely(!skb)) {
put_page(virt_to_head_page(data));
skb_free_frag(data);
return NULL;
}
@ -549,10 +549,12 @@ static void skb_clone_fraglist(struct sk_buff *skb)
static void skb_free_head(struct sk_buff *skb)
{
unsigned char *head = skb->head;
if (skb->head_frag)
put_page(virt_to_head_page(skb->head));
skb_free_frag(head);
else
kfree(skb->head);
kfree(head);
}
static void skb_release_data(struct sk_buff *skb)