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net: add alloc_skb_with_frags() helper

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Extract from sock_alloc_send_pskb() code building skb with frags,
so that we can reuse this in other contexts.

Intent is to use it from tcp_send_rcvq(), tcp_collapse(), ...

We also want to replace some skb_linearize() calls to a more reliable
strategy in pathological cases where we need to reduce number of frags.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-09-17 04:49:49 -07:00 • committed by David S. Miller
commit 2e4e441071
3 changed files with 99 additions and 63 deletions
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6
include/linux/skbuff.h
View file

@ -769,6 +769,12 @@ static inline struct sk_buff *alloc_skb(unsigned int size,
return __alloc_skb(size, priority, 0, NUMA_NO_NODE);
}
struct sk_buff *alloc_skb_with_frags(unsigned long header_len,
unsigned long data_len,
int max_page_order,
int *errcode,
gfp_t gfp_mask);
static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
gfp_t priority)
{