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net: readd skb_recycle() 

Adding back skb_recycle() as it's used by the DPAA Ethernet driver.
This was removed from the upstream kernel because it was lacking users.

Signed-off-by: Madalin Bucur <madalin.bucur@freescale.com>
5.4-rM2-2.2.x-imx-squashed
Madalin Bucur 2016-01-05 12:12:07 +02:00 committed by Dong Aisheng
parent 219d54332a
commit 21187fcd08
2 changed files with 27 additions and 0 deletions
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1
include/linux/skbuff.h
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@ -1022,6 +1022,7 @@ void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt);
void skb_tx_error(struct sk_buff *skb);
void consume_skb(struct sk_buff *skb);
void __consume_stateless_skb(struct sk_buff *skb);
void skb_recycle(struct sk_buff *skb);
void __kfree_skb(struct sk_buff *skb);
extern struct kmem_cache *skbuff_head_cache;

26
net/core/skbuff.c
View File

@ -919,6 +919,32 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
}
EXPORT_SYMBOL(napi_consume_skb);
/**
* skb_recycle - clean up an skb for reuse
* @skb: buffer
*
* Recycles the skb to be reused as a receive buffer. This
* function does any necessary reference count dropping, and
* cleans up the skbuff as if it just came from __alloc_skb().
*/
void skb_recycle(struct sk_buff *skb)
{
struct skb_shared_info *shinfo;
u8 head_frag = skb->head_frag;
skb_release_head_state(skb);
shinfo = skb_shinfo(skb);
memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
atomic_set(&shinfo->dataref, 1);
memset(skb, 0, offsetof(struct sk_buff, tail));
skb->data = skb->head + NET_SKB_PAD;
skb->head_frag = head_frag;
skb_reset_tail_pointer(skb);
}
EXPORT_SYMBOL(skb_recycle);
/* Make sure a field is enclosed inside headers_start/headers_end section */
#define CHECK_SKB_FIELD(field) \
BUILD_BUG_ON(offsetof(struct sk_buff, field) < \