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
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219d54332a
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21187fcd08
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@ -1022,6 +1022,7 @@ void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt);
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void skb_tx_error(struct sk_buff *skb);
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void skb_tx_error(struct sk_buff *skb);
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void consume_skb(struct sk_buff *skb);
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void consume_skb(struct sk_buff *skb);
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void __consume_stateless_skb(struct sk_buff *skb);
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void __consume_stateless_skb(struct sk_buff *skb);
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void skb_recycle(struct sk_buff *skb);
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void __kfree_skb(struct sk_buff *skb);
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void __kfree_skb(struct sk_buff *skb);
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extern struct kmem_cache *skbuff_head_cache;
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extern struct kmem_cache *skbuff_head_cache;
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@ -919,6 +919,32 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
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}
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}
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EXPORT_SYMBOL(napi_consume_skb);
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EXPORT_SYMBOL(napi_consume_skb);
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/**
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* skb_recycle - clean up an skb for reuse
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* @skb: buffer
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*
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* Recycles the skb to be reused as a receive buffer. This
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* function does any necessary reference count dropping, and
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* cleans up the skbuff as if it just came from __alloc_skb().
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*/
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void skb_recycle(struct sk_buff *skb)
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{
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struct skb_shared_info *shinfo;
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u8 head_frag = skb->head_frag;
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skb_release_head_state(skb);
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shinfo = skb_shinfo(skb);
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memset(shinfo, 0, offsetof(struct skb_shared_info, dataref));
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atomic_set(&shinfo->dataref, 1);
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memset(skb, 0, offsetof(struct sk_buff, tail));
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skb->data = skb->head + NET_SKB_PAD;
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skb->head_frag = head_frag;
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skb_reset_tail_pointer(skb);
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}
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EXPORT_SYMBOL(skb_recycle);
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/* Make sure a field is enclosed inside headers_start/headers_end section */
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/* Make sure a field is enclosed inside headers_start/headers_end section */
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#define CHECK_SKB_FIELD(field) \
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#define CHECK_SKB_FIELD(field) \
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BUILD_BUG_ON(offsetof(struct sk_buff, field) < \
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BUILD_BUG_ON(offsetof(struct sk_buff, field) < \
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