diff options
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index fe008f1..2684c49 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -825,6 +825,32 @@ 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) < \ @@ -1056,7 +1082,7 @@ static void skb_headers_offset_update(struct sk_buff *skb, int off) skb->inner_mac_header += off; } -static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old) +void copy_skb_header(struct sk_buff *new, const struct sk_buff *old) { __copy_skb_header(new, old); @@ -1064,6 +1090,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old) skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs; skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type; } +EXPORT_SYMBOL(copy_skb_header); static inline int skb_alloc_rx_flag(const struct sk_buff *skb) { |