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-rw-r--r--include/linux/skbuff.h21
-rw-r--r--net/core/skbuff.c51
2 files changed, 47 insertions, 25 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6fcbbbd12ceb..77ddf2de712f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -550,6 +550,7 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
return __alloc_skb(size, priority, 1, NUMA_NO_NODE);
}
+extern void skb_recycle(struct sk_buff *skb);
extern bool skb_recycle_check(struct sk_buff *skb, int skb_size);
extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
@@ -2484,5 +2485,25 @@ static inline void skb_checksum_none_assert(struct sk_buff *skb)
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
+static inline bool skb_is_recycleable(struct sk_buff *skb, int skb_size)
+{
+ if (irqs_disabled())
+ return false;
+
+ if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY)
+ return false;
+
+ if (skb_is_nonlinear(skb) || skb->fclone != SKB_FCLONE_UNAVAILABLE)
+ return false;
+
+ skb_size = SKB_DATA_ALIGN(skb_size + NET_SKB_PAD);
+ if (skb_end_pointer(skb) - skb->head < skb_size)
+ return false;
+
+ if (skb_shared(skb) || skb_cloned(skb))
+ return false;
+
+ return true;
+}
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index ce357d986251..e27104039a39 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -485,6 +485,30 @@ void consume_skb(struct sk_buff *skb)
EXPORT_SYMBOL(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;
+
+ 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_reset_tail_pointer(skb);
+}
+EXPORT_SYMBOL(skb_recycle);
+
+/**
* skb_recycle_check - check if skb can be reused for receive
* @skb: buffer
* @skb_size: minimum receive buffer size
@@ -498,33 +522,10 @@ EXPORT_SYMBOL(consume_skb);
*/
bool skb_recycle_check(struct sk_buff *skb, int skb_size)
{
- struct skb_shared_info *shinfo;
-
- if (irqs_disabled())
- return false;
-
- if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY)
- return false;
-
- if (skb_is_nonlinear(skb) || skb->fclone != SKB_FCLONE_UNAVAILABLE)
- return false;
-
- skb_size = SKB_DATA_ALIGN(skb_size + NET_SKB_PAD);
- if (skb_end_pointer(skb) - skb->head < skb_size)
- return false;
-
- if (skb_shared(skb) || skb_cloned(skb))
+ if (!skb_is_recycleable(skb, skb_size))
return false;
- 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_reset_tail_pointer(skb);
+ skb_recycle(skb);
return true;
}