---

yaml --- r: 111987 b: refs/heads/master c: 04a4bb5 h: refs/heads/master i: 111985: 01306ca 111983: 7d7dee9 v: v3
git-mirror · Oct 1, 2008 · 86d7e89 · 86d7e89
1 parent b121bf9
commit 86d7e89
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Showing 3 changed files with 42 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 788df7322a7543a337c1ea400d38b621346ea78e
+refs/heads/master: 04a4bb55bcf35b63d40fd2725e58599ff8310dd7
diff --git a/trunk/include/linux/skbuff.h b/trunk/include/linux/skbuff.h
@@ -383,6 +383,8 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
 	return __alloc_skb(size, priority, 1, -1);
 }
 
+extern int skb_recycle_check(struct sk_buff *skb, int skb_size);
+
 extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
 extern struct sk_buff *skb_clone(struct sk_buff *skb,
 				 gfp_t priority);

diff --git a/trunk/net/core/skbuff.c b/trunk/net/core/skbuff.c
@@ -363,8 +363,7 @@ static void kfree_skbmem(struct sk_buff *skb)
 	}
 }
 
-/* Free everything but the sk_buff shell. */
-static void skb_release_all(struct sk_buff *skb)
+static void skb_release_head_state(struct sk_buff *skb)
 {
 	dst_release(skb->dst);
 #ifdef CONFIG_XFRM
@@ -388,6 +387,12 @@ static void skb_release_all(struct sk_buff *skb)
 	skb->tc_verd = 0;
 #endif
 #endif
+}
+
+/* Free everything but the sk_buff shell. */
+static void skb_release_all(struct sk_buff *skb)
+{
+	skb_release_head_state(skb);
 	skb_release_data(skb);
 }
 
@@ -424,6 +429,38 @@ void kfree_skb(struct sk_buff *skb)
 	__kfree_skb(skb);
 }
 
+int skb_recycle_check(struct sk_buff *skb, int skb_size)
+{
+	struct skb_shared_info *shinfo;
+
+	if (skb_is_nonlinear(skb) || skb->fclone != SKB_FCLONE_UNAVAILABLE)
+		return 0;
+
+	skb_size = SKB_DATA_ALIGN(skb_size + NET_SKB_PAD);
+	if (skb_end_pointer(skb) - skb->head < skb_size)
+		return 0;
+
+	if (skb_shared(skb) || skb_cloned(skb))
+		return 0;
+
+	skb_release_head_state(skb);
+	shinfo = skb_shinfo(skb);
+	atomic_set(&shinfo->dataref, 1);
+	shinfo->nr_frags = 0;
+	shinfo->gso_size = 0;
+	shinfo->gso_segs = 0;
+	shinfo->gso_type = 0;
+	shinfo->ip6_frag_id = 0;
+	shinfo->frag_list = NULL;
+
+	memset(skb, 0, offsetof(struct sk_buff, tail));
+	skb_reset_tail_pointer(skb);
+	skb->data = skb->head + NET_SKB_PAD;
+
+	return 1;
+}
+EXPORT_SYMBOL(skb_recycle_check);
+
 static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 {
 	new->tstamp		= old->tstamp;