net: add skb_recycle_check() to enable netdriver skb recycling

This patch adds skb_recycle_check(), which can be used by a network
driver after transmitting an skb to check whether this skb can be
recycled as a receive buffer.

skb_recycle_check() checks that the skb is not shared or cloned, and
that it is linear and its head portion large enough (as determined by
the driver) to be recycled as a receive buffer.  If these conditions
are met, it does any necessary reference count dropping and cleans
up the skbuff as if it just came from __alloc_skb().

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a19ea43..720b688 100644 (file)
--- a/include/linux/skbuff.h
+++ b/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/net/core/skbuff.c b/net/core/skbuff.c
index ca1ccdf..2c218a0 100644 (file)
--- a/net/core/skbuff.c
+++ b/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;