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authorChristoph Hellwig <hch@lst.de>2006-07-31 22:35:23 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-08-02 13:38:25 -0700
commit8af2745645243b5e5b031504a643bf2158571dc7 (patch)
tree32bf05d47473c2b586daee33f343e0eea1bbf943 /net/core
parent52499afe40387524e9f46ef9ce4695efccdd2ed9 (diff)
[NET]: Add netdev_alloc_skb().
Add a dev_alloc_skb variant that takes a struct net_device * paramater. For now that paramater is unused, but I'll use it to allocate the skb from node-local memory in a follow-up patch. Also there have been some other plans mentioned on the list that can use it. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d236f02c6467..71487b915d67 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -256,6 +256,29 @@ nodata:
goto out;
}
+/**
+ * __netdev_alloc_skb - allocate an skbuff for rx on a specific device
+ * @dev: network device to receive on
+ * @length: length to allocate
+ * @gfp_mask: get_free_pages mask, passed to alloc_skb
+ *
+ * Allocate a new &sk_buff and assign it a usage count of one. The
+ * buffer has unspecified headroom built in. Users should allocate
+ * the headroom they think they need without accounting for the
+ * built in space. The built in space is used for optimisations.
+ *
+ * %NULL is returned if there is no free memory.
+ */
+struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
+ unsigned int length, gfp_t gfp_mask)
+{
+ struct sk_buff *skb;
+
+ skb = alloc_skb(length + NET_SKB_PAD, gfp_mask);
+ if (likely(skb))
+ skb_reserve(skb, NET_SKB_PAD);
+ return skb;
+}
static void skb_drop_list(struct sk_buff **listp)
{
@@ -2048,6 +2071,7 @@ EXPORT_SYMBOL(__kfree_skb);
EXPORT_SYMBOL(kfree_skb);
EXPORT_SYMBOL(__pskb_pull_tail);
EXPORT_SYMBOL(__alloc_skb);
+EXPORT_SYMBOL(__netdev_alloc_skb);
EXPORT_SYMBOL(pskb_copy);
EXPORT_SYMBOL(pskb_expand_head);
EXPORT_SYMBOL(skb_checksum);