Commit 8af27456 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David S. Miller
Browse files

[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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 52499afe

include/linux/skbuff.h

+22 −0
Original line number Diff line number Diff line
@@ -1104,6 +1104,28 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length) 
	return __dev_alloc_skb(length, GFP_ATOMIC);

}



extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev,

		unsigned int length, gfp_t gfp_mask);



/**

 *	netdev_alloc_skb - allocate an skbuff for rx on a specific device

 *	@dev: network device to receive on

 *	@length: length to allocate

 *

 *	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. Although this function

 *	allocates memory it can be called from an interrupt.

 */

static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,

		unsigned int length)

{

	return __netdev_alloc_skb(dev, length, GFP_ATOMIC);

}



/**

 *	skb_cow - copy header of skb when it is required

 *	@skb: buffer to cow

net/core/skbuff.c

+24 −0
Original line number Diff line number Diff line
@@ -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);

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