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Commit 654bed16 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by David S. Miller
Browse files

net: packet split receive api 



Add some packet-split receive hooks.

For one this allows to do NUMA node affine page allocs. Later on these
hooks will be extended to do emergency reserve allocations for
fragments.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c57943a1

include/linux/skbuff.h

+23 −0
Original line number Diff line number Diff line
@@ -968,6 +968,9 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i, 
	skb_shinfo(skb)->nr_frags = i + 1;

}



extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,

			    int off, int size);



#define SKB_PAGE_ASSERT(skb) 	BUG_ON(skb_shinfo(skb)->nr_frags)

#define SKB_FRAG_ASSERT(skb) 	BUG_ON(skb_shinfo(skb)->frag_list)

#define SKB_LINEAR_ASSERT(skb)  BUG_ON(skb_is_nonlinear(skb))
@@ -1382,6 +1385,26 @@ static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev, 
	return __netdev_alloc_skb(dev, length, GFP_ATOMIC);

}



extern struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask);



/**

 *	netdev_alloc_page - allocate a page for ps-rx on a specific device

 *	@dev: network device to receive on

 *

 * 	Allocate a new page node local to the specified device.

 *

 * 	%NULL is returned if there is no free memory.

 */

static inline struct page *netdev_alloc_page(struct net_device *dev)

{

	return __netdev_alloc_page(dev, GFP_ATOMIC);

}



static inline void netdev_free_page(struct net_device *dev, struct page *page)

{

	__free_page(page);

}



/**

 *	skb_clone_writable - is the header of a clone writable

 *	@skb: buffer to check

net/core/skbuff.c

+20 −0
Original line number Diff line number Diff line
@@ -263,6 +263,26 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, 
	return skb;

}



struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)

{

	int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;

	struct page *page;



	page = alloc_pages_node(node, gfp_mask, 0);

	return page;

}

EXPORT_SYMBOL(__netdev_alloc_page);



void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,

		int size)

{

	skb_fill_page_desc(skb, i, page, off, size);

	skb->len += size;

	skb->data_len += size;

	skb->truesize += size;

}

EXPORT_SYMBOL(skb_add_rx_frag);



/**

 *	dev_alloc_skb - allocate an skbuff for receiving

 *	@length: length to allocate