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: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -968,6 +968,9 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
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skb_shinfo(skb)->nr_frags = i + 1;
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}
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extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,
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int off, int size);
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#define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
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#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_shinfo(skb)->frag_list)
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#define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
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@ -1382,6 +1385,26 @@ static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
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return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
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}
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extern struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask);
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/**
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* netdev_alloc_page - allocate a page for ps-rx on a specific device
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* @dev: network device to receive on
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*
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* Allocate a new page node local to the specified device.
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*
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* %NULL is returned if there is no free memory.
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*/
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static inline struct page *netdev_alloc_page(struct net_device *dev)
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{
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return __netdev_alloc_page(dev, GFP_ATOMIC);
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}
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static inline void netdev_free_page(struct net_device *dev, struct page *page)
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{
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__free_page(page);
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}
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/**
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* skb_clone_writable - is the header of a clone writable
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* @skb: buffer to check
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@ -263,6 +263,26 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
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return skb;
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}
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struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
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{
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int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
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struct page *page;
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page = alloc_pages_node(node, gfp_mask, 0);
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return page;
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}
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EXPORT_SYMBOL(__netdev_alloc_page);
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void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
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int size)
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{
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skb_fill_page_desc(skb, i, page, off, size);
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skb->len += size;
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skb->data_len += size;
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skb->truesize += size;
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}
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EXPORT_SYMBOL(skb_add_rx_frag);
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/**
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* dev_alloc_skb - allocate an skbuff for receiving
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* @length: length to allocate
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