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>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 720b688..2725f4e 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8bd248a..7f7bb1a 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -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