2 files changed, 61 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index acf17af45af9..cf2cb50f77d1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1687,6 +1687,8 @@ extern int	       skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
                                  int shiftlen);
 
 extern struct sk_buff *skb_segment(struct sk_buff *skb, int features);
+extern int             skb_gro_receive(struct sk_buff **head,
+                                       struct sk_buff *skb);
 
 static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
                                        int len, void *buffer)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 18e224af05a6..b8d0abb26433 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2582,6 +2582,65 @@ err:
 
 EXPORT_SYMBOL_GPL(skb_segment);
 
+int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+        struct sk_buff *p = *head;
+        struct sk_buff *nskb;
+        unsigned int headroom;
+        unsigned int hlen = p->data - skb_mac_header(p);
+
+        if (hlen + p->len + skb->len >= 65536)
+                return -E2BIG;
+
+        if (skb_shinfo(p)->frag_list)
+                goto merge;
+
+        headroom = skb_headroom(p);
+        nskb = netdev_alloc_skb(p->dev, headroom);
+        if (unlikely(!nskb))
+                return -ENOMEM;
+
+        __copy_skb_header(nskb, p);
+        nskb->mac_len = p->mac_len;
+
+        skb_reserve(nskb, headroom);
+
+        skb_set_mac_header(nskb, -hlen);
+        skb_set_network_header(nskb, skb_network_offset(p));
+        skb_set_transport_header(nskb, skb_transport_offset(p));
+
+        memcpy(skb_mac_header(nskb), skb_mac_header(p), hlen);
+
+        *NAPI_GRO_CB(nskb) = *NAPI_GRO_CB(p);
+        skb_shinfo(nskb)->frag_list = p;
+        skb_header_release(p);
+        nskb->prev = p;
+
+        nskb->data_len += p->len;
+        nskb->truesize += p->len;
+        nskb->len += p->len;
+
+        *head = nskb;
+        nskb->next = p->next;
+        p->next = NULL;
+
+        p = nskb;
+
+merge:
+        NAPI_GRO_CB(p)->count++;
+        p->prev->next = skb;
+        p->prev = skb;
+        skb_header_release(skb);
+
+        p->data_len += skb->len;
+        p->truesize += skb->len;
+        p->len += skb->len;
+
+        NAPI_GRO_CB(skb)->same_flow = 1;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(skb_gro_receive);
+
 void __init skb_init(void)
 {
         skbuff_head_cache = kmem_cache_create("skbuff_head_cache",