Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm

[~andy/linux] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 93c27f71122a8d88139cdb8ae251b5e953404485..91140fe8c119a317b28d62ce1255f00d8719dba8 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -41,8 +41,7 @@
 #define SKB_DATA_ALIGN(X)      (((X) + (SMP_CACHE_BYTES - 1)) & \
                                 ~(SMP_CACHE_BYTES - 1))
 #define SKB_WITH_OVERHEAD(X)   \
-       (((X) - sizeof(struct skb_shared_info)) & \
-        ~(SMP_CACHE_BYTES - 1))
+       ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 #define SKB_MAX_ORDER(X, ORDER) \
        SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))
 #define SKB_MAX_HEAD(X)                (SKB_MAX_ORDER((X), 0))
@@ -301,8 +300,9 @@ struct sk_buff {
 #endif
 
        int                     iif;
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
        __u16                   queue_mapping;
-
+#endif
 #ifdef CONFIG_NET_SCHED
        __u16                   tc_index;       /* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT
@@ -357,6 +357,7 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
 }
 
 extern void           kfree_skbmem(struct sk_buff *skb);
+extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
 extern struct sk_buff *skb_clone(struct sk_buff *skb,
                                 gfp_t priority);
 extern struct sk_buff *skb_copy(const struct sk_buff *skb,
@@ -386,7 +387,9 @@ extern void       skb_truesize_bug(struct sk_buff *skb);
 
 static inline void skb_truesize_check(struct sk_buff *skb)
 {
-       if (unlikely((int)skb->truesize < sizeof(struct sk_buff) + skb->len))
+       int len = sizeof(struct sk_buff) + skb->len;
+
+       if (unlikely((int)skb->truesize < len))
                skb_truesize_bug(skb);
 }
 
@@ -993,7 +996,7 @@ static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len)
  *
  *     Return the number of bytes of free space at the head of an &sk_buff.
  */
-static inline int skb_headroom(const struct sk_buff *skb)
+static inline unsigned int skb_headroom(const struct sk_buff *skb)
 {
        return skb->data - skb->head;
 }
@@ -1346,12 +1349,28 @@ static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
  *     Returns true if modifying the header part of the cloned buffer
  *     does not requires the data to be copied.
  */
-static inline int skb_clone_writable(struct sk_buff *skb, int len)
+static inline int skb_clone_writable(struct sk_buff *skb, unsigned int len)
 {
        return !skb_header_cloned(skb) &&
               skb_headroom(skb) + len <= skb->hdr_len;
 }
 
+static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
+                           int cloned)
+{
+       int delta = 0;
+
+       if (headroom < NET_SKB_PAD)
+               headroom = NET_SKB_PAD;
+       if (headroom > skb_headroom(skb))
+               delta = headroom - skb_headroom(skb);
+
+       if (delta || cloned)
+               return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
+                                       GFP_ATOMIC);
+       return 0;
+}
+
 /**
  *     skb_cow - copy header of skb when it is required
  *     @skb: buffer to cow
@@ -1366,16 +1385,22 @@ static inline int skb_clone_writable(struct sk_buff *skb, int len)
  */
 static inline int skb_cow(struct sk_buff *skb, unsigned int headroom)
 {
-       int delta = (headroom > NET_SKB_PAD ? headroom : NET_SKB_PAD) -
-                       skb_headroom(skb);
-
-       if (delta < 0)
-               delta = 0;
+       return __skb_cow(skb, headroom, skb_cloned(skb));
+}
 
-       if (delta || skb_cloned(skb))
-               return pskb_expand_head(skb, (delta + (NET_SKB_PAD-1)) &
-                               ~(NET_SKB_PAD-1), 0, GFP_ATOMIC);
-       return 0;
+/**
+ *     skb_cow_head - skb_cow but only making the head writable
+ *     @skb: buffer to cow
+ *     @headroom: needed headroom
+ *
+ *     This function is identical to skb_cow except that we replace the
+ *     skb_cloned check by skb_header_cloned.  It should be used when
+ *     you only need to push on some header and do not need to modify
+ *     the data.
+ */
+static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
+{
+       return __skb_cow(skb, headroom, skb_header_cloned(skb));
 }
 
 /**
@@ -1747,6 +1772,15 @@ static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)
 #endif
 }
 
+static inline u16 skb_get_queue_mapping(struct sk_buff *skb)
+{
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+       return skb->queue_mapping;
+#else
+       return 0;
+#endif
+}
+
 static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from)
 {
 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
@@ -1759,6 +1793,11 @@ static inline int skb_is_gso(const struct sk_buff *skb)
        return skb_shinfo(skb)->gso_size;
 }
 
+static inline int skb_is_gso_v6(const struct sk_buff *skb)
+{
+       return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6;
+}
+
 static inline void skb_forward_csum(struct sk_buff *skb)
 {
        /* Unfortunately we don't support this one.  Any brave souls? */