1 files changed, 50 insertions, 14 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fd389162f01..fa51293f2708 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -189,20 +189,23 @@ struct skb_shared_info {
         atomic_t        dataref;
         unsigned short  nr_frags;
         unsigned short  gso_size;
+#ifdef CONFIG_HAS_DMA
+        dma_addr_t      dma_head;
+#endif
         /* Warning: this field is not always filled in (UFO)! */
         unsigned short  gso_segs;
         unsigned short  gso_type;
         __be32          ip6_frag_id;
         union skb_shared_tx tx_flags;
-#ifdef CONFIG_HAS_DMA
-        unsigned int    num_dma_maps;
-#endif
         struct sk_buff  *frag_list;
         struct skb_shared_hwtstamps hwtstamps;
         skb_frag_t      frags[MAX_SKB_FRAGS];
 #ifdef CONFIG_HAS_DMA
-        dma_addr_t      dma_maps[MAX_SKB_FRAGS + 1];
+        dma_addr_t      dma_maps[MAX_SKB_FRAGS];
 #endif
+        /* Intermediate layers must ensure that destructor_arg
+         * remains valid until skb destructor */
+        void *          destructor_arg;
 };
 
 /* We divide dataref into two halves.  The higher 16 bits hold references
@@ -301,9 +304,6 @@ typedef unsigned char *sk_buff_data_t;
  *      @tc_verd: traffic control verdict
  *      @ndisc_nodetype: router type (from link layer)
  *      @do_not_encrypt: set to prevent encryption of this frame
- *      @requeue: set to indicate that the wireless core should attempt
- *              a software retry on this frame if we failed to
- *              receive an ACK for it
  *      @dma_cookie: a cookie to one of several possible DMA operations
  *              done by skb DMA functions
  *      @secmark: security marking
@@ -319,10 +319,7 @@ struct sk_buff {
         ktime_t                 tstamp;
         struct net_device       *dev;
 
-        union {
-                struct  dst_entry       *dst;
-                struct  rtable          *rtable;
-        };
+        unsigned long           _skb_dst;
 #ifdef CONFIG_XFRM
         struct  sec_path        *sp;
 #endif
@@ -380,7 +377,6 @@ struct sk_buff {
 #endif
 #if defined(CONFIG_MAC80211) || defined(CONFIG_MAC80211_MODULE)
         __u8                    do_not_encrypt:1;
-        __u8                    requeue:1;
 #endif
         /* 0/13/14 bit hole */
 
@@ -423,6 +419,21 @@ extern void skb_dma_unmap(struct device *dev, struct sk_buff *skb,
                           enum dma_data_direction dir);
 #endif
 
+static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
+{
+        return (struct dst_entry *)skb->_skb_dst;
+}
+
+static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
+{
+        skb->_skb_dst = (unsigned long)dst;
+}
+
+static inline struct rtable *skb_rtable(const struct sk_buff *skb)
+{
+        return (struct rtable *)skb_dst(skb);
+}
+
 extern void kfree_skb(struct sk_buff *skb);
 extern void consume_skb(struct sk_buff *skb);
 extern void            __kfree_skb(struct sk_buff *skb);
@@ -1062,7 +1073,7 @@ 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_FRAG_ASSERT(skb)    BUG_ON(skb_has_frags(skb))
 #define SKB_LINEAR_ASSERT(skb)  BUG_ON(skb_is_nonlinear(skb))
 
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
@@ -1701,6 +1712,25 @@ static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
                      skb = skb->prev)
 
 
+static inline bool skb_has_frags(const struct sk_buff *skb)
+{
+        return skb_shinfo(skb)->frag_list != NULL;
+}
+
+static inline void skb_frag_list_init(struct sk_buff *skb)
+{
+        skb_shinfo(skb)->frag_list = NULL;
+}
+
+static inline void skb_frag_add_head(struct sk_buff *skb, struct sk_buff *frag)
+{
+        frag->next = skb_shinfo(skb)->frag_list;
+        skb_shinfo(skb)->frag_list = frag;
+}
+
+#define skb_walk_frags(skb, iter)       \
+        for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next)
+
 extern struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,
                                            int *peeked, int *err);
 extern struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,
@@ -1715,8 +1745,14 @@ extern int	       skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
                                                         struct iovec *iov);
 extern int             skb_copy_datagram_from_iovec(struct sk_buff *skb,
                                                     int offset,
-                                                    struct iovec *from,
+                                                    const struct iovec *from,
+                                                    int from_offset,
                                                     int len);
+extern int             skb_copy_datagram_const_iovec(const struct sk_buff *from,
+                                                     int offset,
+                                                     const struct iovec *to,
+                                                     int to_offset,
+                                                     int size);
 extern void            skb_free_datagram(struct sock *sk, struct sk_buff *skb);
 extern int             skb_kill_datagram(struct sock *sk, struct sk_buff *skb,
                                          unsigned int flags);