[INET]: Use pskb_trim_unique when trimming paged unique skbs

[linux-2.6.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fb72da7da03656cad40587408751f94954a11d5..755e9cddac47eebe516751a55929f4339b576c5f 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -171,10 +171,15 @@ enum {
 
 enum {
        SKB_GSO_TCPV4 = 1 << 0,
-       SKB_GSO_UDPV4 = 1 << 1,
+       SKB_GSO_UDP = 1 << 1,
 
        /* This indicates the skb is from an untrusted source. */
        SKB_GSO_DODGY = 1 << 2,
+
+       /* This indicates the tcp segment has CWR set. */
+       SKB_GSO_TCP_ECN = 1 << 3,
+
+       SKB_GSO_TCPV6 = 1 << 4,
 };
 
 /** 
@@ -599,6 +604,14 @@ static inline __u32 skb_queue_len(const struct sk_buff_head *list_)
        return list_->qlen;
 }
 
+/*
+ * This function creates a split out lock class for each invocation;
+ * this is needed for now since a whole lot of users of the skb-queue
+ * infrastructure in drivers have different locking usage (in hardirq)
+ * than the networking core (in softirq only). In the long run either the
+ * network layer or drivers should need annotation to consolidate the
+ * main types of usage into 3 classes.
+ */
 static inline void skb_queue_head_init(struct sk_buff_head *list)
 {
        spin_lock_init(&list->lock);
@@ -1026,6 +1039,21 @@ static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
        return (len < skb->len) ? __pskb_trim(skb, len) : 0;
 }
 
+/**
+ *     pskb_trim_unique - remove end from a paged unique (not cloned) buffer
+ *     @skb: buffer to alter
+ *     @len: new length
+ *
+ *     This is identical to pskb_trim except that the caller knows that
+ *     the skb is not cloned so we should never get an error due to out-
+ *     of-memory.
+ */
+static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len)
+{
+       int err = pskb_trim(skb, len);
+       BUG_ON(err);
+}
+
 /**
  *     skb_orphan - orphan a buffer
  *     @skb: buffer to orphan
@@ -1058,9 +1086,8 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
                kfree_skb(skb);
 }
 
-#ifndef CONFIG_HAVE_ARCH_DEV_ALLOC_SKB
 /**
- *     __dev_alloc_skb - allocate an skbuff for sending
+ *     __dev_alloc_skb - allocate an skbuff for receiving
  *     @length: length to allocate
  *     @gfp_mask: get_free_pages mask, passed to alloc_skb
  *
@@ -1069,7 +1096,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
  *     the headroom they think they need without accounting for the
  *     built in space. The built in space is used for optimisations.
  *
- *     %NULL is returned in there is no free memory.
+ *     %NULL is returned if there is no free memory.
  */
 static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
                                              gfp_t gfp_mask)
@@ -1079,12 +1106,9 @@ static inline struct sk_buff *__dev_alloc_skb(unsigned int length,
                skb_reserve(skb, NET_SKB_PAD);
        return skb;
 }
-#else
-extern struct sk_buff *__dev_alloc_skb(unsigned int length, int gfp_mask);
-#endif
 
 /**
- *     dev_alloc_skb - allocate an skbuff for sending
+ *     dev_alloc_skb - allocate an skbuff for receiving
  *     @length: length to allocate
  *
  *     Allocate a new &sk_buff and assign it a usage count of one. The
@@ -1092,7 +1116,7 @@ extern struct sk_buff *__dev_alloc_skb(unsigned int length, int gfp_mask);
  *     the headroom they think they need without accounting for the
  *     built in space. The built in space is used for optimisations.
  *
- *     %NULL is returned in there is no free memory. Although this function
+ *     %NULL is returned if there is no free memory. Although this function
  *     allocates memory it can be called from an interrupt.
  */
 static inline struct sk_buff *dev_alloc_skb(unsigned int length)
@@ -1100,6 +1124,28 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length)
        return __dev_alloc_skb(length, GFP_ATOMIC);
 }
 
+extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
+               unsigned int length, gfp_t gfp_mask);
+
+/**
+ *     netdev_alloc_skb - allocate an skbuff for rx on a specific device
+ *     @dev: network device to receive on
+ *     @length: length to allocate
+ *
+ *     Allocate a new &sk_buff and assign it a usage count of one. The
+ *     buffer has unspecified headroom built in. Users should allocate
+ *     the headroom they think they need without accounting for the
+ *     built in space. The built in space is used for optimisations.
+ *
+ *     %NULL is returned if there is no free memory. Although this function
+ *     allocates memory it can be called from an interrupt.
+ */
+static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
+               unsigned int length)
+{
+       return __netdev_alloc_skb(dev, length, GFP_ATOMIC);
+}
+
 /**
  *     skb_cow - copy header of skb when it is required
  *     @skb: buffer to cow
@@ -1301,7 +1347,6 @@ extern void              skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
 extern void           skb_split(struct sk_buff *skb,
                                 struct sk_buff *skb1, const u32 len);
 
-extern void           skb_release_data(struct sk_buff *skb);
 extern struct sk_buff *skb_segment(struct sk_buff *skb, int features);
 
 static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
@@ -1448,5 +1493,10 @@ static inline void skb_init_secmark(struct sk_buff *skb)
 { }
 #endif
 
+static inline int skb_is_gso(const struct sk_buff *skb)
+{
+       return skb_shinfo(skb)->gso_size;
+}
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_SKBUFF_H */