net: skb_frag_t can be smaller on small arches

[pandora-kernel.git] / include / linux / skbuff.h

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d20d9e7..0b53c43 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -129,8 +129,13 @@ typedef struct skb_frag_struct skb_frag_t;
 
 struct skb_frag_struct {
        struct page *page;
+#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
        __u32 page_offset;
        __u32 size;
+#else
+       __u16 page_offset;
+       __u16 size;
+#endif
 };
 
 #define HAVE_HW_TIME_STAMP
@@ -163,26 +168,19 @@ struct skb_shared_hwtstamps {
        ktime_t syststamp;
 };
 
-/**
- * struct skb_shared_tx - instructions for time stamping of outgoing packets
- * @hardware:          generate hardware time stamp
- * @software:          generate software time stamp
- * @in_progress:       device driver is going to provide
- *                     hardware time stamp
- * @prevent_sk_orphan: make sk reference available on driver level
- * @flags:             all shared_tx flags
- *
- * These flags are attached to packets as part of the
- * &skb_shared_info. Use skb_tx() to get a pointer.
- */
-union skb_shared_tx {
-       struct {
-               __u8    hardware:1,
-                       software:1,
-                       in_progress:1,
-                       prevent_sk_orphan:1;
-       };
-       __u8 flags;
+/* Definitions for tx_flags in struct skb_shared_info */
+enum {
+       /* generate hardware time stamp */
+       SKBTX_HW_TSTAMP = 1 << 0,
+
+       /* generate software time stamp */
+       SKBTX_SW_TSTAMP = 1 << 1,
+
+       /* device driver is going to provide hardware time stamp */
+       SKBTX_IN_PROGRESS = 1 << 2,
+
+       /* ensure the originating sk reference is available on driver level */
+       SKBTX_DRV_NEEDS_SK_REF = 1 << 3,
 };
 
 /* This data is invariant across clones and lives at
@@ -195,7 +193,7 @@ struct skb_shared_info {
        unsigned short  gso_segs;
        unsigned short  gso_type;
        __be32          ip6_frag_id;
-       union skb_shared_tx tx_flags;
+       __u8            tx_flags;
        struct sk_buff  *frag_list;
        struct skb_shared_hwtstamps hwtstamps;
 
@@ -558,6 +556,15 @@ extern unsigned int   skb_find_text(struct sk_buff *skb, unsigned int from,
                                    unsigned int to, struct ts_config *config,
                                    struct ts_state *state);
 
+extern __u32 __skb_get_rxhash(struct sk_buff *skb);
+static inline __u32 skb_get_rxhash(struct sk_buff *skb)
+{
+       if (!skb->rxhash)
+               skb->rxhash = __skb_get_rxhash(skb);
+
+       return skb->rxhash;
+}
+
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
 static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
 {
@@ -578,11 +585,6 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
        return &skb_shinfo(skb)->hwtstamps;
 }
 
-static inline union skb_shared_tx *skb_tx(struct sk_buff *skb)
-{
-       return &skb_shinfo(skb)->tx_flags;
-}
-
 /**
  *     skb_queue_empty - check if a queue is empty
  *     @list: queue head
@@ -604,7 +606,7 @@ static inline int skb_queue_empty(const struct sk_buff_head *list)
 static inline bool skb_queue_is_last(const struct sk_buff_head *list,
                                     const struct sk_buff *skb)
 {
-       return (skb->next == (struct sk_buff *) list);
+       return skb->next == (struct sk_buff *)list;
 }
 
 /**
@@ -617,7 +619,7 @@ static inline bool skb_queue_is_last(const struct sk_buff_head *list,
 static inline bool skb_queue_is_first(const struct sk_buff_head *list,
                                      const struct sk_buff *skb)
 {
-       return (skb->prev == (struct sk_buff *) list);
+       return skb->prev == (struct sk_buff *)list;
 }
 
 /**
@@ -1123,7 +1125,7 @@ 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_has_frags(skb))
+#define SKB_FRAG_ASSERT(skb)   BUG_ON(skb_has_frag_list(skb))
 #define SKB_LINEAR_ASSERT(skb)  BUG_ON(skb_is_nonlinear(skb))
 
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
@@ -1379,6 +1381,11 @@ static inline int skb_network_offset(const struct sk_buff *skb)
        return skb_network_header(skb) - skb->data;
 }
 
+static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len)
+{
+       return pskb_may_pull(skb, skb_network_offset(skb) + len);
+}
+
 /*
  * CPUs often take a performance hit when accessing unaligned memory
  * locations. The actual performance hit varies, it can be small if the
@@ -1782,7 +1789,7 @@ 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)
+static inline bool skb_has_frag_list(const struct sk_buff *skb)
 {
        return skb_shinfo(skb)->frag_list != NULL;
 }
@@ -1982,8 +1989,8 @@ extern void skb_tstamp_tx(struct sk_buff *orig_skb,
 
 static inline void sw_tx_timestamp(struct sk_buff *skb)
 {
-       union skb_shared_tx *shtx = skb_tx(skb);
-       if (shtx->software && !shtx->in_progress)
+       if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP &&
+           !(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
                skb_tstamp_tx(skb, NULL);
 }
 
@@ -2154,7 +2161,7 @@ static inline u16 skb_get_rx_queue(const struct sk_buff *skb)
 
 static inline bool skb_rx_queue_recorded(const struct sk_buff *skb)
 {
-       return (skb->queue_mapping != 0);
+       return skb->queue_mapping != 0;
 }
 
 extern u16 skb_tx_hash(const struct net_device *dev,
@@ -2204,6 +2211,21 @@ static inline void skb_forward_csum(struct sk_buff *skb)
                skb->ip_summed = CHECKSUM_NONE;
 }
 
+/**
+ * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE
+ * @skb: skb to check
+ *
+ * fresh skbs have their ip_summed set to CHECKSUM_NONE.
+ * Instead of forcing ip_summed to CHECKSUM_NONE, we can
+ * use this helper, to document places where we make this assertion.
+ */
+static inline void skb_checksum_none_assert(struct sk_buff *skb)
+{
+#ifdef DEBUG
+       BUG_ON(skb->ip_summed != CHECKSUM_NONE);
+#endif
+}
+
 bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
 #endif /* __KERNEL__ */
 #endif /* _LINUX_SKBUFF_H */