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authorPatrick McHardy <kaber@trash.net>2005-08-14 17:24:31 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 15:58:24 -0700
commita61bbcf28a8cb0ba56f8193d512f7222e711a294 (patch)
tree33ae1976ab3b08aac516debb2742d2c6696d5436 /include/linux/skbuff.h
parent25ed891019b84498c83903ecf53df7ce35e9cff6 (diff)
[NET]: Store skb->timestamp as offset to a base timestamp
Reduces skb size by 8 bytes on 64-bit. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h47
1 files changed, 45 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 60b32151f76a..32635c401d4d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -155,13 +155,20 @@ struct skb_shared_info {
#define SKB_DATAREF_SHIFT 16
#define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)
+extern struct timeval skb_tv_base;
+
+struct skb_timeval {
+ u32 off_sec;
+ u32 off_usec;
+};
+
/**
* struct sk_buff - socket buffer
* @next: Next buffer in list
* @prev: Previous buffer in list
* @list: List we are on
* @sk: Socket we are owned by
- * @stamp: Time we arrived
+ * @tstamp: Time we arrived stored as offset to skb_tv_base
* @dev: Device we arrived on/are leaving by
* @input_dev: Device we arrived on
* @h: Transport layer header
@@ -202,7 +209,7 @@ struct sk_buff {
struct sk_buff *prev;
struct sock *sk;
- struct timeval stamp;
+ struct skb_timeval tstamp;
struct net_device *dev;
struct net_device *input_dev;
@@ -1213,6 +1220,42 @@ static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
extern void skb_init(void);
extern void skb_add_mtu(int mtu);
+/**
+ * skb_get_timestamp - get timestamp from a skb
+ * @skb: skb to get stamp from
+ * @stamp: pointer to struct timeval to store stamp in
+ *
+ * Timestamps are stored in the skb as offsets to a base timestamp.
+ * This function converts the offset back to a struct timeval and stores
+ * it in stamp.
+ */
+static inline void skb_get_timestamp(struct sk_buff *skb, struct timeval *stamp)
+{
+ stamp->tv_sec = skb->tstamp.off_sec;
+ stamp->tv_usec = skb->tstamp.off_usec;
+ if (skb->tstamp.off_sec) {
+ stamp->tv_sec += skb_tv_base.tv_sec;
+ stamp->tv_usec += skb_tv_base.tv_usec;
+ }
+}
+
+/**
+ * skb_set_timestamp - set timestamp of a skb
+ * @skb: skb to set stamp of
+ * @stamp: pointer to struct timeval to get stamp from
+ *
+ * Timestamps are stored in the skb as offsets to a base timestamp.
+ * This function converts a struct timeval to an offset and stores
+ * it in the skb.
+ */
+static inline void skb_set_timestamp(struct sk_buff *skb, struct timeval *stamp)
+{
+ skb->tstamp.off_sec = stamp->tv_sec - skb_tv_base.tv_sec;
+ skb->tstamp.off_usec = stamp->tv_usec - skb_tv_base.tv_usec;
+}
+
+extern void __net_timestamp(struct sk_buff *skb);
+
#ifdef CONFIG_NETFILTER
static inline void nf_conntrack_put(struct nf_conntrack *nfct)
{