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-rw-r--r--include/linux/skbuff.h59
1 files changed, 57 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 11b6925f0e96..6d8ed22accb4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -32,6 +32,7 @@
#include <linux/hrtimer.h>
#include <linux/dma-mapping.h>
#include <linux/netdev_features.h>
+#include <linux/sched.h>
#include <net/flow_keys.h>
/* A. Checksumming of received packets by device.
@@ -356,11 +357,62 @@ typedef unsigned int sk_buff_data_t;
typedef unsigned char *sk_buff_data_t;
#endif
+/**
+ * struct skb_mstamp - multi resolution time stamps
+ * @stamp_us: timestamp in us resolution
+ * @stamp_jiffies: timestamp in jiffies
+ */
+struct skb_mstamp {
+ union {
+ u64 v64;
+ struct {
+ u32 stamp_us;
+ u32 stamp_jiffies;
+ };
+ };
+};
+
+/**
+ * skb_mstamp_get - get current timestamp
+ * @cl: place to store timestamps
+ */
+static inline void skb_mstamp_get(struct skb_mstamp *cl)
+{
+ u64 val = local_clock();
+
+ do_div(val, NSEC_PER_USEC);
+ cl->stamp_us = (u32)val;
+ cl->stamp_jiffies = (u32)jiffies;
+}
+
+/**
+ * skb_mstamp_delta - compute the difference in usec between two skb_mstamp
+ * @t1: pointer to newest sample
+ * @t0: pointer to oldest sample
+ */
+static inline u32 skb_mstamp_us_delta(const struct skb_mstamp *t1,
+ const struct skb_mstamp *t0)
+{
+ s32 delta_us = t1->stamp_us - t0->stamp_us;
+ u32 delta_jiffies = t1->stamp_jiffies - t0->stamp_jiffies;
+
+ /* If delta_us is negative, this might be because interval is too big,
+ * or local_clock() drift is too big : fallback using jiffies.
+ */
+ if (delta_us <= 0 ||
+ delta_jiffies >= (INT_MAX / (USEC_PER_SEC / HZ)))
+
+ delta_us = jiffies_to_usecs(delta_jiffies);
+
+ return delta_us;
+}
+
+
/**
* struct sk_buff - socket buffer
* @next: Next buffer in list
* @prev: Previous buffer in list
- * @tstamp: Time we arrived
+ * @tstamp: Time we arrived/left
* @sk: Socket we are owned by
* @dev: Device we arrived on/are leaving by
* @cb: Control buffer. Free for use by every layer. Put private vars here
@@ -429,7 +481,10 @@ struct sk_buff {
struct sk_buff *next;
struct sk_buff *prev;
- ktime_t tstamp;
+ union {
+ ktime_t tstamp;
+ struct skb_mstamp skb_mstamp;
+ };
struct sock *sk;
struct net_device *dev;