1 files changed, 14 insertions, 0 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 8a67f24cbe02..a02ec9e5fea5 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -302,4 +302,18 @@ drop:
         return NET_XMIT_DROP;
 }
 
+/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
+   long it will take to send a packet given its size.
+ */
+static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
+{
+        int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
+        if (slot < 0)
+                slot = 0;
+        slot >>= rtab->rate.cell_log;
+        if (slot > 255)
+                return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
+        return rtab->data[slot];
+}
+
 #endif