[NET_SCHED]: Cleanup L2T macros and handle oversized packets
Change L2T (length to time) macros, in all rate based schedulers, to
call a common function qdisc_l2t() that does the rate table lookup.
This function handles if the packet size lookup is larger than the
rate table, which often occurs with TSO enabled.
Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 8a67f24..4ebd615 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -302,4 +302,16 @@
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;
+ slot >>= rtab->rate.cell_log;
+ if (slot > 255)
+ return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
+ return rtab->data[slot];
+}
+
#endif