[PATCH 2/2]: [NET_SCHED]: Making rate table lookups more flexible.

[Jesper Dangaard Brouer]

commit ac093f5c2f1160ece72a6fef5c779c1892fc3152
Author: Jesper Dangaard Brouer <[EMAIL PROTECTED]>
Date:   Fri Aug 31 11:53:35 2007 +0200

    [NET_SCHED]: Making rate table lookups more flexible.  Extend the
    tc_ratespec struct, with two parameters: 1) "cell_align" that allow
    adjusting the alignment of the rate table. 2) "overhead" that allow
    adding a packet overhead before the lookup.
    
    Signed-off-by: Jesper Dangaard Brouer <[EMAIL PROTECTED]>

diff --git a/include/linux/pkt_sched.h b/include/linux/pkt_sched.h
index 268c515..a127d63 100644
--- a/include/linux/pkt_sched.h
+++ b/include/linux/pkt_sched.h
@@ -78,7 +78,8 @@ struct tc_ratespec
        unsigned char   cell_log;
        unsigned char   __reserved;
        unsigned short  feature;
-       short           addend;
+       char            cell_align;
+       unsigned char   overhead;
        unsigned short  mpu;
        __u32           rate;
 };
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 4ebd615..a02ec9e 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -307,7 +307,9 @@ drop:
  */
 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 {
-       int slot = 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]);

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