sch_cake: Fix tin order when set through skb->priority

In diffserv mode, CAKE stores tins in a different order internally than
the logical order exposed to userspace. The order remapping was missing
in the handling of 'tc filter' priority mappings through skb->priority,
resulting in bulk and best effort mappings being reversed relative to
how they are displayed.

Fix this by adding the missing mapping when reading skb->priority.

Fixes: 83f8fd69af4f ("sch_cake: Add DiffServ handling")
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c
index 3069569..539c949 100644 (file)
--- a/net/sched/sch_cake.c
+++ b/net/sched/sch_cake.c
@@ -1546,7 +1546,7 @@ static struct cake_tin_data *cake_select_tin(struct Qdisc *sch,
        if (TC_H_MAJ(skb->priority) == sch->handle &&
            TC_H_MIN(skb->priority) > 0 &&
            TC_H_MIN(skb->priority) <= q->tin_cnt) {
-               tin = TC_H_MIN(skb->priority) - 1;
+               tin = q->tin_order[TC_H_MIN(skb->priority) - 1];
 
                if (q->rate_flags & CAKE_FLAG_WASH)
                        cake_wash_diffserv(skb);