net_sched: update bstats in dequeue()

Class bytes/packets stats can be misleading because they are updated in
enqueue() while packet might be dropped later.

We already fixed all qdiscs but sch_atm.

This patch makes the final cleanup.

class rate estimators can now match qdisc ones.

Signed-off-by: Eric Dumazet <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sched/sch_atm.c

···
 		}
 		return ret;
 	}
-	qdisc_bstats_update(sch, skb);
-	bstats_update(&flow->bstats, skb);
 	/*
 	 * Okay, this may seem weird. We pretend we've dropped the packet if
 	 * it goes via ATM. The reason for this is that the outer qdisc
···
 			if (unlikely(!skb))
 				break;
 
+			qdisc_bstats_update(sch, skb);
+			bstats_update(&flow->bstats, skb);
 			pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 			/* remove any LL header somebody else has attached */
 			skb_pull(skb, skb_network_offset(skb));

net/sched/sch_drr.c

···
 		cl->deficit = cl->quantum;
 	}
 
-	bstats_update(&cl->bstats, skb);
-
 	sch->q.qlen++;
 	return err;
 }
···
 			skb = qdisc_dequeue_peeked(cl->qdisc);
 			if (cl->qdisc->q.qlen == 0)
 				list_del(&cl->alist);
+
+			bstats_update(&cl->bstats, skb);
 			qdisc_bstats_update(sch, skb);
 			sch->q.qlen--;
 			return skb;

net/sched/sch_hfsc.c

···
 	if (cl->qdisc->q.qlen == 1)
 		set_active(cl, qdisc_pkt_len(skb));
 
-	bstats_update(&cl->bstats, skb);
 	sch->q.qlen++;
 
 	return NET_XMIT_SUCCESS;
···
 		return NULL;
 	}
 
+	bstats_update(&cl->bstats, skb);
 	update_vf(cl, qdisc_pkt_len(skb), cur_time);
 	if (realtime)
 		cl->cl_cumul += qdisc_pkt_len(skb);

net/sched/sch_htb.c

···
 		}
 		return ret;
 	} else {
-		bstats_update(&cl->bstats, skb);
 		htb_activate(q, cl);
 	}
 
···
 	} while (cl != start);
 
 	if (likely(skb != NULL)) {
+		bstats_update(&cl->bstats, skb);
 		cl->un.leaf.deficit[level] -= qdisc_pkt_len(skb);
 		if (cl->un.leaf.deficit[level] < 0) {
 			cl->un.leaf.deficit[level] += cl->quantum;