net_sched: sch_fq: ensure maxrate fq parameter applies to EDT flows
When EDT conversion happened, fq lost the ability to enfore a maxrate
for all flows. It kept it for non EDT flows.
This commit restores the functionality.
Tested:
tc qd replace dev eth0 root fq maxrate 500Mbit
netperf -P0 -H host -- -O THROUGHPUT
489.75
Fixes: ab408b6dc744 ("tcp: switch tcp and sch_fq to new earliest departure time model")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index 4b1af70..25a7cf6 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -469,22 +469,29 @@
goto begin;
}
prefetch(&skb->end);
- f->credit -= qdisc_pkt_len(skb);
+ plen = qdisc_pkt_len(skb);
+ f->credit -= plen;
- if (ktime_to_ns(skb->tstamp) || !q->rate_enable)
+ if (!q->rate_enable)
goto out;
rate = q->flow_max_rate;
- if (skb->sk)
- rate = min(skb->sk->sk_pacing_rate, rate);
- if (rate <= q->low_rate_threshold) {
- f->credit = 0;
- plen = qdisc_pkt_len(skb);
- } else {
- plen = max(qdisc_pkt_len(skb), q->quantum);
- if (f->credit > 0)
- goto out;
+ /* If EDT time was provided for this skb, we need to
+ * update f->time_next_packet only if this qdisc enforces
+ * a flow max rate.
+ */
+ if (!skb->tstamp) {
+ if (skb->sk)
+ rate = min(skb->sk->sk_pacing_rate, rate);
+
+ if (rate <= q->low_rate_threshold) {
+ f->credit = 0;
+ } else {
+ plen = max(plen, q->quantum);
+ if (f->credit > 0)
+ goto out;
+ }
}
if (rate != ~0UL) {
u64 len = (u64)plen * NSEC_PER_SEC;