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| author | Eric Dumazet <edumazet@google.com> | 2013-10-08 15:16:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-08 21:54:01 -0400 |
| commit | 7eec4174ff29cd42f2acfae8112f51c228545d40 (patch) | |
| tree | 435e9d12eec1944c4302d95cedc7fa46deb73a04 /net/sched | |
| parent | 2b1f18a4d6ae8057a93e736a34cdcca925279403 (diff) | |
| download | linux-7eec4174ff29cd42f2acfae8112f51c228545d40.tar.gz linux-7eec4174ff29cd42f2acfae8112f51c228545d40.tar.bz2 linux-7eec4174ff29cd42f2acfae8112f51c228545d40.zip | |
pkt_sched: fq: fix non TCP flows pacing
Steinar reported FQ pacing was not working for UDP flows.
It looks like the initial sk->sk_pacing_rate value of 0 was
a wrong choice. We should init it to ~0U (unlimited)
Then, TCA_FQ_FLOW_DEFAULT_RATE should be removed because it makes
no real sense. The default rate is really unlimited, and we
need to avoid a zero divide.
Reported-by: Steinar H. Gunderson <sesse@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_fq.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c index 48501a2baf75..a9dfdda9ed1d 100644 --- a/net/sched/sch_fq.c +++ b/net/sched/sch_fq.c @@ -472,20 +472,16 @@ begin: if (f->credit > 0 || !q->rate_enable) goto out; - if (skb->sk && skb->sk->sk_state != TCP_TIME_WAIT) { - rate = skb->sk->sk_pacing_rate ?: q->flow_default_rate; + rate = q->flow_max_rate; + if (skb->sk && skb->sk->sk_state != TCP_TIME_WAIT) + rate = min(skb->sk->sk_pacing_rate, rate); - rate = min(rate, q->flow_max_rate); - } else { - rate = q->flow_max_rate; - if (rate == ~0U) - goto out; - } - if (rate) { + if (rate != ~0U) { u32 plen = max(qdisc_pkt_len(skb), q->quantum); u64 len = (u64)plen * NSEC_PER_SEC; - do_div(len, rate); + if (likely(rate)) + do_div(len, rate); /* Since socket rate can change later, * clamp the delay to 125 ms. * TODO: maybe segment the too big skb, as in commit @@ -735,12 +731,14 @@ static int fq_dump(struct Qdisc *sch, struct sk_buff *skb) if (opts == NULL) goto nla_put_failure; + /* TCA_FQ_FLOW_DEFAULT_RATE is not used anymore, + * do not bother giving its value + */ if (nla_put_u32(skb, TCA_FQ_PLIMIT, sch->limit) || nla_put_u32(skb, TCA_FQ_FLOW_PLIMIT, q->flow_plimit) || nla_put_u32(skb, TCA_FQ_QUANTUM, q->quantum) || nla_put_u32(skb, TCA_FQ_INITIAL_QUANTUM, q->initial_quantum) || nla_put_u32(skb, TCA_FQ_RATE_ENABLE, q->rate_enable) || - nla_put_u32(skb, TCA_FQ_FLOW_DEFAULT_RATE, q->flow_default_rate) || nla_put_u32(skb, TCA_FQ_FLOW_MAX_RATE, q->flow_max_rate) || nla_put_u32(skb, TCA_FQ_BUCKETS_LOG, q->fq_trees_log)) goto nla_put_failure; |