diff options
| -rw-r--r-- | include/uapi/linux/pkt_sched.h | 3 | ||||
| -rw-r--r-- | net/sched/sch_fq_codel.c | 27 |
2 files changed, 27 insertions, 3 deletions
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h index a11afecd4482..2382eed50278 100644 --- a/include/uapi/linux/pkt_sched.h +++ b/include/uapi/linux/pkt_sched.h @@ -719,6 +719,7 @@ enum { TCA_FQ_CODEL_QUANTUM, TCA_FQ_CODEL_CE_THRESHOLD, TCA_FQ_CODEL_DROP_BATCH_SIZE, + TCA_FQ_CODEL_MEMORY_LIMIT, __TCA_FQ_CODEL_MAX }; @@ -743,6 +744,8 @@ struct tc_fq_codel_qd_stats { __u32 new_flows_len; /* count of flows in new list */ __u32 old_flows_len; /* count of flows in old list */ __u32 ce_mark; /* packets above ce_threshold */ + __u32 memory_usage; /* in bytes */ + __u32 drop_overmemory; }; struct tc_fq_codel_cl_stats { diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c index e7b42b0d5145..bb8bd9314629 100644 --- a/net/sched/sch_fq_codel.c +++ b/net/sched/sch_fq_codel.c @@ -60,8 +60,11 @@ struct fq_codel_sched_data { u32 perturbation; /* hash perturbation */ u32 quantum; /* psched_mtu(qdisc_dev(sch)); */ u32 drop_batch_size; + u32 memory_limit; struct codel_params cparams; struct codel_stats cstats; + u32 memory_usage; + u32 drop_overmemory; u32 drop_overlimit; u32 new_flow_count; @@ -143,6 +146,7 @@ static unsigned int fq_codel_drop(struct Qdisc *sch, unsigned int max_packets) unsigned int maxbacklog = 0, idx = 0, i, len; struct fq_codel_flow *flow; unsigned int threshold; + unsigned int mem = 0; /* Queue is full! Find the fat flow and drop packet(s) from it. * This might sound expensive, but with 1024 flows, we scan @@ -167,11 +171,13 @@ static unsigned int fq_codel_drop(struct Qdisc *sch, unsigned int max_packets) do { skb = dequeue_head(flow); len += qdisc_pkt_len(skb); + mem += skb->truesize; kfree_skb(skb); } while (++i < max_packets && len < threshold); flow->dropped += i; q->backlogs[idx] -= len; + q->memory_usage -= mem; sch->qstats.drops += i; sch->qstats.backlog -= len; sch->q.qlen -= i; @@ -193,6 +199,7 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch) unsigned int idx, prev_backlog, prev_qlen; struct fq_codel_flow *flow; int uninitialized_var(ret); + bool memory_limited; idx = fq_codel_classify(skb, sch, &ret); if (idx == 0) { @@ -215,7 +222,9 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch) flow->deficit = q->quantum; flow->dropped = 0; } - if (++sch->q.qlen <= sch->limit) + q->memory_usage += skb->truesize; + memory_limited = q->memory_usage > q->memory_limit; + if (++sch->q.qlen <= sch->limit && !memory_limited) return NET_XMIT_SUCCESS; prev_backlog = sch->qstats.backlog; @@ -229,7 +238,8 @@ static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch) ret = fq_codel_drop(sch, q->drop_batch_size); q->drop_overlimit += prev_qlen - sch->q.qlen; - + if (memory_limited) + q->drop_overmemory += prev_qlen - sch->q.qlen; /* As we dropped packet(s), better let upper stack know this */ qdisc_tree_reduce_backlog(sch, prev_qlen - sch->q.qlen, prev_backlog - sch->qstats.backlog); @@ -308,6 +318,7 @@ begin: list_del_init(&flow->flowchain); goto begin; } + q->memory_usage -= skb->truesize; qdisc_bstats_update(sch, skb); flow->deficit -= qdisc_pkt_len(skb); /* We cant call qdisc_tree_reduce_backlog() if our qlen is 0, @@ -355,6 +366,7 @@ static const struct nla_policy fq_codel_policy[TCA_FQ_CODEL_MAX + 1] = { [TCA_FQ_CODEL_QUANTUM] = { .type = NLA_U32 }, [TCA_FQ_CODEL_CE_THRESHOLD] = { .type = NLA_U32 }, [TCA_FQ_CODEL_DROP_BATCH_SIZE] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_MEMORY_LIMIT] = { .type = NLA_U32 }, }; static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt) @@ -409,7 +421,11 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt) if (tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]) q->drop_batch_size = min(1U, nla_get_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE])); - while (sch->q.qlen > sch->limit) { + if (tb[TCA_FQ_CODEL_MEMORY_LIMIT]) + q->memory_limit = min(1U << 31, nla_get_u32(tb[TCA_FQ_CODEL_MEMORY_LIMIT])); + + while (sch->q.qlen > sch->limit || + q->memory_usage > q->memory_limit) { struct sk_buff *skb = fq_codel_dequeue(sch); q->cstats.drop_len += qdisc_pkt_len(skb); @@ -454,6 +470,7 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt) sch->limit = 10*1024; q->flows_cnt = 1024; + q->memory_limit = 32 << 20; /* 32 MBytes */ q->drop_batch_size = 64; q->quantum = psched_mtu(qdisc_dev(sch)); q->perturbation = prandom_u32(); @@ -515,6 +532,8 @@ static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb) q->quantum) || nla_put_u32(skb, TCA_FQ_CODEL_DROP_BATCH_SIZE, q->drop_batch_size) || + nla_put_u32(skb, TCA_FQ_CODEL_MEMORY_LIMIT, + q->memory_limit) || nla_put_u32(skb, TCA_FQ_CODEL_FLOWS, q->flows_cnt)) goto nla_put_failure; @@ -543,6 +562,8 @@ static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d) st.qdisc_stats.ecn_mark = q->cstats.ecn_mark; st.qdisc_stats.new_flow_count = q->new_flow_count; st.qdisc_stats.ce_mark = q->cstats.ce_mark; + st.qdisc_stats.memory_usage = q->memory_usage; + st.qdisc_stats.drop_overmemory = q->drop_overmemory; list_for_each(pos, &q->new_flows) st.qdisc_stats.new_flows_len++; |