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cd68ddd4c2
Currently, we hold a max of sch->limit -1 number of packets instead of sch->limit packets. Fix this off-by-one error. Signed-off-by: Vijay Subramanian <subramanian.vijay@gmail.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
627 lines
16 KiB
C
627 lines
16 KiB
C
/*
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* Fair Queue CoDel discipline
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Copyright (C) 2012 Eric Dumazet <edumazet@google.com>
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/string.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/flow_keys.h>
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#include <net/codel.h>
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/* Fair Queue CoDel.
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*
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* Principles :
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* Packets are classified (internal classifier or external) on flows.
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* This is a Stochastic model (as we use a hash, several flows
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* might be hashed on same slot)
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* Each flow has a CoDel managed queue.
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* Flows are linked onto two (Round Robin) lists,
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* so that new flows have priority on old ones.
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*
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* For a given flow, packets are not reordered (CoDel uses a FIFO)
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* head drops only.
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* ECN capability is on by default.
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* Low memory footprint (64 bytes per flow)
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*/
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struct fq_codel_flow {
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struct sk_buff *head;
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struct sk_buff *tail;
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struct list_head flowchain;
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int deficit;
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u32 dropped; /* number of drops (or ECN marks) on this flow */
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struct codel_vars cvars;
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}; /* please try to keep this structure <= 64 bytes */
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struct fq_codel_sched_data {
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struct tcf_proto *filter_list; /* optional external classifier */
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struct fq_codel_flow *flows; /* Flows table [flows_cnt] */
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u32 *backlogs; /* backlog table [flows_cnt] */
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u32 flows_cnt; /* number of flows */
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u32 perturbation; /* hash perturbation */
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u32 quantum; /* psched_mtu(qdisc_dev(sch)); */
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struct codel_params cparams;
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struct codel_stats cstats;
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u32 drop_overlimit;
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u32 new_flow_count;
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struct list_head new_flows; /* list of new flows */
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struct list_head old_flows; /* list of old flows */
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};
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static unsigned int fq_codel_hash(const struct fq_codel_sched_data *q,
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const struct sk_buff *skb)
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{
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struct flow_keys keys;
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unsigned int hash;
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skb_flow_dissect(skb, &keys);
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hash = jhash_3words((__force u32)keys.dst,
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(__force u32)keys.src ^ keys.ip_proto,
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(__force u32)keys.ports, q->perturbation);
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return ((u64)hash * q->flows_cnt) >> 32;
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}
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static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch,
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int *qerr)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct tcf_result res;
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int result;
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if (TC_H_MAJ(skb->priority) == sch->handle &&
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TC_H_MIN(skb->priority) > 0 &&
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TC_H_MIN(skb->priority) <= q->flows_cnt)
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return TC_H_MIN(skb->priority);
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if (!q->filter_list)
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return fq_codel_hash(q, skb) + 1;
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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result = tc_classify(skb, q->filter_list, &res);
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if (result >= 0) {
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#ifdef CONFIG_NET_CLS_ACT
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switch (result) {
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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case TC_ACT_SHOT:
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return 0;
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}
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#endif
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if (TC_H_MIN(res.classid) <= q->flows_cnt)
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return TC_H_MIN(res.classid);
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}
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return 0;
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}
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/* helper functions : might be changed when/if skb use a standard list_head */
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/* remove one skb from head of slot queue */
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static inline struct sk_buff *dequeue_head(struct fq_codel_flow *flow)
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{
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struct sk_buff *skb = flow->head;
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flow->head = skb->next;
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skb->next = NULL;
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return skb;
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}
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/* add skb to flow queue (tail add) */
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static inline void flow_queue_add(struct fq_codel_flow *flow,
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struct sk_buff *skb)
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{
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if (flow->head == NULL)
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flow->head = skb;
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else
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flow->tail->next = skb;
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flow->tail = skb;
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skb->next = NULL;
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}
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static unsigned int fq_codel_drop(struct Qdisc *sch)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct sk_buff *skb;
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unsigned int maxbacklog = 0, idx = 0, i, len;
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struct fq_codel_flow *flow;
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/* Queue is full! Find the fat flow and drop packet from it.
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* This might sound expensive, but with 1024 flows, we scan
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* 4KB of memory, and we dont need to handle a complex tree
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* in fast path (packet queue/enqueue) with many cache misses.
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*/
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for (i = 0; i < q->flows_cnt; i++) {
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if (q->backlogs[i] > maxbacklog) {
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maxbacklog = q->backlogs[i];
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idx = i;
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}
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}
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flow = &q->flows[idx];
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skb = dequeue_head(flow);
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len = qdisc_pkt_len(skb);
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q->backlogs[idx] -= len;
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kfree_skb(skb);
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sch->q.qlen--;
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sch->qstats.drops++;
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sch->qstats.backlog -= len;
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flow->dropped++;
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return idx;
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}
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static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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unsigned int idx;
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struct fq_codel_flow *flow;
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int uninitialized_var(ret);
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idx = fq_codel_classify(skb, sch, &ret);
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if (idx == 0) {
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if (ret & __NET_XMIT_BYPASS)
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sch->qstats.drops++;
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kfree_skb(skb);
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return ret;
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}
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idx--;
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codel_set_enqueue_time(skb);
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flow = &q->flows[idx];
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flow_queue_add(flow, skb);
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q->backlogs[idx] += qdisc_pkt_len(skb);
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sch->qstats.backlog += qdisc_pkt_len(skb);
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if (list_empty(&flow->flowchain)) {
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list_add_tail(&flow->flowchain, &q->new_flows);
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q->new_flow_count++;
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flow->deficit = q->quantum;
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flow->dropped = 0;
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}
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if (++sch->q.qlen <= sch->limit)
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return NET_XMIT_SUCCESS;
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q->drop_overlimit++;
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/* Return Congestion Notification only if we dropped a packet
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* from this flow.
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*/
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if (fq_codel_drop(sch) == idx)
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return NET_XMIT_CN;
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/* As we dropped a packet, better let upper stack know this */
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qdisc_tree_decrease_qlen(sch, 1);
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return NET_XMIT_SUCCESS;
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}
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/* This is the specific function called from codel_dequeue()
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* to dequeue a packet from queue. Note: backlog is handled in
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* codel, we dont need to reduce it here.
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*/
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static struct sk_buff *dequeue(struct codel_vars *vars, struct Qdisc *sch)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct fq_codel_flow *flow;
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struct sk_buff *skb = NULL;
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flow = container_of(vars, struct fq_codel_flow, cvars);
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if (flow->head) {
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skb = dequeue_head(flow);
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q->backlogs[flow - q->flows] -= qdisc_pkt_len(skb);
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sch->q.qlen--;
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}
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return skb;
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}
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static struct sk_buff *fq_codel_dequeue(struct Qdisc *sch)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct sk_buff *skb;
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struct fq_codel_flow *flow;
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struct list_head *head;
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u32 prev_drop_count, prev_ecn_mark;
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begin:
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head = &q->new_flows;
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if (list_empty(head)) {
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head = &q->old_flows;
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if (list_empty(head))
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return NULL;
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}
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flow = list_first_entry(head, struct fq_codel_flow, flowchain);
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if (flow->deficit <= 0) {
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flow->deficit += q->quantum;
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list_move_tail(&flow->flowchain, &q->old_flows);
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goto begin;
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}
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prev_drop_count = q->cstats.drop_count;
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prev_ecn_mark = q->cstats.ecn_mark;
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skb = codel_dequeue(sch, &q->cparams, &flow->cvars, &q->cstats,
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dequeue);
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flow->dropped += q->cstats.drop_count - prev_drop_count;
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flow->dropped += q->cstats.ecn_mark - prev_ecn_mark;
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if (!skb) {
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/* force a pass through old_flows to prevent starvation */
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if ((head == &q->new_flows) && !list_empty(&q->old_flows))
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list_move_tail(&flow->flowchain, &q->old_flows);
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else
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list_del_init(&flow->flowchain);
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goto begin;
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}
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qdisc_bstats_update(sch, skb);
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flow->deficit -= qdisc_pkt_len(skb);
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/* We cant call qdisc_tree_decrease_qlen() if our qlen is 0,
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* or HTB crashes. Defer it for next round.
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*/
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if (q->cstats.drop_count && sch->q.qlen) {
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qdisc_tree_decrease_qlen(sch, q->cstats.drop_count);
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q->cstats.drop_count = 0;
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}
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return skb;
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}
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static void fq_codel_reset(struct Qdisc *sch)
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{
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struct sk_buff *skb;
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while ((skb = fq_codel_dequeue(sch)) != NULL)
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kfree_skb(skb);
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}
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static const struct nla_policy fq_codel_policy[TCA_FQ_CODEL_MAX + 1] = {
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[TCA_FQ_CODEL_TARGET] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_LIMIT] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_INTERVAL] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_ECN] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_FLOWS] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_QUANTUM] = { .type = NLA_U32 },
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};
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static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct nlattr *tb[TCA_FQ_CODEL_MAX + 1];
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int err;
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if (!opt)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_FQ_CODEL_MAX, opt, fq_codel_policy);
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if (err < 0)
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return err;
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if (tb[TCA_FQ_CODEL_FLOWS]) {
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if (q->flows)
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return -EINVAL;
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q->flows_cnt = nla_get_u32(tb[TCA_FQ_CODEL_FLOWS]);
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if (!q->flows_cnt ||
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q->flows_cnt > 65536)
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return -EINVAL;
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}
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sch_tree_lock(sch);
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if (tb[TCA_FQ_CODEL_TARGET]) {
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u64 target = nla_get_u32(tb[TCA_FQ_CODEL_TARGET]);
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q->cparams.target = (target * NSEC_PER_USEC) >> CODEL_SHIFT;
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}
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if (tb[TCA_FQ_CODEL_INTERVAL]) {
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u64 interval = nla_get_u32(tb[TCA_FQ_CODEL_INTERVAL]);
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q->cparams.interval = (interval * NSEC_PER_USEC) >> CODEL_SHIFT;
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}
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if (tb[TCA_FQ_CODEL_LIMIT])
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sch->limit = nla_get_u32(tb[TCA_FQ_CODEL_LIMIT]);
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if (tb[TCA_FQ_CODEL_ECN])
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q->cparams.ecn = !!nla_get_u32(tb[TCA_FQ_CODEL_ECN]);
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if (tb[TCA_FQ_CODEL_QUANTUM])
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q->quantum = max(256U, nla_get_u32(tb[TCA_FQ_CODEL_QUANTUM]));
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while (sch->q.qlen > sch->limit) {
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struct sk_buff *skb = fq_codel_dequeue(sch);
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kfree_skb(skb);
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q->cstats.drop_count++;
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}
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qdisc_tree_decrease_qlen(sch, q->cstats.drop_count);
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q->cstats.drop_count = 0;
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sch_tree_unlock(sch);
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return 0;
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}
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static void *fq_codel_zalloc(size_t sz)
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{
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void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
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if (!ptr)
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ptr = vzalloc(sz);
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return ptr;
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}
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static void fq_codel_free(void *addr)
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{
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if (addr) {
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if (is_vmalloc_addr(addr))
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vfree(addr);
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else
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kfree(addr);
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}
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}
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static void fq_codel_destroy(struct Qdisc *sch)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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tcf_destroy_chain(&q->filter_list);
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fq_codel_free(q->backlogs);
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fq_codel_free(q->flows);
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}
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static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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int i;
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sch->limit = 10*1024;
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q->flows_cnt = 1024;
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q->quantum = psched_mtu(qdisc_dev(sch));
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q->perturbation = net_random();
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INIT_LIST_HEAD(&q->new_flows);
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INIT_LIST_HEAD(&q->old_flows);
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codel_params_init(&q->cparams);
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codel_stats_init(&q->cstats);
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q->cparams.ecn = true;
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if (opt) {
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int err = fq_codel_change(sch, opt);
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if (err)
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return err;
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}
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if (!q->flows) {
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q->flows = fq_codel_zalloc(q->flows_cnt *
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sizeof(struct fq_codel_flow));
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if (!q->flows)
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return -ENOMEM;
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q->backlogs = fq_codel_zalloc(q->flows_cnt * sizeof(u32));
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if (!q->backlogs) {
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fq_codel_free(q->flows);
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return -ENOMEM;
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}
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for (i = 0; i < q->flows_cnt; i++) {
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struct fq_codel_flow *flow = q->flows + i;
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INIT_LIST_HEAD(&flow->flowchain);
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codel_vars_init(&flow->cvars);
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}
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}
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if (sch->limit >= 1)
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sch->flags |= TCQ_F_CAN_BYPASS;
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else
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sch->flags &= ~TCQ_F_CAN_BYPASS;
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return 0;
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}
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static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct nlattr *opts;
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opts = nla_nest_start(skb, TCA_OPTIONS);
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if (opts == NULL)
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goto nla_put_failure;
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if (nla_put_u32(skb, TCA_FQ_CODEL_TARGET,
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codel_time_to_us(q->cparams.target)) ||
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nla_put_u32(skb, TCA_FQ_CODEL_LIMIT,
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sch->limit) ||
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nla_put_u32(skb, TCA_FQ_CODEL_INTERVAL,
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codel_time_to_us(q->cparams.interval)) ||
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nla_put_u32(skb, TCA_FQ_CODEL_ECN,
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q->cparams.ecn) ||
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nla_put_u32(skb, TCA_FQ_CODEL_QUANTUM,
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q->quantum) ||
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nla_put_u32(skb, TCA_FQ_CODEL_FLOWS,
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q->flows_cnt))
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goto nla_put_failure;
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nla_nest_end(skb, opts);
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return skb->len;
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nla_put_failure:
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return -1;
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}
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static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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struct tc_fq_codel_xstats st = {
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.type = TCA_FQ_CODEL_XSTATS_QDISC,
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};
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struct list_head *pos;
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st.qdisc_stats.maxpacket = q->cstats.maxpacket;
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st.qdisc_stats.drop_overlimit = q->drop_overlimit;
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st.qdisc_stats.ecn_mark = q->cstats.ecn_mark;
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st.qdisc_stats.new_flow_count = q->new_flow_count;
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list_for_each(pos, &q->new_flows)
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st.qdisc_stats.new_flows_len++;
|
|
|
|
list_for_each(pos, &q->old_flows)
|
|
st.qdisc_stats.old_flows_len++;
|
|
|
|
return gnet_stats_copy_app(d, &st, sizeof(st));
|
|
}
|
|
|
|
static struct Qdisc *fq_codel_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned long fq_codel_get(struct Qdisc *sch, u32 classid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long fq_codel_bind(struct Qdisc *sch, unsigned long parent,
|
|
u32 classid)
|
|
{
|
|
/* we cannot bypass queue discipline anymore */
|
|
sch->flags &= ~TCQ_F_CAN_BYPASS;
|
|
return 0;
|
|
}
|
|
|
|
static void fq_codel_put(struct Qdisc *q, unsigned long cl)
|
|
{
|
|
}
|
|
|
|
static struct tcf_proto **fq_codel_find_tcf(struct Qdisc *sch, unsigned long cl)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
|
|
if (cl)
|
|
return NULL;
|
|
return &q->filter_list;
|
|
}
|
|
|
|
static int fq_codel_dump_class(struct Qdisc *sch, unsigned long cl,
|
|
struct sk_buff *skb, struct tcmsg *tcm)
|
|
{
|
|
tcm->tcm_handle |= TC_H_MIN(cl);
|
|
return 0;
|
|
}
|
|
|
|
static int fq_codel_dump_class_stats(struct Qdisc *sch, unsigned long cl,
|
|
struct gnet_dump *d)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
u32 idx = cl - 1;
|
|
struct gnet_stats_queue qs = { 0 };
|
|
struct tc_fq_codel_xstats xstats;
|
|
|
|
if (idx < q->flows_cnt) {
|
|
const struct fq_codel_flow *flow = &q->flows[idx];
|
|
const struct sk_buff *skb = flow->head;
|
|
|
|
memset(&xstats, 0, sizeof(xstats));
|
|
xstats.type = TCA_FQ_CODEL_XSTATS_CLASS;
|
|
xstats.class_stats.deficit = flow->deficit;
|
|
xstats.class_stats.ldelay =
|
|
codel_time_to_us(flow->cvars.ldelay);
|
|
xstats.class_stats.count = flow->cvars.count;
|
|
xstats.class_stats.lastcount = flow->cvars.lastcount;
|
|
xstats.class_stats.dropping = flow->cvars.dropping;
|
|
if (flow->cvars.dropping) {
|
|
codel_tdiff_t delta = flow->cvars.drop_next -
|
|
codel_get_time();
|
|
|
|
xstats.class_stats.drop_next = (delta >= 0) ?
|
|
codel_time_to_us(delta) :
|
|
-codel_time_to_us(-delta);
|
|
}
|
|
while (skb) {
|
|
qs.qlen++;
|
|
skb = skb->next;
|
|
}
|
|
qs.backlog = q->backlogs[idx];
|
|
qs.drops = flow->dropped;
|
|
}
|
|
if (gnet_stats_copy_queue(d, &qs) < 0)
|
|
return -1;
|
|
if (idx < q->flows_cnt)
|
|
return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
|
|
return 0;
|
|
}
|
|
|
|
static void fq_codel_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
unsigned int i;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (i = 0; i < q->flows_cnt; i++) {
|
|
if (list_empty(&q->flows[i].flowchain) ||
|
|
arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(sch, i + 1, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static const struct Qdisc_class_ops fq_codel_class_ops = {
|
|
.leaf = fq_codel_leaf,
|
|
.get = fq_codel_get,
|
|
.put = fq_codel_put,
|
|
.tcf_chain = fq_codel_find_tcf,
|
|
.bind_tcf = fq_codel_bind,
|
|
.unbind_tcf = fq_codel_put,
|
|
.dump = fq_codel_dump_class,
|
|
.dump_stats = fq_codel_dump_class_stats,
|
|
.walk = fq_codel_walk,
|
|
};
|
|
|
|
static struct Qdisc_ops fq_codel_qdisc_ops __read_mostly = {
|
|
.cl_ops = &fq_codel_class_ops,
|
|
.id = "fq_codel",
|
|
.priv_size = sizeof(struct fq_codel_sched_data),
|
|
.enqueue = fq_codel_enqueue,
|
|
.dequeue = fq_codel_dequeue,
|
|
.peek = qdisc_peek_dequeued,
|
|
.drop = fq_codel_drop,
|
|
.init = fq_codel_init,
|
|
.reset = fq_codel_reset,
|
|
.destroy = fq_codel_destroy,
|
|
.change = fq_codel_change,
|
|
.dump = fq_codel_dump,
|
|
.dump_stats = fq_codel_dump_stats,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init fq_codel_module_init(void)
|
|
{
|
|
return register_qdisc(&fq_codel_qdisc_ops);
|
|
}
|
|
|
|
static void __exit fq_codel_module_exit(void)
|
|
{
|
|
unregister_qdisc(&fq_codel_qdisc_ops);
|
|
}
|
|
|
|
module_init(fq_codel_module_init)
|
|
module_exit(fq_codel_module_exit)
|
|
MODULE_AUTHOR("Eric Dumazet");
|
|
MODULE_LICENSE("GPL");
|