mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Zhengchao Shao](/assets/img/avatar_default.png)
This reverts commit 494f5063b8
.
When the default qdisc is fq_codel, if the qdisc of dev_queue fails to be
inited during mqprio_init(), fq_codel_reset() is invoked to clear
resources. In this case, the flow is NULL, and it will cause gpf issue.
The process is as follows:
qdisc_create_dflt()
fq_codel_init()
...
q->flows_cnt = 1024;
...
q->flows = kvcalloc(...) --->failed, q->flows is NULL
...
qdisc_put()
...
fq_codel_reset()
...
flow = q->flows + i --->q->flows is NULL
The following is the Call Trace information:
general protection fault, probably for non-canonical address
0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
RIP: 0010:fq_codel_reset+0x14d/0x350
Call Trace:
<TASK>
qdisc_reset+0xed/0x6f0
qdisc_destroy+0x82/0x4c0
qdisc_put+0x9e/0xb0
qdisc_create_dflt+0x2c3/0x4a0
mqprio_init+0xa71/0x1760
qdisc_create+0x3eb/0x1000
tc_modify_qdisc+0x408/0x1720
rtnetlink_rcv_msg+0x38e/0xac0
netlink_rcv_skb+0x12d/0x3a0
netlink_unicast+0x4a2/0x740
netlink_sendmsg+0x826/0xcc0
sock_sendmsg+0xc5/0x100
____sys_sendmsg+0x583/0x690
___sys_sendmsg+0xe8/0x160
__sys_sendmsg+0xbf/0x160
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fd272b22d04
</TASK>
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
735 lines
19 KiB
C
735 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Fair Queue CoDel discipline
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*
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* Copyright (C) 2012,2015 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/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/pkt_cls.h>
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#include <net/codel.h>
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#include <net/codel_impl.h>
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#include <net/codel_qdisc.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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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 __rcu *filter_list; /* optional external classifier */
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struct tcf_block *block;
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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 quantum; /* psched_mtu(qdisc_dev(sch)); */
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u32 drop_batch_size;
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u32 memory_limit;
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struct codel_params cparams;
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struct codel_stats cstats;
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u32 memory_usage;
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u32 drop_overmemory;
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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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struct sk_buff *skb)
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{
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return reciprocal_scale(skb_get_hash(skb), q->flows_cnt);
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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_proto *filter;
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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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filter = rcu_dereference_bh(q->filter_list);
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if (!filter)
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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 = tcf_classify(skb, NULL, filter, &res, false);
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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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case TC_ACT_TRAP:
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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fallthrough;
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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_mark_not_on_list(skb);
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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, unsigned int max_packets,
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struct sk_buff **to_free)
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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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unsigned int threshold;
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unsigned int mem = 0;
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/* Queue is full! Find the fat flow and drop packet(s) 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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* In stress mode, we'll try to drop 64 packets from the flow,
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* amortizing this linear lookup to one cache line per drop.
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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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/* Our goal is to drop half of this fat flow backlog */
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threshold = maxbacklog >> 1;
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flow = &q->flows[idx];
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len = 0;
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i = 0;
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do {
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skb = dequeue_head(flow);
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len += qdisc_pkt_len(skb);
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mem += get_codel_cb(skb)->mem_usage;
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__qdisc_drop(skb, to_free);
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} while (++i < max_packets && len < threshold);
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/* Tell codel to increase its signal strength also */
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flow->cvars.count += i;
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q->backlogs[idx] -= len;
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q->memory_usage -= mem;
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sch->qstats.drops += i;
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sch->qstats.backlog -= len;
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sch->q.qlen -= i;
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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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struct sk_buff **to_free)
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{
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struct fq_codel_sched_data *q = qdisc_priv(sch);
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unsigned int idx, prev_backlog, prev_qlen;
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struct fq_codel_flow *flow;
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int ret;
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unsigned int pkt_len;
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bool memory_limited;
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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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qdisc_qstats_drop(sch);
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__qdisc_drop(skb, to_free);
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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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qdisc_qstats_backlog_inc(sch, 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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}
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get_codel_cb(skb)->mem_usage = skb->truesize;
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q->memory_usage += get_codel_cb(skb)->mem_usage;
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memory_limited = q->memory_usage > q->memory_limit;
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if (++sch->q.qlen <= sch->limit && !memory_limited)
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return NET_XMIT_SUCCESS;
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prev_backlog = sch->qstats.backlog;
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prev_qlen = sch->q.qlen;
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/* save this packet length as it might be dropped by fq_codel_drop() */
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pkt_len = qdisc_pkt_len(skb);
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/* fq_codel_drop() is quite expensive, as it performs a linear search
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* in q->backlogs[] to find a fat flow.
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* So instead of dropping a single packet, drop half of its backlog
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* with a 64 packets limit to not add a too big cpu spike here.
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*/
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ret = fq_codel_drop(sch, q->drop_batch_size, to_free);
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prev_qlen -= sch->q.qlen;
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prev_backlog -= sch->qstats.backlog;
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q->drop_overlimit += prev_qlen;
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if (memory_limited)
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q->drop_overmemory += prev_qlen;
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/* As we dropped packet(s), better let upper stack know this.
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* If we dropped a packet for this flow, return NET_XMIT_CN,
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* but in this case, our parents wont increase their backlogs.
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*/
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if (ret == idx) {
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qdisc_tree_reduce_backlog(sch, prev_qlen - 1,
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prev_backlog - pkt_len);
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return NET_XMIT_CN;
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}
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qdisc_tree_reduce_backlog(sch, prev_qlen, prev_backlog);
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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_func(struct codel_vars *vars, void *ctx)
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{
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struct Qdisc *sch = ctx;
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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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q->memory_usage -= get_codel_cb(skb)->mem_usage;
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sch->q.qlen--;
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sch->qstats.backlog -= qdisc_pkt_len(skb);
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}
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return skb;
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}
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static void drop_func(struct sk_buff *skb, void *ctx)
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{
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struct Qdisc *sch = ctx;
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kfree_skb(skb);
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qdisc_qstats_drop(sch);
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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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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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skb = codel_dequeue(sch, &sch->qstats.backlog, &q->cparams,
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&flow->cvars, &q->cstats, qdisc_pkt_len,
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codel_get_enqueue_time, drop_func, dequeue_func);
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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_reduce_backlog() 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_reduce_backlog(sch, q->cstats.drop_count,
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q->cstats.drop_len);
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q->cstats.drop_count = 0;
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q->cstats.drop_len = 0;
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}
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return skb;
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}
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static void fq_codel_flow_purge(struct fq_codel_flow *flow)
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{
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rtnl_kfree_skbs(flow->head, flow->tail);
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flow->head = NULL;
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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 fq_codel_sched_data *q = qdisc_priv(sch);
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int i;
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INIT_LIST_HEAD(&q->new_flows);
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INIT_LIST_HEAD(&q->old_flows);
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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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fq_codel_flow_purge(flow);
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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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memset(q->backlogs, 0, q->flows_cnt * sizeof(u32));
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q->memory_usage = 0;
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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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[TCA_FQ_CODEL_CE_THRESHOLD] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_DROP_BATCH_SIZE] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_MEMORY_LIMIT] = { .type = NLA_U32 },
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[TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR] = { .type = NLA_U8 },
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[TCA_FQ_CODEL_CE_THRESHOLD_MASK] = { .type = NLA_U8 },
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};
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static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt,
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struct netlink_ext_ack *extack)
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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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u32 quantum = 0;
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int err;
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err = nla_parse_nested_deprecated(tb, TCA_FQ_CODEL_MAX, opt,
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fq_codel_policy, NULL);
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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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if (tb[TCA_FQ_CODEL_QUANTUM]) {
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quantum = max(256U, nla_get_u32(tb[TCA_FQ_CODEL_QUANTUM]));
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if (quantum > FQ_CODEL_QUANTUM_MAX) {
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NL_SET_ERR_MSG(extack, "Invalid quantum");
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return -EINVAL;
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}
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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_CE_THRESHOLD]) {
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u64 val = nla_get_u32(tb[TCA_FQ_CODEL_CE_THRESHOLD]);
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q->cparams.ce_threshold = (val * NSEC_PER_USEC) >> CODEL_SHIFT;
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}
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if (tb[TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR])
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q->cparams.ce_threshold_selector = nla_get_u8(tb[TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR]);
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if (tb[TCA_FQ_CODEL_CE_THRESHOLD_MASK])
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q->cparams.ce_threshold_mask = nla_get_u8(tb[TCA_FQ_CODEL_CE_THRESHOLD_MASK]);
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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])
|
|
sch->limit = nla_get_u32(tb[TCA_FQ_CODEL_LIMIT]);
|
|
|
|
if (tb[TCA_FQ_CODEL_ECN])
|
|
q->cparams.ecn = !!nla_get_u32(tb[TCA_FQ_CODEL_ECN]);
|
|
|
|
if (quantum)
|
|
q->quantum = quantum;
|
|
|
|
if (tb[TCA_FQ_CODEL_DROP_BATCH_SIZE])
|
|
q->drop_batch_size = max(1U, nla_get_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]));
|
|
|
|
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);
|
|
rtnl_kfree_skbs(skb, skb);
|
|
q->cstats.drop_count++;
|
|
}
|
|
qdisc_tree_reduce_backlog(sch, q->cstats.drop_count, q->cstats.drop_len);
|
|
q->cstats.drop_count = 0;
|
|
q->cstats.drop_len = 0;
|
|
|
|
sch_tree_unlock(sch);
|
|
return 0;
|
|
}
|
|
|
|
static void fq_codel_destroy(struct Qdisc *sch)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
|
|
tcf_block_put(q->block);
|
|
kvfree(q->backlogs);
|
|
kvfree(q->flows);
|
|
}
|
|
|
|
static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
int i;
|
|
int err;
|
|
|
|
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));
|
|
INIT_LIST_HEAD(&q->new_flows);
|
|
INIT_LIST_HEAD(&q->old_flows);
|
|
codel_params_init(&q->cparams);
|
|
codel_stats_init(&q->cstats);
|
|
q->cparams.ecn = true;
|
|
q->cparams.mtu = psched_mtu(qdisc_dev(sch));
|
|
|
|
if (opt) {
|
|
err = fq_codel_change(sch, opt, extack);
|
|
if (err)
|
|
goto init_failure;
|
|
}
|
|
|
|
err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
|
|
if (err)
|
|
goto init_failure;
|
|
|
|
if (!q->flows) {
|
|
q->flows = kvcalloc(q->flows_cnt,
|
|
sizeof(struct fq_codel_flow),
|
|
GFP_KERNEL);
|
|
if (!q->flows) {
|
|
err = -ENOMEM;
|
|
goto init_failure;
|
|
}
|
|
q->backlogs = kvcalloc(q->flows_cnt, sizeof(u32), GFP_KERNEL);
|
|
if (!q->backlogs) {
|
|
err = -ENOMEM;
|
|
goto alloc_failure;
|
|
}
|
|
for (i = 0; i < q->flows_cnt; i++) {
|
|
struct fq_codel_flow *flow = q->flows + i;
|
|
|
|
INIT_LIST_HEAD(&flow->flowchain);
|
|
codel_vars_init(&flow->cvars);
|
|
}
|
|
}
|
|
if (sch->limit >= 1)
|
|
sch->flags |= TCQ_F_CAN_BYPASS;
|
|
else
|
|
sch->flags &= ~TCQ_F_CAN_BYPASS;
|
|
return 0;
|
|
|
|
alloc_failure:
|
|
kvfree(q->flows);
|
|
q->flows = NULL;
|
|
init_failure:
|
|
q->flows_cnt = 0;
|
|
return err;
|
|
}
|
|
|
|
static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
struct nlattr *opts;
|
|
|
|
opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
|
|
if (opts == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, TCA_FQ_CODEL_TARGET,
|
|
codel_time_to_us(q->cparams.target)) ||
|
|
nla_put_u32(skb, TCA_FQ_CODEL_LIMIT,
|
|
sch->limit) ||
|
|
nla_put_u32(skb, TCA_FQ_CODEL_INTERVAL,
|
|
codel_time_to_us(q->cparams.interval)) ||
|
|
nla_put_u32(skb, TCA_FQ_CODEL_ECN,
|
|
q->cparams.ecn) ||
|
|
nla_put_u32(skb, TCA_FQ_CODEL_QUANTUM,
|
|
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;
|
|
|
|
if (q->cparams.ce_threshold != CODEL_DISABLED_THRESHOLD) {
|
|
if (nla_put_u32(skb, TCA_FQ_CODEL_CE_THRESHOLD,
|
|
codel_time_to_us(q->cparams.ce_threshold)))
|
|
goto nla_put_failure;
|
|
if (nla_put_u8(skb, TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR, q->cparams.ce_threshold_selector))
|
|
goto nla_put_failure;
|
|
if (nla_put_u8(skb, TCA_FQ_CODEL_CE_THRESHOLD_MASK, q->cparams.ce_threshold_mask))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
return nla_nest_end(skb, opts);
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
struct tc_fq_codel_xstats st = {
|
|
.type = TCA_FQ_CODEL_XSTATS_QDISC,
|
|
};
|
|
struct list_head *pos;
|
|
|
|
st.qdisc_stats.maxpacket = q->cstats.maxpacket;
|
|
st.qdisc_stats.drop_overlimit = q->drop_overlimit;
|
|
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;
|
|
|
|
sch_tree_lock(sch);
|
|
list_for_each(pos, &q->new_flows)
|
|
st.qdisc_stats.new_flows_len++;
|
|
|
|
list_for_each(pos, &q->old_flows)
|
|
st.qdisc_stats.old_flows_len++;
|
|
sch_tree_unlock(sch);
|
|
|
|
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_find(struct Qdisc *sch, u32 classid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long fq_codel_bind(struct Qdisc *sch, unsigned long parent,
|
|
u32 classid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void fq_codel_unbind(struct Qdisc *q, unsigned long cl)
|
|
{
|
|
}
|
|
|
|
static struct tcf_block *fq_codel_tcf_block(struct Qdisc *sch, unsigned long cl,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct fq_codel_sched_data *q = qdisc_priv(sch);
|
|
|
|
if (cl)
|
|
return NULL;
|
|
return q->block;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
}
|
|
if (flow->head) {
|
|
sch_tree_lock(sch);
|
|
skb = flow->head;
|
|
while (skb) {
|
|
qs.qlen++;
|
|
skb = skb->next;
|
|
}
|
|
sch_tree_unlock(sch);
|
|
}
|
|
qs.backlog = q->backlogs[idx];
|
|
qs.drops = 0;
|
|
}
|
|
if (gnet_stats_copy_queue(d, NULL, &qs, qs.qlen) < 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++;
|
|
continue;
|
|
}
|
|
if (!tc_qdisc_stats_dump(sch, i + 1, arg))
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const struct Qdisc_class_ops fq_codel_class_ops = {
|
|
.leaf = fq_codel_leaf,
|
|
.find = fq_codel_find,
|
|
.tcf_block = fq_codel_tcf_block,
|
|
.bind_tcf = fq_codel_bind,
|
|
.unbind_tcf = fq_codel_unbind,
|
|
.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,
|
|
.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");
|
|
MODULE_DESCRIPTION("Fair Queue CoDel discipline");
|