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1 | /* |
2 | * net/sched/sch_mq.c Classful multiqueue dummy scheduler |
3 | * |
4 | * Copyright (c) 2009 Patrick McHardy <kaber@trash.net> |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * version 2 as published by the Free Software Foundation. |
9 | */ |
10 | |
11 | #include <linux/types.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/string.h> |
14 | #include <linux/errno.h> |
15 | #include <linux/skbuff.h> |
16 | #include <net/netlink.h> |
17 | #include <net/pkt_sched.h> |
18 | |
19 | struct mq_sched { |
20 | struct Qdisc **qdiscs; |
21 | }; |
22 | |
23 | static void mq_destroy(struct Qdisc *sch) |
24 | { |
25 | struct net_device *dev = qdisc_dev(sch); |
26 | struct mq_sched *priv = qdisc_priv(sch); |
27 | unsigned int ntx; |
28 | |
29 | if (!priv->qdiscs) |
30 | return; |
31 | for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++) |
32 | qdisc_destroy(priv->qdiscs[ntx]); |
33 | kfree(priv->qdiscs); |
34 | } |
35 | |
36 | static int mq_init(struct Qdisc *sch, struct nlattr *opt) |
37 | { |
38 | struct net_device *dev = qdisc_dev(sch); |
39 | struct mq_sched *priv = qdisc_priv(sch); |
40 | struct netdev_queue *dev_queue; |
41 | struct Qdisc *qdisc; |
42 | unsigned int ntx; |
43 | |
44 | if (sch->parent != TC_H_ROOT) |
45 | return -EOPNOTSUPP; |
46 | |
47 | if (!netif_is_multiqueue(dev)) |
48 | return -EOPNOTSUPP; |
49 | |
50 | /* pre-allocate qdiscs, attachment can't fail */ |
51 | priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]), |
52 | GFP_KERNEL); |
53 | if (priv->qdiscs == NULL) |
54 | return -ENOMEM; |
55 | |
56 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
57 | dev_queue = netdev_get_tx_queue(dev, ntx); |
58 | qdisc = qdisc_create_dflt(dev, dev_queue, &pfifo_fast_ops, |
59 | TC_H_MAKE(TC_H_MAJ(sch->handle), |
60 | TC_H_MIN(ntx + 1))); |
61 | if (qdisc == NULL) |
62 | goto err; |
63 | qdisc->flags |= TCQ_F_CAN_BYPASS; |
64 | priv->qdiscs[ntx] = qdisc; |
65 | } |
66 | |
67 | sch->flags |= TCQ_F_MQROOT; |
68 | return 0; |
69 | |
70 | err: |
71 | mq_destroy(sch); |
72 | return -ENOMEM; |
73 | } |
74 | |
75 | static void mq_attach(struct Qdisc *sch) |
76 | { |
77 | struct net_device *dev = qdisc_dev(sch); |
78 | struct mq_sched *priv = qdisc_priv(sch); |
79 | struct Qdisc *qdisc; |
80 | unsigned int ntx; |
81 | |
82 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
83 | qdisc = priv->qdiscs[ntx]; |
84 | qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc); |
85 | if (qdisc) |
86 | qdisc_destroy(qdisc); |
87 | } |
88 | kfree(priv->qdiscs); |
89 | priv->qdiscs = NULL; |
90 | } |
91 | |
92 | static int mq_dump(struct Qdisc *sch, struct sk_buff *skb) |
93 | { |
94 | struct net_device *dev = qdisc_dev(sch); |
95 | struct Qdisc *qdisc; |
96 | unsigned int ntx; |
97 | |
98 | sch->q.qlen = 0; |
99 | memset(&sch->bstats, 0, sizeof(sch->bstats)); |
100 | memset(&sch->qstats, 0, sizeof(sch->qstats)); |
101 | |
102 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
103 | qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; |
104 | spin_lock_bh(qdisc_lock(qdisc)); |
105 | sch->q.qlen += qdisc->q.qlen; |
106 | sch->bstats.bytes += qdisc->bstats.bytes; |
107 | sch->bstats.packets += qdisc->bstats.packets; |
108 | sch->qstats.qlen += qdisc->qstats.qlen; |
109 | sch->qstats.backlog += qdisc->qstats.backlog; |
110 | sch->qstats.drops += qdisc->qstats.drops; |
111 | sch->qstats.requeues += qdisc->qstats.requeues; |
112 | sch->qstats.overlimits += qdisc->qstats.overlimits; |
113 | spin_unlock_bh(qdisc_lock(qdisc)); |
114 | } |
115 | return 0; |
116 | } |
117 | |
118 | static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl) |
119 | { |
120 | struct net_device *dev = qdisc_dev(sch); |
121 | unsigned long ntx = cl - 1; |
122 | |
123 | if (ntx >= dev->num_tx_queues) |
124 | return NULL; |
125 | return netdev_get_tx_queue(dev, ntx); |
126 | } |
127 | |
128 | static struct netdev_queue *mq_select_queue(struct Qdisc *sch, |
129 | struct tcmsg *tcm) |
130 | { |
131 | unsigned int ntx = TC_H_MIN(tcm->tcm_parent); |
132 | struct netdev_queue *dev_queue = mq_queue_get(sch, ntx); |
133 | |
134 | if (!dev_queue) { |
135 | struct net_device *dev = qdisc_dev(sch); |
136 | |
137 | return netdev_get_tx_queue(dev, 0); |
138 | } |
139 | return dev_queue; |
140 | } |
141 | |
142 | static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, |
143 | struct Qdisc **old) |
144 | { |
145 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
146 | struct net_device *dev = qdisc_dev(sch); |
147 | |
148 | if (dev->flags & IFF_UP) |
149 | dev_deactivate(dev); |
150 | |
151 | *old = dev_graft_qdisc(dev_queue, new); |
152 | |
153 | if (dev->flags & IFF_UP) |
154 | dev_activate(dev); |
155 | return 0; |
156 | } |
157 | |
158 | static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) |
159 | { |
160 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
161 | |
162 | return dev_queue->qdisc_sleeping; |
163 | } |
164 | |
165 | static unsigned long mq_get(struct Qdisc *sch, u32 classid) |
166 | { |
167 | unsigned int ntx = TC_H_MIN(classid); |
168 | |
169 | if (!mq_queue_get(sch, ntx)) |
170 | return 0; |
171 | return ntx; |
172 | } |
173 | |
174 | static void mq_put(struct Qdisc *sch, unsigned long cl) |
175 | { |
176 | return; |
177 | } |
178 | |
179 | static int mq_dump_class(struct Qdisc *sch, unsigned long cl, |
180 | struct sk_buff *skb, struct tcmsg *tcm) |
181 | { |
182 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
183 | |
184 | tcm->tcm_parent = TC_H_ROOT; |
185 | tcm->tcm_handle |= TC_H_MIN(cl); |
186 | tcm->tcm_info = dev_queue->qdisc_sleeping->handle; |
187 | return 0; |
188 | } |
189 | |
190 | static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
191 | struct gnet_dump *d) |
192 | { |
193 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
194 | |
195 | sch = dev_queue->qdisc_sleeping; |
196 | sch->qstats.qlen = sch->q.qlen; |
197 | if (gnet_stats_copy_basic(d, &sch->bstats) < 0 || |
198 | gnet_stats_copy_queue(d, &sch->qstats) < 0) |
199 | return -1; |
200 | return 0; |
201 | } |
202 | |
203 | static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
204 | { |
205 | struct net_device *dev = qdisc_dev(sch); |
206 | unsigned int ntx; |
207 | |
208 | if (arg->stop) |
209 | return; |
210 | |
211 | arg->count = arg->skip; |
212 | for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) { |
213 | if (arg->fn(sch, ntx + 1, arg) < 0) { |
214 | arg->stop = 1; |
215 | break; |
216 | } |
217 | arg->count++; |
218 | } |
219 | } |
220 | |
221 | static const struct Qdisc_class_ops mq_class_ops = { |
222 | .select_queue = mq_select_queue, |
223 | .graft = mq_graft, |
224 | .leaf = mq_leaf, |
225 | .get = mq_get, |
226 | .put = mq_put, |
227 | .walk = mq_walk, |
228 | .dump = mq_dump_class, |
229 | .dump_stats = mq_dump_class_stats, |
230 | }; |
231 | |
232 | struct Qdisc_ops mq_qdisc_ops __read_mostly = { |
233 | .cl_ops = &mq_class_ops, |
234 | .id = "mq", |
235 | .priv_size = sizeof(struct mq_sched), |
236 | .init = mq_init, |
237 | .destroy = mq_destroy, |
238 | .attach = mq_attach, |
239 | .dump = mq_dump, |
240 | .owner = THIS_MODULE, |
241 | }; |
242 |
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