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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/slab.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/export.h> |
15 | #include <linux/string.h> |
16 | #include <linux/errno.h> |
17 | #include <linux/skbuff.h> |
18 | #include <net/netlink.h> |
19 | #include <net/pkt_sched.h> |
20 | |
21 | struct mq_sched { |
22 | struct Qdisc **qdiscs; |
23 | }; |
24 | |
25 | static void mq_destroy(struct Qdisc *sch) |
26 | { |
27 | struct net_device *dev = qdisc_dev(sch); |
28 | struct mq_sched *priv = qdisc_priv(sch); |
29 | unsigned int ntx; |
30 | |
31 | if (!priv->qdiscs) |
32 | return; |
33 | for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++) |
34 | qdisc_destroy(priv->qdiscs[ntx]); |
35 | kfree(priv->qdiscs); |
36 | } |
37 | |
38 | static int mq_init(struct Qdisc *sch, struct nlattr *opt) |
39 | { |
40 | struct net_device *dev = qdisc_dev(sch); |
41 | struct mq_sched *priv = qdisc_priv(sch); |
42 | struct netdev_queue *dev_queue; |
43 | struct Qdisc *qdisc; |
44 | unsigned int ntx; |
45 | |
46 | if (sch->parent != TC_H_ROOT) |
47 | return -EOPNOTSUPP; |
48 | |
49 | if (!netif_is_multiqueue(dev)) |
50 | return -EOPNOTSUPP; |
51 | |
52 | /* pre-allocate qdiscs, attachment can't fail */ |
53 | priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]), |
54 | GFP_KERNEL); |
55 | if (priv->qdiscs == NULL) |
56 | return -ENOMEM; |
57 | |
58 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
59 | dev_queue = netdev_get_tx_queue(dev, ntx); |
60 | qdisc = qdisc_create_dflt(dev_queue, default_qdisc_ops, |
61 | TC_H_MAKE(TC_H_MAJ(sch->handle), |
62 | TC_H_MIN(ntx + 1))); |
63 | if (qdisc == NULL) |
64 | goto err; |
65 | priv->qdiscs[ntx] = qdisc; |
66 | qdisc->flags |= TCQ_F_ONETXQUEUE; |
67 | } |
68 | |
69 | sch->flags |= TCQ_F_MQROOT; |
70 | return 0; |
71 | |
72 | err: |
73 | mq_destroy(sch); |
74 | return -ENOMEM; |
75 | } |
76 | |
77 | static void mq_attach(struct Qdisc *sch) |
78 | { |
79 | struct net_device *dev = qdisc_dev(sch); |
80 | struct mq_sched *priv = qdisc_priv(sch); |
81 | struct Qdisc *qdisc, *old; |
82 | unsigned int ntx; |
83 | |
84 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
85 | qdisc = priv->qdiscs[ntx]; |
86 | old = dev_graft_qdisc(qdisc->dev_queue, qdisc); |
87 | if (old) |
88 | qdisc_destroy(old); |
89 | #ifdef CONFIG_NET_SCHED |
90 | if (ntx < dev->real_num_tx_queues) |
91 | qdisc_list_add(qdisc); |
92 | #endif |
93 | |
94 | } |
95 | kfree(priv->qdiscs); |
96 | priv->qdiscs = NULL; |
97 | } |
98 | |
99 | static int mq_dump(struct Qdisc *sch, struct sk_buff *skb) |
100 | { |
101 | struct net_device *dev = qdisc_dev(sch); |
102 | struct Qdisc *qdisc; |
103 | unsigned int ntx; |
104 | |
105 | sch->q.qlen = 0; |
106 | memset(&sch->bstats, 0, sizeof(sch->bstats)); |
107 | memset(&sch->qstats, 0, sizeof(sch->qstats)); |
108 | |
109 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
110 | qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; |
111 | spin_lock_bh(qdisc_lock(qdisc)); |
112 | sch->q.qlen += qdisc->q.qlen; |
113 | sch->bstats.bytes += qdisc->bstats.bytes; |
114 | sch->bstats.packets += qdisc->bstats.packets; |
115 | sch->qstats.qlen += qdisc->qstats.qlen; |
116 | sch->qstats.backlog += qdisc->qstats.backlog; |
117 | sch->qstats.drops += qdisc->qstats.drops; |
118 | sch->qstats.requeues += qdisc->qstats.requeues; |
119 | sch->qstats.overlimits += qdisc->qstats.overlimits; |
120 | spin_unlock_bh(qdisc_lock(qdisc)); |
121 | } |
122 | return 0; |
123 | } |
124 | |
125 | static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl) |
126 | { |
127 | struct net_device *dev = qdisc_dev(sch); |
128 | unsigned long ntx = cl - 1; |
129 | |
130 | if (ntx >= dev->num_tx_queues) |
131 | return NULL; |
132 | return netdev_get_tx_queue(dev, ntx); |
133 | } |
134 | |
135 | static struct netdev_queue *mq_select_queue(struct Qdisc *sch, |
136 | struct tcmsg *tcm) |
137 | { |
138 | unsigned int ntx = TC_H_MIN(tcm->tcm_parent); |
139 | struct netdev_queue *dev_queue = mq_queue_get(sch, ntx); |
140 | |
141 | if (!dev_queue) { |
142 | struct net_device *dev = qdisc_dev(sch); |
143 | |
144 | return netdev_get_tx_queue(dev, 0); |
145 | } |
146 | return dev_queue; |
147 | } |
148 | |
149 | static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, |
150 | struct Qdisc **old) |
151 | { |
152 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
153 | struct net_device *dev = qdisc_dev(sch); |
154 | |
155 | if (dev->flags & IFF_UP) |
156 | dev_deactivate(dev); |
157 | |
158 | *old = dev_graft_qdisc(dev_queue, new); |
159 | if (new) |
160 | new->flags |= TCQ_F_ONETXQUEUE; |
161 | if (dev->flags & IFF_UP) |
162 | dev_activate(dev); |
163 | return 0; |
164 | } |
165 | |
166 | static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) |
167 | { |
168 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
169 | |
170 | return dev_queue->qdisc_sleeping; |
171 | } |
172 | |
173 | static unsigned long mq_get(struct Qdisc *sch, u32 classid) |
174 | { |
175 | unsigned int ntx = TC_H_MIN(classid); |
176 | |
177 | if (!mq_queue_get(sch, ntx)) |
178 | return 0; |
179 | return ntx; |
180 | } |
181 | |
182 | static void mq_put(struct Qdisc *sch, unsigned long cl) |
183 | { |
184 | } |
185 | |
186 | static int mq_dump_class(struct Qdisc *sch, unsigned long cl, |
187 | struct sk_buff *skb, struct tcmsg *tcm) |
188 | { |
189 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
190 | |
191 | tcm->tcm_parent = TC_H_ROOT; |
192 | tcm->tcm_handle |= TC_H_MIN(cl); |
193 | tcm->tcm_info = dev_queue->qdisc_sleeping->handle; |
194 | return 0; |
195 | } |
196 | |
197 | static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
198 | struct gnet_dump *d) |
199 | { |
200 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); |
201 | |
202 | sch = dev_queue->qdisc_sleeping; |
203 | sch->qstats.qlen = sch->q.qlen; |
204 | if (gnet_stats_copy_basic(d, &sch->bstats) < 0 || |
205 | gnet_stats_copy_queue(d, &sch->qstats) < 0) |
206 | return -1; |
207 | return 0; |
208 | } |
209 | |
210 | static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
211 | { |
212 | struct net_device *dev = qdisc_dev(sch); |
213 | unsigned int ntx; |
214 | |
215 | if (arg->stop) |
216 | return; |
217 | |
218 | arg->count = arg->skip; |
219 | for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) { |
220 | if (arg->fn(sch, ntx + 1, arg) < 0) { |
221 | arg->stop = 1; |
222 | break; |
223 | } |
224 | arg->count++; |
225 | } |
226 | } |
227 | |
228 | static const struct Qdisc_class_ops mq_class_ops = { |
229 | .select_queue = mq_select_queue, |
230 | .graft = mq_graft, |
231 | .leaf = mq_leaf, |
232 | .get = mq_get, |
233 | .put = mq_put, |
234 | .walk = mq_walk, |
235 | .dump = mq_dump_class, |
236 | .dump_stats = mq_dump_class_stats, |
237 | }; |
238 | |
239 | struct Qdisc_ops mq_qdisc_ops __read_mostly = { |
240 | .cl_ops = &mq_class_ops, |
241 | .id = "mq", |
242 | .priv_size = sizeof(struct mq_sched), |
243 | .init = mq_init, |
244 | .destroy = mq_destroy, |
245 | .attach = mq_attach, |
246 | .dump = mq_dump, |
247 | .owner = THIS_MODULE, |
248 | }; |
249 |
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