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6ec1c69a DM |
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> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
6ec1c69a | 13 | #include <linux/kernel.h> |
bc3b2d7f | 14 | #include <linux/export.h> |
6ec1c69a DM |
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); | |
6da7c8fc | 60 | qdisc = qdisc_create_dflt(dev_queue, default_qdisc_ops, |
6ec1c69a DM |
61 | TC_H_MAKE(TC_H_MAJ(sch->handle), |
62 | TC_H_MIN(ntx + 1))); | |
63 | if (qdisc == NULL) | |
64 | goto err; | |
6ec1c69a | 65 | priv->qdiscs[ntx] = qdisc; |
1abbe139 | 66 | qdisc->flags |= TCQ_F_ONETXQUEUE; |
6ec1c69a DM |
67 | } |
68 | ||
23bcf634 | 69 | sch->flags |= TCQ_F_MQROOT; |
6ec1c69a DM |
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); | |
95dc1929 | 81 | struct Qdisc *qdisc, *old; |
6ec1c69a DM |
82 | unsigned int ntx; |
83 | ||
84 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { | |
85 | qdisc = priv->qdiscs[ntx]; | |
95dc1929 ED |
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 | ||
6ec1c69a DM |
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; | |
6ec1c69a DM |
115 | sch->qstats.backlog += qdisc->qstats.backlog; |
116 | sch->qstats.drops += qdisc->qstats.drops; | |
117 | sch->qstats.requeues += qdisc->qstats.requeues; | |
118 | sch->qstats.overlimits += qdisc->qstats.overlimits; | |
119 | spin_unlock_bh(qdisc_lock(qdisc)); | |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl) | |
125 | { | |
126 | struct net_device *dev = qdisc_dev(sch); | |
127 | unsigned long ntx = cl - 1; | |
128 | ||
129 | if (ntx >= dev->num_tx_queues) | |
130 | return NULL; | |
131 | return netdev_get_tx_queue(dev, ntx); | |
132 | } | |
133 | ||
926e61b7 JP |
134 | static struct netdev_queue *mq_select_queue(struct Qdisc *sch, |
135 | struct tcmsg *tcm) | |
6ec1c69a DM |
136 | { |
137 | unsigned int ntx = TC_H_MIN(tcm->tcm_parent); | |
926e61b7 | 138 | struct netdev_queue *dev_queue = mq_queue_get(sch, ntx); |
6ec1c69a | 139 | |
926e61b7 JP |
140 | if (!dev_queue) { |
141 | struct net_device *dev = qdisc_dev(sch); | |
142 | ||
143 | return netdev_get_tx_queue(dev, 0); | |
144 | } | |
145 | return dev_queue; | |
6ec1c69a DM |
146 | } |
147 | ||
148 | static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, | |
149 | struct Qdisc **old) | |
150 | { | |
151 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
152 | struct net_device *dev = qdisc_dev(sch); | |
153 | ||
154 | if (dev->flags & IFF_UP) | |
155 | dev_deactivate(dev); | |
156 | ||
157 | *old = dev_graft_qdisc(dev_queue, new); | |
1abbe139 ED |
158 | if (new) |
159 | new->flags |= TCQ_F_ONETXQUEUE; | |
6ec1c69a DM |
160 | if (dev->flags & IFF_UP) |
161 | dev_activate(dev); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) | |
166 | { | |
167 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
168 | ||
169 | return dev_queue->qdisc_sleeping; | |
170 | } | |
171 | ||
172 | static unsigned long mq_get(struct Qdisc *sch, u32 classid) | |
173 | { | |
174 | unsigned int ntx = TC_H_MIN(classid); | |
175 | ||
176 | if (!mq_queue_get(sch, ntx)) | |
177 | return 0; | |
178 | return ntx; | |
179 | } | |
180 | ||
181 | static void mq_put(struct Qdisc *sch, unsigned long cl) | |
182 | { | |
6ec1c69a DM |
183 | } |
184 | ||
185 | static int mq_dump_class(struct Qdisc *sch, unsigned long cl, | |
186 | struct sk_buff *skb, struct tcmsg *tcm) | |
187 | { | |
188 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
189 | ||
190 | tcm->tcm_parent = TC_H_ROOT; | |
191 | tcm->tcm_handle |= TC_H_MIN(cl); | |
192 | tcm->tcm_info = dev_queue->qdisc_sleeping->handle; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
197 | struct gnet_dump *d) | |
198 | { | |
199 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
200 | ||
201 | sch = dev_queue->qdisc_sleeping; | |
22e0f8b9 | 202 | if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 || |
b0ab6f92 | 203 | gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0) |
6ec1c69a DM |
204 | return -1; |
205 | return 0; | |
206 | } | |
207 | ||
208 | static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
209 | { | |
210 | struct net_device *dev = qdisc_dev(sch); | |
211 | unsigned int ntx; | |
212 | ||
213 | if (arg->stop) | |
214 | return; | |
215 | ||
216 | arg->count = arg->skip; | |
217 | for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) { | |
218 | if (arg->fn(sch, ntx + 1, arg) < 0) { | |
219 | arg->stop = 1; | |
220 | break; | |
221 | } | |
222 | arg->count++; | |
223 | } | |
224 | } | |
225 | ||
226 | static const struct Qdisc_class_ops mq_class_ops = { | |
227 | .select_queue = mq_select_queue, | |
228 | .graft = mq_graft, | |
229 | .leaf = mq_leaf, | |
230 | .get = mq_get, | |
231 | .put = mq_put, | |
232 | .walk = mq_walk, | |
233 | .dump = mq_dump_class, | |
234 | .dump_stats = mq_dump_class_stats, | |
235 | }; | |
236 | ||
237 | struct Qdisc_ops mq_qdisc_ops __read_mostly = { | |
238 | .cl_ops = &mq_class_ops, | |
239 | .id = "mq", | |
240 | .priv_size = sizeof(struct mq_sched), | |
241 | .init = mq_init, | |
242 | .destroy = mq_destroy, | |
243 | .attach = mq_attach, | |
244 | .dump = mq_dump, | |
245 | .owner = THIS_MODULE, | |
246 | }; |