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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6ec1c69a DM |
2 | /* |
3 | * net/sched/sch_mq.c Classful multiqueue dummy scheduler | |
4 | * | |
5 | * Copyright (c) 2009 Patrick McHardy <kaber@trash.net> | |
6ec1c69a DM |
6 | */ |
7 | ||
8 | #include <linux/types.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
6ec1c69a | 10 | #include <linux/kernel.h> |
bc3b2d7f | 11 | #include <linux/export.h> |
6ec1c69a DM |
12 | #include <linux/string.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <net/netlink.h> | |
f971b132 | 16 | #include <net/pkt_cls.h> |
6ec1c69a | 17 | #include <net/pkt_sched.h> |
b01ac095 | 18 | #include <net/sch_generic.h> |
6ec1c69a DM |
19 | |
20 | struct mq_sched { | |
21 | struct Qdisc **qdiscs; | |
22 | }; | |
23 | ||
f971b132 JK |
24 | static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd) |
25 | { | |
26 | struct net_device *dev = qdisc_dev(sch); | |
27 | struct tc_mq_qopt_offload opt = { | |
28 | .command = cmd, | |
29 | .handle = sch->handle, | |
30 | }; | |
31 | ||
32 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
33 | return -EOPNOTSUPP; | |
34 | ||
35 | return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt); | |
36 | } | |
37 | ||
58f89273 | 38 | static int mq_offload_stats(struct Qdisc *sch) |
47c669a4 | 39 | { |
47c669a4 JK |
40 | struct tc_mq_qopt_offload opt = { |
41 | .command = TC_MQ_STATS, | |
42 | .handle = sch->handle, | |
43 | .stats = { | |
44 | .bstats = &sch->bstats, | |
45 | .qstats = &sch->qstats, | |
46 | }, | |
47 | }; | |
48 | ||
58f89273 | 49 | return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_MQ, &opt); |
47c669a4 JK |
50 | } |
51 | ||
6ec1c69a DM |
52 | static void mq_destroy(struct Qdisc *sch) |
53 | { | |
54 | struct net_device *dev = qdisc_dev(sch); | |
55 | struct mq_sched *priv = qdisc_priv(sch); | |
56 | unsigned int ntx; | |
57 | ||
f971b132 JK |
58 | mq_offload(sch, TC_MQ_DESTROY); |
59 | ||
6ec1c69a DM |
60 | if (!priv->qdiscs) |
61 | return; | |
62 | for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++) | |
86bd446b | 63 | qdisc_put(priv->qdiscs[ntx]); |
6ec1c69a DM |
64 | kfree(priv->qdiscs); |
65 | } | |
66 | ||
e63d7dfd AA |
67 | static int mq_init(struct Qdisc *sch, struct nlattr *opt, |
68 | struct netlink_ext_ack *extack) | |
6ec1c69a DM |
69 | { |
70 | struct net_device *dev = qdisc_dev(sch); | |
71 | struct mq_sched *priv = qdisc_priv(sch); | |
72 | struct netdev_queue *dev_queue; | |
73 | struct Qdisc *qdisc; | |
74 | unsigned int ntx; | |
75 | ||
76 | if (sch->parent != TC_H_ROOT) | |
77 | return -EOPNOTSUPP; | |
78 | ||
79 | if (!netif_is_multiqueue(dev)) | |
80 | return -EOPNOTSUPP; | |
81 | ||
82 | /* pre-allocate qdiscs, attachment can't fail */ | |
83 | priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]), | |
84 | GFP_KERNEL); | |
87b60cfa | 85 | if (!priv->qdiscs) |
6ec1c69a DM |
86 | return -ENOMEM; |
87 | ||
88 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { | |
89 | dev_queue = netdev_get_tx_queue(dev, ntx); | |
1f27cde3 | 90 | qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx), |
6ec1c69a | 91 | TC_H_MAKE(TC_H_MAJ(sch->handle), |
a38a9882 AA |
92 | TC_H_MIN(ntx + 1)), |
93 | extack); | |
87b60cfa ED |
94 | if (!qdisc) |
95 | return -ENOMEM; | |
6ec1c69a | 96 | priv->qdiscs[ntx] = qdisc; |
4eaf3b84 | 97 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
6ec1c69a DM |
98 | } |
99 | ||
23bcf634 | 100 | sch->flags |= TCQ_F_MQROOT; |
f971b132 JK |
101 | |
102 | mq_offload(sch, TC_MQ_CREATE); | |
6ec1c69a | 103 | return 0; |
6ec1c69a DM |
104 | } |
105 | ||
106 | static void mq_attach(struct Qdisc *sch) | |
107 | { | |
108 | struct net_device *dev = qdisc_dev(sch); | |
109 | struct mq_sched *priv = qdisc_priv(sch); | |
95dc1929 | 110 | struct Qdisc *qdisc, *old; |
6ec1c69a DM |
111 | unsigned int ntx; |
112 | ||
113 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { | |
114 | qdisc = priv->qdiscs[ntx]; | |
95dc1929 ED |
115 | old = dev_graft_qdisc(qdisc->dev_queue, qdisc); |
116 | if (old) | |
86bd446b | 117 | qdisc_put(old); |
95dc1929 ED |
118 | #ifdef CONFIG_NET_SCHED |
119 | if (ntx < dev->real_num_tx_queues) | |
49b49971 | 120 | qdisc_hash_add(qdisc, false); |
95dc1929 ED |
121 | #endif |
122 | ||
6ec1c69a DM |
123 | } |
124 | kfree(priv->qdiscs); | |
125 | priv->qdiscs = NULL; | |
126 | } | |
127 | ||
128 | static int mq_dump(struct Qdisc *sch, struct sk_buff *skb) | |
129 | { | |
130 | struct net_device *dev = qdisc_dev(sch); | |
131 | struct Qdisc *qdisc; | |
132 | unsigned int ntx; | |
133 | ||
134 | sch->q.qlen = 0; | |
50dc9a85 | 135 | gnet_stats_basic_sync_init(&sch->bstats); |
6ec1c69a DM |
136 | memset(&sch->qstats, 0, sizeof(sch->qstats)); |
137 | ||
ce679e8d JF |
138 | /* MQ supports lockless qdiscs. However, statistics accounting needs |
139 | * to account for all, none, or a mix of locked and unlocked child | |
140 | * qdiscs. Percpu stats are added to counters in-band and locking | |
141 | * qdisc totals are added at end. | |
142 | */ | |
6ec1c69a DM |
143 | for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { |
144 | qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; | |
145 | spin_lock_bh(qdisc_lock(qdisc)); | |
b01ac095 | 146 | |
29cbcd85 AD |
147 | gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats, |
148 | &qdisc->bstats, false); | |
7361df46 SAS |
149 | gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats, |
150 | &qdisc->qstats); | |
151 | sch->q.qlen += qdisc_qlen(qdisc); | |
b01ac095 | 152 | |
6ec1c69a DM |
153 | spin_unlock_bh(qdisc_lock(qdisc)); |
154 | } | |
ce679e8d | 155 | |
58f89273 | 156 | return mq_offload_stats(sch); |
6ec1c69a DM |
157 | } |
158 | ||
159 | static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl) | |
160 | { | |
161 | struct net_device *dev = qdisc_dev(sch); | |
162 | unsigned long ntx = cl - 1; | |
163 | ||
164 | if (ntx >= dev->num_tx_queues) | |
165 | return NULL; | |
166 | return netdev_get_tx_queue(dev, ntx); | |
167 | } | |
168 | ||
926e61b7 JP |
169 | static struct netdev_queue *mq_select_queue(struct Qdisc *sch, |
170 | struct tcmsg *tcm) | |
6ec1c69a | 171 | { |
ce8a75f6 | 172 | return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent)); |
6ec1c69a DM |
173 | } |
174 | ||
175 | static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, | |
653d6fd6 | 176 | struct Qdisc **old, struct netlink_ext_ack *extack) |
6ec1c69a DM |
177 | { |
178 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
d577a3d2 | 179 | struct tc_mq_qopt_offload graft_offload; |
6ec1c69a DM |
180 | struct net_device *dev = qdisc_dev(sch); |
181 | ||
182 | if (dev->flags & IFF_UP) | |
183 | dev_deactivate(dev); | |
184 | ||
185 | *old = dev_graft_qdisc(dev_queue, new); | |
1abbe139 | 186 | if (new) |
4eaf3b84 | 187 | new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
6ec1c69a DM |
188 | if (dev->flags & IFF_UP) |
189 | dev_activate(dev); | |
d577a3d2 JK |
190 | |
191 | graft_offload.handle = sch->handle; | |
192 | graft_offload.graft_params.queue = cl - 1; | |
193 | graft_offload.graft_params.child_handle = new ? new->handle : 0; | |
194 | graft_offload.command = TC_MQ_GRAFT; | |
195 | ||
196 | qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old, | |
197 | TC_SETUP_QDISC_MQ, &graft_offload, extack); | |
6ec1c69a DM |
198 | return 0; |
199 | } | |
200 | ||
201 | static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) | |
202 | { | |
203 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
204 | ||
205 | return dev_queue->qdisc_sleeping; | |
206 | } | |
207 | ||
143976ce | 208 | static unsigned long mq_find(struct Qdisc *sch, u32 classid) |
6ec1c69a DM |
209 | { |
210 | unsigned int ntx = TC_H_MIN(classid); | |
211 | ||
212 | if (!mq_queue_get(sch, ntx)) | |
213 | return 0; | |
214 | return ntx; | |
215 | } | |
216 | ||
6ec1c69a DM |
217 | static int mq_dump_class(struct Qdisc *sch, unsigned long cl, |
218 | struct sk_buff *skb, struct tcmsg *tcm) | |
219 | { | |
220 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
221 | ||
222 | tcm->tcm_parent = TC_H_ROOT; | |
223 | tcm->tcm_handle |= TC_H_MIN(cl); | |
224 | tcm->tcm_info = dev_queue->qdisc_sleeping->handle; | |
225 | return 0; | |
226 | } | |
227 | ||
228 | static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl, | |
229 | struct gnet_dump *d) | |
230 | { | |
231 | struct netdev_queue *dev_queue = mq_queue_get(sch, cl); | |
232 | ||
233 | sch = dev_queue->qdisc_sleeping; | |
29cbcd85 | 234 | if (gnet_stats_copy_basic(d, sch->cpu_bstats, &sch->bstats, true) < 0 || |
5dd431b6 | 235 | qdisc_qstats_copy(d, sch) < 0) |
6ec1c69a DM |
236 | return -1; |
237 | return 0; | |
238 | } | |
239 | ||
240 | static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
241 | { | |
242 | struct net_device *dev = qdisc_dev(sch); | |
243 | unsigned int ntx; | |
244 | ||
245 | if (arg->stop) | |
246 | return; | |
247 | ||
248 | arg->count = arg->skip; | |
249 | for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) { | |
e046fa89 | 250 | if (!tc_qdisc_stats_dump(sch, ntx + 1, arg)) |
6ec1c69a | 251 | break; |
6ec1c69a DM |
252 | } |
253 | } | |
254 | ||
255 | static const struct Qdisc_class_ops mq_class_ops = { | |
256 | .select_queue = mq_select_queue, | |
257 | .graft = mq_graft, | |
258 | .leaf = mq_leaf, | |
143976ce | 259 | .find = mq_find, |
6ec1c69a DM |
260 | .walk = mq_walk, |
261 | .dump = mq_dump_class, | |
262 | .dump_stats = mq_dump_class_stats, | |
263 | }; | |
264 | ||
265 | struct Qdisc_ops mq_qdisc_ops __read_mostly = { | |
266 | .cl_ops = &mq_class_ops, | |
267 | .id = "mq", | |
268 | .priv_size = sizeof(struct mq_sched), | |
269 | .init = mq_init, | |
270 | .destroy = mq_destroy, | |
271 | .attach = mq_attach, | |
1e080f17 | 272 | .change_real_num_tx = mq_change_real_num_tx, |
6ec1c69a DM |
273 | .dump = mq_dump, |
274 | .owner = THIS_MODULE, | |
275 | }; |