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Linux/net/sched/sch_mq.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * net/sched/sch_mq.c           Classful multiqueue dummy scheduler
  4  *
  5  * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
  6  */
  7 
  8 #include <linux/types.h>
  9 #include <linux/slab.h>
 10 #include <linux/kernel.h>
 11 #include <linux/export.h>
 12 #include <linux/string.h>
 13 #include <linux/errno.h>
 14 #include <linux/skbuff.h>
 15 #include <net/netlink.h>
 16 #include <net/pkt_cls.h>
 17 #include <net/pkt_sched.h>
 18 #include <net/sch_generic.h>
 19 
 20 struct mq_sched {
 21         struct Qdisc            **qdiscs;
 22 };
 23 
 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 
 38 static int mq_offload_stats(struct Qdisc *sch)
 39 {
 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 
 49         return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_MQ, &opt);
 50 }
 51 
 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 
 58         mq_offload(sch, TC_MQ_DESTROY);
 59 
 60         if (!priv->qdiscs)
 61                 return;
 62         for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
 63                 qdisc_put(priv->qdiscs[ntx]);
 64         kfree(priv->qdiscs);
 65 }
 66 
 67 static int mq_init(struct Qdisc *sch, struct nlattr *opt,
 68                    struct netlink_ext_ack *extack)
 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);
 85         if (!priv->qdiscs)
 86                 return -ENOMEM;
 87 
 88         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 89                 dev_queue = netdev_get_tx_queue(dev, ntx);
 90                 qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx),
 91                                           TC_H_MAKE(TC_H_MAJ(sch->handle),
 92                                                     TC_H_MIN(ntx + 1)),
 93                                           extack);
 94                 if (!qdisc)
 95                         return -ENOMEM;
 96                 priv->qdiscs[ntx] = qdisc;
 97                 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
 98         }
 99 
100         sch->flags |= TCQ_F_MQROOT;
101 
102         mq_offload(sch, TC_MQ_CREATE);
103         return 0;
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);
110         struct Qdisc *qdisc, *old;
111         unsigned int ntx;
112 
113         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
114                 qdisc = priv->qdiscs[ntx];
115                 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
116                 if (old)
117                         qdisc_put(old);
118 #ifdef CONFIG_NET_SCHED
119                 if (ntx < dev->real_num_tx_queues)
120                         qdisc_hash_add(qdisc, false);
121 #endif
122 
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         __u32 qlen = 0;
134 
135         sch->q.qlen = 0;
136         memset(&sch->bstats, 0, sizeof(sch->bstats));
137         memset(&sch->qstats, 0, sizeof(sch->qstats));
138 
139         /* MQ supports lockless qdiscs. However, statistics accounting needs
140          * to account for all, none, or a mix of locked and unlocked child
141          * qdiscs. Percpu stats are added to counters in-band and locking
142          * qdisc totals are added at end.
143          */
144         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
145                 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
146                 spin_lock_bh(qdisc_lock(qdisc));
147 
148                 if (qdisc_is_percpu_stats(qdisc)) {
149                         qlen = qdisc_qlen_sum(qdisc);
150                         __gnet_stats_copy_basic(NULL, &sch->bstats,
151                                                 qdisc->cpu_bstats,
152                                                 &qdisc->bstats);
153                         __gnet_stats_copy_queue(&sch->qstats,
154                                                 qdisc->cpu_qstats,
155                                                 &qdisc->qstats, qlen);
156                         sch->q.qlen             += qlen;
157                 } else {
158                         sch->q.qlen             += qdisc->q.qlen;
159                         sch->bstats.bytes       += qdisc->bstats.bytes;
160                         sch->bstats.packets     += qdisc->bstats.packets;
161                         sch->qstats.qlen        += qdisc->qstats.qlen;
162                         sch->qstats.backlog     += qdisc->qstats.backlog;
163                         sch->qstats.drops       += qdisc->qstats.drops;
164                         sch->qstats.requeues    += qdisc->qstats.requeues;
165                         sch->qstats.overlimits  += qdisc->qstats.overlimits;
166                 }
167 
168                 spin_unlock_bh(qdisc_lock(qdisc));
169         }
170 
171         return mq_offload_stats(sch);
172 }
173 
174 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
175 {
176         struct net_device *dev = qdisc_dev(sch);
177         unsigned long ntx = cl - 1;
178 
179         if (ntx >= dev->num_tx_queues)
180                 return NULL;
181         return netdev_get_tx_queue(dev, ntx);
182 }
183 
184 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
185                                             struct tcmsg *tcm)
186 {
187         return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
188 }
189 
190 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
191                     struct Qdisc **old, struct netlink_ext_ack *extack)
192 {
193         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
194         struct tc_mq_qopt_offload graft_offload;
195         struct net_device *dev = qdisc_dev(sch);
196 
197         if (dev->flags & IFF_UP)
198                 dev_deactivate(dev);
199 
200         *old = dev_graft_qdisc(dev_queue, new);
201         if (new)
202                 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
203         if (dev->flags & IFF_UP)
204                 dev_activate(dev);
205 
206         graft_offload.handle = sch->handle;
207         graft_offload.graft_params.queue = cl - 1;
208         graft_offload.graft_params.child_handle = new ? new->handle : 0;
209         graft_offload.command = TC_MQ_GRAFT;
210 
211         qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old,
212                                    TC_SETUP_QDISC_MQ, &graft_offload, extack);
213         return 0;
214 }
215 
216 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
217 {
218         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
219 
220         return dev_queue->qdisc_sleeping;
221 }
222 
223 static unsigned long mq_find(struct Qdisc *sch, u32 classid)
224 {
225         unsigned int ntx = TC_H_MIN(classid);
226 
227         if (!mq_queue_get(sch, ntx))
228                 return 0;
229         return ntx;
230 }
231 
232 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
233                          struct sk_buff *skb, struct tcmsg *tcm)
234 {
235         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
236 
237         tcm->tcm_parent = TC_H_ROOT;
238         tcm->tcm_handle |= TC_H_MIN(cl);
239         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
240         return 0;
241 }
242 
243 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
244                                struct gnet_dump *d)
245 {
246         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
247 
248         sch = dev_queue->qdisc_sleeping;
249         if (gnet_stats_copy_basic(&sch->running, d, sch->cpu_bstats,
250                                   &sch->bstats) < 0 ||
251             qdisc_qstats_copy(d, sch) < 0)
252                 return -1;
253         return 0;
254 }
255 
256 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
257 {
258         struct net_device *dev = qdisc_dev(sch);
259         unsigned int ntx;
260 
261         if (arg->stop)
262                 return;
263 
264         arg->count = arg->skip;
265         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
266                 if (arg->fn(sch, ntx + 1, arg) < 0) {
267                         arg->stop = 1;
268                         break;
269                 }
270                 arg->count++;
271         }
272 }
273 
274 static const struct Qdisc_class_ops mq_class_ops = {
275         .select_queue   = mq_select_queue,
276         .graft          = mq_graft,
277         .leaf           = mq_leaf,
278         .find           = mq_find,
279         .walk           = mq_walk,
280         .dump           = mq_dump_class,
281         .dump_stats     = mq_dump_class_stats,
282 };
283 
284 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
285         .cl_ops         = &mq_class_ops,
286         .id             = "mq",
287         .priv_size      = sizeof(struct mq_sched),
288         .init           = mq_init,
289         .destroy        = mq_destroy,
290         .attach         = mq_attach,
291         .dump           = mq_dump,
292         .owner          = THIS_MODULE,
293 };
294 

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