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Linux/net/sched/sch_mq.c

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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_cls.h>
 20 #include <net/pkt_sched.h>
 21 #include <net/sch_generic.h>
 22 
 23 struct mq_sched {
 24         struct Qdisc            **qdiscs;
 25 };
 26 
 27 static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd)
 28 {
 29         struct net_device *dev = qdisc_dev(sch);
 30         struct tc_mq_qopt_offload opt = {
 31                 .command = cmd,
 32                 .handle = sch->handle,
 33         };
 34 
 35         if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
 36                 return -EOPNOTSUPP;
 37 
 38         return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt);
 39 }
 40 
 41 static void mq_offload_stats(struct Qdisc *sch)
 42 {
 43         struct net_device *dev = qdisc_dev(sch);
 44         struct tc_mq_qopt_offload opt = {
 45                 .command = TC_MQ_STATS,
 46                 .handle = sch->handle,
 47                 .stats = {
 48                         .bstats = &sch->bstats,
 49                         .qstats = &sch->qstats,
 50                 },
 51         };
 52 
 53         if (tc_can_offload(dev) && dev->netdev_ops->ndo_setup_tc)
 54                 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt);
 55 }
 56 
 57 static void mq_destroy(struct Qdisc *sch)
 58 {
 59         struct net_device *dev = qdisc_dev(sch);
 60         struct mq_sched *priv = qdisc_priv(sch);
 61         unsigned int ntx;
 62 
 63         mq_offload(sch, TC_MQ_DESTROY);
 64 
 65         if (!priv->qdiscs)
 66                 return;
 67         for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
 68                 qdisc_put(priv->qdiscs[ntx]);
 69         kfree(priv->qdiscs);
 70 }
 71 
 72 static int mq_init(struct Qdisc *sch, struct nlattr *opt,
 73                    struct netlink_ext_ack *extack)
 74 {
 75         struct net_device *dev = qdisc_dev(sch);
 76         struct mq_sched *priv = qdisc_priv(sch);
 77         struct netdev_queue *dev_queue;
 78         struct Qdisc *qdisc;
 79         unsigned int ntx;
 80 
 81         if (sch->parent != TC_H_ROOT)
 82                 return -EOPNOTSUPP;
 83 
 84         if (!netif_is_multiqueue(dev))
 85                 return -EOPNOTSUPP;
 86 
 87         /* pre-allocate qdiscs, attachment can't fail */
 88         priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
 89                                GFP_KERNEL);
 90         if (!priv->qdiscs)
 91                 return -ENOMEM;
 92 
 93         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 94                 dev_queue = netdev_get_tx_queue(dev, ntx);
 95                 qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx),
 96                                           TC_H_MAKE(TC_H_MAJ(sch->handle),
 97                                                     TC_H_MIN(ntx + 1)),
 98                                           extack);
 99                 if (!qdisc)
100                         return -ENOMEM;
101                 priv->qdiscs[ntx] = qdisc;
102                 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
103         }
104 
105         sch->flags |= TCQ_F_MQROOT;
106 
107         mq_offload(sch, TC_MQ_CREATE);
108         return 0;
109 }
110 
111 static void mq_attach(struct Qdisc *sch)
112 {
113         struct net_device *dev = qdisc_dev(sch);
114         struct mq_sched *priv = qdisc_priv(sch);
115         struct Qdisc *qdisc, *old;
116         unsigned int ntx;
117 
118         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
119                 qdisc = priv->qdiscs[ntx];
120                 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
121                 if (old)
122                         qdisc_put(old);
123 #ifdef CONFIG_NET_SCHED
124                 if (ntx < dev->real_num_tx_queues)
125                         qdisc_hash_add(qdisc, false);
126 #endif
127 
128         }
129         kfree(priv->qdiscs);
130         priv->qdiscs = NULL;
131 }
132 
133 static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
134 {
135         struct net_device *dev = qdisc_dev(sch);
136         struct Qdisc *qdisc;
137         unsigned int ntx;
138         __u32 qlen = 0;
139 
140         sch->q.qlen = 0;
141         memset(&sch->bstats, 0, sizeof(sch->bstats));
142         memset(&sch->qstats, 0, sizeof(sch->qstats));
143 
144         /* MQ supports lockless qdiscs. However, statistics accounting needs
145          * to account for all, none, or a mix of locked and unlocked child
146          * qdiscs. Percpu stats are added to counters in-band and locking
147          * qdisc totals are added at end.
148          */
149         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
150                 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
151                 spin_lock_bh(qdisc_lock(qdisc));
152 
153                 if (qdisc_is_percpu_stats(qdisc)) {
154                         qlen = qdisc_qlen_sum(qdisc);
155                         __gnet_stats_copy_basic(NULL, &sch->bstats,
156                                                 qdisc->cpu_bstats,
157                                                 &qdisc->bstats);
158                         __gnet_stats_copy_queue(&sch->qstats,
159                                                 qdisc->cpu_qstats,
160                                                 &qdisc->qstats, qlen);
161                 } else {
162                         sch->q.qlen             += qdisc->q.qlen;
163                         sch->bstats.bytes       += qdisc->bstats.bytes;
164                         sch->bstats.packets     += qdisc->bstats.packets;
165                         sch->qstats.qlen        += qdisc->qstats.qlen;
166                         sch->qstats.backlog     += qdisc->qstats.backlog;
167                         sch->qstats.drops       += qdisc->qstats.drops;
168                         sch->qstats.requeues    += qdisc->qstats.requeues;
169                         sch->qstats.overlimits  += qdisc->qstats.overlimits;
170                 }
171 
172                 spin_unlock_bh(qdisc_lock(qdisc));
173         }
174         mq_offload_stats(sch);
175 
176         return 0;
177 }
178 
179 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
180 {
181         struct net_device *dev = qdisc_dev(sch);
182         unsigned long ntx = cl - 1;
183 
184         if (ntx >= dev->num_tx_queues)
185                 return NULL;
186         return netdev_get_tx_queue(dev, ntx);
187 }
188 
189 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
190                                             struct tcmsg *tcm)
191 {
192         return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
193 }
194 
195 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
196                     struct Qdisc **old, struct netlink_ext_ack *extack)
197 {
198         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
199         struct net_device *dev = qdisc_dev(sch);
200 
201         if (dev->flags & IFF_UP)
202                 dev_deactivate(dev);
203 
204         *old = dev_graft_qdisc(dev_queue, new);
205         if (new)
206                 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
207         if (dev->flags & IFF_UP)
208                 dev_activate(dev);
209         return 0;
210 }
211 
212 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
213 {
214         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
215 
216         return dev_queue->qdisc_sleeping;
217 }
218 
219 static unsigned long mq_find(struct Qdisc *sch, u32 classid)
220 {
221         unsigned int ntx = TC_H_MIN(classid);
222 
223         if (!mq_queue_get(sch, ntx))
224                 return 0;
225         return ntx;
226 }
227 
228 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
229                          struct sk_buff *skb, struct tcmsg *tcm)
230 {
231         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
232 
233         tcm->tcm_parent = TC_H_ROOT;
234         tcm->tcm_handle |= TC_H_MIN(cl);
235         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
236         return 0;
237 }
238 
239 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
240                                struct gnet_dump *d)
241 {
242         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
243 
244         sch = dev_queue->qdisc_sleeping;
245         if (gnet_stats_copy_basic(&sch->running, d, NULL, &sch->bstats) < 0 ||
246             gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0)
247                 return -1;
248         return 0;
249 }
250 
251 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
252 {
253         struct net_device *dev = qdisc_dev(sch);
254         unsigned int ntx;
255 
256         if (arg->stop)
257                 return;
258 
259         arg->count = arg->skip;
260         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
261                 if (arg->fn(sch, ntx + 1, arg) < 0) {
262                         arg->stop = 1;
263                         break;
264                 }
265                 arg->count++;
266         }
267 }
268 
269 static const struct Qdisc_class_ops mq_class_ops = {
270         .select_queue   = mq_select_queue,
271         .graft          = mq_graft,
272         .leaf           = mq_leaf,
273         .find           = mq_find,
274         .walk           = mq_walk,
275         .dump           = mq_dump_class,
276         .dump_stats     = mq_dump_class_stats,
277 };
278 
279 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
280         .cl_ops         = &mq_class_ops,
281         .id             = "mq",
282         .priv_size      = sizeof(struct mq_sched),
283         .init           = mq_init,
284         .destroy        = mq_destroy,
285         .attach         = mq_attach,
286         .dump           = mq_dump,
287         .owner          = THIS_MODULE,
288 };
289 

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