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

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