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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 
 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);
 60                 qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx),
 61                                           TC_H_MAKE(TC_H_MAJ(sch->handle),
 62                                                     TC_H_MIN(ntx + 1)));
 63                 if (qdisc == NULL)
 64                         goto err;
 65                 priv->qdiscs[ntx] = qdisc;
 66                 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
 67         }
 68 
 69         sch->flags |= TCQ_F_MQROOT;
 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);
 81         struct Qdisc *qdisc, *old;
 82         unsigned int ntx;
 83 
 84         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 85                 qdisc = priv->qdiscs[ntx];
 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 
 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;
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 
134 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
135                                             struct tcmsg *tcm)
136 {
137         unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
138         struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
139 
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;
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);
158         if (new)
159                 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
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 {
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;
202         if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 ||
203             gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0)
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 };
247 

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