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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, default_qdisc_ops,
 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;
 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.qlen        += qdisc->qstats.qlen;
116                 sch->qstats.backlog     += qdisc->qstats.backlog;
117                 sch->qstats.drops       += qdisc->qstats.drops;
118                 sch->qstats.requeues    += qdisc->qstats.requeues;
119                 sch->qstats.overlimits  += qdisc->qstats.overlimits;
120                 spin_unlock_bh(qdisc_lock(qdisc));
121         }
122         return 0;
123 }
124 
125 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
126 {
127         struct net_device *dev = qdisc_dev(sch);
128         unsigned long ntx = cl - 1;
129 
130         if (ntx >= dev->num_tx_queues)
131                 return NULL;
132         return netdev_get_tx_queue(dev, ntx);
133 }
134 
135 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
136                                             struct tcmsg *tcm)
137 {
138         unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
139         struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
140 
141         if (!dev_queue) {
142                 struct net_device *dev = qdisc_dev(sch);
143 
144                 return netdev_get_tx_queue(dev, 0);
145         }
146         return dev_queue;
147 }
148 
149 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
150                     struct Qdisc **old)
151 {
152         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
153         struct net_device *dev = qdisc_dev(sch);
154 
155         if (dev->flags & IFF_UP)
156                 dev_deactivate(dev);
157 
158         *old = dev_graft_qdisc(dev_queue, new);
159         if (new)
160                 new->flags |= TCQ_F_ONETXQUEUE;
161         if (dev->flags & IFF_UP)
162                 dev_activate(dev);
163         return 0;
164 }
165 
166 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
167 {
168         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
169 
170         return dev_queue->qdisc_sleeping;
171 }
172 
173 static unsigned long mq_get(struct Qdisc *sch, u32 classid)
174 {
175         unsigned int ntx = TC_H_MIN(classid);
176 
177         if (!mq_queue_get(sch, ntx))
178                 return 0;
179         return ntx;
180 }
181 
182 static void mq_put(struct Qdisc *sch, unsigned long cl)
183 {
184 }
185 
186 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
187                          struct sk_buff *skb, struct tcmsg *tcm)
188 {
189         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
190 
191         tcm->tcm_parent = TC_H_ROOT;
192         tcm->tcm_handle |= TC_H_MIN(cl);
193         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
194         return 0;
195 }
196 
197 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
198                                struct gnet_dump *d)
199 {
200         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
201 
202         sch = dev_queue->qdisc_sleeping;
203         sch->qstats.qlen = sch->q.qlen;
204         if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
205             gnet_stats_copy_queue(d, &sch->qstats) < 0)
206                 return -1;
207         return 0;
208 }
209 
210 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
211 {
212         struct net_device *dev = qdisc_dev(sch);
213         unsigned int ntx;
214 
215         if (arg->stop)
216                 return;
217 
218         arg->count = arg->skip;
219         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
220                 if (arg->fn(sch, ntx + 1, arg) < 0) {
221                         arg->stop = 1;
222                         break;
223                 }
224                 arg->count++;
225         }
226 }
227 
228 static const struct Qdisc_class_ops mq_class_ops = {
229         .select_queue   = mq_select_queue,
230         .graft          = mq_graft,
231         .leaf           = mq_leaf,
232         .get            = mq_get,
233         .put            = mq_put,
234         .walk           = mq_walk,
235         .dump           = mq_dump_class,
236         .dump_stats     = mq_dump_class_stats,
237 };
238 
239 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
240         .cl_ops         = &mq_class_ops,
241         .id             = "mq",
242         .priv_size      = sizeof(struct mq_sched),
243         .init           = mq_init,
244         .destroy        = mq_destroy,
245         .attach         = mq_attach,
246         .dump           = mq_dump,
247         .owner          = THIS_MODULE,
248 };
249 

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