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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/kernel.h>
 13 #include <linux/string.h>
 14 #include <linux/errno.h>
 15 #include <linux/skbuff.h>
 16 #include <net/netlink.h>
 17 #include <net/pkt_sched.h>
 18 
 19 struct mq_sched {
 20         struct Qdisc            **qdiscs;
 21 };
 22 
 23 static void mq_destroy(struct Qdisc *sch)
 24 {
 25         struct net_device *dev = qdisc_dev(sch);
 26         struct mq_sched *priv = qdisc_priv(sch);
 27         unsigned int ntx;
 28 
 29         if (!priv->qdiscs)
 30                 return;
 31         for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
 32                 qdisc_destroy(priv->qdiscs[ntx]);
 33         kfree(priv->qdiscs);
 34 }
 35 
 36 static int mq_init(struct Qdisc *sch, struct nlattr *opt)
 37 {
 38         struct net_device *dev = qdisc_dev(sch);
 39         struct mq_sched *priv = qdisc_priv(sch);
 40         struct netdev_queue *dev_queue;
 41         struct Qdisc *qdisc;
 42         unsigned int ntx;
 43 
 44         if (sch->parent != TC_H_ROOT)
 45                 return -EOPNOTSUPP;
 46 
 47         if (!netif_is_multiqueue(dev))
 48                 return -EOPNOTSUPP;
 49 
 50         /* pre-allocate qdiscs, attachment can't fail */
 51         priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
 52                                GFP_KERNEL);
 53         if (priv->qdiscs == NULL)
 54                 return -ENOMEM;
 55 
 56         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 57                 dev_queue = netdev_get_tx_queue(dev, ntx);
 58                 qdisc = qdisc_create_dflt(dev, dev_queue, &pfifo_fast_ops,
 59                                           TC_H_MAKE(TC_H_MAJ(sch->handle),
 60                                                     TC_H_MIN(ntx + 1)));
 61                 if (qdisc == NULL)
 62                         goto err;
 63                 qdisc->flags |= TCQ_F_CAN_BYPASS;
 64                 priv->qdiscs[ntx] = qdisc;
 65         }
 66 
 67         sch->flags |= TCQ_F_MQROOT;
 68         return 0;
 69 
 70 err:
 71         mq_destroy(sch);
 72         return -ENOMEM;
 73 }
 74 
 75 static void mq_attach(struct Qdisc *sch)
 76 {
 77         struct net_device *dev = qdisc_dev(sch);
 78         struct mq_sched *priv = qdisc_priv(sch);
 79         struct Qdisc *qdisc;
 80         unsigned int ntx;
 81 
 82         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 83                 qdisc = priv->qdiscs[ntx];
 84                 qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 85                 if (qdisc)
 86                         qdisc_destroy(qdisc);
 87         }
 88         kfree(priv->qdiscs);
 89         priv->qdiscs = NULL;
 90 }
 91 
 92 static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
 93 {
 94         struct net_device *dev = qdisc_dev(sch);
 95         struct Qdisc *qdisc;
 96         unsigned int ntx;
 97 
 98         sch->q.qlen = 0;
 99         memset(&sch->bstats, 0, sizeof(sch->bstats));
100         memset(&sch->qstats, 0, sizeof(sch->qstats));
101 
102         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
103                 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
104                 spin_lock_bh(qdisc_lock(qdisc));
105                 sch->q.qlen             += qdisc->q.qlen;
106                 sch->bstats.bytes       += qdisc->bstats.bytes;
107                 sch->bstats.packets     += qdisc->bstats.packets;
108                 sch->qstats.qlen        += qdisc->qstats.qlen;
109                 sch->qstats.backlog     += qdisc->qstats.backlog;
110                 sch->qstats.drops       += qdisc->qstats.drops;
111                 sch->qstats.requeues    += qdisc->qstats.requeues;
112                 sch->qstats.overlimits  += qdisc->qstats.overlimits;
113                 spin_unlock_bh(qdisc_lock(qdisc));
114         }
115         return 0;
116 }
117 
118 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
119 {
120         struct net_device *dev = qdisc_dev(sch);
121         unsigned long ntx = cl - 1;
122 
123         if (ntx >= dev->num_tx_queues)
124                 return NULL;
125         return netdev_get_tx_queue(dev, ntx);
126 }
127 
128 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
129                                             struct tcmsg *tcm)
130 {
131         unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
132         struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
133 
134         if (!dev_queue) {
135                 struct net_device *dev = qdisc_dev(sch);
136 
137                 return netdev_get_tx_queue(dev, 0);
138         }
139         return dev_queue;
140 }
141 
142 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
143                     struct Qdisc **old)
144 {
145         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
146         struct net_device *dev = qdisc_dev(sch);
147 
148         if (dev->flags & IFF_UP)
149                 dev_deactivate(dev);
150 
151         *old = dev_graft_qdisc(dev_queue, new);
152 
153         if (dev->flags & IFF_UP)
154                 dev_activate(dev);
155         return 0;
156 }
157 
158 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
159 {
160         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
161 
162         return dev_queue->qdisc_sleeping;
163 }
164 
165 static unsigned long mq_get(struct Qdisc *sch, u32 classid)
166 {
167         unsigned int ntx = TC_H_MIN(classid);
168 
169         if (!mq_queue_get(sch, ntx))
170                 return 0;
171         return ntx;
172 }
173 
174 static void mq_put(struct Qdisc *sch, unsigned long cl)
175 {
176         return;
177 }
178 
179 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
180                          struct sk_buff *skb, struct tcmsg *tcm)
181 {
182         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
183 
184         tcm->tcm_parent = TC_H_ROOT;
185         tcm->tcm_handle |= TC_H_MIN(cl);
186         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
187         return 0;
188 }
189 
190 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
191                                struct gnet_dump *d)
192 {
193         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
194 
195         sch = dev_queue->qdisc_sleeping;
196         sch->qstats.qlen = sch->q.qlen;
197         if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
198             gnet_stats_copy_queue(d, &sch->qstats) < 0)
199                 return -1;
200         return 0;
201 }
202 
203 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
204 {
205         struct net_device *dev = qdisc_dev(sch);
206         unsigned int ntx;
207 
208         if (arg->stop)
209                 return;
210 
211         arg->count = arg->skip;
212         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
213                 if (arg->fn(sch, ntx + 1, arg) < 0) {
214                         arg->stop = 1;
215                         break;
216                 }
217                 arg->count++;
218         }
219 }
220 
221 static const struct Qdisc_class_ops mq_class_ops = {
222         .select_queue   = mq_select_queue,
223         .graft          = mq_graft,
224         .leaf           = mq_leaf,
225         .get            = mq_get,
226         .put            = mq_put,
227         .walk           = mq_walk,
228         .dump           = mq_dump_class,
229         .dump_stats     = mq_dump_class_stats,
230 };
231 
232 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
233         .cl_ops         = &mq_class_ops,
234         .id             = "mq",
235         .priv_size      = sizeof(struct mq_sched),
236         .init           = mq_init,
237         .destroy        = mq_destroy,
238         .attach         = mq_attach,
239         .dump           = mq_dump,
240         .owner          = THIS_MODULE,
241 };
242 

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