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TOMOYO Linux Cross Reference
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)
 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)
 64                         return -ENOMEM;
 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 
 73 static void mq_attach(struct Qdisc *sch)
 74 {
 75         struct net_device *dev = qdisc_dev(sch);
 76         struct mq_sched *priv = qdisc_priv(sch);
 77         struct Qdisc *qdisc, *old;
 78         unsigned int ntx;
 79 
 80         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 81                 qdisc = priv->qdiscs[ntx];
 82                 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 83                 if (old)
 84                         qdisc_destroy(old);
 85 #ifdef CONFIG_NET_SCHED
 86                 if (ntx < dev->real_num_tx_queues)
 87                         qdisc_hash_add(qdisc, false);
 88 #endif
 89 
 90         }
 91         kfree(priv->qdiscs);
 92         priv->qdiscs = NULL;
 93 }
 94 
 95 static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
 96 {
 97         struct net_device *dev = qdisc_dev(sch);
 98         struct Qdisc *qdisc;
 99         unsigned int ntx;
100 
101         sch->q.qlen = 0;
102         memset(&sch->bstats, 0, sizeof(sch->bstats));
103         memset(&sch->qstats, 0, sizeof(sch->qstats));
104 
105         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
106                 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
107                 spin_lock_bh(qdisc_lock(qdisc));
108                 sch->q.qlen             += qdisc->q.qlen;
109                 sch->bstats.bytes       += qdisc->bstats.bytes;
110                 sch->bstats.packets     += qdisc->bstats.packets;
111                 sch->qstats.backlog     += qdisc->qstats.backlog;
112                 sch->qstats.drops       += qdisc->qstats.drops;
113                 sch->qstats.requeues    += qdisc->qstats.requeues;
114                 sch->qstats.overlimits  += qdisc->qstats.overlimits;
115                 spin_unlock_bh(qdisc_lock(qdisc));
116         }
117         return 0;
118 }
119 
120 static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
121 {
122         struct net_device *dev = qdisc_dev(sch);
123         unsigned long ntx = cl - 1;
124 
125         if (ntx >= dev->num_tx_queues)
126                 return NULL;
127         return netdev_get_tx_queue(dev, ntx);
128 }
129 
130 static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
131                                             struct tcmsg *tcm)
132 {
133         return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
134 }
135 
136 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
137                     struct Qdisc **old)
138 {
139         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
140         struct net_device *dev = qdisc_dev(sch);
141 
142         if (dev->flags & IFF_UP)
143                 dev_deactivate(dev);
144 
145         *old = dev_graft_qdisc(dev_queue, new);
146         if (new)
147                 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
148         if (dev->flags & IFF_UP)
149                 dev_activate(dev);
150         return 0;
151 }
152 
153 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
154 {
155         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
156 
157         return dev_queue->qdisc_sleeping;
158 }
159 
160 static unsigned long mq_find(struct Qdisc *sch, u32 classid)
161 {
162         unsigned int ntx = TC_H_MIN(classid);
163 
164         if (!mq_queue_get(sch, ntx))
165                 return 0;
166         return ntx;
167 }
168 
169 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
170                          struct sk_buff *skb, struct tcmsg *tcm)
171 {
172         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
173 
174         tcm->tcm_parent = TC_H_ROOT;
175         tcm->tcm_handle |= TC_H_MIN(cl);
176         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
177         return 0;
178 }
179 
180 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
181                                struct gnet_dump *d)
182 {
183         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
184 
185         sch = dev_queue->qdisc_sleeping;
186         if (gnet_stats_copy_basic(&sch->running, d, NULL, &sch->bstats) < 0 ||
187             gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0)
188                 return -1;
189         return 0;
190 }
191 
192 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
193 {
194         struct net_device *dev = qdisc_dev(sch);
195         unsigned int ntx;
196 
197         if (arg->stop)
198                 return;
199 
200         arg->count = arg->skip;
201         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
202                 if (arg->fn(sch, ntx + 1, arg) < 0) {
203                         arg->stop = 1;
204                         break;
205                 }
206                 arg->count++;
207         }
208 }
209 
210 static const struct Qdisc_class_ops mq_class_ops = {
211         .select_queue   = mq_select_queue,
212         .graft          = mq_graft,
213         .leaf           = mq_leaf,
214         .find           = mq_find,
215         .walk           = mq_walk,
216         .dump           = mq_dump_class,
217         .dump_stats     = mq_dump_class_stats,
218 };
219 
220 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
221         .cl_ops         = &mq_class_ops,
222         .id             = "mq",
223         .priv_size      = sizeof(struct mq_sched),
224         .init           = mq_init,
225         .destroy        = mq_destroy,
226         .attach         = mq_attach,
227         .dump           = mq_dump,
228         .owner          = THIS_MODULE,
229 };
230 

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