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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, &pfifo_fast_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;
 82         unsigned int ntx;
 83 
 84         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 85                 qdisc = priv->qdiscs[ntx];
 86                 qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 87                 if (qdisc)
 88                         qdisc_destroy(qdisc);
 89         }
 90         kfree(priv->qdiscs);
 91         priv->qdiscs = NULL;
 92 }
 93 
 94 static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
 95 {
 96         struct net_device *dev = qdisc_dev(sch);
 97         struct Qdisc *qdisc;
 98         unsigned int ntx;
 99 
100         sch->q.qlen = 0;
101         memset(&sch->bstats, 0, sizeof(sch->bstats));
102         memset(&sch->qstats, 0, sizeof(sch->qstats));
103 
104         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
105                 qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
106                 spin_lock_bh(qdisc_lock(qdisc));
107                 sch->q.qlen             += qdisc->q.qlen;
108                 sch->bstats.bytes       += qdisc->bstats.bytes;
109                 sch->bstats.packets     += qdisc->bstats.packets;
110                 sch->qstats.qlen        += qdisc->qstats.qlen;
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         unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
134         struct netdev_queue *dev_queue = mq_queue_get(sch, ntx);
135 
136         if (!dev_queue) {
137                 struct net_device *dev = qdisc_dev(sch);
138 
139                 return netdev_get_tx_queue(dev, 0);
140         }
141         return dev_queue;
142 }
143 
144 static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
145                     struct Qdisc **old)
146 {
147         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
148         struct net_device *dev = qdisc_dev(sch);
149 
150         if (dev->flags & IFF_UP)
151                 dev_deactivate(dev);
152 
153         *old = dev_graft_qdisc(dev_queue, new);
154         if (new)
155                 new->flags |= TCQ_F_ONETXQUEUE;
156         if (dev->flags & IFF_UP)
157                 dev_activate(dev);
158         return 0;
159 }
160 
161 static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
162 {
163         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
164 
165         return dev_queue->qdisc_sleeping;
166 }
167 
168 static unsigned long mq_get(struct Qdisc *sch, u32 classid)
169 {
170         unsigned int ntx = TC_H_MIN(classid);
171 
172         if (!mq_queue_get(sch, ntx))
173                 return 0;
174         return ntx;
175 }
176 
177 static void mq_put(struct Qdisc *sch, unsigned long cl)
178 {
179 }
180 
181 static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
182                          struct sk_buff *skb, struct tcmsg *tcm)
183 {
184         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
185 
186         tcm->tcm_parent = TC_H_ROOT;
187         tcm->tcm_handle |= TC_H_MIN(cl);
188         tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
189         return 0;
190 }
191 
192 static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
193                                struct gnet_dump *d)
194 {
195         struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
196 
197         sch = dev_queue->qdisc_sleeping;
198         sch->qstats.qlen = sch->q.qlen;
199         if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
200             gnet_stats_copy_queue(d, &sch->qstats) < 0)
201                 return -1;
202         return 0;
203 }
204 
205 static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
206 {
207         struct net_device *dev = qdisc_dev(sch);
208         unsigned int ntx;
209 
210         if (arg->stop)
211                 return;
212 
213         arg->count = arg->skip;
214         for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
215                 if (arg->fn(sch, ntx + 1, arg) < 0) {
216                         arg->stop = 1;
217                         break;
218                 }
219                 arg->count++;
220         }
221 }
222 
223 static const struct Qdisc_class_ops mq_class_ops = {
224         .select_queue   = mq_select_queue,
225         .graft          = mq_graft,
226         .leaf           = mq_leaf,
227         .get            = mq_get,
228         .put            = mq_put,
229         .walk           = mq_walk,
230         .dump           = mq_dump_class,
231         .dump_stats     = mq_dump_class_stats,
232 };
233 
234 struct Qdisc_ops mq_qdisc_ops __read_mostly = {
235         .cl_ops         = &mq_class_ops,
236         .id             = "mq",
237         .priv_size      = sizeof(struct mq_sched),
238         .init           = mq_init,
239         .destroy        = mq_destroy,
240         .attach         = mq_attach,
241         .dump           = mq_dump,
242         .owner          = THIS_MODULE,
243 };
244 

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