net/sched/sch_mqprio.c

   1 /*
   2  * net/sched/sch_mqprio.c
   3  *
   4  * Copyright (c) 2010 John Fastabend <john.r.fastabend@intel.com>
   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/string.h>
  15 #include <linux/errno.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/module.h>
  18 #include <net/netlink.h>
  19 #include <net/pkt_sched.h>
  20 #include <net/sch_generic.h>
  21 #include <net/pkt_cls.h>
  22
  23 struct mqprio_sched {
  24         struct Qdisc            **qdiscs;
  25         u16 mode;
  26         u16 shaper;
  27         int hw_offload;
  28         u32 flags;
  29         u64 min_rate[TC_QOPT_MAX_QUEUE];
  30         u64 max_rate[TC_QOPT_MAX_QUEUE];
  31 };
  32
  33 static void mqprio_destroy(struct Qdisc *sch)
  34 {
  35         struct net_device *dev = qdisc_dev(sch);
  36         struct mqprio_sched *priv = qdisc_priv(sch);
  37         unsigned int ntx;
  38
  39         if (priv->qdiscs) {
  40                 for (ntx = 0;
  41                      ntx < dev->num_tx_queues && priv->qdiscs[ntx];
  42                      ntx++)
  43                         qdisc_destroy(priv->qdiscs[ntx]);
  44                 kfree(priv->qdiscs);
  45         }
  46
  47         if (priv->hw_offload && dev->netdev_ops->ndo_setup_tc) {
  48                 struct tc_mqprio_qopt_offload mqprio = { { 0 } };
  49
  50                 switch (priv->mode) {
  51                 case TC_MQPRIO_MODE_DCB:
  52                 case TC_MQPRIO_MODE_CHANNEL:
  53                         dev->netdev_ops->ndo_setup_tc(dev,
  54                                                       TC_SETUP_QDISC_MQPRIO,
  55                                                       &mqprio);
  56                         break;
  57                 default:
  58                         return;
  59                 }
  60         } else {
  61                 netdev_set_num_tc(dev, 0);
  62         }
  63 }
  64
  65 static int mqprio_parse_opt(struct net_device *dev, struct tc_mqprio_qopt *qopt)
  66 {
  67         int i, j;
  68
  69         /* Verify num_tc is not out of max range */
  70         if (qopt->num_tc > TC_MAX_QUEUE)
  71                 return -EINVAL;
  72
  73         /* Verify priority mapping uses valid tcs */
  74         for (i = 0; i < TC_BITMASK + 1; i++) {
  75                 if (qopt->prio_tc_map[i] >= qopt->num_tc)
  76                         return -EINVAL;
  77         }
  78
  79         /* Limit qopt->hw to maximum supported offload value.  Drivers have
  80          * the option of overriding this later if they don't support the a
  81          * given offload type.
  82          */
  83         if (qopt->hw > TC_MQPRIO_HW_OFFLOAD_MAX)
  84                 qopt->hw = TC_MQPRIO_HW_OFFLOAD_MAX;
  85
  86         /* If hardware offload is requested we will leave it to the device
  87          * to either populate the queue counts itself or to validate the
  88          * provided queue counts.  If ndo_setup_tc is not present then
  89          * hardware doesn't support offload and we should return an error.
  90          */
  91         if (qopt->hw)
  92                 return dev->netdev_ops->ndo_setup_tc ? 0 : -EINVAL;
  93
  94         for (i = 0; i < qopt->num_tc; i++) {
  95                 unsigned int last = qopt->offset[i] + qopt->count[i];
  96
  97                 /* Verify the queue count is in tx range being equal to the
  98                  * real_num_tx_queues indicates the last queue is in use.
  99                  */
 100                 if (qopt->offset[i] >= dev->real_num_tx_queues ||
 101                     !qopt->count[i] ||
 102                     last > dev->real_num_tx_queues)
 103                         return -EINVAL;
 104
 105                 /* Verify that the offset and counts do not overlap */
 106                 for (j = i + 1; j < qopt->num_tc; j++) {
 107                         if (last > qopt->offset[j])
 108                                 return -EINVAL;
 109                 }
 110         }
 111
 112         return 0;
 113 }
 114
 115 static const struct nla_policy mqprio_policy[TCA_MQPRIO_MAX + 1] = {
 116         [TCA_MQPRIO_MODE]       = { .len = sizeof(u16) },
 117         [TCA_MQPRIO_SHAPER]     = { .len = sizeof(u16) },
 118         [TCA_MQPRIO_MIN_RATE64] = { .type = NLA_NESTED },
 119         [TCA_MQPRIO_MAX_RATE64] = { .type = NLA_NESTED },
 120 };
 121
 122 static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
 123                       const struct nla_policy *policy, int len)
 124 {
 125         int nested_len = nla_len(nla) - NLA_ALIGN(len);
 126
 127         if (nested_len >= nla_attr_size(0))
 128                 return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len),
 129                                  nested_len, policy, NULL);
 130
 131         memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
 132         return 0;
 133 }
 134
 135 static int mqprio_init(struct Qdisc *sch, struct nlattr *opt)
 136 {
 137         struct net_device *dev = qdisc_dev(sch);
 138         struct mqprio_sched *priv = qdisc_priv(sch);
 139         struct netdev_queue *dev_queue;
 140         struct Qdisc *qdisc;
 141         int i, err = -EOPNOTSUPP;
 142         struct tc_mqprio_qopt *qopt = NULL;
 143         struct nlattr *tb[TCA_MQPRIO_MAX + 1];
 144         struct nlattr *attr;
 145         int rem;
 146         int len;
 147
 148         BUILD_BUG_ON(TC_MAX_QUEUE != TC_QOPT_MAX_QUEUE);
 149         BUILD_BUG_ON(TC_BITMASK != TC_QOPT_BITMASK);
 150
 151         if (sch->parent != TC_H_ROOT)
 152                 return -EOPNOTSUPP;
 153
 154         if (!netif_is_multiqueue(dev))
 155                 return -EOPNOTSUPP;
 156
 157         /* make certain can allocate enough classids to handle queues */
 158         if (dev->num_tx_queues >= TC_H_MIN_PRIORITY)
 159                 return -ENOMEM;
 160
 161         if (!opt || nla_len(opt) < sizeof(*qopt))
 162                 return -EINVAL;
 163
 164         qopt = nla_data(opt);
 165         if (mqprio_parse_opt(dev, qopt))
 166                 return -EINVAL;
 167
 168         len = nla_len(opt) - NLA_ALIGN(sizeof(*qopt));
 169         if (len > 0) {
 170                 err = parse_attr(tb, TCA_MQPRIO_MAX, opt, mqprio_policy,
 171                                  sizeof(*qopt));
 172                 if (err < 0)
 173                         return err;
 174
 175                 if (!qopt->hw)
 176                         return -EINVAL;
 177
 178                 if (tb[TCA_MQPRIO_MODE]) {
 179                         priv->flags |= TC_MQPRIO_F_MODE;
 180                         priv->mode = *(u16 *)nla_data(tb[TCA_MQPRIO_MODE]);
 181                 }
 182
 183                 if (tb[TCA_MQPRIO_SHAPER]) {
 184                         priv->flags |= TC_MQPRIO_F_SHAPER;
 185                         priv->shaper = *(u16 *)nla_data(tb[TCA_MQPRIO_SHAPER]);
 186                 }
 187
 188                 if (tb[TCA_MQPRIO_MIN_RATE64]) {
 189                         if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
 190                                 return -EINVAL;
 191                         i = 0;
 192                         nla_for_each_nested(attr, tb[TCA_MQPRIO_MIN_RATE64],
 193                                             rem) {
 194                                 if (nla_type(attr) != TCA_MQPRIO_MIN_RATE64)
 195                                         return -EINVAL;
 196                                 if (i >= qopt->num_tc)
 197                                         break;
 198                                 priv->min_rate[i] = *(u64 *)nla_data(attr);
 199                                 i++;
 200                         }
 201                         priv->flags |= TC_MQPRIO_F_MIN_RATE;
 202                 }
 203
 204                 if (tb[TCA_MQPRIO_MAX_RATE64]) {
 205                         if (priv->shaper != TC_MQPRIO_SHAPER_BW_RATE)
 206                                 return -EINVAL;
 207                         i = 0;
 208                         nla_for_each_nested(attr, tb[TCA_MQPRIO_MAX_RATE64],
 209                                             rem) {
 210                                 if (nla_type(attr) != TCA_MQPRIO_MAX_RATE64)
 211                                         return -EINVAL;
 212                                 if (i >= qopt->num_tc)
 213                                         break;
 214                                 priv->max_rate[i] = *(u64 *)nla_data(attr);
 215                                 i++;
 216                         }
 217                         priv->flags |= TC_MQPRIO_F_MAX_RATE;
 218                 }
 219         }
 220
 221         /* pre-allocate qdisc, attachment can't fail */
 222         priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
 223                                GFP_KERNEL);
 224         if (!priv->qdiscs)
 225                 return -ENOMEM;
 226
 227         for (i = 0; i < dev->num_tx_queues; i++) {
 228                 dev_queue = netdev_get_tx_queue(dev, i);
 229                 qdisc = qdisc_create_dflt(dev_queue,
 230                                           get_default_qdisc_ops(dev, i),
 231                                           TC_H_MAKE(TC_H_MAJ(sch->handle),
 232                                                     TC_H_MIN(i + 1)));
 233                 if (!qdisc)
 234                         return -ENOMEM;
 235
 236                 priv->qdiscs[i] = qdisc;
 237                 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
 238         }
 239
 240         /* If the mqprio options indicate that hardware should own
 241          * the queue mapping then run ndo_setup_tc otherwise use the
 242          * supplied and verified mapping
 243          */
 244         if (qopt->hw) {
 245                 struct tc_mqprio_qopt_offload mqprio = {.qopt = *qopt};
 246
 247                 switch (priv->mode) {
 248                 case TC_MQPRIO_MODE_DCB:
 249                         if (priv->shaper != TC_MQPRIO_SHAPER_DCB)
 250                                 return -EINVAL;
 251                         break;
 252                 case TC_MQPRIO_MODE_CHANNEL:
 253                         mqprio.flags = priv->flags;
 254                         if (priv->flags & TC_MQPRIO_F_MODE)
 255                                 mqprio.mode = priv->mode;
 256                         if (priv->flags & TC_MQPRIO_F_SHAPER)
 257                                 mqprio.shaper = priv->shaper;
 258                         if (priv->flags & TC_MQPRIO_F_MIN_RATE)
 259                                 for (i = 0; i < mqprio.qopt.num_tc; i++)
 260                                         mqprio.min_rate[i] = priv->min_rate[i];
 261                         if (priv->flags & TC_MQPRIO_F_MAX_RATE)
 262                                 for (i = 0; i < mqprio.qopt.num_tc; i++)
 263                                         mqprio.max_rate[i] = priv->max_rate[i];
 264                         break;
 265                 default:
 266                         return -EINVAL;
 267                 }
 268                 err = dev->netdev_ops->ndo_setup_tc(dev,
 269                                                     TC_SETUP_QDISC_MQPRIO,
 270                                                     &mqprio);
 271                 if (err)
 272                         return err;
 273
 274                 priv->hw_offload = mqprio.qopt.hw;
 275         } else {
 276                 netdev_set_num_tc(dev, qopt->num_tc);
 277                 for (i = 0; i < qopt->num_tc; i++)
 278                         netdev_set_tc_queue(dev, i,
 279                                             qopt->count[i], qopt->offset[i]);
 280         }
 281
 282         /* Always use supplied priority mappings */
 283         for (i = 0; i < TC_BITMASK + 1; i++)
 284                 netdev_set_prio_tc_map(dev, i, qopt->prio_tc_map[i]);
 285
 286         sch->flags |= TCQ_F_MQROOT;
 287         return 0;
 288 }
 289
 290 static void mqprio_attach(struct Qdisc *sch)
 291 {
 292         struct net_device *dev = qdisc_dev(sch);
 293         struct mqprio_sched *priv = qdisc_priv(sch);
 294         struct Qdisc *qdisc, *old;
 295         unsigned int ntx;
 296
 297         /* Attach underlying qdisc */
 298         for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
 299                 qdisc = priv->qdiscs[ntx];
 300                 old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 301                 if (old)
 302                         qdisc_destroy(old);
 303                 if (ntx < dev->real_num_tx_queues)
 304                         qdisc_hash_add(qdisc, false);
 305         }
 306         kfree(priv->qdiscs);
 307         priv->qdiscs = NULL;
 308 }
 309
 310 static struct netdev_queue *mqprio_queue_get(struct Qdisc *sch,
 311                                              unsigned long cl)
 312 {
 313         struct net_device *dev = qdisc_dev(sch);
 314         unsigned long ntx = cl - 1;
 315
 316         if (ntx >= dev->num_tx_queues)
 317                 return NULL;
 318         return netdev_get_tx_queue(dev, ntx);
 319 }
 320
 321 static int mqprio_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
 322                     struct Qdisc **old)
 323 {
 324         struct net_device *dev = qdisc_dev(sch);
 325         struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
 326
 327         if (!dev_queue)
 328                 return -EINVAL;
 329
 330         if (dev->flags & IFF_UP)
 331                 dev_deactivate(dev);
 332
 333         *old = dev_graft_qdisc(dev_queue, new);
 334
 335         if (new)
 336                 new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
 337
 338         if (dev->flags & IFF_UP)
 339                 dev_activate(dev);
 340
 341         return 0;
 342 }
 343
 344 static int dump_rates(struct mqprio_sched *priv,
 345                       struct tc_mqprio_qopt *opt, struct sk_buff *skb)
 346 {
 347         struct nlattr *nest;
 348         int i;
 349
 350         if (priv->flags & TC_MQPRIO_F_MIN_RATE) {
 351                 nest = nla_nest_start(skb, TCA_MQPRIO_MIN_RATE64);
 352                 if (!nest)
 353                         goto nla_put_failure;
 354
 355                 for (i = 0; i < opt->num_tc; i++) {
 356                         if (nla_put(skb, TCA_MQPRIO_MIN_RATE64,
 357                                     sizeof(priv->min_rate[i]),
 358                                     &priv->min_rate[i]))
 359                                 goto nla_put_failure;
 360                 }
 361                 nla_nest_end(skb, nest);
 362         }
 363
 364         if (priv->flags & TC_MQPRIO_F_MAX_RATE) {
 365                 nest = nla_nest_start(skb, TCA_MQPRIO_MAX_RATE64);
 366                 if (!nest)
 367                         goto nla_put_failure;
 368
 369                 for (i = 0; i < opt->num_tc; i++) {
 370                         if (nla_put(skb, TCA_MQPRIO_MAX_RATE64,
 371                                     sizeof(priv->max_rate[i]),
 372                                     &priv->max_rate[i]))
 373                                 goto nla_put_failure;
 374                 }
 375                 nla_nest_end(skb, nest);
 376         }
 377         return 0;
 378
 379 nla_put_failure:
 380         nla_nest_cancel(skb, nest);
 381         return -1;
 382 }
 383
 384 static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
 385 {
 386         struct net_device *dev = qdisc_dev(sch);
 387         struct mqprio_sched *priv = qdisc_priv(sch);
 388         struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
 389         struct tc_mqprio_qopt opt = { 0 };
 390         struct Qdisc *qdisc;
 391         unsigned int i;
 392
 393         sch->q.qlen = 0;
 394         memset(&sch->bstats, 0, sizeof(sch->bstats));
 395         memset(&sch->qstats, 0, sizeof(sch->qstats));
 396
 397         for (i = 0; i < dev->num_tx_queues; i++) {
 398                 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
 399                 spin_lock_bh(qdisc_lock(qdisc));
 400                 sch->q.qlen             += qdisc->q.qlen;
 401                 sch->bstats.bytes       += qdisc->bstats.bytes;
 402                 sch->bstats.packets     += qdisc->bstats.packets;
 403                 sch->qstats.backlog     += qdisc->qstats.backlog;
 404                 sch->qstats.drops       += qdisc->qstats.drops;
 405                 sch->qstats.requeues    += qdisc->qstats.requeues;
 406                 sch->qstats.overlimits  += qdisc->qstats.overlimits;
 407                 spin_unlock_bh(qdisc_lock(qdisc));
 408         }
 409
 410         opt.num_tc = netdev_get_num_tc(dev);
 411         memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
 412         opt.hw = priv->hw_offload;
 413
 414         for (i = 0; i < netdev_get_num_tc(dev); i++) {
 415                 opt.count[i] = dev->tc_to_txq[i].count;
 416                 opt.offset[i] = dev->tc_to_txq[i].offset;
 417         }
 418
 419         if (nla_put(skb, TCA_OPTIONS, NLA_ALIGN(sizeof(opt)), &opt))
 420                 goto nla_put_failure;
 421
 422         if ((priv->flags & TC_MQPRIO_F_MODE) &&
 423             nla_put_u16(skb, TCA_MQPRIO_MODE, priv->mode))
 424                 goto nla_put_failure;
 425
 426         if ((priv->flags & TC_MQPRIO_F_SHAPER) &&
 427             nla_put_u16(skb, TCA_MQPRIO_SHAPER, priv->shaper))
 428                 goto nla_put_failure;
 429
 430         if ((priv->flags & TC_MQPRIO_F_MIN_RATE ||
 431              priv->flags & TC_MQPRIO_F_MAX_RATE) &&
 432             (dump_rates(priv, &opt, skb) != 0))
 433                 goto nla_put_failure;
 434
 435         return nla_nest_end(skb, nla);
 436 nla_put_failure:
 437         nlmsg_trim(skb, nla);
 438         return -1;
 439 }
 440
 441 static struct Qdisc *mqprio_leaf(struct Qdisc *sch, unsigned long cl)
 442 {
 443         struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
 444
 445         if (!dev_queue)
 446                 return NULL;
 447
 448         return dev_queue->qdisc_sleeping;
 449 }
 450
 451 static unsigned long mqprio_find(struct Qdisc *sch, u32 classid)
 452 {
 453         struct net_device *dev = qdisc_dev(sch);
 454         unsigned int ntx = TC_H_MIN(classid);
 455
 456         /* There are essentially two regions here that have valid classid
 457          * values. The first region will have a classid value of 1 through
 458          * num_tx_queues. All of these are backed by actual Qdiscs.
 459          */
 460         if (ntx < TC_H_MIN_PRIORITY)
 461                 return (ntx <= dev->num_tx_queues) ? ntx : 0;
 462
 463         /* The second region represents the hardware traffic classes. These
 464          * are represented by classid values of TC_H_MIN_PRIORITY through
 465          * TC_H_MIN_PRIORITY + netdev_get_num_tc - 1
 466          */
 467         return ((ntx - TC_H_MIN_PRIORITY) < netdev_get_num_tc(dev)) ? ntx : 0;
 468 }
 469
 470 static int mqprio_dump_class(struct Qdisc *sch, unsigned long cl,
 471                          struct sk_buff *skb, struct tcmsg *tcm)
 472 {
 473         if (cl < TC_H_MIN_PRIORITY) {
 474                 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
 475                 struct net_device *dev = qdisc_dev(sch);
 476                 int tc = netdev_txq_to_tc(dev, cl - 1);
 477
 478                 tcm->tcm_parent = (tc < 0) ? 0 :
 479                         TC_H_MAKE(TC_H_MAJ(sch->handle),
 480                                   TC_H_MIN(tc + TC_H_MIN_PRIORITY));
 481                 tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
 482         } else {
 483                 tcm->tcm_parent = TC_H_ROOT;
 484                 tcm->tcm_info = 0;
 485         }
 486         tcm->tcm_handle |= TC_H_MIN(cl);
 487         return 0;
 488 }
 489
 490 static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 491                                    struct gnet_dump *d)
 492         __releases(d->lock)
 493         __acquires(d->lock)
 494 {
 495         if (cl >= TC_H_MIN_PRIORITY) {
 496                 int i;
 497                 __u32 qlen = 0;
 498                 struct Qdisc *qdisc;
 499                 struct gnet_stats_queue qstats = {0};
 500                 struct gnet_stats_basic_packed bstats = {0};
 501                 struct net_device *dev = qdisc_dev(sch);
 502                 struct netdev_tc_txq tc = dev->tc_to_txq[cl & TC_BITMASK];
 503
 504                 /* Drop lock here it will be reclaimed before touching
 505                  * statistics this is required because the d->lock we
 506                  * hold here is the look on dev_queue->qdisc_sleeping
 507                  * also acquired below.
 508                  */
 509                 if (d->lock)
 510                         spin_unlock_bh(d->lock);
 511
 512                 for (i = tc.offset; i < tc.offset + tc.count; i++) {
 513                         struct netdev_queue *q = netdev_get_tx_queue(dev, i);
 514
 515                         qdisc = rtnl_dereference(q->qdisc);
 516                         spin_lock_bh(qdisc_lock(qdisc));
 517                         qlen              += qdisc->q.qlen;
 518                         bstats.bytes      += qdisc->bstats.bytes;
 519                         bstats.packets    += qdisc->bstats.packets;
 520                         qstats.backlog    += qdisc->qstats.backlog;
 521                         qstats.drops      += qdisc->qstats.drops;
 522                         qstats.requeues   += qdisc->qstats.requeues;
 523                         qstats.overlimits += qdisc->qstats.overlimits;
 524                         spin_unlock_bh(qdisc_lock(qdisc));
 525                 }
 526                 /* Reclaim root sleeping lock before completing stats */
 527                 if (d->lock)
 528                         spin_lock_bh(d->lock);
 529                 if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
 530                     gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
 531                         return -1;
 532         } else {
 533                 struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
 534
 535                 sch = dev_queue->qdisc_sleeping;
 536                 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
 537                                           d, NULL, &sch->bstats) < 0 ||
 538                     gnet_stats_copy_queue(d, NULL,
 539                                           &sch->qstats, sch->q.qlen) < 0)
 540                         return -1;
 541         }
 542         return 0;
 543 }
 544
 545 static void mqprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 546 {
 547         struct net_device *dev = qdisc_dev(sch);
 548         unsigned long ntx;
 549
 550         if (arg->stop)
 551                 return;
 552
 553         /* Walk hierarchy with a virtual class per tc */
 554         arg->count = arg->skip;
 555         for (ntx = arg->skip; ntx < netdev_get_num_tc(dev); ntx++) {
 556                 if (arg->fn(sch, ntx + TC_H_MIN_PRIORITY, arg) < 0) {
 557                         arg->stop = 1;
 558                         return;
 559                 }
 560                 arg->count++;
 561         }
 562
 563         /* Pad the values and skip over unused traffic classes */
 564         if (ntx < TC_MAX_QUEUE) {
 565                 arg->count = TC_MAX_QUEUE;
 566                 ntx = TC_MAX_QUEUE;
 567         }
 568
 569         /* Reset offset, sort out remaining per-queue qdiscs */
 570         for (ntx -= TC_MAX_QUEUE; ntx < dev->num_tx_queues; ntx++) {
 571                 if (arg->fn(sch, ntx + 1, arg) < 0) {
 572                         arg->stop = 1;
 573                         return;
 574                 }
 575                 arg->count++;
 576         }
 577 }
 578
 579 static struct netdev_queue *mqprio_select_queue(struct Qdisc *sch,
 580                                                 struct tcmsg *tcm)
 581 {
 582         return mqprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
 583 }
 584
 585 static const struct Qdisc_class_ops mqprio_class_ops = {
 586         .graft          = mqprio_graft,
 587         .leaf           = mqprio_leaf,
 588         .find           = mqprio_find,
 589         .walk           = mqprio_walk,
 590         .dump           = mqprio_dump_class,
 591         .dump_stats     = mqprio_dump_class_stats,
 592         .select_queue   = mqprio_select_queue,
 593 };
 594
 595 static struct Qdisc_ops mqprio_qdisc_ops __read_mostly = {
 596         .cl_ops         = &mqprio_class_ops,
 597         .id             = "mqprio",
 598         .priv_size      = sizeof(struct mqprio_sched),
 599         .init           = mqprio_init,
 600         .destroy        = mqprio_destroy,
 601         .attach         = mqprio_attach,
 602         .dump           = mqprio_dump,
 603         .owner          = THIS_MODULE,
 604 };
 605
 606 static int __init mqprio_module_init(void)
 607 {
 608         return register_qdisc(&mqprio_qdisc_ops);
 609 }
 610
 611 static void __exit mqprio_module_exit(void)
 612 {
 613         unregister_qdisc(&mqprio_qdisc_ops);
 614 }
 615
 616 module_init(mqprio_module_init);
 617 module_exit(mqprio_module_exit);
 618
 619 MODULE_LICENSE("GPL");