sys/net/ifq_var.h

   1 /*-
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *    the documentation and/or other materials provided with the
  13  *    distribution.
  14  * 3. Neither the name of The DragonFly Project nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific, prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef _NET_IFQ_VAR_H_
  33 #define _NET_IFQ_VAR_H_
  34
  35 #ifndef _KERNEL
  36 #error "This file should not be included by userland programs."
  37 #endif
  38
  39 #ifndef _SYS_SYSTM_H_
  40 #include <sys/systm.h>
  41 #endif
  42 #ifndef _SYS_THREAD2_H_
  43 #include <sys/thread2.h>
  44 #endif
  45 #ifndef _SYS_SERIALIZE_H_
  46 #include <sys/serialize.h>
  47 #endif
  48 #ifndef _SYS_MBUF_H_
  49 #include <sys/mbuf.h>
  50 #endif
  51 #ifndef _NET_IF_VAR_H_
  52 #include <net/if_var.h>
  53 #endif
  54 #ifndef _NET_ALTQ_IF_ALTQ_H_
  55 #include <net/altq/if_altq.h>
  56 #endif
  57
  58 #define ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq) \
  59         KASSERT(ifsq_get_ifp((ifsq)) == (ifp) && \
  60             ifsq_get_index((ifsq)) == ALTQ_SUBQ_INDEX_DEFAULT, \
  61             ("not ifp's default subqueue"));
  62
  63 struct ifaltq;
  64 struct ifaltq_subque;
  65
  66 /*
  67  * Subqueue watchdog
  68  */
  69 typedef void    (*ifsq_watchdog_t)(struct ifaltq_subque *);
  70
  71 struct ifsubq_watchdog {
  72         struct callout  wd_callout;
  73         int             wd_timer;
  74         struct ifaltq_subque *wd_subq;
  75         ifsq_watchdog_t wd_watchdog;
  76 };
  77
  78 /*
  79  * Support for "classic" ALTQ interfaces.
  80  */
  81 int             ifsq_classic_enqueue(struct ifaltq_subque *, struct mbuf *,
  82                     struct altq_pktattr *);
  83 struct mbuf     *ifsq_classic_dequeue(struct ifaltq_subque *, int);
  84 int             ifsq_classic_request(struct ifaltq_subque *, int, void *);
  85 void            ifq_set_classic(struct ifaltq *);
  86
  87 void            ifq_set_maxlen(struct ifaltq *, int);
  88 void            ifq_set_methods(struct ifaltq *, altq_mapsubq_t,
  89                     ifsq_enqueue_t, ifsq_dequeue_t, ifsq_request_t);
  90 int             ifq_mapsubq_default(struct ifaltq *, int);
  91 int             ifq_mapsubq_modulo(struct ifaltq *, int);
  92
  93 void            ifsq_devstart(struct ifaltq_subque *ifsq);
  94 void            ifsq_devstart_sched(struct ifaltq_subque *ifsq);
  95
  96 void            ifsq_watchdog_init(struct ifsubq_watchdog *,
  97                     struct ifaltq_subque *, ifsq_watchdog_t);
  98 void            ifsq_watchdog_start(struct ifsubq_watchdog *);
  99 void            ifsq_watchdog_stop(struct ifsubq_watchdog *);
 100
 101 /*
 102  * Dispatch a packet to an interface.
 103  */
 104 int             ifq_dispatch(struct ifnet *, struct mbuf *,
 105                     struct altq_pktattr *);
 106
 107 #ifdef ALTQ
 108
 109 static __inline int
 110 ifq_is_enabled(struct ifaltq *_ifq)
 111 {
 112         return(_ifq->altq_flags & ALTQF_ENABLED);
 113 }
 114
 115 static __inline int
 116 ifq_is_attached(struct ifaltq *_ifq)
 117 {
 118         return(_ifq->altq_disc != NULL);
 119 }
 120
 121 #else   /* !ALTQ */
 122
 123 static __inline int
 124 ifq_is_enabled(struct ifaltq *_ifq)
 125 {
 126         return(0);
 127 }
 128
 129 static __inline int
 130 ifq_is_attached(struct ifaltq *_ifq)
 131 {
 132         return(0);
 133 }
 134
 135 #endif  /* ALTQ */
 136
 137 static __inline int
 138 ifq_is_ready(struct ifaltq *_ifq)
 139 {
 140         return(_ifq->altq_flags & ALTQF_READY);
 141 }
 142
 143 static __inline void
 144 ifq_set_ready(struct ifaltq *_ifq)
 145 {
 146         _ifq->altq_flags |= ALTQF_READY;
 147 }
 148
 149 /*
 150  * Subqueue lock must be held
 151  */
 152 static __inline int
 153 ifsq_enqueue_locked(struct ifaltq_subque *_ifsq, struct mbuf *_m,
 154     struct altq_pktattr *_pa)
 155 {
 156 #ifdef ALTQ
 157         if (!ifq_is_enabled(_ifsq->ifsq_altq))
 158                 return ifsq_classic_enqueue(_ifsq, _m, _pa);
 159         else
 160 #endif
 161         return _ifsq->ifsq_enqueue(_ifsq, _m, _pa);
 162 }
 163
 164 static __inline int
 165 ifsq_enqueue(struct ifaltq_subque *_ifsq, struct mbuf *_m,
 166     struct altq_pktattr *_pa)
 167 {
 168         int _error;
 169
 170         ALTQ_SQ_LOCK(_ifsq);
 171         _error = ifsq_enqueue_locked(_ifsq, _m, _pa);
 172         ALTQ_SQ_UNLOCK(_ifsq);
 173         return _error;
 174 }
 175
 176 static __inline struct mbuf *
 177 ifsq_dequeue(struct ifaltq_subque *_ifsq)
 178 {
 179         struct mbuf *_m;
 180
 181         ALTQ_SQ_LOCK(_ifsq);
 182         if (_ifsq->ifsq_prepended != NULL) {
 183                 _m = _ifsq->ifsq_prepended;
 184                 _ifsq->ifsq_prepended = NULL;
 185                 ALTQ_SQ_CNTR_DEC(_ifsq, _m->m_pkthdr.len);
 186                 ALTQ_SQ_UNLOCK(_ifsq);
 187                 return _m;
 188         }
 189
 190 #ifdef ALTQ
 191         if (_ifsq->ifsq_altq->altq_tbr != NULL)
 192                 _m = tbr_dequeue(_ifsq, ALTDQ_REMOVE);
 193         else if (!ifq_is_enabled(_ifsq->ifsq_altq))
 194                 _m = ifsq_classic_dequeue(_ifsq, ALTDQ_REMOVE);
 195         else
 196 #endif
 197         _m = _ifsq->ifsq_dequeue(_ifsq, ALTDQ_REMOVE);
 198         ALTQ_SQ_UNLOCK(_ifsq);
 199         return _m;
 200 }
 201
 202 /*
 203  * Subqueue lock must be held
 204  */
 205 static __inline struct mbuf *
 206 ifsq_poll_locked(struct ifaltq_subque *_ifsq)
 207 {
 208         if (_ifsq->ifsq_prepended != NULL)
 209                 return _ifsq->ifsq_prepended;
 210
 211 #ifdef ALTQ
 212         if (_ifsq->ifsq_altq->altq_tbr != NULL)
 213                 return tbr_dequeue(_ifsq, ALTDQ_POLL);
 214         else if (!ifq_is_enabled(_ifsq->ifsq_altq))
 215                 return ifsq_classic_dequeue(_ifsq, ALTDQ_POLL);
 216         else
 217 #endif
 218         return _ifsq->ifsq_dequeue(_ifsq, ALTDQ_POLL);
 219 }
 220
 221 static __inline struct mbuf *
 222 ifsq_poll(struct ifaltq_subque *_ifsq)
 223 {
 224         struct mbuf *_m;
 225
 226         ALTQ_SQ_LOCK(_ifsq);
 227         _m = ifsq_poll_locked(_ifsq);
 228         ALTQ_SQ_UNLOCK(_ifsq);
 229         return _m;
 230 }
 231
 232 static __inline int
 233 ifsq_poll_pktlen(struct ifaltq_subque *_ifsq)
 234 {
 235         struct mbuf *_m;
 236         int _len = 0;
 237
 238         ALTQ_SQ_LOCK(_ifsq);
 239
 240         _m = ifsq_poll_locked(_ifsq);
 241         if (_m != NULL) {
 242                 M_ASSERTPKTHDR(_m);
 243                 _len = _m->m_pkthdr.len;
 244         }
 245
 246         ALTQ_SQ_UNLOCK(_ifsq);
 247
 248         return _len;
 249 }
 250
 251 /*
 252  * Subqueue lock must be held
 253  */
 254 static __inline void
 255 ifsq_purge_locked(struct ifaltq_subque *_ifsq)
 256 {
 257         if (_ifsq->ifsq_prepended != NULL) {
 258                 ALTQ_SQ_CNTR_DEC(_ifsq, _ifsq->ifsq_prepended->m_pkthdr.len);
 259                 m_freem(_ifsq->ifsq_prepended);
 260                 _ifsq->ifsq_prepended = NULL;
 261         }
 262
 263 #ifdef ALTQ
 264         if (!ifq_is_enabled(_ifsq->ifsq_altq))
 265                 ifsq_classic_request(_ifsq, ALTRQ_PURGE, NULL);
 266         else
 267 #endif
 268         _ifsq->ifsq_request(_ifsq, ALTRQ_PURGE, NULL);
 269 }
 270
 271 static __inline void
 272 ifsq_purge(struct ifaltq_subque *_ifsq)
 273 {
 274         ALTQ_SQ_LOCK(_ifsq);
 275         ifsq_purge_locked(_ifsq);
 276         ALTQ_SQ_UNLOCK(_ifsq);
 277 }
 278
 279 static __inline void
 280 ifq_lock_all(struct ifaltq *_ifq)
 281 {
 282         int _q;
 283
 284         for (_q = 0; _q < _ifq->altq_subq_cnt; ++_q)
 285                 ALTQ_SQ_LOCK(&_ifq->altq_subq[_q]);
 286 }
 287
 288 static __inline void
 289 ifq_unlock_all(struct ifaltq *_ifq)
 290 {
 291         int _q;
 292
 293         for (_q = _ifq->altq_subq_cnt - 1; _q >= 0; --_q)
 294                 ALTQ_SQ_UNLOCK(&_ifq->altq_subq[_q]);
 295 }
 296
 297 /*
 298  * All of the subqueue locks must be held
 299  */
 300 static __inline void
 301 ifq_purge_all_locked(struct ifaltq *_ifq)
 302 {
 303         int _q;
 304
 305         for (_q = 0; _q < _ifq->altq_subq_cnt; ++_q)
 306                 ifsq_purge_locked(&_ifq->altq_subq[_q]);
 307 }
 308
 309 static __inline void
 310 ifq_purge_all(struct ifaltq *_ifq)
 311 {
 312         ifq_lock_all(_ifq);
 313         ifq_purge_all_locked(_ifq);
 314         ifq_unlock_all(_ifq);
 315 }
 316
 317 static __inline void
 318 ifq_classify(struct ifaltq *_ifq, struct mbuf *_m, uint8_t _af,
 319     struct altq_pktattr *_pa)
 320 {
 321 #ifdef ALTQ
 322         if (ifq_is_enabled(_ifq)) {
 323                 _pa->pattr_af = _af;
 324                 _pa->pattr_hdr = mtod(_m, caddr_t);
 325                 if (ifq_is_enabled(_ifq) &&
 326                     (_ifq->altq_flags & ALTQF_CLASSIFY)) {
 327                         /* XXX default subqueue */
 328                         struct ifaltq_subque *_ifsq =
 329                             &_ifq->altq_subq[ALTQ_SUBQ_INDEX_DEFAULT];
 330
 331                         ALTQ_SQ_LOCK(_ifsq);
 332                         if (ifq_is_enabled(_ifq) &&
 333                             (_ifq->altq_flags & ALTQF_CLASSIFY))
 334                                 _ifq->altq_classify(_ifq, _m, _pa);
 335                         ALTQ_SQ_UNLOCK(_ifsq);
 336                 }
 337         }
 338 #endif
 339 }
 340
 341 static __inline void
 342 ifsq_prepend(struct ifaltq_subque *_ifsq, struct mbuf *_m)
 343 {
 344         ALTQ_SQ_LOCK(_ifsq);
 345         KASSERT(_ifsq->ifsq_prepended == NULL, ("pending prepended mbuf"));
 346         _ifsq->ifsq_prepended = _m;
 347         ALTQ_SQ_CNTR_INC(_ifsq, _m->m_pkthdr.len);
 348         ALTQ_SQ_UNLOCK(_ifsq);
 349 }
 350
 351 /*
 352  * Subqueue hardware serializer must be held
 353  */
 354 static __inline void
 355 ifsq_set_oactive(struct ifaltq_subque *_ifsq)
 356 {
 357         _ifsq->ifsq_hw_oactive = 1;
 358 }
 359
 360 /*
 361  * Subqueue hardware serializer must be held
 362  */
 363 static __inline void
 364 ifsq_clr_oactive(struct ifaltq_subque *_ifsq)
 365 {
 366         _ifsq->ifsq_hw_oactive = 0;
 367 }
 368
 369 /*
 370  * Subqueue hardware serializer must be held
 371  */
 372 static __inline int
 373 ifsq_is_oactive(const struct ifaltq_subque *_ifsq)
 374 {
 375         return _ifsq->ifsq_hw_oactive;
 376 }
 377
 378 /*
 379  * Hand a packet to the interface's default subqueue.
 380  *
 381  * The default subqueue hardware serializer must be held.  If the
 382  * subqueue hardware serializer is not held yet, ifq_dispatch()
 383  * should be used to get better performance.
 384  */
 385 static __inline int
 386 ifq_handoff(struct ifnet *_ifp, struct mbuf *_m, struct altq_pktattr *_pa)
 387 {
 388         struct ifaltq_subque *_ifsq;
 389         int _error;
 390         int _qid = ALTQ_SUBQ_INDEX_DEFAULT; /* XXX default subqueue */
 391
 392         _ifsq = &_ifp->if_snd.altq_subq[_qid];
 393
 394         ASSERT_ALTQ_SQ_SERIALIZED_HW(_ifsq);
 395         _error = ifsq_enqueue(_ifsq, _m, _pa);
 396         if (_error == 0) {
 397                 IFNET_STAT_INC(_ifp, obytes, _m->m_pkthdr.len);
 398                 if (_m->m_flags & M_MCAST)
 399                         IFNET_STAT_INC(_ifp, omcasts, 1);
 400                 if (!ifsq_is_oactive(_ifsq))
 401                         (*_ifp->if_start)(_ifp, _ifsq);
 402         } else {
 403                 IFNET_STAT_INC(_ifp, oqdrops, 1);
 404         }
 405         return(_error);
 406 }
 407
 408 static __inline int
 409 ifsq_is_empty(const struct ifaltq_subque *_ifsq)
 410 {
 411         return(_ifsq->ifsq_len == 0);
 412 }
 413
 414 /*
 415  * Subqueue lock must be held
 416  */
 417 static __inline int
 418 ifsq_data_ready(struct ifaltq_subque *_ifsq)
 419 {
 420 #ifdef ALTQ
 421         if (_ifsq->ifsq_altq->altq_tbr != NULL)
 422                 return (ifsq_poll_locked(_ifsq) != NULL);
 423         else
 424 #endif
 425         return !ifsq_is_empty(_ifsq);
 426 }
 427
 428 /*
 429  * Subqueue lock must be held
 430  */
 431 static __inline int
 432 ifsq_is_started(const struct ifaltq_subque *_ifsq)
 433 {
 434         return _ifsq->ifsq_started;
 435 }
 436
 437 /*
 438  * Subqueue lock must be held
 439  */
 440 static __inline void
 441 ifsq_set_started(struct ifaltq_subque *_ifsq)
 442 {
 443         _ifsq->ifsq_started = 1;
 444 }
 445
 446 /*
 447  * Subqueue lock must be held
 448  */
 449 static __inline void
 450 ifsq_clr_started(struct ifaltq_subque *_ifsq)
 451 {
 452         _ifsq->ifsq_started = 0;
 453 }
 454
 455 static __inline struct ifsubq_stage *
 456 ifsq_get_stage(struct ifaltq_subque *_ifsq, int _cpuid)
 457 {
 458         return &_ifsq->ifsq_stage[_cpuid];
 459 }
 460
 461 static __inline int
 462 ifsq_get_cpuid(const struct ifaltq_subque *_ifsq)
 463 {
 464         return _ifsq->ifsq_cpuid;
 465 }
 466
 467 static __inline void
 468 ifsq_set_cpuid(struct ifaltq_subque *_ifsq, int _cpuid)
 469 {
 470         KASSERT(_cpuid >= 0 && _cpuid < ncpus,
 471             ("invalid ifsq_cpuid %d", _cpuid));
 472         _ifsq->ifsq_cpuid = _cpuid;
 473 }
 474
 475 static __inline struct lwkt_msg *
 476 ifsq_get_ifstart_lmsg(struct ifaltq_subque *_ifsq, int _cpuid)
 477 {
 478         return &_ifsq->ifsq_ifstart_nmsg[_cpuid].lmsg;
 479 }
 480
 481 static __inline int
 482 ifsq_get_index(const struct ifaltq_subque *_ifsq)
 483 {
 484         return _ifsq->ifsq_index;
 485 }
 486
 487 static __inline void
 488 ifsq_set_priv(struct ifaltq_subque *_ifsq, void *_priv)
 489 {
 490         _ifsq->ifsq_hw_priv = _priv;
 491 }
 492
 493 static __inline void *
 494 ifsq_get_priv(const struct ifaltq_subque *_ifsq)
 495 {
 496         return _ifsq->ifsq_hw_priv;
 497 }
 498
 499 static __inline struct ifnet *
 500 ifsq_get_ifp(const struct ifaltq_subque *_ifsq)
 501 {
 502         return _ifsq->ifsq_ifp;
 503 }
 504
 505 static __inline void
 506 ifsq_set_hw_serialize(struct ifaltq_subque *_ifsq,
 507     struct lwkt_serialize *_hwslz)
 508 {
 509         KASSERT(_hwslz != NULL, ("NULL hw serialize"));
 510         KASSERT(_ifsq->ifsq_hw_serialize == NULL,
 511             ("hw serialize has been setup"));
 512         _ifsq->ifsq_hw_serialize = _hwslz;
 513 }
 514
 515 static __inline void
 516 ifsq_serialize_hw(struct ifaltq_subque *_ifsq)
 517 {
 518         lwkt_serialize_enter(_ifsq->ifsq_hw_serialize);
 519 }
 520
 521 static __inline void
 522 ifsq_deserialize_hw(struct ifaltq_subque *_ifsq)
 523 {
 524         lwkt_serialize_exit(_ifsq->ifsq_hw_serialize);
 525 }
 526
 527 static __inline int
 528 ifsq_tryserialize_hw(struct ifaltq_subque *_ifsq)
 529 {
 530         return lwkt_serialize_try(_ifsq->ifsq_hw_serialize);
 531 }
 532
 533 static __inline struct ifaltq_subque *
 534 ifq_get_subq_default(const struct ifaltq *_ifq)
 535 {
 536         return &_ifq->altq_subq[ALTQ_SUBQ_INDEX_DEFAULT];
 537 }
 538
 539 static __inline struct ifaltq_subque *
 540 ifq_get_subq(const struct ifaltq *_ifq, int _idx)
 541 {
 542         KASSERT(_idx >= 0 && _idx < _ifq->altq_subq_cnt,
 543             ("invalid qid %d", _idx));
 544         return &_ifq->altq_subq[_idx];
 545 }
 546
 547 static __inline struct ifaltq_subque *
 548 ifq_map_subq(struct ifaltq *_ifq, int _cpuid)
 549 {
 550         int _idx = _ifq->altq_mapsubq(_ifq, _cpuid);
 551         return ifq_get_subq(_ifq, _idx);
 552 }
 553
 554 static __inline void
 555 ifq_set_subq_cnt(struct ifaltq *_ifq, int _cnt)
 556 {
 557         _ifq->altq_subq_cnt = _cnt;
 558 }
 559
 560 static __inline void
 561 ifq_set_subq_divisor(struct ifaltq *_ifq, uint32_t _divisor)
 562 {
 563
 564         KASSERT(_divisor > 0, ("invalid divisor %u", _divisor));
 565         KASSERT(_divisor <= _ifq->altq_subq_cnt,
 566             ("invalid divisor %u, max %d", _divisor, _ifq->altq_subq_cnt));
 567         _ifq->altq_subq_mappriv = _divisor;
 568 }
 569
 570 /* COMPAT */
 571 static __inline int
 572 ifq_is_oactive(const struct ifaltq *_ifq)
 573 {
 574         return ifsq_is_oactive(ifq_get_subq_default(_ifq));
 575 }
 576
 577 /* COMPAT */
 578 static __inline void
 579 ifq_set_oactive(struct ifaltq *_ifq)
 580 {
 581         ifsq_set_oactive(ifq_get_subq_default(_ifq));
 582 }
 583
 584 /* COMPAT */
 585 static __inline void
 586 ifq_clr_oactive(struct ifaltq *_ifq)
 587 {
 588         ifsq_clr_oactive(ifq_get_subq_default(_ifq));
 589 }
 590
 591 /* COMPAT */
 592 static __inline int
 593 ifq_is_empty(struct ifaltq *_ifq)
 594 {
 595         return ifsq_is_empty(ifq_get_subq_default(_ifq));
 596 }
 597
 598 /* COMPAT */
 599 static __inline void
 600 ifq_purge(struct ifaltq *_ifq)
 601 {
 602         ifsq_purge(ifq_get_subq_default(_ifq));
 603 }
 604
 605 /* COMPAT */
 606 static __inline struct mbuf *
 607 ifq_dequeue(struct ifaltq *_ifq)
 608 {
 609         return ifsq_dequeue(ifq_get_subq_default(_ifq));
 610 }
 611
 612 /* COMPAT */
 613 static __inline void
 614 ifq_prepend(struct ifaltq *_ifq, struct mbuf *_m)
 615 {
 616         ifsq_prepend(ifq_get_subq_default(_ifq), _m);
 617 }
 618
 619 /* COMPAT */
 620 static __inline void
 621 ifq_set_cpuid(struct ifaltq *_ifq, int _cpuid)
 622 {
 623         KASSERT(_ifq->altq_subq_cnt == 1,
 624             ("invalid subqueue count %d", _ifq->altq_subq_cnt));
 625         ifsq_set_cpuid(ifq_get_subq_default(_ifq), _cpuid);
 626 }
 627
 628 /* COMPAT */
 629 static __inline void
 630 ifq_set_hw_serialize(struct ifaltq *_ifq, struct lwkt_serialize *_hwslz)
 631 {
 632         KASSERT(_ifq->altq_subq_cnt == 1,
 633             ("invalid subqueue count %d", _ifq->altq_subq_cnt));
 634         ifsq_set_hw_serialize(ifq_get_subq_default(_ifq), _hwslz);
 635 }
 636
 637 #endif  /* _NET_IFQ_VAR_H_ */