altq_priq.c

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    1 /*-
    2  * Copyright (C) 2000-2003
    3  *      Sony Computer Science Laboratories Inc.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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 the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $KAME: altq_priq.c,v 1.11 2003/09/17 14:23:25 kjc Exp $
   27  * $FreeBSD$
   28  */
   29 /*
   30  * priority queue
   31  */
   32 
   33 #include "opt_altq.h"
   34 #include "opt_inet.h"
   35 #include "opt_inet6.h"
   36 
   37 #ifdef ALTQ_PRIQ  /* priq is enabled by ALTQ_PRIQ option in opt_altq.h */
   38 
   39 #include <sys/param.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/socket.h>
   43 #include <sys/sockio.h>
   44 #include <sys/systm.h>
   45 #include <sys/proc.h>
   46 #include <sys/errno.h>
   47 #include <sys/kernel.h>
   48 #include <sys/queue.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_var.h>
   52 #include <net/if_private.h>
   53 #include <netinet/in.h>
   54 
   55 #include <netpfil/pf/pf.h>
   56 #include <netpfil/pf/pf_altq.h>
   57 #include <netpfil/pf/pf_mtag.h>
   58 #include <net/altq/altq.h>
   59 #include <net/altq/altq_priq.h>
   60 
   61 /*
   62  * function prototypes
   63  */
   64 static int priq_clear_interface(struct priq_if *);
   65 static int priq_request(struct ifaltq *, int, void *);
   66 static void priq_purge(struct priq_if *);
   67 static struct priq_class *priq_class_create(struct priq_if *, int, int, int,
   68     int);
   69 static int priq_class_destroy(struct priq_class *);
   70 static int priq_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *);
   71 static struct mbuf *priq_dequeue(struct ifaltq *, int);
   72 
   73 static int priq_addq(struct priq_class *, struct mbuf *);
   74 static struct mbuf *priq_getq(struct priq_class *);
   75 static struct mbuf *priq_pollq(struct priq_class *);
   76 static void priq_purgeq(struct priq_class *);
   77 
   78 static void get_class_stats(struct priq_classstats *, struct priq_class *);
   79 static struct priq_class *clh_to_clp(struct priq_if *, u_int32_t);
   80 
   81 int
   82 priq_pfattach(struct pf_altq *a)
   83 {
   84         struct ifnet *ifp;
   85         int s, error;
   86 
   87         if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL)
   88                 return (EINVAL);
   89         s = splnet();
   90         error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, a->altq_disc,
   91             priq_enqueue, priq_dequeue, priq_request);
   92         splx(s);
   93         return (error);
   94 }
   95 
   96 int
   97 priq_add_altq(struct ifnet * ifp, struct pf_altq *a)
   98 {
   99         struct priq_if  *pif;
  100 
  101         if (ifp == NULL)
  102                 return (EINVAL);
  103         if (!ALTQ_IS_READY(&ifp->if_snd))
  104                 return (ENODEV);
  105 
  106         pif = malloc(sizeof(struct priq_if), M_DEVBUF, M_NOWAIT | M_ZERO);
  107         if (pif == NULL)
  108                 return (ENOMEM);
  109         pif->pif_bandwidth = a->ifbandwidth;
  110         pif->pif_maxpri = -1;
  111         pif->pif_ifq = &ifp->if_snd;
  112 
  113         /* keep the state in pf_altq */
  114         a->altq_disc = pif;
  115 
  116         return (0);
  117 }
  118 
  119 int
  120 priq_remove_altq(struct pf_altq *a)
  121 {
  122         struct priq_if *pif;
  123 
  124         if ((pif = a->altq_disc) == NULL)
  125                 return (EINVAL);
  126         a->altq_disc = NULL;
  127 
  128         (void)priq_clear_interface(pif);
  129 
  130         free(pif, M_DEVBUF);
  131         return (0);
  132 }
  133 
  134 int
  135 priq_add_queue(struct pf_altq *a)
  136 {
  137         struct priq_if *pif;
  138         struct priq_class *cl;
  139 
  140         if ((pif = a->altq_disc) == NULL)
  141                 return (EINVAL);
  142 
  143         /* check parameters */
  144         if (a->priority >= PRIQ_MAXPRI)
  145                 return (EINVAL);
  146         if (a->qid == 0)
  147                 return (EINVAL);
  148         if (pif->pif_classes[a->priority] != NULL)
  149                 return (EBUSY);
  150         if (clh_to_clp(pif, a->qid) != NULL)
  151                 return (EBUSY);
  152 
  153         cl = priq_class_create(pif, a->priority, a->qlimit,
  154             a->pq_u.priq_opts.flags, a->qid);
  155         if (cl == NULL)
  156                 return (ENOMEM);
  157 
  158         return (0);
  159 }
  160 
  161 int
  162 priq_remove_queue(struct pf_altq *a)
  163 {
  164         struct priq_if *pif;
  165         struct priq_class *cl;
  166 
  167         if ((pif = a->altq_disc) == NULL)
  168                 return (EINVAL);
  169 
  170         if ((cl = clh_to_clp(pif, a->qid)) == NULL)
  171                 return (EINVAL);
  172 
  173         return (priq_class_destroy(cl));
  174 }
  175 
  176 int
  177 priq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes, int version)
  178 {
  179         struct priq_if *pif;
  180         struct priq_class *cl;
  181         struct priq_classstats stats;
  182         int error = 0;
  183 
  184         if ((pif = altq_lookup(a->ifname, ALTQT_PRIQ)) == NULL)
  185                 return (EBADF);
  186 
  187         if ((cl = clh_to_clp(pif, a->qid)) == NULL)
  188                 return (EINVAL);
  189 
  190         if (*nbytes < sizeof(stats))
  191                 return (EINVAL);
  192 
  193         get_class_stats(&stats, cl);
  194 
  195         if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0)
  196                 return (error);
  197         *nbytes = sizeof(stats);
  198         return (0);
  199 }
  200 
  201 /*
  202  * bring the interface back to the initial state by discarding
  203  * all the filters and classes.
  204  */
  205 static int
  206 priq_clear_interface(struct priq_if *pif)
  207 {
  208         struct priq_class       *cl;
  209         int pri;
  210 
  211 #ifdef ALTQ3_CLFIER_COMPAT
  212         /* free the filters for this interface */
  213         acc_discard_filters(&pif->pif_classifier, NULL, 1);
  214 #endif
  215 
  216         /* clear out the classes */
  217         for (pri = 0; pri <= pif->pif_maxpri; pri++)
  218                 if ((cl = pif->pif_classes[pri]) != NULL)
  219                         priq_class_destroy(cl);
  220 
  221         return (0);
  222 }
  223 
  224 static int
  225 priq_request(struct ifaltq *ifq, int req, void *arg)
  226 {
  227         struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;
  228 
  229         IFQ_LOCK_ASSERT(ifq);
  230 
  231         switch (req) {
  232         case ALTRQ_PURGE:
  233                 priq_purge(pif);
  234                 break;
  235         }
  236         return (0);
  237 }
  238 
  239 /* discard all the queued packets on the interface */
  240 static void
  241 priq_purge(struct priq_if *pif)
  242 {
  243         struct priq_class *cl;
  244         int pri;
  245 
  246         for (pri = 0; pri <= pif->pif_maxpri; pri++) {
  247                 if ((cl = pif->pif_classes[pri]) != NULL && !qempty(cl->cl_q))
  248                         priq_purgeq(cl);
  249         }
  250         if (ALTQ_IS_ENABLED(pif->pif_ifq))
  251                 pif->pif_ifq->ifq_len = 0;
  252 }
  253 
  254 static struct priq_class *
  255 priq_class_create(struct priq_if *pif, int pri, int qlimit, int flags, int qid)
  256 {
  257         struct priq_class *cl;
  258         int s;
  259 
  260 #ifndef ALTQ_RED
  261         if (flags & PRCF_RED) {
  262 #ifdef ALTQ_DEBUG
  263                 printf("priq_class_create: RED not configured for PRIQ!\n");
  264 #endif
  265                 return (NULL);
  266         }
  267 #endif
  268 #ifndef ALTQ_CODEL
  269         if (flags & PRCF_CODEL) {
  270 #ifdef ALTQ_DEBUG
  271                 printf("priq_class_create: CODEL not configured for PRIQ!\n");
  272 #endif
  273                 return (NULL);
  274         }
  275 #endif
  276 
  277         if ((cl = pif->pif_classes[pri]) != NULL) {
  278                 /* modify the class instead of creating a new one */
  279                 s = splnet();
  280                 IFQ_LOCK(cl->cl_pif->pif_ifq);
  281                 if (!qempty(cl->cl_q))
  282                         priq_purgeq(cl);
  283                 IFQ_UNLOCK(cl->cl_pif->pif_ifq);
  284                 splx(s);
  285 #ifdef ALTQ_RIO
  286                 if (q_is_rio(cl->cl_q))
  287                         rio_destroy((rio_t *)cl->cl_red);
  288 #endif
  289 #ifdef ALTQ_RED
  290                 if (q_is_red(cl->cl_q))
  291                         red_destroy(cl->cl_red);
  292 #endif
  293 #ifdef ALTQ_CODEL
  294                 if (q_is_codel(cl->cl_q))
  295                         codel_destroy(cl->cl_codel);
  296 #endif
  297         } else {
  298                 cl = malloc(sizeof(struct priq_class), M_DEVBUF,
  299                     M_NOWAIT | M_ZERO);
  300                 if (cl == NULL)
  301                         return (NULL);
  302 
  303                 cl->cl_q = malloc(sizeof(class_queue_t), M_DEVBUF,
  304                     M_NOWAIT | M_ZERO);
  305                 if (cl->cl_q == NULL)
  306                         goto err_ret;
  307         }
  308 
  309         pif->pif_classes[pri] = cl;
  310         if (flags & PRCF_DEFAULTCLASS)
  311                 pif->pif_default = cl;
  312         if (qlimit == 0)
  313                 qlimit = 50;  /* use default */
  314         qlimit(cl->cl_q) = qlimit;
  315         qtype(cl->cl_q) = Q_DROPTAIL;
  316         qlen(cl->cl_q) = 0;
  317         qsize(cl->cl_q) = 0;
  318         cl->cl_flags = flags;
  319         cl->cl_pri = pri;
  320         if (pri > pif->pif_maxpri)
  321                 pif->pif_maxpri = pri;
  322         cl->cl_pif = pif;
  323         cl->cl_handle = qid;
  324 
  325 #ifdef ALTQ_RED
  326         if (flags & (PRCF_RED|PRCF_RIO)) {
  327                 int red_flags, red_pkttime;
  328 
  329                 red_flags = 0;
  330                 if (flags & PRCF_ECN)
  331                         red_flags |= REDF_ECN;
  332 #ifdef ALTQ_RIO
  333                 if (flags & PRCF_CLEARDSCP)
  334                         red_flags |= RIOF_CLEARDSCP;
  335 #endif
  336                 if (pif->pif_bandwidth < 8)
  337                         red_pkttime = 1000 * 1000 * 1000; /* 1 sec */
  338                 else
  339                         red_pkttime = (int64_t)pif->pif_ifq->altq_ifp->if_mtu
  340                           * 1000 * 1000 * 1000 / (pif->pif_bandwidth / 8);
  341 #ifdef ALTQ_RIO
  342                 if (flags & PRCF_RIO) {
  343                         cl->cl_red = (red_t *)rio_alloc(0, NULL,
  344                                                 red_flags, red_pkttime);
  345                         if (cl->cl_red == NULL)
  346                                 goto err_ret;
  347                         qtype(cl->cl_q) = Q_RIO;
  348                 } else
  349 #endif
  350                 if (flags & PRCF_RED) {
  351                         cl->cl_red = red_alloc(0, 0,
  352                             qlimit(cl->cl_q) * 10/100,
  353                             qlimit(cl->cl_q) * 30/100,
  354                             red_flags, red_pkttime);
  355                         if (cl->cl_red == NULL)
  356                                 goto err_ret;
  357                         qtype(cl->cl_q) = Q_RED;
  358                 }
  359         }
  360 #endif /* ALTQ_RED */
  361 #ifdef ALTQ_CODEL
  362         if (flags & PRCF_CODEL) {
  363                 cl->cl_codel = codel_alloc(5, 100, 0);
  364                 if (cl->cl_codel != NULL)
  365                         qtype(cl->cl_q) = Q_CODEL;
  366         }
  367 #endif
  368 
  369         return (cl);
  370 
  371  err_ret:
  372         if (cl->cl_red != NULL) {
  373 #ifdef ALTQ_RIO
  374                 if (q_is_rio(cl->cl_q))
  375                         rio_destroy((rio_t *)cl->cl_red);
  376 #endif
  377 #ifdef ALTQ_RED
  378                 if (q_is_red(cl->cl_q))
  379                         red_destroy(cl->cl_red);
  380 #endif
  381 #ifdef ALTQ_CODEL
  382                 if (q_is_codel(cl->cl_q))
  383                         codel_destroy(cl->cl_codel);
  384 #endif
  385         }
  386         if (cl->cl_q != NULL)
  387                 free(cl->cl_q, M_DEVBUF);
  388         free(cl, M_DEVBUF);
  389         return (NULL);
  390 }
  391 
  392 static int
  393 priq_class_destroy(struct priq_class *cl)
  394 {
  395         struct priq_if *pif;
  396         int s, pri;
  397 
  398         s = splnet();
  399         IFQ_LOCK(cl->cl_pif->pif_ifq);
  400 
  401 #ifdef ALTQ3_CLFIER_COMPAT
  402         /* delete filters referencing to this class */
  403         acc_discard_filters(&cl->cl_pif->pif_classifier, cl, 0);
  404 #endif
  405 
  406         if (!qempty(cl->cl_q))
  407                 priq_purgeq(cl);
  408 
  409         pif = cl->cl_pif;
  410         pif->pif_classes[cl->cl_pri] = NULL;
  411         if (pif->pif_maxpri == cl->cl_pri) {
  412                 for (pri = cl->cl_pri; pri >= 0; pri--)
  413                         if (pif->pif_classes[pri] != NULL) {
  414                                 pif->pif_maxpri = pri;
  415                                 break;
  416                         }
  417                 if (pri < 0)
  418                         pif->pif_maxpri = -1;
  419         }
  420         IFQ_UNLOCK(cl->cl_pif->pif_ifq);
  421         splx(s);
  422 
  423         if (cl->cl_red != NULL) {
  424 #ifdef ALTQ_RIO
  425                 if (q_is_rio(cl->cl_q))
  426                         rio_destroy((rio_t *)cl->cl_red);
  427 #endif
  428 #ifdef ALTQ_RED
  429                 if (q_is_red(cl->cl_q))
  430                         red_destroy(cl->cl_red);
  431 #endif
  432 #ifdef ALTQ_CODEL
  433                 if (q_is_codel(cl->cl_q))
  434                         codel_destroy(cl->cl_codel);
  435 #endif
  436         }
  437         free(cl->cl_q, M_DEVBUF);
  438         free(cl, M_DEVBUF);
  439         return (0);
  440 }
  441 
  442 /*
  443  * priq_enqueue is an enqueue function to be registered to
  444  * (*altq_enqueue) in struct ifaltq.
  445  */
  446 static int
  447 priq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr)
  448 {
  449         struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;
  450         struct priq_class *cl;
  451         struct pf_mtag *t;
  452         int len;
  453 
  454         IFQ_LOCK_ASSERT(ifq);
  455 
  456         /* grab class set by classifier */
  457         if ((m->m_flags & M_PKTHDR) == 0) {
  458                 /* should not happen */
  459                 printf("altq: packet for %s does not have pkthdr\n",
  460                     ifq->altq_ifp->if_xname);
  461                 m_freem(m);
  462                 return (ENOBUFS);
  463         }
  464         cl = NULL;
  465         if ((t = pf_find_mtag(m)) != NULL)
  466                 cl = clh_to_clp(pif, t->qid);
  467         if (cl == NULL) {
  468                 cl = pif->pif_default;
  469                 if (cl == NULL) {
  470                         m_freem(m);
  471                         return (ENOBUFS);
  472                 }
  473         }
  474         cl->cl_pktattr = NULL;
  475         len = m_pktlen(m);
  476         if (priq_addq(cl, m) != 0) {
  477                 /* drop occurred.  mbuf was freed in priq_addq. */
  478                 PKTCNTR_ADD(&cl->cl_dropcnt, len);
  479                 return (ENOBUFS);
  480         }
  481         IFQ_INC_LEN(ifq);
  482 
  483         /* successfully queued. */
  484         return (0);
  485 }
  486 
  487 /*
  488  * priq_dequeue is a dequeue function to be registered to
  489  * (*altq_dequeue) in struct ifaltq.
  490  *
  491  * note: ALTDQ_POLL returns the next packet without removing the packet
  492  *      from the queue.  ALTDQ_REMOVE is a normal dequeue operation.
  493  *      ALTDQ_REMOVE must return the same packet if called immediately
  494  *      after ALTDQ_POLL.
  495  */
  496 static struct mbuf *
  497 priq_dequeue(struct ifaltq *ifq, int op)
  498 {
  499         struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;
  500         struct priq_class *cl;
  501         struct mbuf *m;
  502         int pri;
  503 
  504         IFQ_LOCK_ASSERT(ifq);
  505 
  506         if (IFQ_IS_EMPTY(ifq))
  507                 /* no packet in the queue */
  508                 return (NULL);
  509 
  510         for (pri = pif->pif_maxpri;  pri >= 0; pri--) {
  511                 if ((cl = pif->pif_classes[pri]) != NULL &&
  512                     !qempty(cl->cl_q)) {
  513                         if (op == ALTDQ_POLL)
  514                                 return (priq_pollq(cl));
  515 
  516                         m = priq_getq(cl);
  517                         if (m != NULL) {
  518                                 IFQ_DEC_LEN(ifq);
  519                                 if (qempty(cl->cl_q))
  520                                         cl->cl_period++;
  521                                 PKTCNTR_ADD(&cl->cl_xmitcnt, m_pktlen(m));
  522                         }
  523                         return (m);
  524                 }
  525         }
  526         return (NULL);
  527 }
  528 
  529 static int
  530 priq_addq(struct priq_class *cl, struct mbuf *m)
  531 {
  532 
  533 #ifdef ALTQ_RIO
  534         if (q_is_rio(cl->cl_q))
  535                 return rio_addq((rio_t *)cl->cl_red, cl->cl_q, m,
  536                                 cl->cl_pktattr);
  537 #endif
  538 #ifdef ALTQ_RED
  539         if (q_is_red(cl->cl_q))
  540                 return red_addq(cl->cl_red, cl->cl_q, m, cl->cl_pktattr);
  541 #endif
  542 #ifdef ALTQ_CODEL
  543         if (q_is_codel(cl->cl_q))
  544                 return codel_addq(cl->cl_codel, cl->cl_q, m);
  545 #endif
  546         if (qlen(cl->cl_q) >= qlimit(cl->cl_q)) {
  547                 m_freem(m);
  548                 return (-1);
  549         }
  550 
  551         if (cl->cl_flags & PRCF_CLEARDSCP)
  552                 write_dsfield(m, cl->cl_pktattr, 0);
  553 
  554         _addq(cl->cl_q, m);
  555 
  556         return (0);
  557 }
  558 
  559 static struct mbuf *
  560 priq_getq(struct priq_class *cl)
  561 {
  562 #ifdef ALTQ_RIO
  563         if (q_is_rio(cl->cl_q))
  564                 return rio_getq((rio_t *)cl->cl_red, cl->cl_q);
  565 #endif
  566 #ifdef ALTQ_RED
  567         if (q_is_red(cl->cl_q))
  568                 return red_getq(cl->cl_red, cl->cl_q);
  569 #endif
  570 #ifdef ALTQ_CODEL
  571         if (q_is_codel(cl->cl_q))
  572                 return codel_getq(cl->cl_codel, cl->cl_q);
  573 #endif
  574         return _getq(cl->cl_q);
  575 }
  576 
  577 static struct mbuf *
  578 priq_pollq(cl)
  579         struct priq_class *cl;
  580 {
  581         return qhead(cl->cl_q);
  582 }
  583 
  584 static void
  585 priq_purgeq(struct priq_class *cl)
  586 {
  587         struct mbuf *m;
  588 
  589         if (qempty(cl->cl_q))
  590                 return;
  591 
  592         while ((m = _getq(cl->cl_q)) != NULL) {
  593                 PKTCNTR_ADD(&cl->cl_dropcnt, m_pktlen(m));
  594                 m_freem(m);
  595         }
  596         ASSERT(qlen(cl->cl_q) == 0);
  597 }
  598 
  599 static void
  600 get_class_stats(struct priq_classstats *sp, struct priq_class *cl)
  601 {
  602         sp->class_handle = cl->cl_handle;
  603         sp->qlength = qlen(cl->cl_q);
  604         sp->qlimit = qlimit(cl->cl_q);
  605         sp->period = cl->cl_period;
  606         sp->xmitcnt = cl->cl_xmitcnt;
  607         sp->dropcnt = cl->cl_dropcnt;
  608 
  609         sp->qtype = qtype(cl->cl_q);
  610 #ifdef ALTQ_RED
  611         if (q_is_red(cl->cl_q))
  612                 red_getstats(cl->cl_red, &sp->red[0]);
  613 #endif
  614 #ifdef ALTQ_RIO
  615         if (q_is_rio(cl->cl_q))
  616                 rio_getstats((rio_t *)cl->cl_red, &sp->red[0]);
  617 #endif
  618 #ifdef ALTQ_CODEL
  619         if (q_is_codel(cl->cl_q))
  620                 codel_getstats(cl->cl_codel, &sp->codel);
  621 #endif
  622 }
  623 
  624 /* convert a class handle to the corresponding class pointer */
  625 static struct priq_class *
  626 clh_to_clp(struct priq_if *pif, u_int32_t chandle)
  627 {
  628         struct priq_class *cl;
  629         int idx;
  630 
  631         if (chandle == 0)
  632                 return (NULL);
  633 
  634         for (idx = pif->pif_maxpri; idx >= 0; idx--)
  635                 if ((cl = pif->pif_classes[idx]) != NULL &&
  636                     cl->cl_handle == chandle)
  637                         return (cl);
  638 
  639         return (NULL);
  640 }
  641 
  642 #endif /* ALTQ_PRIQ */
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FreeBSD/Linux Kernel Cross Reference sys/net/altq/altq_priq.c

FreeBSD/Linux Kernel Cross Reference
sys/net/altq/altq_priq.c
