net/sched/sch_atm.c

   1 /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
   2
   3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
   4
   5
   6 #include <linux/config.h>
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/string.h>
  10 #include <linux/errno.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/atmdev.h>
  14 #include <linux/atmclip.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/file.h> /* for fput */
  18 #include <net/pkt_sched.h>
  19 #include <net/sock.h>
  20
  21
  22 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
  23
  24 #if 0 /* control */
  25 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  26 #else
  27 #define DPRINTK(format,args...)
  28 #endif
  29
  30 #if 0 /* data */
  31 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
  32 #else
  33 #define D2PRINTK(format,args...)
  34 #endif
  35
  36
  37 /*
  38  * The ATM queuing discipline provides a framework for invoking classifiers
  39  * (aka "filters"), which in turn select classes of this queuing discipline.
  40  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  41  * may share the same VC.
  42  *
  43  * When creating a class, VCs are specified by passing the number of the open
  44  * socket descriptor by which the calling process references the VC. The kernel
  45  * keeps the VC open at least until all classes using it are removed.
  46  *
  47  * In this file, most functions are named atm_tc_* to avoid confusion with all
  48  * the atm_* in net/atm. This naming convention differs from what's used in the
  49  * rest of net/sched.
  50  *
  51  * Known bugs:
  52  *  - sometimes messes up the IP stack
  53  *  - any manipulations besides the few operations described in the README, are
  54  *    untested and likely to crash the system
  55  *  - should lock the flow while there is data in the queue (?)
  56  */
  57
  58
  59 #define PRIV(sch) qdisc_priv(sch)
  60 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  61
  62
  63 struct atm_flow_data {
  64         struct Qdisc            *q;             /* FIFO, TBF, etc. */
  65         struct tcf_proto        *filter_list;
  66         struct atm_vcc          *vcc;           /* VCC; NULL if VCC is closed */
  67         void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
  68         struct atm_qdisc_data   *parent;        /* parent qdisc */
  69         struct socket           *sock;          /* for closing */
  70         u32                     classid;        /* x:y type ID */
  71         int                     ref;            /* reference count */
  72         struct gnet_stats_basic bstats;
  73         struct gnet_stats_queue qstats;
  74         spinlock_t              *stats_lock;
  75         struct atm_flow_data    *next;
  76         struct atm_flow_data    *excess;        /* flow for excess traffic;
  77                                                    NULL to set CLP instead */
  78         int                     hdr_len;
  79         unsigned char           hdr[0];         /* header data; MUST BE LAST */
  80 };
  81
  82 struct atm_qdisc_data {
  83         struct atm_flow_data    link;           /* unclassified skbs go here */
  84         struct atm_flow_data    *flows;         /* NB: "link" is also on this
  85                                                    list */
  86         struct tasklet_struct   task;           /* requeue tasklet */
  87 };
  88
  89
  90 /* ------------------------- Class/flow operations ------------------------- */
  91
  92
  93 static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
  94 {
  95         struct atm_flow_data *walk;
  96
  97         DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
  98         for (walk = qdisc->flows; walk; walk = walk->next)
  99                 if (walk == flow) return 1;
 100         DPRINTK("find_flow: not found\n");
 101         return 0;
 102 }
 103
 104
 105 static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
 106     u32 classid)
 107 {
 108         struct atm_qdisc_data *p = PRIV(sch);
 109         struct atm_flow_data *flow;
 110
 111         for (flow = p->flows; flow; flow = flow->next)
 112                 if (flow->classid == classid) break;
 113         return flow;
 114 }
 115
 116
 117 static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
 118     struct Qdisc *new,struct Qdisc **old)
 119 {
 120         struct atm_qdisc_data *p = PRIV(sch);
 121         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 122
 123         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
 124             p,flow,new,old);
 125         if (!find_flow(p,flow)) return -EINVAL;
 126         if (!new) new = &noop_qdisc;
 127         *old = xchg(&flow->q,new);
 128         if (*old) qdisc_reset(*old);
 129         return 0;
 130 }
 131
 132
 133 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
 134 {
 135         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 136
 137         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
 138         return flow ? flow->q : NULL;
 139 }
 140
 141
 142 static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
 143 {
 144         struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
 145         struct atm_flow_data *flow;
 146
 147         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
 148         flow = lookup_flow(sch,classid);
 149         if (flow) flow->ref++;
 150         DPRINTK("atm_tc_get: flow %p\n",flow);
 151         return (unsigned long) flow;
 152 }
 153
 154
 155 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 156     unsigned long parent, u32 classid)
 157 {
 158         return atm_tc_get(sch,classid);
 159 }
 160
 161
 162 static void destroy_filters(struct atm_flow_data *flow)
 163 {
 164         struct tcf_proto *filter;
 165
 166         while ((filter = flow->filter_list)) {
 167                 DPRINTK("destroy_filters: destroying filter %p\n",filter);
 168                 flow->filter_list = filter->next;
 169                 tcf_destroy(filter);
 170         }
 171 }
 172
 173
 174 /*
 175  * atm_tc_put handles all destructions, including the ones that are explicitly
 176  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 177  * anything that still seems to be in use.
 178  */
 179
 180 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 181 {
 182         struct atm_qdisc_data *p = PRIV(sch);
 183         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 184         struct atm_flow_data **prev;
 185
 186         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 187         if (--flow->ref) return;
 188         DPRINTK("atm_tc_put: destroying\n");
 189         for (prev = &p->flows; *prev; prev = &(*prev)->next)
 190                 if (*prev == flow) break;
 191         if (!*prev) {
 192                 printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
 193                 return;
 194         }
 195         *prev = flow->next;
 196         DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
 197         qdisc_destroy(flow->q);
 198         destroy_filters(flow);
 199         if (flow->sock) {
 200                 DPRINTK("atm_tc_put: f_count %d\n",
 201                     file_count(flow->sock->file));
 202                 flow->vcc->pop = flow->old_pop;
 203                 sockfd_put(flow->sock);
 204         }
 205         if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
 206         if (flow != &p->link) kfree(flow);
 207         /*
 208          * If flow == &p->link, the qdisc no longer works at this point and
 209          * needs to be removed. (By the caller of atm_tc_put.)
 210          */
 211 }
 212
 213
 214 static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
 215 {
 216         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 217
 218         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
 219         VCC2FLOW(vcc)->old_pop(vcc,skb);
 220         tasklet_schedule(&p->task);
 221 }
 222
 223 static const u8 llc_oui_ip[] = {
 224         0xaa,           /* DSAP: non-ISO */
 225         0xaa,           /* SSAP: non-ISO */
 226         0x03,           /* Ctrl: Unnumbered Information Command PDU */
 227         0x00,           /* OUI: EtherType */
 228         0x00, 0x00,
 229         0x08, 0x00 };   /* Ethertype IP (0800) */
 230
 231 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 232     struct rtattr **tca, unsigned long *arg)
 233 {
 234         struct atm_qdisc_data *p = PRIV(sch);
 235         struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
 236         struct atm_flow_data *excess = NULL;
 237         struct rtattr *opt = tca[TCA_OPTIONS-1];
 238         struct rtattr *tb[TCA_ATM_MAX];
 239         struct socket *sock;
 240         int fd,error,hdr_len;
 241         void *hdr;
 242
 243         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 244             "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
 245         /*
 246          * The concept of parents doesn't apply for this qdisc.
 247          */
 248         if (parent && parent != TC_H_ROOT && parent != sch->handle)
 249                 return -EINVAL;
 250         /*
 251          * ATM classes cannot be changed. In order to change properties of the
 252          * ATM connection, that socket needs to be modified directly (via the
 253          * native ATM API. In order to send a flow to a different VC, the old
 254          * class needs to be removed and a new one added. (This may be changed
 255          * later.)
 256          */
 257         if (flow) return -EBUSY;
 258         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
 259                 return -EINVAL;
 260         if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
 261                 return -EINVAL;
 262         fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
 263         DPRINTK("atm_tc_change: fd %d\n",fd);
 264         if (tb[TCA_ATM_HDR-1]) {
 265                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
 266                 hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
 267         }
 268         else {
 269                 hdr_len = RFC1483LLC_LEN;
 270                 hdr = NULL; /* default LLC/SNAP for IP */
 271         }
 272         if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
 273         else {
 274                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
 275                         return -EINVAL;
 276                 excess = (struct atm_flow_data *) atm_tc_get(sch,
 277                     *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
 278                 if (!excess) return -ENOENT;
 279         }
 280         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 281             opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
 282         if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
 283         DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
 284         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 285                 error = -EPROTOTYPE;
 286                 goto err_out;
 287         }
 288         /* @@@ should check if the socket is really operational or we'll crash
 289            on vcc->send */
 290         if (classid) {
 291                 if (TC_H_MAJ(classid ^ sch->handle)) {
 292                         DPRINTK("atm_tc_change: classid mismatch\n");
 293                         error = -EINVAL;
 294                         goto err_out;
 295                 }
 296                 if (find_flow(p,flow)) {
 297                         error = -EEXIST;
 298                         goto err_out;
 299                 }
 300         }
 301         else {
 302                 int i;
 303                 unsigned long cl;
 304
 305                 for (i = 1; i < 0x8000; i++) {
 306                         classid = TC_H_MAKE(sch->handle,0x8000 | i);
 307                         if (!(cl = atm_tc_get(sch,classid))) break;
 308                         atm_tc_put(sch,cl);
 309                 }
 310         }
 311         DPRINTK("atm_tc_change: new id %x\n",classid);
 312         flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
 313         DPRINTK("atm_tc_change: flow %p\n",flow);
 314         if (!flow) {
 315                 error = -ENOBUFS;
 316                 goto err_out;
 317         }
 318         memset(flow,0,sizeof(*flow));
 319         flow->filter_list = NULL;
 320         if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
 321                 flow->q = &noop_qdisc;
 322         DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
 323         flow->sock = sock;
 324         flow->vcc = ATM_SD(sock); /* speedup */
 325         flow->vcc->user_back = flow;
 326         DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
 327         flow->old_pop = flow->vcc->pop;
 328         flow->parent = p;
 329         flow->vcc->pop = sch_atm_pop;
 330         flow->classid = classid;
 331         flow->ref = 1;
 332         flow->excess = excess;
 333         flow->next = p->link.next;
 334         p->link.next = flow;
 335         flow->hdr_len = hdr_len;
 336         if (hdr)
 337                 memcpy(flow->hdr,hdr,hdr_len);
 338         else
 339                 memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip));
 340         *arg = (unsigned long) flow;
 341         return 0;
 342 err_out:
 343         if (excess) atm_tc_put(sch,(unsigned long) excess);
 344         sockfd_put(sock);
 345         return error;
 346 }
 347
 348
 349 static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
 350 {
 351         struct atm_qdisc_data *p = PRIV(sch);
 352         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 353
 354         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 355         if (!find_flow(PRIV(sch),flow)) return -EINVAL;
 356         if (flow->filter_list || flow == &p->link) return -EBUSY;
 357         /*
 358          * Reference count must be 2: one for "keepalive" (set at class
 359          * creation), and one for the reference held when calling delete.
 360          */
 361         if (flow->ref < 2) {
 362                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
 363                 return -EINVAL;
 364         }
 365         if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
 366         atm_tc_put(sch,arg);
 367         return 0;
 368 }
 369
 370
 371 static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
 372 {
 373         struct atm_qdisc_data *p = PRIV(sch);
 374         struct atm_flow_data *flow;
 375
 376         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
 377         if (walker->stop) return;
 378         for (flow = p->flows; flow; flow = flow->next) {
 379                 if (walker->count >= walker->skip)
 380                         if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
 381                                 walker->stop = 1;
 382                                 break;
 383                         }
 384                 walker->count++;
 385         }
 386 }
 387
 388
 389 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
 390 {
 391         struct atm_qdisc_data *p = PRIV(sch);
 392         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 393
 394         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 395         return flow ? &flow->filter_list : &p->link.filter_list;
 396 }
 397
 398
 399 /* --------------------------- Qdisc operations ---------------------------- */
 400
 401
 402 static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
 403 {
 404         struct atm_qdisc_data *p = PRIV(sch);
 405         struct atm_flow_data *flow = NULL ; /* @@@ */
 406         struct tcf_result res;
 407         int result;
 408         int ret = NET_XMIT_POLICED;
 409
 410         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
 411         result = TC_POLICE_OK; /* be nice to gcc */
 412         if (TC_H_MAJ(skb->priority) != sch->handle ||
 413             !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
 414                 for (flow = p->flows; flow; flow = flow->next)
 415                         if (flow->filter_list) {
 416                                 result = tc_classify(skb,flow->filter_list,
 417                                     &res);
 418                                 if (result < 0) continue;
 419                                 flow = (struct atm_flow_data *) res.class;
 420                                 if (!flow) flow = lookup_flow(sch,res.classid);
 421                                 break;
 422                         }
 423         if (!flow) flow = &p->link;
 424         else {
 425                 if (flow->vcc)
 426                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 427                         /*@@@ looks good ... but it's not supposed to work :-)*/
 428 #ifdef CONFIG_NET_CLS_POLICE
 429                 switch (result) {
 430                         case TC_POLICE_SHOT:
 431                                 kfree_skb(skb);
 432                                 break;
 433                         case TC_POLICE_RECLASSIFY:
 434                                 if (flow->excess) flow = flow->excess;
 435                                 else {
 436                                         ATM_SKB(skb)->atm_options |=
 437                                             ATM_ATMOPT_CLP;
 438                                         break;
 439                                 }
 440                                 /* fall through */
 441                         case TC_POLICE_OK:
 442                                 /* fall through */
 443                         default:
 444                                 break;
 445                 }
 446 #endif
 447         }
 448         if (
 449 #ifdef CONFIG_NET_CLS_POLICE
 450             result == TC_POLICE_SHOT ||
 451 #endif
 452             (ret = flow->q->enqueue(skb,flow->q)) != 0) {
 453                 sch->qstats.drops++;
 454                 if (flow) flow->qstats.drops++;
 455                 return ret;
 456         }
 457         sch->bstats.bytes += skb->len;
 458         sch->bstats.packets++;
 459         flow->bstats.bytes += skb->len;
 460         flow->bstats.packets++;
 461         /*
 462          * Okay, this may seem weird. We pretend we've dropped the packet if
 463          * it goes via ATM. The reason for this is that the outer qdisc
 464          * expects to be able to q->dequeue the packet later on if we return
 465          * success at this place. Also, sch->q.qdisc needs to reflect whether
 466          * there is a packet egligible for dequeuing or not. Note that the
 467          * statistics of the outer qdisc are necessarily wrong because of all
 468          * this. There's currently no correct solution for this.
 469          */
 470         if (flow == &p->link) {
 471                 sch->q.qlen++;
 472                 return 0;
 473         }
 474         tasklet_schedule(&p->task);
 475         return NET_XMIT_BYPASS;
 476 }
 477
 478
 479 /*
 480  * Dequeue packets and send them over ATM. Note that we quite deliberately
 481  * avoid checking net_device's flow control here, simply because sch_atm
 482  * uses its own channels, which have nothing to do with any CLIP/LANE/or
 483  * non-ATM interfaces.
 484  */
 485
 486
 487 static void sch_atm_dequeue(unsigned long data)
 488 {
 489         struct Qdisc *sch = (struct Qdisc *) data;
 490         struct atm_qdisc_data *p = PRIV(sch);
 491         struct atm_flow_data *flow;
 492         struct sk_buff *skb;
 493
 494         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
 495         for (flow = p->link.next; flow; flow = flow->next)
 496                 /*
 497                  * If traffic is properly shaped, this won't generate nasty
 498                  * little bursts. Otherwise, it may ... (but that's okay)
 499                  */
 500                 while ((skb = flow->q->dequeue(flow->q))) {
 501                         if (!atm_may_send(flow->vcc,skb->truesize)) {
 502                                 (void) flow->q->ops->requeue(skb,flow->q);
 503                                 break;
 504                         }
 505                         D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow);
 506                         /* remove any LL header somebody else has attached */
 507                         skb_pull(skb,(char *) skb->nh.iph-(char *) skb->data);
 508                         if (skb_headroom(skb) < flow->hdr_len) {
 509                                 struct sk_buff *new;
 510
 511                                 new = skb_realloc_headroom(skb,flow->hdr_len);
 512                                 dev_kfree_skb(skb);
 513                                 if (!new) continue;
 514                                 skb = new;
 515                         }
 516                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
 517                             skb->nh.iph,skb->data);
 518                         ATM_SKB(skb)->vcc = flow->vcc;
 519                         memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
 520                             flow->hdr_len);
 521                         atomic_add(skb->truesize,
 522                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 523                         /* atm.atm_options are already set by atm_tc_enqueue */
 524                         (void) flow->vcc->send(flow->vcc,skb);
 525                 }
 526 }
 527
 528
 529 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 530 {
 531         struct atm_qdisc_data *p = PRIV(sch);
 532         struct sk_buff *skb;
 533
 534         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
 535         tasklet_schedule(&p->task);
 536         skb = p->link.q->dequeue(p->link.q);
 537         if (skb) sch->q.qlen--;
 538         return skb;
 539 }
 540
 541
 542 static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
 543 {
 544         struct atm_qdisc_data *p = PRIV(sch);
 545         int ret;
 546
 547         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
 548         ret = p->link.q->ops->requeue(skb,p->link.q);
 549         if (!ret) {
 550         sch->q.qlen++;
 551         sch->qstats.requeues++;
 552     } else {
 553                 sch->qstats.drops++;
 554                 p->link.qstats.drops++;
 555         }
 556         return ret;
 557 }
 558
 559
 560 static unsigned int atm_tc_drop(struct Qdisc *sch)
 561 {
 562         struct atm_qdisc_data *p = PRIV(sch);
 563         struct atm_flow_data *flow;
 564         unsigned int len;
 565
 566         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
 567         for (flow = p->flows; flow; flow = flow->next)
 568                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 569                         return len;
 570         return 0;
 571 }
 572
 573
 574 static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
 575 {
 576         struct atm_qdisc_data *p = PRIV(sch);
 577
 578         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
 579         p->flows = &p->link;
 580         if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
 581                 p->link.q = &noop_qdisc;
 582         DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
 583         p->link.filter_list = NULL;
 584         p->link.vcc = NULL;
 585         p->link.sock = NULL;
 586         p->link.classid = sch->handle;
 587         p->link.ref = 1;
 588         p->link.next = NULL;
 589         tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
 590         return 0;
 591 }
 592
 593
 594 static void atm_tc_reset(struct Qdisc *sch)
 595 {
 596         struct atm_qdisc_data *p = PRIV(sch);
 597         struct atm_flow_data *flow;
 598
 599         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
 600         for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
 601         sch->q.qlen = 0;
 602 }
 603
 604
 605 static void atm_tc_destroy(struct Qdisc *sch)
 606 {
 607         struct atm_qdisc_data *p = PRIV(sch);
 608         struct atm_flow_data *flow;
 609
 610         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
 611         /* races ? */
 612         while ((flow = p->flows)) {
 613                 destroy_filters(flow);
 614                 if (flow->ref > 1)
 615                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
 616                             flow->ref);
 617                 atm_tc_put(sch,(unsigned long) flow);
 618                 if (p->flows == flow) {
 619                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
 620                             "kill it\n",flow);
 621                         p->flows = flow->next; /* brute force */
 622                         break;
 623                 }
 624         }
 625         tasklet_kill(&p->task);
 626 }
 627
 628
 629 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 630     struct sk_buff *skb, struct tcmsg *tcm)
 631 {
 632         struct atm_qdisc_data *p = PRIV(sch);
 633         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 634         unsigned char *b = skb->tail;
 635         struct rtattr *rta;
 636
 637         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 638             sch,p,flow,skb,tcm);
 639         if (!find_flow(p,flow)) return -EINVAL;
 640         tcm->tcm_handle = flow->classid;
 641         rta = (struct rtattr *) b;
 642         RTA_PUT(skb,TCA_OPTIONS,0,NULL);
 643         RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
 644         if (flow->vcc) {
 645                 struct sockaddr_atmpvc pvc;
 646                 int state;
 647
 648                 pvc.sap_family = AF_ATMPVC;
 649                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 650                 pvc.sap_addr.vpi = flow->vcc->vpi;
 651                 pvc.sap_addr.vci = flow->vcc->vci;
 652                 RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
 653                 state = ATM_VF2VS(flow->vcc->flags);
 654                 RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
 655         }
 656         if (flow->excess)
 657                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
 658         else {
 659                 static u32 zero;
 660
 661                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
 662         }
 663         rta->rta_len = skb->tail-b;
 664         return skb->len;
 665
 666 rtattr_failure:
 667         skb_trim(skb,b-skb->data);
 668         return -1;
 669 }
 670 static int
 671 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 672         struct gnet_dump *d)
 673 {
 674         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 675
 676         flow->qstats.qlen = flow->q->q.qlen;
 677
 678         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 679             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 680                 return -1;
 681
 682         return 0;
 683 }
 684
 685 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 686 {
 687         return 0;
 688 }
 689
 690 static struct Qdisc_class_ops atm_class_ops = {
 691         .graft          =       atm_tc_graft,
 692         .leaf           =       atm_tc_leaf,
 693         .get            =       atm_tc_get,
 694         .put            =       atm_tc_put,
 695         .change         =       atm_tc_change,
 696         .delete         =       atm_tc_delete,
 697         .walk           =       atm_tc_walk,
 698         .tcf_chain      =       atm_tc_find_tcf,
 699         .bind_tcf       =       atm_tc_bind_filter,
 700         .unbind_tcf     =       atm_tc_put,
 701         .dump           =       atm_tc_dump_class,
 702         .dump_stats     =       atm_tc_dump_class_stats,
 703 };
 704
 705 static struct Qdisc_ops atm_qdisc_ops = {
 706         .next           =       NULL,
 707         .cl_ops         =       &atm_class_ops,
 708         .id             =       "atm",
 709         .priv_size      =       sizeof(struct atm_qdisc_data),
 710         .enqueue        =       atm_tc_enqueue,
 711         .dequeue        =       atm_tc_dequeue,
 712         .requeue        =       atm_tc_requeue,
 713         .drop           =       atm_tc_drop,
 714         .init           =       atm_tc_init,
 715         .reset          =       atm_tc_reset,
 716         .destroy        =       atm_tc_destroy,
 717         .change         =       NULL,
 718         .dump           =       atm_tc_dump,
 719         .owner          =       THIS_MODULE,
 720 };
 721
 722
 723 static int __init atm_init(void)
 724 {
 725         return register_qdisc(&atm_qdisc_ops);
 726 }
 727
 728 static void __exit atm_exit(void)
 729 {
 730         unregister_qdisc(&atm_qdisc_ops);
 731 }
 732
 733 module_init(atm_init)
 734 module_exit(atm_exit)
 735 MODULE_LICENSE("GPL");