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