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