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 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/string.h>
   8 #include <linux/errno.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/atmdev.h>
  11 #include <linux/atmclip.h>
  12 #include <linux/rtnetlink.h>
  13 #include <linux/file.h>         /* for fput */
  14 #include <net/netlink.h>
  15 #include <net/pkt_sched.h>
  16
  17 extern struct socket *sockfd_lookup(int fd, int *err);  /* @@@ fix this */
  18
  19 /*
  20  * The ATM queuing discipline provides a framework for invoking classifiers
  21  * (aka "filters"), which in turn select classes of this queuing discipline.
  22  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  23  * may share the same VC.
  24  *
  25  * When creating a class, VCs are specified by passing the number of the open
  26  * socket descriptor by which the calling process references the VC. The kernel
  27  * keeps the VC open at least until all classes using it are removed.
  28  *
  29  * In this file, most functions are named atm_tc_* to avoid confusion with all
  30  * the atm_* in net/atm. This naming convention differs from what's used in the
  31  * rest of net/sched.
  32  *
  33  * Known bugs:
  34  *  - sometimes messes up the IP stack
  35  *  - any manipulations besides the few operations described in the README, are
  36  *    untested and likely to crash the system
  37  *  - should lock the flow while there is data in the queue (?)
  38  */
  39
  40 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  41
  42 struct atm_flow_data {
  43         struct Qdisc            *q;     /* FIFO, TBF, etc. */
  44         struct tcf_proto        *filter_list;
  45         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
  46         void                    (*old_pop)(struct atm_vcc *vcc,
  47                                            struct sk_buff *skb); /* chaining */
  48         struct atm_qdisc_data   *parent;        /* parent qdisc */
  49         struct socket           *sock;          /* for closing */
  50         u32                     classid;        /* x:y type ID */
  51         int                     ref;            /* reference count */
  52         struct gnet_stats_basic bstats;
  53         struct gnet_stats_queue qstats;
  54         struct atm_flow_data    *next;
  55         struct atm_flow_data    *excess;        /* flow for excess traffic;
  56                                                    NULL to set CLP instead */
  57         int                     hdr_len;
  58         unsigned char           hdr[0];         /* header data; MUST BE LAST */
  59 };
  60
  61 struct atm_qdisc_data {
  62         struct atm_flow_data    link;           /* unclassified skbs go here */
  63         struct atm_flow_data    *flows;         /* NB: "link" is also on this
  64                                                    list */
  65         struct tasklet_struct   task;           /* requeue tasklet */
  66 };
  67
  68 /* ------------------------- Class/flow operations ------------------------- */
  69
  70 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
  71 {
  72         struct atm_flow_data *walk;
  73
  74         pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
  75         for (walk = qdisc->flows; walk; walk = walk->next)
  76                 if (walk == flow)
  77                         return 1;
  78         pr_debug("find_flow: not found\n");
  79         return 0;
  80 }
  81
  82 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
  83 {
  84         struct atm_qdisc_data *p = qdisc_priv(sch);
  85         struct atm_flow_data *flow;
  86
  87         for (flow = p->flows; flow; flow = flow->next)
  88                 if (flow->classid == classid)
  89                         break;
  90         return flow;
  91 }
  92
  93 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
  94                         struct Qdisc *new, struct Qdisc **old)
  95 {
  96         struct atm_qdisc_data *p = qdisc_priv(sch);
  97         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
  98
  99         pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
 100                 sch, p, flow, new, old);
 101         if (!find_flow(p, flow))
 102                 return -EINVAL;
 103         if (!new)
 104                 new = &noop_qdisc;
 105         *old = xchg(&flow->q, new);
 106         if (*old)
 107                 qdisc_reset(*old);
 108         return 0;
 109 }
 110
 111 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
 112 {
 113         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 114
 115         pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
 116         return flow ? flow->q : NULL;
 117 }
 118
 119 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
 120 {
 121         struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
 122         struct atm_flow_data *flow;
 123
 124         pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
 125         flow = lookup_flow(sch, classid);
 126         if (flow)
 127                 flow->ref++;
 128         pr_debug("atm_tc_get: flow %p\n", flow);
 129         return (unsigned long)flow;
 130 }
 131
 132 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 133                                         unsigned long parent, u32 classid)
 134 {
 135         return atm_tc_get(sch, classid);
 136 }
 137
 138 /*
 139  * atm_tc_put handles all destructions, including the ones that are explicitly
 140  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 141  * anything that still seems to be in use.
 142  */
 143 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 144 {
 145         struct atm_qdisc_data *p = qdisc_priv(sch);
 146         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 147         struct atm_flow_data **prev;
 148
 149         pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 150         if (--flow->ref)
 151                 return;
 152         pr_debug("atm_tc_put: destroying\n");
 153         for (prev = &p->flows; *prev; prev = &(*prev)->next)
 154                 if (*prev == flow)
 155                         break;
 156         if (!*prev) {
 157                 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
 158                 return;
 159         }
 160         *prev = flow->next;
 161         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
 162         qdisc_destroy(flow->q);
 163         tcf_destroy_chain(flow->filter_list);
 164         if (flow->sock) {
 165                 pr_debug("atm_tc_put: f_count %d\n",
 166                         file_count(flow->sock->file));
 167                 flow->vcc->pop = flow->old_pop;
 168                 sockfd_put(flow->sock);
 169         }
 170         if (flow->excess)
 171                 atm_tc_put(sch, (unsigned long)flow->excess);
 172         if (flow != &p->link)
 173                 kfree(flow);
 174         /*
 175          * If flow == &p->link, the qdisc no longer works at this point and
 176          * needs to be removed. (By the caller of atm_tc_put.)
 177          */
 178 }
 179
 180 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 181 {
 182         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 183
 184         pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
 185         VCC2FLOW(vcc)->old_pop(vcc, skb);
 186         tasklet_schedule(&p->task);
 187 }
 188
 189 static const u8 llc_oui_ip[] = {
 190         0xaa,                   /* DSAP: non-ISO */
 191         0xaa,                   /* SSAP: non-ISO */
 192         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
 193         0x00,                   /* OUI: EtherType */
 194         0x00, 0x00,
 195         0x08, 0x00
 196 };                              /* Ethertype IP (0800) */
 197
 198 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 199                          struct nlattr **tca, unsigned long *arg)
 200 {
 201         struct atm_qdisc_data *p = qdisc_priv(sch);
 202         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
 203         struct atm_flow_data *excess = NULL;
 204         struct nlattr *opt = tca[TCA_OPTIONS];
 205         struct nlattr *tb[TCA_ATM_MAX + 1];
 206         struct socket *sock;
 207         int fd, error, hdr_len;
 208         void *hdr;
 209
 210         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 211                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
 212         /*
 213          * The concept of parents doesn't apply for this qdisc.
 214          */
 215         if (parent && parent != TC_H_ROOT && parent != sch->handle)
 216                 return -EINVAL;
 217         /*
 218          * ATM classes cannot be changed. In order to change properties of the
 219          * ATM connection, that socket needs to be modified directly (via the
 220          * native ATM API. In order to send a flow to a different VC, the old
 221          * class needs to be removed and a new one added. (This may be changed
 222          * later.)
 223          */
 224         if (flow)
 225                 return -EBUSY;
 226         if (opt == NULL)
 227                 return -EINVAL;
 228         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, NULL);
 229         if (error < 0)
 230                 return error;
 231
 232         if (!tb[TCA_ATM_FD] || nla_len(tb[TCA_ATM_FD]) < sizeof(fd))
 233                 return -EINVAL;
 234         fd = *(int *)nla_data(tb[TCA_ATM_FD]);
 235         pr_debug("atm_tc_change: fd %d\n", fd);
 236         if (tb[TCA_ATM_HDR]) {
 237                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
 238                 hdr = nla_data(tb[TCA_ATM_HDR]);
 239         } else {
 240                 hdr_len = RFC1483LLC_LEN;
 241                 hdr = NULL;     /* default LLC/SNAP for IP */
 242         }
 243         if (!tb[TCA_ATM_EXCESS])
 244                 excess = NULL;
 245         else {
 246                 if (nla_len(tb[TCA_ATM_EXCESS]) != sizeof(u32))
 247                         return -EINVAL;
 248                 excess = (struct atm_flow_data *)
 249                         atm_tc_get(sch, *(u32 *)nla_data(tb[TCA_ATM_EXCESS]));
 250                 if (!excess)
 251                         return -ENOENT;
 252         }
 253         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 254                  opt->nla_type, nla_len(opt), hdr_len);
 255         sock = sockfd_lookup(fd, &error);
 256         if (!sock)
 257                 return error;   /* f_count++ */
 258         pr_debug("atm_tc_change: f_count %d\n", file_count(sock->file));
 259         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 260                 error = -EPROTOTYPE;
 261                 goto err_out;
 262         }
 263         /* @@@ should check if the socket is really operational or we'll crash
 264            on vcc->send */
 265         if (classid) {
 266                 if (TC_H_MAJ(classid ^ sch->handle)) {
 267                         pr_debug("atm_tc_change: classid mismatch\n");
 268                         error = -EINVAL;
 269                         goto err_out;
 270                 }
 271                 if (find_flow(p, flow)) {
 272                         error = -EEXIST;
 273                         goto err_out;
 274                 }
 275         } else {
 276                 int i;
 277                 unsigned long cl;
 278
 279                 for (i = 1; i < 0x8000; i++) {
 280                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
 281                         cl = atm_tc_get(sch, classid);
 282                         if (!cl)
 283                                 break;
 284                         atm_tc_put(sch, cl);
 285                 }
 286         }
 287         pr_debug("atm_tc_change: new id %x\n", classid);
 288         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
 289         pr_debug("atm_tc_change: flow %p\n", flow);
 290         if (!flow) {
 291                 error = -ENOBUFS;
 292                 goto err_out;
 293         }
 294         flow->filter_list = NULL;
 295         flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid);
 296         if (!flow->q)
 297                 flow->q = &noop_qdisc;
 298         pr_debug("atm_tc_change: qdisc %p\n", flow->q);
 299         flow->sock = sock;
 300         flow->vcc = ATM_SD(sock);       /* speedup */
 301         flow->vcc->user_back = flow;
 302         pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
 303         flow->old_pop = flow->vcc->pop;
 304         flow->parent = p;
 305         flow->vcc->pop = sch_atm_pop;
 306         flow->classid = classid;
 307         flow->ref = 1;
 308         flow->excess = excess;
 309         flow->next = p->link.next;
 310         p->link.next = flow;
 311         flow->hdr_len = hdr_len;
 312         if (hdr)
 313                 memcpy(flow->hdr, hdr, hdr_len);
 314         else
 315                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
 316         *arg = (unsigned long)flow;
 317         return 0;
 318 err_out:
 319         if (excess)
 320                 atm_tc_put(sch, (unsigned long)excess);
 321         sockfd_put(sock);
 322         return error;
 323 }
 324
 325 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
 326 {
 327         struct atm_qdisc_data *p = qdisc_priv(sch);
 328         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 329
 330         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 331         if (!find_flow(qdisc_priv(sch), flow))
 332                 return -EINVAL;
 333         if (flow->filter_list || flow == &p->link)
 334                 return -EBUSY;
 335         /*
 336          * Reference count must be 2: one for "keepalive" (set at class
 337          * creation), and one for the reference held when calling delete.
 338          */
 339         if (flow->ref < 2) {
 340                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
 341                 return -EINVAL;
 342         }
 343         if (flow->ref > 2)
 344                 return -EBUSY;  /* catch references via excess, etc. */
 345         atm_tc_put(sch, arg);
 346         return 0;
 347 }
 348
 349 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 350 {
 351         struct atm_qdisc_data *p = qdisc_priv(sch);
 352         struct atm_flow_data *flow;
 353
 354         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
 355         if (walker->stop)
 356                 return;
 357         for (flow = p->flows; flow; flow = flow->next) {
 358                 if (walker->count >= walker->skip)
 359                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
 360                                 walker->stop = 1;
 361                                 break;
 362                         }
 363                 walker->count++;
 364         }
 365 }
 366
 367 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
 368 {
 369         struct atm_qdisc_data *p = qdisc_priv(sch);
 370         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 371
 372         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 373         return flow ? &flow->filter_list : &p->link.filter_list;
 374 }
 375
 376 /* --------------------------- Qdisc operations ---------------------------- */
 377
 378 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 379 {
 380         struct atm_qdisc_data *p = qdisc_priv(sch);
 381         struct atm_flow_data *flow = NULL;      /* @@@ */
 382         struct tcf_result res;
 383         int result;
 384         int ret = NET_XMIT_POLICED;
 385
 386         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 387         result = TC_POLICE_OK;  /* be nice to gcc */
 388         if (TC_H_MAJ(skb->priority) != sch->handle ||
 389             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
 390                 for (flow = p->flows; flow; flow = flow->next)
 391                         if (flow->filter_list) {
 392                                 result = tc_classify_compat(skb,
 393                                                             flow->filter_list,
 394                                                             &res);
 395                                 if (result < 0)
 396                                         continue;
 397                                 flow = (struct atm_flow_data *)res.class;
 398                                 if (!flow)
 399                                         flow = lookup_flow(sch, res.classid);
 400                                 break;
 401                         }
 402         if (!flow)
 403                 flow = &p->link;
 404         else {
 405                 if (flow->vcc)
 406                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 407                 /*@@@ looks good ... but it's not supposed to work :-) */
 408 #ifdef CONFIG_NET_CLS_ACT
 409                 switch (result) {
 410                 case TC_ACT_QUEUED:
 411                 case TC_ACT_STOLEN:
 412                         kfree_skb(skb);
 413                         return NET_XMIT_SUCCESS;
 414                 case TC_ACT_SHOT:
 415                         kfree_skb(skb);
 416                         goto drop;
 417                 case TC_POLICE_RECLASSIFY:
 418                         if (flow->excess)
 419                                 flow = flow->excess;
 420                         else
 421                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
 422                         break;
 423                 }
 424 #endif
 425         }
 426
 427         ret = flow->q->enqueue(skb, flow->q);
 428         if (ret != 0) {
 429 drop: __maybe_unused
 430                 sch->qstats.drops++;
 431                 if (flow)
 432                         flow->qstats.drops++;
 433                 return ret;
 434         }
 435         sch->bstats.bytes += skb->len;
 436         sch->bstats.packets++;
 437         flow->bstats.bytes += skb->len;
 438         flow->bstats.packets++;
 439         /*
 440          * Okay, this may seem weird. We pretend we've dropped the packet if
 441          * it goes via ATM. The reason for this is that the outer qdisc
 442          * expects to be able to q->dequeue the packet later on if we return
 443          * success at this place. Also, sch->q.qdisc needs to reflect whether
 444          * there is a packet egligible for dequeuing or not. Note that the
 445          * statistics of the outer qdisc are necessarily wrong because of all
 446          * this. There's currently no correct solution for this.
 447          */
 448         if (flow == &p->link) {
 449                 sch->q.qlen++;
 450                 return 0;
 451         }
 452         tasklet_schedule(&p->task);
 453         return NET_XMIT_BYPASS;
 454 }
 455
 456 /*
 457  * Dequeue packets and send them over ATM. Note that we quite deliberately
 458  * avoid checking net_device's flow control here, simply because sch_atm
 459  * uses its own channels, which have nothing to do with any CLIP/LANE/or
 460  * non-ATM interfaces.
 461  */
 462
 463 static void sch_atm_dequeue(unsigned long data)
 464 {
 465         struct Qdisc *sch = (struct Qdisc *)data;
 466         struct atm_qdisc_data *p = qdisc_priv(sch);
 467         struct atm_flow_data *flow;
 468         struct sk_buff *skb;
 469
 470         pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
 471         for (flow = p->link.next; flow; flow = flow->next)
 472                 /*
 473                  * If traffic is properly shaped, this won't generate nasty
 474                  * little bursts. Otherwise, it may ... (but that's okay)
 475                  */
 476                 while ((skb = flow->q->dequeue(flow->q))) {
 477                         if (!atm_may_send(flow->vcc, skb->truesize)) {
 478                                 (void)flow->q->ops->requeue(skb, flow->q);
 479                                 break;
 480                         }
 481                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 482                         /* remove any LL header somebody else has attached */
 483                         skb_pull(skb, skb_network_offset(skb));
 484                         if (skb_headroom(skb) < flow->hdr_len) {
 485                                 struct sk_buff *new;
 486
 487                                 new = skb_realloc_headroom(skb, flow->hdr_len);
 488                                 dev_kfree_skb(skb);
 489                                 if (!new)
 490                                         continue;
 491                                 skb = new;
 492                         }
 493                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
 494                                  skb_network_header(skb), skb->data);
 495                         ATM_SKB(skb)->vcc = flow->vcc;
 496                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 497                                flow->hdr_len);
 498                         atomic_add(skb->truesize,
 499                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 500                         /* atm.atm_options are already set by atm_tc_enqueue */
 501                         flow->vcc->send(flow->vcc, skb);
 502                 }
 503 }
 504
 505 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 506 {
 507         struct atm_qdisc_data *p = qdisc_priv(sch);
 508         struct sk_buff *skb;
 509
 510         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 511         tasklet_schedule(&p->task);
 512         skb = p->link.q->dequeue(p->link.q);
 513         if (skb)
 514                 sch->q.qlen--;
 515         return skb;
 516 }
 517
 518 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 519 {
 520         struct atm_qdisc_data *p = qdisc_priv(sch);
 521         int ret;
 522
 523         pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 524         ret = p->link.q->ops->requeue(skb, p->link.q);
 525         if (!ret) {
 526                 sch->q.qlen++;
 527                 sch->qstats.requeues++;
 528         } else {
 529                 sch->qstats.drops++;
 530                 p->link.qstats.drops++;
 531         }
 532         return ret;
 533 }
 534
 535 static unsigned int atm_tc_drop(struct Qdisc *sch)
 536 {
 537         struct atm_qdisc_data *p = qdisc_priv(sch);
 538         struct atm_flow_data *flow;
 539         unsigned int len;
 540
 541         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
 542         for (flow = p->flows; flow; flow = flow->next)
 543                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 544                         return len;
 545         return 0;
 546 }
 547
 548 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 549 {
 550         struct atm_qdisc_data *p = qdisc_priv(sch);
 551
 552         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 553         p->flows = &p->link;
 554         p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
 555         if (!p->link.q)
 556                 p->link.q = &noop_qdisc;
 557         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 558         p->link.filter_list = NULL;
 559         p->link.vcc = NULL;
 560         p->link.sock = NULL;
 561         p->link.classid = sch->handle;
 562         p->link.ref = 1;
 563         p->link.next = NULL;
 564         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
 565         return 0;
 566 }
 567
 568 static void atm_tc_reset(struct Qdisc *sch)
 569 {
 570         struct atm_qdisc_data *p = qdisc_priv(sch);
 571         struct atm_flow_data *flow;
 572
 573         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 574         for (flow = p->flows; flow; flow = flow->next)
 575                 qdisc_reset(flow->q);
 576         sch->q.qlen = 0;
 577 }
 578
 579 static void atm_tc_destroy(struct Qdisc *sch)
 580 {
 581         struct atm_qdisc_data *p = qdisc_priv(sch);
 582         struct atm_flow_data *flow;
 583
 584         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 585         /* races ? */
 586         while ((flow = p->flows)) {
 587                 tcf_destroy_chain(flow->filter_list);
 588                 flow->filter_list = NULL;
 589                 if (flow->ref > 1)
 590                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
 591                                flow->ref);
 592                 atm_tc_put(sch, (unsigned long)flow);
 593                 if (p->flows == flow) {
 594                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
 595                                "kill it\n", flow);
 596                         p->flows = flow->next;  /* brute force */
 597                         break;
 598                 }
 599         }
 600         tasklet_kill(&p->task);
 601 }
 602
 603 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 604                              struct sk_buff *skb, struct tcmsg *tcm)
 605 {
 606         struct atm_qdisc_data *p = qdisc_priv(sch);
 607         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 608         struct nlattr *nest;
 609
 610         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 611                 sch, p, flow, skb, tcm);
 612         if (!find_flow(p, flow))
 613                 return -EINVAL;
 614         tcm->tcm_handle = flow->classid;
 615         tcm->tcm_info = flow->q->handle;
 616
 617         nest = nla_nest_start(skb, TCA_OPTIONS);
 618         if (nest == NULL)
 619                 goto nla_put_failure;
 620
 621         NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
 622         if (flow->vcc) {
 623                 struct sockaddr_atmpvc pvc;
 624                 int state;
 625
 626                 pvc.sap_family = AF_ATMPVC;
 627                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 628                 pvc.sap_addr.vpi = flow->vcc->vpi;
 629                 pvc.sap_addr.vci = flow->vcc->vci;
 630                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
 631                 state = ATM_VF2VS(flow->vcc->flags);
 632                 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
 633         }
 634         if (flow->excess)
 635                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
 636         else {
 637                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
 638         }
 639
 640         nla_nest_end(skb, nest);
 641         return skb->len;
 642
 643 nla_put_failure:
 644         nla_nest_cancel(skb, nest);
 645         return -1;
 646 }
 647 static int
 648 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 649                         struct gnet_dump *d)
 650 {
 651         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 652
 653         flow->qstats.qlen = flow->q->q.qlen;
 654
 655         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 656             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 657                 return -1;
 658
 659         return 0;
 660 }
 661
 662 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 663 {
 664         return 0;
 665 }
 666
 667 static const struct Qdisc_class_ops atm_class_ops = {
 668         .graft          = atm_tc_graft,
 669         .leaf           = atm_tc_leaf,
 670         .get            = atm_tc_get,
 671         .put            = atm_tc_put,
 672         .change         = atm_tc_change,
 673         .delete         = atm_tc_delete,
 674         .walk           = atm_tc_walk,
 675         .tcf_chain      = atm_tc_find_tcf,
 676         .bind_tcf       = atm_tc_bind_filter,
 677         .unbind_tcf     = atm_tc_put,
 678         .dump           = atm_tc_dump_class,
 679         .dump_stats     = atm_tc_dump_class_stats,
 680 };
 681
 682 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 683         .cl_ops         = &atm_class_ops,
 684         .id             = "atm",
 685         .priv_size      = sizeof(struct atm_qdisc_data),
 686         .enqueue        = atm_tc_enqueue,
 687         .dequeue        = atm_tc_dequeue,
 688         .requeue        = atm_tc_requeue,
 689         .drop           = atm_tc_drop,
 690         .init           = atm_tc_init,
 691         .reset          = atm_tc_reset,
 692         .destroy        = atm_tc_destroy,
 693         .dump           = atm_tc_dump,
 694         .owner          = THIS_MODULE,
 695 };
 696
 697 static int __init atm_init(void)
 698 {
 699         return register_qdisc(&atm_qdisc_ops);
 700 }
 701
 702 static void __exit atm_exit(void)
 703 {
 704         unregister_qdisc(&atm_qdisc_ops);
 705 }
 706
 707 module_init(atm_init)
 708 module_exit(atm_exit)
 709 MODULE_LICENSE("GPL");