Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 735 insertions, 0 deletions

diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
new file mode 100644
index 000000000000..93ebce40acac
--- /dev/null
+++ b/net/sched/sch_atm.c
@@ -0,0 +1,735 @@
+/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
+
+/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/interrupt.h>
+#include <linux/atmdev.h>
+#include <linux/atmclip.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/file.h> /* for fput */
+#include <net/pkt_sched.h>
+#include <net/sock.h>
+
+
+extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
+
+#if 0 /* control */
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+#if 0 /* data */
+#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define D2PRINTK(format,args...)
+#endif
+
+
+/*
+ * The ATM queuing discipline provides a framework for invoking classifiers
+ * (aka "filters"), which in turn select classes of this queuing discipline.
+ * Each class maps the flow(s) it is handling to a given VC. Multiple classes
+ * may share the same VC.
+ *
+ * When creating a class, VCs are specified by passing the number of the open
+ * socket descriptor by which the calling process references the VC. The kernel
+ * keeps the VC open at least until all classes using it are removed.
+ *
+ * In this file, most functions are named atm_tc_* to avoid confusion with all
+ * the atm_* in net/atm. This naming convention differs from what's used in the
+ * rest of net/sched.
+ *
+ * Known bugs:
+ *  - sometimes messes up the IP stack
+ *  - any manipulations besides the few operations described in the README, are
+ *    untested and likely to crash the system
+ *  - should lock the flow while there is data in the queue (?)
+ */
+
+
+#define PRIV(sch) qdisc_priv(sch)
+#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
+
+
+struct atm_flow_data {
+        struct Qdisc            *q;             /* FIFO, TBF, etc. */
+        struct tcf_proto        *filter_list;
+        struct atm_vcc          *vcc;           /* VCC; NULL if VCC is closed */
+        void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
+        struct atm_qdisc_data   *parent;        /* parent qdisc */
+        struct socket           *sock;          /* for closing */
+        u32                     classid;        /* x:y type ID */
+        int                     ref;            /* reference count */
+        struct gnet_stats_basic bstats;
+        struct gnet_stats_queue qstats;
+        spinlock_t              *stats_lock;
+        struct atm_flow_data    *next;
+        struct atm_flow_data    *excess;        /* flow for excess traffic;
+                                                   NULL to set CLP instead */
+        int                     hdr_len;
+        unsigned char           hdr[0];         /* header data; MUST BE LAST */
+};
+
+struct atm_qdisc_data {
+        struct atm_flow_data    link;           /* unclassified skbs go here */
+        struct atm_flow_data    *flows;         /* NB: "link" is also on this
+                                                   list */
+        struct tasklet_struct   task;           /* requeue tasklet */
+};
+
+
+/* ------------------------- Class/flow operations ------------------------- */
+
+
+static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
+{
+        struct atm_flow_data *walk;
+
+        DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
+        for (walk = qdisc->flows; walk; walk = walk->next)
+                if (walk == flow) return 1;
+        DPRINTK("find_flow: not found\n");
+        return 0;
+}
+
+
+static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
+    u32 classid)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+
+        for (flow = p->flows; flow; flow = flow->next)
+                if (flow->classid == classid) break;
+        return flow;
+}
+
+
+static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
+    struct Qdisc *new,struct Qdisc **old)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) arg;
+
+        DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
+            p,flow,new,old);
+        if (!find_flow(p,flow)) return -EINVAL;
+        if (!new) new = &noop_qdisc;
+        *old = xchg(&flow->q,new);
+        if (*old) qdisc_reset(*old);
+        return 0;
+}
+
+
+static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
+{
+        struct atm_flow_data *flow = (struct atm_flow_data *) cl;
+
+        DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
+        return flow ? flow->q : NULL;
+}
+
+
+static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
+{
+        struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
+        struct atm_flow_data *flow;
+
+        DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
+        flow = lookup_flow(sch,classid);
+        if (flow) flow->ref++;
+        DPRINTK("atm_tc_get: flow %p\n",flow);
+        return (unsigned long) flow;
+}
+
+
+static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
+    unsigned long parent, u32 classid)
+{
+        return atm_tc_get(sch,classid);
+}
+
+
+static void destroy_filters(struct atm_flow_data *flow)
+{
+        struct tcf_proto *filter;
+
+        while ((filter = flow->filter_list)) {
+                DPRINTK("destroy_filters: destroying filter %p\n",filter);
+                flow->filter_list = filter->next;
+                tcf_destroy(filter);
+        }
+}
+
+
+/*
+ * atm_tc_put handles all destructions, including the ones that are explicitly
+ * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
+ * anything that still seems to be in use.
+ */
+
+static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) cl;
+        struct atm_flow_data **prev;
+
+        DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
+        if (--flow->ref) return;
+        DPRINTK("atm_tc_put: destroying\n");
+        for (prev = &p->flows; *prev; prev = &(*prev)->next)
+                if (*prev == flow) break;
+        if (!*prev) {
+                printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
+                return;
+        }
+        *prev = flow->next;
+        DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
+        qdisc_destroy(flow->q);
+        destroy_filters(flow);
+        if (flow->sock) {
+                DPRINTK("atm_tc_put: f_count %d\n",
+                    file_count(flow->sock->file));
+                flow->vcc->pop = flow->old_pop;
+                sockfd_put(flow->sock);
+        }
+        if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
+        if (flow != &p->link) kfree(flow);
+        /*
+         * If flow == &p->link, the qdisc no longer works at this point and
+         * needs to be removed. (By the caller of atm_tc_put.)
+         */
+}
+
+
+static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
+{
+        struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
+
+        D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
+        VCC2FLOW(vcc)->old_pop(vcc,skb);
+        tasklet_schedule(&p->task);
+}
+
+static const u8 llc_oui_ip[] = {
+        0xaa,           /* DSAP: non-ISO */
+        0xaa,           /* SSAP: non-ISO */
+        0x03,           /* Ctrl: Unnumbered Information Command PDU */
+        0x00,           /* OUI: EtherType */
+        0x00, 0x00,
+        0x08, 0x00 };   /* Ethertype IP (0800) */
+
+static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
+    struct rtattr **tca, unsigned long *arg)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
+        struct atm_flow_data *excess = NULL;
+        struct rtattr *opt = tca[TCA_OPTIONS-1];
+        struct rtattr *tb[TCA_ATM_MAX];
+        struct socket *sock;
+        int fd,error,hdr_len;
+        void *hdr;
+
+        DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
+            "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
+        /*
+         * The concept of parents doesn't apply for this qdisc.
+         */
+        if (parent && parent != TC_H_ROOT && parent != sch->handle)
+                return -EINVAL;
+        /*
+         * ATM classes cannot be changed. In order to change properties of the
+         * ATM connection, that socket needs to be modified directly (via the
+         * native ATM API. In order to send a flow to a different VC, the old
+         * class needs to be removed and a new one added. (This may be changed
+         * later.)
+         */
+        if (flow) return -EBUSY;
+        if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
+                return -EINVAL;
+        if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
+                return -EINVAL;
+        fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
+        DPRINTK("atm_tc_change: fd %d\n",fd);
+        if (tb[TCA_ATM_HDR-1]) {
+                hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
+                hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
+        }
+        else {
+                hdr_len = RFC1483LLC_LEN;
+                hdr = NULL; /* default LLC/SNAP for IP */
+        }
+        if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
+        else {
+                if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
+                        return -EINVAL;
+                excess = (struct atm_flow_data *) atm_tc_get(sch,
+                    *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
+                if (!excess) return -ENOENT;
+        }
+        DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
+            opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
+        if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
+        DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
+        if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
+                error = -EPROTOTYPE;
+                goto err_out;
+        }
+        /* @@@ should check if the socket is really operational or we'll crash
+           on vcc->send */
+        if (classid) {
+                if (TC_H_MAJ(classid ^ sch->handle)) {
+                        DPRINTK("atm_tc_change: classid mismatch\n");
+                        error = -EINVAL;
+                        goto err_out;
+                }
+                if (find_flow(p,flow)) {
+                        error = -EEXIST;
+                        goto err_out;
+                }
+        }
+        else {
+                int i;
+                unsigned long cl;
+
+                for (i = 1; i < 0x8000; i++) {
+                        classid = TC_H_MAKE(sch->handle,0x8000 | i);
+                        if (!(cl = atm_tc_get(sch,classid))) break;
+                        atm_tc_put(sch,cl);
+                }
+        }
+        DPRINTK("atm_tc_change: new id %x\n",classid);
+        flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
+        DPRINTK("atm_tc_change: flow %p\n",flow);
+        if (!flow) {
+                error = -ENOBUFS;
+                goto err_out;
+        }
+        memset(flow,0,sizeof(*flow));
+        flow->filter_list = NULL;
+        if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
+                flow->q = &noop_qdisc;
+        DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
+        flow->sock = sock;
+        flow->vcc = ATM_SD(sock); /* speedup */
+        flow->vcc->user_back = flow;
+        DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
+        flow->old_pop = flow->vcc->pop;
+        flow->parent = p;
+        flow->vcc->pop = sch_atm_pop;
+        flow->classid = classid;
+        flow->ref = 1;
+        flow->excess = excess;
+        flow->next = p->link.next;
+        p->link.next = flow;
+        flow->hdr_len = hdr_len;
+        if (hdr)
+                memcpy(flow->hdr,hdr,hdr_len);
+        else
+                memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip));
+        *arg = (unsigned long) flow;
+        return 0;
+err_out:
+        if (excess) atm_tc_put(sch,(unsigned long) excess);
+        sockfd_put(sock);
+        return error;
+}
+
+
+static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) arg;
+
+        DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
+        if (!find_flow(PRIV(sch),flow)) return -EINVAL;
+        if (flow->filter_list || flow == &p->link) return -EBUSY;
+        /*
+         * Reference count must be 2: one for "keepalive" (set at class
+         * creation), and one for the reference held when calling delete.
+         */
+        if (flow->ref < 2) {
+                printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
+                return -EINVAL;
+        }
+        if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
+        atm_tc_put(sch,arg);
+        return 0;
+}
+
+
+static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+
+        DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
+        if (walker->stop) return;
+        for (flow = p->flows; flow; flow = flow->next) {
+                if (walker->count >= walker->skip)
+                        if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
+                                walker->stop = 1;
+                                break;
+                        }
+                walker->count++;
+        }
+}
+
+
+static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) cl;
+
+        DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
+        return flow ? &flow->filter_list : &p->link.filter_list;
+}
+
+
+/* --------------------------- Qdisc operations ---------------------------- */
+
+
+static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = NULL ; /* @@@ */
+        struct tcf_result res;
+        int result;
+        int ret = NET_XMIT_POLICED;
+
+        D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
+        result = TC_POLICE_OK; /* be nice to gcc */
+        if (TC_H_MAJ(skb->priority) != sch->handle ||
+            !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
+                for (flow = p->flows; flow; flow = flow->next)
+                        if (flow->filter_list) {
+                                result = tc_classify(skb,flow->filter_list,
+                                    &res);
+                                if (result < 0) continue;
+                                flow = (struct atm_flow_data *) res.class;
+                                if (!flow) flow = lookup_flow(sch,res.classid);
+                                break;
+                        }
+        if (!flow) flow = &p->link;
+        else {
+                if (flow->vcc)
+                        ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
+                        /*@@@ looks good ... but it's not supposed to work :-)*/
+#ifdef CONFIG_NET_CLS_POLICE
+                switch (result) {
+                        case TC_POLICE_SHOT:
+                                kfree_skb(skb);
+                                break;
+                        case TC_POLICE_RECLASSIFY:
+                                if (flow->excess) flow = flow->excess;
+                                else {
+                                        ATM_SKB(skb)->atm_options |=
+                                            ATM_ATMOPT_CLP;
+                                        break;
+                                }
+                                /* fall through */
+                        case TC_POLICE_OK:
+                                /* fall through */
+                        default:
+                                break;
+                }
+#endif
+        }
+        if (
+#ifdef CONFIG_NET_CLS_POLICE
+            result == TC_POLICE_SHOT ||
+#endif
+            (ret = flow->q->enqueue(skb,flow->q)) != 0) {
+                sch->qstats.drops++;
+                if (flow) flow->qstats.drops++;
+                return ret;
+        }
+        sch->bstats.bytes += skb->len;
+        sch->bstats.packets++;
+        flow->bstats.bytes += skb->len;
+        flow->bstats.packets++;
+        /*
+         * Okay, this may seem weird. We pretend we've dropped the packet if
+         * it goes via ATM. The reason for this is that the outer qdisc
+         * expects to be able to q->dequeue the packet later on if we return
+         * success at this place. Also, sch->q.qdisc needs to reflect whether
+         * there is a packet egligible for dequeuing or not. Note that the
+         * statistics of the outer qdisc are necessarily wrong because of all
+         * this. There's currently no correct solution for this.
+         */
+        if (flow == &p->link) {
+                sch->q.qlen++;
+                return 0;
+        }
+        tasklet_schedule(&p->task);
+        return NET_XMIT_BYPASS;
+}
+
+
+/*
+ * Dequeue packets and send them over ATM. Note that we quite deliberately
+ * avoid checking net_device's flow control here, simply because sch_atm
+ * uses its own channels, which have nothing to do with any CLIP/LANE/or
+ * non-ATM interfaces.
+ */
+
+
+static void sch_atm_dequeue(unsigned long data)
+{
+        struct Qdisc *sch = (struct Qdisc *) data;
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+        struct sk_buff *skb;
+
+        D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
+        for (flow = p->link.next; flow; flow = flow->next)
+                /*
+                 * If traffic is properly shaped, this won't generate nasty
+                 * little bursts. Otherwise, it may ... (but that's okay)
+                 */
+                while ((skb = flow->q->dequeue(flow->q))) {
+                        if (!atm_may_send(flow->vcc,skb->truesize)) {
+                                (void) flow->q->ops->requeue(skb,flow->q);
+                                break;
+                        }
+                        D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow);
+                        /* remove any LL header somebody else has attached */
+                        skb_pull(skb,(char *) skb->nh.iph-(char *) skb->data);
+                        if (skb_headroom(skb) < flow->hdr_len) {
+                                struct sk_buff *new;
+
+                                new = skb_realloc_headroom(skb,flow->hdr_len);
+                                dev_kfree_skb(skb);
+                                if (!new) continue;
+                                skb = new;
+                        }
+                        D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
+                            skb->nh.iph,skb->data);
+                        ATM_SKB(skb)->vcc = flow->vcc;
+                        memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
+                            flow->hdr_len);
+                        atomic_add(skb->truesize,
+                                   &sk_atm(flow->vcc)->sk_wmem_alloc);
+                        /* atm.atm_options are already set by atm_tc_enqueue */
+                        (void) flow->vcc->send(flow->vcc,skb);
+                }
+}
+
+
+static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct sk_buff *skb;
+
+        D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
+        tasklet_schedule(&p->task);
+        skb = p->link.q->dequeue(p->link.q);
+        if (skb) sch->q.qlen--;
+        return skb;
+}
+
+
+static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        int ret;
+
+        D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
+        ret = p->link.q->ops->requeue(skb,p->link.q);
+        if (!ret) {
+        sch->q.qlen++;
+        sch->qstats.requeues++;
+    } else {
+                sch->qstats.drops++;
+                p->link.qstats.drops++;
+        }
+        return ret;
+}
+
+
+static unsigned int atm_tc_drop(struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+        unsigned int len;
+
+        DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
+        for (flow = p->flows; flow; flow = flow->next)
+                if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
+                        return len;
+        return 0;
+}
+
+
+static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+
+        DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
+        p->flows = &p->link;
+        if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
+                p->link.q = &noop_qdisc;
+        DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
+        p->link.filter_list = NULL;
+        p->link.vcc = NULL;
+        p->link.sock = NULL;
+        p->link.classid = sch->handle;
+        p->link.ref = 1;
+        p->link.next = NULL;
+        tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
+        return 0;
+}
+
+
+static void atm_tc_reset(struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+
+        DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
+        for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
+        sch->q.qlen = 0;
+}
+
+
+static void atm_tc_destroy(struct Qdisc *sch)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow;
+
+        DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
+        /* races ? */
+        while ((flow = p->flows)) {
+                destroy_filters(flow);
+                if (flow->ref > 1)
+                        printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
+                            flow->ref);
+                atm_tc_put(sch,(unsigned long) flow);
+                if (p->flows == flow) {
+                        printk(KERN_ERR "atm_destroy: putting flow %p didn't "
+                            "kill it\n",flow);
+                        p->flows = flow->next; /* brute force */
+                        break;
+                }
+        }
+        tasklet_kill(&p->task);
+}
+
+
+static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
+    struct sk_buff *skb, struct tcmsg *tcm)
+{
+        struct atm_qdisc_data *p = PRIV(sch);
+        struct atm_flow_data *flow = (struct atm_flow_data *) cl;
+        unsigned char *b = skb->tail;
+        struct rtattr *rta;
+
+        DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
+            sch,p,flow,skb,tcm);
+        if (!find_flow(p,flow)) return -EINVAL;
+        tcm->tcm_handle = flow->classid;
+        rta = (struct rtattr *) b;
+        RTA_PUT(skb,TCA_OPTIONS,0,NULL);
+        RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
+        if (flow->vcc) {
+                struct sockaddr_atmpvc pvc;
+                int state;
+
+                pvc.sap_family = AF_ATMPVC;
+                pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
+                pvc.sap_addr.vpi = flow->vcc->vpi;
+                pvc.sap_addr.vci = flow->vcc->vci;
+                RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
+                state = ATM_VF2VS(flow->vcc->flags);
+                RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
+        }
+        if (flow->excess)
+                RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
+        else {
+                static u32 zero;
+
+                RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
+        }
+        rta->rta_len = skb->tail-b;
+        return skb->len;
+
+rtattr_failure:
+        skb_trim(skb,b-skb->data);
+        return -1;
+}
+static int
+atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
+        struct gnet_dump *d)
+{
+        struct atm_flow_data *flow = (struct atm_flow_data *) arg;
+
+        flow->qstats.qlen = flow->q->q.qlen;
+
+        if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
+            gnet_stats_copy_queue(d, &flow->qstats) < 0)
+                return -1;
+
+        return 0;
+}
+
+static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+        return 0;
+}
+
+static struct Qdisc_class_ops atm_class_ops = {
+        .graft          =       atm_tc_graft,
+        .leaf           =       atm_tc_leaf,
+        .get            =       atm_tc_get,
+        .put            =       atm_tc_put,
+        .change         =       atm_tc_change,
+        .delete         =       atm_tc_delete,
+        .walk           =       atm_tc_walk,
+        .tcf_chain      =       atm_tc_find_tcf,
+        .bind_tcf       =       atm_tc_bind_filter,
+        .unbind_tcf     =       atm_tc_put,
+        .dump           =       atm_tc_dump_class,
+        .dump_stats     =       atm_tc_dump_class_stats,
+};
+
+static struct Qdisc_ops atm_qdisc_ops = {
+        .next           =       NULL,
+        .cl_ops         =       &atm_class_ops,
+        .id             =       "atm",
+        .priv_size      =       sizeof(struct atm_qdisc_data),
+        .enqueue        =       atm_tc_enqueue,
+        .dequeue        =       atm_tc_dequeue,
+        .requeue        =       atm_tc_requeue,
+        .drop           =       atm_tc_drop,
+        .init           =       atm_tc_init,
+        .reset          =       atm_tc_reset,
+        .destroy        =       atm_tc_destroy,
+        .change         =       NULL,
+        .dump           =       atm_tc_dump,
+        .owner          =       THIS_MODULE,
+};
+
+
+static int __init atm_init(void)
+{
+        return register_qdisc(&atm_qdisc_ops);
+}
+
+static void __exit atm_exit(void) 
+{
+        unregister_qdisc(&atm_qdisc_ops);
+}
+
+module_init(atm_init)
+module_exit(atm_exit)
+MODULE_LICENSE("GPL");