Linux-2.6.12-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");