net/sched: Retire ATM qdisc (40e8abb8) · Commits · e / devices / android_kernel_fairphone_FP5

net/sched/Kconfig

+0 −14

Original line number	Diff line number	Diff line
		@@ -68,20 +68,6 @@ config NET_SCH_HFSC
		To compile this code as a module, choose M here: the
		module will be called sch_hfsc.

		config NET_SCH_ATM
		tristate "ATM Virtual Circuits (ATM)"
		depends on ATM
		---help---
		Say Y here if you want to use the ATM pseudo-scheduler. This
		provides a framework for invoking classifiers, which in turn
		select classes of this queuing discipline. Each class maps
		the flow(s) it is handling to a given virtual circuit.

		See the top of <file:net/sched/sch_atm.c> for more details.

		To compile this code as a module, choose M here: the
		module will be called sch_atm.

		config NET_SCH_PRIO
		tristate "Multi Band Priority Queueing (PRIO)"
		---help---

net/sched/Makefile

+0 −1

Original line number	Diff line number	Diff line
		@@ -43,7 +43,6 @@ obj-$(CONFIG_NET_SCH_TBF) += sch_tbf.o
		obj-$(CONFIG_NET_SCH_TEQL) += sch_teql.o
		obj-$(CONFIG_NET_SCH_PRIO) += sch_prio.o
		obj-$(CONFIG_NET_SCH_MULTIQ) += sch_multiq.o
		obj-$(CONFIG_NET_SCH_ATM) += sch_atm.o
		obj-$(CONFIG_NET_SCH_NETEM) += sch_netem.o
		obj-$(CONFIG_NET_SCH_DRR) += sch_drr.o
		obj-$(CONFIG_NET_SCH_PLUG) += sch_plug.o

net/sched/sch_atm.c

deleted100644 → 0

+0 −710

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0-only
		/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */

		/* Written 1998-2000 by Werner Almesberger, EPFL ICA */

		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/string.h>
		#include <linux/errno.h>
		#include <linux/skbuff.h>
		#include <linux/atmdev.h>
		#include <linux/atmclip.h>
		#include <linux/rtnetlink.h>
		#include <linux/file.h> /* for fput */
		#include <net/netlink.h>
		#include <net/pkt_sched.h>
		#include <net/pkt_cls.h>

		/*
		* 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 VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))

		struct atm_flow_data {
		struct Qdisc_class_common common;
		struct Qdisc q; / FIFO, TBF, etc. */
		struct tcf_proto __rcu *filter_list;
		struct tcf_block *block;
		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 */
		int ref; /* reference count */
		struct gnet_stats_basic_packed bstats;
		struct gnet_stats_queue qstats;
		struct list_head list;
		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 list_head flows; /* NB: "link" is also on this
		list */
		struct tasklet_struct task; /* dequeue tasklet */
		};

		/* ------------------------- Class/flow operations ------------------------- */

		static inline struct atm_flow_data lookup_flow(struct Qdisc sch, u32 classid)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data *flow;

		list_for_each_entry(flow, &p->flows, list) {
		if (flow->common.classid == classid)
		return flow;
		}
		return NULL;
		}

		static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
		struct Qdisc new, struct Qdisc *old,
		struct netlink_ext_ack *extack)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )arg;

		pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
		sch, p, flow, new, old);
		if (list_empty(&flow->list))
		return -EINVAL;
		if (!new)
		new = &noop_qdisc;
		*old = flow->q;
		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;

		pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
		return flow ? flow->q : NULL;
		}

		static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
		{
		struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
		struct atm_flow_data *flow;

		pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
		flow = lookup_flow(sch, classid);
		pr_debug("%s: flow %p\n", __func__, flow);
		return (unsigned long)flow;
		}

		static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
		unsigned long parent, u32 classid)
		{
		struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
		struct atm_flow_data *flow;

		pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
		flow = lookup_flow(sch, classid);
		if (flow)
		flow->ref++;
		pr_debug("%s: flow %p\n", __func__, flow);
		return (unsigned long)flow;
		}

		/*
		* 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 = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )cl;

		pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
		if (--flow->ref)
		return;
		pr_debug("atm_tc_put: destroying\n");
		list_del_init(&flow->list);
		pr_debug("atm_tc_put: qdisc %p\n", flow->q);
		qdisc_put(flow->q);
		tcf_block_put(flow->block);
		if (flow->sock) {
		pr_debug("atm_tc_put: f_count %ld\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;

		pr_debug("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 const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
		[TCA_ATM_FD] = { .type = NLA_U32 },
		[TCA_ATM_EXCESS] = { .type = NLA_U32 },
		};

		static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
		struct nlattr *tca, unsigned long arg,
		struct netlink_ext_ack *extack)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )*arg;
		struct atm_flow_data *excess = NULL;
		struct nlattr *opt = tca[TCA_OPTIONS];
		struct nlattr *tb[TCA_ATM_MAX + 1];
		struct socket *sock;
		int fd, error, hdr_len;
		void *hdr;

		pr_debug("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)
		return -EINVAL;

		error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
		NULL);
		if (error < 0)
		return error;

		if (!tb[TCA_ATM_FD])
		return -EINVAL;
		fd = nla_get_u32(tb[TCA_ATM_FD]);
		pr_debug("atm_tc_change: fd %d\n", fd);
		if (tb[TCA_ATM_HDR]) {
		hdr_len = nla_len(tb[TCA_ATM_HDR]);
		hdr = nla_data(tb[TCA_ATM_HDR]);
		} else {
		hdr_len = RFC1483LLC_LEN;
		hdr = NULL; /* default LLC/SNAP for IP */
		}
		if (!tb[TCA_ATM_EXCESS])
		excess = NULL;
		else {
		excess = (struct atm_flow_data *)
		atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
		if (!excess)
		return -ENOENT;
		}
		pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
		opt->nla_type, nla_len(opt), hdr_len);
		sock = sockfd_lookup(fd, &error);
		if (!sock)
		return error; /* f_count++ */
		pr_debug("atm_tc_change: f_count %ld\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)) {
		pr_debug("atm_tc_change: classid mismatch\n");
		error = -EINVAL;
		goto err_out;
		}
		} else {
		int i;
		unsigned long cl;

		for (i = 1; i < 0x8000; i++) {
		classid = TC_H_MAKE(sch->handle, 0x8000 \| i);
		cl = atm_tc_find(sch, classid);
		if (!cl)
		break;
		}
		}
		pr_debug("atm_tc_change: new id %x\n", classid);
		flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
		pr_debug("atm_tc_change: flow %p\n", flow);
		if (!flow) {
		error = -ENOBUFS;
		goto err_out;
		}

		error = tcf_block_get(&flow->block, &flow->filter_list, sch,
		extack);
		if (error) {
		kfree(flow);
		goto err_out;
		}

		flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
		extack);
		if (!flow->q)
		flow->q = &noop_qdisc;
		pr_debug("atm_tc_change: qdisc %p\n", flow->q);
		flow->sock = sock;
		flow->vcc = ATM_SD(sock); /* speedup */
		flow->vcc->user_back = flow;
		pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
		flow->old_pop = flow->vcc->pop;
		flow->parent = p;
		flow->vcc->pop = sch_atm_pop;
		flow->common.classid = classid;
		flow->ref = 1;
		flow->excess = excess;
		list_add(&flow->list, &p->link.list);
		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:
		sockfd_put(sock);
		return error;
		}

		static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )arg;

		pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
		if (list_empty(&flow->list))
		return -EINVAL;
		if (rcu_access_pointer(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) {
		pr_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 = qdisc_priv(sch);
		struct atm_flow_data *flow;

		pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
		if (walker->stop)
		return;
		list_for_each_entry(flow, &p->flows, list) {
		if (walker->count >= walker->skip &&
		walker->fn(sch, (unsigned long)flow, walker) < 0) {
		walker->stop = 1;
		break;
		}
		walker->count++;
		}
		}

		static struct tcf_block atm_tc_tcf_block(struct Qdisc sch, unsigned long cl,
		struct netlink_ext_ack *extack)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )cl;

		pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
		return flow ? flow->block : p->link.block;
		}

		/* --------------------------- Qdisc operations ---------------------------- */

		static int atm_tc_enqueue(struct sk_buff skb, struct Qdisc sch,
		struct sk_buff **to_free)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data *flow;
		struct tcf_result res;
		int result;
		int ret = NET_XMIT_SUCCESS \| __NET_XMIT_BYPASS;

		pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
		result = TC_ACT_OK; /* be nice to gcc */
		flow = NULL;
		if (TC_H_MAJ(skb->priority) != sch->handle \|\|
		!(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
		struct tcf_proto *fl;

		list_for_each_entry(flow, &p->flows, list) {
		fl = rcu_dereference_bh(flow->filter_list);
		if (fl) {
		result = tcf_classify(skb, fl, &res, true);
		if (result < 0)
		continue;
		if (result == TC_ACT_SHOT)
		goto done;

		flow = (struct atm_flow_data *)res.class;
		if (!flow)
		flow = lookup_flow(sch, res.classid);
		goto drop;
		}
		}
		flow = NULL;
		done:
		;
		}
		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_ACT
		switch (result) {
		case TC_ACT_QUEUED:
		case TC_ACT_STOLEN:
		case TC_ACT_TRAP:
		__qdisc_drop(skb, to_free);
		return NET_XMIT_SUCCESS \| __NET_XMIT_STOLEN;
		case TC_ACT_SHOT:
		__qdisc_drop(skb, to_free);
		goto drop;
		case TC_ACT_RECLASSIFY:
		if (flow->excess)
		flow = flow->excess;
		else
		ATM_SKB(skb)->atm_options \|= ATM_ATMOPT_CLP;
		break;
		}
		#endif
		}

		ret = qdisc_enqueue(skb, flow->q, to_free);
		if (ret != NET_XMIT_SUCCESS) {
		drop: __maybe_unused
		if (net_xmit_drop_count(ret)) {
		qdisc_qstats_drop(sch);
		if (flow)
		flow->qstats.drops++;
		}
		return ret;
		}
		/*
		* 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 NET_XMIT_SUCCESS;
		}
		tasklet_schedule(&p->task);
		return NET_XMIT_SUCCESS \| __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 = qdisc_priv(sch);
		struct atm_flow_data *flow;
		struct sk_buff *skb;

		pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
		list_for_each_entry(flow, &p->flows, list) {
		if (flow == &p->link)
		continue;
		/*
		* If traffic is properly shaped, this won't generate nasty
		* little bursts. Otherwise, it may ... (but that's okay)
		*/
		while ((skb = flow->q->ops->peek(flow->q))) {
		if (!atm_may_send(flow->vcc, skb->truesize))
		break;

		skb = qdisc_dequeue_peeked(flow->q);
		if (unlikely(!skb))
		break;

		qdisc_bstats_update(sch, skb);
		bstats_update(&flow->bstats, skb);
		pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
		/* remove any LL header somebody else has attached */
		skb_pull(skb, skb_network_offset(skb));
		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;
		}
		pr_debug("sch_atm_dequeue: ip %p, data %p\n",
		skb_network_header(skb), skb->data);
		ATM_SKB(skb)->vcc = flow->vcc;
		memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
		flow->hdr_len);
		refcount_add(skb->truesize,
		&sk_atm(flow->vcc)->sk_wmem_alloc);
		/* atm.atm_options are already set by atm_tc_enqueue */
		flow->vcc->send(flow->vcc, skb);
		}
		}
		}

		static struct sk_buff atm_tc_dequeue(struct Qdisc sch)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct sk_buff *skb;

		pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
		tasklet_schedule(&p->task);
		skb = qdisc_dequeue_peeked(p->link.q);
		if (skb)
		sch->q.qlen--;
		return skb;
		}

		static struct sk_buff atm_tc_peek(struct Qdisc sch)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);

		pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);

		return p->link.q->ops->peek(p->link.q);
		}

		static int atm_tc_init(struct Qdisc sch, struct nlattr opt,
		struct netlink_ext_ack *extack)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		int err;

		pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
		INIT_LIST_HEAD(&p->flows);
		INIT_LIST_HEAD(&p->link.list);
		list_add(&p->link.list, &p->flows);
		p->link.q = qdisc_create_dflt(sch->dev_queue,
		&pfifo_qdisc_ops, sch->handle, extack);
		if (!p->link.q)
		p->link.q = &noop_qdisc;
		pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
		p->link.vcc = NULL;
		p->link.sock = NULL;
		p->link.common.classid = sch->handle;
		p->link.ref = 1;

		err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
		extack);
		if (err)
		return err;

		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 = qdisc_priv(sch);
		struct atm_flow_data *flow;

		pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
		list_for_each_entry(flow, &p->flows, list)
		qdisc_reset(flow->q);
		sch->q.qlen = 0;
		}

		static void atm_tc_destroy(struct Qdisc *sch)
		{
		struct atm_qdisc_data *p = qdisc_priv(sch);
		struct atm_flow_data flow, tmp;

		pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
		list_for_each_entry(flow, &p->flows, list) {
		tcf_block_put(flow->block);
		flow->block = NULL;
		}

		list_for_each_entry_safe(flow, tmp, &p->flows, list) {
		if (flow->ref > 1)
		pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
		atm_tc_put(sch, (unsigned long)flow);
		}
		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 = qdisc_priv(sch);
		struct atm_flow_data flow = (struct atm_flow_data )cl;
		struct nlattr *nest;

		pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
		sch, p, flow, skb, tcm);
		if (list_empty(&flow->list))
		return -EINVAL;
		tcm->tcm_handle = flow->common.classid;
		tcm->tcm_info = flow->q->handle;

		nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
		if (nest == NULL)
		goto nla_put_failure;

		if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
		goto nla_put_failure;
		if (flow->vcc) {
		struct sockaddr_atmpvc pvc;
		int state;

		memset(&pvc, 0, sizeof(pvc));
		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;
		if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
		goto nla_put_failure;
		state = ATM_VF2VS(flow->vcc->flags);
		if (nla_put_u32(skb, TCA_ATM_STATE, state))
		goto nla_put_failure;
		}
		if (flow->excess) {
		if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
		goto nla_put_failure;
		} else {
		if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
		goto nla_put_failure;
		}
		return nla_nest_end(skb, nest);

		nla_put_failure:
		nla_nest_cancel(skb, nest);
		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;

		if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
		d, NULL, &flow->bstats) < 0 \|\|
		gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
		return -1;

		return 0;
		}

		static int atm_tc_dump(struct Qdisc sch, struct sk_buff skb)
		{
		return 0;
		}

		static const struct Qdisc_class_ops atm_class_ops = {
		.graft = atm_tc_graft,
		.leaf = atm_tc_leaf,
		.find = atm_tc_find,
		.change = atm_tc_change,
		.delete = atm_tc_delete,
		.walk = atm_tc_walk,
		.tcf_block = atm_tc_tcf_block,
		.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 __read_mostly = {
		.cl_ops = &atm_class_ops,
		.id = "atm",
		.priv_size = sizeof(struct atm_qdisc_data),
		.enqueue = atm_tc_enqueue,
		.dequeue = atm_tc_dequeue,
		.peek = atm_tc_peek,
		.init = atm_tc_init,
		.reset = atm_tc_reset,
		.destroy = atm_tc_destroy,
		.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");