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, 1296 insertions, 0 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
new file mode 100644
index 000000000000..4323a74eea30
--- /dev/null
+++ b/net/sched/sch_api.c
@@ -0,0 +1,1296 @@
+/*
+ * net/sched/sch_api.c	Packet scheduler API.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Fixes:
+ *
+ * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
+ * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
+ * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/bitops.h>
+
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid,
+			struct Qdisc *old, struct Qdisc *new);
+static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n,
+			 struct Qdisc *q, unsigned long cl, int event);
+
+/*
+
+   Short review.
+   -------------
+
+   This file consists of two interrelated parts:
+
+   1. queueing disciplines manager frontend.
+   2. traffic classes manager frontend.
+
+   Generally, queueing discipline ("qdisc") is a black box,
+   which is able to enqueue packets and to dequeue them (when
+   device is ready to send something) in order and at times
+   determined by algorithm hidden in it.
+
+   qdisc's are divided to two categories:
+   - "queues", which have no internal structure visible from outside.
+   - "schedulers", which split all the packets to "traffic classes",
+     using "packet classifiers" (look at cls_api.c)
+
+   In turn, classes may have child qdiscs (as rule, queues)
+   attached to them etc. etc. etc.
+
+   The goal of the routines in this file is to translate
+   information supplied by user in the form of handles
+   to more intelligible for kernel form, to make some sanity
+   checks and part of work, which is common to all qdiscs
+   and to provide rtnetlink notifications.
+
+   All real intelligent work is done inside qdisc modules.
+
+
+
+   Every discipline has two major routines: enqueue and dequeue.
+
+   ---dequeue
+
+   dequeue usually returns a skb to send. It is allowed to return NULL,
+   but it does not mean that queue is empty, it just means that
+   discipline does not want to send anything this time.
+   Queue is really empty if q->q.qlen == 0.
+   For complicated disciplines with multiple queues q->q is not
+   real packet queue, but however q->q.qlen must be valid.
+
+   ---enqueue
+
+   enqueue returns 0, if packet was enqueued successfully.
+   If packet (this one or another one) was dropped, it returns
+   not zero error code.
+   NET_XMIT_DROP 	- this packet dropped
+     Expected action: do not backoff, but wait until queue will clear.
+   NET_XMIT_CN	 	- probably this packet enqueued, but another one dropped.
+     Expected action: backoff or ignore
+   NET_XMIT_POLICED	- dropped by police.
+     Expected action: backoff or error to real-time apps.
+
+   Auxiliary routines:
+
+   ---requeue
+
+   requeues once dequeued packet. It is used for non-standard or
+   just buggy devices, which can defer output even if dev->tbusy=0.
+
+   ---reset
+
+   returns qdisc to initial state: purge all buffers, clear all
+   timers, counters (except for statistics) etc.
+
+   ---init
+
+   initializes newly created qdisc.
+
+   ---destroy
+
+   destroys resources allocated by init and during lifetime of qdisc.
+
+   ---change
+
+   changes qdisc parameters.
+ */
+
+/* Protects list of registered TC modules. It is pure SMP lock. */
+static DEFINE_RWLOCK(qdisc_mod_lock);
+
+
+/************************************************
+ *	Queueing disciplines manipulation.	*
+ ************************************************/
+
+
+/* The list of all installed queueing disciplines. */
+
+static struct Qdisc_ops *qdisc_base;
+
+/* Register/uregister queueing discipline */
+
+int register_qdisc(struct Qdisc_ops *qops)
+{
+	struct Qdisc_ops *q, **qp;
+	int rc = -EEXIST;
+
+	write_lock(&qdisc_mod_lock);
+	for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
+		if (!strcmp(qops->id, q->id))
+			goto out;
+
+	if (qops->enqueue == NULL)
+		qops->enqueue = noop_qdisc_ops.enqueue;
+	if (qops->requeue == NULL)
+		qops->requeue = noop_qdisc_ops.requeue;
+	if (qops->dequeue == NULL)
+		qops->dequeue = noop_qdisc_ops.dequeue;
+
+	qops->next = NULL;
+	*qp = qops;
+	rc = 0;
+out:
+	write_unlock(&qdisc_mod_lock);
+	return rc;
+}
+
+int unregister_qdisc(struct Qdisc_ops *qops)
+{
+	struct Qdisc_ops *q, **qp;
+	int err = -ENOENT;
+
+	write_lock(&qdisc_mod_lock);
+	for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next)
+		if (q == qops)
+			break;
+	if (q) {
+		*qp = q->next;
+		q->next = NULL;
+		err = 0;
+	}
+	write_unlock(&qdisc_mod_lock);
+	return err;
+}
+
+/* We know handle. Find qdisc among all qdisc's attached to device
+   (root qdisc, all its children, children of children etc.)
+ */
+
+struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
+{
+	struct Qdisc *q;
+
+	read_lock_bh(&qdisc_tree_lock);
+	list_for_each_entry(q, &dev->qdisc_list, list) {
+		if (q->handle == handle) {
+			read_unlock_bh(&qdisc_tree_lock);
+			return q;
+		}
+	}
+	read_unlock_bh(&qdisc_tree_lock);
+	return NULL;
+}
+
+static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
+{
+	unsigned long cl;
+	struct Qdisc *leaf;
+	struct Qdisc_class_ops *cops = p->ops->cl_ops;
+
+	if (cops == NULL)
+		return NULL;
+	cl = cops->get(p, classid);
+
+	if (cl == 0)
+		return NULL;
+	leaf = cops->leaf(p, cl);
+	cops->put(p, cl);
+	return leaf;
+}
+
+/* Find queueing discipline by name */
+
+static struct Qdisc_ops *qdisc_lookup_ops(struct rtattr *kind)
+{
+	struct Qdisc_ops *q = NULL;
+
+	if (kind) {
+		read_lock(&qdisc_mod_lock);
+		for (q = qdisc_base; q; q = q->next) {
+			if (rtattr_strcmp(kind, q->id) == 0) {
+				if (!try_module_get(q->owner))
+					q = NULL;
+				break;
+			}
+		}
+		read_unlock(&qdisc_mod_lock);
+	}
+	return q;
+}
+
+static struct qdisc_rate_table *qdisc_rtab_list;
+
+struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab)
+{
+	struct qdisc_rate_table *rtab;
+
+	for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
+		if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) {
+			rtab->refcnt++;
+			return rtab;
+		}
+	}
+
+	if (tab == NULL || r->rate == 0 || r->cell_log == 0 || RTA_PAYLOAD(tab) != 1024)
+		return NULL;
+
+	rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
+	if (rtab) {
+		rtab->rate = *r;
+		rtab->refcnt = 1;
+		memcpy(rtab->data, RTA_DATA(tab), 1024);
+		rtab->next = qdisc_rtab_list;
+		qdisc_rtab_list = rtab;
+	}
+	return rtab;
+}
+
+void qdisc_put_rtab(struct qdisc_rate_table *tab)
+{
+	struct qdisc_rate_table *rtab, **rtabp;
+
+	if (!tab || --tab->refcnt)
+		return;
+
+	for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) {
+		if (rtab == tab) {
+			*rtabp = rtab->next;
+			kfree(rtab);
+			return;
+		}
+	}
+}
+
+
+/* Allocate an unique handle from space managed by kernel */
+
+static u32 qdisc_alloc_handle(struct net_device *dev)
+{
+	int i = 0x10000;
+	static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
+
+	do {
+		autohandle += TC_H_MAKE(0x10000U, 0);
+		if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
+			autohandle = TC_H_MAKE(0x80000000U, 0);
+	} while	(qdisc_lookup(dev, autohandle) && --i > 0);
+
+	return i>0 ? autohandle : 0;
+}
+
+/* Attach toplevel qdisc to device dev */
+
+static struct Qdisc *
+dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc)
+{
+	struct Qdisc *oqdisc;
+
+	if (dev->flags & IFF_UP)
+		dev_deactivate(dev);
+
+	qdisc_lock_tree(dev);
+	if (qdisc && qdisc->flags&TCQ_F_INGRESS) {
+		oqdisc = dev->qdisc_ingress;
+		/* Prune old scheduler */
+		if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) {
+			/* delete */
+			qdisc_reset(oqdisc);
+			dev->qdisc_ingress = NULL;
+		} else {  /* new */
+			dev->qdisc_ingress = qdisc;
+		}
+
+	} else {
+
+		oqdisc = dev->qdisc_sleeping;
+
+		/* Prune old scheduler */
+		if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
+			qdisc_reset(oqdisc);
+
+		/* ... and graft new one */
+		if (qdisc == NULL)
+			qdisc = &noop_qdisc;
+		dev->qdisc_sleeping = qdisc;
+		dev->qdisc = &noop_qdisc;
+	}
+
+	qdisc_unlock_tree(dev);
+
+	if (dev->flags & IFF_UP)
+		dev_activate(dev);
+
+	return oqdisc;
+}
+
+
+/* Graft qdisc "new" to class "classid" of qdisc "parent" or
+   to device "dev".
+
+   Old qdisc is not destroyed but returned in *old.
+ */
+
+static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
+		       u32 classid,
+		       struct Qdisc *new, struct Qdisc **old)
+{
+	int err = 0;
+	struct Qdisc *q = *old;
+
+
+	if (parent == NULL) { 
+		if (q && q->flags&TCQ_F_INGRESS) {
+			*old = dev_graft_qdisc(dev, q);
+		} else {
+			*old = dev_graft_qdisc(dev, new);
+		}
+	} else {
+		struct Qdisc_class_ops *cops = parent->ops->cl_ops;
+
+		err = -EINVAL;
+
+		if (cops) {
+			unsigned long cl = cops->get(parent, classid);
+			if (cl) {
+				err = cops->graft(parent, cl, new, old);
+				if (new)
+					new->parent = classid;
+				cops->put(parent, cl);
+			}
+		}
+	}
+	return err;
+}
+
+/*
+   Allocate and initialize new qdisc.
+
+   Parameters are passed via opt.
+ */
+
+static struct Qdisc *
+qdisc_create(struct net_device *dev, u32 handle, struct rtattr **tca, int *errp)
+{
+	int err;
+	struct rtattr *kind = tca[TCA_KIND-1];
+	void *p = NULL;
+	struct Qdisc *sch;
+	struct Qdisc_ops *ops;
+	int size;
+
+	ops = qdisc_lookup_ops(kind);
+#ifdef CONFIG_KMOD
+	if (ops == NULL && kind != NULL) {
+		char name[IFNAMSIZ];
+		if (rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
+			/* We dropped the RTNL semaphore in order to
+			 * perform the module load.  So, even if we
+			 * succeeded in loading the module we have to
+			 * tell the caller to replay the request.  We
+			 * indicate this using -EAGAIN.
+			 * We replay the request because the device may
+			 * go away in the mean time.
+			 */
+			rtnl_unlock();
+			request_module("sch_%s", name);
+			rtnl_lock();
+			ops = qdisc_lookup_ops(kind);
+			if (ops != NULL) {
+				/* We will try again qdisc_lookup_ops,
+				 * so don't keep a reference.
+				 */
+				module_put(ops->owner);
+				err = -EAGAIN;
+				goto err_out;
+			}
+		}
+	}
+#endif
+
+	err = -EINVAL;
+	if (ops == NULL)
+		goto err_out;
+
+	/* ensure that the Qdisc and the private data are 32-byte aligned */
+	size = ((sizeof(*sch) + QDISC_ALIGN_CONST) & ~QDISC_ALIGN_CONST);
+	size += ops->priv_size + QDISC_ALIGN_CONST;
+
+	p = kmalloc(size, GFP_KERNEL);
+	err = -ENOBUFS;
+	if (!p)
+		goto err_out2;
+	memset(p, 0, size);
+	sch = (struct Qdisc *)(((unsigned long)p + QDISC_ALIGN_CONST)
+	                       & ~QDISC_ALIGN_CONST);
+	sch->padded = (char *)sch - (char *)p;
+
+	INIT_LIST_HEAD(&sch->list);
+	skb_queue_head_init(&sch->q);
+
+	if (handle == TC_H_INGRESS)
+		sch->flags |= TCQ_F_INGRESS;
+
+	sch->ops = ops;
+	sch->enqueue = ops->enqueue;
+	sch->dequeue = ops->dequeue;
+	sch->dev = dev;
+	dev_hold(dev);
+	atomic_set(&sch->refcnt, 1);
+	sch->stats_lock = &dev->queue_lock;
+	if (handle == 0) {
+		handle = qdisc_alloc_handle(dev);
+		err = -ENOMEM;
+		if (handle == 0)
+			goto err_out3;
+	}
+
+	if (handle == TC_H_INGRESS)
+                sch->handle =TC_H_MAKE(TC_H_INGRESS, 0);
+        else
+                sch->handle = handle;
+
+	if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS-1])) == 0) {
+		qdisc_lock_tree(dev);
+		list_add_tail(&sch->list, &dev->qdisc_list);
+		qdisc_unlock_tree(dev);
+
+#ifdef CONFIG_NET_ESTIMATOR
+		if (tca[TCA_RATE-1])
+			gen_new_estimator(&sch->bstats, &sch->rate_est,
+				sch->stats_lock, tca[TCA_RATE-1]);
+#endif
+		return sch;
+	}
+err_out3:
+	dev_put(dev);
+err_out2:
+	module_put(ops->owner);
+err_out:
+	*errp = err;
+	if (p)
+		kfree(p);
+	return NULL;
+}
+
+static int qdisc_change(struct Qdisc *sch, struct rtattr **tca)
+{
+	if (tca[TCA_OPTIONS-1]) {
+		int err;
+
+		if (sch->ops->change == NULL)
+			return -EINVAL;
+		err = sch->ops->change(sch, tca[TCA_OPTIONS-1]);
+		if (err)
+			return err;
+	}
+#ifdef CONFIG_NET_ESTIMATOR
+	if (tca[TCA_RATE-1])
+		gen_replace_estimator(&sch->bstats, &sch->rate_est,
+			sch->stats_lock, tca[TCA_RATE-1]);
+#endif
+	return 0;
+}
+
+struct check_loop_arg
+{
+	struct qdisc_walker 	w;
+	struct Qdisc		*p;
+	int			depth;
+};
+
+static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w);
+
+static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
+{
+	struct check_loop_arg	arg;
+
+	if (q->ops->cl_ops == NULL)
+		return 0;
+
+	arg.w.stop = arg.w.skip = arg.w.count = 0;
+	arg.w.fn = check_loop_fn;
+	arg.depth = depth;
+	arg.p = p;
+	q->ops->cl_ops->walk(q, &arg.w);
+	return arg.w.stop ? -ELOOP : 0;
+}
+
+static int
+check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
+{
+	struct Qdisc *leaf;
+	struct Qdisc_class_ops *cops = q->ops->cl_ops;
+	struct check_loop_arg *arg = (struct check_loop_arg *)w;
+
+	leaf = cops->leaf(q, cl);
+	if (leaf) {
+		if (leaf == arg->p || arg->depth > 7)
+			return -ELOOP;
+		return check_loop(leaf, arg->p, arg->depth + 1);
+	}
+	return 0;
+}
+
+/*
+ * Delete/get qdisc.
+ */
+
+static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
+{
+	struct tcmsg *tcm = NLMSG_DATA(n);
+	struct rtattr **tca = arg;
+	struct net_device *dev;
+	u32 clid = tcm->tcm_parent;
+	struct Qdisc *q = NULL;
+	struct Qdisc *p = NULL;
+	int err;
+
+	if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL)
+		return -ENODEV;
+
+	if (clid) {
+		if (clid != TC_H_ROOT) {
+			if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
+				if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL)
+					return -ENOENT;
+				q = qdisc_leaf(p, clid);
+			} else { /* ingress */
+				q = dev->qdisc_ingress;
+                        }
+		} else {
+			q = dev->qdisc_sleeping;
+		}
+		if (!q)
+			return -ENOENT;
+
+		if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
+			return -EINVAL;
+	} else {
+		if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL)
+			return -ENOENT;
+	}
+
+	if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id))
+		return -EINVAL;
+
+	if (n->nlmsg_type == RTM_DELQDISC) {
+		if (!clid)
+			return -EINVAL;
+		if (q->handle == 0)
+			return -ENOENT;
+		if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0)
+			return err;
+		if (q) {
+			qdisc_notify(skb, n, clid, q, NULL);
+			spin_lock_bh(&dev->queue_lock);
+			qdisc_destroy(q);
+			spin_unlock_bh(&dev->queue_lock);
+		}
+	} else {
+		qdisc_notify(skb, n, clid, NULL, q);
+	}
+	return 0;
+}
+
+/*
+   Create/change qdisc.
+ */
+
+static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
+{
+	struct tcmsg *tcm;
+	struct rtattr **tca;
+	struct net_device *dev;
+	u32 clid;
+	struct Qdisc *q, *p;
+	int err;
+
+replay:
+	/* Reinit, just in case something touches this. */
+	tcm = NLMSG_DATA(n);
+	tca = arg;
+	clid = tcm->tcm_parent;
+	q = p = NULL;
+
+	if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL)
+		return -ENODEV;
+
+	if (clid) {
+		if (clid != TC_H_ROOT) {
+			if (clid != TC_H_INGRESS) {
+				if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL)
+					return -ENOENT;
+				q = qdisc_leaf(p, clid);
+			} else { /*ingress */
+				q = dev->qdisc_ingress;
+			}
+		} else {
+			q = dev->qdisc_sleeping;
+		}
+
+		/* It may be default qdisc, ignore it */
+		if (q && q->handle == 0)
+			q = NULL;
+
+		if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
+			if (tcm->tcm_handle) {
+				if (q && !(n->nlmsg_flags&NLM_F_REPLACE))
+					return -EEXIST;
+				if (TC_H_MIN(tcm->tcm_handle))
+					return -EINVAL;
+				if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL)
+					goto create_n_graft;
+				if (n->nlmsg_flags&NLM_F_EXCL)
+					return -EEXIST;
+				if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id))
+					return -EINVAL;
+				if (q == p ||
+				    (p && check_loop(q, p, 0)))
+					return -ELOOP;
+				atomic_inc(&q->refcnt);
+				goto graft;
+			} else {
+				if (q == NULL)
+					goto create_n_graft;
+
+				/* This magic test requires explanation.
+				 *
+				 *   We know, that some child q is already
+				 *   attached to this parent and have choice:
+				 *   either to change it or to create/graft new one.
+				 *
+				 *   1. We are allowed to create/graft only
+				 *   if CREATE and REPLACE flags are set.
+				 *
+				 *   2. If EXCL is set, requestor wanted to say,
+				 *   that qdisc tcm_handle is not expected
+				 *   to exist, so that we choose create/graft too.
+				 *
+				 *   3. The last case is when no flags are set.
+				 *   Alas, it is sort of hole in API, we
+				 *   cannot decide what to do unambiguously.
+				 *   For now we select create/graft, if
+				 *   user gave KIND, which does not match existing.
+				 */
+				if ((n->nlmsg_flags&NLM_F_CREATE) &&
+				    (n->nlmsg_flags&NLM_F_REPLACE) &&
+				    ((n->nlmsg_flags&NLM_F_EXCL) ||
+				     (tca[TCA_KIND-1] &&
+				      rtattr_strcmp(tca[TCA_KIND-1], q->ops->id))))
+					goto create_n_graft;
+			}
+		}
+	} else {
+		if (!tcm->tcm_handle)
+			return -EINVAL;
+		q = qdisc_lookup(dev, tcm->tcm_handle);
+	}
+
+	/* Change qdisc parameters */
+	if (q == NULL)
+		return -ENOENT;
+	if (n->nlmsg_flags&NLM_F_EXCL)
+		return -EEXIST;
+	if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id))
+		return -EINVAL;
+	err = qdisc_change(q, tca);
+	if (err == 0)
+		qdisc_notify(skb, n, clid, NULL, q);
+	return err;
+
+create_n_graft:
+	if (!(n->nlmsg_flags&NLM_F_CREATE))
+		return -ENOENT;
+	if (clid == TC_H_INGRESS)
+		q = qdisc_create(dev, tcm->tcm_parent, tca, &err);
+        else
+		q = qdisc_create(dev, tcm->tcm_handle, tca, &err);
+	if (q == NULL) {
+		if (err == -EAGAIN)
+			goto replay;
+		return err;
+	}
+
+graft:
+	if (1) {
+		struct Qdisc *old_q = NULL;
+		err = qdisc_graft(dev, p, clid, q, &old_q);
+		if (err) {
+			if (q) {
+				spin_lock_bh(&dev->queue_lock);
+				qdisc_destroy(q);
+				spin_unlock_bh(&dev->queue_lock);
+			}
+			return err;
+		}
+		qdisc_notify(skb, n, clid, old_q, q);
+		if (old_q) {
+			spin_lock_bh(&dev->queue_lock);
+			qdisc_destroy(old_q);
+			spin_unlock_bh(&dev->queue_lock);
+		}
+	}
+	return 0;
+}
+
+static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
+			 u32 pid, u32 seq, unsigned flags, int event)
+{
+	struct tcmsg *tcm;
+	struct nlmsghdr  *nlh;
+	unsigned char	 *b = skb->tail;
+	struct gnet_dump d;
+
+	nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*tcm));
+	nlh->nlmsg_flags = flags;
+	tcm = NLMSG_DATA(nlh);
+	tcm->tcm_family = AF_UNSPEC;
+	tcm->tcm_ifindex = q->dev->ifindex;
+	tcm->tcm_parent = clid;
+	tcm->tcm_handle = q->handle;
+	tcm->tcm_info = atomic_read(&q->refcnt);
+	RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id);
+	if (q->ops->dump && q->ops->dump(q, skb) < 0)
+		goto rtattr_failure;
+	q->qstats.qlen = q->q.qlen;
+
+	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
+			TCA_XSTATS, q->stats_lock, &d) < 0)
+		goto rtattr_failure;
+
+	if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
+		goto rtattr_failure;
+
+	if (gnet_stats_copy_basic(&d, &q->bstats) < 0 ||
+#ifdef CONFIG_NET_ESTIMATOR
+	    gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
+#endif
+	    gnet_stats_copy_queue(&d, &q->qstats) < 0)
+		goto rtattr_failure;
+	
+	if (gnet_stats_finish_copy(&d) < 0)
+		goto rtattr_failure;
+	
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n,
+			u32 clid, struct Qdisc *old, struct Qdisc *new)
+{
+	struct sk_buff *skb;
+	u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (old && old->handle) {
+		if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0)
+			goto err_out;
+	}
+	if (new) {
+		if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
+			goto err_out;
+	}
+
+	if (skb->len)
+		return rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
+
+err_out:
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int idx, q_idx;
+	int s_idx, s_q_idx;
+	struct net_device *dev;
+	struct Qdisc *q;
+
+	s_idx = cb->args[0];
+	s_q_idx = q_idx = cb->args[1];
+	read_lock(&dev_base_lock);
+	for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
+		if (idx < s_idx)
+			continue;
+		if (idx > s_idx)
+			s_q_idx = 0;
+		read_lock_bh(&qdisc_tree_lock);
+		q_idx = 0;
+		list_for_each_entry(q, &dev->qdisc_list, list) {
+			if (q_idx < s_q_idx) {
+				q_idx++;
+				continue;
+			}
+			if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid,
+					  cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) {
+				read_unlock_bh(&qdisc_tree_lock);
+				goto done;
+			}
+			q_idx++;
+		}
+		read_unlock_bh(&qdisc_tree_lock);
+	}
+
+done:
+	read_unlock(&dev_base_lock);
+
+	cb->args[0] = idx;
+	cb->args[1] = q_idx;
+
+	return skb->len;
+}
+
+
+
+/************************************************
+ *	Traffic classes manipulation.		*
+ ************************************************/
+
+
+
+static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
+{
+	struct tcmsg *tcm = NLMSG_DATA(n);
+	struct rtattr **tca = arg;
+	struct net_device *dev;
+	struct Qdisc *q = NULL;
+	struct Qdisc_class_ops *cops;
+	unsigned long cl = 0;
+	unsigned long new_cl;
+	u32 pid = tcm->tcm_parent;
+	u32 clid = tcm->tcm_handle;
+	u32 qid = TC_H_MAJ(clid);
+	int err;
+
+	if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL)
+		return -ENODEV;
+
+	/*
+	   parent == TC_H_UNSPEC - unspecified parent.
+	   parent == TC_H_ROOT   - class is root, which has no parent.
+	   parent == X:0	 - parent is root class.
+	   parent == X:Y	 - parent is a node in hierarchy.
+	   parent == 0:Y	 - parent is X:Y, where X:0 is qdisc.
+
+	   handle == 0:0	 - generate handle from kernel pool.
+	   handle == 0:Y	 - class is X:Y, where X:0 is qdisc.
+	   handle == X:Y	 - clear.
+	   handle == X:0	 - root class.
+	 */
+
+	/* Step 1. Determine qdisc handle X:0 */
+
+	if (pid != TC_H_ROOT) {
+		u32 qid1 = TC_H_MAJ(pid);
+
+		if (qid && qid1) {
+			/* If both majors are known, they must be identical. */
+			if (qid != qid1)
+				return -EINVAL;
+		} else if (qid1) {
+			qid = qid1;
+		} else if (qid == 0)
+			qid = dev->qdisc_sleeping->handle;
+
+		/* Now qid is genuine qdisc handle consistent
+		   both with parent and child.
+
+		   TC_H_MAJ(pid) still may be unspecified, complete it now.
+		 */
+		if (pid)
+			pid = TC_H_MAKE(qid, pid);
+	} else {
+		if (qid == 0)
+			qid = dev->qdisc_sleeping->handle;
+	}
+
+	/* OK. Locate qdisc */
+	if ((q = qdisc_lookup(dev, qid)) == NULL) 
+		return -ENOENT;
+
+	/* An check that it supports classes */
+	cops = q->ops->cl_ops;
+	if (cops == NULL)
+		return -EINVAL;
+
+	/* Now try to get class */
+	if (clid == 0) {
+		if (pid == TC_H_ROOT)
+			clid = qid;
+	} else
+		clid = TC_H_MAKE(qid, clid);
+
+	if (clid)
+		cl = cops->get(q, clid);
+
+	if (cl == 0) {
+		err = -ENOENT;
+		if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE))
+			goto out;
+	} else {
+		switch (n->nlmsg_type) {
+		case RTM_NEWTCLASS:	
+			err = -EEXIST;
+			if (n->nlmsg_flags&NLM_F_EXCL)
+				goto out;
+			break;
+		case RTM_DELTCLASS:
+			err = cops->delete(q, cl);
+			if (err == 0)
+				tclass_notify(skb, n, q, cl, RTM_DELTCLASS);
+			goto out;
+		case RTM_GETTCLASS:
+			err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS);
+			goto out;
+		default:
+			err = -EINVAL;
+			goto out;
+		}
+	}
+
+	new_cl = cl;
+	err = cops->change(q, clid, pid, tca, &new_cl);
+	if (err == 0)
+		tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS);
+
+out:
+	if (cl)
+		cops->put(q, cl);
+
+	return err;
+}
+
+
+static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
+			  unsigned long cl,
+			  u32 pid, u32 seq, unsigned flags, int event)
+{
+	struct tcmsg *tcm;
+	struct nlmsghdr  *nlh;
+	unsigned char	 *b = skb->tail;
+	struct gnet_dump d;
+	struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
+
+	nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*tcm));
+	nlh->nlmsg_flags = flags;
+	tcm = NLMSG_DATA(nlh);
+	tcm->tcm_family = AF_UNSPEC;
+	tcm->tcm_ifindex = q->dev->ifindex;
+	tcm->tcm_parent = q->handle;
+	tcm->tcm_handle = q->handle;
+	tcm->tcm_info = 0;
+	RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id);
+	if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
+		goto rtattr_failure;
+
+	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
+			TCA_XSTATS, q->stats_lock, &d) < 0)
+		goto rtattr_failure;
+
+	if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
+		goto rtattr_failure;
+
+	if (gnet_stats_finish_copy(&d) < 0)
+		goto rtattr_failure;
+
+	nlh->nlmsg_len = skb->tail - b;
+	return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+	skb_trim(skb, b - skb->data);
+	return -1;
+}
+
+static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n,
+			  struct Qdisc *q, unsigned long cl, int event)
+{
+	struct sk_buff *skb;
+	u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
+
+	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!skb)
+		return -ENOBUFS;
+
+	if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	return rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
+}
+
+struct qdisc_dump_args
+{
+	struct qdisc_walker w;
+	struct sk_buff *skb;
+	struct netlink_callback *cb;
+};
+
+static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg)
+{
+	struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
+
+	return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid,
+			      a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS);
+}
+
+static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int t;
+	int s_t;
+	struct net_device *dev;
+	struct Qdisc *q;
+	struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh);
+	struct qdisc_dump_args arg;
+
+	if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
+		return 0;
+	if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL)
+		return 0;
+
+	s_t = cb->args[0];
+	t = 0;
+
+	read_lock_bh(&qdisc_tree_lock);
+	list_for_each_entry(q, &dev->qdisc_list, list) {
+		if (t < s_t || !q->ops->cl_ops ||
+		    (tcm->tcm_parent &&
+		     TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
+			t++;
+			continue;
+		}
+		if (t > s_t)
+			memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
+		arg.w.fn = qdisc_class_dump;
+		arg.skb = skb;
+		arg.cb = cb;
+		arg.w.stop  = 0;
+		arg.w.skip = cb->args[1];
+		arg.w.count = 0;
+		q->ops->cl_ops->walk(q, &arg.w);
+		cb->args[1] = arg.w.count;
+		if (arg.w.stop)
+			break;
+		t++;
+	}
+	read_unlock_bh(&qdisc_tree_lock);
+
+	cb->args[0] = t;
+
+	dev_put(dev);
+	return skb->len;
+}
+
+/* Main classifier routine: scans classifier chain attached
+   to this qdisc, (optionally) tests for protocol and asks
+   specific classifiers.
+ */
+int tc_classify(struct sk_buff *skb, struct tcf_proto *tp,
+	struct tcf_result *res)
+{
+	int err = 0;
+	u32 protocol = skb->protocol;
+#ifdef CONFIG_NET_CLS_ACT
+	struct tcf_proto *otp = tp;
+reclassify:
+#endif
+	protocol = skb->protocol;
+
+	for ( ; tp; tp = tp->next) {
+		if ((tp->protocol == protocol ||
+			tp->protocol == __constant_htons(ETH_P_ALL)) &&
+			(err = tp->classify(skb, tp, res)) >= 0) {
+#ifdef CONFIG_NET_CLS_ACT
+			if ( TC_ACT_RECLASSIFY == err) {
+				__u32 verd = (__u32) G_TC_VERD(skb->tc_verd);
+				tp = otp;
+
+				if (MAX_REC_LOOP < verd++) {
+					printk("rule prio %d protocol %02x reclassify is buggy packet dropped\n",
+						tp->prio&0xffff, ntohs(tp->protocol));
+					return TC_ACT_SHOT;
+				}
+				skb->tc_verd = SET_TC_VERD(skb->tc_verd,verd);
+				goto reclassify;
+			} else {
+				if (skb->tc_verd) 
+					skb->tc_verd = SET_TC_VERD(skb->tc_verd,0);
+				return err;
+			}
+#else
+
+			return err;
+#endif
+		}
+
+	}
+	return -1;
+}
+
+static int psched_us_per_tick = 1;
+static int psched_tick_per_us = 1;
+
+#ifdef CONFIG_PROC_FS
+static int psched_show(struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%08x %08x %08x %08x\n",
+		      psched_tick_per_us, psched_us_per_tick,
+		      1000000, HZ);
+
+	return 0;
+}
+
+static int psched_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, psched_show, PDE(inode)->data);
+}
+
+static struct file_operations psched_fops = {
+	.owner = THIS_MODULE,
+	.open = psched_open,
+	.read  = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};	
+#endif
+
+#ifdef CONFIG_NET_SCH_CLK_CPU
+psched_tdiff_t psched_clock_per_hz;
+int psched_clock_scale;
+EXPORT_SYMBOL(psched_clock_per_hz);
+EXPORT_SYMBOL(psched_clock_scale);
+
+psched_time_t psched_time_base;
+cycles_t psched_time_mark;
+EXPORT_SYMBOL(psched_time_mark);
+EXPORT_SYMBOL(psched_time_base);
+
+/*
+ * Periodically adjust psched_time_base to avoid overflow
+ * with 32-bit get_cycles(). Safe up to 4GHz CPU.
+ */
+static void psched_tick(unsigned long);
+static struct timer_list psched_timer = TIMER_INITIALIZER(psched_tick, 0, 0);
+
+static void psched_tick(unsigned long dummy)
+{
+	if (sizeof(cycles_t) == sizeof(u32)) {
+		psched_time_t dummy_stamp;
+		PSCHED_GET_TIME(dummy_stamp);
+		psched_timer.expires = jiffies + 1*HZ;
+		add_timer(&psched_timer);
+	}
+}
+
+int __init psched_calibrate_clock(void)
+{
+	psched_time_t stamp, stamp1;
+	struct timeval tv, tv1;
+	psched_tdiff_t delay;
+	long rdelay;
+	unsigned long stop;
+
+	psched_tick(0);
+	stop = jiffies + HZ/10;
+	PSCHED_GET_TIME(stamp);
+	do_gettimeofday(&tv);
+	while (time_before(jiffies, stop)) {
+		barrier();
+		cpu_relax();
+	}
+	PSCHED_GET_TIME(stamp1);
+	do_gettimeofday(&tv1);
+
+	delay = PSCHED_TDIFF(stamp1, stamp);
+	rdelay = tv1.tv_usec - tv.tv_usec;
+	rdelay += (tv1.tv_sec - tv.tv_sec)*1000000;
+	if (rdelay > delay)
+		return -1;
+	delay /= rdelay;
+	psched_tick_per_us = delay;
+	while ((delay>>=1) != 0)
+		psched_clock_scale++;
+	psched_us_per_tick = 1<<psched_clock_scale;
+	psched_clock_per_hz = (psched_tick_per_us*(1000000/HZ))>>psched_clock_scale;
+	return 0;
+}
+#endif
+
+static int __init pktsched_init(void)
+{
+	struct rtnetlink_link *link_p;
+
+#ifdef CONFIG_NET_SCH_CLK_CPU
+	if (psched_calibrate_clock() < 0)
+		return -1;
+#elif defined(CONFIG_NET_SCH_CLK_JIFFIES)
+	psched_tick_per_us = HZ<<PSCHED_JSCALE;
+	psched_us_per_tick = 1000000;
+#endif
+
+	link_p = rtnetlink_links[PF_UNSPEC];
+
+	/* Setup rtnetlink links. It is made here to avoid
+	   exporting large number of public symbols.
+	 */
+
+	if (link_p) {
+		link_p[RTM_NEWQDISC-RTM_BASE].doit = tc_modify_qdisc;
+		link_p[RTM_DELQDISC-RTM_BASE].doit = tc_get_qdisc;
+		link_p[RTM_GETQDISC-RTM_BASE].doit = tc_get_qdisc;
+		link_p[RTM_GETQDISC-RTM_BASE].dumpit = tc_dump_qdisc;
+		link_p[RTM_NEWTCLASS-RTM_BASE].doit = tc_ctl_tclass;
+		link_p[RTM_DELTCLASS-RTM_BASE].doit = tc_ctl_tclass;
+		link_p[RTM_GETTCLASS-RTM_BASE].doit = tc_ctl_tclass;
+		link_p[RTM_GETTCLASS-RTM_BASE].dumpit = tc_dump_tclass;
+	}
+
+	register_qdisc(&pfifo_qdisc_ops);
+	register_qdisc(&bfifo_qdisc_ops);
+	proc_net_fops_create("psched", 0, &psched_fops);
+
+	return 0;
+}
+
+subsys_initcall(pktsched_init);
+
+EXPORT_SYMBOL(qdisc_get_rtab);
+EXPORT_SYMBOL(qdisc_put_rtab);
+EXPORT_SYMBOL(register_qdisc);
+EXPORT_SYMBOL(unregister_qdisc);
+EXPORT_SYMBOL(tc_classify);