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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sched/sch_atm.c
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!
Diffstat (limited to 'net/sched/sch_atm.c')
-rw-r--r--net/sched/sch_atm.c735
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");