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/* net/atm/clip.c - RFC1577 Classical IP over ATM */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
#include <linux/config.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/kernel.h> /* for UINT_MAX */
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/wait.h>
#include <linux/timer.h>
#include <linux/if_arp.h> /* for some manifest constants */
#include <linux/notifier.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/atmclip.h>
#include <linux/atmarp.h>
#include <linux/ip.h> /* for net/route.h */
#include <linux/in.h> /* for struct sockaddr_in */
#include <linux/if.h> /* for IFF_UP */
#include <linux/inetdevice.h>
#include <linux/bitops.h>
#include <net/route.h> /* for struct rtable and routing */
#include <net/icmp.h> /* icmp_send */
#include <asm/param.h> /* for HZ */
#include <asm/byteorder.h> /* for htons etc. */
#include <asm/system.h> /* save/restore_flags */
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include "common.h"
#include "resources.h"
#include "ipcommon.h"
#include <net/atmclip.h>
#if 0
#define DPRINTK(format,args...) printk(format,##args)
#else
#define DPRINTK(format,args...)
#endif
struct net_device *clip_devs = NULL;
struct atm_vcc *atmarpd = NULL;
static struct timer_list idle_timer;
static int start_timer = 1;
static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
{
struct atmarp_ctrl *ctrl;
struct sk_buff *skb;
DPRINTK("to_atmarpd(%d)\n",type);
if (!atmarpd) return -EUNATCH;
skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
if (!skb) return -ENOMEM;
ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
ctrl->type = type;
ctrl->itf_num = itf;
ctrl->ip = ip;
atm_force_charge(atmarpd,skb->truesize);
skb_queue_tail(&atmarpd->recvq,skb);
wake_up(&atmarpd->sleep);
return 0;
}
static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
{
DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
entry->neigh);
clip_vcc->entry = entry;
clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
clip_vcc->next = entry->vccs;
entry->vccs = clip_vcc;
entry->neigh->used = jiffies;
}
static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
{
struct atmarp_entry *entry = clip_vcc->entry;
struct clip_vcc **walk;
if (!entry) {
printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
return;
}
entry->neigh->used = jiffies;
for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
if (*walk == clip_vcc) {
int error;
*walk = clip_vcc->next; /* atomic */
clip_vcc->entry = NULL;
if (clip_vcc->xoff)
netif_wake_queue(entry->neigh->dev);
if (entry->vccs) return;
entry->expires = jiffies-1;
/* force resolution or expiration */
error = neigh_update(entry->neigh,NULL,NUD_NONE,0,0);
if (error)
printk(KERN_CRIT "unlink_clip_vcc: "
"neigh_update failed with %d\n",error);
return;
}
printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
"0x%p)\n",entry,clip_vcc);
}
static void idle_timer_check(unsigned long dummy)
{
int i;
/*DPRINTK("idle_timer_check\n");*/
write_lock(&clip_tbl.lock);
for (i = 0; i <= NEIGH_HASHMASK; i++) {
struct neighbour **np;
for (np = &clip_tbl.hash_buckets[i]; *np;) {
struct neighbour *n = *np;
struct atmarp_entry *entry = NEIGH2ENTRY(n);
struct clip_vcc *clip_vcc;
for (clip_vcc = entry->vccs; clip_vcc;
clip_vcc = clip_vcc->next)
if (clip_vcc->idle_timeout &&
time_after(jiffies, clip_vcc->last_use+
clip_vcc->idle_timeout)) {
DPRINTK("releasing vcc %p->%p of "
"entry %p\n",clip_vcc,clip_vcc->vcc,
entry);
atm_async_release_vcc(clip_vcc->vcc,
-ETIMEDOUT);
}
if (entry->vccs ||
time_before(jiffies, entry->expires)) {
np = &n->next;
continue;
}
if (atomic_read(&n->refcnt) > 1) {
struct sk_buff *skb;
DPRINTK("destruction postponed with ref %d\n",
atomic_read(&n->refcnt));
while ((skb = skb_dequeue(&n->arp_queue)) !=
NULL)
dev_kfree_skb(skb);
np = &n->next;
continue;
}
*np = n->next;
DPRINTK("expired neigh %p\n",n);
n->dead = 1;
neigh_release(n);
}
}
mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
write_unlock(&clip_tbl.lock);
}
static int clip_arp_rcv(struct sk_buff *skb)
{
struct atm_vcc *vcc;
DPRINTK("clip_arp_rcv\n");
vcc = ATM_SKB(skb)->vcc;
if (!vcc || !atm_charge(vcc,skb->truesize)) {
dev_kfree_skb_any(skb);
return 0;
}
DPRINTK("pushing to %p\n",vcc);
DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
CLIP_VCC(vcc)->old_push(vcc,skb);
return 0;
}
void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
{
struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
DPRINTK("clip push\n");
if (!skb) {
DPRINTK("removing VCC %p\n",clip_vcc);
if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
kfree(clip_vcc);
return;
}
atm_return(vcc,skb->truesize);
skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
/* clip_vcc->entry == NULL if we don't have an IP address yet */
if (!skb->dev) {
dev_kfree_skb_any(skb);
return;
}
ATM_SKB(skb)->vcc = vcc;
skb->mac.raw = skb->data;
if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
else {
skb->protocol = ((u16 *) skb->data)[3];
skb_pull(skb,RFC1483LLC_LEN);
if (skb->protocol == htons(ETH_P_ARP)) {
PRIV(skb->dev)->stats.rx_packets++;
PRIV(skb->dev)->stats.rx_bytes += skb->len;
clip_arp_rcv(skb);
return;
}
}
clip_vcc->last_use = jiffies;
PRIV(skb->dev)->stats.rx_packets++;
PRIV(skb->dev)->stats.rx_bytes += skb->len;
netif_rx(skb);
}
/*
* Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
* clip_pop is atomic with respect to the critical section in clip_start_xmit.
*/
static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
{
struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
struct net_device *dev = skb->dev;
int old;
unsigned long flags;
DPRINTK("clip_pop(vcc %p)\n",vcc);
clip_vcc->old_pop(vcc,skb);
/* skb->dev == NULL in outbound ARP packets */
if (!dev) return;
spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
if (atm_may_send(vcc,0)) {
old = xchg(&clip_vcc->xoff,0);
if (old) netif_wake_queue(dev);
}
spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
}
static void clip_neigh_destroy(struct neighbour *neigh)
{
DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
if (NEIGH2ENTRY(neigh)->vccs)
printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
}
static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
{
DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
}
static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
{
#ifndef CONFIG_ATM_CLIP_NO_ICMP
icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
#endif
kfree_skb(skb);
}
static struct neigh_ops clip_neigh_ops = {
family: AF_INET,
destructor: clip_neigh_destroy,
solicit: clip_neigh_solicit,
error_report: clip_neigh_error,
output: dev_queue_xmit,
connected_output: dev_queue_xmit,
hh_output: dev_queue_xmit,
queue_xmit: dev_queue_xmit,
};
static int clip_constructor(struct neighbour *neigh)
{
struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
struct net_device *dev = neigh->dev;
struct in_device *in_dev = dev->ip_ptr;
DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
if (!in_dev) return -EINVAL;
neigh->type = inet_addr_type(entry->ip);
if (neigh->type != RTN_UNICAST) return -EINVAL;
if (in_dev->arp_parms) neigh->parms = in_dev->arp_parms;
neigh->ops = &clip_neigh_ops;
neigh->output = neigh->nud_state & NUD_VALID ?
neigh->ops->connected_output : neigh->ops->output;
entry->neigh = neigh;
entry->vccs = NULL;
entry->expires = jiffies-1;
return 0;
}
static u32 clip_hash(const void *pkey, const struct net_device *dev)
{
u32 hash_val;
hash_val = *(u32*)pkey;
hash_val ^= (hash_val>>16);
hash_val ^= hash_val>>8;
hash_val ^= hash_val>>3;
hash_val = (hash_val^dev->ifindex)&NEIGH_HASHMASK;
return hash_val;
}
struct neigh_table clip_tbl = {
NULL, /* next */
AF_INET, /* family */
sizeof(struct neighbour)+sizeof(struct atmarp_entry), /* entry_size */
4, /* key_len */
clip_hash,
clip_constructor, /* constructor */
NULL, /* pconstructor */
NULL, /* pdestructor */
NULL, /* proxy_redo */
"clip_arp_cache",
{ /* neigh_parms */
NULL, /* next */
NULL, /* neigh_setup */
&clip_tbl, /* tbl */
0, /* entries */
NULL, /* priv */
NULL, /* sysctl_table */
30*HZ, /* base_reachable_time */
1*HZ, /* retrans_time */
60*HZ, /* gc_staletime */
30*HZ, /* reachable_time */
5*HZ, /* delay_probe_time */
3, /* queue_len */
3, /* ucast_probes */
0, /* app_probes */
3, /* mcast_probes */
1*HZ, /* anycast_delay */
(8*HZ)/10, /* proxy_delay */
1*HZ, /* proxy_qlen */
64 /* locktime */
},
30*HZ,128,512,1024 /* copied from ARP ... */
};
/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
/*
* We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
* to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
* don't increment the usage count. This is used to create entries in
* clip_setentry.
*/
int clip_encap(struct atm_vcc *vcc,int mode)
{
CLIP_VCC(vcc)->encap = mode;
return 0;
}
static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
{
struct clip_priv *clip_priv = PRIV(dev);
struct atmarp_entry *entry;
struct atm_vcc *vcc;
int old;
unsigned long flags;
DPRINTK("clip_start_xmit (skb %p)\n",skb);
if (!skb->dst) {
printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
dev_kfree_skb(skb);
clip_priv->stats.tx_dropped++;
return 0;
}
if (!skb->dst->neighbour) {
#if 0
skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
if (!skb->dst->neighbour) {
dev_kfree_skb(skb); /* lost that one */
clip_priv->stats.tx_dropped++;
return 0;
}
#endif
printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
dev_kfree_skb(skb);
clip_priv->stats.tx_dropped++;
return 0;
}
entry = NEIGH2ENTRY(skb->dst->neighbour);
if (!entry->vccs) {
if (time_after(jiffies, entry->expires)) {
/* should be resolved */
entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
}
if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
skb_queue_tail(&entry->neigh->arp_queue,skb);
else {
dev_kfree_skb(skb);
clip_priv->stats.tx_dropped++;
}
return 0;
}
DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
if (entry->vccs->encap) {
void *here;
here = skb_push(skb,RFC1483LLC_LEN);
memcpy(here,llc_oui,sizeof(llc_oui));
((u16 *) here)[3] = skb->protocol;
}
atomic_add(skb->truesize,&vcc->tx_inuse);
ATM_SKB(skb)->iovcnt = 0;
ATM_SKB(skb)->atm_options = vcc->atm_options;
entry->vccs->last_use = jiffies;
DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
if (old) {
printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
return 0;
}
clip_priv->stats.tx_packets++;
clip_priv->stats.tx_bytes += skb->len;
(void) vcc->send(vcc,skb);
if (atm_may_send(vcc,0)) {
entry->vccs->xoff = 0;
return 0;
}
spin_lock_irqsave(&clip_priv->xoff_lock,flags);
netif_stop_queue(dev); /* XOFF -> throttle immediately */
barrier();
if (!entry->vccs->xoff)
netif_start_queue(dev);
/* Oh, we just raced with clip_pop. netif_start_queue should be
good enough, because nothing should really be asleep because
of the brief netif_stop_queue. If this isn't true or if it
changes, use netif_wake_queue instead. */
spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
return 0;
}
static struct net_device_stats *clip_get_stats(struct net_device *dev)
{
return &PRIV(dev)->stats;
}
int clip_mkip(struct atm_vcc *vcc,int timeout)
{
struct clip_vcc *clip_vcc;
struct sk_buff_head copy;
struct sk_buff *skb;
if (!vcc->push) return -EBADFD;
clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
if (!clip_vcc) return -ENOMEM;
DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
clip_vcc->vcc = vcc;
vcc->user_back = clip_vcc;
clip_vcc->entry = NULL;
clip_vcc->xoff = 0;
clip_vcc->encap = 1;
clip_vcc->last_use = jiffies;
clip_vcc->idle_timeout = timeout*HZ;
clip_vcc->old_push = vcc->push;
clip_vcc->old_pop = vcc->pop;
vcc->push = clip_push;
vcc->pop = clip_pop;
skb_queue_head_init(©);
skb_migrate(&vcc->recvq,©);
/* re-process everything received between connection setup and MKIP */
while ((skb = skb_dequeue(©)))
if (!clip_devs) {
atm_return(vcc,skb->truesize);
kfree_skb(skb);
}
else {
unsigned int len = skb->len;
clip_push(vcc,skb);
PRIV(skb->dev)->stats.rx_packets--;
PRIV(skb->dev)->stats.rx_bytes -= len;
}
return 0;
}
int clip_setentry(struct atm_vcc *vcc,u32 ip)
{
struct neighbour *neigh;
struct atmarp_entry *entry;
int error;
struct clip_vcc *clip_vcc;
struct rtable *rt;
if (vcc->push != clip_push) {
printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
return -EBADF;
}
clip_vcc = CLIP_VCC(vcc);
if (!ip) {
if (!clip_vcc->entry) {
printk(KERN_ERR "hiding hidden ATMARP entry\n");
return 0;
}
DPRINTK("setentry: remove\n");
unlink_clip_vcc(clip_vcc);
return 0;
}
error = ip_route_output(&rt,ip,0,1,0);
if (error) return error;
neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
ip_rt_put(rt);
if (!neigh)
return -ENOMEM;
entry = NEIGH2ENTRY(neigh);
if (entry != clip_vcc->entry) {
if (!clip_vcc->entry) DPRINTK("setentry: add\n");
else {
DPRINTK("setentry: update\n");
unlink_clip_vcc(clip_vcc);
}
link_vcc(clip_vcc,entry);
}
error = neigh_update(neigh,llc_oui,NUD_PERMANENT,1,0);
neigh_release(neigh);
return error;
}
static int clip_init(struct net_device *dev)
{
DPRINTK("clip_init %s\n",dev->name);
dev->hard_start_xmit = clip_start_xmit;
/* sg_xmit ... */
dev->hard_header = NULL;
dev->rebuild_header = NULL;
dev->set_mac_address = NULL;
dev->hard_header_parse = NULL;
dev->hard_header_cache = NULL;
dev->header_cache_update = NULL;
dev->change_mtu = NULL;
dev->do_ioctl = NULL;
dev->get_stats = clip_get_stats;
dev->type = ARPHRD_ATM;
dev->hard_header_len = RFC1483LLC_LEN;
dev->mtu = RFC1626_MTU;
dev->addr_len = 0;
dev->tx_queue_len = 100; /* "normal" queue (packets) */
/* When using a "real" qdisc, the qdisc determines the queue */
/* length. tx_queue_len is only used for the default case, */
/* without any more elaborate queuing. 100 is a reasonable */
/* compromise between decent burst-tolerance and protection */
/* against memory hogs. */
dev->flags = 0;
return 0;
}
int clip_create(int number)
{
struct net_device *dev;
struct clip_priv *clip_priv;
int error;
if (number != -1) {
for (dev = clip_devs; dev; dev = PRIV(dev)->next)
if (PRIV(dev)->number == number) return -EEXIST;
}
else {
number = 0;
for (dev = clip_devs; dev; dev = PRIV(dev)->next)
if (PRIV(dev)->number >= number)
number = PRIV(dev)->number+1;
}
dev = kmalloc(sizeof(struct net_device)+sizeof(struct clip_priv),
GFP_KERNEL);
if (!dev) return -ENOMEM;
memset(dev,0,sizeof(struct net_device)+sizeof(struct clip_priv));
clip_priv = PRIV(dev);
sprintf(dev->name,"atm%d",number);
dev->init = clip_init;
spin_lock_init(&clip_priv->xoff_lock);
clip_priv->number = number;
error = register_netdev(dev);
if (error) {
kfree(dev);
return error;
}
clip_priv->next = clip_devs;
clip_devs = dev;
DPRINTK("registered (net:%s)\n",dev->name);
return number;
}
static int clip_device_event(struct notifier_block *this,unsigned long event,
void *dev)
{
/* ignore non-CLIP devices */
if (((struct net_device *) dev)->type != ARPHRD_ATM ||
((struct net_device *) dev)->init != clip_init)
return NOTIFY_DONE;
switch (event) {
case NETDEV_UP:
DPRINTK("clip_device_event NETDEV_UP\n");
(void) to_atmarpd(act_up,PRIV(dev)->number,0);
break;
case NETDEV_GOING_DOWN:
DPRINTK("clip_device_event NETDEV_DOWN\n");
(void) to_atmarpd(act_down,PRIV(dev)->number,0);
break;
case NETDEV_CHANGE:
case NETDEV_CHANGEMTU:
DPRINTK("clip_device_event NETDEV_CHANGE*\n");
(void) to_atmarpd(act_change,PRIV(dev)->number,0);
break;
case NETDEV_REBOOT:
case NETDEV_REGISTER:
case NETDEV_DOWN:
DPRINTK("clip_device_event %ld\n",event);
/* ignore */
break;
default:
printk(KERN_WARNING "clip_device_event: unknown event "
"%ld\n",event);
break;
}
return NOTIFY_DONE;
}
static int clip_inet_event(struct notifier_block *this,unsigned long event,
void *ifa)
{
struct in_device *in_dev;
in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
if (!in_dev || !in_dev->dev) {
printk(KERN_WARNING "clip_inet_event: no device\n");
return NOTIFY_DONE;
}
/*
* Transitions are of the down-change-up type, so it's sufficient to
* handle the change on up.
*/
if (event != NETDEV_UP) return NOTIFY_DONE;
return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
}
static struct notifier_block clip_dev_notifier = {
clip_device_event,
NULL,
0
};
static struct notifier_block clip_inet_notifier = {
clip_inet_event,
NULL,
0
};
static void atmarpd_close(struct atm_vcc *vcc)
{
DPRINTK("atmarpd_close\n");
atmarpd = NULL; /* assumed to be atomic */
barrier();
unregister_inetaddr_notifier(&clip_inet_notifier);
unregister_netdevice_notifier(&clip_dev_notifier);
if (skb_peek(&vcc->recvq))
printk(KERN_ERR "atmarpd_close: closing with requests "
"pending\n");
skb_queue_purge(&vcc->recvq);
DPRINTK("(done)\n");
}
static struct atmdev_ops atmarpd_dev_ops = {
close: atmarpd_close,
};
static struct atm_dev atmarpd_dev = {
&atmarpd_dev_ops,
NULL, /* no PHY */
"arpd", /* type */
999, /* dummy device number */
NULL,NULL, /* pretend not to have any VCCs */
NULL,NULL, /* no data */
{ 0 }, /* no flags */
NULL, /* no local address */
{ 0 } /* no ESI, no statistics */
};
int atm_init_atmarp(struct atm_vcc *vcc)
{
struct net_device *dev;
if (atmarpd) return -EADDRINUSE;
if (start_timer) {
start_timer = 0;
init_timer(&idle_timer);
idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
idle_timer.function = idle_timer_check;
add_timer(&idle_timer);
}
atmarpd = vcc;
set_bit(ATM_VF_META,&vcc->flags);
set_bit(ATM_VF_READY,&vcc->flags);
/* allow replies and avoid getting closed if signaling dies */
bind_vcc(vcc,&atmarpd_dev);
vcc->push = NULL;
vcc->pop = NULL; /* crash */
vcc->push_oam = NULL; /* crash */
if (register_netdevice_notifier(&clip_dev_notifier))
printk(KERN_ERR "register_netdevice_notifier failed\n");
if (register_inetaddr_notifier(&clip_inet_notifier))
printk(KERN_ERR "register_inetaddr_notifier failed\n");
for (dev = clip_devs; dev; dev = PRIV(dev)->next)
if (dev->flags & IFF_UP)
(void) to_atmarpd(act_up,PRIV(dev)->number,0);
return 0;
}
void atm_clip_init(void)
{
clip_tbl.lock = RW_LOCK_UNLOCKED;
clip_tbl.kmem_cachep = kmem_cache_create(clip_tbl.id,
clip_tbl.entry_size, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
}
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