Viewing file:  mpoa_caches.c (15.22 KB) -rw-r--r--
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#include <linux/types.h>
#include <linux/atmmpc.h>
#include <linux/time.h>
#include "mpoa_caches.h"
#include "mpc.h"
/*
* mpoa_caches.c: Implementation of ingress and egress cache
* handling functions
*/
#if 0
#define dprintk printk /* debug */
#else
#define dprintk(format,args...)
#endif
#if 0
#define ddprintk printk /* more debug */
#else
#define ddprintk(format,args...)
#endif
static in_cache_entry *in_cache_get(uint32_t dst_ip,
struct mpoa_client *client)
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while(entry != NULL){
if( entry->ctrl_info.in_dst_ip == dst_ip ){
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
static in_cache_entry *in_cache_get_with_mask(uint32_t dst_ip,
struct mpoa_client *client,
uint32_t mask)
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while(entry != NULL){
if((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask )){
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
struct mpoa_client *client )
{
in_cache_entry *entry;
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while(entry != NULL){
if(entry->shortcut == vcc) {
atomic_inc(&entry->use);
read_unlock_bh(&client->ingress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
return NULL;
}
static in_cache_entry *in_cache_add_entry(uint32_t dst_ip,
struct mpoa_client *client)
{
unsigned char *ip __attribute__ ((unused)) = (unsigned char *)&dst_ip;
in_cache_entry* entry = kmalloc(sizeof(in_cache_entry), GFP_KERNEL);
if (entry == NULL) {
printk("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
return NULL;
}
dprintk("mpoa: mpoa_caches.c: adding an ingress entry, ip = %u.%u.%u.%u\n", ip[0], ip[1], ip[2], ip[3]);
memset(entry,0,sizeof(in_cache_entry));
atomic_set(&entry->use, 1);
dprintk("mpoa: mpoa_caches.c: new_in_cache_entry: about to lock\n");
write_lock_bh(&client->ingress_lock);
entry->next = client->in_cache;
entry->prev = NULL;
if (client->in_cache != NULL)
client->in_cache->prev = entry;
client->in_cache = entry;
memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
entry->ctrl_info.in_dst_ip = dst_ip;
do_gettimeofday(&(entry->tv));
entry->retry_time = client->parameters.mpc_p4;
entry->count = 1;
entry->entry_state = INGRESS_INVALID;
entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
atomic_inc(&entry->use);
write_unlock_bh(&client->ingress_lock);
dprintk("mpoa: mpoa_caches.c: new_in_cache_entry: unlocked\n");
return entry;
}
static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
{
struct atm_mpoa_qos *qos;
struct k_message msg;
entry->count++;
if(entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
return OPEN;
if(entry->entry_state == INGRESS_REFRESHING){
if(entry->count > mpc->parameters.mpc_p1){
msg.type = SND_MPOA_RES_RQST;
msg.content.in_info = entry->ctrl_info;
memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
if (qos != NULL) msg.qos = qos->qos;
msg_to_mpoad(&msg, mpc);
do_gettimeofday(&(entry->reply_wait));
entry->entry_state = INGRESS_RESOLVING;
}
if(entry->shortcut != NULL)
return OPEN;
return CLOSED;
}
if(entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
return OPEN;
if( entry->count > mpc->parameters.mpc_p1 &&
entry->entry_state == INGRESS_INVALID){
unsigned char *ip __attribute__ ((unused)) =
(unsigned char *)&entry->ctrl_info.in_dst_ip;
dprintk("mpoa: (%s) mpoa_caches.c: threshold exceeded for ip %u.%u.%u.%u, sending MPOA res req\n", mpc->dev->name, ip[0], ip[1], ip[2], ip[3]);
entry->entry_state = INGRESS_RESOLVING;
msg.type = SND_MPOA_RES_RQST;
memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN );
msg.content.in_info = entry->ctrl_info;
qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
if (qos != NULL) msg.qos = qos->qos;
msg_to_mpoad( &msg, mpc);
do_gettimeofday(&(entry->reply_wait));
}
return CLOSED;
}
static void in_cache_put(in_cache_entry *entry)
{
if (atomic_dec_and_test(&entry->use)) {
memset(entry, 0, sizeof(in_cache_entry));
kfree(entry);
}
return;
}
/*
* This should be called with write lock on
*/
static void in_cache_remove_entry(in_cache_entry *entry,
struct mpoa_client *client)
{
struct atm_vcc *vcc;
struct k_message msg;
unsigned char *ip;
vcc = entry->shortcut;
ip = (unsigned char *)&entry->ctrl_info.in_dst_ip;
dprintk("mpoa: mpoa_caches.c: removing an ingress entry, ip = %u.%u.%u.%u\n",ip[0], ip[1], ip[2], ip[3]);
if (entry->prev != NULL)
entry->prev->next = entry->next;
else
client->in_cache = entry->next;
if (entry->next != NULL)
entry->next->prev = entry->prev;
client->in_ops->put(entry);
if(client->in_cache == NULL && client->eg_cache == NULL){
msg.type = STOP_KEEP_ALIVE_SM;
msg_to_mpoad(&msg,client);
}
/* Check if the egress side still uses this VCC */
if (vcc != NULL) {
eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc, client);
if (eg_entry != NULL) {
client->eg_ops->put(eg_entry);
return;
}
atm_async_release_vcc(vcc, -EPIPE);
}
return;
}
/* Call this every MPC-p2 seconds... Not exactly correct solution,
but an easy one... */
static void clear_count_and_expired(struct mpoa_client *client)
{
unsigned char *ip;
in_cache_entry *entry, *next_entry;
struct timeval now;
do_gettimeofday(&now);
write_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while(entry != NULL){
entry->count=0;
next_entry = entry->next;
if((now.tv_sec - entry->tv.tv_sec)
> entry->ctrl_info.holding_time){
ip = (unsigned char*)&entry->ctrl_info.in_dst_ip;
dprintk("mpoa: mpoa_caches.c: holding time expired, ip = %u.%u.%u.%u\n", NIPQUAD(ip));
client->in_ops->remove_entry(entry, client);
}
entry = next_entry;
}
write_unlock_bh(&client->ingress_lock);
return;
}
/* Call this every MPC-p4 seconds. */
static void check_resolving_entries(struct mpoa_client *client)
{
struct atm_mpoa_qos *qos;
in_cache_entry *entry;
struct timeval now;
struct k_message msg;
do_gettimeofday( &now );
read_lock_bh(&client->ingress_lock);
entry = client->in_cache;
while( entry != NULL ){
if(entry->entry_state == INGRESS_RESOLVING){
if(now.tv_sec - entry->hold_down.tv_sec < client->parameters.mpc_p6){
entry = entry->next; /* Entry in hold down */
continue;
}
if( (now.tv_sec - entry->reply_wait.tv_sec) >
entry->retry_time ){
entry->retry_time = MPC_C1*( entry->retry_time );
if(entry->retry_time > client->parameters.mpc_p5){
/* Retry time maximum exceeded, put entry in hold down. */
do_gettimeofday(&(entry->hold_down));
entry->retry_time = client->parameters.mpc_p4;
entry = entry->next;
continue;
}
/* Ask daemon to send a resolution request. */
memset(&(entry->hold_down),0,sizeof(struct timeval));
msg.type = SND_MPOA_RES_RTRY;
memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
msg.content.in_info = entry->ctrl_info;
qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
if (qos != NULL) msg.qos = qos->qos;
msg_to_mpoad(&msg, client);
do_gettimeofday(&(entry->reply_wait));
}
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
}
/* Call this every MPC-p5 seconds. */
static void refresh_entries(struct mpoa_client *client)
{
struct timeval now;
struct in_cache_entry *entry = client->in_cache;
ddprintk("mpoa: mpoa_caches.c: refresh_entries\n");
do_gettimeofday(&now);
read_lock_bh(&client->ingress_lock);
while( entry != NULL ){
if( entry->entry_state == INGRESS_RESOLVED ){
if(!(entry->refresh_time))
entry->refresh_time = (2*(entry->ctrl_info.holding_time))/3;
if( (now.tv_sec - entry->reply_wait.tv_sec) > entry->refresh_time ){
dprintk("mpoa: mpoa_caches.c: refreshing an entry.\n");
entry->entry_state = INGRESS_REFRESHING;
}
}
entry = entry->next;
}
read_unlock_bh(&client->ingress_lock);
}
static void in_destroy_cache(struct mpoa_client *mpc)
{
write_lock_irq(&mpc->ingress_lock);
while(mpc->in_cache != NULL)
mpc->in_ops->remove_entry(mpc->in_cache, mpc);
write_unlock_irq(&mpc->ingress_lock);
return;
}
static eg_cache_entry *eg_cache_get_by_cache_id(uint32_t cache_id, struct mpoa_client *mpc)
{
eg_cache_entry *entry;
read_lock_irq(&mpc->egress_lock);
entry = mpc->eg_cache;
while(entry != NULL){
if(entry->ctrl_info.cache_id == cache_id){
atomic_inc(&entry->use);
read_unlock_irq(&mpc->egress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_irq(&mpc->egress_lock);
return NULL;
}
/* This can be called from any context since it saves CPU flags */
static eg_cache_entry *eg_cache_get_by_tag(uint32_t tag, struct mpoa_client *mpc)
{
unsigned long flags;
eg_cache_entry *entry;
read_lock_irqsave(&mpc->egress_lock, flags);
entry = mpc->eg_cache;
while (entry != NULL){
if (entry->ctrl_info.tag == tag) {
atomic_inc(&entry->use);
read_unlock_irqrestore(&mpc->egress_lock, flags);
return entry;
}
entry = entry->next;
}
read_unlock_irqrestore(&mpc->egress_lock, flags);
return NULL;
}
/* This can be called from any context since it saves CPU flags */
static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc, struct mpoa_client *mpc)
{
unsigned long flags;
eg_cache_entry *entry;
read_lock_irqsave(&mpc->egress_lock, flags);
entry = mpc->eg_cache;
while (entry != NULL){
if (entry->shortcut == vcc) {
atomic_inc(&entry->use);
read_unlock_irqrestore(&mpc->egress_lock, flags);
return entry;
}
entry = entry->next;
}
read_unlock_irqrestore(&mpc->egress_lock, flags);
return NULL;
}
static eg_cache_entry *eg_cache_get_by_src_ip(uint32_t ipaddr, struct mpoa_client *mpc)
{
eg_cache_entry *entry;
read_lock_irq(&mpc->egress_lock);
entry = mpc->eg_cache;
while(entry != NULL){
if(entry->latest_ip_addr == ipaddr) {
atomic_inc(&entry->use);
read_unlock_irq(&mpc->egress_lock);
return entry;
}
entry = entry->next;
}
read_unlock_irq(&mpc->egress_lock);
return NULL;
}
static void eg_cache_put(eg_cache_entry *entry)
{
if (atomic_dec_and_test(&entry->use)) {
memset(entry, 0, sizeof(eg_cache_entry));
kfree(entry);
}
return;
}
/*
* This should be called with write lock on
*/
static void eg_cache_remove_entry(eg_cache_entry *entry,
struct mpoa_client *client)
{
struct atm_vcc *vcc;
struct k_message msg;
vcc = entry->shortcut;
dprintk("mpoa: mpoa_caches.c: removing an egress entry.\n");
if (entry->prev != NULL)
entry->prev->next = entry->next;
else
client->eg_cache = entry->next;
if (entry->next != NULL)
entry->next->prev = entry->prev;
client->eg_ops->put(entry);
if(client->in_cache == NULL && client->eg_cache == NULL){
msg.type = STOP_KEEP_ALIVE_SM;
msg_to_mpoad(&msg,client);
}
/* Check if the ingress side still uses this VCC */
if (vcc != NULL) {
in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
if (in_entry != NULL) {
client->in_ops->put(in_entry);
return;
}
atm_async_release_vcc(vcc, -EPIPE);
}
return;
}
static eg_cache_entry *eg_cache_add_entry(struct k_message *msg, struct mpoa_client *client)
{
unsigned char *ip;
eg_cache_entry *entry = kmalloc(sizeof(eg_cache_entry), GFP_KERNEL);
if (entry == NULL) {
printk("mpoa: mpoa_caches.c: new_eg_cache_entry: out of memory\n");
return NULL;
}
ip = (unsigned char *)&msg->content.eg_info.eg_dst_ip;
dprintk("mpoa: mpoa_caches.c: adding an egress entry, ip = %u.%u.%u.%u, this should be our IP\n", NIPQUAD(ip));
memset(entry, 0, sizeof(eg_cache_entry));
atomic_set(&entry->use, 1);
dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry: about to lock\n");
write_lock_irq(&client->egress_lock);
entry->next = client->eg_cache;
entry->prev = NULL;
if (client->eg_cache != NULL)
client->eg_cache->prev = entry;
client->eg_cache = entry;
memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
entry->ctrl_info = msg->content.eg_info;
do_gettimeofday(&(entry->tv));
entry->entry_state = EGRESS_RESOLVED;
dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry cache_id %lu\n", ntohl(entry->ctrl_info.cache_id));
ip = (unsigned char *)&entry->ctrl_info.mps_ip;
dprintk("mpoa: mpoa_caches.c: mps_ip = %u.%u.%u.%u\n", NIPQUAD(ip));
atomic_inc(&entry->use);
write_unlock_irq(&client->egress_lock);
dprintk("mpoa: mpoa_caches.c: new_eg_cache_entry: unlocked\n");
return entry;
}
static void update_eg_cache_entry(eg_cache_entry * entry, uint16_t holding_time)
{
do_gettimeofday(&(entry->tv));
entry->entry_state = EGRESS_RESOLVED;
entry->ctrl_info.holding_time = holding_time;
return;
}
static void clear_expired(struct mpoa_client *client)
{
eg_cache_entry *entry, *next_entry;
struct timeval now;
struct k_message msg;
do_gettimeofday(&now);
write_lock_irq(&client->egress_lock);
entry = client->eg_cache;
while(entry != NULL){
next_entry = entry->next;
if((now.tv_sec - entry->tv.tv_sec)
> entry->ctrl_info.holding_time){
msg.type = SND_EGRESS_PURGE;
msg.content.eg_info = entry->ctrl_info;
dprintk("mpoa: mpoa_caches.c: egress_cache: holding time expired, cache_id = %lu.\n",ntohl(entry->ctrl_info.cache_id));
msg_to_mpoad(&msg, client);
client->eg_ops->remove_entry(entry, client);
}
entry = next_entry;
}
write_unlock_irq(&client->egress_lock);
return;
}
static void eg_destroy_cache(struct mpoa_client *mpc)
{
write_lock_irq(&mpc->egress_lock);
while(mpc->eg_cache != NULL)
mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
write_unlock_irq(&mpc->egress_lock);
return;
}
static struct in_cache_ops ingress_ops = {
in_cache_add_entry, /* add_entry */
in_cache_get, /* get */
in_cache_get_with_mask, /* get_with_mask */
in_cache_get_by_vcc, /* get_by_vcc */
in_cache_put, /* put */
in_cache_remove_entry, /* remove_entry */
cache_hit, /* cache_hit */
clear_count_and_expired, /* clear_count */
check_resolving_entries, /* check_resolving */
refresh_entries, /* refresh */
in_destroy_cache /* destroy_cache */
};
static struct eg_cache_ops egress_ops = {
eg_cache_add_entry, /* add_entry */
eg_cache_get_by_cache_id, /* get_by_cache_id */
eg_cache_get_by_tag, /* get_by_tag */
eg_cache_get_by_vcc, /* get_by_vcc */
eg_cache_get_by_src_ip, /* get_by_src_ip */
eg_cache_put, /* put */
eg_cache_remove_entry, /* remove_entry */
update_eg_cache_entry, /* update */
clear_expired, /* clear_expired */
eg_destroy_cache /* destroy_cache */
};
void atm_mpoa_init_cache(struct mpoa_client *mpc)
{
mpc->in_ops = &ingress_ops;
mpc->eg_ops = &egress_ops;
return;
}
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