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