570 lines
15 KiB
C
570 lines
15 KiB
C
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#include <linux/types.h>
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#include <linux/atmmpc.h>
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#include <linux/slab.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(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define dprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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#if 0
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#define ddprintk(format, args...) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args) /* debug */
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#else
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#define ddprintk(format, args...) \
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do { if (0) \
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printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
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} while (0)
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#endif
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static in_cache_entry *in_cache_get(__be32 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(__be32 dst_ip,
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struct mpoa_client *client,
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__be32 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(__be32 dst_ip,
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struct mpoa_client *client)
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{
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in_cache_entry *entry = kzalloc(sizeof(in_cache_entry), GFP_KERNEL);
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if (entry == NULL) {
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pr_info("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("adding an ingress entry, ip = %pI4\n", &dst_ip);
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atomic_set(&entry->use, 1);
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dprintk("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("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)
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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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dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
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mpc->dev->name, &entry->ctrl_info.in_dst_ip);
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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)
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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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}
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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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vcc = entry->shortcut;
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dprintk("removing an ingress entry, ip = %pI4\n",
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&entry->ctrl_info.in_dst_ip);
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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,
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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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}
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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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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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dprintk("holding time expired, ip = %pI4\n",
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&entry->ctrl_info.in_dst_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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}
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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) <
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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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/*
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* Retry time maximum exceeded,
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* put entry in hold down.
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*/
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if (entry->retry_time > client->parameters.mpc_p5) {
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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)
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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("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) >
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entry->refresh_time) {
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dprintk("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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}
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static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
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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(__be32 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);
|
||
|
|
|
||
|
|
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(__be32 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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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("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;
|
||
|
|
}
|
||
|
|
vcc_release_async(vcc, -EPIPE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
|
||
|
|
struct mpoa_client *client)
|
||
|
|
{
|
||
|
|
eg_cache_entry *entry = kzalloc(sizeof(eg_cache_entry), GFP_KERNEL);
|
||
|
|
|
||
|
|
if (entry == NULL) {
|
||
|
|
pr_info("out of memory\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
|
||
|
|
&msg->content.eg_info.eg_dst_ip);
|
||
|
|
|
||
|
|
atomic_set(&entry->use, 1);
|
||
|
|
dprintk("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("new_eg_cache_entry cache_id %u\n",
|
||
|
|
ntohl(entry->ctrl_info.cache_id));
|
||
|
|
dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
|
||
|
|
atomic_inc(&entry->use);
|
||
|
|
|
||
|
|
write_unlock_irq(&client->egress_lock);
|
||
|
|
dprintk("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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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("egress_cache: holding time expired, cache_id = %u.\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);
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static const 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 const 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;
|
||
|
|
}
|