1 files changed, 576 insertions, 0 deletions

diff --git a/net/atm/mpoa_caches.c b/net/atm/mpoa_caches.c
new file mode 100644
index 000000000000..64ddebb64060
--- /dev/null
+++ b/net/atm/mpoa_caches.c
@@ -0,0 +1,576 @@
+#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;
+                }
+                vcc_release_async(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;
+                }
+                vcc_release_async(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;
+}