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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/atm/mpoa_caches.c
downloadlinux-2.6.38-lt-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/atm/mpoa_caches.c')
-rw-r--r--net/atm/mpoa_caches.c576
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 00000000000..64ddebb6406
--- /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;
+}