static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
{
uint32_t dst_ip = msg->content.in_info.in_dst_ip;
in_cache_entry *entry;
entry = mpc->in_ops->get(dst_ip, mpc);
if(entry == NULL){
entry = mpc->in_ops->add_entry(dst_ip, mpc);
entry->entry_state = INGRESS_RESOLVING;
msg->type = SND_MPOA_RES_RQST;
msg->content.in_info = entry->ctrl_info;
msg_to_mpoad(msg, mpc);
do_gettimeofday(&(entry->reply_wait));
mpc->in_ops->put(entry);
return;
}
if(entry->entry_state == INGRESS_INVALID){
entry->entry_state = INGRESS_RESOLVING;
msg->type = SND_MPOA_RES_RQST;
msg->content.in_info = entry->ctrl_info;
msg_to_mpoad(msg, mpc);
do_gettimeofday(&(entry->reply_wait));
mpc->in_ops->put(entry);
return;
}
printk("mpoa: (%s) MPOA_trigger_rcvd: entry already in resolving state\n",
(mpc->dev) ? mpc->dev->name : "<unknown>");
mpc->in_ops->put(entry);
return;
}
/*
* Things get complicated because we have to check if there's an egress
* shortcut with suitable traffic parameters we could use.
*/
static void check_qos_and_open_shortcut(struct k_message *msg, struct mpoa_client *client, in_cache_entry *entry)
{
uint32_t dst_ip = msg->content.in_info.in_dst_ip;
struct atm_mpoa_qos *qos = atm_mpoa_search_qos(dst_ip);
eg_cache_entry *eg_entry = client->eg_ops->get_by_src_ip(dst_ip, client);
if(eg_entry && eg_entry->shortcut){
if(eg_entry->shortcut->qos.txtp.traffic_class &
msg->qos.txtp.traffic_class &
(qos ? qos->qos.txtp.traffic_class : ATM_UBR | ATM_CBR)){
if(eg_entry->shortcut->qos.txtp.traffic_class == ATM_UBR)
entry->shortcut = eg_entry->shortcut;
else if(eg_entry->shortcut->qos.txtp.max_pcr > 0)
entry->shortcut = eg_entry->shortcut;
}
if(entry->shortcut){
dprintk("mpoa: (%s) using egress SVC to reach %u.%u.%u.%u\n",client->dev->name, NIPQUAD(dst_ip));
client->eg_ops->put(eg_entry);
return;
}
}
if (eg_entry != NULL)
client->eg_ops->put(eg_entry);
/* No luck in the egress cache we must open an ingress SVC */
msg->type = OPEN_INGRESS_SVC;
if (qos && (qos->qos.txtp.traffic_class == msg->qos.txtp.traffic_class))
{
msg->qos = qos->qos;
printk("mpoa: (%s) trying to get a CBR shortcut\n",client->dev->name);
}
else memset(&msg->qos,0,sizeof(struct atm_qos));
msg_to_mpoad(msg, client);
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;
}
/*
* 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 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) {
dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
mpc->dev->name, &entry->ctrl_info.in_dst_ip);
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 send_set_mps_ctrl_addr(const char *addr, struct mpoa_client *mpc)
{
struct k_message mesg;
memcpy(mpc->mps_ctrl_addr, addr, ATM_ESA_LEN);
mesg.type = SET_MPS_CTRL_ADDR;
memcpy(mesg.MPS_ctrl, addr, ATM_ESA_LEN);
msg_to_mpoad(&mesg, mpc);
}
/*
* purge egress cache and tell daemon to 'action' (DIE, RELOAD)
*/
static void clean_up(struct k_message *msg, struct mpoa_client *mpc, int action)
{
eg_cache_entry *entry;
msg->type = SND_EGRESS_PURGE;
/* FIXME: This knows too much of the cache structure */
read_lock_irq(&mpc->egress_lock);
entry = mpc->eg_cache;
while (entry != NULL) {
msg->content.eg_info = entry->ctrl_info;
dprintk("cache_id %u\n", entry->ctrl_info.cache_id);
msg_to_mpoad(msg, mpc);
entry = entry->next;
}
read_unlock_irq(&mpc->egress_lock);
msg->type = action;
msg_to_mpoad(msg, mpc);
}
/* 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);
/*
* Retry time maximum exceeded,
* put entry in hold down.
*/
if (entry->retry_time > client->parameters.mpc_p5) {
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);
}