diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/atm/mpoa_caches.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
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.c | 576 |
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; +} |