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author | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2010-03-15 23:23:54 (GMT) |
commit | 4961e02f1999e1c3468c09b2669c94d7c3ae82a8 (patch) | |
tree | 44c15abb09d7ba5e17a9aba95ee246648b1c1a8a /drivers/staging/batman-adv/originator.c | |
parent | d14a0ebda7d3daede1a99c01527affb9ceaa4c22 (diff) | |
parent | a3d3203e4bb40f253b1541e310dc0f9305be7c84 (diff) | |
download | linux-fsl-qoriq-4961e02f1999e1c3468c09b2669c94d7c3ae82a8.tar.xz |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'drivers/staging/batman-adv/originator.c')
-rw-r--r-- | drivers/staging/batman-adv/originator.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/drivers/staging/batman-adv/originator.c b/drivers/staging/batman-adv/originator.c new file mode 100644 index 0000000..29c2411 --- /dev/null +++ b/drivers/staging/batman-adv/originator.c @@ -0,0 +1,252 @@ +/* + * Copyright (C) 2009 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA + * + */ + +/* increase the reference counter for this originator */ + +#include "main.h" +#include "originator.h" +#include "hash.h" +#include "translation-table.h" +#include "routing.h" + +static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig); + +static void start_purge_timer(void) +{ + queue_delayed_work(bat_event_workqueue, &purge_orig_wq, 1 * HZ); +} + +int originator_init(void) +{ + unsigned long flags; + if (orig_hash) + return 1; + + spin_lock_irqsave(&orig_hash_lock, flags); + orig_hash = hash_new(128, compare_orig, choose_orig); + + if (!orig_hash) + goto err; + + spin_unlock_irqrestore(&orig_hash_lock, flags); + start_purge_timer(); + return 1; + +err: + spin_unlock_irqrestore(&orig_hash_lock, flags); + return 0; +} + +void originator_free(void) +{ + unsigned long flags; + + if (!orig_hash) + return; + + cancel_delayed_work_sync(&purge_orig_wq); + + spin_lock_irqsave(&orig_hash_lock, flags); + hash_delete(orig_hash, free_orig_node); + orig_hash = NULL; + spin_unlock_irqrestore(&orig_hash_lock, flags); +} + +struct neigh_node * +create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node, + uint8_t *neigh, struct batman_if *if_incoming) +{ + struct neigh_node *neigh_node; + + bat_dbg(DBG_BATMAN, "Creating new last-hop neighbor of originator\n"); + + neigh_node = kzalloc(sizeof(struct neigh_node), GFP_ATOMIC); + if (!neigh_node) + return NULL; + + INIT_LIST_HEAD(&neigh_node->list); + + memcpy(neigh_node->addr, neigh, ETH_ALEN); + neigh_node->orig_node = orig_neigh_node; + neigh_node->if_incoming = if_incoming; + + list_add_tail(&neigh_node->list, &orig_node->neigh_list); + return neigh_node; +} + +void free_orig_node(void *data) +{ + struct list_head *list_pos, *list_pos_tmp; + struct neigh_node *neigh_node; + struct orig_node *orig_node = (struct orig_node *)data; + + /* for all neighbors towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + list_del(list_pos); + kfree(neigh_node); + } + + hna_global_del_orig(orig_node, "originator timed out"); + + kfree(orig_node->bcast_own); + kfree(orig_node->bcast_own_sum); + kfree(orig_node); +} + +/* this function finds or creates an originator entry for the given + * address if it does not exits */ +struct orig_node *get_orig_node(uint8_t *addr) +{ + struct orig_node *orig_node; + struct hashtable_t *swaphash; + int size; + + orig_node = ((struct orig_node *)hash_find(orig_hash, addr)); + + if (orig_node != NULL) + return orig_node; + + bat_dbg(DBG_BATMAN, "Creating new originator: %pM \n", addr); + + orig_node = kzalloc(sizeof(struct orig_node), GFP_ATOMIC); + if (!orig_node) + return NULL; + + INIT_LIST_HEAD(&orig_node->neigh_list); + + memcpy(orig_node->orig, addr, ETH_ALEN); + orig_node->router = NULL; + orig_node->batman_if = NULL; + orig_node->hna_buff = NULL; + + size = num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS; + + orig_node->bcast_own = kzalloc(size, GFP_ATOMIC); + if (!orig_node->bcast_own) + goto free_orig_node; + + size = num_ifs * sizeof(uint8_t); + orig_node->bcast_own_sum = kzalloc(size, GFP_ATOMIC); + if (!orig_node->bcast_own_sum) + goto free_bcast_own; + + if (hash_add(orig_hash, orig_node) < 0) + goto free_bcast_own_sum; + + if (orig_hash->elements * 4 > orig_hash->size) { + swaphash = hash_resize(orig_hash, orig_hash->size * 2); + + if (swaphash == NULL) + printk(KERN_ERR + "batman-adv:Couldn't resize orig hash table \n"); + else + orig_hash = swaphash; + } + + return orig_node; +free_bcast_own_sum: + kfree(orig_node->bcast_own_sum); +free_bcast_own: + kfree(orig_node->bcast_own); +free_orig_node: + kfree(orig_node); + return NULL; +} + +static bool purge_orig_neighbors(struct orig_node *orig_node, + struct neigh_node **best_neigh_node) +{ + struct list_head *list_pos, *list_pos_tmp; + struct neigh_node *neigh_node; + bool neigh_purged = false; + + *best_neigh_node = NULL; + + + /* for all neighbors towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + if (time_after(jiffies, + (neigh_node->last_valid + + ((PURGE_TIMEOUT * HZ) / 1000)))) { + + bat_dbg(DBG_BATMAN, "neighbor timeout: originator %pM, neighbor: %pM, last_valid %lu\n", orig_node->orig, neigh_node->addr, (neigh_node->last_valid / HZ)); + + neigh_purged = true; + list_del(list_pos); + kfree(neigh_node); + } else { + if ((*best_neigh_node == NULL) || + (neigh_node->tq_avg > (*best_neigh_node)->tq_avg)) + *best_neigh_node = neigh_node; + } + } + return neigh_purged; +} + + +static bool purge_orig_node(struct orig_node *orig_node) +{ + struct neigh_node *best_neigh_node; + + if (time_after(jiffies, + (orig_node->last_valid + + ((2 * PURGE_TIMEOUT * HZ) / 1000)))) { + + bat_dbg(DBG_BATMAN, + "Originator timeout: originator %pM, last_valid %lu\n", + orig_node->orig, (orig_node->last_valid / HZ)); + return true; + } else { + if (purge_orig_neighbors(orig_node, &best_neigh_node)) + update_routes(orig_node, best_neigh_node, + orig_node->hna_buff, + orig_node->hna_buff_len); + } + return false; +} + +void purge_orig(struct work_struct *work) +{ + HASHIT(hashit); + struct orig_node *orig_node; + unsigned long flags; + + spin_lock_irqsave(&orig_hash_lock, flags); + + /* for all origins... */ + while (hash_iterate(orig_hash, &hashit)) { + orig_node = hashit.bucket->data; + if (purge_orig_node(orig_node)) { + hash_remove_bucket(orig_hash, &hashit); + free_orig_node(orig_node); + } + } + + spin_unlock_irqrestore(&orig_hash_lock, flags); + + start_purge_timer(); +} + + |