2 * net/tipc/name_distr.c: TIPC name distribution code
4 * Copyright (c) 2000-2006, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, Wind River Systems
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21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
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39 #include "name_distr.h"
42 * struct publ_list - list of publications made by this node
43 * @list: circular list of publications
44 * @list_size: number of entries in list
47 struct list_head list;
51 static struct publ_list publ_zone = {
52 .list = LIST_HEAD_INIT(publ_zone.list),
56 static struct publ_list publ_cluster = {
57 .list = LIST_HEAD_INIT(publ_cluster.list),
61 static struct publ_list publ_node = {
62 .list = LIST_HEAD_INIT(publ_node.list),
66 static struct publ_list *publ_lists[] = {
68 &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */
69 &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */
70 &publ_node /* publ_lists[TIPC_NODE_SCOPE] */
75 * publ_to_item - add publication info to a publication message
77 static void publ_to_item(struct distr_item *i, struct publication *p)
79 i->type = htonl(p->type);
80 i->lower = htonl(p->lower);
81 i->upper = htonl(p->upper);
82 i->ref = htonl(p->ref);
83 i->key = htonl(p->key);
87 * named_prepare_buf - allocate & initialize a publication message
89 static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
91 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size);
96 tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest);
97 msg_set_size(msg, INT_H_SIZE + size);
102 void named_cluster_distribute(struct sk_buff *buf)
104 struct sk_buff *buf_copy;
105 struct tipc_node *n_ptr;
106 struct tipc_link *l_ptr;
109 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
110 tipc_node_lock(n_ptr);
111 l_ptr = n_ptr->active_links[n_ptr->addr & 1];
113 buf_copy = skb_copy(buf, GFP_ATOMIC);
115 tipc_node_unlock(n_ptr);
118 msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
119 __tipc_link_xmit(l_ptr, buf_copy);
121 tipc_node_unlock(n_ptr);
129 * tipc_named_publish - tell other nodes about a new publication by this node
131 struct sk_buff *tipc_named_publish(struct publication *publ)
134 struct distr_item *item;
136 list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list);
137 publ_lists[publ->scope]->size++;
139 if (publ->scope == TIPC_NODE_SCOPE)
142 buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
144 pr_warn("Publication distribution failure\n");
148 item = (struct distr_item *)msg_data(buf_msg(buf));
149 publ_to_item(item, publ);
154 * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
156 struct sk_buff *tipc_named_withdraw(struct publication *publ)
159 struct distr_item *item;
161 list_del(&publ->local_list);
162 publ_lists[publ->scope]->size--;
164 if (publ->scope == TIPC_NODE_SCOPE)
167 buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
169 pr_warn("Withdrawal distribution failure\n");
173 item = (struct distr_item *)msg_data(buf_msg(buf));
174 publ_to_item(item, publ);
179 * named_distribute - prepare name info for bulk distribution to another node
181 static void named_distribute(struct list_head *message_list, u32 node,
182 struct publ_list *pls, u32 max_item_buf)
184 struct publication *publ;
185 struct sk_buff *buf = NULL;
186 struct distr_item *item = NULL;
188 u32 rest = pls->size * ITEM_SIZE;
190 list_for_each_entry(publ, &pls->list, local_list) {
192 left = (rest <= max_item_buf) ? rest : max_item_buf;
194 buf = named_prepare_buf(PUBLICATION, left, node);
196 pr_warn("Bulk publication failure\n");
199 item = (struct distr_item *)msg_data(buf_msg(buf));
201 publ_to_item(item, publ);
205 list_add_tail((struct list_head *)buf, message_list);
212 * tipc_named_node_up - tell specified node about all publications by this node
214 void tipc_named_node_up(u32 max_item_buf, u32 node)
216 LIST_HEAD(message_list);
218 read_lock_bh(&tipc_nametbl_lock);
219 named_distribute(&message_list, node, &publ_cluster, max_item_buf);
220 named_distribute(&message_list, node, &publ_zone, max_item_buf);
221 read_unlock_bh(&tipc_nametbl_lock);
223 tipc_link_names_xmit(&message_list, node);
227 * named_purge_publ - remove publication associated with a failed node
229 * Invoked for each publication issued by a newly failed node.
230 * Removes publication structure from name table & deletes it.
232 static void named_purge_publ(struct publication *publ)
234 struct publication *p;
236 write_lock_bh(&tipc_nametbl_lock);
237 p = tipc_nametbl_remove_publ(publ->type, publ->lower,
238 publ->node, publ->ref, publ->key);
240 tipc_nodesub_unsubscribe(&p->subscr);
241 write_unlock_bh(&tipc_nametbl_lock);
244 pr_err("Unable to remove publication from failed node\n"
245 " (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
246 publ->type, publ->lower, publ->node, publ->ref,
254 * tipc_named_rcv - process name table update message sent by another node
256 void tipc_named_rcv(struct sk_buff *buf)
258 struct publication *publ;
259 struct tipc_msg *msg = buf_msg(buf);
260 struct distr_item *item = (struct distr_item *)msg_data(msg);
261 u32 count = msg_data_sz(msg) / ITEM_SIZE;
263 write_lock_bh(&tipc_nametbl_lock);
265 if (msg_type(msg) == PUBLICATION) {
266 publ = tipc_nametbl_insert_publ(ntohl(item->type),
274 tipc_nodesub_subscribe(&publ->subscr,
280 } else if (msg_type(msg) == WITHDRAWAL) {
281 publ = tipc_nametbl_remove_publ(ntohl(item->type),
288 tipc_nodesub_unsubscribe(&publ->subscr);
291 pr_err("Unable to remove publication by node 0x%x\n"
292 " (type=%u, lower=%u, ref=%u, key=%u)\n",
293 msg_orignode(msg), ntohl(item->type),
294 ntohl(item->lower), ntohl(item->ref),
298 pr_warn("Unrecognized name table message received\n");
302 write_unlock_bh(&tipc_nametbl_lock);
307 * tipc_named_reinit - re-initialize local publications
309 * This routine is called whenever TIPC networking is enabled.
310 * All name table entries published by this node are updated to reflect
311 * the node's new network address.
313 void tipc_named_reinit(void)
315 struct publication *publ;
318 write_lock_bh(&tipc_nametbl_lock);
320 for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
321 list_for_each_entry(publ, &publ_lists[scope]->list, local_list)
322 publ->node = tipc_own_addr;
324 write_unlock_bh(&tipc_nametbl_lock);