summaryrefslogtreecommitdiffstats
path: root/net/tipc/node.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/tipc/node.c')
-rw-r--r--net/tipc/node.c676
1 files changed, 676 insertions, 0 deletions
diff --git a/net/tipc/node.c b/net/tipc/node.c
new file mode 100644
index 0000000..e311638
--- /dev/null
+++ b/net/tipc/node.c
@@ -0,0 +1,676 @@
+/*
+ * net/tipc/node.c: TIPC node management routines
+ *
+ * Copyright (c) 2003-2005, Ericsson Research Canada
+ * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "config.h"
+#include "node.h"
+#include "cluster.h"
+#include "net.h"
+#include "addr.h"
+#include "node_subscr.h"
+#include "link.h"
+#include "port.h"
+#include "bearer.h"
+#include "name_distr.h"
+#include "net.h"
+
+void node_print(struct print_buf *buf, struct node *n_ptr, char *str);
+static void node_lost_contact(struct node *n_ptr);
+static void node_established_contact(struct node *n_ptr);
+
+struct node *nodes = NULL; /* sorted list of nodes within cluster */
+
+u32 tipc_own_tag = 0;
+
+struct node *node_create(u32 addr)
+{
+ struct cluster *c_ptr;
+ struct node *n_ptr;
+ struct node **curr_node;
+
+ n_ptr = kmalloc(sizeof(*n_ptr),GFP_ATOMIC);
+ if (n_ptr != NULL) {
+ memset(n_ptr, 0, sizeof(*n_ptr));
+ n_ptr->addr = addr;
+ n_ptr->lock = SPIN_LOCK_UNLOCKED;
+ INIT_LIST_HEAD(&n_ptr->nsub);
+
+ c_ptr = cluster_find(addr);
+ if (c_ptr == NULL)
+ c_ptr = cluster_create(addr);
+ if (c_ptr != NULL) {
+ n_ptr->owner = c_ptr;
+ cluster_attach_node(c_ptr, n_ptr);
+ n_ptr->last_router = -1;
+
+ /* Insert node into ordered list */
+ for (curr_node = &nodes; *curr_node;
+ curr_node = &(*curr_node)->next) {
+ if (addr < (*curr_node)->addr) {
+ n_ptr->next = *curr_node;
+ break;
+ }
+ }
+ (*curr_node) = n_ptr;
+ } else {
+ kfree(n_ptr);
+ n_ptr = NULL;
+ }
+ }
+ return n_ptr;
+}
+
+void node_delete(struct node *n_ptr)
+{
+ if (!n_ptr)
+ return;
+
+#if 0
+ /* Not needed because links are already deleted via bearer_stop() */
+
+ u32 l_num;
+
+ for (l_num = 0; l_num < MAX_BEARERS; l_num++) {
+ link_delete(n_ptr->links[l_num]);
+ }
+#endif
+
+ dbg("node %x deleted\n", n_ptr->addr);
+ kfree(n_ptr);
+}
+
+
+/**
+ * node_link_up - handle addition of link
+ *
+ * Link becomes active (alone or shared) or standby, depending on its priority.
+ */
+
+void node_link_up(struct node *n_ptr, struct link *l_ptr)
+{
+ struct link **active = &n_ptr->active_links[0];
+
+ info("Established link <%s> on network plane %c\n",
+ l_ptr->name, l_ptr->b_ptr->net_plane);
+
+ if (!active[0]) {
+ dbg(" link %x into %x/%x\n", l_ptr, &active[0], &active[1]);
+ active[0] = active[1] = l_ptr;
+ node_established_contact(n_ptr);
+ return;
+ }
+ if (l_ptr->priority < active[0]->priority) {
+ info("Link is standby\n");
+ return;
+ }
+ link_send_duplicate(active[0], l_ptr);
+ if (l_ptr->priority == active[0]->priority) {
+ active[0] = l_ptr;
+ return;
+ }
+ info("Link <%s> on network plane %c becomes standby\n",
+ active[0]->name, active[0]->b_ptr->net_plane);
+ active[0] = active[1] = l_ptr;
+}
+
+/**
+ * node_select_active_links - select active link
+ */
+
+static void node_select_active_links(struct node *n_ptr)
+{
+ struct link **active = &n_ptr->active_links[0];
+ u32 i;
+ u32 highest_prio = 0;
+
+ active[0] = active[1] = 0;
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ struct link *l_ptr = n_ptr->links[i];
+
+ if (!l_ptr || !link_is_up(l_ptr) ||
+ (l_ptr->priority < highest_prio))
+ continue;
+
+ if (l_ptr->priority > highest_prio) {
+ highest_prio = l_ptr->priority;
+ active[0] = active[1] = l_ptr;
+ } else {
+ active[1] = l_ptr;
+ }
+ }
+}
+
+/**
+ * node_link_down - handle loss of link
+ */
+
+void node_link_down(struct node *n_ptr, struct link *l_ptr)
+{
+ struct link **active;
+
+ if (!link_is_active(l_ptr)) {
+ info("Lost standby link <%s> on network plane %c\n",
+ l_ptr->name, l_ptr->b_ptr->net_plane);
+ return;
+ }
+ info("Lost link <%s> on network plane %c\n",
+ l_ptr->name, l_ptr->b_ptr->net_plane);
+
+ active = &n_ptr->active_links[0];
+ if (active[0] == l_ptr)
+ active[0] = active[1];
+ if (active[1] == l_ptr)
+ active[1] = active[0];
+ if (active[0] == l_ptr)
+ node_select_active_links(n_ptr);
+ if (node_is_up(n_ptr))
+ link_changeover(l_ptr);
+ else
+ node_lost_contact(n_ptr);
+}
+
+int node_has_active_links(struct node *n_ptr)
+{
+ return (n_ptr &&
+ ((n_ptr->active_links[0]) || (n_ptr->active_links[1])));
+}
+
+int node_has_redundant_links(struct node *n_ptr)
+{
+ return (node_has_active_links(n_ptr) &&
+ (n_ptr->active_links[0] != n_ptr->active_links[1]));
+}
+
+int node_has_active_routes(struct node *n_ptr)
+{
+ return (n_ptr && (n_ptr->last_router >= 0));
+}
+
+int node_is_up(struct node *n_ptr)
+{
+ return (node_has_active_links(n_ptr) || node_has_active_routes(n_ptr));
+}
+
+struct node *node_attach_link(struct link *l_ptr)
+{
+ struct node *n_ptr = node_find(l_ptr->addr);
+
+ if (!n_ptr)
+ n_ptr = node_create(l_ptr->addr);
+ if (n_ptr) {
+ u32 bearer_id = l_ptr->b_ptr->identity;
+ char addr_string[16];
+
+ assert(bearer_id < MAX_BEARERS);
+ if (n_ptr->link_cnt >= 2) {
+ char addr_string[16];
+
+ err("Attempt to create third link to %s\n",
+ addr_string_fill(addr_string, n_ptr->addr));
+ return 0;
+ }
+
+ if (!n_ptr->links[bearer_id]) {
+ n_ptr->links[bearer_id] = l_ptr;
+ net.zones[tipc_zone(l_ptr->addr)]->links++;
+ n_ptr->link_cnt++;
+ return n_ptr;
+ }
+ err("Attempt to establish second link on <%s> to <%s> \n",
+ l_ptr->b_ptr->publ.name,
+ addr_string_fill(addr_string, l_ptr->addr));
+ }
+ return 0;
+}
+
+void node_detach_link(struct node *n_ptr, struct link *l_ptr)
+{
+ n_ptr->links[l_ptr->b_ptr->identity] = 0;
+ net.zones[tipc_zone(l_ptr->addr)]->links--;
+ n_ptr->link_cnt--;
+}
+
+/*
+ * Routing table management - five cases to handle:
+ *
+ * 1: A link towards a zone/cluster external node comes up.
+ * => Send a multicast message updating routing tables of all
+ * system nodes within own cluster that the new destination
+ * can be reached via this node.
+ * (node.establishedContact()=>cluster.multicastNewRoute())
+ *
+ * 2: A link towards a slave node comes up.
+ * => Send a multicast message updating routing tables of all
+ * system nodes within own cluster that the new destination
+ * can be reached via this node.
+ * (node.establishedContact()=>cluster.multicastNewRoute())
+ * => Send a message to the slave node about existence
+ * of all system nodes within cluster:
+ * (node.establishedContact()=>cluster.sendLocalRoutes())
+ *
+ * 3: A new cluster local system node becomes available.
+ * => Send message(s) to this particular node containing
+ * information about all cluster external and slave
+ * nodes which can be reached via this node.
+ * (node.establishedContact()==>network.sendExternalRoutes())
+ * (node.establishedContact()==>network.sendSlaveRoutes())
+ * => Send messages to all directly connected slave nodes
+ * containing information about the existence of the new node
+ * (node.establishedContact()=>cluster.multicastNewRoute())
+ *
+ * 4: The link towards a zone/cluster external node or slave
+ * node goes down.
+ * => Send a multcast message updating routing tables of all
+ * nodes within cluster that the new destination can not any
+ * longer be reached via this node.
+ * (node.lostAllLinks()=>cluster.bcastLostRoute())
+ *
+ * 5: A cluster local system node becomes unavailable.
+ * => Remove all references to this node from the local
+ * routing tables. Note: This is a completely node
+ * local operation.
+ * (node.lostAllLinks()=>network.removeAsRouter())
+ * => Send messages to all directly connected slave nodes
+ * containing information about loss of the node
+ * (node.establishedContact()=>cluster.multicastLostRoute())
+ *
+ */
+
+static void node_established_contact(struct node *n_ptr)
+{
+ struct cluster *c_ptr;
+
+ dbg("node_established_contact:-> %x\n", n_ptr->addr);
+ if (!node_has_active_routes(n_ptr)) {
+ k_signal((Handler)named_node_up, n_ptr->addr);
+ }
+
+ /* Syncronize broadcast acks */
+ n_ptr->bclink.acked = bclink_get_last_sent();
+
+ if (is_slave(tipc_own_addr))
+ return;
+ if (!in_own_cluster(n_ptr->addr)) {
+ /* Usage case 1 (see above) */
+ c_ptr = cluster_find(tipc_own_addr);
+ if (!c_ptr)
+ c_ptr = cluster_create(tipc_own_addr);
+ if (c_ptr)
+ cluster_bcast_new_route(c_ptr, n_ptr->addr, 1,
+ tipc_max_nodes);
+ return;
+ }
+
+ c_ptr = n_ptr->owner;
+ if (is_slave(n_ptr->addr)) {
+ /* Usage case 2 (see above) */
+ cluster_bcast_new_route(c_ptr, n_ptr->addr, 1, tipc_max_nodes);
+ cluster_send_local_routes(c_ptr, n_ptr->addr);
+ return;
+ }
+
+ if (n_ptr->bclink.supported) {
+ nmap_add(&cluster_bcast_nodes, n_ptr->addr);
+ if (n_ptr->addr < tipc_own_addr)
+ tipc_own_tag++;
+ }
+
+ /* Case 3 (see above) */
+ net_send_external_routes(n_ptr->addr);
+ cluster_send_slave_routes(c_ptr, n_ptr->addr);
+ cluster_bcast_new_route(c_ptr, n_ptr->addr, LOWEST_SLAVE,
+ highest_allowed_slave);
+}
+
+static void node_lost_contact(struct node *n_ptr)
+{
+ struct cluster *c_ptr;
+ struct node_subscr *ns, *tns;
+ char addr_string[16];
+ u32 i;
+
+ /* Clean up broadcast reception remains */
+ n_ptr->bclink.gap_after = n_ptr->bclink.gap_to = 0;
+ while (n_ptr->bclink.deferred_head) {
+ struct sk_buff* buf = n_ptr->bclink.deferred_head;
+ n_ptr->bclink.deferred_head = buf->next;
+ buf_discard(buf);
+ }
+ if (n_ptr->bclink.defragm) {
+ buf_discard(n_ptr->bclink.defragm);
+ n_ptr->bclink.defragm = NULL;
+ }
+ if (in_own_cluster(n_ptr->addr) && n_ptr->bclink.supported) {
+ bclink_acknowledge(n_ptr, mod(n_ptr->bclink.acked + 10000));
+ }
+
+ /* Update routing tables */
+ if (is_slave(tipc_own_addr)) {
+ net_remove_as_router(n_ptr->addr);
+ } else {
+ if (!in_own_cluster(n_ptr->addr)) {
+ /* Case 4 (see above) */
+ c_ptr = cluster_find(tipc_own_addr);
+ cluster_bcast_lost_route(c_ptr, n_ptr->addr, 1,
+ tipc_max_nodes);
+ } else {
+ /* Case 5 (see above) */
+ c_ptr = cluster_find(n_ptr->addr);
+ if (is_slave(n_ptr->addr)) {
+ cluster_bcast_lost_route(c_ptr, n_ptr->addr, 1,
+ tipc_max_nodes);
+ } else {
+ if (n_ptr->bclink.supported) {
+ nmap_remove(&cluster_bcast_nodes,
+ n_ptr->addr);
+ if (n_ptr->addr < tipc_own_addr)
+ tipc_own_tag--;
+ }
+ net_remove_as_router(n_ptr->addr);
+ cluster_bcast_lost_route(c_ptr, n_ptr->addr,
+ LOWEST_SLAVE,
+ highest_allowed_slave);
+ }
+ }
+ }
+ if (node_has_active_routes(n_ptr))
+ return;
+
+ info("Lost contact with %s\n",
+ addr_string_fill(addr_string, n_ptr->addr));
+
+ /* Abort link changeover */
+ for (i = 0; i < MAX_BEARERS; i++) {
+ struct link *l_ptr = n_ptr->links[i];
+ if (!l_ptr)
+ continue;
+ l_ptr->reset_checkpoint = l_ptr->next_in_no;
+ l_ptr->exp_msg_count = 0;
+ link_reset_fragments(l_ptr);
+ }
+
+ /* Notify subscribers */
+ list_for_each_entry_safe(ns, tns, &n_ptr->nsub, nodesub_list) {
+ ns->node = 0;
+ list_del_init(&ns->nodesub_list);
+ k_signal((Handler)ns->handle_node_down,
+ (unsigned long)ns->usr_handle);
+ }
+}
+
+/**
+ * node_select_next_hop - find the next-hop node for a message
+ *
+ * Called by when cluster local lookup has failed.
+ */
+
+struct node *node_select_next_hop(u32 addr, u32 selector)
+{
+ struct node *n_ptr;
+ u32 router_addr;
+
+ if (!addr_domain_valid(addr))
+ return 0;
+
+ /* Look for direct link to destination processsor */
+ n_ptr = node_find(addr);
+ if (n_ptr && node_has_active_links(n_ptr))
+ return n_ptr;
+
+ /* Cluster local system nodes *must* have direct links */
+ if (!is_slave(addr) && in_own_cluster(addr))
+ return 0;
+
+ /* Look for cluster local router with direct link to node */
+ router_addr = node_select_router(n_ptr, selector);
+ if (router_addr)
+ return node_select(router_addr, selector);
+
+ /* Slave nodes can only be accessed within own cluster via a
+ known router with direct link -- if no router was found,give up */
+ if (is_slave(addr))
+ return 0;
+
+ /* Inter zone/cluster -- find any direct link to remote cluster */
+ addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
+ n_ptr = net_select_remote_node(addr, selector);
+ if (n_ptr && node_has_active_links(n_ptr))
+ return n_ptr;
+
+ /* Last resort -- look for any router to anywhere in remote zone */
+ router_addr = net_select_router(addr, selector);
+ if (router_addr)
+ return node_select(router_addr, selector);
+
+ return 0;
+}
+
+/**
+ * node_select_router - select router to reach specified node
+ *
+ * Uses a deterministic and fair algorithm for selecting router node.
+ */
+
+u32 node_select_router(struct node *n_ptr, u32 ref)
+{
+ u32 ulim;
+ u32 mask;
+ u32 start;
+ u32 r;
+
+ if (!n_ptr)
+ return 0;
+
+ if (n_ptr->last_router < 0)
+ return 0;
+ ulim = ((n_ptr->last_router + 1) * 32) - 1;
+
+ /* Start entry must be random */
+ mask = tipc_max_nodes;
+ while (mask > ulim)
+ mask >>= 1;
+ start = ref & mask;
+ r = start;
+
+ /* Lookup upwards with wrap-around */
+ do {
+ if (((n_ptr->routers[r / 32]) >> (r % 32)) & 1)
+ break;
+ } while (++r <= ulim);
+ if (r > ulim) {
+ r = 1;
+ do {
+ if (((n_ptr->routers[r / 32]) >> (r % 32)) & 1)
+ break;
+ } while (++r < start);
+ assert(r != start);
+ }
+ assert(r && (r <= ulim));
+ return tipc_addr(own_zone(), own_cluster(), r);
+}
+
+void node_add_router(struct node *n_ptr, u32 router)
+{
+ u32 r_num = tipc_node(router);
+
+ n_ptr->routers[r_num / 32] =
+ ((1 << (r_num % 32)) | n_ptr->routers[r_num / 32]);
+ n_ptr->last_router = tipc_max_nodes / 32;
+ while ((--n_ptr->last_router >= 0) &&
+ !n_ptr->routers[n_ptr->last_router]);
+}
+
+void node_remove_router(struct node *n_ptr, u32 router)
+{
+ u32 r_num = tipc_node(router);
+
+ if (n_ptr->last_router < 0)
+ return; /* No routes */
+
+ n_ptr->routers[r_num / 32] =
+ ((~(1 << (r_num % 32))) & (n_ptr->routers[r_num / 32]));
+ n_ptr->last_router = tipc_max_nodes / 32;
+ while ((--n_ptr->last_router >= 0) &&
+ !n_ptr->routers[n_ptr->last_router]);
+
+ if (!node_is_up(n_ptr))
+ node_lost_contact(n_ptr);
+}
+
+#if 0
+void node_print(struct print_buf *buf, struct node *n_ptr, char *str)
+{
+ u32 i;
+
+ tipc_printf(buf, "\n\n%s", str);
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (!n_ptr->links[i])
+ continue;
+ tipc_printf(buf, "Links[%u]: %x, ", i, n_ptr->links[i]);
+ }
+ tipc_printf(buf, "Active links: [%x,%x]\n",
+ n_ptr->active_links[0], n_ptr->active_links[1]);
+}
+#endif
+
+u32 tipc_available_nodes(const u32 domain)
+{
+ struct node *n_ptr;
+ u32 cnt = 0;
+
+ for (n_ptr = nodes; n_ptr; n_ptr = n_ptr->next) {
+ if (!in_scope(domain, n_ptr->addr))
+ continue;
+ if (node_is_up(n_ptr))
+ cnt++;
+ }
+ return cnt;
+}
+
+struct sk_buff *node_get_nodes(const void *req_tlv_area, int req_tlv_space)
+{
+ u32 domain;
+ struct sk_buff *buf;
+ struct node *n_ptr;
+ struct tipc_node_info node_info;
+
+ if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
+ return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+ domain = *(u32 *)TLV_DATA(req_tlv_area);
+ domain = ntohl(domain);
+ if (!addr_domain_valid(domain))
+ return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+ " (network address)");
+
+ if (!nodes)
+ return cfg_reply_none();
+
+ /* For now, get space for all other nodes
+ (will need to modify this when slave nodes are supported */
+
+ buf = cfg_reply_alloc(TLV_SPACE(sizeof(node_info)) *
+ (tipc_max_nodes - 1));
+ if (!buf)
+ return NULL;
+
+ /* Add TLVs for all nodes in scope */
+
+ for (n_ptr = nodes; n_ptr; n_ptr = n_ptr->next) {
+ if (!in_scope(domain, n_ptr->addr))
+ continue;
+ node_info.addr = htonl(n_ptr->addr);
+ node_info.up = htonl(node_is_up(n_ptr));
+ cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
+ &node_info, sizeof(node_info));
+ }
+
+ return buf;
+}
+
+struct sk_buff *node_get_links(const void *req_tlv_area, int req_tlv_space)
+{
+ u32 domain;
+ struct sk_buff *buf;
+ struct node *n_ptr;
+ struct tipc_link_info link_info;
+
+ if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
+ return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
+
+ domain = *(u32 *)TLV_DATA(req_tlv_area);
+ domain = ntohl(domain);
+ if (!addr_domain_valid(domain))
+ return cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
+ " (network address)");
+
+ if (!nodes)
+ return cfg_reply_none();
+
+ /* For now, get space for 2 links to all other nodes + bcast link
+ (will need to modify this when slave nodes are supported */
+
+ buf = cfg_reply_alloc(TLV_SPACE(sizeof(link_info)) *
+ (2 * (tipc_max_nodes - 1) + 1));
+ if (!buf)
+ return NULL;
+
+ /* Add TLV for broadcast link */
+
+ link_info.dest = tipc_own_addr & 0xfffff00;
+ link_info.dest = htonl(link_info.dest);
+ link_info.up = htonl(1);
+ sprintf(link_info.str, bc_link_name);
+ cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
+
+ /* Add TLVs for any other links in scope */
+
+ for (n_ptr = nodes; n_ptr; n_ptr = n_ptr->next) {
+ u32 i;
+
+ if (!in_scope(domain, n_ptr->addr))
+ continue;
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (!n_ptr->links[i])
+ continue;
+ link_info.dest = htonl(n_ptr->addr);
+ link_info.up = htonl(link_is_up(n_ptr->links[i]));
+ strcpy(link_info.str, n_ptr->links[i]->name);
+ cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
+ &link_info, sizeof(link_info));
+ }
+ }
+
+ return buf;
+}
OpenPOWER on IntegriCloud