1 files changed, 73 insertions, 289 deletions

diff --git a/net/tipc/node.c b/net/tipc/node.c
index b4d87eb2dc5d..2d106ef4fa4c 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -2,7 +2,7 @@
  * net/tipc/node.c: TIPC node management routines
  *
  * Copyright (c) 2000-2006, Ericsson AB
- * Copyright (c) 2005-2006, Wind River Systems
+ * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -37,25 +37,38 @@
 #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"
 
-void node_print(struct print_buf *buf, struct tipc_node *n_ptr, char *str);
 static void node_lost_contact(struct tipc_node *n_ptr);
 static void node_established_contact(struct tipc_node *n_ptr);
 
-/* sorted list of nodes within cluster */
-static struct tipc_node *tipc_nodes = NULL;
-
 static DEFINE_SPINLOCK(node_create_lock);
 
-u32 tipc_own_tag = 0;
+static struct hlist_head node_htable[NODE_HTABLE_SIZE];
+LIST_HEAD(tipc_node_list);
+static u32 tipc_num_nodes;
+
+static atomic_t tipc_num_links = ATOMIC_INIT(0);
+u32 tipc_own_tag;
+
+/**
+ * tipc_node_find - locate specified node object, if it exists
+ */
+
+struct tipc_node *tipc_node_find(u32 addr)
+{
+        struct tipc_node *node;
+        struct hlist_node *pos;
+
+        if (unlikely(!in_own_cluster(addr)))
+                return NULL;
+
+        hlist_for_each_entry(node, pos, &node_htable[tipc_hashfn(addr)], hash) {
+                if (node->addr == addr)
+                        return node;
+        }
+        return NULL;
+}
 
 /**
  * tipc_node_create - create neighboring node
@@ -69,65 +82,50 @@ u32 tipc_own_tag = 0;
 
 struct tipc_node *tipc_node_create(u32 addr)
 {
-        struct cluster *c_ptr;
-        struct tipc_node *n_ptr;
-        struct tipc_node **curr_node;
+        struct tipc_node *n_ptr, *temp_node;
 
         spin_lock_bh(&node_create_lock);
 
-        for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) {
-                if (addr < n_ptr->addr)
-                        break;
-                if (addr == n_ptr->addr) {
-                        spin_unlock_bh(&node_create_lock);
-                        return n_ptr;
-                }
+        n_ptr = tipc_node_find(addr);
+        if (n_ptr) {
+                spin_unlock_bh(&node_create_lock);
+                return n_ptr;
         }
 
-        n_ptr = kzalloc(sizeof(*n_ptr),GFP_ATOMIC);
+        n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
         if (!n_ptr) {
                 spin_unlock_bh(&node_create_lock);
                 warn("Node creation failed, no memory\n");
                 return NULL;
         }
 
-        c_ptr = tipc_cltr_find(addr);
-        if (!c_ptr) {
-                c_ptr = tipc_cltr_create(addr);
-        }
-        if (!c_ptr) {
-                spin_unlock_bh(&node_create_lock);
-                kfree(n_ptr);
-                return NULL;
-        }
-
         n_ptr->addr = addr;
-                spin_lock_init(&n_ptr->lock);
+        spin_lock_init(&n_ptr->lock);
+        INIT_HLIST_NODE(&n_ptr->hash);
+        INIT_LIST_HEAD(&n_ptr->list);
         INIT_LIST_HEAD(&n_ptr->nsub);
-        n_ptr->owner = c_ptr;
-        tipc_cltr_attach_node(c_ptr, n_ptr);
-        n_ptr->last_router = -1;
-
-        /* Insert node into ordered list */
-        for (curr_node = &tipc_nodes; *curr_node;
-             curr_node = &(*curr_node)->next) {
-                if (addr < (*curr_node)->addr) {
-                        n_ptr->next = *curr_node;
+
+        hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
+
+        list_for_each_entry(temp_node, &tipc_node_list, list) {
+                if (n_ptr->addr < temp_node->addr)
                         break;
-                }
         }
-        (*curr_node) = n_ptr;
+        list_add_tail(&n_ptr->list, &temp_node->list);
+
+        tipc_num_nodes++;
+
         spin_unlock_bh(&node_create_lock);
         return n_ptr;
 }
 
 void tipc_node_delete(struct tipc_node *n_ptr)
 {
-        if (!n_ptr)
-                return;
-
-        dbg("node %x deleted\n", n_ptr->addr);
+        list_del(&n_ptr->list);
+        hlist_del(&n_ptr->hash);
         kfree(n_ptr);
+
+        tipc_num_nodes--;
 }
 
 
@@ -147,7 +145,6 @@ void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr)
              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;
@@ -226,59 +223,32 @@ void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr)
                 node_lost_contact(n_ptr);
 }
 
-int tipc_node_has_active_links(struct tipc_node *n_ptr)
+int tipc_node_active_links(struct tipc_node *n_ptr)
 {
         return n_ptr->active_links[0] != NULL;
 }
 
-int tipc_node_has_redundant_links(struct tipc_node *n_ptr)
+int tipc_node_redundant_links(struct tipc_node *n_ptr)
 {
         return n_ptr->working_links > 1;
 }
 
-static int tipc_node_has_active_routes(struct tipc_node *n_ptr)
-{
-        return n_ptr && (n_ptr->last_router >= 0);
-}
-
 int tipc_node_is_up(struct tipc_node *n_ptr)
 {
-        return tipc_node_has_active_links(n_ptr) || tipc_node_has_active_routes(n_ptr);
+        return tipc_node_active_links(n_ptr);
 }
 
-struct tipc_node *tipc_node_attach_link(struct link *l_ptr)
+void tipc_node_attach_link(struct tipc_node *n_ptr, struct link *l_ptr)
 {
-        struct tipc_node *n_ptr = tipc_node_find(l_ptr->addr);
-
-        if (!n_ptr)
-                n_ptr = tipc_node_create(l_ptr->addr);
-        if (n_ptr) {
-                u32 bearer_id = l_ptr->b_ptr->identity;
-                char addr_string[16];
-
-                if (n_ptr->link_cnt >= 2) {
-                        err("Attempt to create third link to %s\n",
-                            tipc_addr_string_fill(addr_string, n_ptr->addr));
-                        return NULL;
-                }
-
-                if (!n_ptr->links[bearer_id]) {
-                        n_ptr->links[bearer_id] = l_ptr;
-                        tipc_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,
-                    tipc_addr_string_fill(addr_string, l_ptr->addr));
-        }
-        return NULL;
+        n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
+        atomic_inc(&tipc_num_links);
+        n_ptr->link_cnt++;
 }
 
 void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr)
 {
         n_ptr->links[l_ptr->b_ptr->identity] = NULL;
-        tipc_net.zones[tipc_zone(l_ptr->addr)]->links--;
+        atomic_dec(&tipc_num_links);
         n_ptr->link_cnt--;
 }
 
@@ -330,48 +300,16 @@ void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr)
 
 static void node_established_contact(struct tipc_node *n_ptr)
 {
-        struct cluster *c_ptr;
-
-        dbg("node_established_contact:-> %x\n", n_ptr->addr);
-        if (!tipc_node_has_active_routes(n_ptr) && in_own_cluster(n_ptr->addr)) {
-                tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
-        }
+        tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
 
         /* Syncronize broadcast acks */
         n_ptr->bclink.acked = tipc_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 = tipc_cltr_find(tipc_own_addr);
-                if (!c_ptr)
-                        c_ptr = tipc_cltr_create(tipc_own_addr);
-                if (c_ptr)
-                        tipc_cltr_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) */
-                tipc_cltr_bcast_new_route(c_ptr, n_ptr->addr, 1, tipc_max_nodes);
-                tipc_cltr_send_local_routes(c_ptr, n_ptr->addr);
-                return;
-        }
-
         if (n_ptr->bclink.supported) {
-                tipc_nmap_add(&tipc_cltr_bcast_nodes, n_ptr->addr);
+                tipc_nmap_add(&tipc_bcast_nmap, n_ptr->addr);
                 if (n_ptr->addr < tipc_own_addr)
                         tipc_own_tag++;
         }
-
-        /* Case 3 (see above) */
-        tipc_net_send_external_routes(n_ptr->addr);
-        tipc_cltr_send_slave_routes(c_ptr, n_ptr->addr);
-        tipc_cltr_bcast_new_route(c_ptr, n_ptr->addr, LOWEST_SLAVE,
-                                  tipc_highest_allowed_slave);
 }
 
 static void node_cleanup_finished(unsigned long node_addr)
@@ -390,15 +328,13 @@ static void node_cleanup_finished(unsigned long node_addr)
 
 static void node_lost_contact(struct tipc_node *n_ptr)
 {
-        struct cluster *c_ptr;
-        struct tipc_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;
+                struct sk_buff *buf = n_ptr->bclink.deferred_head;
                 n_ptr->bclink.deferred_head = buf->next;
                 buf_discard(buf);
         }
@@ -406,41 +342,14 @@ static void node_lost_contact(struct tipc_node *n_ptr)
                 buf_discard(n_ptr->bclink.defragm);
                 n_ptr->bclink.defragm = NULL;
         }
-        if (in_own_cluster(n_ptr->addr) && n_ptr->bclink.supported) {
-                tipc_bclink_acknowledge(n_ptr, mod(n_ptr->bclink.acked + 10000));
-        }
 
-        /* Update routing tables */
-        if (is_slave(tipc_own_addr)) {
-                tipc_net_remove_as_router(n_ptr->addr);
-        } else {
-                if (!in_own_cluster(n_ptr->addr)) {
-                        /* Case 4 (see above) */
-                        c_ptr = tipc_cltr_find(tipc_own_addr);
-                        tipc_cltr_bcast_lost_route(c_ptr, n_ptr->addr, 1,
-                                                   tipc_max_nodes);
-                } else {
-                        /* Case 5 (see above) */
-                        c_ptr = tipc_cltr_find(n_ptr->addr);
-                        if (is_slave(n_ptr->addr)) {
-                                tipc_cltr_bcast_lost_route(c_ptr, n_ptr->addr, 1,
-                                                           tipc_max_nodes);
-                        } else {
-                                if (n_ptr->bclink.supported) {
-                                        tipc_nmap_remove(&tipc_cltr_bcast_nodes,
-                                                         n_ptr->addr);
-                                        if (n_ptr->addr < tipc_own_addr)
-                                                tipc_own_tag--;
-                                }
-                                tipc_net_remove_as_router(n_ptr->addr);
-                                tipc_cltr_bcast_lost_route(c_ptr, n_ptr->addr,
-                                                           LOWEST_SLAVE,
-                                                           tipc_highest_allowed_slave);
-                        }
-                }
+        if (n_ptr->bclink.supported) {
+                tipc_bclink_acknowledge(n_ptr,
+                                        mod(n_ptr->bclink.acked + 10000));
+                tipc_nmap_remove(&tipc_bcast_nmap, n_ptr->addr);
+                if (n_ptr->addr < tipc_own_addr)
+                        tipc_own_tag--;
         }
-        if (tipc_node_has_active_routes(n_ptr))
-                return;
 
         info("Lost contact with %s\n",
              tipc_addr_string_fill(addr_string, n_ptr->addr));
@@ -456,12 +365,7 @@ static void node_lost_contact(struct tipc_node *n_ptr)
         }
 
         /* Notify subscribers */
-        list_for_each_entry_safe(ns, tns, &n_ptr->nsub, nodesub_list) {
-                ns->node = NULL;
-                list_del_init(&ns->nodesub_list);
-                tipc_k_signal((Handler)ns->handle_node_down,
-                              (unsigned long)ns->usr_handle);
-        }
+        tipc_nodesub_notify(n_ptr);
 
         /* Prevent re-contact with node until all cleanup is done */
 
@@ -469,125 +373,6 @@ static void node_lost_contact(struct tipc_node *n_ptr)
         tipc_k_signal((Handler)node_cleanup_finished, n_ptr->addr);
 }
 
-/**
- * tipc_node_select_next_hop - find the next-hop node for a message
- *
- * Called by when cluster local lookup has failed.
- */
-
-struct tipc_node *tipc_node_select_next_hop(u32 addr, u32 selector)
-{
-        struct tipc_node *n_ptr;
-        u32 router_addr;
-
-        if (!tipc_addr_domain_valid(addr))
-                return NULL;
-
-        /* Look for direct link to destination processsor */
-        n_ptr = tipc_node_find(addr);
-        if (n_ptr && tipc_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 NULL;
-
-        /* Look for cluster local router with direct link to node */
-        router_addr = tipc_node_select_router(n_ptr, selector);
-        if (router_addr)
-                return tipc_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 NULL;
-
-        /* Inter zone/cluster -- find any direct link to remote cluster */
-        addr = tipc_addr(tipc_zone(addr), tipc_cluster(addr), 0);
-        n_ptr = tipc_net_select_remote_node(addr, selector);
-        if (n_ptr && tipc_node_has_active_links(n_ptr))
-                return n_ptr;
-
-        /* Last resort -- look for any router to anywhere in remote zone */
-        router_addr =  tipc_net_select_router(addr, selector);
-        if (router_addr)
-                return tipc_node_select(router_addr, selector);
-
-        return NULL;
-}
-
-/**
- * tipc_node_select_router - select router to reach specified node
- *
- * Uses a deterministic and fair algorithm for selecting router node.
- */
-
-u32 tipc_node_select_router(struct tipc_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 tipc_node_add_router(struct tipc_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 tipc_node_remove_router(struct tipc_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 (!tipc_node_is_up(n_ptr))
-                node_lost_contact(n_ptr);
-}
-
 struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
 {
         u32 domain;
@@ -605,15 +390,14 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
                                                    " (network address)");
 
         read_lock_bh(&tipc_net_lock);
-        if (!tipc_nodes) {
+        if (!tipc_num_nodes) {
                 read_unlock_bh(&tipc_net_lock);
                 return tipc_cfg_reply_none();
         }
 
-        /* For now, get space for all other nodes
-           (will need to modify this when slave nodes are supported */
+        /* For now, get space for all other nodes */
 
-        payload_size = TLV_SPACE(sizeof(node_info)) * (tipc_max_nodes - 1);
+        payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
         if (payload_size > 32768u) {
                 read_unlock_bh(&tipc_net_lock);
                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
@@ -627,7 +411,7 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
 
         /* Add TLVs for all nodes in scope */
 
-        for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) {
+        list_for_each_entry(n_ptr, &tipc_node_list, list) {
                 if (!tipc_in_scope(domain, n_ptr->addr))
                         continue;
                 node_info.addr = htonl(n_ptr->addr);
@@ -664,7 +448,7 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
         /* Get space for all unicast links + multicast link */
 
         payload_size = TLV_SPACE(sizeof(link_info)) *
-                (tipc_net.zones[tipc_zone(tipc_own_addr)]->links + 1);
+                (atomic_read(&tipc_num_links) + 1);
         if (payload_size > 32768u) {
                 read_unlock_bh(&tipc_net_lock);
                 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
@@ -678,14 +462,14 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
 
         /* Add TLV for broadcast link */
 
-        link_info.dest = htonl(tipc_own_addr & 0xfffff00);
+        link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
         link_info.up = htonl(1);
         strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
         tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
 
         /* Add TLVs for any other links in scope */
 
-        for (n_ptr = tipc_nodes; n_ptr; n_ptr = n_ptr->next) {
+        list_for_each_entry(n_ptr, &tipc_node_list, list) {
                 u32 i;
 
                 if (!tipc_in_scope(domain, n_ptr->addr))