![Erik Hugne](/assets/img/avatar_default.png)
All messages should go directly to the kernel log. The TIPC specific error, warning, info and debug trace macro's are removed and all references replaced with pr_err, pr_warn, pr_info and pr_debug. Commonly used sub-strings are explicitly declared as a const char to reduce .text size. Note that this means the debug messages (changed to pr_debug), are now enabled through dynamic debugging, instead of a TIPC specific Kconfig option (TIPC_DEBUG). The latter will be phased out completely Signed-off-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> [PG: use pr_fmt as suggested by Joe Perches <joe@perches.com>] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
446 lines
12 KiB
C
446 lines
12 KiB
C
/*
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* net/tipc/node.c: TIPC node management routines
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2005-2006, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "config.h"
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#include "node.h"
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#include "name_distr.h"
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#define NODE_HTABLE_SIZE 512
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static void node_lost_contact(struct tipc_node *n_ptr);
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static void node_established_contact(struct tipc_node *n_ptr);
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static DEFINE_SPINLOCK(node_create_lock);
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static struct hlist_head node_htable[NODE_HTABLE_SIZE];
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LIST_HEAD(tipc_node_list);
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static u32 tipc_num_nodes;
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static atomic_t tipc_num_links = ATOMIC_INIT(0);
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/*
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* A trivial power-of-two bitmask technique is used for speed, since this
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* operation is done for every incoming TIPC packet. The number of hash table
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* entries has been chosen so that no hash chain exceeds 8 nodes and will
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* usually be much smaller (typically only a single node).
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*/
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static unsigned int tipc_hashfn(u32 addr)
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{
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return addr & (NODE_HTABLE_SIZE - 1);
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}
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/*
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* tipc_node_find - locate specified node object, if it exists
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*/
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struct tipc_node *tipc_node_find(u32 addr)
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{
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struct tipc_node *node;
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struct hlist_node *pos;
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if (unlikely(!in_own_cluster_exact(addr)))
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return NULL;
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hlist_for_each_entry(node, pos, &node_htable[tipc_hashfn(addr)], hash) {
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if (node->addr == addr)
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return node;
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}
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return NULL;
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}
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/**
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* tipc_node_create - create neighboring node
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*
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* Currently, this routine is called by neighbor discovery code, which holds
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* net_lock for reading only. We must take node_create_lock to ensure a node
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* isn't created twice if two different bearers discover the node at the same
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* time. (It would be preferable to switch to holding net_lock in write mode,
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* but this is a non-trivial change.)
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*/
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struct tipc_node *tipc_node_create(u32 addr)
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{
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struct tipc_node *n_ptr, *temp_node;
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spin_lock_bh(&node_create_lock);
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n_ptr = tipc_node_find(addr);
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if (n_ptr) {
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spin_unlock_bh(&node_create_lock);
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return n_ptr;
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}
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n_ptr = kzalloc(sizeof(*n_ptr), GFP_ATOMIC);
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if (!n_ptr) {
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spin_unlock_bh(&node_create_lock);
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pr_warn("Node creation failed, no memory\n");
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return NULL;
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}
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n_ptr->addr = addr;
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spin_lock_init(&n_ptr->lock);
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INIT_HLIST_NODE(&n_ptr->hash);
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INIT_LIST_HEAD(&n_ptr->list);
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INIT_LIST_HEAD(&n_ptr->nsub);
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hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
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list_for_each_entry(temp_node, &tipc_node_list, list) {
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if (n_ptr->addr < temp_node->addr)
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break;
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}
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list_add_tail(&n_ptr->list, &temp_node->list);
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n_ptr->block_setup = WAIT_PEER_DOWN;
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n_ptr->signature = INVALID_NODE_SIG;
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tipc_num_nodes++;
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spin_unlock_bh(&node_create_lock);
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return n_ptr;
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}
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void tipc_node_delete(struct tipc_node *n_ptr)
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{
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list_del(&n_ptr->list);
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hlist_del(&n_ptr->hash);
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kfree(n_ptr);
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tipc_num_nodes--;
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}
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/**
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* tipc_node_link_up - handle addition of link
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*
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* Link becomes active (alone or shared) or standby, depending on its priority.
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*/
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void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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struct tipc_link **active = &n_ptr->active_links[0];
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n_ptr->working_links++;
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pr_info("Established link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->b_ptr->net_plane);
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if (!active[0]) {
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active[0] = active[1] = l_ptr;
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node_established_contact(n_ptr);
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return;
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}
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if (l_ptr->priority < active[0]->priority) {
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pr_info("New link <%s> becomes standby\n", l_ptr->name);
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return;
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}
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tipc_link_send_duplicate(active[0], l_ptr);
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if (l_ptr->priority == active[0]->priority) {
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active[0] = l_ptr;
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return;
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}
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pr_info("Old link <%s> becomes standby\n", active[0]->name);
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if (active[1] != active[0])
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pr_info("Old link <%s> becomes standby\n", active[1]->name);
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active[0] = active[1] = l_ptr;
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}
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/**
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* node_select_active_links - select active link
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*/
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static void node_select_active_links(struct tipc_node *n_ptr)
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{
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struct tipc_link **active = &n_ptr->active_links[0];
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u32 i;
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u32 highest_prio = 0;
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active[0] = active[1] = NULL;
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for (i = 0; i < MAX_BEARERS; i++) {
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struct tipc_link *l_ptr = n_ptr->links[i];
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if (!l_ptr || !tipc_link_is_up(l_ptr) ||
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(l_ptr->priority < highest_prio))
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continue;
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if (l_ptr->priority > highest_prio) {
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highest_prio = l_ptr->priority;
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active[0] = active[1] = l_ptr;
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} else {
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active[1] = l_ptr;
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}
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}
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}
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/**
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* tipc_node_link_down - handle loss of link
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*/
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void tipc_node_link_down(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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struct tipc_link **active;
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n_ptr->working_links--;
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if (!tipc_link_is_active(l_ptr)) {
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pr_info("Lost standby link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->b_ptr->net_plane);
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return;
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}
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pr_info("Lost link <%s> on network plane %c\n",
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l_ptr->name, l_ptr->b_ptr->net_plane);
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active = &n_ptr->active_links[0];
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if (active[0] == l_ptr)
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active[0] = active[1];
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if (active[1] == l_ptr)
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active[1] = active[0];
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if (active[0] == l_ptr)
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node_select_active_links(n_ptr);
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if (tipc_node_is_up(n_ptr))
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tipc_link_changeover(l_ptr);
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else
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node_lost_contact(n_ptr);
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}
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int tipc_node_active_links(struct tipc_node *n_ptr)
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{
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return n_ptr->active_links[0] != NULL;
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}
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int tipc_node_redundant_links(struct tipc_node *n_ptr)
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{
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return n_ptr->working_links > 1;
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}
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int tipc_node_is_up(struct tipc_node *n_ptr)
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{
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return tipc_node_active_links(n_ptr);
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}
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void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
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atomic_inc(&tipc_num_links);
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n_ptr->link_cnt++;
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}
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void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
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{
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n_ptr->links[l_ptr->b_ptr->identity] = NULL;
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atomic_dec(&tipc_num_links);
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n_ptr->link_cnt--;
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}
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static void node_established_contact(struct tipc_node *n_ptr)
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{
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tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
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if (n_ptr->bclink.supportable) {
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n_ptr->bclink.acked = tipc_bclink_get_last_sent();
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tipc_bclink_add_node(n_ptr->addr);
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n_ptr->bclink.supported = 1;
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}
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}
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static void node_name_purge_complete(unsigned long node_addr)
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{
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struct tipc_node *n_ptr;
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read_lock_bh(&tipc_net_lock);
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n_ptr = tipc_node_find(node_addr);
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if (n_ptr) {
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tipc_node_lock(n_ptr);
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n_ptr->block_setup &= ~WAIT_NAMES_GONE;
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tipc_node_unlock(n_ptr);
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}
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read_unlock_bh(&tipc_net_lock);
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}
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static void node_lost_contact(struct tipc_node *n_ptr)
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{
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char addr_string[16];
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u32 i;
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pr_info("Lost contact with %s\n",
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tipc_addr_string_fill(addr_string, n_ptr->addr));
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/* Flush broadcast link info associated with lost node */
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if (n_ptr->bclink.supported) {
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while (n_ptr->bclink.deferred_head) {
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struct sk_buff *buf = n_ptr->bclink.deferred_head;
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n_ptr->bclink.deferred_head = buf->next;
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kfree_skb(buf);
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}
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n_ptr->bclink.deferred_size = 0;
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if (n_ptr->bclink.defragm) {
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kfree_skb(n_ptr->bclink.defragm);
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n_ptr->bclink.defragm = NULL;
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}
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tipc_bclink_remove_node(n_ptr->addr);
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tipc_bclink_acknowledge(n_ptr, INVALID_LINK_SEQ);
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n_ptr->bclink.supported = 0;
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}
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/* Abort link changeover */
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for (i = 0; i < MAX_BEARERS; i++) {
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struct tipc_link *l_ptr = n_ptr->links[i];
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if (!l_ptr)
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continue;
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l_ptr->reset_checkpoint = l_ptr->next_in_no;
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l_ptr->exp_msg_count = 0;
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tipc_link_reset_fragments(l_ptr);
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}
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/* Notify subscribers */
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tipc_nodesub_notify(n_ptr);
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/* Prevent re-contact with node until cleanup is done */
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n_ptr->block_setup = WAIT_PEER_DOWN | WAIT_NAMES_GONE;
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tipc_k_signal((Handler)node_name_purge_complete, n_ptr->addr);
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}
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struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
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{
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u32 domain;
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struct sk_buff *buf;
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struct tipc_node *n_ptr;
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struct tipc_node_info node_info;
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u32 payload_size;
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if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
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return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
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domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
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if (!tipc_addr_domain_valid(domain))
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return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
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" (network address)");
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read_lock_bh(&tipc_net_lock);
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if (!tipc_num_nodes) {
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read_unlock_bh(&tipc_net_lock);
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return tipc_cfg_reply_none();
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}
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/* For now, get space for all other nodes */
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payload_size = TLV_SPACE(sizeof(node_info)) * tipc_num_nodes;
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if (payload_size > 32768u) {
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read_unlock_bh(&tipc_net_lock);
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return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
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" (too many nodes)");
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}
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buf = tipc_cfg_reply_alloc(payload_size);
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if (!buf) {
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read_unlock_bh(&tipc_net_lock);
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return NULL;
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}
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/* Add TLVs for all nodes in scope */
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list_for_each_entry(n_ptr, &tipc_node_list, list) {
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if (!tipc_in_scope(domain, n_ptr->addr))
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continue;
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node_info.addr = htonl(n_ptr->addr);
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node_info.up = htonl(tipc_node_is_up(n_ptr));
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tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
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&node_info, sizeof(node_info));
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}
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read_unlock_bh(&tipc_net_lock);
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return buf;
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}
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struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
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{
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u32 domain;
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struct sk_buff *buf;
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struct tipc_node *n_ptr;
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struct tipc_link_info link_info;
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u32 payload_size;
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if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_NET_ADDR))
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return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
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domain = ntohl(*(__be32 *)TLV_DATA(req_tlv_area));
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if (!tipc_addr_domain_valid(domain))
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return tipc_cfg_reply_error_string(TIPC_CFG_INVALID_VALUE
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" (network address)");
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if (!tipc_own_addr)
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return tipc_cfg_reply_none();
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read_lock_bh(&tipc_net_lock);
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/* Get space for all unicast links + broadcast link */
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payload_size = TLV_SPACE(sizeof(link_info)) *
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(atomic_read(&tipc_num_links) + 1);
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if (payload_size > 32768u) {
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read_unlock_bh(&tipc_net_lock);
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return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
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" (too many links)");
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}
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buf = tipc_cfg_reply_alloc(payload_size);
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if (!buf) {
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read_unlock_bh(&tipc_net_lock);
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return NULL;
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}
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/* Add TLV for broadcast link */
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link_info.dest = htonl(tipc_cluster_mask(tipc_own_addr));
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link_info.up = htonl(1);
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strlcpy(link_info.str, tipc_bclink_name, TIPC_MAX_LINK_NAME);
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tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
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/* Add TLVs for any other links in scope */
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list_for_each_entry(n_ptr, &tipc_node_list, list) {
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u32 i;
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if (!tipc_in_scope(domain, n_ptr->addr))
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continue;
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tipc_node_lock(n_ptr);
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for (i = 0; i < MAX_BEARERS; i++) {
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if (!n_ptr->links[i])
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continue;
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link_info.dest = htonl(n_ptr->addr);
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link_info.up = htonl(tipc_link_is_up(n_ptr->links[i]));
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strcpy(link_info.str, n_ptr->links[i]->name);
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tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO,
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&link_info, sizeof(link_info));
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}
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tipc_node_unlock(n_ptr);
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}
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read_unlock_bh(&tipc_net_lock);
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return buf;
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}
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