/*
* net/tipc/name_table.c: TIPC name table code
*
* Copyright (c) 2003-2005, Ericsson Research Canada
* Copyright (c) 2004-2005, 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 "dbg.h"
#include "name_table.h"
#include "name_distr.h"
#include "addr.h"
#include "node_subscr.h"
#include "subscr.h"
#include "port.h"
#include "cluster.h"
#include "bcast.h"
int tipc_nametbl_size = 1024; /* must be a power of 2 */
/**
* struct sub_seq - container for all published instances of a name sequence
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @node_list: circular list of matching publications with >= node scope
* @cluster_list: circular list of matching publications with >= cluster scope
* @zone_list: circular list of matching publications with >= zone scope
*/
struct sub_seq {
u32 lower;
u32 upper;
struct publication *node_list;
struct publication *cluster_list;
struct publication *zone_list;
};
/**
* struct name_seq - container for all published instances of a name type
* @type: 32 bit 'type' value for name sequence
* @sseq: pointer to dynamically-sized array of sub-sequences of this 'type';
* sub-sequences are sorted in ascending order
* @alloc: number of sub-sequences currently in array
* @first_free: upper bound of highest sub-sequence + 1
* @ns_list: links to adjacent name sequences in hash chain
* @subscriptions: list of subscriptions for this 'type'
* @lock: spinlock controlling access to name sequence structure
*/
struct name_seq {
u32 type;
struct sub_seq *sseqs;
u32 alloc;
u32 first_free;
struct hlist_node ns_list;
struct list_head subscriptions;
spinlock_t lock;
};
/**
* struct name_table - table containing all existing port name publications
* @types: pointer to fixed-sized array of name sequence lists,
* accessed via hashing on 'type'; name sequence lists are *not* sorted
* @local_publ_count: number of publications issued by this node
*/
struct name_table {
struct hlist_head *types;
u32 local_publ_count;
};
struct name_table table = { NULL } ;
static atomic_t rsv_publ_ok = ATOMIC_INIT(0);
rwlock_t nametbl_lock = RW_LOCK_UNLOCKED;
static inline int hash(int x)
{
return(x & (tipc_nametbl_size - 1));
}
/**
* publ_create - create a publication structure
*/
static struct publication *publ_create(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port_ref,
u32 key)
{
struct publication *publ =
(struct publication *)kmalloc(sizeof(*publ), GFP_ATOMIC);
if (publ == NULL) {
warn("Memory squeeze; failed to create publication\n");
return 0;
}
memset(publ, 0, sizeof(*publ));
publ->type = type;
publ->lower = lower;
publ->upper = upper;
publ->scope = scope;
publ->node = node;
publ->ref = port_ref;
publ->key = key;
INIT_LIST_HEAD(&publ->local_list);
INIT_LIST_HEAD(&publ->pport_list);
INIT_LIST_HEAD(&publ->subscr.nodesub_list);
return publ;
}
/**
* subseq_alloc - allocate a specified number of sub-sequence structures
*/
struct sub_seq *subseq_alloc(u32 cnt)
{
u32 sz = cnt * sizeof(struct sub_seq);
struct sub_seq *sseq = (struct sub_seq *)kmalloc(sz, GFP_ATOMIC);
if (sseq)
memset(sseq, 0, sz);
return sseq;
}
/**
* nameseq_create - create a name sequence structure for the specified 'type'
*
* Allocates a single sub-sequence structure and sets it to all 0's.
*/
struct name_seq *nameseq_create(u32 type, struct hlist_head *seq_head)
{
struct name_seq *nseq =
(struct name_seq *)kmalloc(sizeof(*nseq), GFP_ATOMIC);
struct sub_seq *sseq = subseq_alloc(1);
if (!nseq || !sseq)