path: root/net/tipc/name_table.c

/*
 * 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:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. 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.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * 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