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94 lines
2.8 KiB
94 lines
2.8 KiB
/*
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* $Id$
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*
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* nonce id and pool management (stuff common to nonce-count and one
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* time nonces)
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*
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* Copyright (C) 2008 iptelorg GmbH
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*
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* This file is part of ser, a free SIP server.
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*
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* ser is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* ser is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Defines:
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* USE_NC, USE_OT_NONCE - if neither of them defined no code will be
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* compiled
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*/
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/*
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* History:
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* --------
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* 2008-07-08 initial version (andrei)
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*/
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#ifndef _nid_h
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#define _nid_h
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extern unsigned nid_pool_no; /* number of index pools */
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#if defined USE_NC || defined USE_OT_NONCE
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#include "../../atomic_ops.h"
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#include "../../pt.h" /* process_no */
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/* id incremenet, to avoid cacheline ping-pong and cover all the
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* array locations it should be a number prime with the array size and
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* bigger then the cacheline. Since this is used also for onetime nonces
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* => NID_INC/8 > CACHELINE
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* This number also limit the maximum pool/partition size, since the
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* id overlfow checks check if crt_id - nonce_id >= partition_size*NID_INC
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* => maximum partition size is (nid_t)(-1)/NID_INC*/
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#define NID_INC 257
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#define DEFAULT_NID_POOL_SIZE 1
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#define MAX_NID_POOL_SIZE 64 /* max. 6 bits used for the pool no*/
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#define CACHELINE_SIZE 256 /* more then most real-word cachelines */
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/* if larger tables are needed (see NID_INC comments above), consider
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* switching to unsigned long long */
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typedef unsigned int nid_t;
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struct pool_index{
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atomic_t id;
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char pad[CACHELINE_SIZE-sizeof(atomic_t)];/* padding to cacheline size */
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};
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extern struct pool_index* nid_crt;
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/* instead of storing only the 2^k size we store also k
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* for faster operations */
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extern unsigned int nid_pool_k; /* pools no in bits (k in 2^k) */
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extern unsigned int nid_pool_mask; /* mask for computing the current pool*/
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int init_nonce_id();
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void destroy_nonce_id();
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/* get current index in pool p */
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#define nid_get(p) \
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atomic_get(&nid_crt[(p)].id)
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/* get pool for the current process */
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#define nid_get_pool() (process_no & nid_pool_mask)
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/* inc the specified index and return its new value */
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#define nid_inc(pool) \
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((nid_t)atomic_add(&nid_crt[(pool)].id, NID_INC))
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#endif /* #if defined USE_NC || defined USE_OT_NONCE */
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#endif /* _nid_h */
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