The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_lock_bsd.h

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *   this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *   the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: stable/9/sys/netinet/sctp_lock_bsd.h 237896 2012-07-01 07:59:00Z tuexen $");
   35 
   36 #ifndef _NETINET_SCTP_LOCK_BSD_H_
   37 #define _NETINET_SCTP_LOCK_BSD_H_
   38 
   39 /*
   40  * General locking concepts: The goal of our locking is to of course provide
   41  * consistency and yet minimize overhead. We will attempt to use
   42  * non-recursive locks which are supposed to be quite inexpensive. Now in
   43  * order to do this the goal is that most functions are not aware of locking.
   44  * Once we have a TCB we lock it and unlock when we are through. This means
   45  * that the TCB lock is kind-of a "global" lock when working on an
   46  * association. Caution must be used when asserting a TCB_LOCK since if we
   47  * recurse we deadlock.
   48  *
   49  * Most other locks (INP and INFO) attempt to localize the locking i.e. we try
   50  * to contain the lock and unlock within the function that needs to lock it.
   51  * This sometimes mean we do extra locks and unlocks and lose a bit of
   52  * efficency, but if the performance statements about non-recursive locks are
   53  * true this should not be a problem.  One issue that arises with this only
   54  * lock when needed is that if an implicit association setup is done we have
   55  * a problem. If at the time I lookup an association I have NULL in the tcb
   56  * return, by the time I call to create the association some other processor
   57  * could have created it. This is what the CREATE lock on the endpoint.
   58  * Places where we will be implicitly creating the association OR just
   59  * creating an association (the connect call) will assert the CREATE_INP
   60  * lock. This will assure us that during all the lookup of INP and INFO if
   61  * another creator is also locking/looking up we can gate the two to
   62  * synchronize. So the CREATE_INP lock is also another one we must use
   63  * extreme caution in locking to make sure we don't hit a re-entrancy issue.
   64  *
   65  * For non FreeBSD 5.x we provide a bunch of EMPTY lock macros so we can
   66  * blatantly put locks everywhere and they reduce to nothing on
   67  * NetBSD/OpenBSD and FreeBSD 4.x
   68  *
   69  */
   70 
   71 /*
   72  * When working with the global SCTP lists we lock and unlock the INP_INFO
   73  * lock. So when we go to lookup an association we will want to do a
   74  * SCTP_INP_INFO_RLOCK() and then when we want to add a new association to
   75  * the SCTP_BASE_INFO() list's we will do a SCTP_INP_INFO_WLOCK().
   76  */
   77 
   78 extern struct sctp_foo_stuff sctp_logoff[];
   79 extern int sctp_logoff_stuff;
   80 
   81 #define SCTP_IPI_COUNT_INIT()
   82 
   83 #define SCTP_STATLOG_INIT_LOCK()
   84 #define SCTP_STATLOG_LOCK()
   85 #define SCTP_STATLOG_UNLOCK()
   86 #define SCTP_STATLOG_DESTROY()
   87 
   88 #define SCTP_INP_INFO_LOCK_DESTROY() do { \
   89         if(rw_wowned(&SCTP_BASE_INFO(ipi_ep_mtx))) { \
   90              rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \
   91         } \
   92         rw_destroy(&SCTP_BASE_INFO(ipi_ep_mtx)); \
   93       }  while (0)
   94 
   95 #define SCTP_INP_INFO_LOCK_INIT() \
   96         rw_init(&SCTP_BASE_INFO(ipi_ep_mtx), "sctp-info");
   97 
   98 
   99 #define SCTP_INP_INFO_RLOCK()   do {                                    \
  100              rw_rlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \
  101 } while (0)
  102 
  103 #define SCTP_MCORE_QLOCK_INIT(cpstr) do { \
  104                 mtx_init(&(cpstr)->que_mtx,           \
  105                          "sctp-mcore_queue","queue_lock",       \
  106                          MTX_DEF|MTX_DUPOK);            \
  107 } while (0)
  108 
  109 #define SCTP_MCORE_QLOCK(cpstr)  do { \
  110                 mtx_lock(&(cpstr)->que_mtx);    \
  111 } while (0)
  112 
  113 #define SCTP_MCORE_QUNLOCK(cpstr)  do { \
  114                 mtx_unlock(&(cpstr)->que_mtx);  \
  115 } while (0)
  116 
  117 #define SCTP_MCORE_QDESTROY(cpstr)  do { \
  118         if(mtx_owned(&(cpstr)->core_mtx)) {     \
  119                 mtx_unlock(&(cpstr)->que_mtx);  \
  120         } \
  121         mtx_destroy(&(cpstr)->que_mtx); \
  122 } while (0)
  123 
  124 
  125 #define SCTP_MCORE_LOCK_INIT(cpstr) do { \
  126                 mtx_init(&(cpstr)->core_mtx,          \
  127                          "sctp-cpulck","cpu_proc_lock", \
  128                          MTX_DEF|MTX_DUPOK);            \
  129 } while (0)
  130 
  131 #define SCTP_MCORE_LOCK(cpstr)  do { \
  132                 mtx_lock(&(cpstr)->core_mtx);   \
  133 } while (0)
  134 
  135 #define SCTP_MCORE_UNLOCK(cpstr)  do { \
  136                 mtx_unlock(&(cpstr)->core_mtx); \
  137 } while (0)
  138 
  139 #define SCTP_MCORE_DESTROY(cpstr)  do { \
  140         if(mtx_owned(&(cpstr)->core_mtx)) {     \
  141                 mtx_unlock(&(cpstr)->core_mtx); \
  142         } \
  143         mtx_destroy(&(cpstr)->core_mtx);        \
  144 } while (0)
  145 
  146 #define SCTP_INP_INFO_WLOCK()   do {                                    \
  147             rw_wlock(&SCTP_BASE_INFO(ipi_ep_mtx));                         \
  148 } while (0)
  149 
  150 
  151 #define SCTP_INP_INFO_RUNLOCK()         rw_runlock(&SCTP_BASE_INFO(ipi_ep_mtx))
  152 #define SCTP_INP_INFO_WUNLOCK()         rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx))
  153 
  154 
  155 #define SCTP_IPI_ADDR_INIT()                                                            \
  156         rw_init(&SCTP_BASE_INFO(ipi_addr_mtx), "sctp-addr")
  157 #define SCTP_IPI_ADDR_DESTROY() do  { \
  158         if(rw_wowned(&SCTP_BASE_INFO(ipi_addr_mtx))) { \
  159              rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \
  160         } \
  161         rw_destroy(&SCTP_BASE_INFO(ipi_addr_mtx)); \
  162       }  while (0)
  163 #define SCTP_IPI_ADDR_RLOCK()   do {                                    \
  164              rw_rlock(&SCTP_BASE_INFO(ipi_addr_mtx));                         \
  165 } while (0)
  166 #define SCTP_IPI_ADDR_WLOCK()   do {                                    \
  167              rw_wlock(&SCTP_BASE_INFO(ipi_addr_mtx));                         \
  168 } while (0)
  169 
  170 #define SCTP_IPI_ADDR_RUNLOCK()         rw_runlock(&SCTP_BASE_INFO(ipi_addr_mtx))
  171 #define SCTP_IPI_ADDR_WUNLOCK()         rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx))
  172 
  173 
  174 #define SCTP_IPI_ITERATOR_WQ_INIT() \
  175         mtx_init(&sctp_it_ctl.ipi_iterator_wq_mtx, "sctp-it-wq", "sctp_it_wq", MTX_DEF)
  176 
  177 #define SCTP_IPI_ITERATOR_WQ_DESTROY() \
  178         mtx_destroy(&sctp_it_ctl.ipi_iterator_wq_mtx)
  179 
  180 #define SCTP_IPI_ITERATOR_WQ_LOCK()     do {                                    \
  181              mtx_lock(&sctp_it_ctl.ipi_iterator_wq_mtx);                \
  182 } while (0)
  183 
  184 #define SCTP_IPI_ITERATOR_WQ_UNLOCK()           mtx_unlock(&sctp_it_ctl.ipi_iterator_wq_mtx)
  185 
  186 
  187 #define SCTP_IP_PKTLOG_INIT() \
  188         mtx_init(&SCTP_BASE_INFO(ipi_pktlog_mtx), "sctp-pktlog", "packetlog", MTX_DEF)
  189 
  190 
  191 #define SCTP_IP_PKTLOG_LOCK()   do {                    \
  192              mtx_lock(&SCTP_BASE_INFO(ipi_pktlog_mtx));     \
  193 } while (0)
  194 
  195 #define SCTP_IP_PKTLOG_UNLOCK() mtx_unlock(&SCTP_BASE_INFO(ipi_pktlog_mtx))
  196 
  197 #define SCTP_IP_PKTLOG_DESTROY() \
  198         mtx_destroy(&SCTP_BASE_INFO(ipi_pktlog_mtx))
  199 
  200 
  201 
  202 
  203 
  204 /*
  205  * The INP locks we will use for locking an SCTP endpoint, so for example if
  206  * we want to change something at the endpoint level for example random_store
  207  * or cookie secrets we lock the INP level.
  208  */
  209 
  210 #define SCTP_INP_READ_INIT(_inp) \
  211         mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", MTX_DEF | MTX_DUPOK)
  212 
  213 #define SCTP_INP_READ_DESTROY(_inp) \
  214         mtx_destroy(&(_inp)->inp_rdata_mtx)
  215 
  216 #define SCTP_INP_READ_LOCK(_inp)        do { \
  217         mtx_lock(&(_inp)->inp_rdata_mtx);    \
  218 } while (0)
  219 
  220 
  221 #define SCTP_INP_READ_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_rdata_mtx)
  222 
  223 
  224 #define SCTP_INP_LOCK_INIT(_inp) \
  225         mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", MTX_DEF | MTX_DUPOK)
  226 #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
  227         mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \
  228                  MTX_DEF | MTX_DUPOK)
  229 
  230 #define SCTP_INP_LOCK_DESTROY(_inp) \
  231         mtx_destroy(&(_inp)->inp_mtx)
  232 
  233 #define SCTP_INP_LOCK_CONTENDED(_inp) ((_inp)->inp_mtx.mtx_lock & MTX_CONTESTED)
  234 
  235 #define SCTP_INP_READ_CONTENDED(_inp) ((_inp)->inp_rdata_mtx.mtx_lock & MTX_CONTESTED)
  236 
  237 #define SCTP_ASOC_CREATE_LOCK_CONTENDED(_inp) ((_inp)->inp_create_mtx.mtx_lock & MTX_CONTESTED)
  238 
  239 
  240 #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) \
  241         mtx_destroy(&(_inp)->inp_create_mtx)
  242 
  243 
  244 #ifdef SCTP_LOCK_LOGGING
  245 #define SCTP_INP_RLOCK(_inp)    do {                                    \
  246         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
  247         mtx_lock(&(_inp)->inp_mtx);                                     \
  248 } while (0)
  249 
  250 #define SCTP_INP_WLOCK(_inp)    do {                                    \
  251         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
  252         mtx_lock(&(_inp)->inp_mtx);                                     \
  253 } while (0)
  254 
  255 #else
  256 
  257 #define SCTP_INP_RLOCK(_inp)    do {                                    \
  258         mtx_lock(&(_inp)->inp_mtx);                                     \
  259 } while (0)
  260 
  261 #define SCTP_INP_WLOCK(_inp)    do {                                    \
  262         mtx_lock(&(_inp)->inp_mtx);                                     \
  263 } while (0)
  264 
  265 #endif
  266 
  267 
  268 #define SCTP_TCB_SEND_LOCK_INIT(_tcb) \
  269         mtx_init(&(_tcb)->tcb_send_mtx, "sctp-send-tcb", "tcbs", MTX_DEF | MTX_DUPOK)
  270 
  271 #define SCTP_TCB_SEND_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_send_mtx)
  272 
  273 #define SCTP_TCB_SEND_LOCK(_tcb)  do { \
  274         mtx_lock(&(_tcb)->tcb_send_mtx); \
  275 } while (0)
  276 
  277 #define SCTP_TCB_SEND_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_send_mtx)
  278 
  279 #define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1)
  280 #define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1)
  281 
  282 
  283 #ifdef SCTP_LOCK_LOGGING
  284 #define SCTP_ASOC_CREATE_LOCK(_inp) \
  285         do {                                                            \
  286         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_CREATE); \
  287                 mtx_lock(&(_inp)->inp_create_mtx);                      \
  288         } while (0)
  289 #else
  290 
  291 #define SCTP_ASOC_CREATE_LOCK(_inp) \
  292         do {                                                            \
  293                 mtx_lock(&(_inp)->inp_create_mtx);                      \
  294         } while (0)
  295 #endif
  296 
  297 #define SCTP_INP_RUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
  298 #define SCTP_INP_WUNLOCK(_inp)          mtx_unlock(&(_inp)->inp_mtx)
  299 #define SCTP_ASOC_CREATE_UNLOCK(_inp)   mtx_unlock(&(_inp)->inp_create_mtx)
  300 
  301 /*
  302  * For the majority of things (once we have found the association) we will
  303  * lock the actual association mutex. This will protect all the assoiciation
  304  * level queues and streams and such. We will need to lock the socket layer
  305  * when we stuff data up into the receiving sb_mb. I.e. we will need to do an
  306  * extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked.
  307  */
  308 
  309 #define SCTP_TCB_LOCK_INIT(_tcb) \
  310         mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", MTX_DEF | MTX_DUPOK)
  311 
  312 #define SCTP_TCB_LOCK_DESTROY(_tcb)     mtx_destroy(&(_tcb)->tcb_mtx)
  313 
  314 #ifdef SCTP_LOCK_LOGGING
  315 #define SCTP_TCB_LOCK(_tcb)  do {                                       \
  316         if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE)  sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB);          \
  317         mtx_lock(&(_tcb)->tcb_mtx);                                     \
  318 } while (0)
  319 
  320 #else
  321 #define SCTP_TCB_LOCK(_tcb)  do {                                       \
  322         mtx_lock(&(_tcb)->tcb_mtx);                                     \
  323 } while (0)
  324 
  325 #endif
  326 
  327 
  328 #define SCTP_TCB_TRYLOCK(_tcb)  mtx_trylock(&(_tcb)->tcb_mtx)
  329 
  330 #define SCTP_TCB_UNLOCK(_tcb)           mtx_unlock(&(_tcb)->tcb_mtx)
  331 
  332 #define SCTP_TCB_UNLOCK_IFOWNED(_tcb)         do { \
  333                                                 if (mtx_owned(&(_tcb)->tcb_mtx)) \
  334                                                      mtx_unlock(&(_tcb)->tcb_mtx); \
  335                                               } while (0)
  336 
  337 
  338 
  339 #ifdef INVARIANTS
  340 #define SCTP_TCB_LOCK_ASSERT(_tcb) do { \
  341                             if (mtx_owned(&(_tcb)->tcb_mtx) == 0) \
  342                                 panic("Don't own TCB lock"); \
  343                             } while (0)
  344 #else
  345 #define SCTP_TCB_LOCK_ASSERT(_tcb)
  346 #endif
  347 
  348 #define SCTP_ITERATOR_LOCK_INIT() \
  349         mtx_init(&sctp_it_ctl.it_mtx, "sctp-it", "iterator", MTX_DEF)
  350 
  351 #ifdef INVARIANTS
  352 #define SCTP_ITERATOR_LOCK() \
  353         do {                                                            \
  354                 if (mtx_owned(&sctp_it_ctl.it_mtx))                     \
  355                         panic("Iterator Lock");                         \
  356                 mtx_lock(&sctp_it_ctl.it_mtx);                          \
  357         } while (0)
  358 #else
  359 #define SCTP_ITERATOR_LOCK() \
  360         do {                                                            \
  361                 mtx_lock(&sctp_it_ctl.it_mtx);                          \
  362         } while (0)
  363 
  364 #endif
  365 
  366 #define SCTP_ITERATOR_UNLOCK()          mtx_unlock(&sctp_it_ctl.it_mtx)
  367 #define SCTP_ITERATOR_LOCK_DESTROY()    mtx_destroy(&sctp_it_ctl.it_mtx)
  368 
  369 
  370 #define SCTP_WQ_ADDR_INIT() do { \
  371         mtx_init(&SCTP_BASE_INFO(wq_addr_mtx), "sctp-addr-wq","sctp_addr_wq",MTX_DEF); \
  372  } while (0)
  373 
  374 #define SCTP_WQ_ADDR_DESTROY() do  { \
  375         if(mtx_owned(&SCTP_BASE_INFO(wq_addr_mtx))) { \
  376              mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \
  377         } \
  378             mtx_destroy(&SCTP_BASE_INFO(wq_addr_mtx)); \
  379       }  while (0)
  380 
  381 #define SCTP_WQ_ADDR_LOCK()     do { \
  382              mtx_lock(&SCTP_BASE_INFO(wq_addr_mtx));  \
  383 } while (0)
  384 #define SCTP_WQ_ADDR_UNLOCK() do { \
  385                 mtx_unlock(&SCTP_BASE_INFO(wq_addr_mtx)); \
  386 } while (0)
  387 
  388 
  389 
  390 #define SCTP_INCR_EP_COUNT() \
  391                 do { \
  392                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
  393                 } while (0)
  394 
  395 #define SCTP_DECR_EP_COUNT() \
  396                 do { \
  397                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
  398                 } while (0)
  399 
  400 #define SCTP_INCR_ASOC_COUNT() \
  401                 do { \
  402                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
  403                 } while (0)
  404 
  405 #define SCTP_DECR_ASOC_COUNT() \
  406                 do { \
  407                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
  408                 } while (0)
  409 
  410 #define SCTP_INCR_LADDR_COUNT() \
  411                 do { \
  412                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
  413                 } while (0)
  414 
  415 #define SCTP_DECR_LADDR_COUNT() \
  416                 do { \
  417                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
  418                 } while (0)
  419 
  420 #define SCTP_INCR_RADDR_COUNT() \
  421                 do { \
  422                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_raddr), 1); \
  423                 } while (0)
  424 
  425 #define SCTP_DECR_RADDR_COUNT() \
  426                 do { \
  427                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_raddr),1); \
  428                 } while (0)
  429 
  430 #define SCTP_INCR_CHK_COUNT() \
  431                 do { \
  432                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  433                 } while (0)
  434 #ifdef INVARIANTS
  435 #define SCTP_DECR_CHK_COUNT() \
  436                 do { \
  437                        if(SCTP_BASE_INFO(ipi_count_chunk) == 0) \
  438                              panic("chunk count to 0?");    \
  439                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  440                 } while (0)
  441 #else
  442 #define SCTP_DECR_CHK_COUNT() \
  443                 do { \
  444                        if(SCTP_BASE_INFO(ipi_count_chunk) != 0) \
  445                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
  446                 } while (0)
  447 #endif
  448 #define SCTP_INCR_READQ_COUNT() \
  449                 do { \
  450                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_readq),1); \
  451                 } while (0)
  452 
  453 #define SCTP_DECR_READQ_COUNT() \
  454                 do { \
  455                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_readq), 1); \
  456                 } while (0)
  457 
  458 #define SCTP_INCR_STRMOQ_COUNT() \
  459                 do { \
  460                        atomic_add_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
  461                 } while (0)
  462 
  463 #define SCTP_DECR_STRMOQ_COUNT() \
  464                 do { \
  465                        atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
  466                 } while (0)
  467 
  468 
  469 #if defined(SCTP_SO_LOCK_TESTING)
  470 #define SCTP_INP_SO(sctpinp)    (sctpinp)->ip_inp.inp.inp_socket
  471 #define SCTP_SOCKET_LOCK(so, refcnt)
  472 #define SCTP_SOCKET_UNLOCK(so, refcnt)
  473 #endif
  474 
  475 #endif

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