1 #ifndef __sctp_lock_bsd_h__
2 #define __sctp_lock_bsd_h__
4 * Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved.
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7 * modification, are permitted provided that the following conditions are met:
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14 * the documentation and/or other materials provided with the distribution.
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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34 * General locking concepts: The goal of our locking is to of course provide
35 * consistency and yet minimize overhead. We will attempt to use
36 * non-recursive locks which are supposed to be quite inexpensive. Now in
37 * order to do this the goal is that most functions are not aware of locking.
38 * Once we have a TCB we lock it and unlock when we are through. This means
39 * that the TCB lock is kind-of a "global" lock when working on an
40 * association. Caution must be used when asserting a TCB_LOCK since if we
41 * recurse we deadlock.
43 * Most other locks (INP and INFO) attempt to localize the locking i.e. we try
44 * to contain the lock and unlock within the function that needs to lock it.
45 * This sometimes mean we do extra locks and unlocks and lose a bit of
46 * efficency, but if the performance statements about non-recursive locks are
47 * true this should not be a problem. One issue that arises with this only
48 * lock when needed is that if an implicit association setup is done we have
49 * a problem. If at the time I lookup an association I have NULL in the tcb
50 * return, by the time I call to create the association some other processor
51 * could have created it. This is what the CREATE lock on the endpoint.
52 * Places where we will be implicitly creating the association OR just
53 * creating an association (the connect call) will assert the CREATE_INP
54 * lock. This will assure us that during all the lookup of INP and INFO if
55 * another creator is also locking/looking up we can gate the two to
56 * synchronize. So the CREATE_INP lock is also another one we must use
57 * extreme caution in locking to make sure we don't hit a re-entrancy issue.
59 * For non FreeBSD 5.x we provide a bunch of EMPTY lock macros so we can
60 * blatantly put locks everywhere and they reduce to nothing on
61 * NetBSD/OpenBSD and FreeBSD 4.x
66 * When working with the global SCTP lists we lock and unlock the INP_INFO
67 * lock. So when we go to lookup an association we will want to do a
68 * SCTP_INP_INFO_RLOCK() and then when we want to add a new association to
69 * the sctppcbinfo list's we will do a SCTP_INP_INFO_WLOCK().
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
75 extern struct sctp_foo_stuff sctp_logoff[];
76 extern int sctp_logoff_stuff;
78 #define SCTP_IPI_COUNT_INIT()
80 #define SCTP_STATLOG_INIT_LOCK()
81 #define SCTP_STATLOG_LOCK()
82 #define SCTP_STATLOG_UNLOCK()
83 #define SCTP_STATLOG_DESTROY()
85 #define SCTP_STATLOG_GETREF(x) { \
86 x = atomic_fetchadd_int(&global_sctp_cwnd_log_at, 1); \
87 if(x == SCTP_STAT_LOG_SIZE) { \
88 global_sctp_cwnd_log_at = 1; \
90 global_sctp_cwnd_log_rolled = 1; \
95 #define SCTP_INP_INFO_LOCK_INIT() \
96 mtx_init(&sctppcbinfo.ipi_ep_mtx, "sctp-info", "inp_info", MTX_DEF)
99 #define SCTP_INP_INFO_RLOCK() do { \
100 mtx_lock(&sctppcbinfo.ipi_ep_mtx); \
104 #define SCTP_INP_INFO_WLOCK() do { \
105 mtx_lock(&sctppcbinfo.ipi_ep_mtx); \
109 #define SCTP_IPI_ADDR_INIT() \
110 mtx_init(&sctppcbinfo.ipi_addr_mtx, "sctp-addr", "sctp_addr", MTX_DEF)
112 #define SCTP_IPI_ADDR_DESTROY() \
113 mtx_destroy(&sctppcbinfo.ipi_addr_mtx)
115 #define SCTP_IPI_ADDR_LOCK() do { \
116 mtx_lock(&sctppcbinfo.ipi_addr_mtx); \
119 #define SCTP_IPI_ADDR_UNLOCK() mtx_unlock(&sctppcbinfo.ipi_addr_mtx)
123 #define SCTP_IPI_ITERATOR_WQ_INIT() \
124 mtx_init(&sctppcbinfo.ipi_iterator_wq_mtx, "sctp-it-wq", "sctp_it_wq", MTX_DEF)
126 #define SCTP_IPI_ITERATOR_WQ_DESTROY() \
127 mtx_destroy(&sctppcbinfo.ipi_iterator_wq_mtx)
129 #define SCTP_IPI_ITERATOR_WQ_LOCK() do { \
130 mtx_lock(&sctppcbinfo.ipi_iterator_wq_mtx); \
133 #define SCTP_IPI_ITERATOR_WQ_UNLOCK() mtx_unlock(&sctppcbinfo.ipi_iterator_wq_mtx)
139 #define SCTP_INP_INFO_RUNLOCK() mtx_unlock(&sctppcbinfo.ipi_ep_mtx)
140 #define SCTP_INP_INFO_WUNLOCK() mtx_unlock(&sctppcbinfo.ipi_ep_mtx)
143 * The INP locks we will use for locking an SCTP endpoint, so for example if
144 * we want to change something at the endpoint level for example random_store
145 * or cookie secrets we lock the INP level.
148 #define SCTP_INP_READ_INIT(_inp) \
149 mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", MTX_DEF | MTX_DUPOK)
151 #define SCTP_INP_READ_DESTROY(_inp) \
152 mtx_destroy(&(_inp)->inp_rdata_mtx)
154 #define SCTP_INP_READ_LOCK(_inp) do { \
155 mtx_lock(&(_inp)->inp_rdata_mtx); \
159 #define SCTP_INP_READ_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_rdata_mtx)
162 #define SCTP_INP_LOCK_INIT(_inp) \
163 mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", MTX_DEF | MTX_DUPOK)
164 #define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
165 mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \
168 #define SCTP_INP_LOCK_DESTROY(_inp) \
169 mtx_destroy(&(_inp)->inp_mtx)
171 #define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) \
172 mtx_destroy(&(_inp)->inp_create_mtx)
175 #ifdef SCTP_LOCK_LOGGING
176 #define SCTP_INP_RLOCK(_inp) do { \
177 sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
178 mtx_lock(&(_inp)->inp_mtx); \
181 #define SCTP_INP_WLOCK(_inp) do { \
182 sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
183 mtx_lock(&(_inp)->inp_mtx); \
188 #define SCTP_INP_RLOCK(_inp) do { \
189 mtx_lock(&(_inp)->inp_mtx); \
192 #define SCTP_INP_WLOCK(_inp) do { \
193 mtx_lock(&(_inp)->inp_mtx); \
199 #define SCTP_TCB_SEND_LOCK_INIT(_tcb) \
200 mtx_init(&(_tcb)->tcb_send_mtx, "sctp-send-tcb", "tcbs", MTX_DEF | MTX_DUPOK)
202 #define SCTP_TCB_SEND_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_send_mtx)
204 #define SCTP_TCB_SEND_LOCK(_tcb) do { \
205 mtx_lock(&(_tcb)->tcb_send_mtx); \
208 #define SCTP_TCB_SEND_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_send_mtx)
210 #define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1)
211 #define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1)
214 #ifdef SCTP_LOCK_LOGGING
215 #define SCTP_ASOC_CREATE_LOCK(_inp) \
217 sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_CREATE); \
218 mtx_lock(&(_inp)->inp_create_mtx); \
222 #define SCTP_ASOC_CREATE_LOCK(_inp) \
224 mtx_lock(&(_inp)->inp_create_mtx); \
228 #define SCTP_INP_RUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx)
229 #define SCTP_INP_WUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx)
230 #define SCTP_ASOC_CREATE_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_create_mtx)
233 * For the majority of things (once we have found the association) we will
234 * lock the actual association mutex. This will protect all the assoiciation
235 * level queues and streams and such. We will need to lock the socket layer
236 * when we stuff data up into the receiving sb_mb. I.e. we will need to do an
237 * extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked.
240 #define SCTP_TCB_LOCK_INIT(_tcb) \
241 mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", MTX_DEF | MTX_DUPOK)
243 #define SCTP_TCB_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_mtx)
245 #ifdef SCTP_LOCK_LOGGING
246 #define SCTP_TCB_LOCK(_tcb) do { \
247 sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB); \
248 mtx_lock(&(_tcb)->tcb_mtx); \
252 #define SCTP_TCB_LOCK(_tcb) do { \
253 mtx_lock(&(_tcb)->tcb_mtx); \
259 #define SCTP_TCB_TRYLOCK(_tcb) mtx_trylock(&(_tcb)->tcb_mtx)
261 #define SCTP_TCB_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_mtx)
263 #define SCTP_TCB_UNLOCK_IFOWNED(_tcb) do { \
264 if (mtx_owned(&(_tcb)->tcb_mtx)) \
265 mtx_unlock(&(_tcb)->tcb_mtx); \
271 #define SCTP_TCB_LOCK_ASSERT(_tcb) do { \
272 if (mtx_owned(&(_tcb)->tcb_mtx) == 0) \
273 panic("Don't own TCB lock"); \
276 #define SCTP_TCB_LOCK_ASSERT(_tcb)
279 #define SCTP_ITERATOR_LOCK_INIT() \
280 mtx_init(&sctppcbinfo.it_mtx, "sctp-it", "iterator", MTX_DEF)
283 #define SCTP_ITERATOR_LOCK() \
285 if (mtx_owned(&sctppcbinfo.it_mtx)) \
286 panic("Iterator Lock"); \
287 mtx_lock(&sctppcbinfo.it_mtx); \
290 #define SCTP_ITERATOR_LOCK() \
292 mtx_lock(&sctppcbinfo.it_mtx); \
297 #define SCTP_ITERATOR_UNLOCK() mtx_unlock(&sctppcbinfo.it_mtx)
298 #define SCTP_ITERATOR_LOCK_DESTROY() mtx_destroy(&sctppcbinfo.it_mtx)
301 #define SCTP_INCR_EP_COUNT() \
303 atomic_add_int(&sctppcbinfo.ipi_count_ep, 1); \
306 #define SCTP_DECR_EP_COUNT() \
308 atomic_add_int(&sctppcbinfo.ipi_count_ep,-1); \
311 #define SCTP_INCR_ASOC_COUNT() \
313 atomic_add_int(&sctppcbinfo.ipi_count_asoc, 1); \
316 #define SCTP_DECR_ASOC_COUNT() \
318 atomic_add_int(&sctppcbinfo.ipi_count_asoc, -1); \
321 #define SCTP_INCR_LADDR_COUNT() \
323 atomic_add_int(&sctppcbinfo.ipi_count_laddr, 1); \
326 #define SCTP_DECR_LADDR_COUNT() \
328 atomic_add_int(&sctppcbinfo.ipi_count_laddr, -1); \
331 #define SCTP_INCR_RADDR_COUNT() \
333 atomic_add_int(&sctppcbinfo.ipi_count_raddr,1); \
336 #define SCTP_DECR_RADDR_COUNT() \
338 atomic_add_int(&sctppcbinfo.ipi_count_raddr,-1); \
341 #define SCTP_INCR_CHK_COUNT() \
343 atomic_add_int(&sctppcbinfo.ipi_count_chunk, 1); \
346 #define SCTP_DECR_CHK_COUNT() \
348 if(sctppcbinfo.ipi_count_chunk == 0) \
349 panic("chunk count to 0?"); \
350 atomic_add_int(&sctppcbinfo.ipi_count_chunk,-1); \
353 #define SCTP_INCR_READQ_COUNT() \
355 atomic_add_int(&sctppcbinfo.ipi_count_readq,1); \
358 #define SCTP_DECR_READQ_COUNT() \
360 atomic_add_int(&sctppcbinfo.ipi_count_readq, -1); \
363 #define SCTP_INCR_STRMOQ_COUNT() \
365 atomic_add_int(&sctppcbinfo.ipi_count_strmoq, 1); \
368 #define SCTP_DECR_STRMOQ_COUNT() \
370 atomic_add_int(&sctppcbinfo.ipi_count_strmoq,-1); \