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Diffstat (limited to 'sys/netinet/sctp_lock_bsd.h')
| -rw-r--r-- | sys/netinet/sctp_lock_bsd.h | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/sys/netinet/sctp_lock_bsd.h b/sys/netinet/sctp_lock_bsd.h new file mode 100644 index 0000000..4cab124 --- /dev/null +++ b/sys/netinet/sctp_lock_bsd.h @@ -0,0 +1,355 @@ +#ifndef __sctp_lock_bsd_h__ +#define __sctp_lock_bsd_h__ +/*- + * Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * a) Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * b) 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. + * + * c) Neither the name of Cisco Systems, Inc. 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. + */ + +/* + * General locking concepts: The goal of our locking is to of course provide + * consistency and yet minimize overhead. We will attempt to use + * non-recursive locks which are supposed to be quite inexpensive. Now in + * order to do this the goal is that most functions are not aware of locking. + * Once we have a TCB we lock it and unlock when we are through. This means + * that the TCB lock is kind-of a "global" lock when working on an + * association. Caution must be used when asserting a TCB_LOCK since if we + * recurse we deadlock. + * + * Most other locks (INP and INFO) attempt to localize the locking i.e. we try + * to contain the lock and unlock within the function that needs to lock it. + * This sometimes mean we do extra locks and unlocks and lose a bit of + * efficency, but if the performance statements about non-recursive locks are + * true this should not be a problem. One issue that arises with this only + * lock when needed is that if an implicit association setup is done we have + * a problem. If at the time I lookup an association I have NULL in the tcb + * return, by the time I call to create the association some other processor + * could have created it. This is what the CREATE lock on the endpoint. + * Places where we will be implicitly creating the association OR just + * creating an association (the connect call) will assert the CREATE_INP + * lock. This will assure us that during all the lookup of INP and INFO if + * another creator is also locking/looking up we can gate the two to + * synchronize. So the CREATE_INP lock is also another one we must use + * extreme caution in locking to make sure we don't hit a re-entrancy issue. + * + * For non FreeBSD 5.x we provide a bunch of EMPTY lock macros so we can + * blatantly put locks everywhere and they reduce to nothing on + * NetBSD/OpenBSD and FreeBSD 4.x + * + */ + +/* + * When working with the global SCTP lists we lock and unlock the INP_INFO + * lock. So when we go to lookup an association we will want to do a + * SCTP_INP_INFO_RLOCK() and then when we want to add a new association to + * the sctppcbinfo list's we will do a SCTP_INP_INFO_WLOCK(). + */ + +__FBSDID("$FreeBSD$"); + +#define SCTP_IPI_COUNT_INIT() + +#define SCTP_STATLOG_INIT_LOCK() +#define SCTP_STATLOG_LOCK() +#define SCTP_STATLOG_UNLOCK() +#define SCTP_STATLOG_DESTROY() + +#define SCTP_STATLOG_GETREF(x) { \ + x = atomic_fetchadd_int(&global_sctp_cwnd_log_at, 1); \ + if(x == SCTP_STAT_LOG_SIZE) { \ + global_sctp_cwnd_log_at = 1; \ + x = 0; \ + global_sctp_cwnd_log_rolled = 1; \ + } \ +} + +#define SCTP_INP_INFO_LOCK_INIT() \ + mtx_init(&sctppcbinfo.ipi_ep_mtx, "sctp-info", "inp_info", MTX_DEF) + + +#define SCTP_INP_INFO_RLOCK() do { \ + mtx_lock(&sctppcbinfo.ipi_ep_mtx); \ +} while (0) + + +#define SCTP_INP_INFO_WLOCK() do { \ + mtx_lock(&sctppcbinfo.ipi_ep_mtx); \ +} while (0) + + + +#define SCTP_IPI_ADDR_INIT() \ + mtx_init(&sctppcbinfo.ipi_addr_mtx, "sctp-addr-wq", "sctp_addr_wq", MTX_DEF) + +#define SCTP_IPI_ADDR_DESTROY() \ + mtx_destroy(&sctppcbinfo.ipi_addr_mtx) + +#define SCTP_IPI_ADDR_LOCK() do { \ + mtx_lock(&sctppcbinfo.ipi_addr_mtx); \ +} while (0) + +#define SCTP_IPI_ADDR_UNLOCK() mtx_unlock(&sctppcbinfo.ipi_addr_mtx) + +#define SCTP_INP_INFO_RUNLOCK() mtx_unlock(&sctppcbinfo.ipi_ep_mtx) +#define SCTP_INP_INFO_WUNLOCK() mtx_unlock(&sctppcbinfo.ipi_ep_mtx) + +/* + * The INP locks we will use for locking an SCTP endpoint, so for example if + * we want to change something at the endpoint level for example random_store + * or cookie secrets we lock the INP level. + */ + +#define SCTP_INP_READ_INIT(_inp) \ + mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", MTX_DEF | MTX_DUPOK) + +#define SCTP_INP_READ_DESTROY(_inp) \ + mtx_destroy(&(_inp)->inp_rdata_mtx) + +#define SCTP_INP_READ_LOCK(_inp) do { \ + mtx_lock(&(_inp)->inp_rdata_mtx); \ +} while (0) + + +#define SCTP_INP_READ_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_rdata_mtx) + + +#define SCTP_INP_LOCK_INIT(_inp) \ + mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", MTX_DEF | MTX_DUPOK) +#define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \ + mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \ + MTX_DEF | MTX_DUPOK) + +#define SCTP_INP_LOCK_DESTROY(_inp) \ + mtx_destroy(&(_inp)->inp_mtx) + +#define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) \ + mtx_destroy(&(_inp)->inp_create_mtx) + + +#ifdef SCTP_LOCK_LOGGING +#define SCTP_INP_RLOCK(_inp) do { \ + sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\ + mtx_lock(&(_inp)->inp_mtx); \ +} while (0) + +#define SCTP_INP_WLOCK(_inp) do { \ + sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\ + mtx_lock(&(_inp)->inp_mtx); \ +} while (0) + +#else + +#define SCTP_INP_RLOCK(_inp) do { \ + mtx_lock(&(_inp)->inp_mtx); \ +} while (0) + +#define SCTP_INP_WLOCK(_inp) do { \ + mtx_lock(&(_inp)->inp_mtx); \ +} while (0) + +#endif + + +#define SCTP_TCB_SEND_LOCK_INIT(_tcb) \ + mtx_init(&(_tcb)->tcb_send_mtx, "sctp-send-tcb", "tcbs", MTX_DEF | MTX_DUPOK) + +#define SCTP_TCB_SEND_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_send_mtx) + +#define SCTP_TCB_SEND_LOCK(_tcb) do { \ + mtx_lock(&(_tcb)->tcb_send_mtx); \ +} while (0) + +#define SCTP_TCB_SEND_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_send_mtx) + + +#define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1) +#define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1) + +#ifdef SCTP_LOCK_LOGGING +#define SCTP_ASOC_CREATE_LOCK(_inp) \ + do { \ + sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_CREATE); \ + mtx_lock(&(_inp)->inp_create_mtx); \ + } while (0) +#else + +#define SCTP_ASOC_CREATE_LOCK(_inp) \ + do { \ + mtx_lock(&(_inp)->inp_create_mtx); \ + } while (0) +#endif + +#define SCTP_INP_RUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx) +#define SCTP_INP_WUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx) +#define SCTP_ASOC_CREATE_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_create_mtx) + +/* + * For the majority of things (once we have found the association) we will + * lock the actual association mutex. This will protect all the assoiciation + * level queues and streams and such. We will need to lock the socket layer + * when we stuff data up into the receiving sb_mb. I.e. we will need to do an + * extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked. + */ + +#define SCTP_TCB_LOCK_INIT(_tcb) \ + mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", MTX_DEF | MTX_DUPOK) + +#define SCTP_TCB_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_mtx) + +#ifdef SCTP_LOCK_LOGGING +#define SCTP_TCB_LOCK(_tcb) do { \ + sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB); \ + mtx_lock(&(_tcb)->tcb_mtx); \ +} while (0) + +#else +#define SCTP_TCB_LOCK(_tcb) do { \ + mtx_lock(&(_tcb)->tcb_mtx); \ +} while (0) + +#endif + + +#define SCTP_TCB_TRYLOCK(_tcb) mtx_trylock(&(_tcb)->tcb_mtx) + +#define SCTP_TCB_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_mtx) + +#define SCTP_TCB_UNLOCK_IFOWNED(_tcb) do { \ + if (mtx_owned(&(_tcb)->tcb_mtx)) \ + mtx_unlock(&(_tcb)->tcb_mtx); \ + } while (0) + + + +#ifdef INVARIANTS +#define SCTP_TCB_LOCK_ASSERT(_tcb) do { \ + if (mtx_owned(&(_tcb)->tcb_mtx) == 0) \ + panic("Don't own TCB lock"); \ + } while (0) +#else +#define SCTP_TCB_LOCK_ASSERT(_tcb) +#endif + +#define SCTP_ITERATOR_LOCK_INIT() \ + mtx_init(&sctppcbinfo.it_mtx, "sctp-it", "iterator", MTX_DEF) + +#ifdef INVARIANTS +#define SCTP_ITERATOR_LOCK() \ + do { \ + if (mtx_owned(&sctppcbinfo.it_mtx)) \ + panic("Iterator Lock"); \ + mtx_lock(&sctppcbinfo.it_mtx); \ + } while (0) +#else +#define SCTP_ITERATOR_LOCK() \ + do { \ + mtx_lock(&sctppcbinfo.it_mtx); \ + } while (0) + +#endif + +#define SCTP_ITERATOR_UNLOCK() mtx_unlock(&sctppcbinfo.it_mtx) +#define SCTP_ITERATOR_LOCK_DESTROY() mtx_destroy(&sctppcbinfo.it_mtx) + + +#define SCTP_INCR_EP_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_ep, 1); \ + } while (0) + +#define SCTP_DECR_EP_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_ep,-1); \ + } while (0) + +#define SCTP_INCR_ASOC_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_asoc, 1); \ + } while (0) + +#define SCTP_DECR_ASOC_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_asoc, -1); \ + } while (0) + +#define SCTP_INCR_LADDR_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_laddr, 1); \ + } while (0) + +#define SCTP_DECR_LADDR_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_laddr, -1); \ + } while (0) + +#define SCTP_INCR_RADDR_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_raddr,1); \ + } while (0) + +#define SCTP_DECR_RADDR_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_raddr,-1); \ + } while (0) + +#define SCTP_INCR_CHK_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_chunk, 1); \ + } while (0) + +#define SCTP_DECR_CHK_COUNT() \ + do { \ + if(sctppcbinfo.ipi_count_chunk == 0) \ + panic("chunk count to 0?"); \ + atomic_add_int(&sctppcbinfo.ipi_count_chunk,-1); \ + } while (0) + +#define SCTP_INCR_READQ_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_readq,1); \ + } while (0) + +#define SCTP_DECR_READQ_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_readq, -1); \ + } while (0) + +#define SCTP_INCR_STRMOQ_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_strmoq, 1); \ + } while (0) + +#define SCTP_DECR_STRMOQ_COUNT() \ + do { \ + atomic_add_int(&sctppcbinfo.ipi_count_strmoq,-1); \ + } while (0) + + + + + +#endif |
