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e949d36040
The assertions are racy and the use of `membar_exit()` did nothing to fix that. The helpers use atomic functions, so we cleverly get values from the atomics that we can use to ensure that the assertions operate on the correct values. We also use `membar_producer()` prior to decrementing reference counts so that operations that happened prior to a decrement to 0 will be guaranteed to happen before the decrement on architectures that reorder atomics. This also slightly improves performance by eliminating unnecessary reads, although I doubt it would be measurable in any benchmark. Reviewed-by: Mateusz Guzik <mjguzik@gmail.com> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #13880
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_CRYPTO_SCHED_IMPL_H
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#define _SYS_CRYPTO_SCHED_IMPL_H
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/*
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* Scheduler internal structures.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/zfs_context.h>
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#include <sys/crypto/api.h>
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#include <sys/crypto/spi.h>
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#include <sys/crypto/impl.h>
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#include <sys/crypto/common.h>
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typedef struct kcf_prov_tried {
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kcf_provider_desc_t *pt_pd;
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struct kcf_prov_tried *pt_next;
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} kcf_prov_tried_t;
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#define IS_FG_SUPPORTED(mdesc, fg) \
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(((mdesc)->pm_mech_info.cm_func_group_mask & (fg)) != 0)
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#define IS_PROVIDER_TRIED(pd, tlist) \
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(tlist != NULL && is_in_triedlist(pd, tlist))
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#define IS_RECOVERABLE(error) \
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(error == CRYPTO_BUSY || \
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error == CRYPTO_KEY_SIZE_RANGE)
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/*
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* Internal representation of a canonical context. We contain crypto_ctx_t
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* structure in order to have just one memory allocation. The SPI
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* ((crypto_ctx_t *)ctx)->cc_framework_private maps to this structure.
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*/
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typedef struct kcf_context {
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crypto_ctx_t kc_glbl_ctx;
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uint_t kc_refcnt;
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kcf_provider_desc_t *kc_prov_desc; /* Prov. descriptor */
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kcf_provider_desc_t *kc_sw_prov_desc; /* Prov. descriptor */
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} kcf_context_t;
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/*
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* Decrement the reference count on the framework private context.
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* When the last reference is released, the framework private
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* context structure is freed along with the global context.
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*/
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#define KCF_CONTEXT_REFRELE(ictx) { \
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membar_producer(); \
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int newval = atomic_add_32_nv(&(ictx)->kc_refcnt, -1); \
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ASSERT(newval != -1); \
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if (newval == 0) \
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kcf_free_context(ictx); \
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}
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/*
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* Check if we can release the context now. In case of CRYPTO_BUSY,
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* the client can retry the request using the context,
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* so we do not release the context.
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*
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* This macro should be called only from the final routine in
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* an init/update/final sequence. We do not release the context in case
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* of update operations. We require the consumer to free it
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* explicitly, in case it wants to abandon the operation. This is done
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* as there may be mechanisms in ECB mode that can continue even if
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* an operation on a block fails.
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*/
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#define KCF_CONTEXT_COND_RELEASE(rv, kcf_ctx) { \
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if (KCF_CONTEXT_DONE(rv)) \
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KCF_CONTEXT_REFRELE(kcf_ctx); \
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}
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/*
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* This macro determines whether we're done with a context.
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*/
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#define KCF_CONTEXT_DONE(rv) \
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((rv) != CRYPTO_BUSY && (rv) != CRYPTO_BUFFER_TOO_SMALL)
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#define KCF_SET_PROVIDER_MECHNUM(fmtype, pd, mechp) \
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(mechp)->cm_type = \
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KCF_TO_PROV_MECHNUM(pd, fmtype);
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/*
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* A crypto_ctx_template_t is internally a pointer to this struct
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*/
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typedef struct kcf_ctx_template {
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size_t ct_size; /* for freeing */
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crypto_spi_ctx_template_t ct_prov_tmpl; /* context template */
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/* from the provider */
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} kcf_ctx_template_t;
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extern void kcf_free_triedlist(kcf_prov_tried_t *);
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extern kcf_prov_tried_t *kcf_insert_triedlist(kcf_prov_tried_t **,
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kcf_provider_desc_t *, int);
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extern kcf_provider_desc_t *kcf_get_mech_provider(crypto_mech_type_t,
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kcf_mech_entry_t **, int *, kcf_prov_tried_t *, crypto_func_group_t);
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extern crypto_ctx_t *kcf_new_ctx(kcf_provider_desc_t *);
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extern void kcf_sched_destroy(void);
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extern void kcf_sched_init(void);
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extern void kcf_free_context(kcf_context_t *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_CRYPTO_SCHED_IMPL_H */
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