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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
* Copyright (c) 2023, 2024, Klara Inc.
*/
#ifndef _ABD_IMPL_H
#define _ABD_IMPL_H
#include <sys/abd.h>
#include <sys/abd_impl_os.h>
#include <sys/wmsum.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef enum abd_stats_op {
ABDSTAT_INCR, /* Increase abdstat values */
ABDSTAT_DECR /* Decrease abdstat values */
} abd_stats_op_t;
/* forward declarations */
struct scatterlist;
struct page;
struct abd_iter {
/* public interface */
union {
/* for abd_iter_map()/abd_iter_unmap() */
struct {
/* addr corresponding to iter_pos */
void *iter_mapaddr;
/* length of data valid at mapaddr */
size_t iter_mapsize;
};
/* for abd_iter_page() */
struct {
/* current page */
struct page *iter_page;
/* offset of data in page */
size_t iter_page_doff;
/* size of data in page */
size_t iter_page_dsize;
};
};
/* private */
abd_t *iter_abd; /* ABD being iterated through */
size_t iter_pos;
size_t iter_offset; /* offset in current sg/abd_buf, */
/* abd_offset included */
struct scatterlist *iter_sg; /* current sg */
};
extern abd_t *abd_zero_scatter;
abd_t *abd_gang_get_offset(abd_t *, size_t *);
abd_t *abd_alloc_struct(size_t);
void abd_free_struct(abd_t *);
/*
* OS specific functions
*/
abd_t *abd_alloc_struct_impl(size_t);
abd_t *abd_get_offset_scatter(abd_t *, abd_t *, size_t, size_t);
void abd_free_struct_impl(abd_t *);
void abd_alloc_chunks(abd_t *, size_t);
void abd_free_chunks(abd_t *);
void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
void abd_update_linear_stats(abd_t *, abd_stats_op_t);
void abd_verify_scatter(abd_t *);
void abd_free_linear_page(abd_t *);
/* OS specific abd_iter functions */
void abd_iter_init(struct abd_iter *, abd_t *);
boolean_t abd_iter_at_end(struct abd_iter *);
void abd_iter_advance(struct abd_iter *, size_t);
void abd_iter_map(struct abd_iter *);
void abd_iter_unmap(struct abd_iter *);
void abd_iter_page(struct abd_iter *);
/*
* Helper macros
*/
#define ABDSTAT_INCR(stat, val) \
wmsum_add(&abd_sums.stat, (val))
#define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1)
#define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1)
#define ABD_SCATTER(abd) (abd->abd_u.abd_scatter)
#define ABD_LINEAR_BUF(abd) (abd->abd_u.abd_linear.abd_buf)
#define ABD_GANG(abd) (abd->abd_u.abd_gang)
#ifdef __cplusplus
}
#endif
#endif /* _ABD_IMPL_H */
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