projects / mirror_frr.git / blame
| Commit | Line | Data |
|---|---|---|
| acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| a94eca09 MS |
2 | /* |
| 3 | * FRR ID Number Allocator | |
| 4 | * Copyright (C) 2018 Amazon.com, Inc. or its affiliates | |
| a94eca09 MS |
5 | */ |
| 6 | ||
| 7 | #ifndef _ZEBRA_ID_ALLOC_H | |
| 8 | #define _ZEBRA_ID_ALLOC_H | |
| 9 | ||
| 10 | #include <strings.h> | |
| 11 | #include <limits.h> | |
| 12 | #include <stdint.h> | |
| 13 | ||
| 5e244469 RW |
14 | #ifdef __cplusplus |
| 15 | extern "C" { | |
| 16 | #endif | |
| 17 | ||
| a94eca09 MS |
18 | #define IDALLOC_INVALID 0 |
| 19 | ||
| 20 | #define IDALLOC_DIR_BITS 8 | |
| 21 | #define IDALLOC_SUBDIR_BITS 7 | |
| 22 | #define IDALLOC_PAGE_BITS 7 | |
| 23 | #define IDALLOC_WORD_BITS 5 | |
| 24 | #define IDALLOC_OFFSET_BITS 5 | |
| 25 | ||
| 26 | #define IDALLOC_DIR_COUNT (1 << IDALLOC_DIR_BITS) | |
| 27 | #define IDALLOC_SUBDIR_COUNT (1 << IDALLOC_SUBDIR_BITS) | |
| 28 | #define IDALLOC_PAGE_COUNT (1 << IDALLOC_PAGE_BITS) | |
| 29 | #define IDALLOC_WORD_COUNT (1 << IDALLOC_WORD_BITS) | |
| 30 | ||
| 31 | struct id_alloc_page { | |
| 32 | /* Bitmask of allocations. 1s indicates the ID is already allocated. */ | |
| 33 | uint32_t allocated_mask[IDALLOC_WORD_COUNT]; | |
| 34 | ||
| 35 | /* Bitmask for free space in allocated_mask. 1s indicate whole 32 bit | |
| 36 | * section is full. | |
| 37 | */ | |
| 38 | uint32_t full_word_mask; | |
| 39 | ||
| 40 | /* The ID that bit 0 in allocated_mask corresponds to. */ | |
| 41 | uint32_t base_value; | |
| 42 | ||
| 43 | struct id_alloc_page | |
| 44 | *next_has_free; /* Next page with at least one bit open */ | |
| 45 | }; | |
| 46 | ||
| 47 | struct id_alloc_subdir { | |
| 48 | struct id_alloc_page *sublevels[IDALLOC_PAGE_COUNT]; | |
| 49 | }; | |
| 50 | ||
| 51 | struct id_alloc_dir { | |
| 52 | struct id_alloc_subdir *sublevels[IDALLOC_SUBDIR_COUNT]; | |
| 53 | }; | |
| 54 | ||
| 55 | struct id_alloc { | |
| 56 | struct id_alloc_dir *sublevels[IDALLOC_DIR_COUNT]; | |
| 57 | ||
| 58 | struct id_alloc_page *has_free; | |
| 59 | ||
| 60 | char *name; | |
| 61 | ||
| 62 | uint32_t allocated, capacity; | |
| 63 | }; | |
| 64 | ||
| 65 | struct id_alloc_pool { | |
| 66 | struct id_alloc_pool *next; | |
| 67 | uint32_t id; | |
| 68 | }; | |
| 69 | ||
| 70 | void idalloc_free(struct id_alloc *alloc, uint32_t id); | |
| 71 | void idalloc_free_to_pool(struct id_alloc_pool **pool_ptr, uint32_t id); | |
| 72 | void idalloc_drain_pool(struct id_alloc *alloc, | |
| 73 | struct id_alloc_pool **pool_ptr); | |
| 74 | uint32_t idalloc_allocate(struct id_alloc *alloc); | |
| 75 | uint32_t idalloc_allocate_prefer_pool(struct id_alloc *alloc, | |
| 76 | struct id_alloc_pool **pool_ptr); | |
| 77 | uint32_t idalloc_reserve(struct id_alloc *alloc, uint32_t id); | |
| 78 | struct id_alloc *idalloc_new(const char *name); | |
| 79 | void idalloc_destroy(struct id_alloc *alloc); | |
| 80 | ||
| 5e244469 RW |
81 | #ifdef __cplusplus |
| 82 | } | |
| 83 | #endif | |
| 84 | ||
| a94eca09 | 85 | #endif |