| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* Copyright (C) 2024 Intel Corporation */ |
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| 3 | |
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| 4 | #ifndef __LIBETH_CACHE_H |
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| 5 | #define __LIBETH_CACHE_H |
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| 6 | |
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| 7 | #include <linux/cache.h> |
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| 8 | |
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| 9 | /** |
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| 10 | * libeth_cacheline_group_assert - make sure cacheline group size is expected |
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| 11 | * @type: type of the structure containing the group |
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| 12 | * @grp: group name inside the struct |
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| 13 | * @sz: expected group size |
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| 14 | */ |
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| 15 | #if defined(CONFIG_64BIT) && SMP_CACHE_BYTES == 64 |
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| 16 | #define libeth_cacheline_group_assert(type, grp, sz) \ |
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| 17 | static_assert(offsetof(type, __cacheline_group_end__##grp) - \ |
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| 18 | offsetofend(type, __cacheline_group_begin__##grp) == \ |
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| 19 | (sz)) |
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| 20 | #define __libeth_cacheline_struct_assert(type, sz) \ |
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| 21 | static_assert(sizeof(type) == (sz)) |
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| 22 | #else /* !CONFIG_64BIT || SMP_CACHE_BYTES != 64 */ |
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| 23 | #define libeth_cacheline_group_assert(type, grp, sz) \ |
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| 24 | static_assert(offsetof(type, __cacheline_group_end__##grp) - \ |
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| 25 | offsetofend(type, __cacheline_group_begin__##grp) <= \ |
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| 26 | (sz)) |
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| 27 | #define __libeth_cacheline_struct_assert(type, sz) \ |
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| 28 | static_assert(sizeof(type) <= (sz)) |
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| 29 | #endif /* !CONFIG_64BIT || SMP_CACHE_BYTES != 64 */ |
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| 30 | |
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| 31 | #define __libeth_cls1(sz1) SMP_CACHE_ALIGN(sz1) |
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| 32 | #define __libeth_cls2(sz1, sz2) (SMP_CACHE_ALIGN(sz1) + SMP_CACHE_ALIGN(sz2)) |
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| 33 | #define __libeth_cls3(sz1, sz2, sz3) \ |
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| 34 | (SMP_CACHE_ALIGN(sz1) + SMP_CACHE_ALIGN(sz2) + SMP_CACHE_ALIGN(sz3)) |
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| 35 | #define __libeth_cls(...) \ |
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| 36 | CONCATENATE(__libeth_cls, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) |
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| 37 | |
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| 38 | /** |
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| 39 | * libeth_cacheline_struct_assert - make sure CL-based struct size is expected |
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| 40 | * @type: type of the struct |
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| 41 | * @...: from 1 to 3 CL group sizes (read-mostly, read-write, cold) |
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| 42 | * |
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| 43 | * When a struct contains several CL groups, it's difficult to predict its size |
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| 44 | * on different architectures. The macro instead takes sizes of all of the |
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| 45 | * groups the structure contains and generates the final struct size. |
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| 46 | */ |
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| 47 | #define libeth_cacheline_struct_assert(type, ...) \ |
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| 48 | __libeth_cacheline_struct_assert(type, __libeth_cls(__VA_ARGS__)); \ |
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| 49 | static_assert(__alignof(type) >= SMP_CACHE_BYTES) |
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| 50 | |
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| 51 | /** |
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| 52 | * libeth_cacheline_set_assert - make sure CL-based struct layout is expected |
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| 53 | * @type: type of the struct |
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| 54 | * @ro: expected size of the read-mostly group |
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| 55 | * @rw: expected size of the read-write group |
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| 56 | * @c: expected size of the cold group |
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| 57 | * |
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| 58 | * Check that each group size is expected and then do final struct size check. |
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| 59 | */ |
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| 60 | #define libeth_cacheline_set_assert(type, ro, rw, c) \ |
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| 61 | libeth_cacheline_group_assert(type, read_mostly, ro); \ |
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| 62 | libeth_cacheline_group_assert(type, read_write, rw); \ |
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| 63 | libeth_cacheline_group_assert(type, cold, c); \ |
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| 64 | libeth_cacheline_struct_assert(type, ro, rw, c) |
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| 65 | |
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| 66 | #endif /* __LIBETH_CACHE_H */ |
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| 67 | |
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