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