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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667/* SPDX-License-Identifier: GPL-2.0-only *//* Copyright (C) 2024 Intel Corporation */
#ifndef __LIBETH_CACHE_H#define __LIBETH_CACHE_H
#include <linux/cache.h>
/** * libeth_cacheline_group_assert - make sure cacheline group size is expected * @type: type of the structure containing the group * @grp: group name inside the struct * @sz: expected group size */#if defined(CONFIG_64BIT) && SMP_CACHE_BYTES == 64#define libeth_cacheline_group_assert(type, grp, sz) \ static_assert(offsetof(type, __cacheline_group_end__##grp) - \ offsetofend(type, __cacheline_group_begin__##grp) == \ (sz))#define __libeth_cacheline_struct_assert(type, sz) \ static_assert(sizeof(type) == (sz))#else /* !CONFIG_64BIT || SMP_CACHE_BYTES != 64 */#define libeth_cacheline_group_assert(type, grp, sz) \ static_assert(offsetof(type, __cacheline_group_end__##grp) - \ offsetofend(type, __cacheline_group_begin__##grp) <= \ (sz))#define __libeth_cacheline_struct_assert(type, sz) \ static_assert(sizeof(type) <= (sz))#endif /* !CONFIG_64BIT || SMP_CACHE_BYTES != 64 */
#define __libeth_cls1(sz1) SMP_CACHE_ALIGN(sz1)#define __libeth_cls2(sz1, sz2) (SMP_CACHE_ALIGN(sz1) + SMP_CACHE_ALIGN(sz2))#define __libeth_cls3(sz1, sz2, sz3) \ (SMP_CACHE_ALIGN(sz1) + SMP_CACHE_ALIGN(sz2) + SMP_CACHE_ALIGN(sz3))#define __libeth_cls(...) \ CONCATENATE(__libeth_cls, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
/** * libeth_cacheline_struct_assert - make sure CL-based struct size is expected * @type: type of the struct * @...: from 1 to 3 CL group sizes (read-mostly, read-write, cold) * * When a struct contains several CL groups, it's difficult to predict its size * on different architectures. The macro instead takes sizes of all of the * groups the structure contains and generates the final struct size. */#define libeth_cacheline_struct_assert(type, ...) \ __libeth_cacheline_struct_assert(type, __libeth_cls(__VA_ARGS__)); \ static_assert(__alignof(type) >= SMP_CACHE_BYTES)
/** * libeth_cacheline_set_assert - make sure CL-based struct layout is expected * @type: type of the struct * @ro: expected size of the read-mostly group * @rw: expected size of the read-write group * @c: expected size of the cold group * * Check that each group size is expected and then do final struct size check. */#define libeth_cacheline_set_assert(type, ro, rw, c) \ libeth_cacheline_group_assert(type, read_mostly, ro); \ libeth_cacheline_group_assert(type, read_write, rw); \ libeth_cacheline_group_assert(type, cold, c); \ libeth_cacheline_struct_assert(type, ro, rw, c)
#endif /* __LIBETH_CACHE_H */