/* 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 */