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These functions have no implications on memory ordering, atomicity and does not use volatile and thus does not prevent any compiler optimizations. RFC v4: * Add rte_bit_flip() which, believe it or not, flips the value of a bit. * Mark macro-generated private functions as experimental. * Use macros to generate *assign*() functions. RFC v3: * Work around lack of C++ support for _Generic (Tyler Retzlaff). * Fix ','-related checkpatch warnings. Signed-off-by: Mattias Rönnblom Acked-by: Morten Brørup Acked-by: Tyler Retzlaff --- lib/eal/include/rte_bitops.h | 257 ++++++++++++++++++++++++++++++++++- 1 file changed, 255 insertions(+), 2 deletions(-) diff --git a/lib/eal/include/rte_bitops.h b/lib/eal/include/rte_bitops.h index 449565eeae..9d426f1602 100644 --- a/lib/eal/include/rte_bitops.h +++ b/lib/eal/include/rte_bitops.h @@ -2,6 +2,7 @@ * Copyright(c) 2020 Arm Limited * Copyright(c) 2010-2019 Intel Corporation * Copyright(c) 2023 Microsoft Corporation + * Copyright(c) 2024 Ericsson AB */ #ifndef _RTE_BITOPS_H_ @@ -11,12 +12,14 @@ * @file * Bit Operations * - * This file defines a family of APIs for bit operations - * without enforcing memory ordering. + * This file provides functionality for low-level, single-word + * arithmetic and bit-level operations, such as counting or + * setting individual bits. */ #include +#include #include #ifdef __cplusplus @@ -105,6 +108,194 @@ extern "C" { #define RTE_FIELD_GET64(mask, reg) \ ((typeof(mask))(((reg) & (mask)) >> rte_ctz64(mask))) +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Test bit in word. + * + * Generic selection macro to test the value of a bit in a 32-bit or + * 64-bit word. The type of operation depends on the type of the @c + * addr parameter. + * + * This macro does not give any guarantees in regards to memory + * ordering or atomicity. + * + * @param addr + * A pointer to the word to modify. + * @param nr + * The index of the bit. + */ +#define rte_bit_test(addr, nr) \ + _Generic((addr), \ + uint32_t *: __rte_bit_test32, \ + uint64_t *: __rte_bit_test64)(addr, nr) + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Set bit in word. + * + * Generic selection macro to set a bit in a 32-bit or 64-bit + * word. The type of operation depends on the type of the @c addr + * parameter. + * + * This macro does not give any guarantees in regards to memory + * ordering or atomicity. + * + * @param addr + * A pointer to the word to modify. + * @param nr + * The index of the bit. + */ +#define rte_bit_set(addr, nr) \ + _Generic((addr), \ + uint32_t *: __rte_bit_set32, \ + uint64_t *: __rte_bit_set64)(addr, nr) + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Clear bit in word. + * + * Generic selection macro to clear a bit in a 32-bit or 64-bit + * word. The type of operation depends on the type of the @c addr + * parameter. + * + * This macro does not give any guarantees in regards to memory + * ordering or atomicity. + * + * @param addr + * A pointer to the word to modify. + * @param nr + * The index of the bit. + */ +#define rte_bit_clear(addr, nr) \ + _Generic((addr), \ + uint32_t *: __rte_bit_clear32, \ + uint64_t *: __rte_bit_clear64)(addr, nr) + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Assign a value to a bit in word. + * + * Generic selection macro to assign a value to a bit in a 32-bit or 64-bit + * word. The type of operation depends on the type of the @c addr parameter. + * + * This macro does not give any guarantees in regards to memory + * ordering or atomicity. + * + * @param addr + * A pointer to the word to modify. + * @param nr + * The index of the bit. + * @param value + * The new value of the bit - true for '1', or false for '0'. + */ +#define rte_bit_assign(addr, nr, value) \ + _Generic((addr), \ + uint32_t *: __rte_bit_assign32, \ + uint64_t *: __rte_bit_assign64)(addr, nr, value) + +/** + * @warning + * @b EXPERIMENTAL: this API may change without prior notice. + * + * Flip a bit in word. + * + * Generic selection macro to change the value of a bit to '0' if '1' + * or '1' if '0' in a 32-bit or 64-bit word. The type of operation + * depends on the type of the @c addr parameter. + * + * This macro does not give any guarantees in regards to memory + * ordering or atomicity. + * + * @param addr + * A pointer to the word to modify. + * @param nr + * The index of the bit. + */ +#define rte_bit_flip(addr, nr) \ + _Generic((addr), \ + uint32_t *: __rte_bit_flip32, \ + uint64_t *: __rte_bit_flip64)(addr, nr) + +#define __RTE_GEN_BIT_TEST(family, fun, qualifier, size) \ + __rte_experimental \ + static inline bool \ + __rte_bit_ ## family ## fun ## size(const qualifier uint ## size ## _t *addr, \ + unsigned int nr) \ + { \ + RTE_ASSERT(nr < size); \ + \ + uint ## size ## _t mask = (uint ## size ## _t)1 << nr; \ + return *addr & mask; \ + } + +#define __RTE_GEN_BIT_SET(family, fun, qualifier, size) \ + __rte_experimental \ + static inline void \ + __rte_bit_ ## family ## fun ## size(qualifier uint ## size ## _t *addr, \ + unsigned int nr) \ + { \ + RTE_ASSERT(nr < size); \ + \ + uint ## size ## _t mask = (uint ## size ## _t)1 << nr; \ + *addr |= mask; \ + } \ + +#define __RTE_GEN_BIT_CLEAR(family, fun, qualifier, size) \ + __rte_experimental \ + static inline void \ + __rte_bit_ ## family ## fun ## size(qualifier uint ## size ## _t *addr, \ + unsigned int nr) \ + { \ + RTE_ASSERT(nr < size); \ + \ + uint ## size ## _t mask = ~((uint ## size ## _t)1 << nr); \ + (*addr) &= mask; \ + } \ + +#define __RTE_GEN_BIT_ASSIGN(family, fun, qualifier, size) \ + __rte_experimental \ + static inline void \ + __rte_bit_ ## family ## fun ## size(qualifier uint ## size ## _t *addr, \ + unsigned int nr, bool value) \ + { \ + if (value) \ + __rte_bit_ ## family ## set ## size(addr, nr); \ + else \ + __rte_bit_ ## family ## clear ## size(addr, nr); \ + } + +#define __RTE_GEN_BIT_FLIP(family, fun, qualifier, size) \ + __rte_experimental \ + static inline void \ + __rte_bit_ ## family ## fun ## size(qualifier uint ## size ## _t *addr, \ + unsigned int nr) \ + { \ + bool value; \ + \ + value = __rte_bit_ ## family ## test ## size(addr, nr); \ + __rte_bit_ ## family ## assign ## size(addr, nr, !value); \ + } + +__RTE_GEN_BIT_TEST(, test,, 32) +__RTE_GEN_BIT_SET(, set,, 32) +__RTE_GEN_BIT_CLEAR(, clear,, 32) +__RTE_GEN_BIT_ASSIGN(, assign,, 32) +__RTE_GEN_BIT_FLIP(, flip,, 32) + +__RTE_GEN_BIT_TEST(, test,, 64) +__RTE_GEN_BIT_SET(, set,, 64) +__RTE_GEN_BIT_CLEAR(, clear,, 64) +__RTE_GEN_BIT_ASSIGN(, assign,, 64) +__RTE_GEN_BIT_FLIP(, flip,, 64) + /*------------------------ 32-bit relaxed operations ------------------------*/ /** @@ -787,6 +978,68 @@ rte_log2_u64(uint64_t v) #ifdef __cplusplus } + +/* + * Since C++ doesn't support generic selection (i.e., _Generic), + * function overloading is used instead. Such functions must be + * defined outside 'extern "C"' to be accepted by the compiler. + */ + +#undef rte_bit_test +#undef rte_bit_set +#undef rte_bit_clear +#undef rte_bit_assign +#undef rte_bit_flip + +#define __RTE_BIT_OVERLOAD_SZ_2(fun, qualifier, size, arg1_type, arg1_name) \ + static inline void \ + rte_bit_ ## fun(qualifier uint ## size ## _t *addr, \ + arg1_type arg1_name) \ + { \ + __rte_bit_ ## fun ## size(addr, arg1_name); \ + } + +#define __RTE_BIT_OVERLOAD_2(fun, qualifier, arg1_type, arg1_name) \ + __RTE_BIT_OVERLOAD_SZ_2(fun, qualifier, 32, arg1_type, arg1_name) \ + __RTE_BIT_OVERLOAD_SZ_2(fun, qualifier, 64, arg1_type, arg1_name) + +#define __RTE_BIT_OVERLOAD_SZ_2R(fun, qualifier, size, ret_type, arg1_type, \ + arg1_name) \ + static inline ret_type \ + rte_bit_ ## fun(qualifier uint ## size ## _t *addr, \ + arg1_type arg1_name) \ + { \ + return __rte_bit_ ## fun ## size(addr, arg1_name); \ + } + +#define __RTE_BIT_OVERLOAD_2R(fun, qualifier, ret_type, arg1_type, arg1_name) \ + __RTE_BIT_OVERLOAD_SZ_2R(fun, qualifier, 32, ret_type, arg1_type, \ + arg1_name) \ + __RTE_BIT_OVERLOAD_SZ_2R(fun, qualifier, 64, ret_type, arg1_type, \ + arg1_name) + +#define __RTE_BIT_OVERLOAD_SZ_3(fun, qualifier, size, arg1_type, arg1_name, \ + arg2_type, arg2_name) \ + static inline void \ + rte_bit_ ## fun(uint ## size ## _t *addr, arg1_type arg1_name, \ + arg2_type arg2_name) \ + { \ + __rte_bit_ ## fun ## size(addr, arg1_name, arg2_name); \ + } + +#define __RTE_BIT_OVERLOAD_3(fun, qualifier, arg1_type, arg1_name, arg2_type, \ + arg2_name) \ + __RTE_BIT_OVERLOAD_SZ_3(fun, qualifier, 32, arg1_type, arg1_name, \ + arg2_type, arg2_name) \ + __RTE_BIT_OVERLOAD_SZ_3(fun, qualifier, 64, arg1_type, arg1_name, \ + arg2_type, arg2_name) + +__RTE_BIT_OVERLOAD_2R(test, const, bool, unsigned int, nr) +__RTE_BIT_OVERLOAD_2(set,, unsigned int, nr) +__RTE_BIT_OVERLOAD_2(clear,, unsigned int, nr) +__RTE_BIT_OVERLOAD_3(assign,, unsigned int, nr, bool, value) +__RTE_BIT_OVERLOAD_2(flip,, unsigned int, nr) + #endif #endif /* _RTE_BITOPS_H_ */