From: "Mattias Rönnblom" <mattias.ronnblom@ericsson.com>
To: <dev@dpdk.org>
Cc: hofors@lysator.liu.se, "Heng Wang" <heng.wang@ericsson.com>,
"Stephen Hemminger" <stephen@networkplumber.org>,
"Tyler Retzlaff" <roretzla@linux.microsoft.com>,
"Morten Brørup" <mb@smartsharesystems.com>,
"Jack Bond-Preston" <jack.bond-preston@foss.arm.com>,
"David Marchand" <david.marchand@redhat.com>,
"Chengwen Feng" <fengchengwen@huawei.com>,
"Mattias Rönnblom" <mattias.ronnblom@ericsson.com>
Subject: [PATCH v9 2/6] eal: extend bit manipulation functionality
Date: Wed, 18 Sep 2024 11:04:41 +0200 [thread overview]
Message-ID: <20240918090445.725283-3-mattias.ronnblom@ericsson.com> (raw)
In-Reply-To: <20240918090445.725283-1-mattias.ronnblom@ericsson.com>
Add functionality to test and modify the value of individual bits in
32-bit or 64-bit words.
These functions have no implications on memory ordering, atomicity and
does not use volatile and thus does not prevent any compiler
optimizations.
Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
Acked-by: Jack Bond-Preston <jack.bond-preston@foss.arm.com>
--
PATCH v3:
* Remove unnecessary <rte_compat.h> include.
* Remove redundant 'fun' parameter from the __RTE_GEN_BIT_*() macros
(Jack Bond-Preston).
* Introduce __RTE_BIT_BIT_OPS() macro, consistent with how things
are done when generating the atomic bit operations.
* Refer to volatile bit op functions as variants instead of families
(macro parameter naming).
RFC v6:
* Have rte_bit_test() accept const-marked bitsets.
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.
---
lib/eal/include/rte_bitops.h | 260 ++++++++++++++++++++++++++++++++++-
1 file changed, 258 insertions(+), 2 deletions(-)
diff --git a/lib/eal/include/rte_bitops.h b/lib/eal/include/rte_bitops.h
index 449565eeae..6915b945ba 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 <stdint.h>
+#include <rte_compat.h>
#include <rte_debug.h>
#ifdef __cplusplus
@@ -105,6 +108,197 @@ 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, \
+ const uint32_t *: __rte_bit_test32, \
+ uint64_t *: __rte_bit_test64, \
+ const 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(variant, qualifier, size) \
+ __rte_experimental \
+ static inline bool \
+ __rte_bit_ ## variant ## test ## 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(variant, qualifier, size) \
+ __rte_experimental \
+ static inline void \
+ __rte_bit_ ## variant ## set ## 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(variant, qualifier, size) \
+ __rte_experimental \
+ static inline void \
+ __rte_bit_ ## variant ## clear ## 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(variant, qualifier, size) \
+ __rte_experimental \
+ static inline void \
+ __rte_bit_ ## variant ## assign ## size(qualifier uint ## size ## _t *addr, \
+ unsigned int nr, bool value) \
+ { \
+ if (value) \
+ __rte_bit_ ## variant ## set ## size(addr, nr); \
+ else \
+ __rte_bit_ ## variant ## clear ## size(addr, nr); \
+ }
+
+#define __RTE_GEN_BIT_FLIP(variant, qualifier, size) \
+ __rte_experimental \
+ static inline void \
+ __rte_bit_ ## variant ## flip ## size(qualifier uint ## size ## _t *addr, \
+ unsigned int nr) \
+ { \
+ bool value; \
+ \
+ value = __rte_bit_ ## variant ## test ## size(addr, nr); \
+ __rte_bit_ ## variant ## assign ## size(addr, nr, !value); \
+ }
+
+#define __RTE_GEN_BIT_OPS(v, qualifier, size) \
+ __RTE_GEN_BIT_TEST(v, qualifier, size) \
+ __RTE_GEN_BIT_SET(v, qualifier, size) \
+ __RTE_GEN_BIT_CLEAR(v, qualifier, size) \
+ __RTE_GEN_BIT_ASSIGN(v, qualifier, size) \
+ __RTE_GEN_BIT_FLIP(v, qualifier, size)
+
+#define __RTE_GEN_BIT_OPS_SIZE(size) \
+ __RTE_GEN_BIT_OPS(,, size)
+
+__RTE_GEN_BIT_OPS_SIZE(32)
+__RTE_GEN_BIT_OPS_SIZE(64)
+
/*------------------------ 32-bit relaxed operations ------------------------*/
/**
@@ -787,6 +981,68 @@ 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_ */
--
2.34.1
next prev parent reply other threads:[~2024-09-18 9:14 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-31 13:13 [RFC v3] eal: add bitset type Mattias Rönnblom
2024-01-31 16:02 ` Stephen Hemminger
2024-01-31 16:28 ` Mattias Rönnblom
2024-01-31 16:06 ` Stephen Hemminger
2024-01-31 18:45 ` Mattias Rönnblom
2024-02-01 8:04 ` Morten Brørup
2024-02-02 10:19 ` Mattias Rönnblom
2024-02-02 12:42 ` Morten Brørup
2024-02-16 10:23 ` [RFC v4 1/4] " Mattias Rönnblom
2024-02-16 10:23 ` [RFC v4 2/4] eal: add bitset test suite Mattias Rönnblom
2024-02-16 10:23 ` [RFC v4 3/4] service: use multi-word bitset to represent service flags Mattias Rönnblom
2024-02-16 10:23 ` [RFC v4 4/4] event/dsw: optimize serving port logic Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 1/6] eal: add bitset type Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 2/6] eal: add bitset test suite Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 3/6] eal: add atomic bitset functions Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 4/6] eal: add unit tests for atomic bitset operations Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 5/6] service: use multi-word bitset to represent service flags Mattias Rönnblom
2024-05-05 7:33 ` [RFC v5 6/6] event/dsw: optimize serving port logic Mattias Rönnblom
2024-08-09 20:14 ` [PATCH 1/6] eal: add bitset type Mattias Rönnblom
2024-08-09 20:14 ` [PATCH 2/6] eal: add bitset test suite Mattias Rönnblom
2024-09-12 4:51 ` Tyler Retzlaff
2024-08-09 20:14 ` [PATCH 3/6] eal: add atomic bitset functions Mattias Rönnblom
2024-09-12 4:51 ` Tyler Retzlaff
2024-08-09 20:14 ` [PATCH 4/6] eal: add unit tests for atomic bitset operations Mattias Rönnblom
2024-09-12 4:52 ` Tyler Retzlaff
2024-10-09 20:29 ` Morten Brørup
2024-08-09 20:14 ` [PATCH 5/6] service: use multi-word bitset to represent service flags Mattias Rönnblom
2024-09-12 4:52 ` Tyler Retzlaff
2024-08-09 20:14 ` [PATCH 6/6] event/dsw: add support for larger port count Mattias Rönnblom
2024-09-12 4:53 ` Tyler Retzlaff
2024-08-20 17:09 ` [PATCH 1/6] eal: add bitset type Mattias Rönnblom
2024-09-02 13:55 ` Morten Brørup
2024-09-02 14:46 ` Mattias Rönnblom
2024-09-02 14:49 ` Mattias Rönnblom
2024-09-12 4:51 ` Tyler Retzlaff
2024-09-17 9:36 ` [PATCH v7 0/6] Improve EAL bit operations API Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 1/6] dpdk: do not force C linkage on include file dependencies Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 0/6] Improve EAL bit operations API Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 1/6] dpdk: do not force C linkage on include file dependencies Mattias Rönnblom
2024-09-18 9:04 ` [PATCH v9 0/6] Improve EAL bit operations API Mattias Rönnblom
2024-09-18 9:04 ` [PATCH v9 1/6] dpdk: do not force C linkage on include file dependencies Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 0/7] Improve EAL bit operations API Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 1/7] buildtools/chkincs: relax C linkage requirement Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 0/7] Improve EAL bit operations API Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 1/7] buildtools/chkincs: relax C linkage requirement Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 0/7] Improve EAL bit operations API Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 1/7] buildtools/chkincs: relax C linkage requirement Mattias Rönnblom
2024-10-03 16:47 ` Robin Jarry
2024-10-04 7:31 ` Mattias Rönnblom
2024-10-04 8:05 ` Robin Jarry
2024-10-04 8:40 ` Mattias Rönnblom
2024-10-04 11:51 ` Robin Jarry
2024-10-04 12:19 ` Thomas Monjalon
2024-10-06 8:55 ` Mattias Rönnblom
2024-10-06 9:47 ` Mattias Rönnblom
2024-10-06 12:25 ` Robin Jarry
2024-10-06 13:09 ` Robin Jarry
2024-10-06 14:17 ` Mattias Rönnblom
2024-10-06 15:58 ` Robin Jarry
2024-10-10 10:24 ` Mattias Rönnblom
2024-10-10 10:39 ` Bruce Richardson
2024-09-20 10:47 ` [PATCH v12 2/7] dpdk: use C linkage only where appropriate Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 3/7] eal: extend bit manipulation functionality Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 4/7] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 5/7] eal: add atomic " Mattias Rönnblom
2024-09-20 10:47 ` [PATCH v12 6/7] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-10-10 10:45 ` David Marchand
2024-10-10 11:55 ` Mattias Rönnblom
2024-10-10 12:14 ` David Marchand
2024-10-10 12:35 ` Mattias Rönnblom
2024-10-10 13:07 ` Thomas Monjalon
2024-10-11 8:35 ` David Marchand
2024-10-11 15:06 ` Morten Brørup
2024-10-11 15:11 ` David Marchand
2024-10-11 15:15 ` Morten Brørup
2024-10-11 15:18 ` David Marchand
2024-09-20 10:47 ` [PATCH v12 7/7] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-10-09 20:18 ` [PATCH v12 0/7] Improve EAL bit operations API David Marchand
2024-09-20 6:24 ` [PATCH v11 2/7] dpdk: use C linkage only where appropriate Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 3/7] eal: extend bit manipulation functionality Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 4/7] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 5/7] eal: add atomic " Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 6/7] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-09-20 6:24 ` [PATCH v11 7/7] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 2/7] dpdk: use C linkage only where appropriate Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 3/7] eal: extend bit manipulation functionality Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 4/7] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 5/7] eal: add atomic " Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 6/7] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-09-19 19:31 ` [PATCH v10 7/7] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-09-18 9:04 ` Mattias Rönnblom [this message]
2024-09-18 9:04 ` [PATCH v9 3/6] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-18 9:04 ` [PATCH v9 4/6] eal: add atomic " Mattias Rönnblom
2024-09-18 9:04 ` [PATCH v9 5/6] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-09-18 9:04 ` [PATCH v9 6/6] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 2/6] eal: extend bit manipulation functionality Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 3/6] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 4/6] eal: add atomic " Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 5/6] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-09-17 10:48 ` [PATCH v8 6/6] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 2/6] eal: extend bit manipulation functionality Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 3/6] eal: add unit tests for bit operations Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 4/6] eal: add atomic " Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 5/6] eal: add unit tests for atomic bit access functions Mattias Rönnblom
2024-09-17 9:36 ` [PATCH v7 6/6] eal: extend bitops to handle volatile pointers Mattias Rönnblom
2024-10-10 8:30 ` [PATCH v2 0/4] Add bitset type David Marchand
2024-10-10 8:30 ` [PATCH v2 1/4] eal: add " David Marchand
2024-10-11 9:35 ` Mattias Rönnblom
2024-10-16 11:30 ` David Marchand
2024-10-16 13:37 ` Mattias Rönnblom
2024-10-10 8:30 ` [PATCH v2 2/4] bitset: add atomic functions David Marchand
2024-10-10 8:30 ` [PATCH v2 3/4] service: use multi-word bitset to represent service flags David Marchand
2024-10-10 8:30 ` [PATCH v2 4/4] event/dsw: add support for larger port count David Marchand
2024-10-14 15:08 ` [PATCH v2 0/4] Add bitset type David Marchand
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