1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2019 Intel Corporation
11 * Generic, commonly-used macro and inline function definitions
25 #include <rte_config.h>
27 /* OS specific include */
31 #define typeof __typeof__
40 /** C extension macro for environments lacking C11 features. */
41 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
42 #define RTE_STD_C11 __extension__
48 * RTE_TOOLCHAIN_GCC is defined if the target is built with GCC,
49 * while a host application (like pmdinfogen) may have another compiler.
50 * RTE_CC_IS_GNU is true if the file is compiled with GCC,
51 * no matter it is a target or host application.
53 #define RTE_CC_IS_GNU 0
56 #elif defined __INTEL_COMPILER
58 #elif defined __GNUC__
61 #define RTE_CC_IS_GNU 1
64 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + \
71 #define __rte_aligned(a) __attribute__((__aligned__(a)))
73 #ifdef RTE_ARCH_STRICT_ALIGN
74 typedef uint64_t unaligned_uint64_t __rte_aligned(1);
75 typedef uint32_t unaligned_uint32_t __rte_aligned(1);
76 typedef uint16_t unaligned_uint16_t __rte_aligned(1);
78 typedef uint64_t unaligned_uint64_t;
79 typedef uint32_t unaligned_uint32_t;
80 typedef uint16_t unaligned_uint16_t;
84 * Force a structure to be packed
86 #define __rte_packed __attribute__((__packed__))
88 /******* Macro to mark functions and fields scheduled for removal *****/
89 #define __rte_deprecated __attribute__((__deprecated__))
90 #define __rte_deprecated_msg(msg) __attribute__((__deprecated__(msg)))
93 * Macro to mark macros and defines scheduled for removal
95 #if defined(RTE_CC_GCC) || defined(RTE_CC_CLANG)
96 #define RTE_PRAGMA(x) _Pragma(#x)
97 #define RTE_PRAGMA_WARNING(w) RTE_PRAGMA(GCC warning #w)
98 #define RTE_DEPRECATED(x) RTE_PRAGMA_WARNING(#x is deprecated)
100 #define RTE_DEPRECATED(x)
104 * Mark a function or variable to a weak reference.
106 #define __rte_weak __attribute__((__weak__))
109 * Force symbol to be generated even if it appears to be unused.
111 #define __rte_used __attribute__((used))
113 /*********** Macros to eliminate unused variable warnings ********/
116 * short definition to mark a function parameter unused
118 #define __rte_unused __attribute__((__unused__))
121 * Mark pointer as restricted with regard to pointer aliasing.
123 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
124 #define __rte_restrict __restrict
126 #define __rte_restrict restrict
130 * definition to mark a variable or function parameter as used so
131 * as to avoid a compiler warning
133 #define RTE_SET_USED(x) (void)(x)
136 * Check format string and its arguments at compile-time.
138 * GCC on Windows assumes MS-specific format string by default,
139 * even if the underlying stdio implementation is ANSI-compliant,
140 * so this must be overridden.
143 #define __rte_format_printf(format_index, first_arg) \
144 __attribute__((format(gnu_printf, format_index, first_arg)))
146 #define __rte_format_printf(format_index, first_arg) \
147 __attribute__((format(printf, format_index, first_arg)))
151 * Tells compiler that the function returns a value that points to
152 * memory, where the size is given by the one or two arguments.
153 * Used by compiler to validate object size.
155 #if defined(RTE_CC_GCC) || defined(RTE_CC_CLANG)
156 #define __rte_alloc_size(...) \
157 __attribute__((alloc_size(__VA_ARGS__)))
159 #define __rte_alloc_size(...)
162 #define RTE_PRIORITY_LOG 101
163 #define RTE_PRIORITY_BUS 110
164 #define RTE_PRIORITY_CLASS 120
165 #define RTE_PRIORITY_LAST 65535
167 #define RTE_PRIO(prio) \
168 RTE_PRIORITY_ ## prio
171 * Run function before main() with high priority.
174 * Constructor function.
176 * Priority number must be above 100.
177 * Lowest number is the first to run.
179 #ifndef RTE_INIT_PRIO /* Allow to override from EAL */
180 #define RTE_INIT_PRIO(func, prio) \
181 static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
185 * Run function before main() with low priority.
187 * The constructor will be run after prioritized constructors.
190 * Constructor function.
192 #define RTE_INIT(func) \
193 RTE_INIT_PRIO(func, LAST)
196 * Run after main() with low priority.
199 * Destructor function name.
201 * Priority number must be above 100.
202 * Lowest number is the last to run.
204 #ifndef RTE_FINI_PRIO /* Allow to override from EAL */
205 #define RTE_FINI_PRIO(func, prio) \
206 static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
210 * Run after main() with high priority.
212 * The destructor will be run *before* prioritized destructors.
215 * Destructor function name.
217 #define RTE_FINI(func) \
218 RTE_FINI_PRIO(func, LAST)
221 * Hint never returning function
223 #define __rte_noreturn __attribute__((noreturn))
226 * Issue a warning in case the function's return value is ignored.
228 * The use of this attribute should be restricted to cases where
229 * ignoring the marked function's return value is almost always a
230 * bug. With GCC, some effort is required to make clear that ignoring
231 * the return value is intentional. The usual void-casting method to
232 * mark something unused as used does not suppress the warning with
236 * __rte_warn_unused_result int foo();
238 * void ignore_foo_result(void) {
239 * foo(); // generates a warning with all compilers
241 * (void)foo(); // still generates the warning with GCC (but not clang)
243 * int unused __rte_unused;
244 * unused = foo(); // does the trick with all compilers
248 #define __rte_warn_unused_result __attribute__((warn_unused_result))
251 * Force a function to be inlined
253 #define __rte_always_inline inline __attribute__((always_inline))
256 * Force a function to be noinlined
258 #define __rte_noinline __attribute__((noinline))
261 * Hint function in the hot path
263 #define __rte_hot __attribute__((hot))
266 * Hint function in the cold path
268 #define __rte_cold __attribute__((cold))
271 * Disable AddressSanitizer on some code
273 #ifdef RTE_MALLOC_ASAN
275 #define __rte_no_asan __attribute__((no_sanitize("address", "hwaddress")))
277 #define __rte_no_asan __attribute__((no_sanitize_address))
279 #else /* ! RTE_MALLOC_ASAN */
280 #define __rte_no_asan
283 /*********** Macros for pointer arithmetic ********/
286 * add a byte-value offset to a pointer
288 #define RTE_PTR_ADD(ptr, x) ((void*)((uintptr_t)(ptr) + (x)))
291 * subtract a byte-value offset from a pointer
293 #define RTE_PTR_SUB(ptr, x) ((void*)((uintptr_t)ptr - (x)))
296 * get the difference between two pointer values, i.e. how far apart
297 * in bytes are the locations they point two. It is assumed that
298 * ptr1 is greater than ptr2.
300 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
303 * Workaround to cast a const field of a structure to non-const type.
305 #define RTE_CAST_FIELD(var, field, type) \
306 (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
308 /*********** Macros/static functions for doing alignment ********/
312 * Macro to align a pointer to a given power-of-two. The resultant
313 * pointer will be a pointer of the same type as the first parameter, and
314 * point to an address no higher than the first parameter. Second parameter
315 * must be a power-of-two value.
317 #define RTE_PTR_ALIGN_FLOOR(ptr, align) \
318 ((typeof(ptr))RTE_ALIGN_FLOOR((uintptr_t)ptr, align))
321 * Macro to align a value to a given power-of-two. The resultant value
322 * will be of the same type as the first parameter, and will be no
323 * bigger than the first parameter. Second parameter must be a
324 * power-of-two value.
326 #define RTE_ALIGN_FLOOR(val, align) \
327 (typeof(val))((val) & (~((typeof(val))((align) - 1))))
330 * Macro to align a pointer to a given power-of-two. The resultant
331 * pointer will be a pointer of the same type as the first parameter, and
332 * point to an address no lower than the first parameter. Second parameter
333 * must be a power-of-two value.
335 #define RTE_PTR_ALIGN_CEIL(ptr, align) \
336 RTE_PTR_ALIGN_FLOOR((typeof(ptr))RTE_PTR_ADD(ptr, (align) - 1), align)
339 * Macro to align a value to a given power-of-two. The resultant value
340 * will be of the same type as the first parameter, and will be no lower
341 * than the first parameter. Second parameter must be a power-of-two
344 #define RTE_ALIGN_CEIL(val, align) \
345 RTE_ALIGN_FLOOR(((val) + ((typeof(val)) (align) - 1)), align)
348 * Macro to align a pointer to a given power-of-two. The resultant
349 * pointer will be a pointer of the same type as the first parameter, and
350 * point to an address no lower than the first parameter. Second parameter
351 * must be a power-of-two value.
352 * This function is the same as RTE_PTR_ALIGN_CEIL
354 #define RTE_PTR_ALIGN(ptr, align) RTE_PTR_ALIGN_CEIL(ptr, align)
357 * Macro to align a value to a given power-of-two. The resultant
358 * value will be of the same type as the first parameter, and
359 * will be no lower than the first parameter. Second parameter
360 * must be a power-of-two value.
361 * This function is the same as RTE_ALIGN_CEIL
363 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
366 * Macro to align a value to the multiple of given value. The resultant
367 * value will be of the same type as the first parameter and will be no lower
368 * than the first parameter.
370 #define RTE_ALIGN_MUL_CEIL(v, mul) \
371 ((((v) + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
374 * Macro to align a value to the multiple of given value. The resultant
375 * value will be of the same type as the first parameter and will be no higher
376 * than the first parameter.
378 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
379 (((v) / ((typeof(v))(mul))) * (typeof(v))(mul))
382 * Macro to align value to the nearest multiple of the given value.
383 * The resultant value might be greater than or less than the first parameter
384 * whichever difference is the lowest.
386 #define RTE_ALIGN_MUL_NEAR(v, mul) \
388 typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
389 typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
390 (ceil - (v)) > ((v) - floor) ? floor : ceil; \
394 * Checks if a pointer is aligned to a given power-of-two value
397 * The pointer whose alignment is to be checked
399 * The power-of-two value to which the ptr should be aligned
402 * True(1) where the pointer is correctly aligned, false(0) otherwise
405 rte_is_aligned(void *ptr, unsigned align)
407 return RTE_PTR_ALIGN(ptr, align) == ptr;
410 /*********** Macros for compile type checks ********/
413 * Triggers an error at compilation time if the condition is true.
415 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
417 /*********** Cache line related macros ********/
419 /** Cache line mask. */
420 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1)
422 /** Return the first cache-aligned value greater or equal to size. */
423 #define RTE_CACHE_LINE_ROUNDUP(size) \
424 (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / \
425 RTE_CACHE_LINE_SIZE))
427 /** Cache line size in terms of log2 */
428 #if RTE_CACHE_LINE_SIZE == 64
429 #define RTE_CACHE_LINE_SIZE_LOG2 6
430 #elif RTE_CACHE_LINE_SIZE == 128
431 #define RTE_CACHE_LINE_SIZE_LOG2 7
433 #error "Unsupported cache line size"
436 /** Minimum Cache line size. */
437 #define RTE_CACHE_LINE_MIN_SIZE 64
439 /** Force alignment to cache line. */
440 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
442 /** Force minimum cache line alignment. */
443 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
445 /*********** PA/IOVA type definitions ********/
447 /** Physical address */
448 typedef uint64_t phys_addr_t;
449 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
452 * IO virtual address type.
453 * When the physical addressing mode (IOVA as PA) is in use,
454 * the translation from an IO virtual address (IOVA) to a physical address
455 * is a direct mapping, i.e. the same value.
456 * Otherwise, in virtual mode (IOVA as VA), an IOMMU may do the translation.
458 typedef uint64_t rte_iova_t;
459 #define RTE_BAD_IOVA ((rte_iova_t)-1)
461 /*********** Structure alignment markers ********/
463 /** Generic marker for any place in a structure. */
464 __extension__ typedef void *RTE_MARKER[0];
465 /** Marker for 1B alignment in a structure. */
466 __extension__ typedef uint8_t RTE_MARKER8[0];
467 /** Marker for 2B alignment in a structure. */
468 __extension__ typedef uint16_t RTE_MARKER16[0];
469 /** Marker for 4B alignment in a structure. */
470 __extension__ typedef uint32_t RTE_MARKER32[0];
471 /** Marker for 8B alignment in a structure. */
472 __extension__ typedef uint64_t RTE_MARKER64[0];
475 * Combines 32b inputs most significant set bits into the least
476 * significant bits to construct a value with the same MSBs as x
477 * but all 1's under it.
480 * The integer whose MSBs need to be combined with its LSBs
482 * The combined value.
484 static inline uint32_t
485 rte_combine32ms1b(uint32_t x)
497 * Combines 64b inputs most significant set bits into the least
498 * significant bits to construct a value with the same MSBs as x
499 * but all 1's under it.
502 * The integer whose MSBs need to be combined with its LSBs
504 * The combined value.
506 static inline uint64_t
507 rte_combine64ms1b(uint64_t v)
519 /*********** Macros to work with powers of 2 ********/
522 * Macro to return 1 if n is a power of 2, 0 otherwise
524 #define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))
527 * Returns true if n is a power of 2
530 * @return 1 if true, 0 otherwise
533 rte_is_power_of_2(uint32_t n)
535 return n && !(n & (n - 1));
539 * Aligns input parameter to the next power of 2
542 * The integer value to align
545 * Input parameter aligned to the next power of 2
547 static inline uint32_t
548 rte_align32pow2(uint32_t x)
551 x = rte_combine32ms1b(x);
557 * Aligns input parameter to the previous power of 2
560 * The integer value to align
563 * Input parameter aligned to the previous power of 2
565 static inline uint32_t
566 rte_align32prevpow2(uint32_t x)
568 x = rte_combine32ms1b(x);
574 * Aligns 64b input parameter to the next power of 2
577 * The 64b value to align
580 * Input parameter aligned to the next power of 2
582 static inline uint64_t
583 rte_align64pow2(uint64_t v)
586 v = rte_combine64ms1b(v);
592 * Aligns 64b input parameter to the previous power of 2
595 * The 64b value to align
598 * Input parameter aligned to the previous power of 2
600 static inline uint64_t
601 rte_align64prevpow2(uint64_t v)
603 v = rte_combine64ms1b(v);
608 /*********** Macros for calculating min and max **********/
611 * Macro to return the minimum of two numbers
613 #define RTE_MIN(a, b) \
615 typeof (a) _a = (a); \
616 typeof (b) _b = (b); \
621 * Macro to return the maximum of two numbers
623 #define RTE_MAX(a, b) \
625 typeof (a) _a = (a); \
626 typeof (b) _b = (b); \
630 /*********** Other general functions / macros ********/
633 * Searches the input parameter for the least significant set bit
634 * (starting from zero).
635 * If a least significant 1 bit is found, its bit index is returned.
636 * If the content of the input parameter is zero, then the content of the return
637 * value is undefined.
639 * input parameter, should not be zero.
641 * least significant set bit in the input parameter.
643 static inline uint32_t
644 rte_bsf32(uint32_t v)
646 return (uint32_t)__builtin_ctz(v);
650 * Searches the input parameter for the least significant set bit
651 * (starting from zero). Safe version (checks for input parameter being zero).
653 * @warning ``pos`` must be a valid pointer. It is not checked!
656 * The input parameter.
658 * If ``v`` was not 0, this value will contain position of least significant
659 * bit within the input parameter.
661 * Returns 0 if ``v`` was 0, otherwise returns 1.
664 rte_bsf32_safe(uint32_t v, uint32_t *pos)
674 * Return the rounded-up log2 of a integer.
676 * @note Contrary to the logarithm mathematical operation,
677 * rte_log2_u32(0) == 0 and not -inf.
680 * The input parameter.
682 * The rounded-up log2 of the input, or 0 if the input is 0.
684 static inline uint32_t
685 rte_log2_u32(uint32_t v)
689 v = rte_align32pow2(v);
695 * Return the last (most-significant) bit set.
697 * @note The last (most significant) bit is at position 32.
698 * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
701 * The input parameter.
703 * The last (most-significant) bit set, or 0 if the input is 0.
706 rte_fls_u32(uint32_t x)
708 return (x == 0) ? 0 : 32 - __builtin_clz(x);
712 * Searches the input parameter for the least significant set bit
713 * (starting from zero).
714 * If a least significant 1 bit is found, its bit index is returned.
715 * If the content of the input parameter is zero, then the content of the return
716 * value is undefined.
718 * input parameter, should not be zero.
720 * least significant set bit in the input parameter.
723 rte_bsf64(uint64_t v)
725 return (uint32_t)__builtin_ctzll(v);
729 * Searches the input parameter for the least significant set bit
730 * (starting from zero). Safe version (checks for input parameter being zero).
732 * @warning ``pos`` must be a valid pointer. It is not checked!
735 * The input parameter.
737 * If ``v`` was not 0, this value will contain position of least significant
738 * bit within the input parameter.
740 * Returns 0 if ``v`` was 0, otherwise returns 1.
743 rte_bsf64_safe(uint64_t v, uint32_t *pos)
753 * Return the last (most-significant) bit set.
755 * @note The last (most significant) bit is at position 64.
756 * @note rte_fls_u64(0) = 0, rte_fls_u64(1) = 1,
757 * rte_fls_u64(0x8000000000000000) = 64
760 * The input parameter.
762 * The last (most-significant) bit set, or 0 if the input is 0.
765 rte_fls_u64(uint64_t x)
767 return (x == 0) ? 0 : 64 - __builtin_clzll(x);
771 * Return the rounded-up log2 of a 64-bit integer.
773 * @note Contrary to the logarithm mathematical operation,
774 * rte_log2_u64(0) == 0 and not -inf.
777 * The input parameter.
779 * The rounded-up log2 of the input, or 0 if the input is 0.
781 static inline uint32_t
782 rte_log2_u64(uint64_t v)
786 v = rte_align64pow2(v);
787 /* we checked for v being 0 already, so no undefined behavior */
792 /** Return the offset of a field in a structure. */
793 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
797 * Return pointer to the wrapping struct instance.
807 * struct child *x = obtain(...);
808 * struct wrapper *w = container_of(x, struct wrapper, c);
811 #define container_of(ptr, type, member) __extension__ ({ \
812 const typeof(((type *)0)->member) *_ptr = (ptr); \
813 __rte_unused type *_target_ptr = \
815 (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
819 /** Swap two variables. */
820 #define RTE_SWAP(a, b) \
828 * Get the size of a field in a structure.
831 * The type of the structure.
833 * The field in the structure.
835 * The size of the field in the structure, in bytes.
837 #define RTE_SIZEOF_FIELD(type, field) (sizeof(((type *)0)->field))
839 #define _RTE_STR(x) #x
840 /** Take a macro value and get a string version of it */
841 #define RTE_STR(x) _RTE_STR(x)
844 * ISO C helpers to modify format strings using variadic macros.
845 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
846 * An empty %s argument is appended to avoid a dangling comma.
848 #define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
849 #define RTE_FMT_HEAD(fmt, ...) fmt
850 #define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__
852 /** Mask value of type "tp" for the first "ln" bit set. */
853 #define RTE_LEN2MASK(ln, tp) \
854 ((tp)((uint64_t)-1 >> (sizeof(uint64_t) * CHAR_BIT - (ln))))
856 /** Number of elements in the array. */
857 #define RTE_DIM(a) (sizeof (a) / sizeof ((a)[0]))
860 * Converts a numeric string to the equivalent uint64_t value.
861 * As well as straight number conversion, also recognises the suffixes
862 * k, m and g for kilobytes, megabytes and gigabytes respectively.
864 * If a negative number is passed in i.e. a string with the first non-black
865 * character being "-", zero is returned. Zero is also returned in the case of
866 * an error with the strtoull call in the function.
869 * String containing number to convert.
873 static inline uint64_t
874 rte_str_to_size(const char *str)
877 unsigned long long size;
879 while (isspace((int)*str))
885 size = strtoull(str, &endptr, 0);
890 endptr++; /* allow 1 space gap */
893 case 'G': case 'g': size *= 1024; /* fall-through */
894 case 'M': case 'm': size *= 1024; /* fall-through */
895 case 'K': case 'k': size *= 1024; /* fall-through */
903 * Function to terminate the application immediately, printing an error
904 * message and returning the exit_code back to the shell.
906 * This function never returns
909 * The exit code to be returned by the application
911 * The format string to be used for printing the message. This can include
912 * printf format characters which will be expanded using any further parameters
916 rte_exit(int exit_code, const char *format, ...)
917 __rte_format_printf(2, 3);