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__
38 /** C extension macro for environments lacking C11 features. */
39 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
40 #define RTE_STD_C11 __extension__
46 * RTE_TOOLCHAIN_GCC is defined if the target is built with GCC,
47 * while a host application (like pmdinfogen) may have another compiler.
48 * RTE_CC_IS_GNU is true if the file is compiled with GCC,
49 * no matter it is a target or host application.
51 #define RTE_CC_IS_GNU 0
54 #elif defined __INTEL_COMPILER
56 #elif defined __GNUC__
59 #define RTE_CC_IS_GNU 1
62 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + \
69 #define __rte_aligned(a) __attribute__((__aligned__(a)))
71 #ifdef RTE_ARCH_STRICT_ALIGN
72 typedef uint64_t unaligned_uint64_t __rte_aligned(1);
73 typedef uint32_t unaligned_uint32_t __rte_aligned(1);
74 typedef uint16_t unaligned_uint16_t __rte_aligned(1);
76 typedef uint64_t unaligned_uint64_t;
77 typedef uint32_t unaligned_uint32_t;
78 typedef uint16_t unaligned_uint16_t;
82 * Force a structure to be packed
84 #define __rte_packed __attribute__((__packed__))
86 /******* Macro to mark functions and fields scheduled for removal *****/
87 #define __rte_deprecated __attribute__((__deprecated__))
88 #define __rte_deprecated_msg(msg) __attribute__((__deprecated__(msg)))
91 * Mark a function or variable to a weak reference.
93 #define __rte_weak __attribute__((__weak__))
96 * Force symbol to be generated even if it appears to be unused.
98 #define __rte_used __attribute__((used))
100 /*********** Macros to eliminate unused variable warnings ********/
103 * short definition to mark a function parameter unused
105 #define __rte_unused __attribute__((__unused__))
108 * Mark pointer as restricted with regard to pointer aliasing.
110 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
111 #define __rte_restrict __restrict
113 #define __rte_restrict restrict
117 * definition to mark a variable or function parameter as used so
118 * as to avoid a compiler warning
120 #define RTE_SET_USED(x) (void)(x)
123 * Check format string and its arguments at compile-time.
125 * GCC on Windows assumes MS-specific format string by default,
126 * even if the underlying stdio implementation is ANSI-compliant,
127 * so this must be overridden.
130 #define __rte_format_printf(format_index, first_arg) \
131 __attribute__((format(gnu_printf, format_index, first_arg)))
133 #define __rte_format_printf(format_index, first_arg) \
134 __attribute__((format(printf, format_index, first_arg)))
138 * Tells compiler that the function returns a value that points to
139 * memory, where the size is given by the one or two arguments.
140 * Used by compiler to validate object size.
142 #if defined(RTE_CC_GCC) || defined(RTE_CC_CLANG)
143 #define __rte_alloc_size(...) \
144 __attribute__((alloc_size(__VA_ARGS__)))
146 #define __rte_alloc_size(...)
149 #define RTE_PRIORITY_LOG 101
150 #define RTE_PRIORITY_BUS 110
151 #define RTE_PRIORITY_CLASS 120
152 #define RTE_PRIORITY_LAST 65535
154 #define RTE_PRIO(prio) \
155 RTE_PRIORITY_ ## prio
158 * Run function before main() with high priority.
161 * Constructor function.
163 * Priority number must be above 100.
164 * Lowest number is the first to run.
166 #ifndef RTE_INIT_PRIO /* Allow to override from EAL */
167 #define RTE_INIT_PRIO(func, prio) \
168 static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
172 * Run function before main() with low priority.
174 * The constructor will be run after prioritized constructors.
177 * Constructor function.
179 #define RTE_INIT(func) \
180 RTE_INIT_PRIO(func, LAST)
183 * Run after main() with low priority.
186 * Destructor function name.
188 * Priority number must be above 100.
189 * Lowest number is the last to run.
191 #ifndef RTE_FINI_PRIO /* Allow to override from EAL */
192 #define RTE_FINI_PRIO(func, prio) \
193 static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
197 * Run after main() with high priority.
199 * The destructor will be run *before* prioritized destructors.
202 * Destructor function name.
204 #define RTE_FINI(func) \
205 RTE_FINI_PRIO(func, LAST)
208 * Hint never returning function
210 #define __rte_noreturn __attribute__((noreturn))
213 * Force a function to be inlined
215 #define __rte_always_inline inline __attribute__((always_inline))
218 * Force a function to be noinlined
220 #define __rte_noinline __attribute__((noinline))
223 * Hint function in the hot path
225 #define __rte_hot __attribute__((hot))
228 * Hint function in the cold path
230 #define __rte_cold __attribute__((cold))
232 /*********** Macros for pointer arithmetic ********/
235 * add a byte-value offset to a pointer
237 #define RTE_PTR_ADD(ptr, x) ((void*)((uintptr_t)(ptr) + (x)))
240 * subtract a byte-value offset from a pointer
242 #define RTE_PTR_SUB(ptr, x) ((void*)((uintptr_t)ptr - (x)))
245 * get the difference between two pointer values, i.e. how far apart
246 * in bytes are the locations they point two. It is assumed that
247 * ptr1 is greater than ptr2.
249 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
252 * Workaround to cast a const field of a structure to non-const type.
254 #define RTE_CAST_FIELD(var, field, type) \
255 (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
257 /*********** Macros/static functions for doing alignment ********/
261 * Macro to align a pointer to a given power-of-two. The resultant
262 * pointer will be a pointer of the same type as the first parameter, and
263 * point to an address no higher than the first parameter. Second parameter
264 * must be a power-of-two value.
266 #define RTE_PTR_ALIGN_FLOOR(ptr, align) \
267 ((typeof(ptr))RTE_ALIGN_FLOOR((uintptr_t)ptr, align))
270 * Macro to align a value to a given power-of-two. The resultant value
271 * will be of the same type as the first parameter, and will be no
272 * bigger than the first parameter. Second parameter must be a
273 * power-of-two value.
275 #define RTE_ALIGN_FLOOR(val, align) \
276 (typeof(val))((val) & (~((typeof(val))((align) - 1))))
279 * Macro to align a pointer to a given power-of-two. The resultant
280 * pointer will be a pointer of the same type as the first parameter, and
281 * point to an address no lower than the first parameter. Second parameter
282 * must be a power-of-two value.
284 #define RTE_PTR_ALIGN_CEIL(ptr, align) \
285 RTE_PTR_ALIGN_FLOOR((typeof(ptr))RTE_PTR_ADD(ptr, (align) - 1), align)
288 * Macro to align a value to a given power-of-two. The resultant value
289 * will be of the same type as the first parameter, and will be no lower
290 * than the first parameter. Second parameter must be a power-of-two
293 #define RTE_ALIGN_CEIL(val, align) \
294 RTE_ALIGN_FLOOR(((val) + ((typeof(val)) (align) - 1)), align)
297 * Macro to align a pointer to a given power-of-two. The resultant
298 * pointer will be a pointer of the same type as the first parameter, and
299 * point to an address no lower than the first parameter. Second parameter
300 * must be a power-of-two value.
301 * This function is the same as RTE_PTR_ALIGN_CEIL
303 #define RTE_PTR_ALIGN(ptr, align) RTE_PTR_ALIGN_CEIL(ptr, align)
306 * Macro to align a value to a given power-of-two. The resultant
307 * value will be of the same type as the first parameter, and
308 * will be no lower than the first parameter. Second parameter
309 * must be a power-of-two value.
310 * This function is the same as RTE_ALIGN_CEIL
312 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
315 * Macro to align a value to the multiple of given value. The resultant
316 * value will be of the same type as the first parameter and will be no lower
317 * than the first parameter.
319 #define RTE_ALIGN_MUL_CEIL(v, mul) \
320 ((((v) + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
323 * Macro to align a value to the multiple of given value. The resultant
324 * value will be of the same type as the first parameter and will be no higher
325 * than the first parameter.
327 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
328 (((v) / ((typeof(v))(mul))) * (typeof(v))(mul))
331 * Macro to align value to the nearest multiple of the given value.
332 * The resultant value might be greater than or less than the first parameter
333 * whichever difference is the lowest.
335 #define RTE_ALIGN_MUL_NEAR(v, mul) \
337 typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
338 typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
339 (ceil - (v)) > ((v) - floor) ? floor : ceil; \
343 * Checks if a pointer is aligned to a given power-of-two value
346 * The pointer whose alignment is to be checked
348 * The power-of-two value to which the ptr should be aligned
351 * True(1) where the pointer is correctly aligned, false(0) otherwise
354 rte_is_aligned(void *ptr, unsigned align)
356 return RTE_PTR_ALIGN(ptr, align) == ptr;
359 /*********** Macros for compile type checks ********/
362 * Triggers an error at compilation time if the condition is true.
364 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
366 /*********** Cache line related macros ********/
368 /** Cache line mask. */
369 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1)
371 /** Return the first cache-aligned value greater or equal to size. */
372 #define RTE_CACHE_LINE_ROUNDUP(size) \
373 (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / \
374 RTE_CACHE_LINE_SIZE))
376 /** Cache line size in terms of log2 */
377 #if RTE_CACHE_LINE_SIZE == 64
378 #define RTE_CACHE_LINE_SIZE_LOG2 6
379 #elif RTE_CACHE_LINE_SIZE == 128
380 #define RTE_CACHE_LINE_SIZE_LOG2 7
382 #error "Unsupported cache line size"
385 /** Minimum Cache line size. */
386 #define RTE_CACHE_LINE_MIN_SIZE 64
388 /** Force alignment to cache line. */
389 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
391 /** Force minimum cache line alignment. */
392 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
394 /*********** PA/IOVA type definitions ********/
396 /** Physical address */
397 typedef uint64_t phys_addr_t;
398 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
401 * IO virtual address type.
402 * When the physical addressing mode (IOVA as PA) is in use,
403 * the translation from an IO virtual address (IOVA) to a physical address
404 * is a direct mapping, i.e. the same value.
405 * Otherwise, in virtual mode (IOVA as VA), an IOMMU may do the translation.
407 typedef uint64_t rte_iova_t;
408 #define RTE_BAD_IOVA ((rte_iova_t)-1)
410 /*********** Structure alignment markers ********/
412 /** Generic marker for any place in a structure. */
413 __extension__ typedef void *RTE_MARKER[0];
414 /** Marker for 1B alignment in a structure. */
415 __extension__ typedef uint8_t RTE_MARKER8[0];
416 /** Marker for 2B alignment in a structure. */
417 __extension__ typedef uint16_t RTE_MARKER16[0];
418 /** Marker for 4B alignment in a structure. */
419 __extension__ typedef uint32_t RTE_MARKER32[0];
420 /** Marker for 8B alignment in a structure. */
421 __extension__ typedef uint64_t RTE_MARKER64[0];
424 * Combines 32b inputs most significant set bits into the least
425 * significant bits to construct a value with the same MSBs as x
426 * but all 1's under it.
429 * The integer whose MSBs need to be combined with its LSBs
431 * The combined value.
433 static inline uint32_t
434 rte_combine32ms1b(uint32_t x)
446 * Combines 64b inputs most significant set bits into the least
447 * significant bits to construct a value with the same MSBs as x
448 * but all 1's under it.
451 * The integer whose MSBs need to be combined with its LSBs
453 * The combined value.
455 static inline uint64_t
456 rte_combine64ms1b(uint64_t v)
468 /*********** Macros to work with powers of 2 ********/
471 * Macro to return 1 if n is a power of 2, 0 otherwise
473 #define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))
476 * Returns true if n is a power of 2
479 * @return 1 if true, 0 otherwise
482 rte_is_power_of_2(uint32_t n)
484 return n && !(n & (n - 1));
488 * Aligns input parameter to the next power of 2
491 * The integer value to align
494 * Input parameter aligned to the next power of 2
496 static inline uint32_t
497 rte_align32pow2(uint32_t x)
500 x = rte_combine32ms1b(x);
506 * Aligns input parameter to the previous power of 2
509 * The integer value to align
512 * Input parameter aligned to the previous power of 2
514 static inline uint32_t
515 rte_align32prevpow2(uint32_t x)
517 x = rte_combine32ms1b(x);
523 * Aligns 64b input parameter to the next power of 2
526 * The 64b value to align
529 * Input parameter aligned to the next power of 2
531 static inline uint64_t
532 rte_align64pow2(uint64_t v)
535 v = rte_combine64ms1b(v);
541 * Aligns 64b input parameter to the previous power of 2
544 * The 64b value to align
547 * Input parameter aligned to the previous power of 2
549 static inline uint64_t
550 rte_align64prevpow2(uint64_t v)
552 v = rte_combine64ms1b(v);
557 /*********** Macros for calculating min and max **********/
560 * Macro to return the minimum of two numbers
562 #define RTE_MIN(a, b) \
564 typeof (a) _a = (a); \
565 typeof (b) _b = (b); \
570 * Macro to return the maximum of two numbers
572 #define RTE_MAX(a, b) \
574 typeof (a) _a = (a); \
575 typeof (b) _b = (b); \
579 /*********** Other general functions / macros ********/
582 * Searches the input parameter for the least significant set bit
583 * (starting from zero).
584 * If a least significant 1 bit is found, its bit index is returned.
585 * If the content of the input parameter is zero, then the content of the return
586 * value is undefined.
588 * input parameter, should not be zero.
590 * least significant set bit in the input parameter.
592 static inline uint32_t
593 rte_bsf32(uint32_t v)
595 return (uint32_t)__builtin_ctz(v);
599 * Searches the input parameter for the least significant set bit
600 * (starting from zero). Safe version (checks for input parameter being zero).
602 * @warning ``pos`` must be a valid pointer. It is not checked!
605 * The input parameter.
607 * If ``v`` was not 0, this value will contain position of least significant
608 * bit within the input parameter.
610 * Returns 0 if ``v`` was 0, otherwise returns 1.
613 rte_bsf32_safe(uint64_t v, uint32_t *pos)
623 * Return the rounded-up log2 of a integer.
625 * @note Contrary to the logarithm mathematical operation,
626 * rte_log2_u32(0) == 0 and not -inf.
629 * The input parameter.
631 * The rounded-up log2 of the input, or 0 if the input is 0.
633 static inline uint32_t
634 rte_log2_u32(uint32_t v)
638 v = rte_align32pow2(v);
644 * Return the last (most-significant) bit set.
646 * @note The last (most significant) bit is at position 32.
647 * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
650 * The input parameter.
652 * The last (most-significant) bit set, or 0 if the input is 0.
655 rte_fls_u32(uint32_t x)
657 return (x == 0) ? 0 : 32 - __builtin_clz(x);
661 * Searches the input parameter for the least significant set bit
662 * (starting from zero).
663 * If a least significant 1 bit is found, its bit index is returned.
664 * If the content of the input parameter is zero, then the content of the return
665 * value is undefined.
667 * input parameter, should not be zero.
669 * least significant set bit in the input parameter.
672 rte_bsf64(uint64_t v)
674 return (uint32_t)__builtin_ctzll(v);
678 * Searches the input parameter for the least significant set bit
679 * (starting from zero). Safe version (checks for input parameter being zero).
681 * @warning ``pos`` must be a valid pointer. It is not checked!
684 * The input parameter.
686 * If ``v`` was not 0, this value will contain position of least significant
687 * bit within the input parameter.
689 * Returns 0 if ``v`` was 0, otherwise returns 1.
692 rte_bsf64_safe(uint64_t v, uint32_t *pos)
702 * Return the last (most-significant) bit set.
704 * @note The last (most significant) bit is at position 64.
705 * @note rte_fls_u64(0) = 0, rte_fls_u64(1) = 1,
706 * rte_fls_u64(0x8000000000000000) = 64
709 * The input parameter.
711 * The last (most-significant) bit set, or 0 if the input is 0.
714 rte_fls_u64(uint64_t x)
716 return (x == 0) ? 0 : 64 - __builtin_clzll(x);
720 * Return the rounded-up log2 of a 64-bit integer.
722 * @note Contrary to the logarithm mathematical operation,
723 * rte_log2_u64(0) == 0 and not -inf.
726 * The input parameter.
728 * The rounded-up log2 of the input, or 0 if the input is 0.
730 static inline uint32_t
731 rte_log2_u64(uint64_t v)
735 v = rte_align64pow2(v);
736 /* we checked for v being 0 already, so no undefined behavior */
741 /** Return the offset of a field in a structure. */
742 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
746 * Return pointer to the wrapping struct instance.
756 * struct child *x = obtain(...);
757 * struct wrapper *w = container_of(x, struct wrapper, c);
760 #define container_of(ptr, type, member) __extension__ ({ \
761 const typeof(((type *)0)->member) *_ptr = (ptr); \
762 __rte_unused type *_target_ptr = \
764 (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
769 * Get the size of a field in a structure.
772 * The type of the structure.
774 * The field in the structure.
776 * The size of the field in the structure, in bytes.
778 #define RTE_SIZEOF_FIELD(type, field) (sizeof(((type *)0)->field))
780 #define _RTE_STR(x) #x
781 /** Take a macro value and get a string version of it */
782 #define RTE_STR(x) _RTE_STR(x)
785 * ISO C helpers to modify format strings using variadic macros.
786 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
787 * An empty %s argument is appended to avoid a dangling comma.
789 #define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
790 #define RTE_FMT_HEAD(fmt, ...) fmt
791 #define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__
793 /** Mask value of type "tp" for the first "ln" bit set. */
794 #define RTE_LEN2MASK(ln, tp) \
795 ((tp)((uint64_t)-1 >> (sizeof(uint64_t) * CHAR_BIT - (ln))))
797 /** Number of elements in the array. */
798 #define RTE_DIM(a) (sizeof (a) / sizeof ((a)[0]))
801 * Converts a numeric string to the equivalent uint64_t value.
802 * As well as straight number conversion, also recognises the suffixes
803 * k, m and g for kilobytes, megabytes and gigabytes respectively.
805 * If a negative number is passed in i.e. a string with the first non-black
806 * character being "-", zero is returned. Zero is also returned in the case of
807 * an error with the strtoull call in the function.
810 * String containing number to convert.
814 static inline uint64_t
815 rte_str_to_size(const char *str)
818 unsigned long long size;
820 while (isspace((int)*str))
826 size = strtoull(str, &endptr, 0);
831 endptr++; /* allow 1 space gap */
834 case 'G': case 'g': size *= 1024; /* fall-through */
835 case 'M': case 'm': size *= 1024; /* fall-through */
836 case 'K': case 'k': size *= 1024; /* fall-through */
844 * Function to terminate the application immediately, printing an error
845 * message and returning the exit_code back to the shell.
847 * This function never returns
850 * The exit code to be returned by the application
852 * The format string to be used for printing the message. This can include
853 * printf format characters which will be expanded using any further parameters
857 rte_exit(int exit_code, const char *format, ...)
858 __rte_format_printf(2, 3);