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)))
137 #define RTE_PRIORITY_LOG 101
138 #define RTE_PRIORITY_BUS 110
139 #define RTE_PRIORITY_CLASS 120
140 #define RTE_PRIORITY_LAST 65535
142 #define RTE_PRIO(prio) \
143 RTE_PRIORITY_ ## prio
146 * Run function before main() with high priority.
149 * Constructor function.
151 * Priority number must be above 100.
152 * Lowest number is the first to run.
154 #ifndef RTE_INIT_PRIO /* Allow to override from EAL */
155 #define RTE_INIT_PRIO(func, prio) \
156 static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
160 * Run function before main() with low priority.
162 * The constructor will be run after prioritized constructors.
165 * Constructor function.
167 #define RTE_INIT(func) \
168 RTE_INIT_PRIO(func, LAST)
171 * Run after main() with low priority.
174 * Destructor function name.
176 * Priority number must be above 100.
177 * Lowest number is the last to run.
179 #ifndef RTE_FINI_PRIO /* Allow to override from EAL */
180 #define RTE_FINI_PRIO(func, prio) \
181 static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
185 * Run after main() with high priority.
187 * The destructor will be run *before* prioritized destructors.
190 * Destructor function name.
192 #define RTE_FINI(func) \
193 RTE_FINI_PRIO(func, LAST)
196 * Hint never returning function
198 #define __rte_noreturn __attribute__((noreturn))
201 * Force a function to be inlined
203 #define __rte_always_inline inline __attribute__((always_inline))
206 * Force a function to be noinlined
208 #define __rte_noinline __attribute__((noinline))
211 * Hint function in the hot path
213 #define __rte_hot __attribute__((hot))
216 * Hint function in the cold path
218 #define __rte_cold __attribute__((cold))
220 /*********** Macros for pointer arithmetic ********/
223 * add a byte-value offset to a pointer
225 #define RTE_PTR_ADD(ptr, x) ((void*)((uintptr_t)(ptr) + (x)))
228 * subtract a byte-value offset from a pointer
230 #define RTE_PTR_SUB(ptr, x) ((void*)((uintptr_t)ptr - (x)))
233 * get the difference between two pointer values, i.e. how far apart
234 * in bytes are the locations they point two. It is assumed that
235 * ptr1 is greater than ptr2.
237 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
240 * Workaround to cast a const field of a structure to non-const type.
242 #define RTE_CAST_FIELD(var, field, type) \
243 (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
245 /*********** Macros/static functions for doing alignment ********/
249 * Macro to align a pointer to a given power-of-two. The resultant
250 * pointer will be a pointer of the same type as the first parameter, and
251 * point to an address no higher than the first parameter. Second parameter
252 * must be a power-of-two value.
254 #define RTE_PTR_ALIGN_FLOOR(ptr, align) \
255 ((typeof(ptr))RTE_ALIGN_FLOOR((uintptr_t)ptr, align))
258 * Macro to align a value to a given power-of-two. The resultant value
259 * will be of the same type as the first parameter, and will be no
260 * bigger than the first parameter. Second parameter must be a
261 * power-of-two value.
263 #define RTE_ALIGN_FLOOR(val, align) \
264 (typeof(val))((val) & (~((typeof(val))((align) - 1))))
267 * Macro to align a pointer to a given power-of-two. The resultant
268 * pointer will be a pointer of the same type as the first parameter, and
269 * point to an address no lower than the first parameter. Second parameter
270 * must be a power-of-two value.
272 #define RTE_PTR_ALIGN_CEIL(ptr, align) \
273 RTE_PTR_ALIGN_FLOOR((typeof(ptr))RTE_PTR_ADD(ptr, (align) - 1), align)
276 * Macro to align a value to a given power-of-two. The resultant value
277 * will be of the same type as the first parameter, and will be no lower
278 * than the first parameter. Second parameter must be a power-of-two
281 #define RTE_ALIGN_CEIL(val, align) \
282 RTE_ALIGN_FLOOR(((val) + ((typeof(val)) (align) - 1)), align)
285 * Macro to align a pointer to a given power-of-two. The resultant
286 * pointer will be a pointer of the same type as the first parameter, and
287 * point to an address no lower than the first parameter. Second parameter
288 * must be a power-of-two value.
289 * This function is the same as RTE_PTR_ALIGN_CEIL
291 #define RTE_PTR_ALIGN(ptr, align) RTE_PTR_ALIGN_CEIL(ptr, align)
294 * Macro to align a value to a given power-of-two. The resultant
295 * value will be of the same type as the first parameter, and
296 * will be no lower than the first parameter. Second parameter
297 * must be a power-of-two value.
298 * This function is the same as RTE_ALIGN_CEIL
300 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
303 * Macro to align a value to the multiple of given value. The resultant
304 * value will be of the same type as the first parameter and will be no lower
305 * than the first parameter.
307 #define RTE_ALIGN_MUL_CEIL(v, mul) \
308 ((((v) + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
311 * Macro to align a value to the multiple of given value. The resultant
312 * value will be of the same type as the first parameter and will be no higher
313 * than the first parameter.
315 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
316 (((v) / ((typeof(v))(mul))) * (typeof(v))(mul))
319 * Macro to align value to the nearest multiple of the given value.
320 * The resultant value might be greater than or less than the first parameter
321 * whichever difference is the lowest.
323 #define RTE_ALIGN_MUL_NEAR(v, mul) \
325 typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
326 typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
327 (ceil - (v)) > ((v) - floor) ? floor : ceil; \
331 * Checks if a pointer is aligned to a given power-of-two value
334 * The pointer whose alignment is to be checked
336 * The power-of-two value to which the ptr should be aligned
339 * True(1) where the pointer is correctly aligned, false(0) otherwise
342 rte_is_aligned(void *ptr, unsigned align)
344 return RTE_PTR_ALIGN(ptr, align) == ptr;
347 /*********** Macros for compile type checks ********/
350 * Triggers an error at compilation time if the condition is true.
352 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
354 /*********** Cache line related macros ********/
356 /** Cache line mask. */
357 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1)
359 /** Return the first cache-aligned value greater or equal to size. */
360 #define RTE_CACHE_LINE_ROUNDUP(size) \
361 (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / \
362 RTE_CACHE_LINE_SIZE))
364 /** Cache line size in terms of log2 */
365 #if RTE_CACHE_LINE_SIZE == 64
366 #define RTE_CACHE_LINE_SIZE_LOG2 6
367 #elif RTE_CACHE_LINE_SIZE == 128
368 #define RTE_CACHE_LINE_SIZE_LOG2 7
370 #error "Unsupported cache line size"
373 /** Minimum Cache line size. */
374 #define RTE_CACHE_LINE_MIN_SIZE 64
376 /** Force alignment to cache line. */
377 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
379 /** Force minimum cache line alignment. */
380 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
382 /*********** PA/IOVA type definitions ********/
384 /** Physical address */
385 typedef uint64_t phys_addr_t;
386 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
389 * IO virtual address type.
390 * When the physical addressing mode (IOVA as PA) is in use,
391 * the translation from an IO virtual address (IOVA) to a physical address
392 * is a direct mapping, i.e. the same value.
393 * Otherwise, in virtual mode (IOVA as VA), an IOMMU may do the translation.
395 typedef uint64_t rte_iova_t;
396 #define RTE_BAD_IOVA ((rte_iova_t)-1)
398 /*********** Structure alignment markers ********/
400 /** Generic marker for any place in a structure. */
401 __extension__ typedef void *RTE_MARKER[0];
402 /** Marker for 1B alignment in a structure. */
403 __extension__ typedef uint8_t RTE_MARKER8[0];
404 /** Marker for 2B alignment in a structure. */
405 __extension__ typedef uint16_t RTE_MARKER16[0];
406 /** Marker for 4B alignment in a structure. */
407 __extension__ typedef uint32_t RTE_MARKER32[0];
408 /** Marker for 8B alignment in a structure. */
409 __extension__ typedef uint64_t RTE_MARKER64[0];
412 * Combines 32b inputs most significant set bits into the least
413 * significant bits to construct a value with the same MSBs as x
414 * but all 1's under it.
417 * The integer whose MSBs need to be combined with its LSBs
419 * The combined value.
421 static inline uint32_t
422 rte_combine32ms1b(uint32_t x)
434 * Combines 64b inputs most significant set bits into the least
435 * significant bits to construct a value with the same MSBs as x
436 * but all 1's under it.
439 * The integer whose MSBs need to be combined with its LSBs
441 * The combined value.
443 static inline uint64_t
444 rte_combine64ms1b(uint64_t v)
456 /*********** Macros to work with powers of 2 ********/
459 * Macro to return 1 if n is a power of 2, 0 otherwise
461 #define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))
464 * Returns true if n is a power of 2
467 * @return 1 if true, 0 otherwise
470 rte_is_power_of_2(uint32_t n)
472 return n && !(n & (n - 1));
476 * Aligns input parameter to the next power of 2
479 * The integer value to align
482 * Input parameter aligned to the next power of 2
484 static inline uint32_t
485 rte_align32pow2(uint32_t x)
488 x = rte_combine32ms1b(x);
494 * Aligns input parameter to the previous power of 2
497 * The integer value to align
500 * Input parameter aligned to the previous power of 2
502 static inline uint32_t
503 rte_align32prevpow2(uint32_t x)
505 x = rte_combine32ms1b(x);
511 * Aligns 64b input parameter to the next power of 2
514 * The 64b value to align
517 * Input parameter aligned to the next power of 2
519 static inline uint64_t
520 rte_align64pow2(uint64_t v)
523 v = rte_combine64ms1b(v);
529 * Aligns 64b input parameter to the previous power of 2
532 * The 64b value to align
535 * Input parameter aligned to the previous power of 2
537 static inline uint64_t
538 rte_align64prevpow2(uint64_t v)
540 v = rte_combine64ms1b(v);
545 /*********** Macros for calculating min and max **********/
548 * Macro to return the minimum of two numbers
550 #define RTE_MIN(a, b) \
552 typeof (a) _a = (a); \
553 typeof (b) _b = (b); \
558 * Macro to return the maximum of two numbers
560 #define RTE_MAX(a, b) \
562 typeof (a) _a = (a); \
563 typeof (b) _b = (b); \
567 /*********** Other general functions / macros ********/
570 * Searches the input parameter for the least significant set bit
571 * (starting from zero).
572 * If a least significant 1 bit is found, its bit index is returned.
573 * If the content of the input parameter is zero, then the content of the return
574 * value is undefined.
576 * input parameter, should not be zero.
578 * least significant set bit in the input parameter.
580 static inline uint32_t
581 rte_bsf32(uint32_t v)
583 return (uint32_t)__builtin_ctz(v);
587 * Searches the input parameter for the least significant set bit
588 * (starting from zero). Safe version (checks for input parameter being zero).
590 * @warning ``pos`` must be a valid pointer. It is not checked!
593 * The input parameter.
595 * If ``v`` was not 0, this value will contain position of least significant
596 * bit within the input parameter.
598 * Returns 0 if ``v`` was 0, otherwise returns 1.
601 rte_bsf32_safe(uint64_t v, uint32_t *pos)
611 * Return the rounded-up log2 of a integer.
613 * @note Contrary to the logarithm mathematical operation,
614 * rte_log2_u32(0) == 0 and not -inf.
617 * The input parameter.
619 * The rounded-up log2 of the input, or 0 if the input is 0.
621 static inline uint32_t
622 rte_log2_u32(uint32_t v)
626 v = rte_align32pow2(v);
632 * Return the last (most-significant) bit set.
634 * @note The last (most significant) bit is at position 32.
635 * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
638 * The input parameter.
640 * The last (most-significant) bit set, or 0 if the input is 0.
643 rte_fls_u32(uint32_t x)
645 return (x == 0) ? 0 : 32 - __builtin_clz(x);
649 * Searches the input parameter for the least significant set bit
650 * (starting from zero).
651 * If a least significant 1 bit is found, its bit index is returned.
652 * If the content of the input parameter is zero, then the content of the return
653 * value is undefined.
655 * input parameter, should not be zero.
657 * least significant set bit in the input parameter.
660 rte_bsf64(uint64_t v)
662 return (uint32_t)__builtin_ctzll(v);
666 * Searches the input parameter for the least significant set bit
667 * (starting from zero). Safe version (checks for input parameter being zero).
669 * @warning ``pos`` must be a valid pointer. It is not checked!
672 * The input parameter.
674 * If ``v`` was not 0, this value will contain position of least significant
675 * bit within the input parameter.
677 * Returns 0 if ``v`` was 0, otherwise returns 1.
680 rte_bsf64_safe(uint64_t v, uint32_t *pos)
690 * Return the last (most-significant) bit set.
692 * @note The last (most significant) bit is at position 64.
693 * @note rte_fls_u64(0) = 0, rte_fls_u64(1) = 1,
694 * rte_fls_u64(0x8000000000000000) = 64
697 * The input parameter.
699 * The last (most-significant) bit set, or 0 if the input is 0.
702 rte_fls_u64(uint64_t x)
704 return (x == 0) ? 0 : 64 - __builtin_clzll(x);
708 * Return the rounded-up log2 of a 64-bit integer.
710 * @note Contrary to the logarithm mathematical operation,
711 * rte_log2_u64(0) == 0 and not -inf.
714 * The input parameter.
716 * The rounded-up log2 of the input, or 0 if the input is 0.
718 static inline uint32_t
719 rte_log2_u64(uint64_t v)
723 v = rte_align64pow2(v);
724 /* we checked for v being 0 already, so no undefined behavior */
729 /** Return the offset of a field in a structure. */
730 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
734 * Return pointer to the wrapping struct instance.
744 * struct child *x = obtain(...);
745 * struct wrapper *w = container_of(x, struct wrapper, c);
748 #define container_of(ptr, type, member) __extension__ ({ \
749 const typeof(((type *)0)->member) *_ptr = (ptr); \
750 __rte_unused type *_target_ptr = \
752 (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
757 * Get the size of a field in a structure.
760 * The type of the structure.
762 * The field in the structure.
764 * The size of the field in the structure, in bytes.
766 #define RTE_SIZEOF_FIELD(type, field) (sizeof(((type *)0)->field))
768 #define _RTE_STR(x) #x
769 /** Take a macro value and get a string version of it */
770 #define RTE_STR(x) _RTE_STR(x)
773 * ISO C helpers to modify format strings using variadic macros.
774 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
775 * An empty %s argument is appended to avoid a dangling comma.
777 #define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
778 #define RTE_FMT_HEAD(fmt, ...) fmt
779 #define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__
781 /** Mask value of type "tp" for the first "ln" bit set. */
782 #define RTE_LEN2MASK(ln, tp) \
783 ((tp)((uint64_t)-1 >> (sizeof(uint64_t) * CHAR_BIT - (ln))))
785 /** Number of elements in the array. */
786 #define RTE_DIM(a) (sizeof (a) / sizeof ((a)[0]))
789 * Converts a numeric string to the equivalent uint64_t value.
790 * As well as straight number conversion, also recognises the suffixes
791 * k, m and g for kilobytes, megabytes and gigabytes respectively.
793 * If a negative number is passed in i.e. a string with the first non-black
794 * character being "-", zero is returned. Zero is also returned in the case of
795 * an error with the strtoull call in the function.
798 * String containing number to convert.
802 static inline uint64_t
803 rte_str_to_size(const char *str)
806 unsigned long long size;
808 while (isspace((int)*str))
814 size = strtoull(str, &endptr, 0);
819 endptr++; /* allow 1 space gap */
822 case 'G': case 'g': size *= 1024; /* fall-through */
823 case 'M': case 'm': size *= 1024; /* fall-through */
824 case 'K': case 'k': size *= 1024; /* fall-through */
832 * Function to terminate the application immediately, printing an error
833 * message and returning the exit_code back to the shell.
835 * This function never returns
838 * The exit code to be returned by the application
840 * The format string to be used for printing the message. This can include
841 * printf format characters which will be expanded using any further parameters
845 rte_exit(int exit_code, const char *format, ...)
846 __rte_format_printf(2, 3);