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 + \
66 #ifdef RTE_ARCH_STRICT_ALIGN
67 typedef uint64_t unaligned_uint64_t __rte_aligned(1);
68 typedef uint32_t unaligned_uint32_t __rte_aligned(1);
69 typedef uint16_t unaligned_uint16_t __rte_aligned(1);
71 typedef uint64_t unaligned_uint64_t;
72 typedef uint32_t unaligned_uint32_t;
73 typedef uint16_t unaligned_uint16_t;
79 #define __rte_aligned(a) __attribute__((__aligned__(a)))
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__))
90 * Mark a function or variable to a weak reference.
92 #define __rte_weak __attribute__((__weak__))
95 * Force symbol to be generated even if it appears to be unused.
97 #define __rte_used __attribute__((used))
99 /*********** Macros to eliminate unused variable warnings ********/
102 * short definition to mark a function parameter unused
104 #define __rte_unused __attribute__((__unused__))
107 * definition to mark a variable or function parameter as used so
108 * as to avoid a compiler warning
110 #define RTE_SET_USED(x) (void)(x)
113 * Check format string and its arguments at compile-time.
115 * GCC on Windows assumes MS-specific format string by default,
116 * even if the underlying stdio implementation is ANSI-compliant,
117 * so this must be overridden.
120 #define __rte_format_printf(format_index, first_arg) \
121 __attribute__((format(gnu_printf, format_index, first_arg)))
123 #define __rte_format_printf(format_index, first_arg) \
124 __attribute__((format(printf, format_index, first_arg)))
127 #define RTE_PRIORITY_LOG 101
128 #define RTE_PRIORITY_BUS 110
129 #define RTE_PRIORITY_CLASS 120
130 #define RTE_PRIORITY_LAST 65535
132 #define RTE_PRIO(prio) \
133 RTE_PRIORITY_ ## prio
136 * Run function before main() with high priority.
139 * Constructor function.
141 * Priority number must be above 100.
142 * Lowest number is the first to run.
144 #ifndef RTE_INIT_PRIO /* Allow to override from EAL */
145 #define RTE_INIT_PRIO(func, prio) \
146 static void __attribute__((constructor(RTE_PRIO(prio)), used)) func(void)
150 * Run function before main() with low priority.
152 * The constructor will be run after prioritized constructors.
155 * Constructor function.
157 #define RTE_INIT(func) \
158 RTE_INIT_PRIO(func, LAST)
161 * Run after main() with low priority.
164 * Destructor function name.
166 * Priority number must be above 100.
167 * Lowest number is the last to run.
169 #ifndef RTE_FINI_PRIO /* Allow to override from EAL */
170 #define RTE_FINI_PRIO(func, prio) \
171 static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
175 * Run after main() with high priority.
177 * The destructor will be run *before* prioritized destructors.
180 * Destructor function name.
182 #define RTE_FINI(func) \
183 RTE_FINI_PRIO(func, LAST)
186 * Force a function to be inlined
188 #define __rte_always_inline inline __attribute__((always_inline))
191 * Force a function to be noinlined
193 #define __rte_noinline __attribute__((noinline))
195 /*********** Macros for pointer arithmetic ********/
198 * add a byte-value offset to a pointer
200 #define RTE_PTR_ADD(ptr, x) ((void*)((uintptr_t)(ptr) + (x)))
203 * subtract a byte-value offset from a pointer
205 #define RTE_PTR_SUB(ptr, x) ((void*)((uintptr_t)ptr - (x)))
208 * get the difference between two pointer values, i.e. how far apart
209 * in bytes are the locations they point two. It is assumed that
210 * ptr1 is greater than ptr2.
212 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
215 * Workaround to cast a const field of a structure to non-const type.
217 #define RTE_CAST_FIELD(var, field, type) \
218 (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
220 /*********** Macros/static functions for doing alignment ********/
224 * Macro to align a pointer to a given power-of-two. The resultant
225 * pointer will be a pointer of the same type as the first parameter, and
226 * point to an address no higher than the first parameter. Second parameter
227 * must be a power-of-two value.
229 #define RTE_PTR_ALIGN_FLOOR(ptr, align) \
230 ((typeof(ptr))RTE_ALIGN_FLOOR((uintptr_t)ptr, align))
233 * Macro to align a value to a given power-of-two. The resultant value
234 * will be of the same type as the first parameter, and will be no
235 * bigger than the first parameter. Second parameter must be a
236 * power-of-two value.
238 #define RTE_ALIGN_FLOOR(val, align) \
239 (typeof(val))((val) & (~((typeof(val))((align) - 1))))
242 * Macro to align a pointer to a given power-of-two. The resultant
243 * pointer will be a pointer of the same type as the first parameter, and
244 * point to an address no lower than the first parameter. Second parameter
245 * must be a power-of-two value.
247 #define RTE_PTR_ALIGN_CEIL(ptr, align) \
248 RTE_PTR_ALIGN_FLOOR((typeof(ptr))RTE_PTR_ADD(ptr, (align) - 1), align)
251 * Macro to align a value to a given power-of-two. The resultant value
252 * will be of the same type as the first parameter, and will be no lower
253 * than the first parameter. Second parameter must be a power-of-two
256 #define RTE_ALIGN_CEIL(val, align) \
257 RTE_ALIGN_FLOOR(((val) + ((typeof(val)) (align) - 1)), align)
260 * Macro to align a pointer to a given power-of-two. The resultant
261 * pointer will be a pointer of the same type as the first parameter, and
262 * point to an address no lower than the first parameter. Second parameter
263 * must be a power-of-two value.
264 * This function is the same as RTE_PTR_ALIGN_CEIL
266 #define RTE_PTR_ALIGN(ptr, align) RTE_PTR_ALIGN_CEIL(ptr, align)
269 * Macro to align a value to a given power-of-two. The resultant
270 * value will be of the same type as the first parameter, and
271 * will be no lower than the first parameter. Second parameter
272 * must be a power-of-two value.
273 * This function is the same as RTE_ALIGN_CEIL
275 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
278 * Macro to align a value to the multiple of given value. The resultant
279 * value will be of the same type as the first parameter and will be no lower
280 * than the first parameter.
282 #define RTE_ALIGN_MUL_CEIL(v, mul) \
283 (((v + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
286 * Macro to align a value to the multiple of given value. The resultant
287 * value will be of the same type as the first parameter and will be no higher
288 * than the first parameter.
290 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
291 ((v / ((typeof(v))(mul))) * (typeof(v))(mul))
294 * Macro to align value to the nearest multiple of the given value.
295 * The resultant value might be greater than or less than the first parameter
296 * whichever difference is the lowest.
298 #define RTE_ALIGN_MUL_NEAR(v, mul) \
300 typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
301 typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
302 (ceil - v) > (v - floor) ? floor : ceil; \
306 * Checks if a pointer is aligned to a given power-of-two value
309 * The pointer whose alignment is to be checked
311 * The power-of-two value to which the ptr should be aligned
314 * True(1) where the pointer is correctly aligned, false(0) otherwise
317 rte_is_aligned(void *ptr, unsigned align)
319 return RTE_PTR_ALIGN(ptr, align) == ptr;
322 /*********** Macros for compile type checks ********/
325 * Triggers an error at compilation time if the condition is true.
327 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
329 /*********** Cache line related macros ********/
331 /** Cache line mask. */
332 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1)
334 /** Return the first cache-aligned value greater or equal to size. */
335 #define RTE_CACHE_LINE_ROUNDUP(size) \
336 (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / \
337 RTE_CACHE_LINE_SIZE))
339 /** Cache line size in terms of log2 */
340 #if RTE_CACHE_LINE_SIZE == 64
341 #define RTE_CACHE_LINE_SIZE_LOG2 6
342 #elif RTE_CACHE_LINE_SIZE == 128
343 #define RTE_CACHE_LINE_SIZE_LOG2 7
345 #error "Unsupported cache line size"
348 /** Minimum Cache line size. */
349 #define RTE_CACHE_LINE_MIN_SIZE 64
351 /** Force alignment to cache line. */
352 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
354 /** Force minimum cache line alignment. */
355 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
357 /*********** PA/IOVA type definitions ********/
359 /** Physical address */
360 typedef uint64_t phys_addr_t;
361 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
364 * IO virtual address type.
365 * When the physical addressing mode (IOVA as PA) is in use,
366 * the translation from an IO virtual address (IOVA) to a physical address
367 * is a direct mapping, i.e. the same value.
368 * Otherwise, in virtual mode (IOVA as VA), an IOMMU may do the translation.
370 typedef uint64_t rte_iova_t;
371 #define RTE_BAD_IOVA ((rte_iova_t)-1)
373 /*********** Structure alignment markers ********/
375 /** Generic marker for any place in a structure. */
376 __extension__ typedef void *RTE_MARKER[0];
377 /** Marker for 1B alignment in a structure. */
378 __extension__ typedef uint8_t RTE_MARKER8[0];
379 /** Marker for 2B alignment in a structure. */
380 __extension__ typedef uint16_t RTE_MARKER16[0];
381 /** Marker for 4B alignment in a structure. */
382 __extension__ typedef uint32_t RTE_MARKER32[0];
383 /** Marker for 8B alignment in a structure. */
384 __extension__ typedef uint64_t RTE_MARKER64[0];
387 * Combines 32b inputs most significant set bits into the least
388 * significant bits to construct a value with the same MSBs as x
389 * but all 1's under it.
392 * The integer whose MSBs need to be combined with its LSBs
394 * The combined value.
396 static inline uint32_t
397 rte_combine32ms1b(register uint32_t x)
409 * Combines 64b inputs most significant set bits into the least
410 * significant bits to construct a value with the same MSBs as x
411 * but all 1's under it.
414 * The integer whose MSBs need to be combined with its LSBs
416 * The combined value.
418 static inline uint64_t
419 rte_combine64ms1b(register uint64_t v)
431 /*********** Macros to work with powers of 2 ********/
434 * Macro to return 1 if n is a power of 2, 0 otherwise
436 #define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))
439 * Returns true if n is a power of 2
442 * @return 1 if true, 0 otherwise
445 rte_is_power_of_2(uint32_t n)
447 return n && !(n & (n - 1));
451 * Aligns input parameter to the next power of 2
454 * The integer value to align
457 * Input parameter aligned to the next power of 2
459 static inline uint32_t
460 rte_align32pow2(uint32_t x)
463 x = rte_combine32ms1b(x);
469 * Aligns input parameter to the previous power of 2
472 * The integer value to align
475 * Input parameter aligned to the previous power of 2
477 static inline uint32_t
478 rte_align32prevpow2(uint32_t x)
480 x = rte_combine32ms1b(x);
486 * Aligns 64b input parameter to the next power of 2
489 * The 64b value to align
492 * Input parameter aligned to the next power of 2
494 static inline uint64_t
495 rte_align64pow2(uint64_t v)
498 v = rte_combine64ms1b(v);
504 * Aligns 64b input parameter to the previous power of 2
507 * The 64b value to align
510 * Input parameter aligned to the previous power of 2
512 static inline uint64_t
513 rte_align64prevpow2(uint64_t v)
515 v = rte_combine64ms1b(v);
520 /*********** Macros for calculating min and max **********/
523 * Macro to return the minimum of two numbers
525 #define RTE_MIN(a, b) \
527 typeof (a) _a = (a); \
528 typeof (b) _b = (b); \
533 * Macro to return the maximum of two numbers
535 #define RTE_MAX(a, b) \
537 typeof (a) _a = (a); \
538 typeof (b) _b = (b); \
542 /*********** Other general functions / macros ********/
545 * Searches the input parameter for the least significant set bit
546 * (starting from zero).
547 * If a least significant 1 bit is found, its bit index is returned.
548 * If the content of the input parameter is zero, then the content of the return
549 * value is undefined.
551 * input parameter, should not be zero.
553 * least significant set bit in the input parameter.
555 static inline uint32_t
556 rte_bsf32(uint32_t v)
558 return (uint32_t)__builtin_ctz(v);
562 * Searches the input parameter for the least significant set bit
563 * (starting from zero). Safe version (checks for input parameter being zero).
565 * @warning ``pos`` must be a valid pointer. It is not checked!
568 * The input parameter.
570 * If ``v`` was not 0, this value will contain position of least significant
571 * bit within the input parameter.
573 * Returns 0 if ``v`` was 0, otherwise returns 1.
576 rte_bsf32_safe(uint64_t v, uint32_t *pos)
586 * Return the rounded-up log2 of a integer.
588 * @note Contrary to the logarithm mathematical operation,
589 * rte_log2_u32(0) == 0 and not -inf.
592 * The input parameter.
594 * The rounded-up log2 of the input, or 0 if the input is 0.
596 static inline uint32_t
597 rte_log2_u32(uint32_t v)
601 v = rte_align32pow2(v);
607 * Return the last (most-significant) bit set.
609 * @note The last (most significant) bit is at position 32.
610 * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
613 * The input parameter.
615 * The last (most-significant) bit set, or 0 if the input is 0.
618 rte_fls_u32(uint32_t x)
620 return (x == 0) ? 0 : 32 - __builtin_clz(x);
624 * Searches the input parameter for the least significant set bit
625 * (starting from zero).
626 * If a least significant 1 bit is found, its bit index is returned.
627 * If the content of the input parameter is zero, then the content of the return
628 * value is undefined.
630 * input parameter, should not be zero.
632 * least significant set bit in the input parameter.
635 rte_bsf64(uint64_t v)
637 return (uint32_t)__builtin_ctzll(v);
641 * Searches the input parameter for the least significant set bit
642 * (starting from zero). Safe version (checks for input parameter being zero).
644 * @warning ``pos`` must be a valid pointer. It is not checked!
647 * The input parameter.
649 * If ``v`` was not 0, this value will contain position of least significant
650 * bit within the input parameter.
652 * Returns 0 if ``v`` was 0, otherwise returns 1.
655 rte_bsf64_safe(uint64_t v, uint32_t *pos)
665 * Return the last (most-significant) bit set.
667 * @note The last (most significant) bit is at position 64.
668 * @note rte_fls_u64(0) = 0, rte_fls_u64(1) = 1,
669 * rte_fls_u64(0x8000000000000000) = 64
672 * The input parameter.
674 * The last (most-significant) bit set, or 0 if the input is 0.
677 rte_fls_u64(uint64_t x)
679 return (x == 0) ? 0 : 64 - __builtin_clzll(x);
683 * Return the rounded-up log2 of a 64-bit integer.
685 * @note Contrary to the logarithm mathematical operation,
686 * rte_log2_u64(0) == 0 and not -inf.
689 * The input parameter.
691 * The rounded-up log2 of the input, or 0 if the input is 0.
693 static inline uint32_t
694 rte_log2_u64(uint64_t v)
698 v = rte_align64pow2(v);
699 /* we checked for v being 0 already, so no undefined behavior */
704 /** Return the offset of a field in a structure. */
705 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
709 * Return pointer to the wrapping struct instance.
719 * struct child *x = obtain(...);
720 * struct wrapper *w = container_of(x, struct wrapper, c);
723 #define container_of(ptr, type, member) __extension__ ({ \
724 const typeof(((type *)0)->member) *_ptr = (ptr); \
725 __rte_unused type *_target_ptr = \
727 (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
732 * Get the size of a field in a structure.
735 * The type of the structure.
737 * The field in the structure.
739 * The size of the field in the structure, in bytes.
741 #define RTE_SIZEOF_FIELD(type, field) (sizeof(((type *)0)->field))
743 #define _RTE_STR(x) #x
744 /** Take a macro value and get a string version of it */
745 #define RTE_STR(x) _RTE_STR(x)
748 * ISO C helpers to modify format strings using variadic macros.
749 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
750 * An empty %s argument is appended to avoid a dangling comma.
752 #define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
753 #define RTE_FMT_HEAD(fmt, ...) fmt
754 #define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__
756 /** Mask value of type "tp" for the first "ln" bit set. */
757 #define RTE_LEN2MASK(ln, tp) \
758 ((tp)((uint64_t)-1 >> (sizeof(uint64_t) * CHAR_BIT - (ln))))
760 /** Number of elements in the array. */
761 #define RTE_DIM(a) (sizeof (a) / sizeof ((a)[0]))
764 * Converts a numeric string to the equivalent uint64_t value.
765 * As well as straight number conversion, also recognises the suffixes
766 * k, m and g for kilobytes, megabytes and gigabytes respectively.
768 * If a negative number is passed in i.e. a string with the first non-black
769 * character being "-", zero is returned. Zero is also returned in the case of
770 * an error with the strtoull call in the function.
773 * String containing number to convert.
777 static inline uint64_t
778 rte_str_to_size(const char *str)
781 unsigned long long size;
783 while (isspace((int)*str))
789 size = strtoull(str, &endptr, 0);
794 endptr++; /* allow 1 space gap */
797 case 'G': case 'g': size *= 1024; /* fall-through */
798 case 'M': case 'm': size *= 1024; /* fall-through */
799 case 'K': case 'k': size *= 1024; /* fall-through */
807 * Function to terminate the application immediately, printing an error
808 * message and returning the exit_code back to the shell.
810 * This function never returns
813 * The exit code to be returned by the application
815 * The format string to be used for printing the message. This can include
816 * printf format characters which will be expanded using any further parameters
820 rte_exit(int exit_code, const char *format, ...)
821 __attribute__((noreturn))
822 __rte_format_printf(2, 3);