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))
196 * Hint function in the hot path
198 #define __rte_hot __attribute__((hot))
200 /*********** Macros for pointer arithmetic ********/
203 * add a byte-value offset to a pointer
205 #define RTE_PTR_ADD(ptr, x) ((void*)((uintptr_t)(ptr) + (x)))
208 * subtract a byte-value offset from a pointer
210 #define RTE_PTR_SUB(ptr, x) ((void*)((uintptr_t)ptr - (x)))
213 * get the difference between two pointer values, i.e. how far apart
214 * in bytes are the locations they point two. It is assumed that
215 * ptr1 is greater than ptr2.
217 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
220 * Workaround to cast a const field of a structure to non-const type.
222 #define RTE_CAST_FIELD(var, field, type) \
223 (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
225 /*********** Macros/static functions for doing alignment ********/
229 * Macro to align a pointer to a given power-of-two. The resultant
230 * pointer will be a pointer of the same type as the first parameter, and
231 * point to an address no higher than the first parameter. Second parameter
232 * must be a power-of-two value.
234 #define RTE_PTR_ALIGN_FLOOR(ptr, align) \
235 ((typeof(ptr))RTE_ALIGN_FLOOR((uintptr_t)ptr, align))
238 * Macro to align a value to a given power-of-two. The resultant value
239 * will be of the same type as the first parameter, and will be no
240 * bigger than the first parameter. Second parameter must be a
241 * power-of-two value.
243 #define RTE_ALIGN_FLOOR(val, align) \
244 (typeof(val))((val) & (~((typeof(val))((align) - 1))))
247 * Macro to align a pointer to a given power-of-two. The resultant
248 * pointer will be a pointer of the same type as the first parameter, and
249 * point to an address no lower than the first parameter. Second parameter
250 * must be a power-of-two value.
252 #define RTE_PTR_ALIGN_CEIL(ptr, align) \
253 RTE_PTR_ALIGN_FLOOR((typeof(ptr))RTE_PTR_ADD(ptr, (align) - 1), align)
256 * Macro to align a value to a given power-of-two. The resultant value
257 * will be of the same type as the first parameter, and will be no lower
258 * than the first parameter. Second parameter must be a power-of-two
261 #define RTE_ALIGN_CEIL(val, align) \
262 RTE_ALIGN_FLOOR(((val) + ((typeof(val)) (align) - 1)), align)
265 * Macro to align a pointer to a given power-of-two. The resultant
266 * pointer will be a pointer of the same type as the first parameter, and
267 * point to an address no lower than the first parameter. Second parameter
268 * must be a power-of-two value.
269 * This function is the same as RTE_PTR_ALIGN_CEIL
271 #define RTE_PTR_ALIGN(ptr, align) RTE_PTR_ALIGN_CEIL(ptr, align)
274 * Macro to align a value to a given power-of-two. The resultant
275 * value will be of the same type as the first parameter, and
276 * will be no lower than the first parameter. Second parameter
277 * must be a power-of-two value.
278 * This function is the same as RTE_ALIGN_CEIL
280 #define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
283 * Macro to align a value to the multiple of given value. The resultant
284 * value will be of the same type as the first parameter and will be no lower
285 * than the first parameter.
287 #define RTE_ALIGN_MUL_CEIL(v, mul) \
288 (((v + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
291 * Macro to align a value to the multiple of given value. The resultant
292 * value will be of the same type as the first parameter and will be no higher
293 * than the first parameter.
295 #define RTE_ALIGN_MUL_FLOOR(v, mul) \
296 ((v / ((typeof(v))(mul))) * (typeof(v))(mul))
299 * Macro to align value to the nearest multiple of the given value.
300 * The resultant value might be greater than or less than the first parameter
301 * whichever difference is the lowest.
303 #define RTE_ALIGN_MUL_NEAR(v, mul) \
305 typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
306 typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
307 (ceil - v) > (v - floor) ? floor : ceil; \
311 * Checks if a pointer is aligned to a given power-of-two value
314 * The pointer whose alignment is to be checked
316 * The power-of-two value to which the ptr should be aligned
319 * True(1) where the pointer is correctly aligned, false(0) otherwise
322 rte_is_aligned(void *ptr, unsigned align)
324 return RTE_PTR_ALIGN(ptr, align) == ptr;
327 /*********** Macros for compile type checks ********/
330 * Triggers an error at compilation time if the condition is true.
332 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
334 /*********** Cache line related macros ********/
336 /** Cache line mask. */
337 #define RTE_CACHE_LINE_MASK (RTE_CACHE_LINE_SIZE-1)
339 /** Return the first cache-aligned value greater or equal to size. */
340 #define RTE_CACHE_LINE_ROUNDUP(size) \
341 (RTE_CACHE_LINE_SIZE * ((size + RTE_CACHE_LINE_SIZE - 1) / \
342 RTE_CACHE_LINE_SIZE))
344 /** Cache line size in terms of log2 */
345 #if RTE_CACHE_LINE_SIZE == 64
346 #define RTE_CACHE_LINE_SIZE_LOG2 6
347 #elif RTE_CACHE_LINE_SIZE == 128
348 #define RTE_CACHE_LINE_SIZE_LOG2 7
350 #error "Unsupported cache line size"
353 /** Minimum Cache line size. */
354 #define RTE_CACHE_LINE_MIN_SIZE 64
356 /** Force alignment to cache line. */
357 #define __rte_cache_aligned __rte_aligned(RTE_CACHE_LINE_SIZE)
359 /** Force minimum cache line alignment. */
360 #define __rte_cache_min_aligned __rte_aligned(RTE_CACHE_LINE_MIN_SIZE)
362 /*********** PA/IOVA type definitions ********/
364 /** Physical address */
365 typedef uint64_t phys_addr_t;
366 #define RTE_BAD_PHYS_ADDR ((phys_addr_t)-1)
369 * IO virtual address type.
370 * When the physical addressing mode (IOVA as PA) is in use,
371 * the translation from an IO virtual address (IOVA) to a physical address
372 * is a direct mapping, i.e. the same value.
373 * Otherwise, in virtual mode (IOVA as VA), an IOMMU may do the translation.
375 typedef uint64_t rte_iova_t;
376 #define RTE_BAD_IOVA ((rte_iova_t)-1)
378 /*********** Structure alignment markers ********/
380 /** Generic marker for any place in a structure. */
381 __extension__ typedef void *RTE_MARKER[0];
382 /** Marker for 1B alignment in a structure. */
383 __extension__ typedef uint8_t RTE_MARKER8[0];
384 /** Marker for 2B alignment in a structure. */
385 __extension__ typedef uint16_t RTE_MARKER16[0];
386 /** Marker for 4B alignment in a structure. */
387 __extension__ typedef uint32_t RTE_MARKER32[0];
388 /** Marker for 8B alignment in a structure. */
389 __extension__ typedef uint64_t RTE_MARKER64[0];
392 * Combines 32b inputs most significant set bits into the least
393 * significant bits to construct a value with the same MSBs as x
394 * but all 1's under it.
397 * The integer whose MSBs need to be combined with its LSBs
399 * The combined value.
401 static inline uint32_t
402 rte_combine32ms1b(register uint32_t x)
414 * Combines 64b inputs most significant set bits into the least
415 * significant bits to construct a value with the same MSBs as x
416 * but all 1's under it.
419 * The integer whose MSBs need to be combined with its LSBs
421 * The combined value.
423 static inline uint64_t
424 rte_combine64ms1b(register uint64_t v)
436 /*********** Macros to work with powers of 2 ********/
439 * Macro to return 1 if n is a power of 2, 0 otherwise
441 #define RTE_IS_POWER_OF_2(n) ((n) && !(((n) - 1) & (n)))
444 * Returns true if n is a power of 2
447 * @return 1 if true, 0 otherwise
450 rte_is_power_of_2(uint32_t n)
452 return n && !(n & (n - 1));
456 * Aligns input parameter to the next power of 2
459 * The integer value to align
462 * Input parameter aligned to the next power of 2
464 static inline uint32_t
465 rte_align32pow2(uint32_t x)
468 x = rte_combine32ms1b(x);
474 * Aligns input parameter to the previous power of 2
477 * The integer value to align
480 * Input parameter aligned to the previous power of 2
482 static inline uint32_t
483 rte_align32prevpow2(uint32_t x)
485 x = rte_combine32ms1b(x);
491 * Aligns 64b input parameter to the next power of 2
494 * The 64b value to align
497 * Input parameter aligned to the next power of 2
499 static inline uint64_t
500 rte_align64pow2(uint64_t v)
503 v = rte_combine64ms1b(v);
509 * Aligns 64b input parameter to the previous power of 2
512 * The 64b value to align
515 * Input parameter aligned to the previous power of 2
517 static inline uint64_t
518 rte_align64prevpow2(uint64_t v)
520 v = rte_combine64ms1b(v);
525 /*********** Macros for calculating min and max **********/
528 * Macro to return the minimum of two numbers
530 #define RTE_MIN(a, b) \
532 typeof (a) _a = (a); \
533 typeof (b) _b = (b); \
538 * Macro to return the maximum of two numbers
540 #define RTE_MAX(a, b) \
542 typeof (a) _a = (a); \
543 typeof (b) _b = (b); \
547 /*********** Other general functions / macros ********/
550 * Searches the input parameter for the least significant set bit
551 * (starting from zero).
552 * If a least significant 1 bit is found, its bit index is returned.
553 * If the content of the input parameter is zero, then the content of the return
554 * value is undefined.
556 * input parameter, should not be zero.
558 * least significant set bit in the input parameter.
560 static inline uint32_t
561 rte_bsf32(uint32_t v)
563 return (uint32_t)__builtin_ctz(v);
567 * Searches the input parameter for the least significant set bit
568 * (starting from zero). Safe version (checks for input parameter being zero).
570 * @warning ``pos`` must be a valid pointer. It is not checked!
573 * The input parameter.
575 * If ``v`` was not 0, this value will contain position of least significant
576 * bit within the input parameter.
578 * Returns 0 if ``v`` was 0, otherwise returns 1.
581 rte_bsf32_safe(uint64_t v, uint32_t *pos)
591 * Return the rounded-up log2 of a integer.
593 * @note Contrary to the logarithm mathematical operation,
594 * rte_log2_u32(0) == 0 and not -inf.
597 * The input parameter.
599 * The rounded-up log2 of the input, or 0 if the input is 0.
601 static inline uint32_t
602 rte_log2_u32(uint32_t v)
606 v = rte_align32pow2(v);
612 * Return the last (most-significant) bit set.
614 * @note The last (most significant) bit is at position 32.
615 * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32
618 * The input parameter.
620 * The last (most-significant) bit set, or 0 if the input is 0.
623 rte_fls_u32(uint32_t x)
625 return (x == 0) ? 0 : 32 - __builtin_clz(x);
629 * Searches the input parameter for the least significant set bit
630 * (starting from zero).
631 * If a least significant 1 bit is found, its bit index is returned.
632 * If the content of the input parameter is zero, then the content of the return
633 * value is undefined.
635 * input parameter, should not be zero.
637 * least significant set bit in the input parameter.
640 rte_bsf64(uint64_t v)
642 return (uint32_t)__builtin_ctzll(v);
646 * Searches the input parameter for the least significant set bit
647 * (starting from zero). Safe version (checks for input parameter being zero).
649 * @warning ``pos`` must be a valid pointer. It is not checked!
652 * The input parameter.
654 * If ``v`` was not 0, this value will contain position of least significant
655 * bit within the input parameter.
657 * Returns 0 if ``v`` was 0, otherwise returns 1.
660 rte_bsf64_safe(uint64_t v, uint32_t *pos)
670 * Return the last (most-significant) bit set.
672 * @note The last (most significant) bit is at position 64.
673 * @note rte_fls_u64(0) = 0, rte_fls_u64(1) = 1,
674 * rte_fls_u64(0x8000000000000000) = 64
677 * The input parameter.
679 * The last (most-significant) bit set, or 0 if the input is 0.
682 rte_fls_u64(uint64_t x)
684 return (x == 0) ? 0 : 64 - __builtin_clzll(x);
688 * Return the rounded-up log2 of a 64-bit integer.
690 * @note Contrary to the logarithm mathematical operation,
691 * rte_log2_u64(0) == 0 and not -inf.
694 * The input parameter.
696 * The rounded-up log2 of the input, or 0 if the input is 0.
698 static inline uint32_t
699 rte_log2_u64(uint64_t v)
703 v = rte_align64pow2(v);
704 /* we checked for v being 0 already, so no undefined behavior */
709 /** Return the offset of a field in a structure. */
710 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
714 * Return pointer to the wrapping struct instance.
724 * struct child *x = obtain(...);
725 * struct wrapper *w = container_of(x, struct wrapper, c);
728 #define container_of(ptr, type, member) __extension__ ({ \
729 const typeof(((type *)0)->member) *_ptr = (ptr); \
730 __rte_unused type *_target_ptr = \
732 (type *)(((uintptr_t)_ptr) - offsetof(type, member)); \
737 * Get the size of a field in a structure.
740 * The type of the structure.
742 * The field in the structure.
744 * The size of the field in the structure, in bytes.
746 #define RTE_SIZEOF_FIELD(type, field) (sizeof(((type *)0)->field))
748 #define _RTE_STR(x) #x
749 /** Take a macro value and get a string version of it */
750 #define RTE_STR(x) _RTE_STR(x)
753 * ISO C helpers to modify format strings using variadic macros.
754 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
755 * An empty %s argument is appended to avoid a dangling comma.
757 #define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
758 #define RTE_FMT_HEAD(fmt, ...) fmt
759 #define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__
761 /** Mask value of type "tp" for the first "ln" bit set. */
762 #define RTE_LEN2MASK(ln, tp) \
763 ((tp)((uint64_t)-1 >> (sizeof(uint64_t) * CHAR_BIT - (ln))))
765 /** Number of elements in the array. */
766 #define RTE_DIM(a) (sizeof (a) / sizeof ((a)[0]))
769 * Converts a numeric string to the equivalent uint64_t value.
770 * As well as straight number conversion, also recognises the suffixes
771 * k, m and g for kilobytes, megabytes and gigabytes respectively.
773 * If a negative number is passed in i.e. a string with the first non-black
774 * character being "-", zero is returned. Zero is also returned in the case of
775 * an error with the strtoull call in the function.
778 * String containing number to convert.
782 static inline uint64_t
783 rte_str_to_size(const char *str)
786 unsigned long long size;
788 while (isspace((int)*str))
794 size = strtoull(str, &endptr, 0);
799 endptr++; /* allow 1 space gap */
802 case 'G': case 'g': size *= 1024; /* fall-through */
803 case 'M': case 'm': size *= 1024; /* fall-through */
804 case 'K': case 'k': size *= 1024; /* fall-through */
812 * Function to terminate the application immediately, printing an error
813 * message and returning the exit_code back to the shell.
815 * This function never returns
818 * The exit code to be returned by the application
820 * The format string to be used for printing the message. This can include
821 * printf format characters which will be expanded using any further parameters
825 rte_exit(int exit_code, const char *format, ...)
826 __attribute__((noreturn))
827 __rte_format_printf(2, 3);