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33 * version: DPDK.L.1.2.3-3
36 #ifndef _RTE_COMMON_H_
37 #define _RTE_COMMON_H_
42 * Generic, commonly-used macro and inline function definitions
55 /*********** Macros to eliminate unused variable warnings ********/
58 * short definition to mark a function parameter unused
60 #define __rte_unused __attribute__((__unused__))
63 * definition to mark a variable or function parameter as used so
64 * as to avoid a compiler warning
66 #define RTE_SET_USED(x) (void)(x)
68 /*********** Macros for pointer arithmetic ********/
71 * add a byte-value offset from a pointer
73 #define RTE_PTR_ADD(ptr, x) ((typeof(ptr))((uintptr_t)ptr + (x)))
76 * subtract a byte-value offset from a pointer
78 #define RTE_PTR_SUB(ptr, x) ((typeof(ptr))((uintptr_t)ptr - (x)))
81 * get the difference between two pointer values, i.e. how far apart
82 * in bytes are the locations they point two. It is assumed that
83 * ptr1 is greater than ptr2.
85 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
87 /*********** Macros/static functions for doing alignment ********/
90 * Function which rounds an unsigned int down to a given power-of-two value.
91 * Takes uintptr_t types as parameters, as this type of operation is most
92 * commonly done for pointer alignment. (See also RTE_ALIGN_FLOOR,
93 * RTE_ALIGN_CEIL, RTE_ALIGN, RTE_PTR_ALIGN_FLOOR, RTE_PTR_ALIGN_CEL,
94 * RTE_PTR_ALIGN macros)
96 * The value to be rounded down
98 * The power-of-two of which the result must be a multiple.
100 * Function returns a properly aligned value where align is a power-of-two.
101 * If align is not a power-of-two, result will be incorrect.
103 static inline uintptr_t
104 rte_align_floor_int(uintptr_t ptr, uintptr_t align)
106 return (ptr & ~(align - 1));
110 * Macro to align a pointer to a given power-of-two. The resultant
111 * pointer will be a pointer of the same type as the first parameter, and
112 * point to an address no higher than the first parameter. Second parameter
113 * must be a power-of-two value.
115 #define RTE_ALIGN_FLOOR(ptr, align) \
116 (typeof(ptr))rte_align_floor_int((uintptr_t)ptr, align)
119 * Macro to align a pointer to a given power-of-two. The resultant
120 * pointer will be a pointer of the same type as the first parameter, and
121 * point to an address no lower than the first parameter. Second parameter
122 * must be a power-of-two value.
124 #define RTE_ALIGN_CEIL(ptr, align) \
125 RTE_ALIGN_FLOOR(RTE_PTR_ADD(ptr, align - 1), align)
128 * Macro to align a pointer to a given power-of-two. The resultant
129 * pointer will be a pointer of the same type as the first parameter, and
130 * point to an address no lower than the first parameter. Second parameter
131 * must be a power-of-two value.
132 * This function is the same as RTE_ALIGN_CEIL
134 #define RTE_ALIGN(ptr, align) RTE_ALIGN_CEIL(ptr, align)
137 * Checks if a pointer is aligned to a given power-of-two value
140 * The pointer whose alignment is to be checked
142 * The power-of-two value to which the ptr should be aligned
145 * True(1) where the pointer is correctly aligned, false(0) otherwise
148 rte_is_aligned(void *ptr, unsigned align)
150 return RTE_ALIGN(ptr, align) == ptr;
153 /*********** Macros for compile type checks ********/
156 * Triggers an error at compilation time if the condition is true.
159 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
161 extern int RTE_BUILD_BUG_ON_detected_error;
162 #define RTE_BUILD_BUG_ON(condition) do { \
163 ((void)sizeof(char[1 - 2*!!(condition)])); \
165 RTE_BUILD_BUG_ON_detected_error = 1; \
169 /*********** Macros to work with powers of 2 ********/
172 * Returns true if n is a power of 2
175 * @return 1 if true, 0 otherwise
178 rte_is_power_of_2(uint32_t n)
180 return ((n-1) & n) == 0;
184 * Aligns input parameter to the next power of 2
187 * The integer value to algin
190 * Input parameter aligned to the next power of 2
192 static inline uint32_t
193 rte_align32pow2(uint32_t x)
205 /*********** Macros for calculating min and max **********/
208 * Macro to return the minimum of two numbers
210 #define RTE_MIN(a, b) ({ \
211 typeof (a) _a = (a); \
212 typeof (b) _b = (b); \
217 * Macro to return the maximum of two numbers
219 #define RTE_MAX(a, b) ({ \
220 typeof (a) _a = (a); \
221 typeof (b) _b = (b); \
225 /*********** Other general functions / macros ********/
228 * PAUSE instruction for tight loops (avoid busy waiting)
233 asm volatile ("pause");
237 /** Return the offset of a field in a structure. */
238 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
241 #define _RTE_STR(x) #x
242 /** Take a macro value and get a string version of it */
243 #define RTE_STR(x) _RTE_STR(x)
246 * Converts a numeric string to the equivalent uint64_t value.
247 * As well as straight number conversion, also recognises the suffixes
248 * k, m and g for kilobytes, megabytes and gigabytes respectively.
250 * If a negative number is passed in i.e. a string with the first non-black
251 * character being "-", zero is returned. Zero is also returned in the case of
252 * an error with the strtoull call in the function.
255 * String containing number to convert.
259 static inline uint64_t
260 rte_str_to_size(const char *str)
263 unsigned long long size;
265 while (isspace((int)*str))
271 size = strtoull(str, &endptr, 0);
276 endptr++; /* allow 1 space gap */
279 case 'G': case 'g': size *= 1024; /* fall-through */
280 case 'M': case 'm': size *= 1024; /* fall-through */
281 case 'K': case 'k': size *= 1024; /* fall-through */
289 * Function to terminate the application immediately, printing an error
290 * message and returning the exit_code back to the shell.
292 * This function never returns
295 * The exit code to be returned by the application
297 * The format string to be used for printing the message. This can include
298 * printf format characters which will be expanded using any further parameters
302 rte_exit(int exit_code, const char *format, ...)
303 __attribute__((noreturn))
304 __attribute__((format(printf, 2, 3)));