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35 #ifndef _RTE_COMMON_H_
36 #define _RTE_COMMON_H_
41 * Generic, commonly-used macro and inline function definitions
54 /*********** Macros to eliminate unused variable warnings ********/
57 * short definition to mark a function parameter unused
59 #define __rte_unused __attribute__((__unused__))
62 * definition to mark a variable or function parameter as used so
63 * as to avoid a compiler warning
65 #define RTE_SET_USED(x) (void)(x)
67 /*********** Macros for pointer arithmetic ********/
70 * add a byte-value offset from a pointer
72 #define RTE_PTR_ADD(ptr, x) ((typeof(ptr))((uintptr_t)ptr + (x)))
75 * subtract a byte-value offset from a pointer
77 #define RTE_PTR_SUB(ptr, x) ((typeof(ptr))((uintptr_t)ptr - (x)))
80 * get the difference between two pointer values, i.e. how far apart
81 * in bytes are the locations they point two. It is assumed that
82 * ptr1 is greater than ptr2.
84 #define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
86 /*********** Macros/static functions for doing alignment ********/
89 * Function which rounds an unsigned int down to a given power-of-two value.
90 * Takes uintptr_t types as parameters, as this type of operation is most
91 * commonly done for pointer alignment. (See also RTE_ALIGN_FLOOR,
92 * RTE_ALIGN_CEIL, RTE_ALIGN, RTE_PTR_ALIGN_FLOOR, RTE_PTR_ALIGN_CEL,
93 * RTE_PTR_ALIGN macros)
95 * The value to be rounded down
97 * The power-of-two of which the result must be a multiple.
99 * Function returns a properly aligned value where align is a power-of-two.
100 * If align is not a power-of-two, result will be incorrect.
102 static inline uintptr_t
103 rte_align_floor_int(uintptr_t ptr, uintptr_t align)
105 return (ptr & ~(align - 1));
109 * Macro to align a pointer to a given power-of-two. The resultant
110 * pointer will be a pointer of the same type as the first parameter, and
111 * point to an address no higher than the first parameter. Second parameter
112 * must be a power-of-two value.
114 #define RTE_ALIGN_FLOOR(ptr, align) \
115 (typeof(ptr))rte_align_floor_int((uintptr_t)ptr, align)
118 * Macro to align a pointer to a given power-of-two. The resultant
119 * pointer will be a pointer of the same type as the first parameter, and
120 * point to an address no lower than the first parameter. Second parameter
121 * must be a power-of-two value.
123 #define RTE_ALIGN_CEIL(ptr, align) \
124 RTE_ALIGN_FLOOR(RTE_PTR_ADD(ptr, align - 1), align)
127 * Macro to align a pointer to a given power-of-two. The resultant
128 * pointer will be a pointer of the same type as the first parameter, and
129 * point to an address no lower than the first parameter. Second parameter
130 * must be a power-of-two value.
131 * This function is the same as RTE_ALIGN_CEIL
133 #define RTE_ALIGN(ptr, align) RTE_ALIGN_CEIL(ptr, align)
136 * Checks if a pointer is aligned to a given power-of-two value
139 * The pointer whose alignment is to be checked
141 * The power-of-two value to which the ptr should be aligned
144 * True(1) where the pointer is correctly aligned, false(0) otherwise
147 rte_is_aligned(void *ptr, unsigned align)
149 return RTE_ALIGN(ptr, align) == ptr;
152 /*********** Macros for compile type checks ********/
155 * Triggers an error at compilation time if the condition is true.
158 #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
160 extern int RTE_BUILD_BUG_ON_detected_error;
161 #define RTE_BUILD_BUG_ON(condition) do { \
162 ((void)sizeof(char[1 - 2*!!(condition)])); \
164 RTE_BUILD_BUG_ON_detected_error = 1; \
168 /*********** Macros to work with powers of 2 ********/
171 * Returns true if n is a power of 2
174 * @return 1 if true, 0 otherwise
177 rte_is_power_of_2(uint32_t n)
179 return ((n-1) & n) == 0;
183 * Aligns input parameter to the next power of 2
186 * The integer value to algin
189 * Input parameter aligned to the next power of 2
191 static inline uint32_t
192 rte_align32pow2(uint32_t x)
204 /*********** Macros for calculating min and max **********/
207 * Macro to return the minimum of two numbers
209 #define RTE_MIN(a, b) ({ \
210 typeof (a) _a = (a); \
211 typeof (b) _b = (b); \
216 * Macro to return the maximum of two numbers
218 #define RTE_MAX(a, b) ({ \
219 typeof (a) _a = (a); \
220 typeof (b) _b = (b); \
224 /*********** Other general functions / macros ********/
227 * PAUSE instruction for tight loops (avoid busy waiting)
232 asm volatile ("pause");
236 /** Return the offset of a field in a structure. */
237 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
240 #define _RTE_STR(x) #x
241 /** Take a macro value and get a string version of it */
242 #define RTE_STR(x) _RTE_STR(x)
245 * Converts a numeric string to the equivalent uint64_t value.
246 * As well as straight number conversion, also recognises the suffixes
247 * k, m and g for kilobytes, megabytes and gigabytes respectively.
249 * If a negative number is passed in i.e. a string with the first non-black
250 * character being "-", zero is returned. Zero is also returned in the case of
251 * an error with the strtoull call in the function.
254 * String containing number to convert.
258 static inline uint64_t
259 rte_str_to_size(const char *str)
262 unsigned long long size;
264 while (isspace((int)*str))
270 size = strtoull(str, &endptr, 0);
275 endptr++; /* allow 1 space gap */
278 case 'G': case 'g': size *= 1024; /* fall-through */
279 case 'M': case 'm': size *= 1024; /* fall-through */
280 case 'K': case 'k': size *= 1024; /* fall-through */
288 * Function to terminate the application immediately, printing an error
289 * message and returning the exit_code back to the shell.
291 * This function never returns
294 * The exit code to be returned by the application
296 * The format string to be used for printing the message. This can include
297 * printf format characters which will be expanded using any further parameters
301 rte_exit(int exit_code, const char *format, ...)
302 __attribute__((noreturn))
303 __attribute__((format(printf, 2, 3)));