ceph/src/seastar/dpdk/drivers/net/mlx5/mlx5_utils.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright 2015 6WIND S.A.
   5  *   Copyright 2015 Mellanox.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of 6WIND S.A. nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef RTE_PMD_MLX5_UTILS_H_
  35 #define RTE_PMD_MLX5_UTILS_H_
  36
  37 #include <stddef.h>
  38 #include <stdio.h>
  39 #include <limits.h>
  40 #include <assert.h>
  41 #include <errno.h>
  42
  43 #include "mlx5_defs.h"
  44
  45 /* Bit-field manipulation. */
  46 #define BITFIELD_DECLARE(bf, type, size) \
  47         type bf[(((size_t)(size) / (sizeof(type) * CHAR_BIT)) + \
  48                  !!((size_t)(size) % (sizeof(type) * CHAR_BIT)))]
  49 #define BITFIELD_DEFINE(bf, type, size) \
  50         BITFIELD_DECLARE((bf), type, (size)) = { 0 }
  51 #define BITFIELD_SET(bf, b) \
  52         (assert((size_t)(b) < (sizeof(bf) * CHAR_BIT)), \
  53          (void)((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] |= \
  54                 ((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT)))))
  55 #define BITFIELD_RESET(bf, b) \
  56         (assert((size_t)(b) < (sizeof(bf) * CHAR_BIT)), \
  57          (void)((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] &= \
  58                 ~((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT)))))
  59 #define BITFIELD_ISSET(bf, b) \
  60         (assert((size_t)(b) < (sizeof(bf) * CHAR_BIT)), \
  61          !!(((bf)[((b) / (sizeof((bf)[0]) * CHAR_BIT))] & \
  62              ((size_t)1 << ((b) % (sizeof((bf)[0]) * CHAR_BIT))))))
  63
  64 /* Save and restore errno around argument evaluation. */
  65 #define ERRNO_SAFE(x) ((errno = (int []){ errno, ((x), 0) }[0]))
  66
  67 /*
  68  * Helper macros to work around __VA_ARGS__ limitations in a C99 compliant
  69  * manner.
  70  */
  71 #define PMD_DRV_LOG_STRIP(a, b) a
  72 #define PMD_DRV_LOG_OPAREN (
  73 #define PMD_DRV_LOG_CPAREN )
  74 #define PMD_DRV_LOG_COMMA ,
  75
  76 /* Return the file name part of a path. */
  77 static inline const char *
  78 pmd_drv_log_basename(const char *s)
  79 {
  80         const char *n = s;
  81
  82         while (*n)
  83                 if (*(n++) == '/')
  84                         s = n;
  85         return s;
  86 }
  87
  88 /*
  89  * When debugging is enabled (NDEBUG not defined), file, line and function
  90  * information replace the driver name (MLX5_DRIVER_NAME) in log messages.
  91  */
  92 #ifndef NDEBUG
  93
  94 #define PMD_DRV_LOG___(level, ...) \
  95         ERRNO_SAFE(RTE_LOG(level, PMD, __VA_ARGS__))
  96 #define PMD_DRV_LOG__(level, ...) \
  97         PMD_DRV_LOG___(level, "%s:%u: %s(): " __VA_ARGS__)
  98 #define PMD_DRV_LOG_(level, s, ...) \
  99         PMD_DRV_LOG__(level, \
 100                 s "\n" PMD_DRV_LOG_COMMA \
 101                 pmd_drv_log_basename(__FILE__) PMD_DRV_LOG_COMMA \
 102                 __LINE__ PMD_DRV_LOG_COMMA \
 103                 __func__, \
 104                 __VA_ARGS__)
 105
 106 #else /* NDEBUG */
 107
 108 #define PMD_DRV_LOG___(level, ...) \
 109         ERRNO_SAFE(RTE_LOG(level, PMD, MLX5_DRIVER_NAME ": " __VA_ARGS__))
 110 #define PMD_DRV_LOG__(level, ...) \
 111         PMD_DRV_LOG___(level, __VA_ARGS__)
 112 #define PMD_DRV_LOG_(level, s, ...) \
 113         PMD_DRV_LOG__(level, s "\n", __VA_ARGS__)
 114
 115 #endif /* NDEBUG */
 116
 117 /* Generic printf()-like logging macro with automatic line feed. */
 118 #define PMD_DRV_LOG(level, ...) \
 119         PMD_DRV_LOG_(level, \
 120                 __VA_ARGS__ PMD_DRV_LOG_STRIP PMD_DRV_LOG_OPAREN, \
 121                 PMD_DRV_LOG_CPAREN)
 122
 123 /*
 124  * Like assert(), DEBUG() becomes a no-op and claim_zero() does not perform
 125  * any check when debugging is disabled.
 126  */
 127 #ifndef NDEBUG
 128
 129 #define DEBUG(...) PMD_DRV_LOG(DEBUG, __VA_ARGS__)
 130 #define claim_zero(...) assert((__VA_ARGS__) == 0)
 131
 132 #else /* NDEBUG */
 133
 134 #define DEBUG(...) (void)0
 135 #define claim_zero(...) (__VA_ARGS__)
 136
 137 #endif /* NDEBUG */
 138
 139 #define INFO(...) PMD_DRV_LOG(INFO, __VA_ARGS__)
 140 #define WARN(...) PMD_DRV_LOG(WARNING, __VA_ARGS__)
 141 #define ERROR(...) PMD_DRV_LOG(ERR, __VA_ARGS__)
 142
 143 /* Convenience macros for accessing mbuf fields. */
 144 #define NEXT(m) ((m)->next)
 145 #define DATA_LEN(m) ((m)->data_len)
 146 #define PKT_LEN(m) ((m)->pkt_len)
 147 #define DATA_OFF(m) ((m)->data_off)
 148 #define SET_DATA_OFF(m, o) ((m)->data_off = (o))
 149 #define NB_SEGS(m) ((m)->nb_segs)
 150 #define PORT(m) ((m)->port)
 151
 152 /* Transpose flags. Useful to convert IBV to DPDK flags. */
 153 #define TRANSPOSE(val, from, to) \
 154         (((from) >= (to)) ? \
 155          (((val) & (from)) / ((from) / (to))) : \
 156          (((val) & (from)) * ((to) / (from))))
 157
 158 /* Allocate a buffer on the stack and fill it with a printf format string. */
 159 #define MKSTR(name, ...) \
 160         char name[snprintf(NULL, 0, __VA_ARGS__) + 1]; \
 161         \
 162         snprintf(name, sizeof(name), __VA_ARGS__)
 163
 164 /**
 165  * Return nearest power of two above input value.
 166  *
 167  * @param v
 168  *   Input value.
 169  *
 170  * @return
 171  *   Nearest power of two above input value.
 172  */
 173 static inline unsigned int
 174 log2above(unsigned int v)
 175 {
 176         unsigned int l;
 177         unsigned int r;
 178
 179         for (l = 0, r = 0; (v >> 1); ++l, v >>= 1)
 180                 r |= (v & 1);
 181         return l + r;
 182 }
 183
 184 #endif /* RTE_PMD_MLX5_UTILS_H_ */