ceph/src/dpdk/lib/librte_eal/common/include/rte_log.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   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 Intel Corporation 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_LOG_H_
  35 #define _RTE_LOG_H_
  36
  37 /**
  38  * @file
  39  *
  40  * RTE Logs API
  41  *
  42  * This file provides a log API to RTE applications.
  43  */
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 #include <stdint.h>
  50 #include <stdio.h>
  51 #include <stdarg.h>
  52
  53 /** The rte_log structure. */
  54 struct rte_logs {
  55         uint32_t type;  /**< Bitfield with enabled logs. */
  56         uint32_t level; /**< Log level. */
  57         FILE *file;     /**< Output file set by rte_openlog_stream, or NULL. */
  58 };
  59
  60 /** Global log informations */
  61 extern struct rte_logs rte_logs;
  62
  63 /* SDK log type */
  64 #define RTE_LOGTYPE_EAL     0x00000001 /**< Log related to eal. */
  65 #define RTE_LOGTYPE_MALLOC  0x00000002 /**< Log related to malloc. */
  66 #define RTE_LOGTYPE_RING    0x00000004 /**< Log related to ring. */
  67 #define RTE_LOGTYPE_MEMPOOL 0x00000008 /**< Log related to mempool. */
  68 #define RTE_LOGTYPE_TIMER   0x00000010 /**< Log related to timers. */
  69 #define RTE_LOGTYPE_PMD     0x00000020 /**< Log related to poll mode driver. */
  70 #define RTE_LOGTYPE_HASH    0x00000040 /**< Log related to hash table. */
  71 #define RTE_LOGTYPE_LPM     0x00000080 /**< Log related to LPM. */
  72 #define RTE_LOGTYPE_KNI     0x00000100 /**< Log related to KNI. */
  73 #define RTE_LOGTYPE_ACL     0x00000200 /**< Log related to ACL. */
  74 #define RTE_LOGTYPE_POWER   0x00000400 /**< Log related to power. */
  75 #define RTE_LOGTYPE_METER   0x00000800 /**< Log related to QoS meter. */
  76 #define RTE_LOGTYPE_SCHED   0x00001000 /**< Log related to QoS port scheduler. */
  77 #define RTE_LOGTYPE_PORT    0x00002000 /**< Log related to port. */
  78 #define RTE_LOGTYPE_TABLE   0x00004000 /**< Log related to table. */
  79 #define RTE_LOGTYPE_PIPELINE 0x00008000 /**< Log related to pipeline. */
  80 #define RTE_LOGTYPE_MBUF    0x00010000 /**< Log related to mbuf. */
  81 #define RTE_LOGTYPE_CRYPTODEV 0x00020000 /**< Log related to cryptodev. */
  82
  83 /* these log types can be used in an application */
  84 #define RTE_LOGTYPE_USER1   0x01000000 /**< User-defined log type 1. */
  85 #define RTE_LOGTYPE_USER2   0x02000000 /**< User-defined log type 2. */
  86 #define RTE_LOGTYPE_USER3   0x04000000 /**< User-defined log type 3. */
  87 #define RTE_LOGTYPE_USER4   0x08000000 /**< User-defined log type 4. */
  88 #define RTE_LOGTYPE_USER5   0x10000000 /**< User-defined log type 5. */
  89 #define RTE_LOGTYPE_USER6   0x20000000 /**< User-defined log type 6. */
  90 #define RTE_LOGTYPE_USER7   0x40000000 /**< User-defined log type 7. */
  91 #define RTE_LOGTYPE_USER8   0x80000000 /**< User-defined log type 8. */
  92
  93 /* Can't use 0, as it gives compiler warnings */
  94 #define RTE_LOG_EMERG    1U  /**< System is unusable.               */
  95 #define RTE_LOG_ALERT    2U  /**< Action must be taken immediately. */
  96 #define RTE_LOG_CRIT     3U  /**< Critical conditions.              */
  97 #define RTE_LOG_ERR      4U  /**< Error conditions.                 */
  98 #define RTE_LOG_WARNING  5U  /**< Warning conditions.               */
  99 #define RTE_LOG_NOTICE   6U  /**< Normal but significant condition. */
 100 #define RTE_LOG_INFO     7U  /**< Informational.                    */
 101 #define RTE_LOG_DEBUG    8U  /**< Debug-level messages.             */
 102
 103 /**
 104  * Change the stream that will be used by the logging system.
 105  *
 106  * This can be done at any time. The f argument represents the stream
 107  * to be used to send the logs. If f is NULL, the default output is
 108  * used (stderr).
 109  *
 110  * @param f
 111  *   Pointer to the stream.
 112  * @return
 113  *   - 0 on success.
 114  *   - Negative on error.
 115  */
 116 int rte_openlog_stream(FILE *f);
 117
 118 /**
 119  * Set the global log level.
 120  *
 121  * After this call, all logs that are lower or equal than level and
 122  * lower or equal than the RTE_LOG_LEVEL configuration option will be
 123  * displayed.
 124  *
 125  * @param level
 126  *   Log level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
 127  */
 128 void rte_set_log_level(uint32_t level);
 129
 130 /**
 131  * Get the global log level.
 132  */
 133 uint32_t rte_get_log_level(void);
 134
 135 /**
 136  * Enable or disable the log type.
 137  *
 138  * @param type
 139  *   Log type, for example, RTE_LOGTYPE_EAL.
 140  * @param enable
 141  *   True for enable; false for disable.
 142  */
 143 void rte_set_log_type(uint32_t type, int enable);
 144
 145 /**
 146  * Get the global log type.
 147  */
 148 uint32_t rte_get_log_type(void);
 149
 150 /**
 151  * Get the current loglevel for the message being processed.
 152  *
 153  * Before calling the user-defined stream for logging, the log
 154  * subsystem sets a per-lcore variable containing the loglevel and the
 155  * logtype of the message being processed. This information can be
 156  * accessed by the user-defined log output function through this
 157  * function.
 158  *
 159  * @return
 160  *   The loglevel of the message being processed.
 161  */
 162 int rte_log_cur_msg_loglevel(void);
 163
 164 /**
 165  * Get the current logtype for the message being processed.
 166  *
 167  * Before calling the user-defined stream for logging, the log
 168  * subsystem sets a per-lcore variable containing the loglevel and the
 169  * logtype of the message being processed. This information can be
 170  * accessed by the user-defined log output function through this
 171  * function.
 172  *
 173  * @return
 174  *   The logtype of the message being processed.
 175  */
 176 int rte_log_cur_msg_logtype(void);
 177
 178 /**
 179  * Generates a log message.
 180  *
 181  * The message will be sent in the stream defined by the previous call
 182  * to rte_openlog_stream().
 183  *
 184  * The level argument determines if the log should be displayed or
 185  * not, depending on the global rte_logs variable.
 186  *
 187  * The preferred alternative is the RTE_LOG() function because debug logs may
 188  * be removed at compilation time if optimization is enabled. Moreover,
 189  * logs are automatically prefixed by type when using the macro.
 190  *
 191  * @param level
 192  *   Log level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
 193  * @param logtype
 194  *   The log type, for example, RTE_LOGTYPE_EAL.
 195  * @param format
 196  *   The format string, as in printf(3), followed by the variable arguments
 197  *   required by the format.
 198  * @return
 199  *   - 0: Success.
 200  *   - Negative on error.
 201  */
 202 int rte_log(uint32_t level, uint32_t logtype, const char *format, ...)
 203 #ifdef __GNUC__
 204 #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 2))
 205         __attribute__((cold))
 206 #endif
 207 #endif
 208         __attribute__((format(printf, 3, 4)));
 209
 210 /**
 211  * Generates a log message.
 212  *
 213  * The message will be sent in the stream defined by the previous call
 214  * to rte_openlog_stream().
 215  *
 216  * The level argument determines if the log should be displayed or
 217  * not, depending on the global rte_logs variable. A trailing
 218  * newline may be added if needed.
 219  *
 220  * The preferred alternative is the RTE_LOG() because debug logs may be
 221  * removed at compilation time.
 222  *
 223  * @param level
 224  *   Log level. A value between RTE_LOG_EMERG (1) and RTE_LOG_DEBUG (8).
 225  * @param logtype
 226  *   The log type, for example, RTE_LOGTYPE_EAL.
 227  * @param format
 228  *   The format string, as in printf(3), followed by the variable arguments
 229  *   required by the format.
 230  * @param ap
 231  *   The va_list of the variable arguments required by the format.
 232  * @return
 233  *   - 0: Success.
 234  *   - Negative on error.
 235  */
 236 int rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
 237         __attribute__((format(printf,3,0)));
 238
 239 /**
 240  * Generates a log message.
 241  *
 242  * The RTE_LOG() is equivalent to rte_log() with two differences:
 243
 244  * - RTE_LOG() can be used to remove debug logs at compilation time,
 245  *   depending on RTE_LOG_LEVEL configuration option, and compilation
 246  *   optimization level. If optimization is enabled, the tests
 247  *   involving constants only are pre-computed. If compilation is done
 248  *   with -O0, these tests will be done at run time.
 249  * - The log level and log type names are smaller, for example:
 250  *   RTE_LOG(INFO, EAL, "this is a %s", "log");
 251  *
 252  * @param l
 253  *   Log level. A value between EMERG (1) and DEBUG (8). The short name is
 254  *   expanded by the macro, so it cannot be an integer value.
 255  * @param t
 256  *   The log type, for example, EAL. The short name is expanded by the
 257  *   macro, so it cannot be an integer value.
 258  * @param ...
 259  *   The fmt string, as in printf(3), followed by the variable arguments
 260  *   required by the format.
 261  * @return
 262  *   - 0: Success.
 263  *   - Negative on error.
 264  */
 265 #define RTE_LOG(l, t, ...)                                      \
 266         (void)((RTE_LOG_ ## l <= RTE_LOG_LEVEL) ?               \
 267          rte_log(RTE_LOG_ ## l,                                 \
 268                  RTE_LOGTYPE_ ## t, # t ": " __VA_ARGS__) :     \
 269          0)
 270
 271 #ifdef __cplusplus
 272 }
 273 #endif
 274
 275 #endif /* _RTE_LOG_H_ */