/*-
 * Copyright (c) <2010-2020>, Intel Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
/* Created 2010 by Keith Wiles @ intel.com */

#ifndef _PKTGEN_LOG_H_
#define _PKTGEN_LOG_H_

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Log levels. Each log level has an associated pktgen_log_<LEVEL>()
 * function. */
#define LOG_LEVEL_ALL       0
#define LOG_LEVEL_TRACE     1
#define LOG_LEVEL_DEBUG     2
#define LOG_LEVEL_INFO      3
#define LOG_LEVEL_WARNING   4
#define LOG_LEVEL_ERROR     5
#define LOG_LEVEL_PANIC     6
#define LOG_LEVEL_NONE      7

/* Set default minimum message level to log if one isn't provided at compile
 * time. All pktgen_log_<LEVEL>() calls with a log level lower than the one
 * specified below won't even be compiled.
 * More detailed logs have a negative performance impact, which is undesirable
 * in a production build.
 */
#ifndef LOG_LEVEL
#define LOG_LEVEL   LOG_LEVEL_INFO
#endif

/* Conditionally generate code for pktgen_log_<LEVEL>() functions, depending on
 * the minimum requested log level.
 */
#if LOG_LEVEL <= LOG_LEVEL_TRACE
#define pktgen_log_trace(fmt, ...) pktgen_log(LOG_LEVEL_TRACE, \
					      __FILE__,	\
					      __LINE__,	\
					      __func__, \
					      fmt, \
					      ## __VA_ARGS__)
#else
#define pktgen_log_trace(fmt, ...)	/* no-op */
#endif

#if LOG_LEVEL <= LOG_LEVEL_DEBUG
#define pktgen_log_debug(fmt, ...) pktgen_log(LOG_LEVEL_DEBUG, \
					      __FILE__,	\
					      __LINE__,	\
					      __func__, \
					      fmt, \
					      ## __VA_ARGS__)
#else
#define pktgen_log_debug(fmt, ...)	/* no-op */
#endif

#if LOG_LEVEL <= LOG_LEVEL_INFO
#define pktgen_log_info(fmt, ...) pktgen_log(LOG_LEVEL_INFO, \
					     __FILE__, \
					     __LINE__, \
					     __func__, \
					     fmt, \
					     ## __VA_ARGS__)
#else
#define pktgen_log_info(fmt, ...)	/* no-op */
#endif

#if LOG_LEVEL <= LOG_LEVEL_WARNING
#define pktgen_log_warning(fmt, ...) pktgen_log(LOG_LEVEL_WARNING, \
						__FILE__, \
						__LINE__, \
						__func__, \
						fmt, \
						## __VA_ARGS__)
#else
#define pktgen_log_warning(fmt, ...)	/* no-op */
#endif

#if LOG_LEVEL <= LOG_LEVEL_ERROR
#define pktgen_log_error(fmt, ...) pktgen_log(LOG_LEVEL_ERROR, \
					      __FILE__,	\
					      __LINE__,	\
					      __func__, \
					      fmt, \
					      ## __VA_ARGS__)
#else
#define pktgen_log_error(fmt, ...)	/* no-op */
#endif

#if LOG_LEVEL <= LOG_LEVEL_PANIC
#define pktgen_log_panic(fmt, ...) do {					       \
		pktgen_log(LOG_LEVEL_PANIC, __FILE__, __LINE__, __func__,	       \
			   fmt, ## __VA_ARGS__);					   \
		rte_panic(fmt "\n", ## __VA_ARGS__);						\
} while (0)
#else
#define pktgen_log_panic(fmt, ...) rte_panic(fmt, ## __VA_ARGS__)
#endif

/* Helper for building log strings.
 * The macro takes an existing string, a printf-like format string and optional
 * arguments. It formats the string and appends it to the existing string, while
 * avoiding possible buffer overruns.
 */
#define strncatf(dest, fmt, ...) do {					\
		char _buff[1023];					\
		snprintf(_buff, sizeof(_buff), fmt, ## __VA_ARGS__);	\
		strncat(dest, _buff, sizeof(dest) - strlen(dest) - 1);	\
	} while (0)

/* Initialize log data structures */
void pktgen_init_log(void);

/**************************************************************************//**
 *
 * pktgen_log_set_screen_level - Set level of messages that are printed to the screen
 *
 * DESCRIPTION
 * Messages of the specified level or higher are printed to the screen
 * in addition to being logged to the log page and optionally to a file.
 *
 * RETURNS: N/A
 *
 * SEE ALSO:
 */
void pktgen_log_set_screen_level(int level);

/**************************************************************************//**
 *
 * pktgen_log - printf-like function for logging
 *
 * DESCRIPTION
 * Log the provided message to the log page and to a file if enabled.
 *
 * RETURNS: N/A
 *
 * SEE ALSO:
 */
void pktgen_log(int level, const char *file, long line,
		       const char *func, const char *fmt, ...);

/**************************************************************************//**
 *
 * pktgen_log_set_file - Start logging to a file
 *
 * DESCRIPTION
 * Writes the log to the provided filename. If the file already exists, it is
 * truncated.
 *
 * RETURNS: N/A
 *
 * SEE ALSO:
 */
void pktgen_log_set_file(const char *filename);

/**************************************************************************//**
 *
 * pktgen_page_log - Display the log page.
 *
 * DESCRIPTION
 * Display the log page on the screen.
 *
 * RETURNS: N/A
 *
 * SEE ALSO:
 */
void pktgen_page_log(uint32_t print_labels);

#ifdef __cplusplus
}
#endif

#endif  /* _PKTGEN_LOG_H_ */