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/*
* Debugging utilities.
* Copyright (C) 2018 Cumulus Networks, Inc.
* Quentin Young
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _FRRDEBUG_H
#define _FRRDEBUG_H
#include <zebra.h>
#include "command.h"
#include "frratomic.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* Debugging modes.
*
* FRR's convention is that a debug statement issued under the vty CONFIG_NODE
* persists to the config file, whereas the same debug statement issued from
* the ENABLE_NODE only persists for the current session. These are mapped to
* DEBUG_MODE_CONF and DEBUG_MODE_TERM respectively.
*
* They are not mutually exclusive and are placed in the MSB of the flags
* field in a debugging record.
*/
#define DEBUG_MODE_TERM 0x01000000
#define DEBUG_MODE_CONF 0x02000000
#define DEBUG_MODE_ALL (DEBUG_MODE_TERM | DEBUG_MODE_CONF)
#define DEBUG_MODE_NONE 0x00000000
#define DEBUG_OPT_ALL 0x00FFFFFF
#define DEBUG_OPT_NONE 0x00000000
/*
* Debugging record.
*
* All operations on this record exposed in this header are MT-safe.
*
* flags
* A bitfield with the following format (bytes high to low)
* - [0] Debugging mode field (MSB) | Mode
* - [1] Arbitrary flag field | Option
* - [2] Arbitrary flag field | Option
* - [3] Arbitrary flag field (LSB) | Option
*
* ALL THESE BYTES ARE YOURS - EXCEPT MODE.
* ATTEMPT NO BIT OPS THERE.
*
* The MSB of this field determines the debug mode, Use the DEBUG_MODE*
* macros to manipulate this byte.
*
* The low 3 bytes of this field may be used to store arbitrary information.
* Usually they are used to store flags that tune how detailed the logging
* for a particular debug record is. Use the DEBUG_OPT* macros to manipulate
* those bytes.
*
* All operations performed on this field should be done using the macros
* later in this header file. They are guaranteed to be atomic operations
* with respect to this field. Using anything except the macros to
* manipulate the flags field in a multithreaded environment results in
* undefined behavior.
*
* desc
* Human-readable description of this debugging record.
*/
struct debug {
atomic_uint_fast32_t flags;
const char *desc;
};
PREDECL_LIST(debug_cb_list);
/*
* Callback set for debugging code.
*
* debug_set_all
* Function pointer to call when the user requests that all debugs have a
* mode set.
*/
struct debug_callbacks {
/*
* Linked list of Callbacks to call
*/
struct debug_cb_list_item item;
/*
* flags
* flags to set on debug flag fields
*
* set
* true: set flags
* false: unset flags
*/
void (*debug_set_all)(uint32_t flags, bool set);
};
/*
* Check if a mode is set for a debug.
*
* MT-Safe
*/
#define DEBUG_MODE_CHECK(name, mode) \
CHECK_FLAG_ATOMIC(&(name)->flags, (mode)&DEBUG_MODE_ALL)
/*
* Check if an option bit is set for a debug.
*
* MT-Safe
*/
#define DEBUG_OPT_CHECK(name, opt) \
CHECK_FLAG_ATOMIC(&(name)->flags, (opt)&DEBUG_OPT_ALL)
/*
* Check if bits are set for a debug.
*
* MT-Safe
*/
#define DEBUG_FLAGS_CHECK(name, fl) CHECK_FLAG_ATOMIC(&(name)->flags, (fl))
/*
* Set modes on a debug.
*
* MT-Safe
*/
#define DEBUG_MODE_SET(name, mode, onoff) \
do { \
if (onoff) \
SET_FLAG_ATOMIC(&(name)->flags, \
(mode)&DEBUG_MODE_ALL); \
else \
UNSET_FLAG_ATOMIC(&(name)->flags, \
(mode)&DEBUG_MODE_ALL); \
} while (0)
/* Convenience macros for specific set operations. */
#define DEBUG_MODE_ON(name, mode) DEBUG_MODE_SET(name, mode, true)
#define DEBUG_MODE_OFF(name, mode) DEBUG_MODE_SET(name, mode, false)
/*
* Set options on a debug.
*
* MT-Safe
*/
#define DEBUG_OPT_SET(name, opt, onoff) \
do { \
if (onoff) \
SET_FLAG_ATOMIC(&(name)->flags, (opt)&DEBUG_OPT_ALL); \
else \
UNSET_FLAG_ATOMIC(&(name)->flags, \
(opt)&DEBUG_OPT_ALL); \
} while (0)
/* Convenience macros for specific set operations. */
#define DEBUG_OPT_ON(name, opt) DEBUG_OPT_SET(name, opt, true)
#define DEBUG_OPT_OFF(name, opt) DEBUG_OPT_SET(name, opt, true)
/*
* Set bits on a debug.
*
* MT-Safe
*/
#define DEBUG_FLAGS_SET(name, fl, onoff) \
do { \
if (onoff) \
SET_FLAG_ATOMIC(&(name)->flags, (fl)); \
else \
UNSET_FLAG_ATOMIC(&(name)->flags, (fl)); \
} while (0)
/* Convenience macros for specific set operations. */
#define DEBUG_FLAGS_ON(name, fl) DEBUG_FLAGS_SET(&(name)->flags, (type), true)
#define DEBUG_FLAGS_OFF(name, fl) DEBUG_FLAGS_SET(&(name)->flags, (type), false)
/*
* Unset all modes and options on a debug.
*
* MT-Safe
*/
#define DEBUG_CLEAR(name) RESET_FLAG_ATOMIC(&(name)->flags)
/*
* Set all modes and options on a debug.
*
* MT-Safe
*/
#define DEBUG_ON(name) \
SET_FLAG_ATOMIC(&(name)->flags, DEBUG_MODE_ALL | DEBUG_OPT_ALL)
/*
* Map a vty node to the correct debugging mode flags. FRR behaves such that a
* debug statement issued under the config node persists to the config file,
* whereas the same debug statement issued from the enable node only persists
* for the current session.
*
* MT-Safe
*/
#define DEBUG_NODE2MODE(vtynode) \
(((vtynode) == CONFIG_NODE) ? DEBUG_MODE_ALL : DEBUG_MODE_TERM)
/*
* Debug at the given level to the default logging destination.
*
* MT-Safe
*/
#define DEBUG(level, name, fmt, ...) \
do { \
if (DEBUG_MODE_CHECK(name, DEBUG_MODE_ALL)) \
zlog_##level(fmt, ##__VA_ARGS__); \
} while (0)
/* Convenience macros for the various levels. */
#define DEBUGE(name, fmt, ...) DEBUG(err, name, fmt, ##__VA_ARGS__)
#define DEBUGW(name, fmt, ...) DEBUG(warn, name, fmt, ##__VA_ARGS__)
#define DEBUGI(name, fmt, ...) DEBUG(info, name, fmt, ##__VA_ARGS__)
#define DEBUGN(name, fmt, ...) DEBUG(notice, name, fmt, ##__VA_ARGS__)
#define DEBUGD(name, fmt, ...) DEBUG(debug, name, fmt, ##__VA_ARGS__)
/*
* Optional initializer for debugging. Highly recommended.
*
* This function installs common debugging commands and allows the caller to
* specify callbacks to take when these commands are issued, allowing the
* caller to respond to events such as a request to turn off all debugs.
*
* MT-Safe
*/
void debug_init(struct debug_callbacks *cb);
/*
* Turn on the cli to turn on/off debugs.
* Should only be called by libfrr
*/
void debug_init_cli(void);
#ifdef __cplusplus
}
#endif
#endif /* _FRRDEBUG_H */
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