Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 254 insertions, 0 deletions

diff --git a/lib/debug.h b/lib/debug.h
new file mode 100644
index 0000000..a72657b
--- /dev/null
+++ b/lib/debug.h
@@ -0,0 +1,254 @@
+/*
+ * 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 */