Include dependency graph for fib_walk.c:

Data Structures
struct	fib_walk_t_
	A representation of a graph walk from a parent object to its children. More...

struct	fib_walk_queue_t_
	A represenation of one queue of walk. More...

struct	fib_walk_queues_t_
	A set of priority queues for outstanding walks. More...

struct	fib_walk_history_t_

Macros
#define	FIB_WALK_QUEUE_STATS_NUM ((fib_walk_queue_stats_t)(FIB_WALK_COMPLETED+1))

#define	FIB_WALK_QUEUE_STATS

#define	FOR_EACH_FIB_WALK_QUEUE_STATS(_wqs)

#define	HISTOGRAM_VISITS_PER_WALK_MAX (1<<23)
	Histogram stats on the lenths of each walk in elemenets visisted. More...

#define	HISTOGRAM_VISITS_PER_WALK_INCR (1<<10)

#define	HISTOGRAM_VISITS_PER_WALK_N_BUCKETS (HISTOGRAM_VISITS_PER_WALK_MAX/HISTOGRAM_VISITS_PER_WALK_INCR)

#define	HISTORY_N_WALKS 128
	History of state for the last 128 walks. More...

#define	MAX_HISTORY_REASONS 16

#define	FIB_WALK_DBG(_walk, _fmt, _args...)

#define	FIB_WALK_N_SLEEP (FIB_WALK_LONG_SLEEP+1)

#define	N_TIME_BUCKETS 128
	Histogram on the amount of work done (in msecs) in each walk. More...

#define	TIME_INCREMENTS (N_TIME_BUCKETS/2)

#define	N_ELTS_BUCKETS 128
	Histogram on the number of nodes visted in each quota. More...

#define	USEC 1000000

Typedefs
typedef enum fib_walk_flags_t_	fib_walk_flags_t
	The flags on a walk. More...

typedef struct fib_walk_t_	fib_walk_t
	A representation of a graph walk from a parent object to its children. More...

typedef enum fib_walk_queue_stats_t_	fib_walk_queue_stats_t
	Statistics maintained per-walk queue. More...

typedef struct fib_walk_queue_t_	fib_walk_queue_t
	A represenation of one queue of walk. More...

typedef struct fib_walk_queues_t_	fib_walk_queues_t
	A set of priority queues for outstanding walks. More...

typedef struct fib_walk_history_t_	fib_walk_history_t

typedef enum fib_walk_advance_rc_t_	fib_walk_advance_rc_t
	return code when advancing a walk More...

typedef enum fib_walk_sleep_type_t_	fib_walk_sleep_type_t
	Enurmerate the times of sleep between walks More...

typedef enum fib_walk_process_event_t_	fib_walk_process_event
	Events sent to the FIB walk process. More...

Enumerations
enum	fib_walk_flags_t_ { FIB_WALK_FLAG_SYNC = (1 << 0), FIB_WALK_FLAG_ASYNC = (1 << 1), FIB_WALK_FLAG_EXECUTING = (1 << 2) }
	The flags on a walk. More...

enum	fib_walk_queue_stats_t_ { FIB_WALK_SCHEDULED, FIB_WALK_COMPLETED }
	Statistics maintained per-walk queue. More...

enum	fib_walk_advance_rc_t_ { FIB_WALK_ADVANCE_DONE, FIB_WALK_ADVANCE_MORE, FIB_WALK_ADVANCE_MERGE }
	return code when advancing a walk More...

enum	fib_walk_sleep_type_t_ { FIB_WALK_SHORT_SLEEP, FIB_WALK_LONG_SLEEP }
	Enurmerate the times of sleep between walks More...

enum	fib_walk_process_event_t_ { FIB_WALK_PROCESS_EVENT_DATA, FIB_WALK_PROCESS_EVENT_ENABLE, FIB_WALK_PROCESS_EVENT_DISABLE }
	Events sent to the FIB walk process. More...

Functions
static u8 *	format_fib_walk (u8 s, va_list ap)

u8 *	format_fib_walk_priority (u8 s, va_list ap)

static u8 *	format_fib_walk_queue_stats (u8 s, va_list ap)

static index_t	fib_walk_get_index (fib_walk_t *fwalk)

static fib_walk_t *	fib_walk_get (index_t fwi)

u32	fib_walk_queue_get_size (fib_walk_priority_t prio)

static fib_node_index_t	fib_walk_queue_get_front (fib_walk_priority_t prio)

static void	fib_walk_destroy (index_t fwi)

static fib_walk_advance_rc_t	fib_walk_advance (fib_node_index_t fwi)
	Advance the walk one element in its work list. More...

f64	fib_walk_process_queues (vlib_main_t *vm, const f64 quota)
	Service the queues This is not declared static so that it can be unit tested - i know i know... More...

static uword	fib_walk_process (vlib_main_t vm, vlib_node_runtime_t node, vlib_frame_t *f)
	The 'fib-walk' process's main loop. More...

static fib_walk_t *	fib_walk_alloc (fib_node_type_t parent_type, fib_node_index_t parent_index, fib_walk_flags_t flags, fib_node_back_walk_ctx_t *ctx)
	Allocate a new walk object. More...

static index_t	fib_walk_prio_queue_enquue (fib_walk_priority_t prio, fib_walk_t *fwalk)
	Enqueue a walk onto the appropriate priority queue. More...

void	fib_walk_async (fib_node_type_t parent_type, fib_node_index_t parent_index, fib_walk_priority_t prio, fib_node_back_walk_ctx_t *ctx)

void	fib_walk_sync (fib_node_type_t parent_type, fib_node_index_t parent_index, fib_node_back_walk_ctx_t *ctx)
	Back walk all the children of a FIB node. More...

static fib_node_t *	fib_walk_get_node (fib_node_index_t index)

static void	fib_walk_last_lock_gone (fib_node_t *node)
	Walk objects are not parents, nor are they locked. More...

static fib_walk_t *	fib_walk_get_from_node (fib_node_t *node)

static fib_node_back_walk_rc_t	fib_walk_back_walk_notify (fib_node_t node, fib_node_back_walk_ctx_t ctx)
	Another back walk has reach this walk. More...

void	fib_walk_module_init (void)

u8 *	format_fib_node_bw_reason (u8 s, va_list args)

static clib_error_t *	fib_walk_show (vlib_main_t vm, unformat_input_t input, vlib_cli_command_t *cmd)

static clib_error_t *	fib_walk_set_quota (vlib_main_t vm, unformat_input_t input, vlib_cli_command_t *cmd)

static clib_error_t *	fib_walk_set_histogram_elements_size (vlib_main_t vm, unformat_input_t input, vlib_cli_command_t *cmd)

static clib_error_t *	fib_walk_clear (vlib_main_t vm, unformat_input_t input, vlib_cli_command_t *cmd)

void	fib_walk_process_enable (void)

void	fib_walk_process_disable (void)

static clib_error_t *	fib_walk_process_enable_disable (vlib_main_t vm, unformat_input_t input, vlib_cli_command_t *cmd)

Variables
vlib_log_class_t	fib_walk_logger

static fib_walk_t *	fib_walk_pool
	The pool of all walk objects. More...

static const char *const	fib_walk_queue_stats_names [] = FIB_WALK_QUEUE_STATS
	The names of the walk stats. More...

static const char *const	fib_node_bw_reason_names [] = FIB_NODE_BW_REASONS
	The names of the walk reasons. More...

static fib_walk_queues_t	fib_walk_queues
	The global queues of outstanding walks. More...

static const char *const	fib_walk_priority_names [] = FIB_WALK_PRIORITIES
	The names of the walk priorities. More...

static u64	fib_walk_hist_vists_per_walk [HISTOGRAM_VISITS_PER_WALK_N_BUCKETS]

static u32	history_last_walk_pos

static fib_walk_history_t	fib_walk_history [HISTORY_N_WALKS]

static f64	fib_walk_sleep_duration []
	Durations for the sleep types. More...

static f64	quota = 1e-4
	The time quota for a walk. More...

static u64	fib_walk_work_time_taken [N_TIME_BUCKETS]

static u32	fib_walk_work_nodes_visisted_incr = 2

static u64	fib_walk_work_nodes_visited [N_ELTS_BUCKETS]

static u64	fib_walk_sleep_lengths [2]
	Histogram of the sleep lengths. More...

static vlib_node_registration_t	fib_walk_process_node
	(constructor) VLIB_REGISTER_NODE (fib_walk_process_node) More...

static const fib_node_vft_t	fib_walk_vft
	The FIB walk's graph node virtual function table. More...

static vlib_cli_command_t	fib_walk_show_command
	(constructor) VLIB_CLI_COMMAND (fib_walk_show_command) More...

static vlib_cli_command_t	fib_walk_set_quota_command
	(constructor) VLIB_CLI_COMMAND (fib_walk_set_quota_command) More...

static vlib_cli_command_t	fib_walk_set_histogram_elements_size_command
	(constructor) VLIB_CLI_COMMAND (fib_walk_set_histogram_elements_size_command) More...

static vlib_cli_command_t	fib_walk_clear_command
	(constructor) VLIB_CLI_COMMAND (fib_walk_clear_command) More...

static vlib_cli_command_t	fib_walk_process_command
	(constructor) VLIB_CLI_COMMAND (fib_walk_process_command) More...

Macro Definition Documentation

#define FIB_WALK_DBG	(	_walk,
		_fmt,
		_args...
	)

Value:

{                                                               \
    vlib_log_debug(fib_walk_logger,                             \
                   "[%U]:" _fmt,                                \
                   format_fib_walk(),                             \
                   fib_walk_get_index(_walk),                   \
                   ##_args);                                    \
}

Definition at line 191 of file fib_walk.c.

#define FIB_WALK_N_SLEEP (FIB_WALK_LONG_SLEEP+1)

Definition at line 411 of file fib_walk.c.

#define FIB_WALK_QUEUE_STATS

Value:

{           \
    [FIB_WALK_SCHEDULED] = "scheduled",  \
    [FIB_WALK_COMPLETED] = "completed",  \
}

Definition at line 110 of file fib_walk.c.

#define FIB_WALK_QUEUE_STATS_NUM ((fib_walk_queue_stats_t)(FIB_WALK_COMPLETED+1))

Definition at line 108 of file fib_walk.c.

#define FOR_EACH_FIB_WALK_QUEUE_STATS ( _wqs )

Value:

for ((_wqs) = FIB_WALK_SCHEDULED;         \
         (_wqs) < FIB_WALK_QUEUE_STATS_NUM;   \
         (_wqs)++)

Definition at line 115 of file fib_walk.c.

#define HISTOGRAM_VISITS_PER_WALK_INCR (1<<10)

Definition at line 168 of file fib_walk.c.

#define HISTOGRAM_VISITS_PER_WALK_MAX (1<<23)

Histogram stats on the lenths of each walk in elemenets visisted.

Store upto 1<<23 elements in increments of 1<<10

Definition at line 167 of file fib_walk.c.

#define HISTOGRAM_VISITS_PER_WALK_N_BUCKETS (HISTOGRAM_VISITS_PER_WALK_MAX/HISTOGRAM_VISITS_PER_WALK_INCR)

Definition at line 169 of file fib_walk.c.

#define HISTORY_N_WALKS 128

History of state for the last 128 walks.

Definition at line 176 of file fib_walk.c.

#define MAX_HISTORY_REASONS 16

Definition at line 177 of file fib_walk.c.

#define N_ELTS_BUCKETS 128

Histogram on the number of nodes visted in each quota.

Definition at line 447 of file fib_walk.c.

#define N_TIME_BUCKETS 128

Histogram on the amount of work done (in msecs) in each walk.

Definition at line 440 of file fib_walk.c.

#define TIME_INCREMENTS (N_TIME_BUCKETS/2)

Definition at line 441 of file fib_walk.c.

#define USEC 1000000

Typedef Documentation

typedef enum fib_walk_advance_rc_t_ fib_walk_advance_rc_t

return code when advancing a walk

typedef enum fib_walk_flags_t_ fib_walk_flags_t

The flags on a walk.

typedef struct fib_walk_history_t_ fib_walk_history_t

typedef enum fib_walk_process_event_t_ fib_walk_process_event

Events sent to the FIB walk process.

typedef enum fib_walk_queue_stats_t_ fib_walk_queue_stats_t

Statistics maintained per-walk queue.

typedef struct fib_walk_queue_t_ fib_walk_queue_t

A represenation of one queue of walk.

typedef struct fib_walk_queues_t_ fib_walk_queues_t

A set of priority queues for outstanding walks.

typedef enum fib_walk_sleep_type_t_ fib_walk_sleep_type_t

Enurmerate the times of sleep between walks

typedef struct fib_walk_t_ fib_walk_t

A representation of a graph walk from a parent object to its children.

Enumeration Type Documentation

enum fib_walk_advance_rc_t_

return code when advancing a walk

Enumerator
FIB_WALK_ADVANCE_DONE	The walk is complete.
FIB_WALK_ADVANCE_MORE	the walk has more work
FIB_WALK_ADVANCE_MERGE	The walk merged with the one in front.

Definition at line 316 of file fib_walk.c.

enum fib_walk_flags_t_

The flags on a walk.

Enumerator

FIB_WALK_FLAG_SYNC

A synchronous walk.

This walk will run to completion, i.e. visit ALL the children. It is a depth first traversal of the graph.

FIB_WALK_FLAG_ASYNC

An asynchronous walk.

This walk will be scheduled to run in the background. It will thus visits the children at a later point in time. It is a depth first traversal of the graph.

FIB_WALK_FLAG_EXECUTING

An indication that the walk is currently executing.

Definition at line 24 of file fib_walk.c.

enum fib_walk_process_event_t_

Events sent to the FIB walk process.

Enumerator
FIB_WALK_PROCESS_EVENT_DATA
FIB_WALK_PROCESS_EVENT_ENABLE
FIB_WALK_PROCESS_EVENT_DISABLE

Definition at line 549 of file fib_walk.c.

enum fib_walk_queue_stats_t_

Statistics maintained per-walk queue.

Enumerator
FIB_WALK_SCHEDULED
FIB_WALK_COMPLETED

Definition at line 103 of file fib_walk.c.

enum fib_walk_sleep_type_t_

Enurmerate the times of sleep between walks

Enumerator
FIB_WALK_SHORT_SLEEP
FIB_WALK_LONG_SLEEP

Definition at line 405 of file fib_walk.c.

Function Documentation

static fib_walk_advance_rc_t fib_walk_advance ( fib_node_index_t fwi )

static

Advance the walk one element in its work list.

Definition at line 336 of file fib_walk.c.

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static fib_walk_t* fib_walk_alloc	(	fib_node_type_t	parent_type,
		fib_node_index_t	parent_index,
		fib_walk_flags_t	flags,
		fib_node_back_walk_ctx_t *	ctx
	)

static

Allocate a new walk object.

Definition at line 626 of file fib_walk.c.

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void fib_walk_async	(	fib_node_type_t	parent_type,
		fib_node_index_t	parent_index,
		fib_walk_priority_t	prio,
		fib_node_back_walk_ctx_t *	ctx
	)

Definition at line 688 of file fib_walk.c.

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static fib_node_back_walk_rc_t fib_walk_back_walk_notify	(	fib_node_t *	node,
		fib_node_back_walk_ctx_t *	ctx
	)

static

Another back walk has reach this walk.

Megre them so there is only one left. It is this node being visited that will remain, so copy or merge the context onto it.

Definition at line 894 of file fib_walk.c.

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static clib_error_t* fib_walk_clear	(	vlib_main_t *	vm,
		unformat_input_t *	input,
		vlib_cli_command_t *	cmd
	)

static

Definition at line 1182 of file fib_walk.c.

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static void fib_walk_destroy ( index_t fwi )

static

Definition at line 251 of file fib_walk.c.

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static fib_walk_t* fib_walk_get ( index_t fwi )

static

Definition at line 226 of file fib_walk.c.

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static fib_walk_t* fib_walk_get_from_node ( fib_node_t * node )

static

Definition at line 882 of file fib_walk.c.

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static index_t fib_walk_get_index ( fib_walk_t * fwalk )

static

Definition at line 220 of file fib_walk.c.

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static fib_node_t* fib_walk_get_node ( fib_node_index_t index )

static

Definition at line 862 of file fib_walk.c.

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static void fib_walk_last_lock_gone ( fib_node_t * node )

static

Walk objects are not parents, nor are they locked.

are no-ops

Definition at line 876 of file fib_walk.c.

void fib_walk_module_init ( void )

Definition at line 944 of file fib_walk.c.

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static index_t fib_walk_prio_queue_enquue	(	fib_walk_priority_t	prio,
		fib_walk_t *	fwalk
	)

static

Enqueue a walk onto the appropriate priority queue.

Then signal the background process there is work to do.

Definition at line 663 of file fib_walk.c.

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static uword fib_walk_process	(	vlib_main_t *	vm,
		vlib_node_runtime_t *	node,
		vlib_frame_t *	f
	)

static

The 'fib-walk' process's main loop.

Definition at line 560 of file fib_walk.c.

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void fib_walk_process_disable ( void )

Definition at line 1211 of file fib_walk.c.

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void fib_walk_process_enable ( void )

Definition at line 1202 of file fib_walk.c.

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static clib_error_t* fib_walk_process_enable_disable	(	vlib_main_t *	vm,
		unformat_input_t *	input,
		vlib_cli_command_t *	cmd
	)

static

Definition at line 1220 of file fib_walk.c.

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f64 fib_walk_process_queues	(	vlib_main_t *	vm,
		const f64	quota
	)

Service the queues This is not declared static so that it can be unit tested - i know i know...

Definition at line 461 of file fib_walk.c.

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static fib_node_index_t fib_walk_queue_get_front ( fib_walk_priority_t prio )

static

Definition at line 241 of file fib_walk.c.

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u32 fib_walk_queue_get_size ( fib_walk_priority_t prio )

Definition at line 235 of file fib_walk.c.

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static clib_error_t* fib_walk_set_histogram_elements_size	(	vlib_main_t *	vm,
		unformat_input_t *	input,
		vlib_cli_command_t *	cmd
	)

static

Definition at line 1156 of file fib_walk.c.

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static clib_error_t* fib_walk_set_quota	(	vlib_main_t *	vm,
		unformat_input_t *	input,
		vlib_cli_command_t *	cmd
	)

static

Definition at line 1130 of file fib_walk.c.

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static clib_error_t* fib_walk_show	(	vlib_main_t *	vm,
		unformat_input_t *	input,
		vlib_cli_command_t *	cmd
	)

static

Definition at line 987 of file fib_walk.c.

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void fib_walk_sync	(	fib_node_type_t	parent_type,
		fib_node_index_t	parent_index,
		fib_node_back_walk_ctx_t *	ctx
	)

Back walk all the children of a FIB node.

note this is a synchronous depth first walk. Children visited may propagate the walk to thier children. Other children node types may not propagate, synchronously but instead queue the walk for later async completion.

Definition at line 745 of file fib_walk.c.

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u8* format_fib_node_bw_reason	(	u8 *	s,
		va_list *	args
	)

Definition at line 973 of file fib_walk.c.

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static u8 * format_fib_walk	(	u8 *	s,
		va_list *	ap
	)

static

Definition at line 958 of file fib_walk.c.

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u8* format_fib_walk_priority	(	u8 *	s,
		va_list *	ap
	)

Definition at line 201 of file fib_walk.c.

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static u8* format_fib_walk_queue_stats	(	u8 *	s,
		va_list *	ap
	)

static

Definition at line 210 of file fib_walk.c.

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Variable Documentation

const char* const fib_node_bw_reason_names[] = FIB_NODE_BW_REASONS

static

The names of the walk reasons.

Definition at line 127 of file fib_walk.c.

vlib_cli_command_t fib_walk_clear_command

static

Initial value:

= {
    .path = "clear fib walk",
    .short_help = "clear fib walk",
    .function = fib_walk_clear,
}

(constructor) VLIB_CLI_COMMAND (fib_walk_clear_command)

Definition at line 1195 of file fib_walk.c.

u64 fib_walk_hist_vists_per_walk[HISTOGRAM_VISITS_PER_WALK_N_BUCKETS]

static

Definition at line 171 of file fib_walk.c.

fib_walk_history_t fib_walk_history[HISTORY_N_WALKS]

static

Definition at line 187 of file fib_walk.c.

vlib_log_class_t fib_walk_logger

Definition at line 19 of file fib_walk.c.

fib_walk_t* fib_walk_pool

static

The pool of all walk objects.

Definition at line 98 of file fib_walk.c.

const char* const fib_walk_priority_names[] = FIB_WALK_PRIORITIES

static

The names of the walk priorities.

Definition at line 161 of file fib_walk.c.

vlib_cli_command_t fib_walk_process_command

static

Initial value:

= {
    .path = "test fib-walk-process",
    .short_help = "test fib-walk-process [enable|disable]",
    .function = fib_walk_process_enable_disable,
}

(constructor) VLIB_CLI_COMMAND (fib_walk_process_command)

Definition at line 1239 of file fib_walk.c.

vlib_node_registration_t fib_walk_process_node

static

Initial value:

= {
    .function = fib_walk_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "fib-walk",
}

(constructor) VLIB_REGISTER_NODE (fib_walk_process_node)

Definition at line 615 of file fib_walk.c.

const char* const fib_walk_queue_stats_names[] = FIB_WALK_QUEUE_STATS

static

The names of the walk stats.

Definition at line 123 of file fib_walk.c.

fib_walk_queues_t fib_walk_queues

static

The global queues of outstanding walks.

Definition at line 156 of file fib_walk.c.

vlib_cli_command_t fib_walk_set_histogram_elements_size_command

static

Initial value:

= {
    .path = "set fib walk histogram elements size",
    .short_help = "set fib walk histogram elements size",
    .function = fib_walk_set_histogram_elements_size,
}

(constructor) VLIB_CLI_COMMAND (fib_walk_set_histogram_elements_size_command)

Definition at line 1175 of file fib_walk.c.

vlib_cli_command_t fib_walk_set_quota_command

static

Initial value:

= {
    .path = "set fib walk quota",
    .short_help = "set fib walk quota",
    .function = fib_walk_set_quota,
}

(constructor) VLIB_CLI_COMMAND (fib_walk_set_quota_command)

Definition at line 1149 of file fib_walk.c.

vlib_cli_command_t fib_walk_show_command

static

Initial value:

= {
    .path = "show fib walk",
    .short_help = "show fib walk",
    .function = fib_walk_show,
}

(constructor) VLIB_CLI_COMMAND (fib_walk_show_command)

Definition at line 1123 of file fib_walk.c.

f64 fib_walk_sleep_duration[]

static

Initial value:

= {
    
    [FIB_WALK_LONG_SLEEP] = 2,
    
    [FIB_WALK_SHORT_SLEEP] = 1e-8,
}

Durations for the sleep types.

Definition at line 416 of file fib_walk.c.

u64 fib_walk_sleep_lengths[2]

static

Histogram of the sleep lengths.

Definition at line 454 of file fib_walk.c.

const fib_node_vft_t fib_walk_vft

static

Initial value:

= {
    .fnv_get = fib_walk_get_node,
    .fnv_last_lock = fib_walk_last_lock_gone,
    .fnv_back_walk = fib_walk_back_walk_notify,
}

The FIB walk's graph node virtual function table.

Definition at line 937 of file fib_walk.c.

u32 fib_walk_work_nodes_visisted_incr = 2

static

Definition at line 448 of file fib_walk.c.

u64 fib_walk_work_nodes_visited[N_ELTS_BUCKETS]

static

Definition at line 449 of file fib_walk.c.

u64 fib_walk_work_time_taken[N_TIME_BUCKETS]

static

Definition at line 442 of file fib_walk.c.

u32 history_last_walk_pos

static

Definition at line 178 of file fib_walk.c.

f64 quota = 1e-4

static

The time quota for a walk.

When more than this amount of time is spent, the walk process will yield.

Definition at line 435 of file fib_walk.c.

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