rte_telemetry.h File Reference

#include <stdint.h>
#include <rte_compat.h>

Go to the source code of this file.

Macros
#define	TELEMETRY_MAX_CALLBACKS   64
#define	RTE_TEL_MAX_STRING_LEN   64
#define	RTE_TEL_MAX_SINGLE_STRING_LEN   8192
#define	RTE_TEL_MAX_DICT_ENTRIES   256
#define	RTE_TEL_MAX_ARRAY_ENTRIES   512

Typedefs
typedef int(*	telemetry_cb) (const char *cmd, const char *params, struct rte_tel_data *info)
typedef void *(*	handler) (void *sock_id)

Enumerations
enum	rte_tel_value_type { , RTE_TEL_INT_VAL, RTE_TEL_U64_VAL }

Functions
__rte_experimental int	rte_tel_data_start_array (struct rte_tel_data *d, enum rte_tel_value_type type)
__rte_experimental int	rte_tel_data_start_dict (struct rte_tel_data *d)
__rte_experimental int	rte_tel_data_string (struct rte_tel_data *d, const char *str)
__rte_experimental int	rte_tel_data_add_array_string (struct rte_tel_data *d, const char *str)
__rte_experimental int	rte_tel_data_add_array_int (struct rte_tel_data *d, int x)
__rte_experimental int	rte_tel_data_add_array_u64 (struct rte_tel_data *d, uint64_t x)
__rte_experimental int	rte_tel_data_add_dict_string (struct rte_tel_data *d, const char *name, const char *val)
__rte_experimental int	rte_tel_data_add_dict_int (struct rte_tel_data *d, const char *name, int val)
__rte_experimental int	rte_tel_data_add_dict_u64 (struct rte_tel_data *d, const char *name, uint64_t val)
__rte_experimental int	rte_telemetry_register_cmd (const char *cmd, telemetry_cb fn, const char *help)

Detailed Description

Warning

EXPERIMENTAL: all functions in this file may change without prior notice

RTE Telemetry

The telemetry library provides a method to retrieve statistics from DPDK by sending a request message over a socket. DPDK will send a JSON encoded response containing telemetry data.

Definition in file rte_telemetry.h.

Macro Definition Documentation

#define TELEMETRY_MAX_CALLBACKS   64

Maximum number of telemetry callbacks.

Definition at line 12 of file rte_telemetry.h.

#define RTE_TEL_MAX_STRING_LEN   64

Maximum length for string used in object.

Definition at line 14 of file rte_telemetry.h.

#define RTE_TEL_MAX_SINGLE_STRING_LEN   8192

Maximum length of string.

Definition at line 16 of file rte_telemetry.h.

#define RTE_TEL_MAX_DICT_ENTRIES   256

Maximum number of dictionary entries.

Definition at line 18 of file rte_telemetry.h.

#define RTE_TEL_MAX_ARRAY_ENTRIES   512

Maximum number of array entries.

Definition at line 20 of file rte_telemetry.h.

Typedef Documentation

typedef int(* telemetry_cb) (const char *cmd, const char *params, struct rte_tel_data *info)

This telemetry callback is used when registering a telemetry command. It handles getting and formatting information to be returned to telemetry when requested.

Parameters

cmd	The cmd that was requested by the client.
params	Contains data required by the callback function.
info	The information to be returned to the caller.

Returns

Length of buffer used on success.

Negative integer on error.

Definition at line 208 of file rte_telemetry.h.

typedef void*(* handler) (void *sock_id)

Used for handling data received over a telemetry socket.

Parameters

sock_id

ID for the socket to be used by the handler.

Returns

Void.

Definition at line 220 of file rte_telemetry.h.

Enumeration Type Documentation

enum rte_tel_value_type

The types of data that can be managed in arrays or dicts. For arrays, this must be specified at creation time, while for dicts this is specified implicitly each time an element is added via calling a type-specific function.

Enumerator
RTE_TEL_INT_VAL	a string value
RTE_TEL_U64_VAL	a signed 32-bit int value

Definition at line 43 of file rte_telemetry.h.

Function Documentation

__rte_experimental int rte_tel_data_start_array	(	struct rte_tel_data *	d,
		enum rte_tel_value_type	type
	)

Start an array of the specified type for returning from a callback

Parameters

d	The data structure passed to the callback
type	The type of the array of data

Returns

0 on success, negative errno on error

__rte_experimental int rte_tel_data_start_dict

(

struct rte_tel_data *

d

)

Start a dictionary of values for returning from a callback

Parameters

d	The data structure passed to the callback

Returns

0 on success, negative errno on error

Examples:

examples/l3fwd-power/main.c.

__rte_experimental int rte_tel_data_string	(	struct rte_tel_data *	d,
		const char *	str
	)

Set a string for returning from a callback

Parameters

d	The data structure passed to the callback
str	The string to be returned in the data structure

Returns

0 on success, negative errno on error, E2BIG on string truncation

__rte_experimental int rte_tel_data_add_array_string	(	struct rte_tel_data *	d,
		const char *	str
	)

Add a string to an array. The array must have been started by rte_tel_data_start_array() with RTE_TEL_STRING_VAL as the type parameter.

Parameters

d	The data structure passed to the callback
str	The string to be returned in the array

Returns

0 on success, negative errno on error, E2BIG on string truncation

__rte_experimental int rte_tel_data_add_array_int	(	struct rte_tel_data *	d,
		int	x
	)

Add an int to an array. The array must have been started by rte_tel_data_start_array() with RTE_TEL_INT_VAL as the type parameter.

Parameters

d	The data structure passed to the callback
x	The number to be returned in the array

Returns

0 on success, negative errno on error

__rte_experimental int rte_tel_data_add_array_u64	(	struct rte_tel_data *	d,
		uint64_t	x
	)

Add a uint64_t to an array. The array must have been started by rte_tel_data_start_array() with RTE_TEL_U64_VAL as the type parameter.

Parameters

d	The data structure passed to the callback
x	The number to be returned in the array

Returns

0 on success, negative errno on error

__rte_experimental int rte_tel_data_add_dict_string	(	struct rte_tel_data *	d,
		const char *	name,
		const char *	val
	)

Add a string value to a dictionary. The dict must have been started by rte_tel_data_start_dict().

Parameters

d	The data structure passed to the callback
name	The name the value is to be stored under in the dict
val	The string to be stored in the dict

Returns

0 on success, negative errno on error, E2BIG on string truncation of either name or value.

__rte_experimental int rte_tel_data_add_dict_int	(	struct rte_tel_data *	d,
		const char *	name,
		int	val
	)

Add an int value to a dictionary. The dict must have been started by rte_tel_data_start_dict().

Parameters

d	The data structure passed to the callback
name	The name the value is to be stored under in the dict
val	The number to be stored in the dict

Returns

0 on success, negative errno on error, E2BIG on string truncation of name.

__rte_experimental int rte_tel_data_add_dict_u64	(	struct rte_tel_data *	d,
		const char *	name,
		uint64_t	val
	)

Add a uint64_t value to a dictionary. The dict must have been started by rte_tel_data_start_dict().

Parameters

d	The data structure passed to the callback
name	The name the value is to be stored under in the dict
val	The number to be stored in the dict

Returns

0 on success, negative errno on error, E2BIG on string truncation of name.

Examples:

examples/l3fwd-power/main.c.

__rte_experimental int rte_telemetry_register_cmd	(	const char *	cmd,
		telemetry_cb	fn,
		const char *	help
	)

Used when registering a command and callback function with telemetry.

Parameters

cmd	The command to register with telemetry.
fn	Callback function to be called when the command is requested.
help	Help text for the command.

Returns

0 on success.

-EINVAL for invalid parameters failure.

-ENOENT if max callbacks limit has been reached.

Examples:

examples/l3fwd-power/main.c.