*/
#include <stdint.h>
+#include <rte_compat.h>
#ifndef _RTE_TELEMETRY_H_
#define _RTE_TELEMETRY_H_
+/** Maximum number of telemetry callbacks. */
+#define TELEMETRY_MAX_CALLBACKS 64
+/** Maximum length for string used in object. */
+#define RTE_TEL_MAX_STRING_LEN 64
+/** Maximum length of string. */
+#define RTE_TEL_MAX_SINGLE_STRING_LEN 8192
+/** Maximum number of dictionary entries. */
+#define RTE_TEL_MAX_DICT_ENTRIES 256
+/** Maximum number of array entries. */
+#define RTE_TEL_MAX_ARRAY_ENTRIES 512
+
/**
+ * @warning
+ * @b EXPERIMENTAL: all functions in this file may change without prior notice
+ *
* @file
* RTE Telemetry
*
* The telemetry library provides a method to retrieve statistics from
- * DPDK by sending a JSON encoded message over a socket. DPDK will send
+ * DPDK by sending a request message over a socket. DPDK will send
* a JSON encoded response containing telemetry data.
***/
+/** opaque structure used internally for managing data from callbacks */
+struct rte_tel_data;
+
/**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
+ * 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.
+ */
+enum rte_tel_value_type {
+ RTE_TEL_STRING_VAL, /** a string value */
+ RTE_TEL_INT_VAL, /** a signed 32-bit int value */
+ RTE_TEL_U64_VAL, /** an unsigned 64-bit int value */
+};
+
+/**
+ * Start an array of the specified type for returning from a callback
*
- * Initialize Telemetry
+ * @param d
+ * The data structure passed to the callback
+ * @param type
+ * The type of the array of data
+ * @return
+ * 0 on success, negative errno on error
+ */
+__rte_experimental
+int
+rte_tel_data_start_array(struct rte_tel_data *d, enum rte_tel_value_type type);
+
+/**
+ * Start a dictionary of values for returning from a callback
*
+ * @param d
+ * The data structure passed to the callback
* @return
- * 0 on successful initialisation.
+ * 0 on success, negative errno on error
+ */
+__rte_experimental
+int
+rte_tel_data_start_dict(struct rte_tel_data *d);
+
+/**
+ * Set a string for returning from a callback
+ *
+ * @param d
+ * The data structure passed to the callback
+ * @param str
+ * The string to be returned in the data structure
* @return
- * -ENOMEM on memory allocation error
+ * 0 on success, negative errno on error, E2BIG on string truncation
+ */
+__rte_experimental
+int
+rte_tel_data_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.
+ *
+ * @param d
+ * The data structure passed to the callback
+ * @param str
+ * The string to be returned in the array
* @return
- * -EPERM on unknown error failure
+ * 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 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.
+ *
+ * @param d
+ * The data structure passed to the callback
+ * @param x
+ * The number to be returned in the array
* @return
- * -EALREADY if Telemetry is already initialised.
+ * 0 on success, negative errno on error
*/
-int32_t __rte_experimental
-rte_telemetry_init(void);
+__rte_experimental
+int
+rte_tel_data_add_array_int(struct rte_tel_data *d, int x);
/**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
+ * 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.
+ *
+ * @param d
+ * The data structure passed to the callback
+ * @param x
+ * The number to be returned in the array
+ * @return
+ * 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 string value to a dictionary.
+ * The dict must have been started by rte_tel_data_start_dict().
*
- * Clean up and free memory.
+ * @param d
+ * The data structure passed to the callback
+ * @param name
+ * The name the value is to be stored under in the dict
+ * @param val
+ * The string to be stored in the dict
+ * @return
+ * 0 on success, negative errno on error, E2BIG on string truncation of
+ * either name or value.
+ */
+__rte_experimental
+int
+rte_tel_data_add_dict_string(struct rte_tel_data *d, const char *name,
+ const char *val);
+
+/**
+ * Add an int value to a dictionary.
+ * The dict must have been started by rte_tel_data_start_dict().
*
+ * @param d
+ * The data structure passed to the callback
+ * @param name
+ * The name the value is to be stored under in the dict
+ * @param val
+ * The number to be stored in the dict
* @return
- * 0 on success
+ * 0 on success, negative errno on error, E2BIG on string truncation of name.
+ */
+__rte_experimental
+int
+rte_tel_data_add_dict_int(struct rte_tel_data *d, const char *name, int val);
+
+/**
+ * Add a uint64_t value to a dictionary.
+ * The dict must have been started by rte_tel_data_start_dict().
+ *
+ * @param d
+ * The data structure passed to the callback
+ * @param name
+ * The name the value is to be stored under in the dict
+ * @param val
+ * The number to be stored in the dict
* @return
- * -EPERM on failure
+ * 0 on success, negative errno on error, E2BIG on string truncation of name.
*/
-int32_t __rte_experimental
-rte_telemetry_cleanup(void);
+__rte_experimental
+int
+rte_tel_data_add_dict_u64(struct rte_tel_data *d,
+ const char *name, uint64_t val);
/**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
+ * This telemetry callback is used when registering a telemetry command.
+ * It handles getting and formatting information to be returned to telemetry
+ * when requested.
*
- * Runs various tests to ensure telemetry initialisation and register/unregister
- * functions are working correctly.
+ * @param cmd
+ * The cmd that was requested by the client.
+ * @param params
+ * Contains data required by the callback function.
+ * @param info
+ * The information to be returned to the caller.
+ *
+ * @return
+ * Length of buffer used on success.
+ * @return
+ * Negative integer on error.
+ */
+typedef int (*telemetry_cb)(const char *cmd, const char *params,
+ struct rte_tel_data *info);
+
+/**
+ * Used for handling data received over a telemetry socket.
+ *
+ * @param sock_id
+ * ID for the socket to be used by the handler.
+ *
+ * @return
+ * Void.
+ */
+typedef void * (*handler)(void *sock_id);
+
+/**
+ * Used when registering a command and callback function with telemetry.
+ *
+ * @param cmd
+ * The command to register with telemetry.
+ * @param fn
+ * Callback function to be called when the command is requested.
+ * @param help
+ * Help text for the command.
+ *
+ * @return
+ * 0 on success.
+ * @return
+ * -EINVAL for invalid parameters failure.
+ * @return
+ * -ENOENT if max callbacks limit has been reached.
+ */
+__rte_experimental
+int
+rte_telemetry_register_cmd(const char *cmd, telemetry_cb fn, const char *help);
+
+/**
+ * Initialize Telemetry.
*
* @return
- * 0 on success when all tests have passed
+ * 0 on success.
* @return
- * -1 on failure when the test has failed
+ * -1 on failure.
*/
-int32_t __rte_experimental
-rte_telemetry_selftest(void);
+__rte_experimental
+int
+rte_telemetry_init(const char *runtime_dir, const char **err_str);
#endif
git.droids-corp.org / dpdk.git / blobdiff