ceph/src/spdk/dpdk/lib/librte_telemetry/rte_telemetry_legacy.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2020 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_TELEMETRY_LEGACY_H_
   6 #define _RTE_TELEMETRY_LEGACY_H_
   7
   8 #include <rte_compat.h>
   9 #include "rte_telemetry.h"
  10
  11 /**
  12  * @internal
  13  * @warning
  14  * @b EXPERIMENTAL: this API may change without prior notice
  15
  16  * @file
  17  * RTE Telemetry Legacy
  18  *
  19  ***/
  20
  21 /**
  22  * @internal
  23  * Value representing if data is required for the command
  24  */
  25 enum rte_telemetry_legacy_data_req {
  26         DATA_NOT_REQ = 0,
  27         DATA_REQ
  28 };
  29
  30 /**
  31  * This telemetry callback is used when registering a legacy telemetry command.
  32  * It handles getting and formatting stats to be returned to telemetry when
  33  * requested. Stats up to buf_len in length are put in the buffer.
  34  *
  35  * @param cmd
  36  * The cmd that was requested by the client.
  37  * @param params
  38  * Contains data required by the callback function.
  39  * @param buffer
  40  * A buffer to hold the formatted response.
  41  * @param buf_len
  42  * Length of the buffer.
  43  *
  44  * @return
  45  * Length of buffer used on success.
  46  * @return
  47  * Negative integer on error.
  48  */
  49 typedef int (*telemetry_legacy_cb)(const char *cmd, const char *params,
  50                 char *buffer, int buf_len);
  51
  52 /**
  53  * @internal
  54  * Counter for the number of registered legacy callbacks
  55  */
  56 extern int num_legacy_callbacks;
  57
  58 /**
  59  * @internal
  60  * Used for handling data received over the legacy telemetry socket.
  61  *
  62  * @return
  63  * Void.
  64  */
  65 void *
  66 legacy_client_handler(void *sock_id);
  67
  68 /**
  69  * @internal
  70  *
  71  * Used when registering a command and callback function with
  72  * telemetry legacy support.
  73  *
  74  * @return
  75  *  0 on success.
  76  * @return
  77  *  -EINVAL for invalid parameters failure.
  78  *  @return
  79  *  -ENOENT if max callbacks limit has been reached.
  80  */
  81 __rte_experimental
  82 int
  83 rte_telemetry_legacy_register(const char *cmd,
  84                 enum rte_telemetry_legacy_data_req data_req,
  85                 telemetry_legacy_cb fn);
  86
  87 #endif