On Tue, Oct 06, 2026 at 04:31:44PM -0700, Stephen Hemminger wrote:
> While investigating experimental functions leftover in DPDK.
>
> The rte_metrics_tel_* functions are dead code. Nothing in the tree
> calls them from outside the metrics library itself; they were left
> exported by the telemetry library rewrite in 20.05.
>
> Stop exporting them. Delete the header, move the types into the C file
> and make the helpers static. The file now only builds when jansson is
> present, so the stub branch goes away too.
>
> The legacy commands ports_all_stat_values, global_stat_values and
> ports_stats_values_by_name are unchanged.
>
> Signed-off-by: Stephen Hemminger <[email protected]>
> ---
> doc/guides/rel_notes/release_26_11.rst | 9 +++
> lib/metrics/meson.build | 6 +-
> lib/metrics/rte_metrics_telemetry.c | 106 ++++++-------------------
> lib/metrics/rte_metrics_telemetry.h | 71 -----------------
> 4 files changed, 39 insertions(+), 153 deletions(-)
> delete mode 100644 lib/metrics/rte_metrics_telemetry.h
>
In the process, should we post a deprecation notice for the whole
metrics-based legacy telemetry system? It's been superceded for many years
now and it has a lot of limitations: supporting ethdev only, having
globally registered stats (so if you have two different NIC types, you get
a list of all stats names for both whatever port you query), and probably
more beside. That would allow us to remove a large enough chunk of code in
a future release.
/Bruce
> diff --git a/doc/guides/rel_notes/release_26_11.rst
> b/doc/guides/rel_notes/release_26_11.rst
> index 934efaaf93..254e9ada64 100644
> --- a/doc/guides/rel_notes/release_26_11.rst
> +++ b/doc/guides/rel_notes/release_26_11.rst
> @@ -195,6 +195,15 @@ Removed Items
> which were based on the legacy pipeline library API.
> The ``pipeline`` example application covers the SWX pipeline API.
>
> +* metrics: Removed the experimental telemetry helper API
> + and the ``rte_metrics_telemetry.h`` header:
> + ``rte_metrics_tel_reg_all_ethdev``, ``rte_metrics_tel_encode_json_format``,
> + ``rte_metrics_tel_get_global_stats``,
> ``rte_metrics_tel_get_port_stats_ids``,
> + ``rte_metrics_tel_get_ports_stats_json`` and
> ``rte_metrics_tel_extract_data``.
> + These had no users and exposed jansson types in the public header.
> + The legacy telemetry commands ``ports_all_stat_values``,
> + ``global_stat_values`` and ``ports_stats_values_by_name`` are unchanged.
> +
> * net/iavf: Removed the ``auto_reconfig`` devarg.
>
> The restoration of the promiscuous and all-multicast settings after a VF
> reset
> diff --git a/lib/metrics/meson.build b/lib/metrics/meson.build
> index 6722f666d2..0e32a08dc3 100644
> --- a/lib/metrics/meson.build
> +++ b/lib/metrics/meson.build
> @@ -1,10 +1,12 @@
> # SPDX-License-Identifier: BSD-3-Clause
> # Copyright(c) 2017 Intel Corporation
>
> -sources = files('rte_metrics.c', 'rte_metrics_telemetry.c')
> -headers = files('rte_metrics.h', 'rte_metrics_telemetry.h')
> +sources = files('rte_metrics.c')
> +headers = files('rte_metrics.h')
>
> +# Legacy JSON telemetry commands are only available with jansson.
> if dpdk_conf.has('RTE_HAS_JANSSON')
> + sources += files('rte_metrics_telemetry.c')
> ext_deps += jansson_dep
> endif
>
> diff --git a/lib/metrics/rte_metrics_telemetry.c
> b/lib/metrics/rte_metrics_telemetry.c
> index f9ec556595..2350ef5041 100644
> --- a/lib/metrics/rte_metrics_telemetry.c
> +++ b/lib/metrics/rte_metrics_telemetry.c
> @@ -2,19 +2,35 @@
> * Copyright(c) 2020 Intel Corporation
> */
>
> +#include <jansson.h>
> +
> #include <ethdev_driver.h>
> -#include <eal_export.h>
> #include <rte_string_fns.h>
> #ifdef RTE_LIB_TELEMETRY
> #include <telemetry_internal.h>
> #endif
>
> #include "rte_metrics.h"
> -#include "rte_metrics_telemetry.h"
> -
> -#ifdef RTE_HAS_JANSSON
>
> -struct telemetry_metrics_data tel_met_data;
> +enum rte_telemetry_stats_type {
> + PORT_STATS = 0,
> + GLOBAL_STATS = 1
> +};
> +
> +struct telemetry_encode_param {
> + enum rte_telemetry_stats_type type;
> + struct port_param {
> + int num_metric_ids;
> + uint32_t metric_ids[RTE_METRICS_MAX_METRICS];
> + int num_port_ids;
> + uint32_t port_ids[RTE_MAX_ETHPORTS];
> + } pp;
> +};
> +
> +static struct telemetry_metrics_data {
> + int reg_index[RTE_MAX_ETHPORTS];
> + int metrics_register_done;
> +} tel_met_data;
>
> int metrics_log_level;
> #define RTE_LOGTYPE_METRICS metrics_log_level
> @@ -72,8 +88,7 @@ rte_metrics_tel_reg_port_ethdev_to_metrics(uint16_t port_id)
> return ret;
> }
>
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_reg_all_ethdev, 20.05)
> -int32_t
> +static int32_t
> rte_metrics_tel_reg_all_ethdev(int *metrics_register_done, int
> *reg_index_list)
> {
> struct driver_index {
> @@ -227,8 +242,7 @@ rte_metrics_tel_format_port(uint32_t pid, json_t *ports,
> return ret;
> }
>
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_encode_json_format, 20.05)
> -int32_t
> +static int32_t
> rte_metrics_tel_encode_json_format(struct telemetry_encode_param *ep,
> char **json_buffer)
> {
> @@ -281,8 +295,7 @@ rte_metrics_tel_encode_json_format(struct
> telemetry_encode_param *ep,
> return 0;
> }
>
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_get_ports_stats_json, 20.05)
> -int32_t
> +static int32_t
> rte_metrics_tel_get_ports_stats_json(struct telemetry_encode_param *ep,
> int *reg_index, char **json_buffer)
> {
> @@ -312,8 +325,7 @@ rte_metrics_tel_get_ports_stats_json(struct
> telemetry_encode_param *ep,
> return 0;
> }
>
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_get_port_stats_ids, 20.05)
> -int32_t
> +static int32_t
> rte_metrics_tel_get_port_stats_ids(struct telemetry_encode_param *ep)
> {
> int p, num_port_ids = 0;
> @@ -379,8 +391,7 @@ rte_metrics_tel_stat_names_to_ids(const char * const
> *stat_names,
> return 0;
> }
>
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_extract_data, 20.05)
> -int32_t
> +static int32_t
> rte_metrics_tel_extract_data(struct telemetry_encode_param *ep, json_t *data)
> {
> int ret;
> @@ -547,68 +558,3 @@ RTE_INIT(metrics_ctor)
> handle_ports_stats_values_by_name);
> #endif
> }
> -
> -#else /* !RTE_HAS_JANSSON */
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_reg_all_ethdev, 20.05)
> -int32_t
> -rte_metrics_tel_reg_all_ethdev(int *metrics_register_done, int
> *reg_index_list)
> -{
> - RTE_SET_USED(metrics_register_done);
> - RTE_SET_USED(reg_index_list);
> -
> - return -ENOTSUP;
> -}
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_encode_json_format, 20.05)
> -int32_t
> -rte_metrics_tel_encode_json_format(struct telemetry_encode_param *ep,
> - char **json_buffer)
> -{
> - RTE_SET_USED(ep);
> - RTE_SET_USED(json_buffer);
> -
> - return -ENOTSUP;
> -}
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_get_ports_stats_json, 20.05)
> -int32_t
> -rte_metrics_tel_get_ports_stats_json(struct telemetry_encode_param *ep,
> - int *reg_index, char **json_buffer)
> -{
> - RTE_SET_USED(ep);
> - RTE_SET_USED(reg_index);
> - RTE_SET_USED(json_buffer);
> -
> - return -ENOTSUP;
> -}
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_get_port_stats_ids, 20.05)
> -int32_t
> -rte_metrics_tel_get_port_stats_ids(struct telemetry_encode_param *ep)
> -{
> - RTE_SET_USED(ep);
> -
> - return -ENOTSUP;
> -}
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_extract_data, 20.05)
> -int32_t
> -rte_metrics_tel_extract_data(struct telemetry_encode_param *ep, json_t *data)
> -{
> - RTE_SET_USED(ep);
> - RTE_SET_USED(data);
> -
> - return -ENOTSUP;
> -}
> -
> -RTE_EXPORT_EXPERIMENTAL_SYMBOL(rte_metrics_tel_get_global_stats, 20.05)
> -int32_t
> -rte_metrics_tel_get_global_stats(struct telemetry_encode_param *ep)
> -{
> - RTE_SET_USED(ep);
> -
> - return -ENOTSUP;
> -}
> -
> -#endif /* !RTE_HAS_JANSSON */
> diff --git a/lib/metrics/rte_metrics_telemetry.h
> b/lib/metrics/rte_metrics_telemetry.h
> deleted file mode 100644
> index dd84f5431e..0000000000
> --- a/lib/metrics/rte_metrics_telemetry.h
> +++ /dev/null
> @@ -1,71 +0,0 @@
> -/* SPDX-License-Identifier: BSD-3-Clause
> - * Copyright(c) 2020 Intel Corporation
> - */
> -
> -#ifdef RTE_HAS_JANSSON
> -#include <jansson.h>
> -#else
> -#define json_t void *
> -#endif
> -
> -#include <rte_compat.h>
> -#include "rte_metrics.h"
> -
> -#ifndef _RTE_METRICS_TELEMETRY_H_
> -#define _RTE_METRICS_TELEMETRY_H_
> -
> -#ifdef __cplusplus
> -extern "C" {
> -#endif
> -
> -enum rte_telemetry_stats_type {
> - PORT_STATS = 0,
> - GLOBAL_STATS = 1
> -};
> -
> -struct telemetry_encode_param {
> - enum rte_telemetry_stats_type type;
> - struct port_param {
> - int num_metric_ids;
> - uint32_t metric_ids[RTE_METRICS_MAX_METRICS];
> - int num_port_ids;
> - uint32_t port_ids[RTE_MAX_ETHPORTS];
> - } pp;
> -};
> -
> -struct telemetry_metrics_data {
> - int reg_index[RTE_MAX_ETHPORTS];
> - int metrics_register_done;
> -};
> -
> -__rte_experimental
> -int32_t rte_metrics_tel_reg_all_ethdev(int *metrics_register_done,
> - int *reg_index_list);
> -
> -__rte_experimental
> -int32_t
> -rte_metrics_tel_encode_json_format(struct telemetry_encode_param *ep,
> - char **json_buffer);
> -
> -__rte_experimental
> -int32_t
> -rte_metrics_tel_get_global_stats(struct telemetry_encode_param *ep);
> -
> -__rte_experimental
> -int32_t
> -rte_metrics_tel_get_port_stats_ids(struct telemetry_encode_param *ep);
> -
> -__rte_experimental
> -int32_t
> -rte_metrics_tel_get_ports_stats_json(struct telemetry_encode_param *ep,
> - int *reg_index, char **json_buffer);
> -
> -__rte_experimental
> -int32_t
> -rte_metrics_tel_extract_data(struct telemetry_encode_param *ep, json_t
> *data);
> -
> -#ifdef __cplusplus
> -}
> -#endif
> -
> -#endif
> --
> 2.53.0
>
