[RESEND,v7,2/3] ring: add telemetry cmd to list rings

  Add a telemetry command to list the rings used in the system.
An example using this command is shown below:

--> /ring/list
{
  "/ring/list": [
    "HT_0000:7d:00.2",
    "MP_mb_pool_0"
  ]
}

Signed-off-by: Jie Hai <haijie1@huawei.com>
Acked-by: Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Acked-by: Huisong Li <lihuisong@huawei.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
---
 lib/ring/meson.build |  1 +
 lib/ring/rte_ring.c  | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
  

Acked-by: Huisong Li <lihuisong@huawei.com>

在 2023/11/9 18:20, Jie Hai 写道:
> Add a telemetry command to list the rings used in the system.
> An example using this command is shown below:
>
> --> /ring/list
> {
>    "/ring/list": [
>      "HT_0000:7d:00.2",
>      "MP_mb_pool_0"
>    ]
> }
>
> Signed-off-by: Jie Hai <haijie1@huawei.com>
> Acked-by: Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Acked-by: Huisong Li <lihuisong@huawei.com>
> Acked-by: Chengwen Feng <fengchengwen@huawei.com>
> Acked-by: Morten Brørup <mb@smartsharesystems.com>
> ---
>   lib/ring/meson.build |  1 +
>   lib/ring/rte_ring.c  | 40 ++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 41 insertions(+)
>
> diff --git a/lib/ring/meson.build b/lib/ring/meson.build
> index c20685c689ac..7fca958ed7fa 100644
> --- a/lib/ring/meson.build
> +++ b/lib/ring/meson.build
> @@ -18,3 +18,4 @@ indirect_headers += files (
>           'rte_ring_rts.h',
>           'rte_ring_rts_elem_pvt.h',
>   )
> +deps += ['telemetry']
> diff --git a/lib/ring/rte_ring.c b/lib/ring/rte_ring.c
> index 057d25ff6f2f..6a10280fb093 100644
> --- a/lib/ring/rte_ring.c
> +++ b/lib/ring/rte_ring.c
> @@ -22,6 +22,7 @@
>   #include <rte_errno.h>
>   #include <rte_string_fns.h>
>   #include <rte_tailq.h>
> +#include <rte_telemetry.h>
>   
>   #include "rte_ring.h"
>   #include "rte_ring_elem.h"
> @@ -418,3 +419,42 @@ rte_ring_lookup(const char *name)
>   
>   	return r;
>   }
> +
> +static void
> +ring_walk(void (*func)(struct rte_ring *, void *), void *arg)
> +{
> +	struct rte_ring_list *ring_list;
> +	struct rte_tailq_entry *tailq_entry;
> +
> +	ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
> +	rte_mcfg_tailq_read_lock();
> +
> +	TAILQ_FOREACH(tailq_entry, ring_list, next) {
> +		(*func)((struct rte_ring *) tailq_entry->data, arg);
> +	}
> +
> +	rte_mcfg_tailq_read_unlock();
> +}
> +
> +static void
> +ring_list_cb(struct rte_ring *r, void *arg)
> +{
> +	struct rte_tel_data *d = (struct rte_tel_data *)arg;
> +
> +	rte_tel_data_add_array_string(d, r->name);
> +}
> +
> +static int
> +ring_handle_list(const char *cmd __rte_unused,
> +		const char *params __rte_unused, struct rte_tel_data *d)
> +{
> +	rte_tel_data_start_array(d, RTE_TEL_STRING_VAL);
> +	ring_walk(ring_list_cb, d);
> +	return 0;
> +}
> +
> +RTE_INIT(ring_init_telemetry)
> +{
> +	rte_telemetry_register_cmd("/ring/list", ring_handle_list,
> +		"Returns list of available rings. Takes no parameters");
> +}