[RFC PATCH 1/4] eal: add lcore info in telemetry

[Robin Jarry <rjarry@redhat.com>]

Report the same information than rte_lcore_dump() in the telemetry
API into /eal/lcore/list and /eal/lcore/info,ID.

Example:

  --> /eal/lcore/info,3
  {
    "/eal/lcore/info": {
      "lcore_id": 3,
      "socket": 0,
      "role": "RTE",
      "cpuset": "3"
    }
  }

Signed-off-by: Robin Jarry <rjarry@redhat.com>
---
 lib/eal/common/eal_common_lcore.c | 90 +++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/lib/eal/common/eal_common_lcore.c b/lib/eal/common/eal_common_lcore.c
index 06c594b0224f..31e3965dc5ad 100644
--- a/lib/eal/common/eal_common_lcore.c
+++ b/lib/eal/common/eal_common_lcore.c
@@ -10,6 +10,7 @@
 #include <rte_errno.h>
 #include <rte_lcore.h>
 #include <rte_log.h>
+#include <rte_telemetry.h>
 
 #include "eal_private.h"
 #include "eal_thread.h"
@@ -456,3 +457,92 @@ rte_lcore_dump(FILE *f)
 {
 	rte_lcore_iterate(lcore_dump_cb, f);
 }
+
+static int
+lcore_telemetry_id_cb(unsigned int lcore_id, void *arg)
+{
+	struct rte_tel_data *d = arg;
+	return rte_tel_data_add_array_int(d, lcore_id);
+}
+
+static int
+handle_lcore_list(const char *cmd __rte_unused,
+			const char *params __rte_unused,
+			struct rte_tel_data *d)
+{
+	int ret = rte_tel_data_start_array(d, RTE_TEL_INT_VAL);
+	if (ret)
+		return ret;
+	return rte_lcore_iterate(lcore_telemetry_id_cb, d);
+}
+
+struct lcore_telemetry_info {
+	unsigned int lcore_id;
+	struct rte_tel_data *d;
+};
+
+static int
+lcore_telemetry_info_cb(unsigned int lcore_id, void *arg)
+{
+	struct lcore_telemetry_info *info = arg;
+	struct rte_config *cfg = rte_eal_get_configuration();
+	char cpuset[RTE_CPU_AFFINITY_STR_LEN + 3];
+	const char *role;
+
+	if (info->lcore_id != lcore_id)
+		return 0;
+
+	switch (cfg->lcore_role[lcore_id]) {
+	case ROLE_RTE:
+		role = "RTE";
+		break;
+	case ROLE_SERVICE:
+		role = "SERVICE";
+		break;
+	case ROLE_NON_EAL:
+		role = "NON_EAL";
+		break;
+	default:
+		role = "UNKNOWN";
+		break;
+	}
+	if (eal_thread_dump_affinity(&lcore_config[lcore_id].cpuset, cpuset, sizeof(cpuset) - 3)) {
+		cpuset[sizeof(cpuset) - 4] = '.';
+		cpuset[sizeof(cpuset) - 3] = '.';
+		cpuset[sizeof(cpuset) - 2] = '.';
+		cpuset[sizeof(cpuset) - 1] = '\0';
+	}
+	rte_tel_data_start_dict(info->d);
+	rte_tel_data_add_dict_int(info->d, "lcore_id", lcore_id);
+	rte_tel_data_add_dict_int(info->d, "socket", rte_lcore_to_socket_id(lcore_id));
+	rte_tel_data_add_dict_string(info->d, "role", role);
+	rte_tel_data_add_dict_string(info->d, "cpuset", cpuset);
+
+	return 0;
+}
+
+static int
+handle_lcore_info(const char *cmd __rte_unused, const char *params, struct rte_tel_data *d)
+{
+	struct lcore_telemetry_info info = { .d = d };
+	char *endptr = NULL;
+	if (params == NULL || strlen(params) == 0)
+		return -EINVAL;
+	errno = 0;
+	info.lcore_id = strtoul(params, &endptr, 10);
+	if (errno)
+		return -errno;
+	if (endptr == params)
+		return -EINVAL;
+	return rte_lcore_iterate(lcore_telemetry_info_cb, &info);
+}
+
+RTE_INIT(lcore_telemetry)
+{
+	rte_telemetry_register_cmd(
+			"/eal/lcore/list", handle_lcore_list,
+			"List of lcore ids. Takes no parameters");
+	rte_telemetry_register_cmd(
+			"/eal/lcore/info", handle_lcore_info,
+			"Returns lcore info. Parameters: int lcore_id");
+}
-- 
2.38.1