From: Bruce Richardson <bruce.richard...@intel.com>

EAL now registers commands to provide some basic info from EAL.

Example:
Connecting to /var/run/dpdk/rte/dpdk_telemetry.v2
{"pid": 926, "version": "DPDK 20.05.0-rc0", "max_output_len": 16384}
--> /
{"/": ["/", "/eal/app_params", "/eal/params", "/ethdev/link_status", \
    "/ethdev/list", "/ethdev/xstats", "/info", "/rawdev/list", \
    "/rawdev/xstats"]}
--> /eal/app_params
{"/eal/app_params": ["-i"]}
--> /eal/params
{"/eal/params": ["./app/dpdk-testpmd"]}

Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
Signed-off-by: Ciara Power <ciara.po...@intel.com>

---
v2:
  - Removed /eal/version command as /info replaces it.
  - Compile telemetry callbacks and include headers if not in Windows
    execution environment.
---
 lib/librte_eal/common/eal_common_options.c | 70 ++++++++++++++++++++++
 lib/librte_eal/common/eal_options.h        |  3 +
 lib/librte_eal/freebsd/eal.c               |  3 +
 lib/librte_eal/linux/eal.c                 |  3 +
 4 files changed, 79 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_options.c 
b/lib/librte_eal/common/eal_common_options.c
index ca10e0524d..4e2bd90147 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -29,6 +29,9 @@
 #include <rte_version.h>
 #include <rte_devargs.h>
 #include <rte_memcpy.h>
+#ifndef RTE_EXEC_ENV_WINDOWS
+#include <rte_telemetry.h>
+#endif
 
 #include "eal_internal_cfg.h"
 #include "eal_options.h"
@@ -132,6 +135,73 @@ static int master_lcore_parsed;
 static int mem_parsed;
 static int core_parsed;
 
+#ifndef RTE_EXEC_ENV_WINDOWS
+static char **eal_args;
+static char **eal_app_args;
+
+#define EAL_PARAM_REQ "/eal/params"
+#define EAL_APP_PARAM_REQ "/eal/app_params"
+
+/* callback handler for telemetry library to report out EAL flags */
+int
+handle_eal_info_request(const char *cmd, const char *params __rte_unused,
+               char *buffer, int buf_len)
+{
+       char **args;
+       int used = 0;
+       int i = 0;
+
+       if (strcmp(cmd, EAL_PARAM_REQ) == 0)
+               args = eal_args;
+       else
+               args = eal_app_args;
+
+       if (args == NULL || args[0] == NULL)
+               return rte_tel_json_empty_array(buffer, buf_len, used);
+
+       for ( ; args[i] != NULL; i++)
+               used = rte_tel_json_add_array_string(buffer, buf_len, used,
+                               args[i]);
+       return used;
+}
+
+int
+eal_save_args(int argc, char **argv)
+{
+       int i, j;
+
+       /* clone argv to report out later. We overprovision, but
+        * this does not waste huge amounts of memory
+        */
+       eal_args = calloc(argc + 1, sizeof(*eal_args));
+       if (eal_args == NULL)
+               return -1;
+
+       for (i = 0; i < argc; i++) {
+               eal_args[i] = strdup(argv[i]);
+               if (strcmp(argv[i], "--") == 0)
+                       break;
+       }
+       eal_args[i++] = NULL; /* always finish with NULL */
+       rte_telemetry_register_cmd(EAL_PARAM_REQ, handle_eal_info_request);
+
+       /* allow reporting of any app args we know about too */
+       if (i == argc)
+               return 0;
+
+       eal_app_args = calloc(argc - i + 1, sizeof(*eal_args));
+       if (eal_app_args == NULL)
+               return -1;
+
+       for (j = 0; i < argc; j++, i++)
+               eal_app_args[j] = strdup(argv[i]);
+       eal_app_args[j] = NULL;
+       rte_telemetry_register_cmd(EAL_APP_PARAM_REQ, handle_eal_info_request);
+
+       return 0;
+}
+#endif
+
 static int
 eal_option_device_add(enum rte_devtype type, const char *optarg)
 {
diff --git a/lib/librte_eal/common/eal_options.h 
b/lib/librte_eal/common/eal_options.h
index 225ad4bb59..5373e9f5e3 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -88,5 +88,8 @@ int eal_check_common_options(struct internal_config 
*internal_cfg);
 void eal_common_usage(void);
 enum rte_proc_type_t eal_proc_type_detect(void);
 int eal_plugins_init(void);
+int eal_save_args(int argc, char **argv);
+int handle_eal_info_request(const char *cmd, const char *params __rte_unused,
+               char *buffer, int buf_len);
 
 #endif /* EAL_OPTIONS_H */
diff --git a/lib/librte_eal/freebsd/eal.c b/lib/librte_eal/freebsd/eal.c
index 54acafc312..d5017e86b2 100644
--- a/lib/librte_eal/freebsd/eal.c
+++ b/lib/librte_eal/freebsd/eal.c
@@ -725,6 +725,9 @@ rte_eal_init(int argc, char **argv)
 
        eal_reset_internal_config(&internal_config);
 
+       /* clone argv to report out later in telemetry */
+       eal_save_args(argc, argv);
+
        /* set log level as early as possible */
        eal_log_level_parse(argc, argv);
 
diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
index 8eeffe9aa3..b80401df9a 100644
--- a/lib/librte_eal/linux/eal.c
+++ b/lib/librte_eal/linux/eal.c
@@ -992,6 +992,9 @@ rte_eal_init(int argc, char **argv)
        /* set log level as early as possible */
        eal_log_level_parse(argc, argv);
 
+       /* clone argv to report out later in telemetry */
+       eal_save_args(argc, argv);
+
        if (rte_eal_cpu_init() < 0) {
                rte_eal_init_alert("Cannot detect lcores.");
                rte_errno = ENOTSUP;
-- 
2.17.1

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