[dpdk-dev] [RFC 2/6] eal: integrate process-info library

[Ciara Power]

From: Bruce Richardson <bruce.richardson at intel.com>

Integrate the process info library into the EAL.
 - Initialize the process-info library as part of EAL init.
   This can be disabled using an EAL parameter.
 - Register commands to provide some basic info from EAL.

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
Signed-off-by: Ciara Power <ciara.power at intel.com>
---
 lib/Makefile                               |  2 +-
 lib/librte_eal/common/eal_common_options.c | 75 ++++++++++++++++++++++
 lib/librte_eal/common/eal_internal_cfg.h   |  1 +
 lib/librte_eal/common/eal_options.h        |  5 ++
 lib/librte_eal/freebsd/eal/Makefile        |  1 +
 lib/librte_eal/freebsd/eal/eal.c           | 14 ++++
 lib/librte_eal/linux/eal/Makefile          |  1 +
 lib/librte_eal/linux/eal/eal.c             | 15 +++++
 lib/librte_eal/meson.build                 |  2 +-
 9 files changed, 114 insertions(+), 2 deletions(-)

diff --git a/lib/Makefile b/lib/Makefile
index 466cd04ef..cc61176da 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -6,7 +6,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
 DIRS-$(CONFIG_RTE_LIBRTE_KVARGS) += librte_kvargs
 DIRS-$(CONFIG_RTE_LIBRTE_PROCESS_INFO) += librte_process_info
 DIRS-$(CONFIG_RTE_LIBRTE_EAL) += librte_eal
-DEPDIRS-librte_eal := librte_kvargs
+DEPDIRS-librte_eal := librte_kvargs librte_process_info
 DIRS-$(CONFIG_RTE_LIBRTE_PCI) += librte_pci
 DEPDIRS-librte_pci := librte_eal
 DIRS-$(CONFIG_RTE_LIBRTE_RING) += librte_ring
diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index a7f9c5f9b..0839a523d 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -25,6 +25,7 @@
 #include <rte_version.h>
 #include <rte_devargs.h>
 #include <rte_memcpy.h>
+#include <rte_process_info.h>
 
 #include "eal_internal_cfg.h"
 #include "eal_options.h"
@@ -82,6 +83,7 @@ eal_long_options[] = {
 	{OPT_LEGACY_MEM,        0, NULL, OPT_LEGACY_MEM_NUM       },
 	{OPT_SINGLE_FILE_SEGMENTS, 0, NULL, OPT_SINGLE_FILE_SEGMENTS_NUM},
 	{OPT_MATCH_ALLOCATIONS, 0, NULL, OPT_MATCH_ALLOCATIONS_NUM},
+	{OPT_NO_PROCESS_INFO,   0, NULL, OPT_NO_PROCESS_INFO_NUM  },
 	{0,                     0, NULL, 0                        }
 };
 
@@ -126,6 +128,75 @@ static int master_lcore_parsed;
 static int mem_parsed;
 static int core_parsed;
 
+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 process_info 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 if (strcmp(cmd, EAL_APP_PARAM_REQ) == 0)
+		args = eal_app_args;
+	else /* version */
+		return snprintf(buffer, buf_len, "\"%s\"", rte_version());
+
+	if (args == NULL || args[0] == NULL)
+		return snprintf(buffer, buf_len, "[]"); /* empty list */
+
+	used = strlcpy(buffer, "[", buf_len);
+	while (args[i] != NULL)
+		used += snprintf(buffer + used, buf_len - used, "\"%s\",",
+				args[i++]);
+	buffer[used - 1] = ']';
+	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_process_info_register(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_process_info_register(EAL_APP_PARAM_REQ, handle_eal_info_request);
+
+	return 0;
+}
+
 static int
 eal_option_device_add(enum rte_devtype type, const char *optarg)
 {
@@ -1446,6 +1517,9 @@ eal_parse_common_option(int opt, const char *optarg,
 			return -1;
 		}
 		break;
+	case OPT_NO_PROCESS_INFO_NUM:
+		conf->no_process_info = 1;
+		break;
 
 	/* don't know what to do, leave this to caller */
 	default:
@@ -1687,6 +1761,7 @@ eal_common_usage(void)
 	       "  --"OPT_IN_MEMORY"   Operate entirely in memory. This will\n"
 	       "                      disable secondary process support\n"
 	       "  --"OPT_BASE_VIRTADDR"     Base virtual address\n"
+	       "  --"OPT_NO_PROCESS_INFO"   Disable process info\n"
 	       "\nEAL options for DEBUG use only:\n"
 	       "  --"OPT_HUGE_UNLINK"       Unlink hugepage files after init\n"
 	       "  --"OPT_NO_HUGE"           Use malloc instead of hugetlbfs\n"
diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h
index a42f34923..c8226cb44 100644
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -82,6 +82,7 @@ struct internal_config {
 	rte_cpuset_t ctrl_cpuset;         /**< cpuset for ctrl threads */
 	volatile unsigned int init_complete;
 	/**< indicates whether EAL has completed initialization */
+	unsigned int no_process_info;   /**< true to disable Process Info */
 };
 extern struct internal_config internal_config; /**< Global EAL configuration. */
 
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index 9855429e5..0692666ef 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -69,6 +69,8 @@ enum {
 	OPT_IOVA_MODE_NUM,
 #define OPT_MATCH_ALLOCATIONS  "match-allocations"
 	OPT_MATCH_ALLOCATIONS_NUM,
+#define OPT_NO_PROCESS_INFO    "no-process-info"
+	OPT_NO_PROCESS_INFO_NUM,
 	OPT_LONG_MAX_NUM
 };
 
@@ -84,5 +86,8 @@ 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/Makefile b/lib/librte_eal/freebsd/eal/Makefile
index b160b5790..3fd0d5edd 100644
--- a/lib/librte_eal/freebsd/eal/Makefile
+++ b/lib/librte_eal/freebsd/eal/Makefile
@@ -19,6 +19,7 @@ LDLIBS += -lexecinfo
 LDLIBS += -lpthread
 LDLIBS += -lgcc_s
 LDLIBS += -lrte_kvargs
+LDLIBS += -lrte_process_info
 
 EXPORT_MAP := ../../rte_eal_version.map
 
diff --git a/lib/librte_eal/freebsd/eal/eal.c b/lib/librte_eal/freebsd/eal/eal.c
index 6ae37e7e6..6d52b035f 100644
--- a/lib/librte_eal/freebsd/eal/eal.c
+++ b/lib/librte_eal/freebsd/eal/eal.c
@@ -44,6 +44,7 @@
 #include <rte_option.h>
 #include <rte_atomic.h>
 #include <malloc_heap.h>
+#include <rte_process_info.h>
 
 #include "eal_private.h"
 #include "eal_thread.h"
@@ -724,6 +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);
 
@@ -952,6 +956,16 @@ rte_eal_init(int argc, char **argv)
 		rte_eal_init_alert("Cannot clear runtime directory\n");
 		return -1;
 	}
+	if (!internal_config.no_process_info)  {
+		const char *error_str;
+		if (rte_process_info_init(rte_eal_get_runtime_dir(),
+				&error_str) != 0) {
+			rte_eal_init_alert(error_str);
+			return -1;
+		}
+		rte_process_info_register("/eal:version",
+				handle_eal_info_request);
+	}
 
 	eal_mcfg_complete();
 
diff --git a/lib/librte_eal/linux/eal/Makefile b/lib/librte_eal/linux/eal/Makefile
index e70cf104a..d09d2b4d0 100644
--- a/lib/librte_eal/linux/eal/Makefile
+++ b/lib/librte_eal/linux/eal/Makefile
@@ -23,6 +23,7 @@ LDLIBS += -lpthread
 LDLIBS += -lgcc_s
 LDLIBS += -lrt
 LDLIBS += -lrte_kvargs
+LDLIBS += -lrte_process_info
 ifeq ($(CONFIG_RTE_EAL_NUMA_AWARE_HUGEPAGES),y)
 LDLIBS += -lnuma
 endif
diff --git a/lib/librte_eal/linux/eal/eal.c b/lib/librte_eal/linux/eal/eal.c
index c4233ec3c..e191be6e0 100644
--- a/lib/librte_eal/linux/eal/eal.c
+++ b/lib/librte_eal/linux/eal/eal.c
@@ -50,6 +50,7 @@
 #include <malloc_heap.h>
 #include <rte_vfio.h>
 #include <rte_option.h>
+#include <rte_process_info.h>
 
 #include "eal_private.h"
 #include "eal_thread.h"
@@ -987,6 +988,9 @@ 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);
 
@@ -1291,6 +1295,17 @@ rte_eal_init(int argc, char **argv)
 		return -1;
 	}
 
+	if (!internal_config.no_process_info)  {
+		const char *error_str;
+		if (rte_process_info_init(rte_eal_get_runtime_dir(),
+				&error_str) != 0) {
+			rte_eal_init_alert(error_str);
+			return -1;
+		}
+		rte_process_info_register("/eal:version",
+				handle_eal_info_request);
+	}
+
 	eal_mcfg_complete();
 
 	/* Call each registered callback, if enabled */
diff --git a/lib/librte_eal/meson.build b/lib/librte_eal/meson.build
index 4be5118ce..89ee3b6b8 100644
--- a/lib/librte_eal/meson.build
+++ b/lib/librte_eal/meson.build
@@ -13,7 +13,7 @@ dpdk_conf.set('RTE_EXEC_ENV_' + exec_env.to_upper(), 1)
 subdir(exec_env + '/eal')
 
 allow_experimental_apis = true
-deps += 'kvargs'
+deps += ['kvargs', 'process_info']
 if dpdk_conf.has('RTE_USE_LIBBSD')
 	ext_deps += libbsd
 endif
-- 
2.17.1