linux-gen: add runtime configuration file

Enables changing ODP runtime configuration options by using an optional
configuration file (libconfig). Path to the conf file is passed using
environment variable ODP_CONF_FILE. If ODP_CONF_FILE or a particular option
is not set, hardcoded default values are used instead. An template
configuration file is provided in config/odp-linux.conf.

Runtime configuration is initially used by DPDK pktio to set NIC options.

Adds new dependency to libconfig library.

Signed-off-by: Matias Elo <matias.elo@nokia.com>
Reviewed-by: Dmitry Eremin-Solenikov <dmitry.ereminsolenikov@linaro.org>
Reviewed-by: Bill Fischofer <bill.fischofer@linaro.org>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>

1 files changed, 99 insertions, 0 deletions

diff --git a/platform/linux-generic/odp_libconfig.c b/platform/linux-generic/odp_libconfig.c
new file mode 100644
index 000000000..3b3b31703
--- /dev/null
+++ b/platform/linux-generic/odp_libconfig.c
@@ -0,0 +1,99 @@
+/* Copyright (c) 2018, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <libconfig.h>
+
+#include <odp/api/version.h>
+#include <odp_internal.h>
+#include <odp_debug_internal.h>
+#include <odp_libconfig_internal.h>
+#include <odp_libconfig_config.h>
+
+#define CONF_STR_NAME ((const char *)odp_linux_generic_conf)
+
+extern struct odp_global_data_s odp_global_data;
+
+int _odp_libconfig_init_global(void)
+{
+	const char *filename;
+	const char *vers;
+	const char *vers_rt;
+	const char *ipml;
+	const char *ipml_rt;
+	config_t *config = &odp_global_data.libconfig_default;
+	config_t *config_rt = &odp_global_data.libconfig_runtime;
+
+	config_init(config);
+	config_init(config_rt);
+
+	if (!config_read_string(config, CONF_STR_NAME)) {
+		ODP_ERR("Failed to read default config: %s(%d): %s\n",
+			config_error_file(config), config_error_line(config),
+			config_error_text(config));
+		goto fail;
+	}
+
+	filename = getenv("ODP_CONFIG_FILE");
+	if (filename == NULL)
+		return 0;
+
+	if (!config_read_file(config_rt, filename)) {
+		ODP_ERR("Failed to read config file: %s(%d): %s\n",
+			config_error_file(config_rt),
+			config_error_line(config_rt),
+			config_error_text(config_rt));
+		goto fail;
+	}
+
+	/* Check runtime configuration's implementation name and version */
+	if (!config_lookup_string(config, "odp_implementation", &ipml) ||
+	    !config_lookup_string(config_rt, "odp_implementation", &ipml_rt)) {
+		ODP_ERR("Configuration missing 'odp_implementation' field\n");
+		goto fail;
+	}
+	if (!config_lookup_string(config, "config_file_version", &vers) ||
+	    !config_lookup_string(config_rt, "config_file_version", &vers_rt)) {
+		ODP_ERR("Configuration missing 'config_file_version' field\n");
+		goto fail;
+	}
+	if (strcmp(vers, vers_rt) || strcmp(ipml, ipml_rt)) {
+		ODP_ERR("Runtime configuration mismatch\n");
+		goto fail;
+	}
+
+	return 0;
+fail:
+	config_destroy(config);
+	config_destroy(config_rt);
+	return -1;
+}
+
+int _odp_libconfig_term_global(void)
+{
+	config_destroy(&odp_global_data.libconfig_default);
+	config_destroy(&odp_global_data.libconfig_runtime);
+
+	return 0;
+}
+
+int _odp_libconfig_lookup_int(const char *path, int *value)
+{
+	int ret_def = CONFIG_FALSE;
+	int ret_rt = CONFIG_FALSE;
+
+	ret_def = config_lookup_int(&odp_global_data.libconfig_default, path,
+				    value);
+
+	/* Runtime option overrides default value */
+	ret_rt = config_lookup_int(&odp_global_data.libconfig_runtime, path,
+				   value);
+
+	return  (ret_def == CONFIG_TRUE || ret_rt == CONFIG_TRUE) ? 1 : 0;
+}