[dpdk-dev] [PATCH v4 1/2] eal: move plugin loading to eal/common

[Panu Matilainen]

There's no good reason to limit plugins to Linux, make it available
on FreeBSD too. Refactor the plugin code from Linux EAL to common
helper functions, also check for and fail on errors during initialization.

Signed-off-by: Panu Matilainen <pmatilai at redhat.com>
---
 lib/librte_eal/bsdapp/eal/eal.c            |  3 ++
 lib/librte_eal/common/eal_common_options.c | 55 ++++++++++++++++++++++++++++++
 lib/librte_eal/common/eal_options.h        |  1 +
 lib/librte_eal/linuxapp/eal/eal.c          | 40 ++--------------------
 4 files changed, 61 insertions(+), 38 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c
index b64bbfc..a34e61d 100644
--- a/lib/librte_eal/bsdapp/eal/eal.c
+++ b/lib/librte_eal/bsdapp/eal/eal.c
@@ -571,6 +571,9 @@ rte_eal_init(int argc, char **argv)
 
 	rte_eal_mcfg_complete();
 
+	if (eal_plugins_init() < 0)
+		rte_panic("Cannot init plugins\n");
+
 	eal_thread_init_master(rte_config.master_lcore);
 
 	ret = eal_thread_dump_affinity(cpuset, RTE_CPU_AFFINITY_STR_LEN);
diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 79db608..ae0187a 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -39,6 +39,7 @@
 #include <limits.h>
 #include <errno.h>
 #include <getopt.h>
+#include <dlfcn.h>
 
 #include <rte_eal.h>
 #include <rte_log.h>
@@ -94,6 +95,20 @@ eal_long_options[] = {
 	{0,                     0, NULL, 0                        }
 };
 
+TAILQ_HEAD(shared_driver_list, shared_driver);
+
+/* Definition for shared object drivers. */
+struct shared_driver {
+	TAILQ_ENTRY(shared_driver) next;
+
+	char    name[PATH_MAX];
+	void*   lib_handle;
+};
+
+/* List of external loadable drivers */
+static struct shared_driver_list solib_list =
+TAILQ_HEAD_INITIALIZER(solib_list);
+
 static int master_lcore_parsed;
 static int mem_parsed;
 
@@ -134,6 +149,40 @@ eal_reset_internal_config(struct internal_config *internal_cfg)
 	internal_cfg->create_uio_dev = 0;
 }
 
+static int
+eal_plugin_add(const char *path)
+{
+	struct shared_driver *solib;
+
+	solib = malloc(sizeof(*solib));
+	if (solib == NULL) {
+		RTE_LOG(ERR, EAL, "malloc(solib) failed\n");
+		return -1;
+	}
+	memset(solib, 0, sizeof(*solib));
+	strncpy(solib->name, path, PATH_MAX-1);
+	solib->name[PATH_MAX-1] = 0;
+	TAILQ_INSERT_TAIL(&solib_list, solib, next);
+
+	return 0;
+}
+
+int
+eal_plugins_init(void)
+{
+	struct shared_driver *solib = NULL;
+
+	TAILQ_FOREACH(solib, &solib_list, next) {
+		RTE_LOG(DEBUG, EAL, "open shared lib %s\n", solib->name);
+		solib->lib_handle = dlopen(solib->name, RTLD_NOW);
+		if (solib->lib_handle == NULL) {
+			RTE_LOG(ERR, EAL, "%s\n", dlerror());
+			return -1;
+		}
+	}
+	return 0;
+}
+
 /*
  * Parse the coremask given as argument (hexadecimal string) and fill
  * the global configuration (core role and core count) with the parsed
@@ -713,6 +762,11 @@ eal_parse_common_option(int opt, const char *optarg,
 		 * even if info or warning messages are disabled */
 		RTE_LOG(CRIT, EAL, "RTE Version: '%s'\n", rte_version());
 		break;
+	/* force loading of external driver */
+	case 'd':
+		if (eal_plugin_add(optarg) == -1)
+			return -1;
+		break;
 
 	/* long options */
 	case OPT_HUGE_UNLINK_NUM:
@@ -898,6 +952,7 @@ eal_common_usage(void)
 	       "  --"OPT_PROC_TYPE"         Type of this process (primary|secondary|auto)\n"
 	       "  --"OPT_SYSLOG"            Set syslog facility\n"
 	       "  --"OPT_LOG_LEVEL"         Set default log level\n"
+	       "  -d LIB.so           Add driver (can be used multiple times)\n"
 	       "  -v                  Display version information on startup\n"
 	       "  -h, --help          This help\n"
 	       "\nEAL options for DEBUG use only:\n"
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index 4245fd5..a881c62 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -95,5 +95,6 @@ int eal_adjust_config(struct internal_config *internal_cfg);
 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);
 
 #endif /* EAL_OPTIONS_H */
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 18fe19b..06536f2 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -43,7 +43,6 @@
 #include <getopt.h>
 #include <sys/file.h>
 #include <fcntl.h>
-#include <dlfcn.h>
 #include <stddef.h>
 #include <errno.h>
 #include <limits.h>
@@ -90,20 +89,6 @@
 /* Allow the application to print its usage message too if set */
 static rte_usage_hook_t	rte_application_usage_hook = NULL;
 
-TAILQ_HEAD(shared_driver_list, shared_driver);
-
-/* Definition for shared object drivers. */
-struct shared_driver {
-	TAILQ_ENTRY(shared_driver) next;
-
-	char    name[PATH_MAX];
-	void*   lib_handle;
-};
-
-/* List of external loadable drivers */
-static struct shared_driver_list solib_list =
-TAILQ_HEAD_INITIALIZER(solib_list);
-
 /* early configuration structure, when memory config is not mmapped */
 static struct rte_mem_config early_mem_config;
 
@@ -350,7 +335,6 @@ eal_usage(const char *prgname)
 	printf("\nUsage: %s ", prgname);
 	eal_common_usage();
 	printf("EAL Linux options:\n"
-	       "  -d LIB.so           Add driver (can be used multiple times)\n"
 	       "  --"OPT_SOCKET_MEM"        Memory to allocate on sockets (comma separated values)\n"
 	       "  --"OPT_HUGE_DIR"          Directory where hugetlbfs is mounted\n"
 	       "  --"OPT_FILE_PREFIX"       Prefix for hugepage filenames\n"
@@ -545,7 +529,6 @@ eal_parse_args(int argc, char **argv)
 	char **argvopt;
 	int option_index;
 	char *prgname = argv[0];
-	struct shared_driver *solib;
 	const int old_optind = optind;
 	const int old_optopt = optopt;
 	char * const old_optarg = optarg;
@@ -579,20 +562,6 @@ eal_parse_args(int argc, char **argv)
 			eal_usage(prgname);
 			exit(EXIT_SUCCESS);
 
-		/* force loading of external driver */
-		case 'd':
-			solib = malloc(sizeof(*solib));
-			if (solib == NULL) {
-				RTE_LOG(ERR, EAL, "malloc(solib) failed\n");
-				ret = -1;
-				goto out;
-			}
-			memset(solib, 0, sizeof(*solib));
-			strncpy(solib->name, optarg, PATH_MAX-1);
-			solib->name[PATH_MAX-1] = 0;
-			TAILQ_INSERT_TAIL(&solib_list, solib, next);
-			break;
-
 		/* long options */
 		case OPT_XEN_DOM0_NUM:
 #ifdef RTE_LIBRTE_XEN_DOM0
@@ -758,7 +727,6 @@ rte_eal_init(int argc, char **argv)
 	int i, fctret, ret;
 	pthread_t thread_id;
 	static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0);
-	struct shared_driver *solib = NULL;
 	const char *logid;
 	char cpuset[RTE_CPU_AFFINITY_STR_LEN];
 	char thread_name[RTE_MAX_THREAD_NAME_LEN];
@@ -852,12 +820,8 @@ rte_eal_init(int argc, char **argv)
 
 	rte_eal_mcfg_complete();
 
-	TAILQ_FOREACH(solib, &solib_list, next) {
-		RTE_LOG(DEBUG, EAL, "open shared lib %s\n", solib->name);
-		solib->lib_handle = dlopen(solib->name, RTLD_NOW);
-		if (solib->lib_handle == NULL)
-			RTE_LOG(WARNING, EAL, "%s\n", dlerror());
-	}
+	if (eal_plugins_init() < 0)
+		rte_panic("Cannot init plugins\n");
 
 	eal_thread_init_master(rte_config.master_lcore);
 
-- 
2.5.0