[dpdk-dev] [PATCH v2 2/2] eal/linux: Add support for handling built-in kernel modules

[Kamil Rytarowski <Kamil.Rytarowski@caviumnetworks.com>]

Currently rte_eal_check_module() detects Linux kernel modules via reading
/proc/modules. Built-in ones aren't listed there and therefore they are not
being found by the script.

Add support for checking built-in modules with parsing the sysfs files

Signed-off-by: Kamil Rytarowski <Kamil.Rytarowski@caviumnetworks.com>
---
 lib/librte_eal/linuxapp/eal/eal.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 635ec36..6cab906 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -52,6 +52,8 @@
 #if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686)
 #include <sys/io.h>
 #endif
+#include <sys/types.h>
+#include <sys/stat.h>
 
 #include <rte_common.h>
 #include <rte_debug.h>
@@ -902,7 +904,10 @@ int
 rte_eal_check_module(const char *module_name)
 {
 	char mod_name[30]; /* Any module names can be longer than 30 bytes? */
+	char sysfs_mod_name[PATH_MAX];
+	struct stat st;
 	int ret = 0;
+	int rv;
 	int n;
 
 	if (NULL == module_name)
@@ -918,9 +923,23 @@ rte_eal_check_module(const char *module_name)
 		n = fscanf(fd, "%29s %*[^\n]", mod_name);
 		if ((n == 1) && !strcmp(mod_name, module_name)) {
 			ret = 1;
-			break;
+			goto finish;
 		}
 	}
+	RTE_LOG(DEBUG, EAL, "Module %s not found in /proc/modules",
+	        module_name);
+
+	/* A module might be builtin, try sysfs */
+	snprintf(sysfs_mod_name, PATH_MAX, "/sys/module/%s", module_name);
+	if ((rv = stat(sysfs_mod_name, &st)) == 0) {
+		ret = 1;
+		goto finish;
+	}
+
+	RTE_LOG(DEBUG, EAL, "Open %s failed! error %i (%s)\n",
+	        sysfs_mod_name, errno, strerror(errno));
+
+finish:
 	fclose(fd);
 
 	return ret;
-- 
2.5.0