[PATCH v4 1/2] tools: Add support for handling built-in kernel modules

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

Currently dpdk_nic_bind.py 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.

This commit obsoletes the /proc/modules parsing approach.

Signed-off-by: Kamil Rytarowski <Kamil.Rytarowski@caviumnetworks.com>
Signed-off-by: David Marchand <david.marchand@6wind.com>
---
 tools/dpdk_nic_bind.py | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/tools/dpdk_nic_bind.py b/tools/dpdk_nic_bind.py
index f02454e..e161062 100755
--- a/tools/dpdk_nic_bind.py
+++ b/tools/dpdk_nic_bind.py
@@ -156,22 +156,29 @@ def check_modules():
     '''Checks that igb_uio is loaded'''
     global dpdk_drivers
 
-    fd = file("/proc/modules")
-    loaded_mods = fd.readlines()
-    fd.close()
-
     # list of supported modules
     mods =  [{"Name" : driver, "Found" : False} for driver in dpdk_drivers]
 
     # first check if module is loaded
-    for line in loaded_mods:
+    try:
+        # Get list of syfs modules, some of them might be builtin and merge with mods
+        sysfs_path = '/sys/module/'
+
+        # Get the list of directories in sysfs_path
+        sysfs_mods = [os.path.join(sysfs_path,o) for o in os.listdir(sysfs_path) if os.path.isdir(os.path.join(sysfs_path,o))]
+
+        # Extract the last element of '/sys/module/abc' in the array
+        sysfs_mods = [a.split('/')[-1] for a in sysfs_mods]
+
+        # special case for vfio_pci (module is named vfio-pci,
+        # but its .ko is named vfio_pci)
+        sysfs_mods = map(lambda a: a if a != 'vfio_pci' else 'vfio-pci', sysfs_mods)
+
         for mod in mods:
-            if line.startswith(mod["Name"]):
-                mod["Found"] = True
-            # special case for vfio_pci (module is named vfio-pci,
-            # but its .ko is named vfio_pci)
-            elif line.replace("_", "-").startswith(mod["Name"]):
+            if mod["Found"] == False and (mod["Name"] in sysfs_mods):
                 mod["Found"] = True
+    except:
+        pass
 
     # check if we have at least one loaded module
     if True not in [mod["Found"] for mod in mods] and b_flag is not None:
-- 
1.9.1