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[libvirt] [PATCH 1/3 RFC] Add function to get the network interface name of a pci device



From: Roopa Prabhu <roprabhu cisco com>

This function looks at sysfs "net" directory to get the network interface
name associated with the pci device

Signed-off-by: Roopa Prabhu <roprabhu cisco com>
Signed-off-by: Christian Benvenuti <benve cisco com>
Signed-off-by: David Wang <dwang2 cisco com>
---
 src/util/pci.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 src/util/pci.h |    2 ++
 2 files changed, 44 insertions(+), 0 deletions(-)


diff --git a/src/util/pci.c b/src/util/pci.c
index a79c164..d2deeef 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1679,3 +1679,45 @@ int pciDeviceIsAssignable(pciDevice *dev,
 
     return 1;
 }
+
+/*
+ * This function returns the network device name
+ * of a pci device
+ */
+int
+pciDeviceGetNetName(char *device_link_sysfs_path, char **netname)
+{
+        char *pcidev_sysfs_net_path = NULL;
+        int ret = -1;
+        DIR *dir = NULL;
+        struct dirent *entry = NULL;
+
+        if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
+            "net") == -1) {
+            virReportOOMError();
+            return -1;
+        }
+
+        dir = opendir(pcidev_sysfs_net_path);
+        if (dir == NULL)
+            goto out;
+
+        while ((entry = readdir(dir))) {
+               if (entry->d_name[0] == '.' ||
+                   !strcmp(entry->d_name, ".."))
+                   continue;
+
+               /* Assume a single directory entry */
+               *netname = strdup(entry->d_name);
+               ret = 0;
+               break;
+        }
+
+        if (dir)
+            closedir(dir);
+
+out:
+        VIR_FREE(pcidev_sysfs_net_path);
+
+        return ret;
+}
diff --git a/src/util/pci.h b/src/util/pci.h
index a351baf..fa25472 100644
--- a/src/util/pci.h
+++ b/src/util/pci.h
@@ -74,4 +74,6 @@ int pciDeviceIsAssignable(pciDevice *dev,
                           int strict_acs_check);
 int pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher);
 
+int pciDeviceGetNetName(char *device_link_sysfs_path, char **netname);
+
 #endif /* __VIR_PCI_H__ */


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