1 files changed, 34 insertions, 0 deletions
diff --git a/src/libnm-base/nm-base.c b/src/libnm-base/nm-base.c
index fa64372f..6e164908 100644
--- a/src/libnm-base/nm-base.c
+++ b/src/libnm-base/nm-base.c
@@ -39,3 +39,37 @@ nm_dhcp_iaid_from_hexstr(const char *str, guint32 *out_value)
     NM_SET_OUT(out_value, be32toh(iaid.num));
     return TRUE;
 }
+
+/*****************************************************************************/
+
+/* nm_net_devname_infiniband:
+ * @name: the output-buffer where the value will be written. Must be
+ *   not %NULL and point to a string buffer of at least IFNAMSIZ bytes.
+ * @parent_name: the parent interface name
+ * @p_key: the partition key.
+ *
+ * Returns: the infiniband name will be written to @name and @name
+ *   is returned.
+ */
+const char *
+nm_net_devname_infiniband(char name[static NM_IFNAMSIZ], const char *parent_name, int p_key)
+{
+    g_return_val_if_fail(name, NULL);
+    g_return_val_if_fail(parent_name && parent_name[0], NULL);
+    g_return_val_if_fail(strlen(parent_name) < NM_IFNAMSIZ, NULL);
+
+    /* technically, p_key of 0x0000 and 0x8000 is not allowed either. But we don't
+     * want to assert against that in nm_net_devname_infiniband(). So be more
+     * resilient here, and accept those. */
+    g_return_val_if_fail(p_key >= 0 && p_key <= 0xffff, NULL);
+
+    nm_assert(nm_utils_ifname_valid_kernel(parent_name, NULL));
+
+    /* If parent+suffix is too long, kernel would just truncate
+     * the name. We do the same. See ipoib_vlan_add().  */
+    g_snprintf(name, NM_IFNAMSIZ, "%s.%04x", parent_name, p_key);
+
+    nm_assert(nm_utils_ifname_valid_kernel(name, NULL));
+
+    return name;
+}