svn commit: r325048 - head/sys/dev/usb/net

[Oleksandr Tymoshenko]

Author: gonzo
Date: Fri Oct 27 21:22:38 2017
New Revision: 325048
URL: https://svnweb.freebsd.org/changeset/base/325048

Log:
  Fix MAC address detection regression introduced by r324184
  
  To accomodate all variaties of Pi DTS files floating around
  we look for MAC address property either in DTS node for
  USB ethernet (if it exists) or at predefined path
  ".../usb/hub/ethernet".
  
  After r324184 smsc_fdt_find_eth_node started to return node
  with compatibility string "usb424,ec00" as an eth node.
  In imported GNU dts files this node still does not have
  MAC address related property, and therefor following check for
  "mac-address" and "local-mac-address" fails.
  
  To make this logic more robust do not just search for the node
  but also make sure it has required property, so if node with
  accepted compatibility string exists but doesn't have the
  property we fall back to looking for hardoded path mentioned above.

Modified:
  head/sys/dev/usb/net/if_smsc.c

Modified: head/sys/dev/usb/net/if_smsc.c
==============================================================================
--- head/sys/dev/usb/net/if_smsc.c	Fri Oct 27 20:21:09 2017	(r325047)
+++ head/sys/dev/usb/net/if_smsc.c	Fri Oct 27 21:22:38 2017	(r325048)
@@ -1637,6 +1637,37 @@ smsc_fdt_find_eth_node_by_path(phandle_t start)
 	return (-1);
 }
 
+/*
+ * Look through known names that can contain mac address
+ * return 0 if valid MAC address has been found
+ */
+static int
+smsc_fdt_read_mac_property(phandle_t node, unsigned char *mac)
+{
+	int len;
+
+	/* Check if there is property */
+	if ((len = OF_getproplen(node, "local-mac-address")) > 0) {
+		if (len != ETHER_ADDR_LEN)
+			return (EINVAL);
+
+		OF_getprop(node, "local-mac-address", mac,
+		    ETHER_ADDR_LEN);
+		return (0);
+	}
+
+	if ((len = OF_getproplen(node, "mac-address")) > 0) {
+		if (len != ETHER_ADDR_LEN)
+			return (EINVAL);
+
+		OF_getprop(node, "mac-address", mac,
+		    ETHER_ADDR_LEN);
+		return (0);
+	}
+
+	return (ENXIO);
+}
+
 /**
  * Get MAC address from FDT blob.  Firmware or loader should fill
  * mac-address or local-mac-address property.  Returns 0 if MAC address
@@ -1646,37 +1677,22 @@ static int
 smsc_fdt_find_mac(unsigned char *mac)
 {
 	phandle_t node, root;
-	int len;
 
 	root = OF_finddevice("/");
 	node = smsc_fdt_find_eth_node(root);
+	if (node != -1) {
+		if (smsc_fdt_read_mac_property(node, mac) == 0)
+			return (0);
+	}
+
 	/*
 	 * If it's not FreeBSD FDT blob for RPi, try more
 	 *     generic .../usb/hub/ethernet
 	 */
-	if (node == -1)
-		node = smsc_fdt_find_eth_node_by_path(root);
+	node = smsc_fdt_find_eth_node_by_path(root);
 
-	if (node != -1) {
-		/* Check if there is property */
-		if ((len = OF_getproplen(node, "local-mac-address")) > 0) {
-			if (len != ETHER_ADDR_LEN)
-				return (EINVAL);
-
-			OF_getprop(node, "local-mac-address", mac,
-			    ETHER_ADDR_LEN);
-			return (0);
-		}
-
-		if ((len = OF_getproplen(node, "mac-address")) > 0) {
-			if (len != ETHER_ADDR_LEN)
-				return (EINVAL);
-
-			OF_getprop(node, "mac-address", mac,
-			    ETHER_ADDR_LEN);
-			return (0);
-		}
-	}
+	if (node != -1)
+		return smsc_fdt_read_mac_property(node, mac);
 
 	return (ENXIO);
 }