swconfig: add SWITCH_TYPE_LINK and support sending link info to user space

So far we were sending link data as a string. It got some drawbacks:
1) Didn't allow writing clean user space apps reading link state. It was
   needed to do some screen scraping.
2) Forced whole PORT_LINK communication to be string based. Adding
   support for *setting* port link required passing string and parting
   it in the kernel space.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 47997

target/linux/generic/files/include/uapi/linux/switch.h

@@ -50,6 +50,7 @@ enum {
 	SWITCH_ATTR_OP_VALUE_INT,
 	SWITCH_ATTR_OP_VALUE_STR,
 	SWITCH_ATTR_OP_VALUE_PORTS,
+	SWITCH_ATTR_OP_VALUE_LINK,
 	SWITCH_ATTR_OP_DESCRIPTION,
 	/* port lists */
 	SWITCH_ATTR_PORT,
@@ -86,6 +87,7 @@ enum switch_val_type {
 	SWITCH_TYPE_INT,
 	SWITCH_TYPE_STRING,
 	SWITCH_TYPE_PORTS,
+	SWITCH_TYPE_LINK,
 	SWITCH_TYPE_NOVAL,
 };
 
@@ -97,6 +99,20 @@ enum {
 	SWITCH_PORT_ATTR_MAX
 };
 
+/* link nested attributes */
+enum {
+	SWITCH_LINK_UNSPEC,
+	SWITCH_LINK_FLAG_LINK,
+	SWITCH_LINK_FLAG_DUPLEX,
+	SWITCH_LINK_FLAG_ANEG,
+	SWITCH_LINK_FLAG_TX_FLOW,
+	SWITCH_LINK_FLAG_RX_FLOW,
+	SWITCH_LINK_SPEED,
+	SWITCH_LINK_FLAG_EEE_100BASET,
+	SWITCH_LINK_FLAG_EEE_1000BASET,
+	SWITCH_LINK_ATTR_MAX,
+};
+
 #define SWITCH_ATTR_DEFAULTS_OFFSET	0x1000