ethtool: Add WAKE_FILTER and RX_CLS_FLOW_WAKE

Add the ability to specify through ethtool::rxnfc that a rule location is
special and will be used to participate in Wake-on-LAN, by e.g: having a
specific pattern be matched. When this is the case, fs->ring_cookie must
be set to the special value RX_CLS_FLOW_WAKE.

We also define an additional ethtool::wolinfo flag: WAKE_FILTER which
can be used to configure an Ethernet adapter to allow Wake-on-LAN using
previously programmed filters.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/ethtool.h

@@ -870,7 +870,8 @@ struct ethtool_flow_ext {
  *	includes the %FLOW_EXT or %FLOW_MAC_EXT flag
  *	(see &struct ethtool_flow_ext description).
  * @ring_cookie: RX ring/queue index to deliver to, or %RX_CLS_FLOW_DISC
- *	if packets should be discarded
+ *	if packets should be discarded, or %RX_CLS_FLOW_WAKE if the
+ *	packets should be used for Wake-on-LAN with %WAKE_FILTER
  * @location: Location of rule in the table.  Locations must be
  *	numbered such that a flow matching multiple rules will be
  *	classified according to the first (lowest numbered) rule.
@@ -1634,6 +1635,7 @@ static inline int ethtool_validate_duplex(__u8 duplex)
 #define WAKE_ARP		(1 << 4)
 #define WAKE_MAGIC		(1 << 5)
 #define WAKE_MAGICSECURE	(1 << 6) /* only meaningful if WAKE_MAGIC */
+#define WAKE_FILTER		(1 << 7)
 
 /* L2-L4 network traffic flow types */
 #define	TCP_V4_FLOW	0x01	/* hash or spec (tcp_ip4_spec) */
@@ -1671,6 +1673,7 @@ static inline int ethtool_validate_duplex(__u8 duplex)
 #define	RXH_DISCARD	(1 << 31)
 
 #define	RX_CLS_FLOW_DISC	0xffffffffffffffffULL
+#define RX_CLS_FLOW_WAKE	0xfffffffffffffffeULL
 
 /* Special RX classification rule insert location values */
 #define RX_CLS_LOC_SPECIAL	0x80000000	/* flag */