alx: add a simple AR816x/AR817x device driver

This is a very simple driver, based on the original vendor
driver that Qualcomm/Atheros published/submitted previously,
but reworked to make the code saner. However, it also lost
a number of features (TSO/GSO, VLAN acceleration and multi-
queue support) in the process, as well as debugging support
features I didn't have any use for. The only thing I left
is checksum offload.

More features can obviously be added, but this seemed like
a good start for having a driver in mainline at all.

Johannes Stezenbach has verified that the driver works on
AR8161, I have a AR8171 myself. The E2200 device ID I found
on github in somebody's repository.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/atheros/Kconfig

@@ -67,4 +67,22 @@ config ATL1C
 	  To compile this driver as a module, choose M here.  The module
 	  will be called atl1c.
 
+config ALX
+	tristate "Qualcomm Atheros AR816x/AR817x support"
+	depends on PCI
+	select CRC32
+	select NET_CORE
+	select MDIO
+	help
+	  This driver supports the Qualcomm Atheros L1F ethernet adapter,
+	  i.e. the following chipsets:
+
+	  1969:1091 - AR8161 Gigabit Ethernet
+	  1969:1090 - AR8162 Fast Ethernet
+	  1969:10A1 - AR8171 Gigabit Ethernet
+	  1969:10A0 - AR8172 Fast Ethernet
+
+	  To compile this driver as a module, choose M here.  The module
+	  will be called alx.
+
 endif # NET_VENDOR_ATHEROS