eth: fealnx: bring back this old driver

This reverts commit d5e2d038db.

We have a report of this chip being used on a

  SURECOM EP-320X-S 100/10M Ethernet PCI Adapter

which could still have been purchased in some parts
of the world 3 years ago.

Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217151
Fixes: d5e2d038db ("eth: fealnx: delete the driver for Myson MTD-800")
Link: https://lore.kernel.org/r/20230307171930.4008454-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

arch/mips/configs/mtx1_defconfig

@@ -284,6 +284,7 @@ CONFIG_IXGB=m
 CONFIG_SKGE=m
 CONFIG_SKY2=m
 CONFIG_MYRI10GE=m
+CONFIG_FEALNX=m
 CONFIG_NATSEMI=m
 CONFIG_NS83820=m
 CONFIG_S2IO=m

arch/powerpc/configs/ppc6xx_defconfig

@@ -461,6 +461,7 @@ CONFIG_MV643XX_ETH=m
 CONFIG_SKGE=m
 CONFIG_SKY2=m
 CONFIG_MYRI10GE=m
+CONFIG_FEALNX=m
 CONFIG_NATSEMI=m
 CONFIG_NS83820=m
 CONFIG_PCMCIA_AXNET=m

drivers/net/ethernet/Kconfig

@@ -132,6 +132,16 @@ source "drivers/net/ethernet/mscc/Kconfig"
 source "drivers/net/ethernet/microsoft/Kconfig"
 source "drivers/net/ethernet/moxa/Kconfig"
 source "drivers/net/ethernet/myricom/Kconfig"
+
+config FEALNX
+	tristate "Myson MTD-8xx PCI Ethernet support"
+	depends on PCI
+	select CRC32
+	select MII
+	help
+	  Say Y here to support the Myson MTD-800 family of PCI-based Ethernet
+	  cards. <http://www.myson.com.tw/>
+
 source "drivers/net/ethernet/ni/Kconfig"
 source "drivers/net/ethernet/natsemi/Kconfig"
 source "drivers/net/ethernet/neterion/Kconfig"

drivers/net/ethernet/Makefile

@@ -64,6 +64,7 @@ obj-$(CONFIG_NET_VENDOR_MICROCHIP) += microchip/
 obj-$(CONFIG_NET_VENDOR_MICROSEMI) += mscc/
 obj-$(CONFIG_NET_VENDOR_MOXART) += moxa/
 obj-$(CONFIG_NET_VENDOR_MYRI) += myricom/
+obj-$(CONFIG_FEALNX) += fealnx.o
 obj-$(CONFIG_NET_VENDOR_NATSEMI) += natsemi/
 obj-$(CONFIG_NET_VENDOR_NETERION) += neterion/
 obj-$(CONFIG_NET_VENDOR_NETRONOME) += netronome/