net: ethernet: stmmac: Add uio support for stmmac

Currently only supports single channel, and the network card
name needs to be eth0 and eth1.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Change-Id: I19975b10e2ed12931edc2e8bd50c003416a1109c

drivers/net/ethernet/stmicro/stmmac/Kconfig

@@ -25,6 +25,13 @@ config STMMAC_SELFTESTS
 	  feature if you are facing problems with your HW and submit the test
 	  results to the netdev Mailing List.
 
+config STMMAC_UIO
+	tristate "STMMAC_UIO ethernet controller"
+	default n
+	select UIO
+	help
+	  Say M here if you want to use the stmmac_uio.ko for DPDK.
+
 config STMMAC_ETHTOOL
 	bool "Ethtool feature for STMMAC"
 	default STMMAC_ETH if !ROCKCHIP_MINI_KERNEL

drivers/net/ethernet/stmicro/stmmac/Makefile

@@ -27,6 +27,7 @@ obj-$(CONFIG_DWMAC_QCOM_ETHQOS)	+= dwmac-qcom-ethqos.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rockchip.o
 dwmac-rockchip-objs := dwmac-rk.o
 dwmac-rockchip-$(CONFIG_DWMAC_ROCKCHIP_TOOL) += dwmac-rk-tool.o
+obj-$(CONFIG_STMMAC_UIO) += stmmac_uio.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
 obj-$(CONFIG_DWMAC_STM32)	+= dwmac-stm32.o

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -48,10 +48,18 @@
  */
 #define DMA_MIN_TX_SIZE		64
 #define DMA_MAX_TX_SIZE		1024
+#if IS_ENABLED(CONFIG_STMMAC_UIO)
+#define DMA_DEFAULT_TX_SIZE	1024
+#else
 #define DMA_DEFAULT_TX_SIZE	512
+#endif
 #define DMA_MIN_RX_SIZE		64
 #define DMA_MAX_RX_SIZE		1024
+#if IS_ENABLED(CONFIG_STMMAC_UIO)
+#define DMA_DEFAULT_RX_SIZE	1024
+#else
 #define DMA_DEFAULT_RX_SIZE	512
+#endif
 #define STMMAC_GET_ENTRY(x, size)	((x + 1) & (size - 1))
 
 #undef FRAME_FILTER_DEBUG

drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

@@ -396,6 +396,7 @@ int stmmac_mdio_reset(struct mii_bus *bus)
 #endif
 	return 0;
 }
+EXPORT_SYMBOL(stmmac_mdio_reset);
 
 /**
  * stmmac_mdio_register