x86: add support for AWS T3 instances

Amazon AWS T3 cloud instances require kernel support
for the Elastic Fabric Adapter to access storage
and for Elastic Network Adapter to use network
interfaces.

Since the Fabric Adapter is needed to access
root filesystem, enable in x86_64 kernel.

Elastic Network Adapter goes in a module,
and add this module to default list in x86_64.
The module is set to AutoLoad because AutoProbe does
not seem to load it.

Signed-off-by: Alberto Bursi <[email protected]>

target/linux/x86/64/config-5.4

@@ -253,6 +253,7 @@ CONFIG_I2C_BOARDINFO=y
 # CONFIG_I2C_MULTI_INSTANTIATE is not set
 # CONFIG_IA32_EMULATION is not set
 CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
+CONFIG_INFINIBAND_EFA=y
 CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
 CONFIG_INTEL_GTT=y
 CONFIG_INTEL_IDLE=y

target/linux/x86/image/64.mk

@@ -1,7 +1,7 @@
 define Device/generic
   DEVICE_TITLE := Generic x86/64
-  DEVICE_PACKAGES += kmod-bnx2 kmod-e1000e kmod-e1000 kmod-forcedeth kmod-igb \
-	kmod-ixgbe kmod-r8169
+  DEVICE_PACKAGES += kmod-amazon-ena kmod-bnx2 kmod-e1000e kmod-e1000 \
+	kmod-forcedeth kmod-igb kmod-ixgbe kmod-r8169
   GRUB2_VARIANT := generic
 endef
 TARGET_DEVICES += generic

target/linux/x86/modules.mk

@@ -2,6 +2,23 @@
 #
 # Copyright (C) 2017 Cezary Jackiewicz <[email protected]>
 
+define KernelPackage/amazon-ena
+  SUBMENU:=$(NETWORK_DEVICES_MENU)
+  TITLE:=Elastic Network Adapter (for Amazon AWS T3)
+  DEPENDS:=@TARGET_x86_64
+  KCONFIG:=CONFIG_ENA_ETHERNET
+  FILES:=$(LINUX_DIR)/drivers/net/ethernet/amazon/ena/ena.ko
+  AUTOLOAD:=$(call AutoLoad,12,ena)
+endef
+
+define KernelPackage/amazon-ena/description
+  This driver supports Elastic Network Adapter (ENA)
+  used by Amazon AWS T3 instances.
+endef
+
+$(eval $(call KernelPackage,amazon-ena))
+
+
 define KernelPackage/sound-cs5535audio
   TITLE:=CS5535/CS5536 Audio Controller
   DEPENDS:=@TARGET_x86_geode +kmod-ac97