meta-ampere: usbnet: implement using usb-ctrl

Change to implement virtual USB Ethernet using phosphor-misc's usb-ctrl.

Tested:
1. Boot BMC to Linux. Login and check if usb0 ethernet interface exists.
2. Power ON the Host. Check if usb0 automatically sets its IP to
192.168.0.10
3. Restart the ampere-usbnet.service service. Check if no error happens.

Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I4de722a691a112db851b6dda0a7821b9f78b4d72

4 files changed, 68 insertions, 0 deletions

diff --git a/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet.bb b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet.bb
new file mode 100644
index 000000000..d1dff35ec
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet.bb
@@ -0,0 +1,28 @@
+SUMMARY = "Enable USB ethernet"
+PR = "r1"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+DEPENDS += "systemd"
+RDEPENDS:${PN} += "libsystemd bash"
+
+inherit allarch systemd
+
+SRC_URI += "file://ampere-usbnet.service \
+            file://ampere_usbnet.sh \
+            file://00-bmc-usb0.network"
+
+do_install() {
+    install -d ${D}${systemd_unitdir}/system/
+    install -m 0644 ${WORKDIR}/ampere-usbnet.service ${D}${systemd_unitdir}/system
+
+    install -d ${D}${sysconfdir_native}/systemd/network/
+    install -m 0644 ${WORKDIR}/00-bmc-usb0.network ${D}${sysconfdir_native}/systemd/network
+
+    install -d ${D}/${sbindir}
+    install -m 755 ${WORKDIR}/ampere_usbnet.sh ${D}/${sbindir}
+}
+
+NATIVE_SYSTEMD_SUPPORT = "1"
+SYSTEMD_PACKAGES = "${PN}"
+SYSTEMD_SERVICE:${PN} = "ampere-usbnet.service"
diff --git a/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/00-bmc-usb0.network b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/00-bmc-usb0.network
new file mode 100644
index 000000000..640fe04b9
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/00-bmc-usb0.network
@@ -0,0 +1,7 @@
+[Match]
+Name=usb0
+[Address]
+Address=192.168.0.10/16
+[Network]
+LinkLocalAddressing=no
+IPv6AcceptRA=no
diff --git a/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere-usbnet.service b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere-usbnet.service
new file mode 100644
index 000000000..349954325
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere-usbnet.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Ampere Ethernet over USB gadget device
+After=phosphor-ipmi-host.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/sbin/ampere_usbnet.sh
+ExecStop=/usr/bin/usb-ctrl ecm usbnet off
+
+[Install]
+WantedBy=multi-user.target
diff --git a/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere_usbnet.sh b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere_usbnet.sh
new file mode 100644
index 000000000..fd2dce610
--- /dev/null
+++ b/meta-ampere/meta-common/recipes-phosphor/network/ampere-usbnet/ampere_usbnet.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+ENV_MAC_ADDR=$(fw_printenv eth1addr)
+if [ -z "$ENV_MAC_ADDR" ]; then
+	ENV_MAC_ADDR=$(fw_printenv ethaddr)
+fi
+
+MAC_ADDR=$(echo "$ENV_MAC_ADDR" | cut -d "=" -f 2)
+
+if [ -n "$MAC_ADDR" ]; then
+	# Generate MAC Address from eth1addr using locally administered MAC
+	# https://en.wikipedia.org/wiki/MAC_address#Universal_vs._local_(U/L_bit
+	SUBMAC=$(echo "$MAC_ADDR" | cut -d ":" -f 2-6)
+	/usr/bin/usb-ctrl ecm usbnet on "06:$SUBMAC" "02:$SUBMAC"
+else
+	/usr/bin/usb-ctrl ecm usbnet on
+fi
+
+# Use NCM (Ethernet) Gadget instead of FunctionFS Gadget
+echo 0x0103 > /sys/kernel/config/usb_gadget/usbnet/idProduct
+echo "OpenBMC usbnet Device" > /sys/kernel/config/usb_gadget/usbnet/strings/0x409/product