[PATCH v3 16/16] tests/functional/aarch64: add raspi4b GENET networking test

[Marcelo Manzo <marcelomanzo@gmail.com>]

Add test_arm_raspi4_genet, exercising the raspi4b GENET controller
end to end: boot with a -nic bcm2838-genet device attached, confirm
the guest driver probes it ("GENET 5.0 EPHY" in the kernel log),
reach a shell, and confirm the link actually comes up
("ip link show eth0" reports LOWER_UP) rather than just that the
device exists.

Verified locally against this series with the exact kernel/initrd
assets this file already pins (raspberrypi-kernel_1.20230106-1 /
groeck linux-build-test rootfs). The link only comes up because the
MDIO patch handles the PHY autonegotiation-restart request (BMCR
ANRESTART) correctly; without that the link never comes up and this
test would hang at the "ip link show eth0" step, so it also serves
as a regression test for it.

Signed-off-by: Marcelo Manzo <marcelomanzo@gmail.com>
---
 tests/functional/aarch64/test_raspi4.py | 30 +++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tests/functional/aarch64/test_raspi4.py b/tests/functional/aarch64/test_raspi4.py
index bacecbbe9c..f703fc69ae 100755
--- a/tests/functional/aarch64/test_raspi4.py
+++ b/tests/functional/aarch64/test_raspi4.py
@@ -109,5 +109,35 @@ def test_arm_raspi4_initrd(self):
         #self.vm.wait()
 
 
+    def test_arm_raspi4_genet(self):
+        kernel_path = self.archive_extract(self.ASSET_KERNEL_20190215,
+                                           member='boot/kernel8.img')
+        dtb_path = self.archive_extract(self.ASSET_KERNEL_20190215,
+                                        member='boot/bcm2711-rpi-4-b.dtb')
+        initrd_path = self.uncompress(self.ASSET_INITRD)
+
+        self.set_machine('raspi4b')
+        self.vm.set_console()
+        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
+                               'earlycon=pl011,mmio32,0xfe201000 ' +
+                               'console=ttyAMA0,115200 ' +
+                               'panic=-1 noreboot ' +
+                               'dwc_otg.fiq_fsm_enable=0')
+        self.vm.add_args('-kernel', kernel_path,
+                         '-dtb', dtb_path,
+                         '-initrd', initrd_path,
+                         '-append', kernel_command_line,
+                         '-no-reboot',
+                         '-nic', 'user,model=bcm2838-genet')
+        self.vm.launch()
+        self.wait_for_console_pattern(
+            'bcmgenet fd580000.ethernet: GENET 5.0 EPHY')
+        self.wait_for_console_pattern('Boot successful.')
+
+        exec_command_and_wait_for_pattern(self, 'ip link show eth0',
+                                                'LOWER_UP')
+        exec_command_and_wait_for_pattern(self, 'halt', 'reboot: System halted')
+
+
 if __name__ == '__main__':
     LinuxKernelTest.main()
-- 
2.55.0