[PATCH 2/2] automation: xilinx: Add GEM passthrough test

[Michal Orzel <michal.orzel@xxxxxxx>]

Being able to access a real board with real resources gives a great
opportunity to finally test passthroughing devices to guests. Therefore,
create a new Xilinx job to test GEM (Gigabit Ethernet MAC) controller
passthrough to a dom0less domU.

By passing "gem-passthrough" as a test variant, the test will instruct
the ImageBuilder to use "eth0.dtb" (passthrough dtb stored under tftp
server root) as a guest dtb and to add "xen,passthrough" dtb property to
"/amba/ethernet@ff0e0000" node. The guest itself will try to bringup
the network interface, obtain dynamically IP address and ping the default
gateway.

Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
Example job:
https://gitlab.com/xen-project/people/sstabellini/xen/-/jobs/4189922473
---
 automation/gitlab-ci/test.yaml                |  8 ++++++
 .../scripts/xilinx-smoke-dom0less-arm64.sh    | 25 +++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/automation/gitlab-ci/test.yaml b/automation/gitlab-ci/test.yaml
index d68c584269dd..3409d704a7eb 100644
--- a/automation/gitlab-ci/test.yaml
+++ b/automation/gitlab-ci/test.yaml
@@ -131,6 +131,14 @@ xilinx-smoke-dom0less-arm64-gcc:
     - *arm64-test-needs
     - alpine-3.12-gcc-arm64
 
+xilinx-smoke-dom0less-arm64-gcc-gem-passthrough:
+  extends: .xilinx-arm64
+  script:
+    - ./automation/scripts/xilinx-smoke-dom0less-arm64.sh gem-passthrough 2>&1 
| tee ${LOGFILE}
+  needs:
+    - *arm64-test-needs
+    - alpine-3.12-gcc-arm64
+
 adl-smoke-x86-64-gcc-debug:
   extends: .adl-x86-64
   script:
diff --git a/automation/scripts/xilinx-smoke-dom0less-arm64.sh 
b/automation/scripts/xilinx-smoke-dom0less-arm64.sh
index 73ba251f4cc1..075305241c8d 100755
--- a/automation/scripts/xilinx-smoke-dom0less-arm64.sh
+++ b/automation/scripts/xilinx-smoke-dom0less-arm64.sh
@@ -22,6 +22,22 @@ echo \"${passed}\"
 "
 fi
 
+if [[ "${test_variant}" == "gem-passthrough" ]]; then
+    passed="${test_variant} test passed"
+
+    # For a passthroughed GEM:
+    # - bring up the network interface
+    # - dynamically assign IP
+    # - ping the default gateway
+    domU_check="
+set -ex
+ifconfig eth0 up
+udhcpc -i eth0 -n
+ping -c 10 \$(ip route | awk '/^default/ {print \$3}')
+echo \"${passed}\"
+"
+fi
+
 # DomU
 mkdir -p rootfs
 cd rootfs
@@ -96,6 +112,15 @@ cp -f binaries/domU-rootfs.cpio.gz $TFTP/
 # export dtb to artifacts
 cp $TFTP/mpsoc_smmu.dtb .
 
+if [[ "${test_variant}" == "gem-passthrough" ]]; then
+    echo "
+    DOMU_PASSTHROUGH_DTB[0]=\"eth0.dtb\"
+    DOMU_PASSTHROUGH_PATHS[0]=\"/amba/ethernet@ff0e0000\"" >> $TFTP/config
+
+    # export passthrough dtb to artifacts
+    cp $TFTP/eth0.dtb .
+fi
+
 rm -rf imagebuilder
 git clone https://gitlab.com/ViryaOS/imagebuilder
 bash imagebuilder/scripts/uboot-script-gen -t tftp -d $TFTP/ -c $TFTP/config
-- 
2.25.1