CI: Add test for different network devices

To support future development, tests are added for different network
devices. ICMP packet transmission is used to verify link functionality
between virtio-net and other network devices, such as TAP.

.ci/test-netdev.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+
+function cleanup {
+    sleep 1
+    pkill -9 semu
+}
+
+function ASSERT {
+    $*
+    local RES=$?
+    if [ $RES -ne 0 ]; then
+        echo 'Assert failed: "' $* '"'
+        exit $RES
+    fi
+}
+
+cleanup
+
+# macOS needs more time to boot compared to Linux, so the timeout is set to
+# 600 seconds for macOS to handle the longer startup. For Linux, 90 seconds
+# is sufficient due to its faster boot process.
+UNAME_S=$(uname -s)
+if [[ ${UNAME_S} == "Darwin" ]]; then
+    TIMEOUT=600
+else # Linux
+    TIMEOUT=30
+fi
+
+function TEST_NETDEV {
+    local NETDEV=$1
+    local CMD_PREFIX=""
+
+    if [ $NETDEV == tap ]; then
+        CMD_PREFIX="sudo "
+    fi
+
+ASSERT expect <<DONE
+    set timeout ${TIMEOUT}
+    spawn ${CMD_PREFIX}make check NETDEV=${NETDEV}
+    expect "buildroot login:" { send "root\n" } timeout { exit 1 }
+    expect "# " { send "uname -a\n" } timeout { exit 2 }
+    if { "$NETDEV" == "tap" } {
+        exec sudo ip addr add 192.168.10.1/24 dev tap0
+        exec sudo ip link set tap0 up
+        expect "riscv32 GNU/Linux" { send "ip l set eth0 up\n" } timeout { exit 3 }
+        expect "# " { send "ip a add 192.168.10.2/24 dev eth0\n" }
+        expect "# " { send "ping -c 3 192.168.10.1\n" }
+        expect "3 packets transmitted, 3 packets received, 0% packet loss" { } timeout { exit 4 }    
+    } elseif { "$NETDEV" == "user" } {
+        # Test slirp configuration
+        expect "riscv32 GNU/Linux" { send "\x01"; send "x" } timeout { exit 3 }
+    }
+DONE
+}
+
+# Network devices
+NETWORK_DEVICES=(tap user)
+
+for NETDEV in "${NETWORK_DEVICES[@]}"; do
+    cleanup
+    echo "Test network device: $NETDEV"
+    TEST_NETDEV $NETDEV
+done
+
+ret=$?
+cleanup
+
+MESSAGES=("OK!" \
+     "Fail to boot" \
+     "Fail to login" \
+     "Fail to run commands" \
+     "Fail to transfer packet" \
+)
+
+COLOR_G='\e[32;01m' # Green
+COLOR_N='\e[0m'
+printf "\n[ ${COLOR_G}${MESSAGES[$ret]}${COLOR_N} ]\n"
+
+exit ${ret}

.github/workflows/main.yml

@@ -16,6 +16,10 @@ jobs:
     - name: automated test
       run: .ci/autorun.sh
       shell: bash
+    - name: netdev test
+      run: .ci/test-netdev.sh
+      shell: bash
+      if: ${{ success() }}
 
   semu-macOS:
     runs-on: macos-latest