Add case to support jumbo frame test

Automate VIRT-95907 Jumbo Frame

Signed-off-by: Lei Yang <leiyang@redhat.com>

Author: yanglei-rh

libvirt/tests/cfg/virtual_network/qemu/jumbo.cfg

@@ -0,0 +1,13 @@
+- virtual_network.qemu_test.jumbo: image_copy
+    requires_root = yes
+    create_vm_libvirt = yes
+    master_images_clone = img1
+    kill_vm_libvirt = yes
+    type = jumbo
+    start_vm = no
+    mtu = 9000
+    e1000e:
+        only Linux
+    virtio_net:
+        Windows:
+            mtu_key = MTU

libvirt/tests/src/virtual_network/qemu/jumbo.py

@@ -0,0 +1,221 @@
+import random
+import re
+
+from avocado.utils import process
+from virttest import (
+    env_process,
+    error_context,
+    utils_misc,
+    utils_net,
+    utils_test,
+)
+from virttest.utils_test import libvirt
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Test the RX jumbo frame function of vnics:
+
+    1) Boot the VM.
+    2) Change the MTU of guest nics and host taps depending on the NIC model.
+    3) Add the static ARP entry for guest NIC.
+    4) Wait for the MTU ok.
+    5) Verify the path MTU using ping.
+    6) Ping the guest with large frames.
+    7) Increment size ping.
+    8) Flood ping the guest with large frames.
+    9) Verify the path MTU.
+    10) Recover the MTU.
+
+    :param test: LIBVIRT test object.
+    :param params: Dictionary with the test parameters.
+    :param env: Dictionary with test environment.
+    """
+
+    def get_ovs_ports(ovs):
+        """
+        get the ovs bridge all Interface list.
+
+        :param ovs: Ovs bridge name
+        """
+        cmd = "ovs-vsctl list-ports %s" % ovs
+        return process.getoutput(cmd, shell=True)
+
+    netdst = params.get("netdst", "switch")
+    host_bridges = utils_net.find_bridge_manager(netdst)
+    if not isinstance(host_bridges, utils_net.Bridge):
+        host_hw_interface = get_ovs_ports(netdst)
+        tmp_ports = re.findall(r"t[0-9]{1,}-[a-zA-Z0-9]{6}", host_hw_interface)
+        if tmp_ports:
+            for p in tmp_ports:
+                process.system_output("ovs-vsctl del-port %s %s" % (netdst, p))
+
+    params["start_vm"] = "yes"
+    env_process.preprocess_vm(test, params, env, params["main_vm"])
+
+    timeout = params.get_numeric("login_timeout", 360)
+    mtu_default = 1500
+    mtu = params.get_numeric("mtu", "1500")
+    def_max_icmp_size = int(mtu) - 28
+    max_icmp_pkt_size = params.get_numeric("max_icmp_pkt_size", def_max_icmp_size)
+    flood_time = params.get_numeric("flood_time", "300")
+    os_type = params.get("os_type")
+    hint = params.get("hint", "do")
+
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login(timeout=timeout)
+    session_serial = vm.wait_for_serial_login(timeout=timeout)
+
+    iface_mac = vm.get_mac_address(0)
+    vm_name = params.get("main_vm")
+    ifname = libvirt.get_ifname_host(vm_name, iface_mac)
+    guest_ip = vm.get_address(0)
+    if guest_ip is None:
+        test.error("Could not get the guest ip address")
+
+    host_mtu_cmd = "ip link set dev %s mtu %s"
+    if not isinstance(host_bridges, utils_net.Bridge):
+        target_ifaces = set(get_ovs_ports(netdst).splitlines())
+    else:
+        br_in_use = host_bridges.list_br()
+        ifaces_in_use = host_bridges.list_iface()
+        target_ifaces = set(ifaces_in_use) - set(br_in_use)
+
+    error_context.context("Change all Bridge NICs MTU to %s" % mtu, test.log.info)
+    for iface in target_ifaces:
+        process.run(host_mtu_cmd % (iface, mtu), shell=True)
+
+    try:
+        error_context.context("Changing the MTU of guest", test.log.info)
+        # Environment preparation
+        if os_type == "linux":
+            ethname = utils_net.get_linux_ifname(session, iface_mac)
+            guest_mtu_cmd = "ip link set dev %s mtu %s" % (ethname, mtu)
+        else:
+            connection_id = utils_net.get_windows_nic_attribute(
+                session, "macaddress", iface_mac, "netconnectionid"
+            )
+
+            index = utils_net.get_windows_nic_attribute(
+                session, "netconnectionid", connection_id, "index"
+            )
+
+            reg_set_mtu_pattern = params.get("reg_mtu_cmd")
+            mtu_key_word = params.get("mtu_key", "MTU")
+            reg_set_mtu = reg_set_mtu_pattern % (int(index), mtu_key_word, int(mtu))
+            guest_mtu_cmd = "%s " % reg_set_mtu
+
+        session.cmd(guest_mtu_cmd)
+        if os_type == "windows":
+            mode = "netsh"
+            utils_net.restart_windows_guest_network(
+                session_serial, connection_id, mode=mode
+            )
+
+        error_context.context("Changing the MTU of host tap ...", test.log.info)
+        process.run(host_mtu_cmd % (ifname, mtu), shell=True)
+
+        error_context.context("Add a temporary static ARP entry ...", test.log.info)
+        arp_add_cmd = "arp -s %s %s -i %s" % (guest_ip, iface_mac, ifname)
+        process.run(arp_add_cmd, shell=True)
+
+        def is_mtu_ok():
+            status, _ = utils_test.ping(
+                guest_ip, 1, packetsize=max_icmp_pkt_size, hint="do", timeout=2
+            )
+            return status == 0
+
+        def verify_mtu():
+            test.log.info("Verify the path MTU")
+            status, output = utils_test.ping(
+                guest_ip, 10, packetsize=max_icmp_pkt_size, hint="do", timeout=15
+            )
+            if status != 0:
+                test.log.error(output)
+                test.fail("Path MTU is not as expected")
+            if utils_test.get_loss_ratio(output) != 0:
+                test.log.error(output)
+                test.fail("Packet loss ratio during MTU verification is not zero")
+
+        def flood_ping():
+            test.log.info("Flood with large frames")
+            utils_test.ping(
+                guest_ip,
+                packetsize=max_icmp_pkt_size,
+                flood=True,
+                timeout=float(flood_time),
+            )
+
+        def large_frame_ping(count=100):
+            test.log.info("Large frame ping")
+            _, output = utils_test.ping(
+                guest_ip, count, packetsize=max_icmp_pkt_size, timeout=float(count) * 2
+            )
+            ratio = utils_test.get_loss_ratio(output)
+            if ratio != 0:
+                test.fail("Loss ratio of large frame ping is %s" % ratio)
+
+        def size_increase_ping(step=None):
+            test.log.info("Size increase ping")
+            if step is None:
+                step = random.randrange(90, 110)
+            for size in range(0, max_icmp_pkt_size + 1, step):
+                test.log.info("Ping %s with size %s", guest_ip, size)
+                status, output = utils_test.ping(
+                    guest_ip, 1, packetsize=size, hint=hint, timeout=1
+                )
+                if status != 0:
+                    status, output = utils_test.ping(
+                        guest_ip,
+                        10,
+                        packetsize=size,
+                        adaptive=True,
+                        hint=hint,
+                        timeout=20,
+                    )
+
+                    fail_ratio = params.get_numeric("fail_ratio", 50)
+                    loss = utils_test.get_loss_ratio(output)
+                    if loss > fail_ratio:
+                        test.fail(
+                            "Ping loss ratio %s is greater than %s%% for size %s"
+                            % (loss, fail_ratio, size)
+                        )
+
+        test.log.info("Waiting for the MTU to be OK")
+        wait_mtu_ok = 20
+        if not utils_misc.wait_for(is_mtu_ok, wait_mtu_ok, 0, 1):
+            test.log.debug(
+                process.getoutput(
+                    "ifconfig -a", verbose=False, ignore_status=True, shell=True
+                )
+            )
+            test.error("MTU is not as expected even after %s seconds" % wait_mtu_ok)
+
+        # Functional Test
+        error_context.context("Checking whether MTU change is ok", test.log.info)
+
+        verify_mtu()
+        large_frame_ping()
+        size_increase_ping()
+
+        # Stress test
+        flood_ping()
+        verify_mtu()
+
+    finally:
+        # Environment clean
+        if session:
+            session.close()
+        if 'session_serial' in locals() and session_serial:
+            session_serial.close()
+        grep_cmd = "grep '%s.*%s' /proc/net/arp" % (guest_ip, ifname)
+        if process.system(grep_cmd, shell=True) == 0:
+            process.run("arp -d %s -i %s" % (guest_ip, ifname), shell=True)
+            test.log.info("Removing the temporary ARP entry successfully")
+
+        test.log.info("Change back Bridge NICs MTU to %s", mtu_default)
+        for iface in target_ifaces:
+            process.run(host_mtu_cmd % (iface, mtu_default), shell=True)