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qemu: Implement mtu on interface

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Not only we should set the MTU on the host end of the device but
also let qemu know what MTU did we set.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik 2017-01-23 14:33:20 +01:00
parent b020cf73fe
commit 572eda12ad
6 changed files with 90 additions and 3 deletions

2
src/qemu/qemu_capabilities.c

@ -356,6 +356,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"drive-iotune-group",
"query-cpu-model-expansion", /* 245 */
"virtio-net.host_mtu",
);
@ -1642,6 +1643,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioNet[] = {
{ "tx", QEMU_CAPS_VIRTIO_TX_ALG },
{ "event_idx", QEMU_CAPS_VIRTIO_NET_EVENT_IDX },
{ "rx_queue_size", QEMU_CAPS_VIRTIO_NET_RX_QUEUE_SIZE },
{ "host_mtu", QEMU_CAPS_VIRTIO_NET_HOST_MTU },
};
static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioSCSI[] = {

1
src/qemu/qemu_capabilities.h

@ -392,6 +392,7 @@ typedef enum {
/* 245 */
QEMU_CAPS_QUERY_CPU_MODEL_EXPANSION, /* qmp query-cpu-model-expansion */
QEMU_CAPS_VIRTIO_NET_HOST_MTU, /* virtio-net-*.host_mtu */
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;

14
src/qemu/qemu_command.c

@ -3678,6 +3678,16 @@ qemuBuildNicDevStr(virDomainDefPtr def,
}
virBufferAsprintf(&buf, ",rx_queue_size=%u", net->driver.virtio.rx_queue_size);
}
if (usingVirtio && net->mtu) {
if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_NET_HOST_MTU)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("setting MTU is not supported with this QEMU binary"));
goto error;
}
virBufferAsprintf(&buf, ",host_mtu=%u", net->mtu);
}
if (vlan == -1)
virBufferAsprintf(&buf, ",netdev=host%s", net->info.alias);
else
@ -8251,6 +8261,10 @@ qemuBuildInterfaceCommandLine(virQEMUDriverPtr driver,
}
}
if (net->mtu &&
virNetDevSetMTU(net->ifname, net->mtu) < 0)
goto cleanup;
if ((actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
actualType == VIR_DOMAIN_NET_TYPE_ETHERNET ||

7
src/qemu/qemu_domain.c

@ -6541,14 +6541,15 @@ bool
qemuDomainNetSupportsMTU(virDomainNetType type)
{
switch (type) {
case VIR_DOMAIN_NET_TYPE_USER:
case VIR_DOMAIN_NET_TYPE_NETWORK:
case VIR_DOMAIN_NET_TYPE_BRIDGE:
case VIR_DOMAIN_NET_TYPE_ETHERNET:
case VIR_DOMAIN_NET_TYPE_VHOSTUSER:
return true;
case VIR_DOMAIN_NET_TYPE_USER:
case VIR_DOMAIN_NET_TYPE_SERVER:
case VIR_DOMAIN_NET_TYPE_CLIENT:
case VIR_DOMAIN_NET_TYPE_MCAST:
case VIR_DOMAIN_NET_TYPE_NETWORK:
case VIR_DOMAIN_NET_TYPE_BRIDGE:
case VIR_DOMAIN_NET_TYPE_INTERNAL:
case VIR_DOMAIN_NET_TYPE_DIRECT:
case VIR_DOMAIN_NET_TYPE_HOSTDEV:

68
tests/qemuxml2xmloutdata/qemuxml2xmlout-net-mtu.xml Normal file

@ -0,0 +1,68 @@
<domain type='qemu'>
<name>test</name>
<uuid>15d091de-0181-456b-9554-e4382dc1f1ab</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-0.13'>hvm</type>
<boot dev='cdrom'/>
<boot dev='hd'/>
<bootmenu enable='yes'/>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/qemu</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' event_idx='on'/>
<source file='/var/lib/libvirt/images/f14.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/var/lib/libvirt/Fedora-14-x86_64-Live-KDE.iso'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='network'>
<mac address='52:54:00:e5:48:58'/>
<source network='default'/>
<model type='virtio'/>
<mtu size='1500'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<interface type='network'>
<mac address='52:54:00:e5:48:59'/>
<source network='default'/>
<model type='virtio'/>
<mtu size='9000'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
</devices>
</domain>

1
tests/qemuxml2xmltest.c

@ -524,6 +524,7 @@ mymain(void)
DO_TEST("watchdog", NONE);
DO_TEST("net-bandwidth", NONE);
DO_TEST("net-bandwidth2", NONE);
DO_TEST("net-mtu", NONE);
DO_TEST("serial-vc", NONE);
DO_TEST("serial-pty", NONE);