[libvirt] [PATCH v2 4/4] qemu: add multiqueue vhost-user support
Martin Kletzander
mkletzan at redhat.com
Thu Jun 4 17:04:16 UTC 2015
From: Maxime Leroy <maxime.leroy at 6wind.com>
This patch adds the support of queues attribute of the driver element
for vhost-user interface type. Example:
<interface type='vhostuser'>
<mac address='52:54:00:ee:96:6d'/>
<source type='unix' path='/tmp/vhost2.sock' mode='client'/>
<model type='virtio'/>
<driver queues='4'/>
</interface>
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1207692
Signed-off-by: Maxime Leroy <maxime.leroy at 6wind.com>
Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
docs/formatdomain.html.in | 11 +++++++++--
src/qemu/qemu_command.c | 14 +++++++++++++-
...ostuser.args => qemuxml2argv-net-vhostuser-multiq.args} | 6 +++++-
...vhostuser.xml => qemuxml2argv-net-vhostuser-multiq.xml} | 6 ++++++
tests/qemuxml2argvtest.c | 3 +++
5 files changed, 36 insertions(+), 4 deletions(-)
copy tests/qemuxml2argvdata/{qemuxml2argv-net-vhostuser.args => qemuxml2argv-net-vhostuser-multiq.args} (75%)
copy tests/qemuxml2argvdata/{qemuxml2argv-net-vhostuser.xml => qemuxml2argv-net-vhostuser-multiq.xml} (87%)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 72ad54cee188..85238a16af8d 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4260,7 +4260,8 @@ qemu-kvm -net nic,model=? /dev/null
type='virtio'/></code>, multiple packet processing queues can be
created; each queue will potentially be handled by a different
processor, resulting in much higher throughput.
- <span class="since">Since 1.0.6 (QEMU and KVM only)</span>
+ <span class="since">Since 1.0.6 (QEMU and KVM only) and for vhost-user
+ since 1.2.17</span>
</dd>
<dt><code>host</code> offloading options</dt>
<dd>
@@ -4581,9 +4582,15 @@ qemu-kvm -net nic,model=? /dev/null
<devices>
<interface type='vhostuser'>
<mac address='52:54:00:3b:83:1a'/>
- <source type='unix' path='/tmp/vhost.sock' mode='server'/>
+ <source type='unix' path='/tmp/vhost1.sock' mode='server'/>
<model type='virtio'/>
</interface>
+ <interface type='vhostuser'>
+ <mac address='52:54:00:3b:83:1b'/>
+ <source type='unix' path='/tmp/vhost2.sock' mode='client'/>
+ <model type='virtio'/>
+ <driver queues='5'/>
+ </interface>
</devices>
...</pre>
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 61faa576e11b..862729f01352 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -8089,6 +8089,7 @@ qemuBuildVhostuserCommandLine(virCommandPtr cmd,
{
virBuffer chardev_buf = VIR_BUFFER_INITIALIZER;
virBuffer netdev_buf = VIR_BUFFER_INITIALIZER;
+ unsigned int queues = net->driver.virtio.queues;
char *nic = NULL;
if (!qemuDomainSupportsNetdev(def, qemuCaps, net)) {
@@ -8126,13 +8127,24 @@ qemuBuildVhostuserCommandLine(virCommandPtr cmd,
virBufferAsprintf(&netdev_buf, "type=vhost-user,id=host%s,chardev=char%s",
net->info.alias, net->info.alias);
+ if (queues > 1) {
+ if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VHOSTUSER_MULTIQ)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("multi-queue is not supported for vhost-user "
+ "with this QEMU binary"));
+ goto error;
+ }
+ virBufferAsprintf(&netdev_buf, ",queues=%u", queues);
+ }
+
virCommandAddArg(cmd, "-chardev");
virCommandAddArgBuffer(cmd, &chardev_buf);
virCommandAddArg(cmd, "-netdev");
virCommandAddArgBuffer(cmd, &netdev_buf);
- if (!(nic = qemuBuildNicDevStr(def, net, -1, bootindex, 0, qemuCaps))) {
+ if (!(nic = qemuBuildNicDevStr(def, net, -1, bootindex,
+ queues, qemuCaps))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("Error generating NIC -device string"));
goto error;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.args b/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.args
similarity index 75%
copy from tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.args
copy to tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.args
index ac43630979ad..8affb53b3958 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.args
@@ -9,4 +9,8 @@ pc -m 214 -smp 1 -nographic -nodefaults -monitor unix:/tmp/test-monitor,server,n
-netdev type=vhost-user,id=hostnet1,chardev=charnet1 \
-device virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:ee:96:6c,bus=pci.0,addr=0x4 \
-netdev socket,listen=:2015,id=hostnet2 \
--device rtl8139,netdev=hostnet2,id=net2,mac=52:54:00:95:db:c0,bus=pci.0,addr=0x5
+-device rtl8139,netdev=hostnet2,id=net2,mac=52:54:00:95:db:c0,bus=pci.0,addr=0x5 \
+-chardev socket,id=charnet3,path=/tmp/vhost2.sock \
+-netdev type=vhost-user,id=hostnet3,chardev=charnet3,queues=4 \
+-device virtio-net-pci,mq=on,vectors=10,netdev=hostnet3,id=net3,mac=52:54:00:ee:96:6d,\
+bus=pci.0,addr=0x6
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.xml b/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.xml
similarity index 87%
copy from tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.xml
copy to tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.xml
index fa09157cd570..422fa920513c 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-net-vhostuser-multiq.xml
@@ -38,6 +38,12 @@
<source port='2015'/>
<model type='rtl8139'/>
</interface>
+ <interface type='vhostuser'>
+ <mac address='52:54:00:ee:96:6d'/>
+ <source type='unix' path='/tmp/vhost2.sock' mode='client'/>
+ <model type='virtio'/>
+ <driver queues='4'/>
+ </interface>
<memballoon model='none'/>
</devices>
</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 11e09ce10d43..26c05452511b 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -980,6 +980,9 @@ mymain(void)
DO_TEST("misc-uuid", QEMU_CAPS_NAME, QEMU_CAPS_UUID);
DO_TEST_PARSE_ERROR("vhost_queues-invalid", NONE);
DO_TEST("net-vhostuser", QEMU_CAPS_DEVICE, QEMU_CAPS_NETDEV);
+ DO_TEST("net-vhostuser-multiq",
+ QEMU_CAPS_DEVICE, QEMU_CAPS_NETDEV, QEMU_CAPS_VHOSTUSER_MULTIQ);
+ DO_TEST_FAILURE("net-vhostuser-multiq", QEMU_CAPS_DEVICE, QEMU_CAPS_NETDEV);
DO_TEST("net-user", NONE);
DO_TEST("net-virtio", NONE);
DO_TEST("net-virtio-device",
--
2.4.2
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