4:23 a.m.
Creating tap device and adding the device to bridge are not atomic operation.
Similarly deleting tap device and removing it from bridge are not atomic operation.
The Problem occurs when two vms start and shutdown. When one vm with the nic
named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
At this time, another vm created the tap device named "vnet0" and added port to
the
same bridge. Then, the first vm deleted the tap device from the same bridge.
Finally, the tap device of the second vm don't attached to the bridge.
So, we can add domid to vm's nic name. For example, the vm's domid is 1 and vnet0
is renamed to vnet1.0.
Signed-off-by: ZhiPeng Lu <lu.zhipeng(a)zte.com.cn>
---
src/qemu/qemu_interface.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_interface.c b/src/qemu/qemu_interface.c
index d0850c0..17d40a7 100644
--- a/src/qemu/qemu_interface.c
+++ b/src/qemu/qemu_interface.c
@@ -512,6 +512,7 @@ qemuInterfaceBridgeConnect(virDomainDefPtr def,
bool template_ifname = false;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
const char *tunpath = "/dev/net/tun";
+ char *domIdPlusIndex = NULL;
if (net->backend.tap) {
tunpath = net->backend.tap;
@@ -531,8 +532,13 @@ qemuInterfaceBridgeConnect(virDomainDefPtr def,
STRPREFIX(net->ifname, VIR_NET_GENERATED_PREFIX) ||
strchr(net->ifname, '%')) {
VIR_FREE(net->ifname);
- if (VIR_STRDUP(net->ifname, VIR_NET_GENERATED_PREFIX "%d") < 0)
+ if (virAsprintf(&domIdPlusIndex, "%s%d.%s",
+ VIR_NET_GENERATED_PREFIX, def->id, "%d") < 0) {
+ goto cleanup;
+ }
+ if (VIR_STRDUP(net->ifname, domIdPlusIndex) < 0) {
goto cleanup;
+ }
/* avoid exposing vnet%d in getXMLDesc or error outputs */
template_ifname = true;
}
@@ -594,6 +600,7 @@ qemuInterfaceBridgeConnect(virDomainDefPtr def,
ret = 0;
cleanup:
+ VIR_FREE(domIdPlusIndex);
if (ret < 0) {
size_t i;
for (i = 0; i < *tapfdSize && tapfd[i] >= 0; i++)
--
1.8.3.1
4:33 a.m.
On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
Creating tap device and adding the device to bridge are not atomic
operation.
Similarly deleting tap device and removing it from bridge are not atomic operation.
The Problem occurs when two vms start and shutdown. When one vm with the nic
named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
At this time, another vm created the tap device named "vnet0" and added port to
the
same bridge. Then, the first vm deleted the tap device from the same bridge.
Finally, the tap device of the second vm don't attached to the bridge.
So, we can add domid to vm's nic name. For example, the vm's domid is 1 and
vnet0
is renamed to vnet1.0.
Surely deleting the NIC automatically removes it from the bridge so we
can just remove the code that delets the bridge port.
Regards,
Daniel
--
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12:08 p.m.
On 04/28/2017 05:33 AM, Daniel P. Berrange wrote:
On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
> Creating tap device and adding the device to bridge are not atomic operation.
> Similarly deleting tap device and removing it from bridge are not atomic operation.
> The Problem occurs when two vms start and shutdown. When one vm with the nic
> named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
> At this time, another vm created the tap device named "vnet0" and added
port to the
> same bridge. Then, the first vm deleted the tap device from the same bridge.
> Finally, the tap device of the second vm don't attached to the bridge.
> So, we can add domid to vm's nic name. For example, the vm's domid is 1 and
vnet0
> is renamed to vnet1.0.
Surely deleting the NIC automatically removes it from the bridge so we
can just remove the code that delets the bridge port.
That is true when using a Linux host bridge, but I recall that for
openvswitch (which I think is what ZhiPeng is using, based on an earlier
patch), you must explicitly remove the port from the bridge - apparently
the port is still there in openvswitch's table as some sort of "zombie"
connection even after the tap device itself no longer exists.
But instead of changing the naming scheme, maybe we should just delete
the bridge port *before* deleting the tap device instead of after. (Am I
recalling correctly that the tap device is deleted automatically when
the qemu process is killed? If so, then what's needed is to move the
loop in qemuProcessStop() that cleans up network interfaces so that it
happens before qemuProcessKill() is called.
3:05 a.m.
On Fri, Apr 28, 2017 at 01:08:45PM -0400, Laine Stump wrote:
On 04/28/2017 05:33 AM, Daniel P. Berrange wrote:
> On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
>> Creating tap device and adding the device to bridge are not atomic operation.
>> Similarly deleting tap device and removing it from bridge are not atomic
operation.
>> The Problem occurs when two vms start and shutdown. When one vm with the nic
>> named "vnet0" stopping, it deleted tap device but not removing port
from bridge.
>> At this time, another vm created the tap device named "vnet0" and
added port to the
>> same bridge. Then, the first vm deleted the tap device from the same bridge.
>> Finally, the tap device of the second vm don't attached to the bridge.
>> So, we can add domid to vm's nic name. For example, the vm's domid is 1
and vnet0
>> is renamed to vnet1.0.
>
> Surely deleting the NIC automatically removes it from the bridge so we
> can just remove the code that delets the bridge port.
That is true when using a Linux host bridge, but I recall that for
openvswitch (which I think is what ZhiPeng is using, based on an earlier
patch), you must explicitly remove the port from the bridge - apparently
the port is still there in openvswitch's table as some sort of "zombie"
connection even after the tap device itself no longer exists.
But instead of changing the naming scheme, maybe we should just delete
the bridge port *before* deleting the tap device instead of after. (Am I
recalling correctly that the tap device is deleted automatically when
the qemu process is killed? If so, then what's needed is to move the
loop in qemuProcessStop() that cleans up network interfaces so that it
happens before qemuProcessKill() is called.
Agreed, we should just reverse the order.
Regards,
Daniel
--
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8:28 a.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
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4:06 a.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
On Thu, May 04, 2017 at 08:28:03AM +0800, lu.zhipeng(a)zte.com.cn wrote:
I'm worried that the network packet loss rate will increase
after
reversing the order.
I don't see why that is relevant - we're killing the guest or unplugging
the NIC, so there's no traffic being sent on this tap device.
Regards,
Daniel
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8:44 a.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
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3:24 a.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
FYI your replies to messages on the list are almost impossible
to read & understand.
Your email client is sending HTML and badly mangled plain text.
Please make it send plain text only to public mailing lists,
with line wrapping and sensibly trim & quote text you are
replying to.
I can't see any comment you made in this latest message so I can't
reply to you.
On Tue, May 09, 2017 at 08:44:55AM +0800, lu.zhipeng(a)zte.com.cn wrote:
On Mon, May 08, 2017 at 03:03:30PM +0800, ZhiPeng Lu wrote:＞＞ In
qemuProcessStop we explicitly remove the port from the openvswitch bridge after＞＞
qemuProcessKill is called. But there is a certain interval of time between＞＞ deleting tap
device and removing it from bridge. The problem occurs when two vms＞＞ start and shutdown
with the same name's network interface attached to the same＞＞ openvswitch bridge. When
one vm with the nic named "vnet0" stopping, it deleted＞＞tap device without
timely removing the port from bridge.＞＞.At this time, another vm created the tap device
named "vnet0" and added port to the＞＞ same bridge. Then, the first vm removed
the port from the same bridge.＞＞ Finally, the tap device of the second vm did not attached
to the bridge.＞＞ We need to delete the bridge port before deleting the tap device instead
of after.＞＞ So what's needed is to move the loop in qemuProcessStop that cleans up＞＞
network interfaces so that it happens before qemuProcessKill is called.＞This fix won't
work correctly either. You cannot assume that libvirt has＞control over when the QEMU
process exits. It may exit itself *before*＞libvirt runs any of its cleanup code.
On Mon, May 08, 2017 at 06:18:25PM +0800, lu.zhipeng(a)zte.com.cn wrote:＞ I may not have
described it clearly. ＞ ＞ i need to ensure the order of adding port to bridge and
deleting from bridge.＞ ＞ i rename tap device to avoid the problem in my first patch.i
think it can solve the problem.＞ ＞ my second patch may can't resolve the problem .＞ ＞
Do you have any better ideas?
g>
为了让您的VPlat虚拟化故障得到高效的处理，请上报故障到: $VPlat技术支持。
芦志朋 luzhipeng
IT开发工程师 IT Development
Engineer
操作系统产品部/中心研究院/系统产品 OS Product Dept./Central R＆D Institute/System Product
深圳市南山区科技南路55号中兴通讯研发大楼33楼
33/F, R&D Building, ZTE
Corporation Hi-tech Road South,
Hi-tech
Industrial Park Nanshan District, Shenzhen, P.R.China, 518057
T: +86 755 xxxxxxxx F:+86 755 xxxxxxxx
M: +86 xxxxxxxxxxx
E: lu.zhipeng(a)zte.com.cn
www.zte.com.cn
原始邮件
发件人： ＜berrange(a)redhat.com>
收件人： ＜laine(a)laine.org>
抄送人： ＜libvir-list(a)redhat.xn--com>10108272-u92xv15exu8g
日 期 ：2017年05月02日 16:41
主 题 ：Re: [libvirt] [PATCH] qemu: change the name of tap device for a tapand bridge
network
On Fri, Apr 28, 2017 at 01:08:45PM -0400, Laine Stump wrote:
＞ On 04/28/2017 05:33 AM, Daniel P. Berrange wrote:
＞ ＞ On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
＞ ＞＞ Creating tap device and adding the device to bridge are not atomic operation.
＞ ＞＞ Similarly deleting tap device and removing it from bridge are not atomic operation.
＞ ＞＞ The Problem occurs when two vms start and shutdown. When one vm with the nic
＞ ＞＞ named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
＞ ＞＞ At this time, another vm created the tap device named "vnet0" and added
port to the
＞ ＞＞ same bridge. Then, the first vm deleted the tap device from the same bridge.
＞ ＞＞ Finally, the tap device of the second vm don't attached to the bridge.
＞ ＞＞ So, we can add domid to vm's nic name. For example, the vm's domid is 1 and
vnet0
＞ ＞＞ is renamed to vnet1.0.
＞ ＞
＞ ＞ Surely deleting the NIC automatically removes it from the bridge so we
＞ ＞ can just remove the code that delets the bridge port.
＞
＞ That is true when using a Linux host bridge, but I recall that for
＞ openvswitch (which I think is what ZhiPeng is using, based on an earlier
＞ patch), you must explicitly remove the port from the bridge - apparently
＞ the port is still there in openvswitch's table as some sort of "zombie"
＞ connection even after the tap device itself no longer exists.
＞
＞
＞ But instead of changing the naming scheme, maybe we should just delete
＞ the bridge port *before* deleting the tap device instead of after. (Am I
＞ recalling correctly that the tap device is deleted automatically when
＞ the qemu process is killed? If so, then what's needed is to move the
＞ loop in qemuProcessStop() that cleans up network interfaces so that it
＞ happens before qemuProcessKill() is called.
Agreed, we should just reverse the order.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
7:15 a.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
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6:23 p.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
Possibly related I notice race conditions caused by vnic never getting
loaded if an existing bridge is already up (by OS init scripts etc) and
stopping VM's from getting started.
Often this is behavior you want ; i.e having Host Hypervisor NIC's added
and up before libvirtd sets up it's nics/bridges.
On 29 April 2017 at 11:15, <lu.zhipeng(a)zte.com.cn> wrote:
＞On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
＞＞ Creating tap device and adding the device to bridge
are not atomic operation.
＞＞ Similarly deleting tap device and removing it from bridge
are not atomic operation.
＞＞The Problem occurs when two vms start and shutdown. When
one vm with the nic
＞＞ named "vnet0" stopping, it deleted tap device but not
removing port from bridge.
＞＞ At this time, another vm created the tap device named "
vnet0" and added port to the
＞＞ same bridge. Then, the first vm deleted the tap device
from the same bridge.
＞＞ Finally, the tap device of the second vm don't attached to the bridge.
＞＞ So, we can add domid to vm's nic name. For example, the vm'
s domid is 1 and vnet0
＞＞ is renamed to vnet1.0.
＞Surely deleting the NIC automatically removes it from the bridge so we
＞can just remove the code that delets the bridge port.
i have done some tests for a tap + openvswitch bridge network. i find
the nic named "vnet0" don't exsit before calling the
virNetDevOpenvswitchRemovePort.
i think the tap is deleted not by removingport from bridge. i think
hotpluging net has the same problem.
by the way:
my company's e-mail does not support thread posting and has some
other problems. i believe that my colleagues can soon resloved them.
*为了让您的VPlat虚拟化故障得到高效的处理，请上报故障到: $VPlat技术支持。*
芦志朋 luzhipeng
IT开发工程师 IT Development Engineer
操作系统产品部/中心研究院/系统产品 OS Product Dept./Central R＆D Institute/System Product
深圳市南山区科技南路55号中兴通讯研发大楼33楼
33/F, R&D Building, ZTE Corporation Hi-tech Road South,
Hi-tech Industrial Park Nanshan District, Shenzhen, P.R.China, 518057
T: +86 755 xxxxxxxx F:+86 755 xxxxxxxx
M: +86 xxxxxxxxxxx
E: lu.zhipeng(a)zte.com.cn
www.zte.com.cn
原始邮件
*发件人：* ＜berrange(a)redhat.com>;
*收件人：*芦志朋10108272;
*抄送人：* ＜libvir-list(a)redhat.com>;
*日 期 ：*2017年04月28日 19:27
*主 题 ：**Re: [libvirt] [PATCH] qemu: change the name of tap device for a
tapand bridge network*
On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
＞ Creating tap device and adding the device to bridge
are not atomic operation.
＞ Similarly deleting tap device and removing it from
bridge are not atomic operation.
＞ The Problem occurs when two vms start and shutdown. When
one vm with the nic
＞ named "vnet0" stopping, it deleted tap device but not
removing port from bridge.
＞ At this time, another vm created the tap device named "
vnet0" and added port to the
＞ same bridge. Then, the first vm deleted the tap
device from the same bridge.
＞ Finally, the tap device of the second vm don't attached to the bridge.
＞ So, we can add domid to vm's nic name. For example, the
vm's domid is 1 and vnet0
＞ is renamed to vnet1.0.
Surely deleting the NIC automatically removes it from the bridge so we
can just remove the code that delets the bridge port.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/
photos/dberrange :|
|: https://libvirt.org -o- https://
fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.
instagram.com/dberrange :|
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9:45 p.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
On 04/28/2017 07:23 PM, Joel Wirāmu Pauling wrote:
Possibly related I notice race conditions caused by vnic never
getting
loaded if an existing bridge is already up (by OS init scripts etc) and
stopping VM's from getting started.
Can you explain this more exactly? In particular, by "vnic" do you mean
the network device as seen by the guest? And what do you mean by the
term "getting loaded"? (It doesn't make sense to me that you should mean
the network device in the guest, unless "stopping VM's from getting
started" just means that the guest doesn't become fully functional,
rather than that the qemu process doesn't start). Beyond that, of course
the bridge that the tap device will be connected to needs to exist
before you can connect something to it - I don't understand how its
existence could cause a failure; rather its *non*-existence would cause
a failure. (As you can see by my wild suppositions that make no sense,
the terms you've used are a bit too vague/open to interpretation for me
to understand exactly the problem you're referring to)
(Hmm - perhaps you're referring to the situation where libvirt attempts
to create a bridge on the host for one of its virtual networks, but
either a bridge by that name has already been created by "someone else"
or another netdev already exists on the host that is on the same subnet
(and thus has the same route)? Your description doesn't fit that very
well, but that is a known problem and unrelated to the patch/problem
we're discussing here.
Often this is behavior you want ; i.e having Host Hypervisor NIC's added
and up before libvirtd sets up it's nics/bridges.
On 29 April 2017 at 11:15, <lu.zhipeng(a)zte.com.cn
<mailto:lu.zhipeng@zte.com.cn>> wrote:
＞On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
＞＞
Creating tap device and adding the device to bridge are not atomic operation.
＞＞
Similarly deleting tap device and removing it from bridge are not atomic operation.
＞＞The Problem occurs when two vms start and shutdown. When one vm with the nic
＞＞
named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
＞＞
At this time, another vm created the tap device named "vnet0" and added
port to the
＞＞
same bridge. Then, the first vm deleted the tap device from the same bridge.
＞＞
Finally, the tap device of the second vm don't attached to the bridge.
＞＞
So, we can add domid to vm's nic name. For example, the vm's domid is 1 and
vnet0
＞＞ is renamed to vnet1.0.
＞Surely deleting the NIC automatically removes it from the bridge so we
＞can just remove the code that delets the bridge port.
i have done some tests for a tap + openvswitch bridge network. i
find the nic named "vnet0" don't exsit before calling
the virNetDevOpenvswitchRemovePort.
i think the tap is deleted not by removingport from bridge. i
think hotpluging net has the same problem.
by the way:
my company's e-mail does not support thread posting and has
some other problems. i believe that my colleagues can soon resloved
them.
*为了让您的VPlat虚拟化故障得到高效的处理，请上报故障到: $VPlat技术支
持。*
芦志朋 luzhipeng
IT开发工程师 IT Development Engineer
操作系统产品部/中心研究院/系统产品 OS Product Dept./Central R＆D
Institute/System Product
深圳市南山区科技南路55号中兴通讯研发大楼33楼
33/F, R&D Building, ZTE Corporation Hi-tech Road South,
Hi-tech Industrial Park Nanshan District, Shenzhen, P.R.China, 518057
T: +86 755 xxxxxxxx F:+86 755 xxxxxxxx
M: +86 xxxxxxxxxxx
E: lu.zhipeng(a)zte.com.cn <mailto:lu.zhipeng@zte.com.cn>
www.zte.com.cn <http://www.zte.com.cn/>
原始邮件
*发件人：*＜berrange(a)redhat.com <mailto:berrange@redhat.com>＞;
*收件人：*芦志朋10108272;
*抄送人：*＜libvir-list(a)redhat.com <mailto:libvir-list@redhat.com>＞;
*日 期 ：*2017年04月28日 19:27
*主 题 ：**Re: [libvirt] [PATCH] qemu: change the name of tap device
for a tapand bridge network*
On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
＞ Creating tap device and adding the device to bridge are not atomic operation.
＞ Similarly deleting tap device and removing it from bridge are not atomic
operation.
＞ The Problem occurs when two vms start and shutdown. When one vm with the nic
＞ named "vnet0" stopping, it deleted tap device but not removing port from
bridge.
＞ At this time, another vm created the tap device named "vnet0" and added
port to the
＞ same bridge. Then, the first vm deleted the tap device from the same bridge.
＞ Finally, the tap device of the second vm don't attached to the bridge.
＞ So, we can add domid to vm's nic name. For example, the vm's domid is 1 and
vnet0
＞ is renamed to vnet1.0.
Surely deleting the NIC automatically removes it from the bridge so we
can just remove the code that delets the bridge port.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange
<https://www.flickr.com/photos/dberrange> :|
|: https://libvirt.org -o- https://fstop138.berrange.com
<https://fstop138.berrange.com> :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange
<https://www.instagram.com/dberrange> :|
--
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<https://www.redhat.com/mailman/listinfo/libvir-list>
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10:20 p.m.
New subject: [libvirt] 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
I'll try and explain the steps/situation where this is an issue.
Say for example you have your router/dhcpd done inside a VM guest - you use
macvtap devices and vlans off the hypervisor to get the traffic in and out
(WAN and LAN). And you want the LAN side to provide connectivity to the
host as well as to the network beyond the host.
this is on a Ubuntu 16.04 host.
1) Create and isolated virtual Network via libvirt xml - say 'LAN' this is
the second network (assume default exists) creates virbr1 and a vnic1 This
is addition to the WAN and LAN macvtap devices. Unbeknown-st to libvirt the
LAN macvtap is going to end up bridge to the 'isolated' network by the VM.
2) the virbr1 bridge needs numbering
vnic1 is attached inside the VM to a dhcpd server but you still need the
virbr1 interface to be numbered on the hypervisor (but you don't want the
libvirt networking to take care of the numbering etc becuase that's what
your fancy NFV VM is going to handle). Manually it's easy at this point you
just run dhclient et.al on the bridge and you are good to go.
BUT you want this to happen at boot; adding any sort of etc/network or
/etc/sysconfig/networking scripts refering to that virbr1 will create a
race condition which will stop the vm from getting started as you mention.
On 29 April 2017 at 14:45, Laine Stump <laine(a)laine.org> wrote:
On 04/28/2017 07:23 PM, Joel Wirāmu Pauling wrote:
> Possibly related I notice race conditions caused by vnic never getting
> loaded if an existing bridge is already up (by OS init scripts etc) and
> stopping VM's from getting started.
Can you explain this more exactly? In particular, by "vnic" do you mean
the network device as seen by the guest? And what do you mean by the
term "getting loaded"? (It doesn't make sense to me that you should mean
the network device in the guest, unless "stopping VM's from getting
started" just means that the guest doesn't become fully functional,
rather than that the qemu process doesn't start). Beyond that, of course
the bridge that the tap device will be connected to needs to exist
before you can connect something to it - I don't understand how its
existence could cause a failure; rather its *non*-existence would cause
a failure. (As you can see by my wild suppositions that make no sense,
the terms you've used are a bit too vague/open to interpretation for me
to understand exactly the problem you're referring to)
(Hmm - perhaps you're referring to the situation where libvirt attempts
to create a bridge on the host for one of its virtual networks, but
either a bridge by that name has already been created by "someone else"
or another netdev already exists on the host that is on the same subnet
(and thus has the same route)? Your description doesn't fit that very
well, but that is a known problem and unrelated to the patch/problem
we're discussing here.
>
> Often this is behavior you want ; i.e having Host Hypervisor NIC's added
> and up before libvirtd sets up it's nics/bridges.
>
>
> On 29 April 2017 at 11:15, <lu.zhipeng(a)zte.com.cn
> <mailto:lu.zhipeng@zte.com.cn>> wrote:
>
>
> ＞On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
> ＞＞
> Creating tap device and adding the device to bridge are not atomic
operation.
> ＞＞
> Similarly deleting tap device and removing it from bridge are not
atomic operation.
> ＞＞The Problem occurs when two vms start and shutdown. When one vm
with the nic
> ＞＞
> named "vnet0" stopping, it deleted tap device but not removing port
from bridge.
> ＞＞
> At this time, another vm created the tap device named "vnet0" and
added port to the
> ＞＞
> same bridge. Then, the first vm deleted the tap device from the same
bridge.
> ＞＞
> Finally, the tap device of the second vm don't attached to the
bridge.
> ＞＞
> So, we can add domid to vm's nic name. For example, the vm's domid
is 1 and vnet0
> ＞＞ is renamed to vnet1.0.
>
> ＞Surely deleting the NIC automatically removes it from the bridge so
we
> ＞can just remove the code that delets the bridge port.
>
> i have done some tests for a tap + openvswitch bridge network. i
> find the nic named "vnet0" don't exsit before calling
> the virNetDevOpenvswitchRemovePort.
>
> i think the tap is deleted not by removingport from bridge. i
> think hotpluging net has the same problem.
>
>
> by the way:
>
> my company's e-mail does not support thread posting and has
> some other problems. i believe that my colleagues can soon resloved
> them.
>
>
>
>
>
>
> *为了让您的VPlat虚拟化故障得到高效的处理，请上报故障到: $VPlat技术支
> 持。*
>
> 芦志朋 luzhipeng
>
>
> IT开发工程师 IT Development Engineer
> 操作系统产品部/中心研究院/系统产品 OS Product Dept./Central R＆D
> Institute/System Product
>
>
>
> 深圳市南山区科技南路55号中兴通讯研发大楼33楼
> 33/F, R&D Building, ZTE Corporation Hi-tech Road South,
> Hi-tech Industrial Park Nanshan District, Shenzhen, P.R.China, 518057
> T: +86 755 xxxxxxxx F:+86 755 xxxxxxxx
> M: +86 xxxxxxxxxxx
> E: lu.zhipeng(a)zte.com.cn <mailto:lu.zhipeng@zte.com.cn>
> www.zte.com.cn <http://www.zte.com.cn/>
>
> 原始邮件
> *发件人：*＜berrange(a)redhat.com <mailto:berrange@redhat.com>＞;
> *收件人：*芦志朋10108272;
> *抄送人：*＜libvir-list(a)redhat.com <mailto:libvir-list@redhat.com>＞;
> *日 期 ：*2017年04月28日 19:27
> *主 题 ：**Re: [libvirt] [PATCH] qemu: change the name of tap device
> for a tapand bridge network*
>
>
> On Fri, Apr 28, 2017 at 05:23:19PM +0800, ZhiPeng Lu wrote:
> ＞ Creating tap device and adding the device to bridge are not atomic
operation.
> ＞ Similarly deleting tap device and removing it from bridge are not
atomic operation.
> ＞ The Problem occurs when two vms start and shutdown. When one vm
with the nic
> ＞ named "vnet0" stopping, it deleted tap device but not removing
port from bridge.
> ＞ At this time, another vm created the tap device named "vnet0" and
added port to the
> ＞ same bridge. Then, the first vm deleted the tap device from the
same bridge.
> ＞ Finally, the tap device of the second vm don't attached to the
bridge.
> ＞ So, we can add domid to vm's nic name. For example, the vm's domid
is 1 and vnet0
> ＞ is renamed to vnet1.0.
>
> Surely deleting the NIC automatically removes it from the bridge so
we
> can just remove the code that delets the bridge port.
>
>
> Regards,
> Daniel
> --
> |: https://berrange.com -o- https://www.flickr.com/photos/
dberrange
> <https://www.flickr.com/photos/dberrange> :|
> |: https://libvirt.org -o-
https://fstop138.berrange.com
> <https://fstop138.berrange.com> :|
> |: https://entangle-photo.org -o- https://www.instagram.com/
dberrange
> <https://www.instagram.com/dberrange> :|
>
> --
> libvir-list mailing list
> libvir-list(a)redhat.com <mailto:libvir-list@redhat.com>
> https://www.redhat.com/mailman/listinfo/libvir-list
> <https://www.redhat.com/mailman/listinfo/libvir-list>
>
>
>
>
> --
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> https://www.redhat.com/mailman/listinfo/libvir-list
> <https://www.redhat.com/mailman/listinfo/libvir-list>
>
>
>
>
> --
> libvir-list mailing list
> libvir-list(a)redhat.com
> https://www.redhat.com/mailman/listinfo/libvir-list
>
12:51 p.m.
New subject: [libvirt] 答复: Re: 答复: Re: [PATCH] qemu: change the name of tap device for a tapand bridge network
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12 comments
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participants (5)
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Daniel P. Berrange -
Joel Wirāmu Pauling -
Laine Stump -
lu.zhipeng＠zte.com.cn -
ZhiPeng Lu