＞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
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Industrial Park Nanshan District, Shenzhen, P.R.China, 518057
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E: lu.zhip...@zte.com.cn
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原始邮件
发件人： ＜berra...@redhat.com＞
收件人：芦志朋10108272
抄送人： ＜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
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