10:50 a.m.
On 06/16/2015 10:12 AM, Moshe Levi wrote:
Hi,
I was playing with the nodedev-dumpxml to see the supported offload
NIC capabilities, and
It seem that if I disable one of offloading capabilities using ethtool
command nodedev-dumpxml it still return
the feature as enabled. To get the correct offloading capabilities I
have to restart libvirtd.
I was wandering if that is an expected behavior in lbivirt .
the nodedevice driver caches all the information it gets from udev, and
tries to rely on udev generating events when something changes. In
general this is a bad idea, and has led to at least 2 bug reports I can
think of. The function update_caps() in the nodedev driver is intended
to be filled in with code to update those attributes of a device that
don't get properly updated via udev event responses. It looks like all
that would be required in your situation would be to add a call to
virNetDevGetFeatures() to the VIR_NODE_DEV_CAP_NET case of the switch in
that function. It's complicated a bit by the fact that
virNetDevGetFeatures() leaks any existing bitmap of features when it's
called. I'm sending a short patch that should fix your problem, which
should show up on the list in a few minutes.
Please see example below with the rx capabilities disabled.
virsh # nodedev-dumpxml net_enp4s0_f4_52_14_11_73_81
<device>
<name>net_enp4s0_f4_52_14_11_73_81</name>
<path>/sys/devices/pci0000:00/0000:00:02.0/0000:04:00.0/net/enp4s0</path>
<parent>pci_0000_04_00_0</parent>
<capability
type='net'>
<interface>enp4s0</interface>
<address>f4:52:14:11:73:81</address>
<link speed='40000'
state='up'/>
<feature
name='rx'/>
<feature
name='tx'/>
<feature name='sg'/>
<feature
name='tso'/>
<feature
name='gso'/>
<feature
name='gro'/>
<feature
name='rxvlan'/>
<feature
name='txvlan'/>
<feature
name='rxhash'/>
<capability
type='80203'/>
</capability>
</device>
ethtool -K enp4s0 rx off
virsh # nodedev-dumpxml net_enp4s0_f4_52_14_11_73_81
<device>
<name>net_enp4s0_f4_52_14_11_73_81</name>
<path>/sys/devices/pci0000:00/0000:00:02.0/0000:04:00.0/net/enp4s0</path>
<parent>pci_0000_04_00_0</parent>
<capability
type='net'>
<interface>enp4s0</interface>
<address>f4:52:14:11:73:81</address>
<link speed='40000'
state='up'/>
<feature
name='rx'/>
<feature
name='tx'/>
<feature
name='sg'/>
<feature
name='tso'/>
<feature name='gso'/>
<feature
name='gro'/>
<feature
name='rxvlan'/>
<feature name='txvlan'/>
<feature
name='rxhash'/>
<capability
type='80203'/>
</capability>
</device>
virsh #
[root@r-ae-host05 bin]# ps -ef | grep libvirt
root 16743 23086 0 16:43 pts/2 00:00:00 ../sbin/libvirtd
root 17440 23086 0 16:47 pts/2 00:00:00 grep --color=auto libvirt
[root@r-ae-host05 bin]# kill 16743
[root@r-ae-host05 bin]# ../sbin/libvirtd &
[2] 17489
[1] Done ../sbin/libvirtd
[root@r-ae-host05 bin]#
[root@r-ae-host05 bin]#
[root@r-ae-host05 bin]# ./virsh
virsh # nodedev-dumpxml net_enp4s0_f4_52_14_11_73_81
<device>
<name>net_enp4s0_f4_52_14_11_73_81</name>
<path>/sys/devices/pci0000:00/0000:00:02.0/0000:04:00.0/net/enp4s0</path>
<parent>pci_0000_04_00_0</parent>
<capability type='net'>
<interface>enp4s0</interface>
<address>f4:52:14:11:73:81</address>
<link speed='40000' state='up'/>
<feature name='tx'/>
<feature name='sg'/>
<feature name='tso'/>
<feature name='gso'/>
<feature name='gro'/>
<feature name='rxvlan'/>
<feature name='txvlan'/>
<feature name='rxhash'/>
<feature name='rdma'/>
<capability type='80203'/>
</capability>
</device>
Thanks,
Moshe Levi.
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