Re: [libvirt] nodedev-dumpxml doesn't refresh supported offload NIC capabilities

Hi Laine, I verified your fix and it working. Do I need to fill bug for this? From: sendmail [mailto:justsendmailnothingelse@gmail.com] On Behalf Of Laine Stump Sent: Tuesday, June 16, 2015 6:50 PM To: libvir-list(a)redhat.com Cc: Moshe Levi Subject: Re: [libvirt] nodedev-dumpxml doesn't refresh supported offload NIC capabilities 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. -- libvir-list mailing list libvir-list@redhat.com<mailto:libvir-list@redhat.com> https://www.redhat.com/mailman/listinfo/libvir-list