[libvirt-users] VM: Unable to enable scatter-gather / tx-checksumming / tcp-segmentation offload
In my Linux VM, I am unable to change scatter-gather / tx-checksumming / TCP-segmentation offload features by ethtool command. I am using virtio nic with vhostuser port backend. It shows me an error: Cannot change tx-checksumming Cannot change scatter-gather Cannot change tcp-segmentation offload Could not change any device features Ony running command ethtool -k ens3, I get the following: [image: image.png] If there is something that needs to be changed in the domain XML itself then please guide me what changes to do?
On 5/3/19 10:19 AM, Harsh Gondaliya wrote:
In my Linux VM, I am unable to change scatter-gather / tx-checksumming / TCP-segmentation offload features by ethtool command. I am using virtio nic with vhostuser port backend. It shows me an error: Cannot change tx-checksumming Cannot change scatter-gather Cannot change tcp-segmentation offload Could not change any device features
You need to enable those in domain XML: https://libvirt.org/formatdomain.html#elementsDriverBackendOptions
Ony running command ethtool -k ens3, I get the following: [image: image.png]
Oh¸ it's way better to post this as a text rather than image. Some of us use text clients to read e-mails. Michal
This is what I was trying to show in that image. root@vm2-Standard-PC-i440FX-PIIX-1996:/home/vm2# ethtool -k ens3 Features for ens3: rx-checksumming: on [fixed] tx-checksumming: off tx-checksum-ipv4: off [fixed] tx-checksum-ip-generic: off [fixed] tx-checksum-ipv6: off [fixed] tx-checksum-fcoe-crc: off [fixed] tx-checksum-sctp: off [fixed] scatter-gather: off tx-scatter-gather: off [fixed] tx-scatter-gather-fraglist: off [fixed] tcp-segmentation-offload: off tx-tcp-segmentation: off [fixed] tx-tcp-ecn-segmentation: off [fixed] tx-tcp6-segmentation: off [fixed] udp-fragmentation-offload: off [fixed] generic-segmentation-offload: off [requested on] generic-receive-offload: on large-receive-offload: off [fixed] rx-vlan-offload: off [fixed] tx-vlan-offload: off [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: on [fixed] rx-vlan-filter: on [fixed] vlan-challenged: off [fixed] tx-lockless: off [fixed] netns-local: off [fixed] tx-gso-robust: off [fixed] tx-fcoe-segmentation: off [fixed] tx-gre-segmentation: off [fixed] tx-ipip-segmentation: off [fixed] tx-sit-segmentation: off [fixed] tx-udp_tnl-segmentation: off [fixed] fcoe-mtu: off [fixed] tx-nocache-copy: off loopback: off [fixed] rx-fcs: off [fixed] rx-all: off [fixed] tx-vlan-stag-hw-insert: off [fixed] rx-vlan-stag-hw-parse: off [fixed] rx-vlan-stag-filter: off [fixed] l2-fwd-offload: off [fixed] busy-poll: on [fixed] hw-tc-offload: off [fixed] root@vm2-Standard-PC-i440FX-PIIX-1996:/home/vm2# ethtool -K ens3 sg on tx on tso on gso on Cannot change tx-checksumming Cannot change scatter-gather Cannot change tcp-segmentation-offload Could not change any device features root@vm2-Standard-PC-i440FX-PIIX-1996:/home/vm2# I have changed my VM domain XML file to: <interface type='vhostuser'> <mac address='52:54:00:e0:07:94'/> <source type='unix' path='/usr/local/var/run/openvswitch/vhost-user2' mode='client'/> <model type='virtio'/> <driver name='vhost' queues='6'> <host csum='on' gso='on' tso4='on' tso6='on' ecn='on' ufo='on' mrg_rxbuf='on'/> <guest csum='on' tso4='on' tso6='on' ecn='on' ufo='on'/> </driver> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> Still, I get the same error. I want to get TSO feature in this DPDK vhost user port. Unable to enable it. On Fri, May 3, 2019 at 6:29 PM Michal Privoznik <mprivozn@redhat.com> wrote:
On 5/3/19 10:19 AM, Harsh Gondaliya wrote:
In my Linux VM, I am unable to change scatter-gather / tx-checksumming / TCP-segmentation offload features by ethtool command. I am using virtio nic with vhostuser port backend. It shows me an error: Cannot change tx-checksumming Cannot change scatter-gather Cannot change tcp-segmentation offload Could not change any device features
You need to enable those in domain XML:
https://libvirt.org/formatdomain.html#elementsDriverBackendOptions
Ony running command ethtool -k ens3, I get the following: [image: image.png]
Oh¸ it's way better to post this as a text rather than image. Some of us use text clients to read e-mails.
Michal
participants (2)
-
Harsh Gondaliya -
Michal Privoznik