[Xen-users] domU network problem

[Thorsten Seeger <tseeger@xxxxxx>]

Hallo,

i have a lot of incorrect checksum errors on my network connection on
domU <--> domU
dom0 <--> domU

I started to switch off the checksum offload but i have problems to do
this inside a domUs with newer kernel:

kernel: linux-image-3.14-1-amd64
debian: jessie

root@vm004:~# ethtool -k eth0
Features for eth0:
rx-checksumming: on [fixed]
tx-checksumming: on
     tx-checksum-ipv4: on [fixed]
     tx-checksum-ip-generic: off [fixed]
     tx-checksum-ipv6: on
     tx-checksum-fcoe-crc: off [fixed]
     tx-checksum-sctp: off [fixed]
...

root@vm004:~# ethtool -K eth0 tx off
Actual changes:
tx-checksum-ipv6: off
tx-tcp6-segmentation: off [requested on]

root@vm004:~# ethtool -k eth0
rx-checksumming: on [fixed]
tx-checksumming: on
    tx-checksum-ipv4: on [fixed]
    tx-checksum-ip-generic: off [fixed]
    tx-checksum-ipv6: off
    tx-checksum-fcoe-crc: off [fixed]
    tx-checksum-sctp: off [fixed]
...

root@vm004:~# ethtool -K eth0 tx-checksum-ipv4 off
Could not change any device features

root@vm004:~# ethtool -K eth0 rx off
Cannot change rx-checksumming
Could not change any device features

root@vm004:~# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:16:3e:ed:f9:54
          inet addr:10.0.0.4  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:feed:f954/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1287 errors:0 dropped:493 overruns:0 frame:0
          TX packets:622 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:81455 (79.5 KiB)  TX bytes:123431 (120.5 KiB)


On dom0 it works:

root@stargate:/# ethtool -k xenbr0
Features for xenbr0:
rx-checksumming: off [fixed]
tx-checksumming: off
      tx-checksum-ipv4: off [fixed]
      tx-checksum-ip-generic: off
      tx-checksum-ipv6: off [fixed]
      tx-checksum-fcoe-crc: off [fixed]
      tx-checksum-sctp: off [fixed]



Anyone has a idea why i can  change the feature? What means [fixed]?


best regards
Thorsten

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