Ubuntu
openvswitch package

  1. Bug #1629053
  2. Comment #11

Comment 11 for bug 1629053

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2018-02-27 02:09 EDT-------
With ubuntu 17.10 as kvm hypervisor, I could not reproduce this problem, so it seems to be fixed.

Below is the default offload configurations for the virtio-net nic.

dev@zesty:~$ ethtool -k enp0s3
Features for enp0s3:
rx-checksumming: on [fixed]
tx-checksumming: on
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: on
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: off
tx-tcp-ecn-segmentation: on
tx-tcp-mangleid-segmentation: off
tx-tcp6-segmentation: on

Here is an establishing session packet dump:

01:53:24.475995 52:54:c1:a2:7c:53 > 52:54:c1:a2:7c:54, ethertype IPv4 (0x0800), length 74: (tos 0x0, ttl 64, id 1919, offset 0, flags [DF], proto TCP (6), length 60)
10.0.129.3.46878 > 10.0.129.4.22: Flags [S], cksum 0xe187 (correct), seq 4289434639, win 29200, options [mss 1460,sackOK,TS val 4294939504 ecr 0,nop,wscale 7], length 0

01:53:24.476020 52:54:c1:a2:7c:54 > 52:54:c1:a2:7c:53, ethertype IPv4 (0x0800), length 74: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 60)
10.0.129.4.22 > 10.0.129.3.46878: Flags [S.], cksum 0x1636 (incorrect -> 0xd213), seq 1650342985, ack 4289434640, win 28960, options [mss 1460,sackOK,TS val 4294930859 ecr 4294939504,nop,wscale 7], length 0

01:53:24.476350 52:54:c1:a2:7c:53 > 52:54:c1:a2:7c:54, ethertype IPv4 (0x0800), length 66: (tos 0x0, ttl 64, id 1920, offset 0, flags [DF], proto TCP (6), length 52)
10.0.129.3.46878 > 10.0.129.4.22: Flags [.], cksum 0x162e (incorrect -> 0x711b), ack 1, win 229, options [nop,nop,TS val 4294939504 ecr 4294930859], length 0

01:53:24.492529 52:54:c1:a2:7c:54 > 52:54:c1:a2:7c:53, ethertype IPv4 (0x0800), length 97: (tos 0x0, ttl 64, id 19942, offset 0, flags [DF], proto TCP (6), length 83)
10.0.129.4.22 > 10.0.129.3.46878: Flags [P.], cksum 0x164d (incorrect -> 0x0f49), seq 1:32, ack 1, win 227, options [nop,nop,TS val 4294930864 ecr 4294939504], length 31

I think, CHECKSUM_UNNECESSARY is being handled correctly for tcp syn, but I do nt have stap set currently in my env. As session gets running without any error, we can close this bug.