[ovs-git] [openvswitch/ovs] eda56e: ovn: Fix IPv6 DAD failure for child ports

[GitHub]

  Branch: refs/heads/branch-2.10
  Home:   https://github.com/openvswitch/ovs
  Commit: eda56edcb924498b25d6e5010107489726ed9510
      https://github.com/openvswitch/ovs/commit/eda56edcb924498b25d6e5010107489726ed9510
  Author: Numan Siddique <nusiddiq at redhat.com>
  Date:   2018-10-10 (Wed, 10 Oct 2018)

  Changed paths:
    M ovn/controller/ofctrl.c
    M ovn/controller/ofctrl.h
    M ovn/controller/physical.c
    M ovn/lib/logical-fields.h
    M tests/ovn.at

  Log Message:
  -----------
  ovn: Fix IPv6 DAD failure for child ports

When a child vlan interface is created inside a VM, the below kernel message
is seen and IPv6 doesn't work on that interface.

[  138.000753] IPv6: vlan4: IPv6 duplicate address <IPv6 LLA> detected!

When a child port sends a broadcast packet, OVN delivers the same
packet back to the child port (and hence the DAD check fails).
This is because 'MLF_ALLOW_LOOPBACK_BIT' is set in REG10 in table 0 when
the packet is received from any child port and table 'OFTABLE_CHECK_LOOPBACK'
doesn't drop the packet.

This patch fixes the issue by using a new register bit (MLF_NESTED_CONTAINER_BIT)
instead of 'MLF_ALLOW_LOOPBACK_BIT' and sets it in REG10 for the packets received
from child ports.

Signed-off-by: Numan Siddique <nusiddiq at redhat.com>
Signed-off-by: Gurucharan Shetty <guru at ovn.org>



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