[Bug 1904730] Re: neutron-agent-sriov fails to create port

[James Page]

Sponsored patch for bionic update (in UNAPPROVED queue for SRU team
review).

** Also affects: pyroute2 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: pyroute2 (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: pyroute2 (Ubuntu Bionic)
       Status: New => Triaged

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/xena
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/wallaby
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/stein
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/xena
       Status: New => Fix Released

** Changed in: cloud-archive/wallaby
       Status: New => Fix Committed

** Changed in: cloud-archive/ussuri
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1904730

Title:
  neutron-agent-sriov fails to create port

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive queens series:
  New
Status in Ubuntu Cloud Archive stein series:
  New
Status in Ubuntu Cloud Archive train series:
  New
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in Ubuntu Cloud Archive wallaby series:
  Fix Committed
Status in Ubuntu Cloud Archive xena series:
  Fix Released
Status in pyroute2 package in Ubuntu:
  Fix Released
Status in pyroute2 source package in Bionic:
  Triaged
Status in pyroute2 source package in Focal:
  Fix Committed
Status in pyroute2 source package in Hirsute:
  Fix Committed
Status in pyroute2 source package in Impish:
  Fix Released

Bug description:
  [Impact]

  Netlink calls to the kernel can return more than 16k bytes (they can
  return 32k on newer kernels). The pyroute2 library has a default
  buffer size of 16k and fails to read the data when kernel response
  data overflows this.

  One example of where users encounter this is booting OpenStack
  instances with SRIOV when there are more than 32 VFs, as seen in the
  original problem description (included below).

  [Test Case]

  Use an SRIOV capable card and enable more than 32 VFs on a modern
  kernel. Attempt to launch an instance using OpenStack as follows:

  1. Create example network:
  $ juju switch openstack
  $ source ~/deploy/novarc
  $ openstack network create \
  --provider-physical-network sriovfabric \
  --provider-segment 300 \
  --provider-network-type vlan \
  test-sriov

  $ openstack subnet create --network test-sriov \
    --no-dhcp \
    --gateway none \
    --subnet-range 192.168.1.0/24 test-sriov

  2. Create ports over virtual function:
  $ juju switch openstack
  $ source ~/deploy/novarc
  $ openstack port create \
  --network test-sriov \
  --vnic-type direct \
  sriov-vf1

  $ openstack server create \
  --image bionic-kvm \
  --flavor m1.small \
  --network ext-net-300 \
  --port sriov-vf1 \
  --key-name ubuntu-keypair \
  --availability-zone nova:cmp4az1cz20300kvs.mgt.pst.stg.tlc.example.com \
  sriov-vf1

  3. The instance stalls in build state (virsh list shows paused VM) and
  drops to ERROR

  [Where problems could occur]

  Problems may occur in existing customers already using openstack to
  schedule SRIOV instances and may show up as failure to build
  instances. Additional problems could include the increased memory
  usage of the nova processes which occurs by increasing the default
  buffer size. For tightly spec'd systems with small memory allocated to
  the host, this could further eat into any margin available and push
  memory usage over the edge.

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