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[OpenStack Infra <1495960@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/246954
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=7ececa3a20e19985b7ebcca2c629126a3900c090
Submitter: Jenkins
Branch:    master

commit 7ececa3a20e19985b7ebcca2c629126a3900c090
Author: Andreas Scheuring <andreas.scheuring@xxxxxxxxxx>
Date:   Wed Nov 18 15:33:03 2015 +0100

    lb: interface name hashing for too long vlan interface names
    
    The linuxbridge agent creates vlan subinterfaces for each vlan
    neutron network. The name for this vlan subinterface is
    "<phys-interface>.<vlan-id>". Todays code crashes if the
    physical interface name is too long. Therefore this hashing is
    being introduced.
    
    Change-Id: Ieb3c0a7282b28eed556236ead4993ab83a29a12f
    Closes-Bug: #1495960


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1495960

Title:
  linuxbridge with vlan crashes when long device names used

Status in neutron:
  Fix Released

Bug description:
  The linuxbridge agent creates a linux vlan-device for each openstack vlan network that has been defined. Therefore the code uses the following naming scheme : <eth-dev-name>.<vlan-id>
  Example: eth-dev-name: eth0, vlan-id: 1000 --> eth0.1000

  This works fine, if eth-dev-name is a short name like "eth0". If there
  is a long device name (e.g. long-device-name) this will cause trouble,
  as the vlan device name "long-device-name.1000" exceeds the max length
  of a linux network device, which is 15 chars.

  Today the linuxbridge agent fails with

  Command: ['ip', 'link', 'add', 'link', 'too_long_name', 'name', 'too_long_name.1007', 'type', 'vlan', 'id', 1007]
  Exit code: 255
  Stderr: Error: argument "too_long_name.1007" is wrong: "name" too long

  The same problem needs to be solved for the new macvtap agent that is
  currently under development [1] as well

  
  [1] https://bugs.launchpad.net/neutron/+bug/1480979

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