[Bug 1752162] [NEW] netplan 0.33 silently breaks bridge-priority

[Ryan Harper]

Public bug reported:

1.
# lsb_release -rd
Description:	Ubuntu Bionic Beaver (development branch)
Release:	18.04
# cat /etc/cloud/build.info 
build_name: server
serial: 20180224

2. 
# apt-cache policy nplan
nplan:
  Installed: 0.33
  Candidate: 0.33
  Version table:
 *** 0.33 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status
        
3. netplan configuration creates a bridge with a priority value and matches
the value in /sys/class/net/<bridge name>/bridge/priority

4. /sys/class/net/<bridge_name>/bridge/priority is the default value
32768 despite /etc/netplan/50-cloud-init.yaml specifies a priority value
for the bridge.

--

The networkd renderer silently drops writing of Priority value to the
[Bridge] section in a bridge's .netdev file.

The code says this:

netplan/src/networkd.c:69
#if 0
    /* FIXME: Priority= is not valid for the bridge itself, although it should work as the
         *        STP priority of the bridge itself. It's not supported by networkd, but let's
         *        keep it around in case it becomes supported in the future.
         */
        if (def->bridge_params.priority)
            g_string_append_printf(params, "Priority=%u\n", def->bridge_params.priority);
#endif

But bridge priority is settable via sysfs (with the bridge down) and via
brctl setbridgeprio

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nplan 0.33
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Tue Feb 27 20:14:24 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
SourcePackage: nplan
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nplan (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: amd64 apport-bug bionic third-party-packages uec-images

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https://bugs.launchpad.net/bugs/1752162

Title:
  netplan 0.33 silently breaks bridge-priority

Status in nplan package in Ubuntu:
  Triaged

Bug description:
  1.
  # lsb_release -rd
  Description:	Ubuntu Bionic Beaver (development branch)
  Release:	18.04
  # cat /etc/cloud/build.info 
  build_name: server
  serial: 20180224

  2. 
  # apt-cache policy nplan
  nplan:
    Installed: 0.33
    Candidate: 0.33
    Version table:
   *** 0.33 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status
          
  3. netplan configuration creates a bridge with a priority value and matches
  the value in /sys/class/net/<bridge name>/bridge/priority

  4. /sys/class/net/<bridge_name>/bridge/priority is the default value
  32768 despite /etc/netplan/50-cloud-init.yaml specifies a priority
  value for the bridge.

  --

  The networkd renderer silently drops writing of Priority value to the
  [Bridge] section in a bridge's .netdev file.

  The code says this:

  netplan/src/networkd.c:69
  #if 0
      /* FIXME: Priority= is not valid for the bridge itself, although it should work as the
           *        STP priority of the bridge itself. It's not supported by networkd, but let's
           *        keep it around in case it becomes supported in the future.
           */
          if (def->bridge_params.priority)
              g_string_append_printf(params, "Priority=%u\n", def->bridge_params.priority);
  #endif

  But bridge priority is settable via sysfs (with the bridge down) and
  via brctl setbridgeprio

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: nplan 0.33
  ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  Date: Tue Feb 27 20:14:24 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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