[Bug 1875927] Re: add support for phys_port_name attribute in Xenial/16.04LTS

[Eric Desrochers]

** Description changed:

+ [Impact]
+ In Xenial/16.04LTS, one can't generate network interface name from "phys_port_name" attribute.
+ 
+ "phys_port_name" indicates the interface physical port name within the
+ NIC.
+ 
+ [Test Case]
+ 
+ Check that udev (systemd-udevd) provides the phys_port_name property
+ Tests should be done on both kernel versions: v4.4 and v4.15
+ 
+ [Regression Potential]
+ 
+ Risk: Low
+ * This piece of code is already in place in Bionic (systemd) and late.
+ AFAICT, nothing has been reported since then with regards to this feature.
+ 
+ * phys_port_name kernel support has been introduced in v4.1. Xenial
+ supported kernel are : v4.4 and v4.15 (HWE).
+ 
+ * If a regression arise, it will most likely be limited to the "Ethernet
+ switch device driver model (switchdev)" reported by: rocker, mlxsw,
+ broadcom, ...
+ 
+ [Other informations]
+ https://github.com/systemd/systemd/commit/4887b656c22af059d4e833de7b56544f24951184
+ https://github.com/systemd/systemd/pull/4506
+ 
+ [Original Description]
+ 
  It has been brought to my attention that systemd in Xenial/16.04LTS
  doesn't have support for phys_port_name[0] attribute.
  
  The support has been first introduced in systemd version "232" via:
  https://github.com/systemd/systemd/commit/4887b656c22af059d4e833de7b56544f24951184
  https://github.com/systemd/systemd/pull/4506
  
  Bionic and late have the necessary bits ( systemd >232), but not Xenial
  (229)[1]
  
  Support for "phys_port_name" has been first introduced in the kernel
  with v4.1[2]
  
  [0]
  - https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net
  - https://www.freedesktop.org/software/systemd/man/systemd.net-naming-scheme.html
  - https://www.kernel.org/doc/Documentation/networking/switchdev.txt
  
  [1]
  # git systemd/systemd
  git describe --contains 4887b656c22af059d4e833de7b56544f24951184
  v232~15
  
  # rmadison
   => systemd | 229-4ubuntu21.27 | xenial-updates
   systemd | 237-3ubuntu10.39 | bionic-updates
   systemd | 240-6ubuntu5.8   | disco-updates
   systemd | 242-7ubuntu3.7   | eoan-updates
   systemd | 245.4-4ubuntu3   | focal
   systemd | 245.4-4ubuntu3   | groovy
  
  [2]
  https://github.com/torvalds/linux/commit/db24a9044ee1
  
  $ git describe --contains db24a9044ee1
  v4.1-rc1

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https://bugs.launchpad.net/bugs/1875927

Title:
  add support for phys_port_name attribute in Xenial/16.04LTS

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress

Bug description:
  [Impact]
  In Xenial/16.04LTS, one can't generate network interface name from "phys_port_name" attribute.

  "phys_port_name" indicates the interface physical port name within the
  NIC.

  [Test Case]

  Check that udev (systemd-udevd) provides the phys_port_name property
  Tests should be done on both kernel versions: v4.4 and v4.15

  [Regression Potential]

  Risk: Low
  * This piece of code is already in place in Bionic (systemd) and late.
  AFAICT, nothing has been reported since then with regards to this feature.

  * phys_port_name kernel support has been introduced in v4.1. Xenial
  supported kernel are : v4.4 and v4.15 (HWE).

  * If a regression arise, it will most likely be limited to the
  "Ethernet switch device driver model (switchdev)" reported by: rocker,
  mlxsw, broadcom, ...

  [Other informations]
  https://github.com/systemd/systemd/commit/4887b656c22af059d4e833de7b56544f24951184
  https://github.com/systemd/systemd/pull/4506

  [Original Description]

  It has been brought to my attention that systemd in Xenial/16.04LTS
  doesn't have support for phys_port_name[0] attribute.

  The support has been first introduced in systemd version "232" via:
  https://github.com/systemd/systemd/commit/4887b656c22af059d4e833de7b56544f24951184
  https://github.com/systemd/systemd/pull/4506

  Bionic and late have the necessary bits ( systemd >232), but not
  Xenial (229)[1]

  Support for "phys_port_name" has been first introduced in the kernel
  with v4.1[2]

  [0]
  - https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net
  - https://www.freedesktop.org/software/systemd/man/systemd.net-naming-scheme.html
  - https://www.kernel.org/doc/Documentation/networking/switchdev.txt

  [1]
  # git systemd/systemd
  git describe --contains 4887b656c22af059d4e833de7b56544f24951184
  v232~15

  # rmadison
   => systemd | 229-4ubuntu21.27 | xenial-updates
   systemd | 237-3ubuntu10.39 | bionic-updates
   systemd | 240-6ubuntu5.8   | disco-updates
   systemd | 242-7ubuntu3.7   | eoan-updates
   systemd | 245.4-4ubuntu3   | focal
   systemd | 245.4-4ubuntu3   | groovy

  [2]
  https://github.com/torvalds/linux/commit/db24a9044ee1

  $ git describe --contains db24a9044ee1
  v4.1-rc1

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