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[Dimitri John Ledkov <launchpad@xxxxxxxxxxxx>]

One can attempt to do:
$ cat /sys/class/net/encc000/device/card_type
in some modes it will tell you if the card is real or not, e.g.:
"OSD_10GIG"
is real card on an lpar.

on KVM that file doesn't exist as device is a symlink to "virtio0".

on z/VM it has:
"Virt.NIC QDIO"

Which is well, a fake virtualised card that can be anything.

I would recommend to verify link speeds for an interface on s390x if:
1)  /sys/class/net/<interface>/device/card_type exists
2) does not start with Virt
3) does not have "unknown"
4) does not have HiperSockets
5) starts with OS -> which should catch all known physical cards e.g. OSD_100/1000/10GIG/FE_LATE/GbE_NAME/ATM_LANE/Express; OSN; OSM_1000; OSX_10GIG

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https://bugs.launchpad.net/bugs/1572347

Title:
  problems with network speed reporting in sysfs on s390

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On an amd64 system with a 1Gb NIC, I can examine
  /sys/class/net/<DEVICE> for various bits of data.  In this case, we
  need link speed.

  For example:

  bladernr@galactica:~/Datacenters/Home$ cat /sys/class/net/enp2s0/speed 
  1000

  However, on my z/VM instance of Xenial on s390, the reported speed is WAY below what it actually is:
  hwe@hwe-zvm1:/sys/class/net/enc600$ cat speed
  10

  iperf confirms that this virtual device is actually functioning at 1Gb
  speeds.  This is causing failures in the cert networking tests that
  probe for reported link speed and then compare that to reported
  maximum speed.

  On a zKVM instance of Xenial, this is even worse as I am completely
  unable to examine /sys/class/net/<DEVICE>/speed at all:

  hwe@s1lp9g003:~$ cat /sys/class/net/eth0/speed 
  cat: /sys/class/net/eth0/speed: Invalid argument
  hwe@s1lp9g003:/sys/class/net/eth0$ ll
  total 0
  drwxr-xr-x 5 root root    0 Apr 19 20:02 ./
  drwxr-xr-x 3 root root    0 Apr 19 20:02 ../
  -r--r--r-- 1 root root 4096 Apr 19 20:02 addr_assign_type
  -r--r--r-- 1 root root 4096 Apr 19 20:02 addr_len
  -r--r--r-- 1 root root 4096 Apr 19 20:02 address
  -r--r--r-- 1 root root 4096 Apr 19 20:02 broadcast
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 carrier
  -r--r--r-- 1 root root 4096 Apr 19 20:02 carrier_changes
  -r--r--r-- 1 root root 4096 Apr 19 20:02 dev_id
  -r--r--r-- 1 root root 4096 Apr 19 20:02 dev_port
  lrwxrwxrwx 1 root root    0 Apr 19 20:02 device -> ../../../virtio1/
  -r--r--r-- 1 root root 4096 Apr 19 20:02 dormant
  -r--r--r-- 1 root root 4096 Apr 19 20:02 duplex
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 flags
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 gro_flush_timeout
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 ifalias
  -r--r--r-- 1 root root 4096 Apr 19 20:02 ifindex
  -r--r--r-- 1 root root 4096 Apr 19 20:02 iflink
  -r--r--r-- 1 root root 4096 Apr 19 20:02 link_mode
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 mtu
  -r--r--r-- 1 root root 4096 Apr 19 20:02 name_assign_type
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 netdev_group
  -r--r--r-- 1 root root 4096 Apr 19 20:02 operstate
  -r--r--r-- 1 root root 4096 Apr 19 20:02 phys_port_id
  -r--r--r-- 1 root root 4096 Apr 19 20:02 phys_port_name
  -r--r--r-- 1 root root 4096 Apr 19 20:02 phys_switch_id
  drwxr-xr-x 2 root root    0 Apr 19 20:02 power/
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 proto_down
  drwxr-xr-x 4 root root    0 Apr 19 20:02 queues/
  -r--r--r-- 1 root root 4096 Apr 19 20:02 speed
  drwxr-xr-x 2 root root    0 Apr 19 20:02 statistics/
  lrwxrwxrwx 1 root root    0 Apr 19 20:02 subsystem -> ../../../../../../../class/net/
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 tx_queue_len
  -r--r--r-- 1 root root 4096 Apr 19 20:02 type
  -rw-r--r-- 1 root root 4096 Apr 19 20:02 uevent
  hwe@s1lp9g003:/sys/class/net/eth0$ sudo cat speed
  cat: speed: Invalid argument
  hwe@s1lp9g003:/sys/class/net/eth0$ sudo su
  root@s1lp9g003:/sys/devices/css0/0.0.0001/0.0.0001/virtio1/net/eth0# cat speed
  cat: speed: Invalid argument

  So on zKVM even root is not able to view the current link speed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-generic 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic s390x
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  Date: Tue Apr 19 22:58:52 2016
  HibernationDevice: RESUME=UUID=7ddabd20-1d15-492c-bcd5-ec2dbb16b777
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=b732515f-dacf-4007-85af-a27b5bf48fdf crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=7ddabd20-1d15-492c-bcd5-ec2dbb16b777
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=b732515f-dacf-4007-85af-a27b5bf48fdf crashkernel=196M BOOT_IMAGE=0
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.4.0-18-generic s390x
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom cpacfstats dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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