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This was discovered during certification testing of 16.04.4 (I've now
seen this behaviour at least 2 times)
A system under test has a 2 port Intel X550 NIC (10Gb)
Udev reports the NIC as this:
Category: NETWORK
Interface: enp94s0f0
Product: Ethernet Controller 10G X550T
Vendor: Intel Corporation
Driver: ixgbe (ver: 5.1.0-k)
Path: /devices/pci0000:5d/0000:5d:00.0/0000:5e:00.0
ID: [8086:1563]
Subsystem ID: [152d:8a13]
Ethtool shows this info (this is for the second port, which has the issue)
Settings for enp94s0f1:
Supported ports: [ TP ]
Supported link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 10000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: umbg
Wake-on: g
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
Note ethtool shows an active 10Gb link.
The test tool determines the NIC speed by introspecting the sysfs data
for each NIC port. In this case, by looking at
/sys/class/net/DEVICENAME/speed
I've now seen this on a couple different NICs using the ixgbe driver.
The first port will properly show connected link speed in
/sys/class/net/DEVICENAME/speed but the second port shows -1 in that
file.
Because of this, certification tests are failing because the tool
believes that the link speed is incorrect.
This current example is using kernel 4.13.0-37.42~16.04.1
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: blocks-hwcert-server bot-comment
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Intel NICs not properly reporting link speed in SysFS in Xenial
https://bugs.launchpad.net/bugs/1757191
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