Hi everyone,
I am connecting two boxes using X520-DA2 82599ES 10-Gigabit SFI/SFP+
NICs and the ixgbe
driver in Linux. Those cards have two SFP+ ports. If I connect a Direct
Attach Copper cable, the carrier detection does not work correctly. As
soon as
the device in Linux is up, there is a carrier and it doesn't matter if the
device on the other box is up or down.
If I use Fibre and an SR module, the carrier detection works flawless. The
interface detects a carrier if the interface on the other box is up and
doesn't if the interface is down.
Is carrier detection properly supported with Direct Attach Copper or am I
missing something here?
To reproduce the issue:
Connect Direct Attach cable between box1 eth0 and box2 eth0.
box1: ip link set dev eth0 up
box2: ip link set dev eth0 down
Result: box1 shows carrier on eth0
Expected: box1 does not show carrier
Connect Fibre cable and SR modules between box1 eth0 and box2 eth0.
box1: ip link set dev eth0 up
box2: ip link set dev eth0 down
Result: box1 does not show a carrier on eth0
box2: ip link set dev eth0 up
Result: box1 shows a carrier on eth0
I am using Linux 4.1.13-x86_64
> ethtool -i eth0
driver: ixgbe
version: 4.0.1-k
firmware-version: 0x61c10001
bus-info: 0000:81:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
eth0 with DA cable:
> ethtool eth0
Settings for eth0:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: No
Advertised link modes: 10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: Direct Attach Copper
PHYAD: 0
Transceiver: external
Auto-negotiation: off
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
eth0 with SR and Fibre state up:
> ethtool eth0
Settings for eth0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 1000baseT/Full
10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: external
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
eth0 with SR and Fibre state down:
> ethtool eth0
Settings for eth0:
Supported ports: [ FIBRE ]
Supported link modes: 1000baseT/Full
10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 1000baseT/Full
10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: Unknown!
Duplex: Unknown! (255)
Port: FIBRE
PHYAD: 0
Transceiver: external
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: no
I'm glad if you can point me in any direction if I'm missing something here.
If you need any further information or need me to do some tests, please ask.
Thank you in advance,
Peter
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