Hi, On 08.12.2015 18:42, Tantilov, Emil S wrote:
>> -----Original Message----- >> From: Peter Schmitt [mailto:p.schmitt...@gmx.net] >> Sent: Tuesday, December 08, 2015 8:02 AM >> To: e1000-devel@lists.sourceforge.net >> Subject: [E1000-devel] IXGBE X520-DA2 82599ES SFP+ DA Is carrier detection >> working? >> >> 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. > Is the device and driver on the "other box" the same? Yes, the NICs are identical and the software is also the same. The same Linux kernel and ixgbe versions: Linux 4.1.13 x86_64 and ixgbe 4.0.1-k. >> 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. > The driver shuts off the laser for SFP+ modules and can power down the PHY > on copper parts, but that probably won't happen on DA copper cable. Ok, so it is a hardware problem? The driver cannot enable proper carrier detection when using DA copper cables? > When you bring down the interface on the other end - if you still see the > LINK LED of the NIC to be lit then the driver is reporting the status > correctly. When the DA copper cable is connected, the LED is always on on both machines. Even if the interface is turned down in Linux. When I switch to fibre, the LED is off on both machines as soon as I set one interface down. Thank you very much for your answer! > Thanks, > Emil > ------------------------------------------------------------------------------ _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
