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[Bug 1513980] [NEW] Ubuntu 14.04.03 did not detect Link down on Houston CU network adapter ports when cable pulled

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From: Launchpad Bug Tracker <1513980@xxxxxxxxxxxxxxxxxx>
Date: Fri, 06 Nov 2015 22:14:08 -0000
Reply-to: Bug 1513980 <1513980@xxxxxxxxxxxxxxxxxx>
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Problem Description:
====================

I installed Houston CU (feature code 2CC1) PCIe2 10GbE SFP+ CU 4-port
Converged Network Adapter in slot P1-C2 of tul117fp1 system. The system
is configured as PowerNV and running Ubuntu 14.04.03

- I configured 2 copper ports of the adapter and running network stress
on it for several hours. I then pulled cable and waited for sometime.

- The OS did not detect the link down. Even though the TX/RX traffic
stopped on the ports.

- Kernel log and dmesg did not have any entry to indicate link down
after cable pulled.

0007:00:00.0 PCI bridge: IBM Device 03dc
0007:01:00.0 Ethernet controller: Emulex Corporation OneConnect NIC (Lancer) (rev 10)
0007:01:00.1 Ethernet controller: Emulex Corporation OneConnect NIC (Lancer) (rev 10)
0007:01:00.2 Ethernet controller: Emulex Corporation OneConnect NIC (Lancer) (rev 10)
0007:01:00.3 Ethernet controller: Emulex Corporation OneConnect NIC (Lancer) (rev 10)
0007:01:00.4 Fibre Channel: Emulex Corporation OneConnect FCoE Initiator (Lancer) (rev 10)
0007:01:00.5 Fibre Channel: Emulex Corporation OneConnect FCoE Initiator (Lancer) (rev 10)

- ifconfig -a cmd still show link up

eth43     Link encap:Ethernet  HWaddr 00:90:fa:6e:e0:f2  
          inet addr:103.1.1.15  Bcast:103.1.1.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:7543074880 errors:1 dropped:9 overruns:0 frame:1
          TX packets:5926170683 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:8997647070924 (8.9 TB)  TX bytes:7177651764733 (7.1 TB)

eth44     Link encap:Ethernet  HWaddr 00:90:fa:6e:e0:f3  
          inet addr:103.1.2.15  Bcast:103.1.2.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:5926170613 errors:1 dropped:0 overruns:0 frame:1
          TX packets:7543089239 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7488707854629 (7.4 TB)  TX bytes:8619256135370 (8.6 TB)

Paul, looking at the source code for the driver in Ubuntu 14.04.3 the
driver doesn't log any messages after an update to the link status.

The following commit upstream adds this functionality:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=18824894dbec3eb2202fc92d52a0c8bd27c8a63f

I'll create a test kernel with this patch applied and will attach it
here so you can test this commit

- I installed Ubuntu patched kernel

- I setup and re-ran the test on Houston adapter. I verified that with
the patch link Up/Down events now get logged properly when cable pulls.

I verified the patch and it fixed the problem

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Canonical Kernel Team (canonical-kernel-team)
         Status: Triaged


** Tags: architecture-ppc64le bugnameltc-127514 severity-high targetmilestone-inin14043
-- 
Ubuntu 14.04.03 did not detect Link down on Houston CU network adapter ports when cable pulled
https://bugs.launchpad.net/bugs/1513980
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