Why did interfaces using 'enic' drivers get disabled with errors and loose connectivity?

Solution Verified - Updated -

Issue

  • Cisco USC server with using Red Hat genuine enic drivers faced connectivity issue. /var/log/messages were having below errors at the time of issue.
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 20 timed out
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: vNIC soft reset failed, err -110
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 36 timed out
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 21 timed out
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: Failed to alloc notify buffer, aborting.
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 4 timed out
Jun 13 02:07:57 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 4 timed out
Jun 13 02:08:46 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd 4 timed out
[...]
Jun 13 02:16:46 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd2 4: wq is full. fetch index: 0, posted index: 31
Jun 13 02:17:46 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd2 4: wq is full. fetch index: 0, posted index: 31
Jun 13 02:18:46 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd2 4: wq is full. fetch index: 0, posted index: 31
Jun 13 02:19:46 HOSTNAME kernel: enic 0000:05:00.0: eth0: devcmd2 4: wq is full. fetch index: 0, posted index: 31
  • Need to know the reason for above messages and loss of connectivity.

Environment

  • Red Hat Enterprise Linux 6.8
  • Cisco UCS server
  • enic driver version 2.3.0.12
  • NIC firmware version 4.0(8c)

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