[Bug 234838] ena drop-outs on 12.0-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234838

            Bug ID: 234838
           Summary: ena drop-outs on 12.0-RELEASE
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: leif at ofWilsonCreek.com

We're observing problems with the ena driver on AWS in 12.0-RELEASE. We see
these kernel messages a few times per day, and not surprisingly, the NIC
appears to quit working for a few minutes and then recover. (We see this
because our Nagios instance alarms and then recovers.) This particular instance
is an r4.large.

ena_com_prepare_tx() [TID:100766]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100766]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100378]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100376]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100844]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100765]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100363]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100523]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: Keep alive watchdog timeout.
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: device is going UP
ena0: link is UP
ena_com_prepare_tx() [TID:100401]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100477]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100634]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: Keep alive watchdog timeout.
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: free uncompleted tx mbuf qid 0 idx 0xb9ena0: ena0: device is going UP
link is UP
ena0: Keep alive watchdog timeout.
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: device is going UP
ena0: link is UP
ena_com_prepare_tx() [TID:100360]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100587]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100365]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: The number of lost tx completion is above the threshold (129 > 128).
Reset the device
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: free uncompleted tx mbuf qid 1 idx 0x2bbena0: device is going UP
ena0: link is UP
ena_com_prepare_tx() [TID:100375]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100892]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: The number of lost tx completion is above the threshold (129 > 128).
Reset the device
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: free uncompleted tx mbuf qid 0 idx 0x234ena0: ena0: device is going UP
link is UP
ena_com_prepare_tx() [TID:100365]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena_com_prepare_tx() [TID:100832]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: The number of lost tx completion is above the threshold (129 > 128).
Reset the device
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: free uncompleted tx mbuf qid 1 idx 0xf5ena0: ena0: device is going UP
link is UP
ena_com_prepare_tx() [TID:100474]: Not enough space in the tx queue

ena0: failed to prepare tx bufs
ena0: Keep alive watchdog timeout.
ena0: Trigger reset is on
ena0: device is going DOWN
ena0: device is going UP
ena0: link is UP

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