[Bug 225791] ena driver causing kernel panics on AWS EC2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225791

--- Comment #31 from Leif Pedersen <leif at ofWilsonCreek.com> ---
ena in 12.0-RELEASE is still not stable on AWS. We see these kernel messages a
few times per day:

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

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