[Bug 281560] gve (4) uma deadlock during high tcp throughput

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281560

--- Comment #23 from [email protected] ---
(In reply to Mark Johnston from comment #22)

Yup gve_xmit_br enqueueing itself is the problem. Since the cleanup task
gve_tx_cleanup_tq already runs off of interrupts, I am thinking of fixing this
by having gve_xmit_br marking itself as stopped when it sees ENOBUFS and the
cleanup thread wake it up when room is made.

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