[Bug 221317] Netmap issue after ixgbe driver update in r320897

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221317

Stephen Hurd <shurd at FreeBSD.org> changed:

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--- Comment #28 from Stephen Hurd <shurd at FreeBSD.org> ---
Created attachment 192505
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192505&action=edit
Additional debugging in ixgbe_stop()

This patch won't solve the problem, but it will log errors encountered in
ixgbe_stop() if any.

If there are no errors logged in dmesg, I'm curious if that delay needs to be
at the beginning of the call to stop, or if it can be moved to just before the
init_locked() call.

If there's an error, possibly just retrying after a short delay will help, but
if not, I'll see if I can get an 11-STABLE system up and running this weekend.

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