[Bug 280074] em(4) temporarily hangs and re-enables TX CSUM if a bridge it's a member of is modified

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280074

--- Comment #26 from Joshua Kinard <[email protected]> ---
(In reply to Zhenlei Huang from comment #23)
Nope, this particular device is on 15.0.  I have two other devices using
igb(4), but again, the external ports driver for it, net/intel-igb-kmod.  I can
maybe try putting one of them on the in-tree driver and see if it has the same
hiccup as em(4) on my NUC8.  I also have a third appliance that also uses
em(4), but with a different hardware chip than the NUC (which is on a I219-V);
however, it doesn't run any jails.  I can set a dummy jail up on it and see if
it has the same hiccup, because that could highlight if it's a hardware quirk
with certain Intel chipsets.

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