[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 #30 from Kevin Bowling <[email protected]> ---
(In reply to Zhenlei Huang from comment #29)
I'm not actually aware of anything that /requires/ adapter re-init, i.e. the
main issue in e1000 was fixed 5 years ago in
2796f7cab10785ef40efbba97ef67ab319c96e9c and some other minor fixes following
that in similar timeframe.

CSUM and vlan tagging are all mbuf related runtime decisions and needn't a
restart.  I think even TSO could be hitless for e1000.  MTU would be out of
scope as it changes hardware and software sizes, but it also has its own ioctl.

iflib's SIOCSIFCAP should be adapted to consult the existing interface
"ifdi_needs_restart" and the flag set should be expanded to various IFCAPs.

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