[Bug 209427] if_vtnet(4) is not sending LINK_(UP|DOWN) events

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209427

Roman Bogorodskiy <novel at FreeBSD.org> changed:

           What    |Removed                     |Added
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 Attachment #170183|0                           |1
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--- Comment #2 from Roman Bogorodskiy <novel at FreeBSD.org> ---
Created attachment 170409
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170409&action=edit
proposed fix, v2

Attaching a new patch that's slightly less dirty than the previous one.

Specifically, it does not change vtnet_is_link_up() behavior, but extends
vtnet_update_link_status() event triggering.

Specifically, if link is here and IFF_DRV_RUNNING is set, but interface was not
active, we mark it active and trigger notification. If there is no link or
IFF_DRV_RUNNING, then we consider interface down.

Also, add a call to vtnet_update_link_status() on mtu change to trigger events
as well like other if drivers usually do.

So, a pair of ifconfig vtnet0 down/up followed by ifconfig vtnet0 mtu 1496 look
like this in devd:

!system=IFNET subsystem=vtnet0 type=LINK_DOWN
!system=IFNET subsystem=vtnet0 type=LINK_UP
!system=IFNET subsystem=vtnet0 type=LINK_DOWN
!system=IFNET subsystem=vtnet0 type=LINK_UP
!system=IFNET subsystem=vtnet0 type=LINK_DOWN
!system=IFNET subsystem=vtnet0 type=LINK_UP

I'm yet to figure out how I can test link status change in bhyve so
vtnet_is_link_up() returned something other that 1.

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