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Date:      Tue, 17 May 2016 15:14:49 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-virtualization@FreeBSD.org
Subject:   [Bug 209427] if_vtnet(4) is not sending LINK_(UP|DOWN) events
Message-ID:  <bug-209427-27103-E2qX0it0zH@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-209427-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-209427-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209427

Roman Bogorodskiy <novel@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #170183|0                           |1
        is obsolete|                            |

--- Comment #2 from Roman Bogorodskiy <novel@FreeBSD.org> ---
Created attachment 170409
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D170409&action=
=3Dedit
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 eve=
nts
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=3DIFNET subsystem=3Dvtnet0 type=3DLINK_DOWN
!system=3DIFNET subsystem=3Dvtnet0 type=3DLINK_UP
!system=3DIFNET subsystem=3Dvtnet0 type=3DLINK_DOWN
!system=3DIFNET subsystem=3Dvtnet0 type=3DLINK_UP
!system=3DIFNET subsystem=3Dvtnet0 type=3DLINK_DOWN
!system=3DIFNET subsystem=3Dvtnet0 type=3DLINK_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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