SIOCSVH, SIOCGVH ioctl(2) and virtio ethernet driver

[Oleg Ginzburg]

On Monday 29 December 2014 14:18:01 Bryan Venteicher wrote:
> On Fri, Dec 26, 2014 at 8:09 AM, Oleg Ginzburg <olevole at olevole.ru> wrote:
> > is it possible to use the carp(4) protocol with
> > vtnet(4) interfaces ( which is used, for example, in bhyve(8) )
> > Currently, the standard carp init operation causes an SIOCGVH error:
> > 
> > /sbin/ifconfig vtnet0 vhid 1 advskew 100 pass pass 10.10.10.10/24 alias
> > ifconfig: SIOCGVH: Protocol not supported
> 
> You probably don't have the carp(4) module loaded.

Sorry for delay.

Unfortunately the problem somewhere else. Depending on the FreeBSD revision 
there is a different behavior except usual. E.g:

a) 10.1-RELEASE and 10-STABLE:

% kldload carp
% kldstat -m carp
Id  Refs Name
486    1 carp

% /sbin/ifconfig vtnet0 vhid 1 advskew 100 pass navuhodonosor 192.168.1.210/24 
state master alias
ifconfig: SIOCSVH: Invalid argument


b) On FreeBSD-current r276500M CARP IP is established for some seconds, then 
vanishes:

% /sbin/ifconfig vtnet0 vhid 1 advskew 100 pass navuhodonosor 192.168.1.210/24 
state master alias
% ifconfig vtnet0
vtnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 
1500
        options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
        ether 00:a0:98:d7:e3:65
        inet 192.168.1.170 netmask 0xffffff00 broadcast 192.168.1.255 
        inet 192.168.1.210 netmask 0xffffff00 broadcast 192.168.1.255 vhid 1 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet 10Gbase-T <full-duplex>
        status: active
        carp: BACKUP vhid 1 advbase 1 advskew 100

% ifconfig vtnet0
vtnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 
1500
        options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
        ether 00:a0:98:d7:e3:65
        inet 192.168.1.170 netmask 0xffffff00 broadcast 192.168.1.255 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet 10Gbase-T <full-duplex>
        status: active

% dmesg
...
carp_alloc_if: ifpromisc(vtnet0) failed: 45
carp: VHID 1 at vtnet0: INIT -> BACKUP
carp: VHID 1 at vtnet0: BACKUP -> MASTER (master down)
ifa_del_loopback_route: deletion failed: 3
ifa_del_loopback_route: deletion failed: 3


And one more dmesg from the server with more fresher revision (r280012M):

carp_alloc_if: ifpromisc(vtnet0) failed: 45
carp: 1 at vtnet0: INIT -> BACKUP (initialization complete)
carp: 1 at vtnet0: BACKUP -> MASTER (master timed out)



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