[Bug 241737] [patch] cannot use the tap interface name to build a VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241737

            Bug ID: 241737
           Summary: [patch] cannot use the tap interface name to build a
                    VM
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: fabien.costard at free.fr

Created attachment 208881
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208881&action=edit
modification on pci_virtio_net.c

Hi,
If a tap interface is created with a name, it is not possible to start a VM
with bhyve using this name. We must use the device name.

For example, I create this interface (sysctl is correctly configured to use
tap):
ifconfig tap create name port1

when I launch the VM (after loaded it for sure)
bhyve -c 1 -m 256 -A -H -P -s 0:0,hostbridge -s 1,virtio-net,port1 -s 2:0
virtio-blk,/root/rFreeBSD.img -s 31,lpc -l com1,/dev/nmdm0A rFreeBSD

The network will not work because the command is only develop to check device
in /dev/.

I add some code to check if the name matches with a interface and replace it to
create the virtual interface

I hope I was enough clear and my code not too ugly

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