On Tue, Feb 19, 2013 at 09:53:07AM +0100, Markus Armbruster wrote: > Stefan Hajnoczi <stefa...@redhat.com> writes: > > > On Tue, Feb 19, 2013 at 12:37:28PM +1100, Alexey Kardashevskiy wrote: > >> On 14/02/13 21:26, Stefan Hajnoczi wrote: > >> > >> >>>>Now I want to enable network dump. With the old "-net" syntax I could > >> >>>>do > >> >>>>that with "-net dump" but I cannot with the new syntax, tried many > >> >>>>variants, none works. What would the correct syntax be for the case > >> >>>>above? > >> > >> The question was about new "-netdev" interface. > >> > >> >I would do: > >> > > >> >qemu-system-ppc64 ... > >> > -net tap,ifname=tap0,script=qemu-ifup.sh > >> > -net nic,model=virtio > >> > -net dump,file=./dump.lan.qemu.virtio > >> > > >> > >> The answer is about old "-net" interface which I know how to use. > >> > >> Does this mean that there is no way to use "dump" with "-netdev tap"? > > > > It is not possible using just -netdev/-device. The closest you can get > > is: > > > > $ qemu -netdev hubport,hubid=1,id=hubport0 \ > > -device virtio-net-pci,netdev=hubport0,... \ > > -net tap,vlan=1,... \ > > -net dump,vlan=1,... > > Care to explain briefly how hubport works, and how it's connected to the > legacy "vlan" feature?
-netdev hubport instantiates a new port on a hub with "vlan" number hubid=<number>. hubport is a -netdev, so it allows you to hook up a NIC to a hub using -netdev/-device syntax. This is just playing games with syntax, we still have a hub in between the virtio-net-pci, tap, and dump devices. I didn't check if the offload features get plumbed through, but I wouldn't count on it. Stefan
