On Wed, Dec 07, 2016 at 12:30:31PM +0000, Peter Maydell wrote: > On 7 December 2016 at 12:04, Daniel P. Berrange <berra...@redhat.com> wrote: > > On Wed, Dec 07, 2016 at 12:01:14PM +0000, Peter Maydell wrote: > >> The usual suggested workaround is to use the -netdev fd option, like > >> fd=3 3<>/dev/tap$(< /sys/class/net/tap0/ifindex) > >> (which gets the shell to open the right /dev/tap device). > >> Unfortunately this isn't compatible with multi-queue support > >> because netdev complains > >> "ifname=, script=, downscript=, vnet_hdr=, helper=, queues=, fds=, > >> and vhostfds= are invalid with fd=" > >> so you can't pass options like "queues=4"... > > > > FWIW you should be able to instead do > > > > fds=3 3<>/dev/tap$(< /sys/class/net/tap0/ifindex) > > > > note 'fds' plural, instead of 'fd' > > What's the difference between that and the "usual suggested workaround" > I described above that doesn't work with queues=... ?
It just seems the 'queues' param always wants you to use 'fds' instead of 'fd' - 'fds' takes a comma-separated list of FDs - one per queue and 'fd' only takes a single FD. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://entangle-photo.org -o- http://search.cpan.org/~danberr/ :|