From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50839) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cEcsX-0000S0-AO for qemu-devel@nongnu.org; Wed, 07 Dec 2016 09:07:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cEcsT-0006Vu-H8 for qemu-devel@nongnu.org; Wed, 07 Dec 2016 09:07:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58926) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cEcsT-0006Uy-BU for qemu-devel@nongnu.org; Wed, 07 Dec 2016 09:07:21 -0500 Date: Wed, 7 Dec 2016 14:07:15 +0000 From: "Daniel P. Berrange" Message-ID: <20161207140715.GB1476@redhat.com> Reply-To: "Daniel P. Berrange" References: <20161207120419.GA1476@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] qemu -netdev tun/tap support can't handle macvtap type devices List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Maydell Cc: QEMU Developers , Jason Wang On Wed, Dec 07, 2016 at 12:30:31PM +0000, Peter Maydell wrote: > On 7 December 2016 at 12:04, Daniel P. Berrange 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/ :|