Yes, the ixv code was specifically written to work in a guest with SRIOV,
however
our internal testing did not use DHCP, what if you assign it an address,
will it work
then?

Jack



On Sun, Dec 1, 2013 at 8:10 PM, Colin Percival <cperc...@freebsd.org> wrote:

> Hi Xen people & jfv,
>
> Amazon's new "C3" instance type has support for SR-IOV using ixgbe
> hardware;
> our driver looks like it should support this, but when I turn it on it
> doesn't
> seem to work.  Boot dmesg: http://pastebin.com/1Kkpfzbi
>
> The virtual hardware is recognized:
> > ix0: <Intel(R) PRO/10GbE Virtual Function Network Driver, Version -
> 1.1.4> mem 0xf3000000-0xf3003fff,0xf3004000-0xf3007fff at device 3.0 on pci0
> > ix0: Using MSIX interrupts with 2 vectors
> > ix0: Ethernet address: 02:91:23:76:38:77
>
> And we seem to be able to send packets, but never see any responses:
> > ix0: link state changed to UP
> > Starting Network: lo0 ix0.
> > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
> >         options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
> >         inet6 ::1 prefixlen 128
> >         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
> >         inet 127.0.0.1 netmask 0xff000000
> >         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> > ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >
> options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
> >         ether 02:91:23:76:38:77
> >         nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> >         media: Ethernet autoselect
> >         status: active
> > Starting devd.
> > Starting dhclient.
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 8
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 12
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 12
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 9
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 10
> > DHCPDISCOVER on ix0 to 255.255.255.255 port 67 interval 10
> > No DHCPOFFERS received.
>
> Under exactly the same Xen configuration except with SR-IOV turned off and
> EC2 presenting a Xen netback to us instead, the DHCP works just fine.
>
> Has anyone managed to use {FreeBSD, SR-IOV, ixgbe, Xen}?  Was any magic
> necessary in order to make it work?
>
> --
> Colin Percival
> Security Officer Emeritus, FreeBSD | The power to serve
> Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
>
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