On 11/20/19 8:26 PM, Jason Wang wrote: > > On 2019/11/21 上午1:52, David Ahern wrote: >> Hi: >> >> Trying to load an XDP program on a virtio based nic is failing with: >> >> virtio_net: XDP expects header/data in single page, any_header_sg >> required >> >> I have not encountered this error before and not able to find what is >> missing. Any tips? > > > Hi David: > > What qemu + guest kernel version did you use? And could you share you > qemu cli? > > Old qemu requires vnet header to be placed into a separate sg which > breaks the assumption of XDP. Recent qemu doesn't have such limitation > (any_header_sg feature). > > Hi Jason, When I run qemu via my older vm-tools scripts XDP works fine. This is the first time I am trying to use XDP with guests started by libvirt. We isolated it to a libvirt xml file using an old machine type (pc-i440fx-1.5) - basically any machine with VIRTIO_F_VERSION_1 not set. Using a newer one move the problem forward. The current error message is: virtio_net: Too few free TX rings available again, looking for some libvirt setting for the vm create.
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