On Thu, Jan 17, 2013 at 09:39:54AM +0100, Stefan Hajnoczi wrote: > On Thu, Jan 17, 2013 at 01:45:11PM +0800, Amos Kong wrote: > > On Thu, Jan 17, 2013 at 11:49:20AM +1030, Rusty Russell wrote: > > > akong@xxxxxxxxxx writes: > > > > @@ -349,6 +351,14 @@ static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, > > > > { > > > > struct virtio_net_ctrl_mac mac_data; > > > > > > > > + if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET && elem->out_num == 2 && > > > > + elem->out_sg[1].iov_len == ETH_ALEN) { > > > > + /* Set MAC address */ > > > > + memcpy(n->mac, elem->out_sg[1].iov_base, elem->out_sg[1].iov_len); > > > > + qemu_format_nic_info_str(&n->nic->nc, n->mac); > > > > + return VIRTIO_NET_OK; > > > > + } > > > > > > Does the rest of the net device still rely on the layout of descriptors? > > > > No, only info string of net client relies on n->mac > > I think the question is whether the hw/virtio-net.c code makes > assumptions about virtqueue descriptor layout (e.g. sg[0] is the header, > sg[1] is the data buffer). > > The answer is yes, the control virtqueue function directly accesses > iov[n]. > > Additional patches would be required to convert the existing > hw/virtio-net.c code to make no assumptions about virtqueue descriptor > layout. It's outside the scope of this series. > > Stefan It's not hard at all though - the harder part is data path processing, this has been done already. Will send a patch shortly. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html