***UNCHECKED*** Re: about virtio driver porting from FreeBSD

Stéphanie Ouillon stephanie at minet.net
Sun Mar 13 15:55:21 PDT 2011

    I run 10 days ago the code you sent to me in your mail, but I had to
    read more about virtio driver to be able to understand a bit more
    the architecture of the code.
    Well, I used a DragonFly 2.9-development on Virtualbox (not the
    latest version of VBox because there is a reported bug for DragonFly
    BSD machines, so I use the 3.12) and I used a PCnet-PCI II emulated
    network card (NAT mode).
    I build the code to load the modules and I did what you mentionned :
    #kldload -v ./virtio.ko
      virtio_probe 51966virtio_probe 9237virtio_probe 28947Loaded
      ./virtio.ko, id=5
      #kldload -v ./virtio_net.ko
      Loaded ./virtio-net.ko, id=6
      virtio_probe 51966virtio_probe 9237virtio_probe 28947
    I checked the numbers, they match the following devices : 
    51966 : Virtual Guest Service
    9237 : "0x8086","0x2415","Intel Corporation","Intel 82801DBM SM/BUS
    Controller 24C3","Aureal (AD1881 SOUNDMAX) Placa Mãe Asaki P3-141"
    28947: "0x8086","0x7113","Intel
    Corporation","82371AB/EB/MB","PIIX4/4E/4M Power Management
    However, I see no message from the virtio_attach() fonction nor
    virtio_net_probe() or virtio_net_attach() and I don't understand why
    ( if it is normal, or not ? ).
    I tried to launch Virtualbox with virtio-net for the network
    configuration to see what would happen, if I could go further and
    have more information but I had an error message at the very
    beginning :
    Configuration error:
      Failed to get the "MAC" value (VERR_CFGM_VALUE_NOT_FOUND).
      Unknown error creating VM (VERR_CFGM_VALUE_NOT_FOUND).
    So the vm couldn't be launched, even when configured with no network
    Stéphanie Ouillon
    Le 28/02/11 02:34, Pratyush Kshirsagar a écrit :
      type="cite">Yes, you are right but I did some work porting virtio
      network driver from NetBSD before we moved forward to port it from
      Attached is the partly done code.
        The other basic calls needed for block and network drivers are
        kept same by Tim and me so that we don't do lot of cleaning and
        book keeping stuff.
      The working code is in "net" directory and not the nbsd_code.
      you need to make the outer dir and then the do make in net.
      use kldload -v ./virtio.ko followed by kldload -v
      Thus when you use dmesg it will show the messages during the
        netword device probe and attach() with the network device
      You can mail me for further information.
      - Pratyush Kshirsagar.
        2011/2/27 Stéphanie Ouillon <span
            dir="ltr"><<a moz-do-not-send="true"
              href="mailto:stephanie at minet.net" target="_blank">stephanie at minet.net>
          <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
            0.8ex; border-left: 1px solid rgb(204, 204, 204);
            padding-left: 1ex;">
            I've read the posts on the DragonFly BSD Digest site about
            virtio, but I have some questions about it.
            A virtual network driver was ported from NetBSD, using some
            FreeBSD code that wasn't supposed to be public under a BSD
            license. So for the moment, the code that is published on
            gitorious (<a moz-do-not-send="true"
            can't be used at all ? Can somebody tell me more about that
            Thanks !

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