[dpdk-dev] [PATCH v2 0/4] fix the issue that DPDK takes over virtio device blindly

[Santosh Shukla]

On Tue, Jan 12, 2016 at 8:32 AM, Xie, Huawei <huawei.xie at intel.com> wrote:
>
> On 1/5/2016 1:25 AM, Stephen Hemminger wrote:
> > On Mon,  4 Jan 2016 01:56:09 +0800
> > Huawei Xie <huawei.xie at intel.com> wrote:
> >
> >> v2 changes:
> >>  Remove unnecessary assignment of NULL to dev->data->mac_addrs
> >>  Ajust one comment's position
> >>  change LOG level from ERR to INFO
> >>
> >> virtio PMD doesn't set RTE_PCI_DRV_NEED_MAPPING in drv_flags of its
> >> eth_driver. It will try igb_uio and PORT IO in turn to configure
> >> virtio device. Even user in guest VM doesn't want to use virtio for
> >> DPDK, virtio PMD will take over the device blindly.
> >>
> >> The more serious problem is kernel driver is still manipulating the
> >> device, which causes driver conflict.
> >>
> >> This patch checks if there is any kernel driver manipulating the
> >> virtio device before virtio PMD uses port IO to configure the device.
> >>
> >> Huawei Xie (4):
> >>   eal: make the comment more accurate
> >>   eal: set kdrv to RTE_KDRV_NONE if kernel driver isn't manipulating the device.
> >>   virtio: return 1 to tell the kernel we don't take over this device
> >>   virtio: check if any kernel driver is manipulating the virtio device
> >>
> >>  drivers/net/virtio/virtio_ethdev.c     | 16 ++++++++++++++--
> >>  lib/librte_eal/common/eal_common_pci.c |  8 ++++----
> >>  lib/librte_eal/linuxapp/eal/eal_pci.c  |  2 +-
> >>  3 files changed, 19 insertions(+), 7 deletions(-)
> >>
> > Overall looks good, thanks for addressing this.
> >
> > It would be good to note that VFIO no-IOMMU mode should work for this
> > as well.
>
> It isn't implemented yet in virtio PMD. I could add a note in the commit
> message. Do you plan to implement this?
>

I can send vfio-noiommu patches for this one, as I am looking at
vfio-noiommu for virtio  for my arm v4 patch series. Stephen, let me
know if you already started working on this?

Also for some reason I can't find [3/4] patch, could you point me to
patch link? Thanks.
>
> >
>