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

Xie, Huawei huawei.xie at intel.com
Tue Jan 12 06:16:58 CET 2016

On 1/12/2016 12:24 PM, Santosh Shukla wrote:
> 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.
Thanks. Here is the patch: http://www.dpdk.org/dev/patchwork/patch/9720/

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