Hello Bruce, Thanks for the comments.
I will update the change and issue v5 soon. Thanks! Br, Tone -----Original Message----- From: Bruce Richardson <[email protected]> Sent: Friday, September 21, 2018 7:20 PM To: Tone Zhang (Arm Technology China) <[email protected]> Cc: [email protected]; Gavin Hu (Arm Technology China) <[email protected]>; [email protected]; [email protected]; Honnappa Nagarahalli <[email protected]>; nd <[email protected]> Subject: Re: [PATCH v4] doc: Clarify IOMMU usage with "uio_pci_generic" kernel module On Fri, Sep 21, 2018 at 11:07:42AM +0800, tone.zhang wrote: > If the devices used for DPDK are bound to the "uio_pci_generic" kernel > module, the IOMMU should be disabled in order not to break the IO > transmission because of the virtual / physical address mapping. > > The patch clarifies the IOMMU configurations on both x86_64 and arm64 > systems. > > Signed-off-by: tone.zhang <[email protected]> > --- > doc/guides/linux_gsg/linux_drivers.rst | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/doc/guides/linux_gsg/linux_drivers.rst > b/doc/guides/linux_gsg/linux_drivers.rst > index 371a817..3304800 100644 > --- a/doc/guides/linux_gsg/linux_drivers.rst > +++ b/doc/guides/linux_gsg/linux_drivers.rst > @@ -48,6 +48,13 @@ be loaded as shown below: > ``vfio-pci`` kernel module rather than ``igb_uio`` or ``uio_pci_generic``. > For more details see :ref:`linux_gsg_binding_kernel` below. > > +.. note:: > + > + If the devices used for DPDK are bound to the ``uio_pci_generic`` kernel > module, > + please make sure that the IOMMU is disabledi or passthrough. One > + can add typo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ > + ``intel_iommu=off`` or ``amd_iommu=off`` or ``intel_iommu=on iommu=pt``in > GRUB > + command line on x86_64 systems, or add ``iommu.passthrough=1`` on arm64 > system. > + > Since DPDK release 1.7 onward provides VFIO support, use of UIO is > optional for platforms that support using VFIO. > Acked-by: Bruce Richardson <[email protected]>
