On Wed, 2018-09-05 at 13:17 +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 <tone.zh...@arm.com> > --- > 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..b46fc6a 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 disabled. One can add > ``intel_iommu=off`` or > + ``intel_iommu=pt`` or ``amd_iommu=off`` 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: Luca Boccassi <bl...@debian.org> -- Kind regards, Luca Boccassi
