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doc: clarify IOMMU disabling for uio_pci_generic

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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.zhang@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Reviewed-by: Rami Rosen <roszenrami@gmail.com>
Acked-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Luca Boccassi <bluca@debian.org>
This commit is contained in:
Tone Zhang 2018-09-26 13:08:47 +08:00 committed by Thomas Monjalon
parent 8c58f1b837
commit 2eb7c526b9
1 changed files with 7 additions and 0 deletions
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7
doc/guides/linux_gsg/linux_drivers.rst
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@ -48,6 +48,13 @@ be loaded as shown below:
``vfio-pci`` kernel module rather than ``igb_uio`` or ``uio_pci_generic``. ``vfio-pci`` kernel module rather than ``igb_uio`` or ``uio_pci_generic``.
For more details see :ref:`linux_gsg_binding_kernel` below. 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 or passthrough. One can add
``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 Since DPDK release 1.7 onward provides VFIO support, use of UIO is optional
for platforms that support using VFIO. for platforms that support using VFIO.