DPDK patches and discussions
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From: Bruce Richardson <bruce.richardson@intel.com>
To: "tone.zhang" <tone.zhang@arm.com>
Cc: dev@dpdk.org, gavin.hu@arm.com, bluca@debian.org,
	roszenrami@gmail.com, Honnappa.Nagarahalli@arm.com, nd@arm.com
Subject: Re: [dpdk-dev] [PATCH v4] doc: Clarify IOMMU usage with "uio_pci_generic" kernel module
Date: Fri, 21 Sep 2018 12:20:23 +0100	[thread overview]
Message-ID: <20180921112023.GA2668@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <1537499262-22644-1-git-send-email-tone.zhang@arm.com>

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 <tone.zhang@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..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 <bruce.richardson@intel.com>

  reply	other threads:[~2018-09-21 11:20 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-04  8:59 [dpdk-dev] [PATCH] doc: Clarify IOMMU usage with "uio-pci" " tone.zhang
2018-09-04  9:16 ` Gavin Hu (Arm Technology China)
2018-09-04 10:06 ` Bruce Richardson
2018-09-04 10:15   ` Luca Boccassi
2018-09-04 10:25     ` Tone Zhang (Arm Technology China)
2018-09-04 19:55 ` Rami Rosen
2018-09-05  0:20   ` Tone Zhang (Arm Technology China)
2018-09-05  9:22     ` Stephen Hemminger
2018-09-05  9:49       ` Tone Zhang (Arm Technology China)
2018-09-05  4:39 ` [dpdk-dev] [PATCH v2] doc: Clarify IOMMU usage with "uio_pci_generic" " tone.zhang
2018-09-05  5:17   ` [dpdk-dev] [PATCH v3] " tone.zhang
2018-09-05  5:23     ` Gavin Hu (Arm Technology China)
2018-09-19  7:44     ` Tone Zhang (Arm Technology China)
2018-09-19 11:33       ` Bruce Richardson
2018-09-19 11:54         ` Luca Boccassi
2018-09-21  2:39           ` Tone Zhang (Arm Technology China)
2018-09-19 10:42     ` Luca Boccassi
2018-09-21  3:07     ` [dpdk-dev] [PATCH v4] " tone.zhang
2018-09-21 11:20       ` Bruce Richardson [this message]
2018-09-25  6:18         ` Tone Zhang (Arm Technology China)
2018-09-25  6:54       ` [dpdk-dev] [PATCH v5] " tone.zhang
2018-09-26  5:08         ` [dpdk-dev] [PATCH v6] " tone.zhang
2018-11-19  0:04           ` Thomas Monjalon

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