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doc: remove custom kernel patch link in ena guide

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ENAv2 device requires write combining support which isn't supported by
the upstream vfio-pci. amzn-driver repository provided non-upstream
patch to enable this feature and it was linked directly by the ENA PMD
guide.

To avoid custom kernel patch linking, the user is now guided to the AWS
ENA PMD documentation, which describes vfio-pci and ENAv2 issue more
deeply with possible workarounds on how to resolve it.

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Michal Krawczyk 2021-11-23 08:23:21 +01:00 committed by Ferruh Yigit
parent 0ece5de3c4
commit 036ecae0ef
1 changed files with 2 additions and 3 deletions
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5
doc/guides/nics/ena.rst
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@ -158,9 +158,8 @@ Prerequisites
In DPDK ``igb_uio`` it must be enabled by loading module with
``wc_activate=1`` flag (example below). However, mainline's vfio-pci
driver in kernel doesn't have WC support yet (planed to be added).
If vfio-pci used user should be either turn off ENAv2 (to avoid performance
impact) or recompile vfio-pci driver with patch provided in
`amzn-github <https://github.com/amzn/amzn-drivers/tree/master/userspace/dpdk/enav2-vfio-patch>`_.
If vfio-pci is used user should follow `AWS ENA PMD documentation
<https://github.com/amzn/amzn-drivers/tree/master/userspace/dpdk/README.md>`_.
#. Insert ``vfio-pci`` or ``igb_uio`` kernel module using the command
``modprobe vfio-pci`` or ``modprobe uio; insmod igb_uio.ko wc_activate=1``