[PATCH] doc: remove custom kernel patch link in ENA's guide

[Michal Krawczyk <mk@semihalf.com>]

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>
---
 doc/guides/nics/ena.rst | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/doc/guides/nics/ena.rst b/doc/guides/nics/ena.rst
index 92b1858e7a..04fb5d4d75 100644
--- a/doc/guides/nics/ena.rst
+++ b/doc/guides/nics/ena.rst
@@ -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``
-- 
2.25.1