doc: add feature support matrix link in i40e guide

There is an increase in number of issues related to supported cables and
modules, this link and note can help users identify or narrow down the
issues.

Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index cc8724a..d6e578e 100644 (file)
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -59,6 +59,21 @@ Prerequisites
 - Upgrade the NVM/FW version following the `Intel® Ethernet NVM Update Tool Quick Usage Guide for Linux
   <https://www-ssl.intel.com/content/www/us/en/embedded/products/networking/nvm-update-tool-quick-linux-usage-guide.html>`_ and `Intel® Ethernet NVM Update Tool: Quick Usage Guide for EFI <https://www.intel.com/content/www/us/en/embedded/products/networking/nvm-update-tool-quick-efi-usage-guide.html>`_ if needed.
 
+- For information about supported media, please refer to this document: `Intel® Ethernet Controller X710/XXV710/XL710 Feature Support Matrix
+  <http://www.intel.com/content/dam/www/public/us/en/documents/release-notes/xl710-ethernet-controller-feature-matrix.pdf>`_.
+
+   .. Note::
+
+      * Some adapters based on the Intel(R) Ethernet Controller 700 Series only
+        support Intel Ethernet Optics modules. On these adapters, other modules are not
+        supported and will not function.
+
+      * For connections based on Intel(R) Ethernet Controller 700 Series,
+        support is dependent on your system board. Please see your vendor for details.
+
+      * In all cases Intel recommends using Intel Ethernet Optics; other modules
+        may function but are not validated by Intel. Contact Intel for supported media types.
+
 Recommended Matching List
 -------------------------