doc: add KNI limitation in release notes

Commit a9460a0b2efb ("kni: fix build on Linux 4.19") disables some
ethtool commands because they are removed in newer (4.19) kernels.

This patch documents removed functionality.

Fixes: a9460a0b2efb ("kni: fix build on Linux 4.19")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 56011b4..32ff0e5 100644 (file)
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -412,6 +412,12 @@ API Changes
   When KNI sample application is used, ``-m`` parameter can be used to
   automatically update the carrier status for the interface.
 
+* kni: When ethtool support enabled (``CONFIG_RTE_KNI_KMOD_ETHTOOL=y``)
+  ethtool commands ``ETHTOOL_GSET & ETHTOOL_SSET`` are no more supported for the
+  kernels that has ``ETHTOOL_GLINKSETTINGS & ETHTOOL_SLINKSETTINGS`` support.
+  This means ``ethtool "-a|--show-pause", "-s|--change"`` won't work, and
+  ``ethtool <iface>`` output will have less information.
+
 
 ABI Changes
 -----------