[dpdk-dev] [PATCH] doc: document KNI limitation in release notes

[Ferruh Yigit]

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.

Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
 doc/guides/rel_notes/release_18_11.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 27b67e0fd..6ce276b22 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -377,6 +377,12 @@ API Changes
 * eventdev: Type of 2nd parameter to ``rte_event_eth_rx_adapter_caps_get()``
   has been changed from uint8_t to uint16_t.
 
+* 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
 -----------
-- 
2.17.2