doc: add known issue with RSS in ixgbe guide

Currently, IXGBE doesn't support RSS when double VLAN
is enabled due to FW limitation.

Signed-off-by: Beilei Xing <beilei.xing@intel.com>
Acked-by: Haiyue Wang <haiyue.wang@intel.com>

diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst
index c801dba..696cbd9 100644 (file)
--- a/doc/guides/nics/ixgbe.rst
+++ b/doc/guides/nics/ixgbe.rst
@@ -252,6 +252,11 @@ Before binding ``vfio`` with legacy mode in X550 NICs, use ``modprobe vfio ``
 ``nointxmask=1`` to load ``vfio`` module if the intx is not shared with other
 devices.
 
+RSS isn't supported when QinQ is enabled
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Due to FW limitation, IXGBE doesn't support RSS when QinQ is enabled currently.
+
 Inline crypto processing support
 --------------------------------