[PATCH v1] doc: add known issue in i40e guide

[Steve Yang]

Add a known issue: configuring VLAN filters from VF is unsupported
for driver 2.17.15.

Signed-off-by: Steve Yang <stevex.yang at intel.com>
---
 doc/guides/nics/i40e.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index 4875774346..abb99406b3 100644
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -731,6 +731,13 @@ Vlan strip of VF
 
 The VF vlan strip function is only supported in the i40e kernel driver >= 2.1.26.
 
+Vlan filtering of VF
+~~~~~~~~~~~~~~~~~~~~
+
+For i40e driver 2.17.15, configuring VLAN filters from the DPDK VF is unsupported.
+Workaround: When applying VLAN filters on the VF it must first be configured from
+the corresponding PF.
+
 DCB function
 ~~~~~~~~~~~~
 
-- 
2.25.1