doc: add mirror rule limitation of X722

Currently, X722 firmware doesn't support to add more than
one mirror rule in one VSI.

Signed-off-by: Lingyu Liu <lingyu.liu@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index 20c9983..c9de2e1 100644 (file)
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -723,6 +723,11 @@ When programming cloud filters for IPv4/6_UDP/TCP/SCTP with SRC port only or DST
 it will make any cloud filter using inner_vlan or tunnel key invalid. Default configuration will be
 recovered only by NIC core reset.
 
+Mirror rule limitation for X722
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Due to firmware restriction of X722, the same VSI cannot have more than one mirror rule.
+
 High Performance of Small Packets on 40GbE NIC
 ----------------------------------------------