doc: add known issue for i40e statistics

Rx statistic is incorrect when packet is oversize.

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index 1245ecf..b890613 100644 (file)
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -460,3 +460,10 @@ Receive packets with Ethertype 0x88A8
 
 Due to the FW limitation, PF can receive packets with Ethertype 0x88A8
 only when floating VEB is disabled.
 
 Due to the FW limitation, PF can receive packets with Ethertype 0x88A8
 only when floating VEB is disabled.

+
+Incorrect Rx statistics when packet is oversize
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When a packet is over maximum frame size, the packet is dropped.
+However the Rx statistics, when calling `rte_eth_stats_get` incorrectly
+shows it as received.