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.
+
+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.