doc: add mlx5 IPv6 multicast limitation in VM

This patch adds limitation notice for MLX5 PMD.
IPv6 multicast messages are not received on VM when promiscuous
and allmulticast modes are off, due to netlink restriction.

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 6ab7d8e..3610e00 100644 (file)
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -137,6 +137,11 @@ Limitations
   enabled (``rxq_cqe_comp_en``) at the same time, RSS hash result is not fully
   supported. Some Rx packets may not have PKT_RX_RSS_HASH.
 
+- IPv6 Multicast messages are not supported on VM, while promiscuous mode
+  and allmulticast mode are both set to off.
+  To receive IPv6 Multicast messages on VM, explicitly set the relevant
+  MAC address using rte_eth_dev_mac_addr_add() API.
+
 Statistics
 ----------