doc: add Rx buffer split limitation to mlx5 guide

The buffer split feature is mentioned in the mlx5 PMD
documentation, the limitation is description is added
as well.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 7f0bfed..9469331 100644 (file)
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -59,7 +59,8 @@ Features
 
 - Multi arch support: x86_64, POWER8, ARMv8, i686.
 - Multiple TX and RX queues.
-- Support for scattered TX and RX frames.
+- Support for scattered TX frames.
+- Advanced support for scattered Rx frames with tunable buffer attributes.
 - IPv4, IPv6, TCPv4, TCPv6, UDPv4 and UDPv6 RSS on any number of queues.
 - RSS using different combinations of fields: L3 only, L4 only or both,
   and source only, destination only or both.
@@ -187,6 +188,9 @@ Limitations
    the device. In case of ungraceful program termination, some entries may
    remain present and should be removed manually by other means.
 
+- Buffer split offload is supported with regular Rx burst routine only,
+  no MPRQ feature or vectorized code can be engaged.
+
 - When Multi-Packet Rx queue is configured (``mprq_en``), a Rx packet can be
   externally attached to a user-provided mbuf with having EXT_ATTACHED_MBUF in
   ol_flags. As the mempool for the external buffer is managed by PMD, all the