[RFC] mlx5: update NIC documentation on RDMA core version

[Stephen Hemminger <stephen@networkplumber.org>]

The current driver requires v16.  It will not work or build with
the older version (as in Debian stable). Note: libmlx5 is rolled
into rdma-core in current versions.

Mlx4 probably requires similar documentation update.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
 doc/guides/nics/mlx5.rst | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index f9558da89b61..603dd4e9c1cd 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -299,26 +299,26 @@ Prerequisites
 -------------
 
 This driver relies on external libraries and kernel drivers for resources
-allocations and initialization. The following dependencies are not part of
-DPDK and must be installed separately:
+allocations and initialization. The following packages come from the
+Linux RDMA core https://github.com/linux-rdma/rdma-core. The current
+version of this driver requires version version 16 or later.
 
 - **libibverbs**
 
   User space Verbs framework used by librte_pmd_mlx5. This library provides
-  a generic interface between the kernel and low-level user space drivers
-  such as libmlx5.
+  a generic interface between the kernel and low-level user space drivers.
 
   It allows slow and privileged operations (context initialization, hardware
   resources allocations) to be managed by the kernel and fast operations to
   never leave user space.
 
-- **libmlx5**
+  The development package (libibverbs-dev or libibverbs-devel) are necessary
+  for compilation.
 
-  Low-level user space driver library for Mellanox ConnectX-4/ConnectX-5
-  devices, it is automatically loaded by libibverbs.
+- **rdma-core**
 
-  This library basically implements send/receive calls to the hardware
-  queues.
+  The basic userspace infrastructure for interaction with RDMA subsystem
+  on Linux.
 
 - **Kernel modules**
 
-- 
2.15.1