ice: document RDMA devlink parameters

Commit e523af4e ("net/ice: Add support for enable_iwarp and enable_roce
devlink param") added support for the enable_roce and enable_iwarp
parameters in the ice driver. It didn't document these parameters in the
ice devlink documentation file. Add this documentation, including a note
about the mutual exclusion between the two modes.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Reviewed-by: NLeon Romanovsky <leonro@nvidia.com>
Acked-by: NTony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20230414162614.571861-1-jacob.e.keller@intel.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

Documentation/networking/devlink/ice.rst

@@ -7,6 +7,21 @@ ice devlink support
 This document describes the devlink features implemented by the ``ice``
 device driver.
 
+Parameters
+==========
+
+.. list-table:: Generic parameters implemented
+
+   * - Name
+     - Mode
+     - Notes
+   * - ``enable_roce``
+     - runtime
+     - mutually exclusive with ``enable_iwarp``
+   * - ``enable_iwarp``
+     - runtime
+     - mutually exclusive with ``enable_roce``
+
 Info versions
 =============