RE: [PATCH rdma-next 13/19] RDMA/netlink: Add netlink device definitions to UAPI

["Steve Wise" <swise@opengridcomputing.com>]

> From: Leon Romanovsky <leonro@mellanox.com>
> 
> Introduce new defines to rdma_netlink.h, so the RDMA configuration tool
> will be able to communicate with RDMA subsystem by using the shared defines.
> 
> The addition of new client (NLDEV) revealed the fact that we exposed by
> mistake the RDMA_NL_I40IW define which is not backed by any RDMA netlink
> by now and it won't be exposed in the future too. So this patch reuses
> the value and leaves the comment together with old definition to whose
> who are using RDMA_NL_I40IW as a replacement for digit "5".
> 
> The NLDEV operates with objects. The struct ib_device has two straightforward
> objects: device itself and ports of that device.
> 
> This brings us to propose the following commands to work on those objects:
>  * RDMA_NLDEV_CMD_{GET,SET,NEW,DEL} - works on ib_device itself
>  * RDMA_NLDEV_CMD_PORT_{GET,SET,NEW,DEL} - works on ports of specific
> ib_device
> 
> Those commands receive/return the device name
> (RDMA_NLDEV_ATTR_DEV_NAME)
> and port index (RDMA_NLDEV_ATTR_PORT_INDEX). For device object accesses,
> the RDMA_NLDEV_ATTR_PORT_INDEX will return the maximum number of ports
> for specific ib_device and for port access the actual port index.
> 
> The port index starts from 1 to follow RDMA/core internal semantics and
> the sysfs exposed knobs..
> 
> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

Reviewed-by: Steve Wise <swise@opengridcomputing.com>