Re: [Intel-wired-lan] [PATCH iwl-net 3/4] ice: support RDMA on 4+-port E830 devices

[Simon Horman <horms@kernel.org>]

From: 'Simon Horman' <horms@kernel.org>

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---
ice: support RDMA on 4+-port E830 devices

This patch narrows the RDMA capability check to keep RDMA enabled for E830
devices configured with more than 4 ports, as they do not share the
limitations of E810 and E82X devices.

> diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
> --- a/drivers/net/ethernet/intel/ice/ice_common.c
> +++ b/drivers/net/ethernet/intel/ice/ice_common.c
> @@ -2509,7 +2509,7 @@ ice_recalc_port_limited_caps(struct ice_hw *hw, struct ice_hw_common_caps *caps)
>  		caps->maxtc = 4;
>  		ice_debug(hw, ICE_DBG_INIT, "reducing maxtc to %d (based on #ports)\n",
>  			  caps->maxtc);
> -		if (caps->rdma) {
> +		if (caps->rdma && hw->mac_type != ICE_MAC_E830) {
>  			ice_debug(hw, ICE_DBG_INIT, "forcing RDMA off\n");
>  			caps->rdma = 0;
>  		}

Does this leave the diagnostic message further down out of sync with the
new condition?

If the device is an E830 with more than 4 ports, RDMA remains enabled, but
because the dev_info() call just below this block is evaluated for all
devices with more than 4 ports:

ice_recalc_port_limited_caps() {
	if (hw->dev_caps.num_funcs > 4) {
		...
		if (caps->rdma && hw->mac_type != ICE_MAC_E830) {
			ice_debug(hw, ICE_DBG_INIT, "forcing RDMA off\n");
			caps->rdma = 0;
		}

		/* print message only when processing device capabilities
		 * during initialization.
		 */
		if (caps == &hw->dev_caps.common_cap)
			dev_info(ice_hw_to_dev(hw), "RDMA functionality is not available with the current device configuration.\n");
	}
}

Could this cause confusion by logging a warning about RDMA being disabled
when it is actually active?