netdev - Re: [PATCH net v1] ice: do not reserve resources for RDMA when disabled

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Message-ID: <20241114113252.GC499069@unreal>
Date: Thu, 14 Nov 2024 13:32:52 +0200
From: Leon Romanovsky <leon@...nel.org>
To: jbrandeb@...nel.org
Cc: netdev@...r.kernel.org, jbrandeburg@...udflare.com,
	intel-wired-lan@...ts.osuosl.org,
	Dave Ertman <david.m.ertman@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net v1] ice: do not reserve resources for RDMA when
 disabled

On Wed, Nov 13, 2024 at 04:00:56PM -0800, jbrandeb@...nel.org wrote:
> From: Jesse Brandeburg <jbrandeb@...nel.org>
> 
> If the CONFIG_INFINIBAND_IRDMA symbol is not enabled as a module or a
> built-in, then don't let the driver reserve resources for RDMA.
> 
> Do this by avoiding enabling the capability when scanning hardware
> capabilities.
> 
> Fixes: d25a0fc41c1f ("ice: Initialize RDMA support")
> CC: Dave Ertman <david.m.ertman@...el.com>
> Signed-off-by: Jesse Brandeburg <jbrandeb@...nel.org>
> ---
>  drivers/net/ethernet/intel/ice/ice_common.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
> index 009716a12a26..70be07ad2c10 100644
> --- a/drivers/net/ethernet/intel/ice/ice_common.c
> +++ b/drivers/net/ethernet/intel/ice/ice_common.c
> @@ -2174,7 +2174,8 @@ ice_parse_common_caps(struct ice_hw *hw, struct ice_hw_common_caps *caps,
>  			  caps->nvm_unified_update);
>  		break;
>  	case ICE_AQC_CAPS_RDMA:
> -		caps->rdma = (number == 1);
> +		if (IS_ENABLED(CONFIG_INFINIBAND_IRDMA))

ice_eth is not dependent on CONFIG_INFINIBAND_IRDMA and can be built
perfectly without irdma. So technically, you disabled RDMA for such
kernels and users won't be able to load out-of-tree built module.

I don't care about out-of-tree code, but it is worth to add into commit
message, so users will know what to do it IRDMA stopped to work for them.

Thanks

> +			caps->rdma = (number == 1);
>  		ice_debug(hw, ICE_DBG_INIT, "%s: rdma = %d\n", prefix, caps->rdma);
>  		break;
>  	case ICE_AQC_CAPS_MAX_MTU:
> 
> base-commit: 2d5404caa8c7bb5c4e0435f94b28834ae5456623
> -- 
> 2.39.5
> 
>