netdev - Re: [PATCH iwl-net v2 2/3] idpf: Fix RSS LUT configuration on down interfaces

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Message-ID: <aSg5pg9aLwmiVR6G@horms.kernel.org>
Date: Thu, 27 Nov 2025 11:44:38 +0000
From: Simon Horman <horms@...nel.org>
To: Sreedevi Joshi <sreedevi.joshi@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Emil Tantilov <emil.s.tantilov@...el.com>
Subject: Re: [PATCH iwl-net v2 2/3] idpf: Fix RSS LUT configuration on down
 interfaces

On Mon, Nov 24, 2025 at 12:47:49PM -0600, Sreedevi Joshi wrote:
> RSS LUT provisioning and queries on a down interface currently return
> silently without effect. Users should be able to configure RSS settings
> even when the interface is down.
> 
> Fix by maintaining RSS configuration changes in the driver's soft copy and
> deferring HW programming until the interface comes up.
> 
> Fixes: 02cbfba1add5 ("idpf: add ethtool callbacks")
> Signed-off-by: Sreedevi Joshi <sreedevi.joshi@...el.com>
> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> Reviewed-by: Emil Tantilov <emil.s.tantilov@...el.com>
> ---
>  drivers/net/ethernet/intel/idpf/idpf_ethtool.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_ethtool.c b/drivers/net/ethernet/intel/idpf/idpf_ethtool.c

...

> @@ -424,7 +429,7 @@ static int idpf_get_rxfh(struct net_device *netdev,
>  
>  	if (rxfh->indir) {
>  		for (i = 0; i < rss_data->rss_lut_size; i++)
> -			rxfh->indir[i] = rss_data->rss_lut[i];
> +			rxfh->indir[i] = rxhash_ena ? rss_data->rss_lut[i] : 0;

Hi,

I feel that I am missing something here.
But I would have expected rxfh->indir to be populated by rss_data->rss_lut
regardless of the port is up or down. IOW, I'm unclear on why
0 is reported for the indirection table if the interface is down.

>  	}
>  
>  unlock_mutex:

...