linux-kernel - Re: [PATCH net] idpf: don't skip over ethtool tcp-data-split setting

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Date: Wed, 15 May 2024 11:31:18 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Michal Schmidt <mschmidt@...hat.com>
CC: Jesse Brandeburg <jesse.brandeburg@...el.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, "David S. Miller" <davem@...emloft.net>, "Eric
 Dumazet" <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>, "Michal
 Kubiak" <michal.kubiak@...el.com>, Xu Du <xudu@...hat.com>,
	<intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] idpf: don't skip over ethtool tcp-data-split setting

From: Michal Schmidt <mschmidt@...hat.com>
Date: Wed, 15 May 2024 11:24:14 +0200

> Disabling tcp-data-split on idpf silently fails:
>   # ethtool -G $NETDEV tcp-data-split off
>   # ethtool -g $NETDEV | grep 'TCP data split'
>   TCP data split:        on
> 
> But it works if you also change 'tx' or 'rx':
>   # ethtool -G $NETDEV tcp-data-split off tx 256
>   # ethtool -g $NETDEV | grep 'TCP data split'
>   TCP data split:        off

Oh crap >_< I'm sorry, thanks for the fix!

> 
> The bug is in idpf_set_ringparam, where it takes a shortcut out if the
> TX and RX sizes are not changing. Fix it by checking also if the
> tcp-data-split setting remains unchanged. Only then can the soft reset
> be skipped.
> 
> Fixes: 9b1aa3ef2328 ("idpf: add get/set for Ethtool's header split ringparam")
> Reported-by: Xu Du <xudu@...hat.com>
> Closes: https://issues.redhat.com/browse/RHEL-36182
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>

Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>

> ---
>  drivers/net/ethernet/intel/idpf/idpf_ethtool.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_ethtool.c b/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
> index 986d429d1175..6972d728431c 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_ethtool.c
> @@ -376,7 +376,8 @@ static int idpf_set_ringparam(struct net_device *netdev,
>  			    new_tx_count);
>  
>  	if (new_tx_count == vport->txq_desc_count &&
> -	    new_rx_count == vport->rxq_desc_count)
> +	    new_rx_count == vport->rxq_desc_count &&
> +	    kring->tcp_data_split == idpf_vport_get_hsplit(vport))
>  		goto unlock_mutex;
>  
>  	if (!idpf_vport_set_hsplit(vport, kring->tcp_data_split)) {

Olek