linux-kernel - Re: [PATCH RFC net-next 4/7] net: ethtool: add get_rxrings callback to optimize RX ring queries

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Message-ID: <20250908115114.GE2015@horms.kernel.org>
Date: Mon, 8 Sep 2025 12:51:14 +0100
From: Simon Horman <horms@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	kuba@...nel.org, "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev,
	jdamato@...tly.com, kernel-team@...a.com
Subject: Re: [PATCH RFC net-next 4/7] net: ethtool: add get_rxrings callback
 to optimize RX ring queries

On Fri, Sep 05, 2025 at 10:07:23AM -0700, Breno Leitao wrote:
> Add a new optional get_rxrings callback in ethtool_ops to allow drivers
> to provide the number of RX rings directly without going through the
> full get_rxnfc flow classification interface.
> 
> Modify ethtool_get_rxrings() to use get_rxrings() if available,
> falling back to get_rxnfc() otherwise.
> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
>  include/linux/ethtool.h |  1 +
>  net/ethtool/ioctl.c     | 25 +++++++++++++++++++++----
>  2 files changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index de5bd76a400ca..4f6da35a77eb1 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -1141,6 +1141,7 @@ struct ethtool_ops {
>  				 struct ethtool_ringparam *,
>  				 struct kernel_ethtool_ringparam *,
>  				 struct netlink_ext_ack *);
> +	int	(*get_rxrings)(struct net_device *dev);

Hi Breno,

Please also add get_rxrings to the Kernel doc for struct ethtool_ops.

>  	void	(*get_pause_stats)(struct net_device *dev,
>  				   struct ethtool_pause_stats *pause_stats);
>  	void	(*get_pauseparam)(struct net_device *,