netdev - Re: ethtool: ring configuration for CAN devices

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Message-ID: <YXaqEk97/WcCxcFE@lunn.ch>
Date:   Mon, 25 Oct 2021 14:58:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     linux-can <linux-can@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: ethtool: ring configuration for CAN devices

> > struct ethtool_kringparam {
> > 	__u32	cmd;
> > 	__u32   mode;
> > 	__u32	rx_max_pending;
> > 	__u32	rx_mini_max_pending;
> > 	__u32	rx_jumbo_max_pending;
> > 	__u32	tx_max_pending;
> > 	__u32	rx_pending;
> > 	__u32	rx_mini_pending;
> > 	__u32	rx_jumbo_pending;
> > 	__u32	tx_pending;
> > };
> > 
> > and use this structure between the ethtool core and the drivers. This
> > has already been done at least once to allow extending the
> > API. Semantic patches are good for making the needed changes to all
> > the drivers.
> 
> What about the proposed "two new parameters ringparam_ext and extack for
> .get_ringparam and .set_ringparam to extend more ring params through
> netlink." by Hao Chen/Guangbin Huang in:
> 
> https://lore.kernel.org/all/20211014113943.16231-5-huangguangbin2@huawei.com/
>
> I personally like the conversion of the in in-kernel API to struct
> ethtool_kringparam better than adding ringparam_ext.

Ah, i missed that development. I don't like it.

You should probably jump into that discussion and explain your
requirements. Make sure it is heading in a direction you can extend
for your needs.

    Andrew