netdev - Re: [RFC net-next 1/2] ethtool: add support for controling the type of adaptive coalescing

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Message-ID: <20201120133938.GG1804098@lunn.ch>
Date:   Fri, 20 Nov 2020 14:39:38 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     tanhuazhong <tanhuazhong@...wei.com>, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, kuba@...nel.org
Subject: Re: [RFC net-next 1/2] ethtool: add support for controling the type
 of adaptive coalescing

On Fri, Nov 20, 2020 at 08:23:22AM +0100, Michal Kubecek wrote:
> On Fri, Nov 20, 2020 at 10:59:59AM +0800, tanhuazhong wrote:
> > On 2020/11/20 6:02, Michal Kubecek wrote:
> > > 
> > > We could use a similar approach as struct ethtool_link_ksettings, e.g.
> > > 
> > > 	struct kernel_ethtool_coalesce {
> > > 		struct ethtool_coalesce base;
> > > 		/* new members which are not part of UAPI */
> > > 	}
> > > 
> > > get_coalesce() and set_coalesce() would get pointer to struct
> > > kernel_ethtool_coalesce and ioctl code would be modified to only touch
> > > the base (legacy?) part.
> > >  > While already changing the ops arguments, we could also add extack
> > > pointer, either as a separate argument or as struct member (I slightly
> > > prefer the former).
> > 
> > If changing the ops arguments, each driver who implement
> > set_coalesce/get_coalesce of ethtool_ops need to be updated. Is it
> > acceptable adding two new ops to get/set ext_coalesce info (like
> > ecc31c60240b ("ethtool: Add link extended state") does)? Maybe i can send V2
> > in this way, and then could you help to see which one is more suitable?
> 
> If it were just this one case, adding an extra op would be perfectly
> fine. But from long term point of view, we should expect extending also
> other existing ethtool requests and going this way for all of them would
> essentially double the number of callbacks in struct ethtool_ops.

coccinella might be useful here.

	   Andrew