netdev - Re: [RFC PATCH v3 net-next 4/7] net: ethtool: let the core choose RSS context IDs

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Message-ID: <20230920090516.GA25285@xcbmartinh41x.xilinx.com>
Date: Wed, 20 Sep 2023 10:05:16 +0100
From: Martin Habets <martin.habets@....com>
To: Edward Cree <ecree.xilinx@...il.com>
CC: <edward.cree@....com>, <linux-net-drivers@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
	<netdev@...r.kernel.org>, <habetsm.xilinx@...il.com>,
	<sudheer.mogilappagari@...el.com>, <jdamato@...tly.com>, <andrew@...n.ch>,
	<mw@...ihalf.com>, <linux@...linux.org.uk>, <sgoutham@...vell.com>,
	<gakula@...vell.com>, <sbhatta@...vell.com>, <hkelam@...vell.com>,
	<saeedm@...dia.com>, <leon@...nel.org>
Subject: Re: [RFC PATCH v3 net-next 4/7] net: ethtool: let the core choose
 RSS context IDs

On Tue, Sep 19, 2023 at 03:36:30PM +0100, Edward Cree wrote:
> 
> On 19/09/2023 12:10, Martin Habets wrote:
> > On Tue, Sep 12, 2023 at 03:21:39PM +0100, edward.cree@....com wrote:
> >> +	int	(*create_rxfh_context)(struct net_device *,
> >> +				       struct ethtool_rxfh_context *ctx,
> >> +				       const u32 *indir, const u8 *key,
> >> +				       const u8 hfunc, u32 rss_context);
> > 
> > To return the rss_context this creates shouldn't it use a pointer to
> > rss_context here?
> 
> No, the whole point of this new API is that the core, not the
>  driver, chooses the value of rss_context.  Does the commit
>  message not explain that sufficiently?

Your commit describes it correct, but I had my brain wired the wrong
way around. My mistake.

Martin

> (If you look at Patch #7 you'll see that sfc doesn't even use the
>  value, though other drivers might if their HW has a fixed set of
>  slots for RSS configs.)
> 
> -ed