netdev - Re: [PATCH v4 net-next 2/7] net: ethtool: attach an XArray of custom RSS contexts to a netdevice

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Date: Thu, 5 Oct 2023 19:43:36 +0100
From: Edward Cree <ecree.xilinx@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, edward.cree@....com
Cc: linux-net-drivers@....com, davem@...emloft.net, 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: [PATCH v4 net-next 2/7] net: ethtool: attach an XArray of custom
 RSS contexts to a netdevice

On 05/10/2023 00:10, Jakub Kicinski wrote:
> On Wed, 27 Sep 2023 19:13:33 +0100 edward.cree@....com wrote:
>>  /**
>>   * struct ethtool_netdev_state - per-netdevice state for ethtool features
>> + * @rss_ctx:		XArray of custom RSS contexts
>> + * @rss_ctx_max_id:	maximum (exclusive) supported RSS context ID
> 
> Is this one set by the driver? How would it be set?

I was thinking drivers would just assign this directly in their
 probe routine.

> It'd be good if drivers didn't access ethtool state directly.
> Makes core easier to refactor if the API is constrained.

Would you prefer it as a getter in the ethtool ops?  The core
 would call it every time a new context is being allocated.

(In any case, arguably I shouldn't add it in this patch as it's
 not used until patch #4; I'll fix that in v5 either way.)