netdev - RE: [PATCH ethtool] netlink: rss: retrieve ring count using ETHTOOL

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Message-ID: <IA1PR11MB62661EF398124FC523CC3C03E4652@IA1PR11MB6266.namprd11.prod.outlook.com>
Date: Fri, 13 Sep 2024 23:07:54 +0000
From: "Mogilappagari, Sudheer" <sudheer.mogilappagari@...el.com>
To: Vladimir Oltean <vladimir.oltean@....com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Michal Kubecek
	<mkubecek@...e.cz>, Jakub Kicinski <kuba@...nel.org>
Subject: RE: [PATCH ethtool] netlink: rss: retrieve ring count using
 ETHTOOL_GRXRINGS ioctl



> -----Original Message-----
> From: Vladimir Oltean <vladimir.oltean@....com>
> Sent: Friday, September 13, 2024 3:49 PM
> To: Mogilappagari, Sudheer <sudheer.mogilappagari@...el.com>
> Cc: netdev@...r.kernel.org; Michal Kubecek <mkubecek@...e.cz>; Jakub
> Kicinski <kuba@...nel.org>
> Subject: Re: [PATCH ethtool] netlink: rss: retrieve ring count using
> ETHTOOL_GRXRINGS ioctl
> 
> Hi Sudheer,
> 
> On Fri, Sep 13, 2024 at 10:43:19PM +0000, Mogilappagari, Sudheer wrote:
> > Hi Vladimir, my understanding is ioctls are not used in ethtool
> > netlink path. Can we use ETHTOOL_MSG_RINGS_GET
> (tb[ETHTOOL_A_RINGS_RX]
> > member) instead ?
> 
> You mean this?
> 
>   ``ETHTOOL_A_RINGS_RX``                u32     size of RX ring

Yes. I had meant ETHTOOL_A_RINGS_RX but I see it is ring size and not ring
count. There seems to be no netlink message that fetches ringcount info.