netdev - RE: [EXTERNAL] Re: [net-next PATCH v4 02/10] octeontx2-pf: RVU representor driver

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Message-ID: 
 <CH0PR18MB433924F5DCB7AF630F3EF770CDE22@CH0PR18MB4339.namprd18.prod.outlook.com>
Date: Mon, 13 May 2024 10:28:39 +0000
From: Geethasowjanya Akula <gakula@...vell.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "pabeni@...hat.com"
	<pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Sunil
 Kovvuri Goutham <sgoutham@...vell.com>,
        Subbaraya Sundeep Bhatta
	<sbhatta@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>
Subject: RE: [EXTERNAL] Re: [net-next PATCH v4 02/10] octeontx2-pf: RVU
 representor driver



> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Friday, May 10, 2024 9:05 AM
> To: Geethasowjanya Akula <gakula@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> davem@...emloft.net; pabeni@...hat.com; edumazet@...gle.com; Sunil
> Kovvuri Goutham <sgoutham@...vell.com>; Subbaraya Sundeep Bhatta
> <sbhatta@...vell.com>; Hariprasad Kelam <hkelam@...vell.com>
> Subject: [EXTERNAL] Re: [net-next PATCH v4 02/10] octeontx2-pf: RVU
> representor driver
> ----------------------------------------------------------------------
> On Tue, 7 May 2024 22:09:13 +0530 Geetha sowjanya wrote:
> > This patch adds basic driver for the RVU representor.
> > Driver on probe does pci specific initialization and does hw resources
> > configuration.
> > Introduces RVU_ESWITCH kernel config to enable/disable this driver.
> > Representor and NIC shares the code but representors netdev support
> > subset of NIC functionality. Hence "otx2_rep_dev"
> > api helps to skip the features initialization that are not supported
> > by the representors.
> 
> It's quite unusual to have a separate PCI device for representors.
> Why not extend the existing PF driver?
> This driver spawns no netdevs by default?

Sorry.. strangely this email went into spam folder, and I didn't check till now.

Our's is a multi-PF device and each of the PF has it's own VFs.
And in HW, packet parser identifies pkts sent or received by each of these PF/VFs by a unique PF_FUNC (15-11bits PF & 10-0bits PFs' VF).
If representor netdev is registered from a separate PF (ie a separate PF_FUNC) then at packet parser it's easy to install pkt forwarding rules.
eg: representee <=> representor