netdev - RE: [EXT] Re: [PATCH net-next 1/9] octeon

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Message-ID: <BYAPR18MB24237D62CF4947B889D84BDCCC059@BYAPR18MB2423.namprd18.prod.outlook.com>
Date:   Mon, 14 Nov 2022 20:47:42 +0000
From:   Veerasenareddy Burru <vburru@...vell.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Liron Himi <lironh@...vell.com>,
        Abhijit Ayarekar <aayarekar@...vell.com>,
        Sathesh B Edara <sedara@...vell.com>,
        Satananda Burla <sburla@...vell.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: RE: [EXT] Re: [PATCH net-next 1/9] octeon_ep: wait for firmware ready



> -----Original Message-----
> From: Leon Romanovsky <leon@...nel.org>
> Sent: Monday, November 7, 2022 12:19 AM
> To: Veerasenareddy Burru <vburru@...vell.com>
> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Liron Himi
> <lironh@...vell.com>; Abhijit Ayarekar <aayarekar@...vell.com>; Sathesh
> B Edara <sedara@...vell.com>; Satananda Burla <sburla@...vell.com>;
> linux-doc@...r.kernel.org; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>;
> Paolo Abeni <pabeni@...hat.com>
> Subject: [EXT] Re: [PATCH net-next 1/9] octeon_ep: wait for firmware ready
> 
> External Email
> 
> ----------------------------------------------------------------------
> On Sun, Nov 06, 2022 at 11:25:15PM -0800, Veerasenareddy Burru wrote:
> > Make driver initialize the device only after firmware is ready
> >  - add async device setup routine.
> >  - poll firmware status register.
> >  - once firmware is ready, call async device setup routine.
> 
> Please don't do it. It is extremely hard to do it right. The proposed code that
> has combination of atomics used as a locks together with absence of proper
> locking from PCI and driver cores supports my claim.
> 
> Thanks
Leon
          What is the alternate approach you suggest here ?  Are you suggesting usage of deferred probe ? the driver initialization cannot proceed till firmware ready is set by firmware.
Thanks