linux-kernel - Re: [EXT] Re: [PATCH net-next v2 2/9] octeon

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Message-ID: <20221206092352.7a86a744@kernel.org>
Date:   Tue, 6 Dec 2022 09:23:52 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Veerasenareddy Burru <vburru@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "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>
Subject: Re: [EXT] Re: [PATCH net-next v2 2/9] octeon_ep: poll for control
 messages

On Tue, 6 Dec 2022 10:58:47 +0200 Leon Romanovsky wrote:
> > Polling for control messages every 100ms?  Sure.
> > 
> > You say "valid in netdev" so perhaps you can educate us where/why it
> > would not be?  
> 
> It doesn't seem right to me that idle device burns CPU cycles, while it
> supports interrupts. If it needs "listen to FW", it will be much nicer to
> install interrupts immediately and don't wait for netdev.

No doubt, if there is an alternative we can push for it to be
implemented. I guess this being yet another "IPU" there could
be possible workarounds in FW? As always with IPUs - hard to tell :/

If there is no alternative - it is what it is. 
It's up to customers to buy good HW.

That said, looking at what this set does - how are the VFs configured?
That's the showstopper for the series in my mind.