linux-kernel - Re: [PATCH net-next v3 3/3] net: stmmac: Add PCI driver support for BCM8958x

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Message-ID: <CAMdnO-KpcksaTiqazjVLXNTjJAT+bS8vTVmux94CKLooej=s7A@mail.gmail.com>
Date: Fri, 9 Aug 2024 15:10:05 -0700
From: Jitendra Vegiraju <jitendra.vegiraju@...adcom.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, alexandre.torgue@...s.st.com, joabreu@...opsys.com, 
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, 
	mcoquelin.stm32@...il.com, bcm-kernel-feedback-list@...adcom.com, 
	richardcochran@...il.com, ast@...nel.org, daniel@...earbox.net, 
	hawk@...nel.org, john.fastabend@...il.com, linux-kernel@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org, 
	linux@...linux.org.uk, horms@...nel.org, florian.fainelli@...adcom.com
Subject: Re: [PATCH net-next v3 3/3] net: stmmac: Add PCI driver support for BCM8958x

On Fri, Aug 9, 2024 at 1:12 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Thu, Aug 08, 2024 at 06:54:51PM -0700, Jitendra Vegiraju wrote:
> > On Tue, Aug 6, 2024 at 4:15 PM Andrew Lunn <andrew@...n.ch> wrote:
> > >
> > > On Mon, Aug 05, 2024 at 05:56:43PM -0700, Jitendra Vegiraju wrote:
> > > > On Fri, Aug 2, 2024 at 4:08 PM Andrew Lunn <andrew@...n.ch> wrote:
> > > > >
> > > > > > Management of integrated ethernet switch on this SoC is not handled by
> > > > > > the PCIe interface.
> > > > >
> > > > > MDIO? SPI? I2C?
> > > > >
> > > > The device uses SPI interface. The switch has internal ARM M7 for
> > > > controller firmware.
> > >
> > > Will there be a DSA driver sometime soon talking over SPI to the
> > > firmware?
> > >
> > Hi Andrew,
>
> So the switch will be left in dumb switch everything to every port
> mode? Or it will be totally autonomous using the in build firmware?
>
> What you cannot expect is we allow you to manage the switch from Linux
> using something other than an in kernel driver, probably DSA or pure
> switchdev.

I am starting to get familiar with DSA and switchdev.
The configuration can be sent over the SPI interface.
In the current application, the host receiving PCIE network traffic
need not be the same host that controls the SPI interface.

>
>         Andrew