From: Andrew Lunn <andrew@lunn.ch>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Rob Herring <robh@kernel.org>, John Crispin <john@phrozen.org>,
Vivien Didelot <vivien.didelot@savoirfairelinux.com>,
"David S . Miller" <davem@davemloft.net>,
Sean Wang <sean.wang@mediatek.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH V2 1/3] Documentation: devicetree: add multiple cpu port DSA binding
Date: Thu, 8 Jun 2017 21:31:12 +0200 [thread overview]
Message-ID: <20170608193112.GF20216@lunn.ch> (raw)
In-Reply-To: <64218746-fbb6-f958-ba15-5ed704214d25@gmail.com>
> Right now we don't have any mechanism, and statically doing this from
> Device Tree is too inflexible. I have been working on a parallel path
> where we use the bridge (which is already accelerated when there is a
> switch) in order to define groups of ports, the idea would be do to e.g:
>
> brctl addbr br-lan
> brctl addbr br-lan eth0
> brctl addbr br-lan lan1
> ...
> brctl addbr br-lan lan4
>
> brctl addbr br-wan
> brctl addbr br-wan eth1
> brctl addbr br-wan wan
>
> Assuming that lan1-lan4 are your LAN ports, and wan is your WAN port and
> you have two CPU ports.
Hi Florian
I don't like this, on multiple levels.
My wan port typically never has more than 40Mbps of traffic on it. So
dedicating a whole 1Gbps ethernet to it makes no sense. I want to
share eth1 bandwidth with the wan port, and some of the other
ports. Meaning i would have to add eth1 to br-lan as well as
br-wan. Does the bridge allow that? And what sort of hacks do you have
to allow a port to be added to a bridge, but not used by the bridge?
And what is the point of br-wan? It only has one real port in it. So
i'm adding per-packet overhead which i don't need, just in order to
signal to the hardware how it should statically route cpu traffic for
a port.
Now say i have one of the bigger marvell switches, with 11 ports, in
an industrial application. I setup 3 or 4 bridges. I then need to add
eth0 and eth1 to two different bridges. And say i use some ports
without a bridge. How do i configure them?
And how do i dump the current mapping?
For me, this is the wrong architecture. What CPU port is used should
be a port property, not a bridge property. I think we should use
devlink. Add commands to dump the current mapping, and set it.
Andrew
next prev parent reply other threads:[~2017-06-08 19:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-30 10:44 [PATCH V2 1/3] Documentation: devicetree: add multiple cpu port DSA binding John Crispin
2017-05-30 10:44 ` [PATCH V2 2/3] net-next: dsa: add multi cpu port support John Crispin
2017-05-30 15:38 ` kbuild test robot
2017-05-30 18:37 ` John Crispin
2017-05-30 19:15 ` Florian Fainelli
2017-05-30 19:23 ` Florian Fainelli
2017-05-30 19:45 ` Vivien Didelot
2017-05-30 19:50 ` Vivien Didelot
2017-05-30 22:56 ` Florian Fainelli
2017-05-31 0:06 ` Andrew Lunn
2017-05-31 0:16 ` Florian Fainelli
2017-05-31 0:52 ` Andrew Lunn
2017-05-30 10:44 ` [PATCH V2 3/3] net-next: dsa: mt7530: " John Crispin
2017-05-30 21:32 ` [PATCH V2 1/3] Documentation: devicetree: add multiple cpu port DSA binding Florian Fainelli
2017-06-07 21:10 ` Rob Herring
2017-06-07 21:35 ` Florian Fainelli
2017-06-08 19:31 ` Andrew Lunn [this message]
2017-06-08 19:57 ` Florian Fainelli
2017-06-07 21:42 ` Andrew Lunn
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