From: Andrew Lunn <andrew@lunn•ch>
To: Egil Hjelmeland <privat@egil-hjelmeland•no>
Cc: "Roman Yeryomin" <roman@advem•lv>,
"Linus Walleij" <linus.walleij@linaro•org>,
"Vivien Didelot" <vivien.didelot@savoirfairelinux•com>,
"Florian Fainelli" <f.fainelli@gmail•com>,
netdev@vger•kernel.org, "Antti Seppälä" <a.seppala@gmail•com>,
"Colin Leitner" <colin.leitner@googlemail•com>,
"Gabor Juhos" <juhosg@openwrt•org>
Subject: Re: [PATCH 4/4] RFC: net: dsa: realtek-smi: Add Realtek SMI driver
Date: Fri, 10 Nov 2017 15:01:01 +0100 [thread overview]
Message-ID: <20171110140101.GB11872@lunn.ch> (raw)
In-Reply-To: <14bbe2b4-4c8e-d6d9-3074-d0c51dd11241@egil-hjelmeland.no>
> Out of curiosity: Are there fundamental reasons why ToR switches don't use
> the DSA model, or is it more historical?
Yes, there is a fundamental reason.
https://www.netdevconf.org/2.1/session.html?lunn_didelot_fainelli
DSA always has a host Ethernet interface connected to a port of the
switch.
A pure switchdev device does not. Often, the switch is a PCIe
device. It DMAs frames directly to/from the switch.
Basically, DSA just adds another layer, abstracting that Ethernet
interface into common code which all DSA devices share.
Andrew
next prev parent reply other threads:[~2017-11-10 14:01 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-05 23:19 [PATCH 0/4] RFC: Realtek 83xx SMI driver core Linus Walleij
2017-11-05 23:19 ` [PATCH 1/4] RFC: net/dsa: Allow DSA PHYs to define link IRQs Linus Walleij
2017-11-05 23:19 ` [PATCH 2/4] RFC: net: phy: realtek: Support RTL8366RB variant Linus Walleij
2017-11-05 23:19 ` [PATCH 3/4] RFC: net: dsa: Add bindings for Realtek SMI DSAs Linus Walleij
2017-11-05 23:48 ` Andrew Lunn
[not found] ` <20171105234831.GA24822-g2DYL2Zd6BY@public.gmane.org>
2017-11-29 12:24 ` Linus Walleij
2017-11-29 15:56 ` Andrew Lunn
2017-11-29 21:28 ` Linus Walleij
[not found] ` <CACRpkdZVXgFMiHpyUqw7ONYDcq6Htn3rTMRaBJkzd6T3WtX36A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-29 21:48 ` Florian Fainelli
2017-11-29 21:56 ` Andrew Lunn
[not found] ` <20171129215659.GC1706-g2DYL2Zd6BY@public.gmane.org>
2017-11-29 23:19 ` Linus Walleij
2017-11-29 23:26 ` Florian Fainelli
[not found] ` <f9bfa1e1-7f05-1e2b-6663-09d4d3bf6a12-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-11-29 23:36 ` Andrew Lunn
2017-12-02 12:56 ` Linus Walleij
[not found] ` <CACRpkdYoMVNh8eaTnaDQ59bsh4bC88biLaYSXyhnc4W83PMWzA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-04 22:50 ` Andrew Lunn
2017-11-05 23:19 ` [PATCH 4/4] RFC: net: dsa: realtek-smi: Add Realtek SMI driver Linus Walleij
2017-11-05 23:59 ` Andrew Lunn
2017-11-06 8:25 ` Linus Walleij
2017-11-09 12:49 ` Roman Yeryomin
2017-11-09 13:24 ` Andrew Lunn
2017-11-09 15:11 ` Roman Yeryomin
2017-11-09 15:38 ` Andrew Lunn
2017-11-09 17:21 ` Roman Yeryomin
2017-11-09 17:24 ` Andrew Lunn
2017-11-09 18:08 ` Florian Fainelli
2017-11-10 8:16 ` Linus Walleij
2017-11-10 12:05 ` Roman Yeryomin
2017-11-10 12:02 ` Roman Yeryomin
2017-11-10 13:51 ` Andrew Lunn
2017-11-10 12:17 ` Egil Hjelmeland
2017-11-10 14:01 ` Andrew Lunn [this message]
2018-04-02 16:10 ` [PATCH 0/4] RFC: Realtek 83xx SMI driver core Carl-Daniel Hailfinger
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