netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andrew Lunn <andrew@lunn.ch>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	netdev <netdev@vger.kernel.org>, DENG Qingfang <dqfext@gmail.com>
Subject: Re: [net-next PATCH 1/5] net: dsa: tag_rtl4_a: Implement Realtek 4 byte A tag
Date: Thu, 4 Jun 2020 02:54:07 +0200	[thread overview]
Message-ID: <20200604005407.GA977471@lunn.ch> (raw)
In-Reply-To: <CACRpkdbu4O_6SvgTU3A5mYVrAn-VWpr9=0LD+M+LduuqVnjsnA@mail.gmail.com>

> > Where is spanning tree performed? In the switch, or by the
> > host?
> 
> In the switch I think.
> There is a register in the ASIC to set the spanning tree status
> to disabled, blocking, learning or forwarding.

Hi Linus

Spanning tree needs two parts. You need to be able to change the ports
between disabled, blocking, learning, forwarding. And you need to be
able to send/receive frames.

If spanning tree is performed in the ASIC, i don't see why there would
be registers to control the port status. It would do it all itself,
and not export these controls.

So i would not give up on spanning tree as a way to reverse engineer
this.

    Andrew

  reply	other threads:[~2020-06-04  0:54 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-02 20:54 [net-next PATCH 1/5] net: dsa: tag_rtl4_a: Implement Realtek 4 byte A tag Linus Walleij
2020-06-02 20:54 ` [net-next PATCH 2/5] net: dsa: rtl8366rb: Support the CPU DSA tag Linus Walleij
2020-06-02 20:54 ` [net-next PATCH 3/5] net: dsa: rtl8366: Split out default VLAN config Linus Walleij
2020-06-02 20:54 ` [net-next PATCH 4/5] net: dsa: rtl8366: VLAN 0 as disable tagging Linus Walleij
2020-06-02 20:54 ` [net-next PATCH 5/5] net: dsa: rtl8366: Use top VLANs for default Linus Walleij
2020-06-03  2:19   ` DENG Qingfang
2020-06-03  8:33     ` Linus Walleij
2020-06-02 22:48 ` [net-next PATCH 1/5] net: dsa: tag_rtl4_a: Implement Realtek 4 byte A tag David Miller
2020-06-03  8:32   ` Linus Walleij
2020-06-03 13:52 ` Andrew Lunn
2020-06-03 22:01   ` Linus Walleij
2020-06-04  0:54     ` Andrew Lunn [this message]
2020-06-04  7:52       ` Linus Walleij
2020-06-04 11:22         ` Vladimir Oltean
2020-06-17  8:06           ` Linus Walleij
2020-06-18  3:17             ` DENG Qingfang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200604005407.GA977471@lunn.ch \
    --to=andrew@lunn.ch \
    --cc=dqfext@gmail.com \
    --cc=f.fainelli@gmail.com \
    --cc=linus.walleij@linaro.org \
    --cc=netdev@vger.kernel.org \
    --cc=vivien.didelot@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).