netdev - Re: [PATCH 2/2] net: ethernet: Add driver for Sunplus SP7021

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 8 Nov 2021 15:52:35 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Wells Lu 呂芳騰 <wells.lu@...plus.com>
Cc:     Wells Lu <wellslutw@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>
Subject: Re: [PATCH 2/2] net: ethernet: Add driver for Sunplus SP7021

> The switch will not recognize type of packets, regardless BPDU, PTP or any other
> packets. If turning off source-address learning function, it works like an Ethernet
> plus a 2-port hub.

So without STP, there is no way to stop an loop, and a broadcast storm
taking down your network?

Looking at the TX descriptor, there are two bits:

          [18]: force forward to port 0
          [19]: force forward to port 1

When the switch is enabled, can these two bits be used?

In the RX descriptor there is:

pkt_sp:
          000: from port0
          001: from port1
          110: soc0 loopback
          101: soc1 loopback

Are these bits used when the switch is enabled?

0.31 port control 1 (port cntl1) blocking state seems to have what you
need for STP.

    Andrew