netdev - Re: [PATCH net-next] net: dsa: tag_rtl4_a: Drop bit 9 from egress frames

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:   Thu, 23 Sep 2021 23:59:36 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: tag_rtl4_a: Drop bit 9 from egress frames

On Wed, Sep 15, 2021 at 9:20 AM DENG Qingfang <dqfext@...il.com> wrote:
> On Mon, Sep 13, 2021 at 04:31:56PM +0200, Linus Walleij wrote:

> > This drops the code setting bit 9 on egress frames on the
> > Realtek "type A" (RTL8366RB) frames.
>
> FYI, on RTL8366S, bit 9 on egress frames is disable learning.
>
> > This bit was set on ingress frames for unknown reason,
>
> I think it could be the reason why the frame is forwarded to the CPU.

Hm I suspect it disable learning on RTL8366RB as well.
Do we have some use for that feature in DSA taggers?

Yours,
Linus Walleij