linux-kernel - Re: [PATCH net 2/2] net: dsa: sja1105: always enable the send

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]

Message-ID: <f601d1c6-f131-b77e-0cb3-65b4afad8cff@gmail.com>
Date:   Sun, 2 Jul 2023 16:39:21 +0200
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: dsa: sja1105: always enable the send_meta
 options



On 6/29/2023 4:14 PM, Vladimir Oltean wrote:
> incl_srcpt has the limitation, mentioned in commit b4638af8885a ("net:
> dsa: sja1105: always enable the INCL_SRCPT option"), that frames with a
> MAC DA of 01:80:c2:xx:yy:zz will be received as 01:80:c2:00:00:zz unless
> PTP RX timestamping is enabled.
> 
> The incl_srcpt option was initially unconditionally enabled, then that
> changed with commit 42824463d38d ("net: dsa: sja1105: Limit use of
> incl_srcpt to bridge+vlan mode"), then again with b4638af8885a ("net:
> dsa: sja1105: always enable the INCL_SRCPT option"). Bottom line is that
> it now needs to be always enabled, otherwise the driver does not have a
> reliable source of information regarding source_port and switch_id for
> link-local traffic (tag_8021q VLANs may be imprecise since now they
> identify an entire bridging domain when ports are not standalone).
> 
> If we accept that PTP RX timestamping (and therefore, meta frame
> generation) is always enabled in hardware, then that limitation could be
> avoided and packets with any MAC DA can be properly received, because
> meta frames do contain the original bytes from the MAC DA of their
> associated link-local packet.
> 
> This change enables meta frame generation unconditionally, which also
> has the nice side effects of simplifying the switch control path
> (a switch reset is no longer required on hwtstamping settings change)
> and the tagger data path (it no longer needs to be informed whether to
> expect meta frames or not - it always does).
> 
> Fixes: 227d07a07ef1 ("net: dsa: sja1105: Add support for traffic through standalone ports")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian