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Message-ID: <20230418072450.GC30964@pengutronix.de>
Date: Tue, 18 Apr 2023 09:24:50 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Vladimir Oltean <olteanv@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Andrew Lunn <andrew@...n.ch>,
Eric Dumazet <edumazet@...gle.com>,
Florian Fainelli <f.fainelli@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Woojung Huh <woojung.huh@...rochip.com>,
Arun Ramadoss <arun.ramadoss@...rochip.com>,
kernel@...gutronix.de, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v1 2/2] net: dsa: microchip: Add partial ACL
support for ksz9477 switches
On Sun, Apr 16, 2023 at 07:59:04PM +0300, Vladimir Oltean wrote:
> On Thu, Apr 13, 2023 at 06:29:36AM +0200, Oleksij Rempel wrote:
> > According to KSZ9477S 5.2.8.2 Port Priority Control Register
> > "To achieve the desired functionality, do not set more than one bit at a
> > time in this register.
> > ...
> > Bit 6 - OR’ed Priority
> > ...
> > Bit 2 - 802.1p Priority Classification
> > Bit 1 - Diffserv Priority Classification
> > Bit 0 - ACL Priority Classification
> > "
> > @Arun what will happen if multiple engines are used for packet
> > prioritization? For example ACL || Diffserv || 802.1p... ?
> > If I see it correctly, it is possible but not recommended. Should I
> > prevent usage of multiple prio sources?
>
> You could try and find out which one takes priority... we support VLAN
> PCP and DSCP prioritization through the dcbnl application priority table.
What will be the mainlineable interface for the DSCP support for KSZ8 series?
If i see it correctly, it should be possible to use tc:
tc filter add dev lan2 ingress protocol ip flower ip_tos 0x28 skip_sw skbedit priority 7
or dcb:
dcb app add dev lan2 dscp-prio 28:7
dcb implementation seems to have some advantages, since it will
allow to use OpenLLDP to configure traffic priorities. Correct?
Regards,
Oleksij
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