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From: Andrew Lunn <>
To: Vladimir Oltean <>
Cc: "David S. Miller" <>,
	Jakub Kicinski <>,, Ido Schimmel <>,
	Petr Machata <>,
	Alexander Duyck <>,
	Jamal Hadi Salim <>,
	Cong Wang <>,
	Jiri Pirko <>,,
Subject: Re: [RFC PATCH net-next 1/2] net: dsa: allow setting port-based QoS priority using tc matchall skbedit
Date: Thu, 14 Jan 2021 00:41:28 +0100
Message-ID: <X/> (raw)
In-Reply-To: <>

On Wed, Jan 13, 2021 at 05:41:38PM +0200, Vladimir Oltean wrote:
> From: Vladimir Oltean <>
> In Time Sensitive Networking it is a common and simple use case to
> configure switches to give all traffic from an attached station the same
> priority, without requiring those stations to use VLAN PCP or IP DSCP to
> signal the priority that they want. Many pieces of hardware support this
> feature via a port-based default priority. We can model this in Linux
> through a matchall action on the ingress qdisc of the port, plus a
> skbedit priority action with the desired priority.

The mv88e6xxx has something similar. There is a bit to enable this
feature, as well as the priority the feature should have. I think that
then takes a value in the range of 0 to 4, but i could be remembering
it wrongly.

> +	int	(*port_priority_set)(struct dsa_switch *ds, int port,
> +				     struct dsa_mall_skbedit_tc_entry *skbedit);

The fact we can turn this on/off suggests there should be a way to
disable this in the hardware, when the matchall is removed. I don't
see any such remove support in this patch.


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-13 15:41 [RFC PATCH net-next 0/2] Port-based priority on DSA switches using tc-matchall Vladimir Oltean
2021-01-13 15:41 ` [RFC PATCH net-next 1/2] net: dsa: allow setting port-based QoS priority using tc matchall skbedit Vladimir Oltean
2021-01-13 23:41   ` Andrew Lunn [this message]
2021-01-14  0:17     ` Vladimir Oltean
2021-01-14  1:02       ` Andrew Lunn
2021-01-13 15:41 ` [RFC PATCH net-next 2/2] net: dsa: felix: offload port priority Vladimir Oltean
2021-01-13 23:36   ` Andrew Lunn
2021-01-13 23:37     ` Florian Fainelli
2021-01-14  0:57       ` Vladimir Oltean

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