linux-kernel - RE: [EXT] Re: [PATCH v2 net-next 00/10] net: ocelot: VCAP IS1 and ES0 support

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Message-ID: <DB8PR04MB5785D8DA658A4557973EA233F08B0@DB8PR04MB5785.eurprd04.prod.outlook.com>
Date:   Tue, 2 Jun 2020 08:49:58 +0000
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Po Liu <po.liu@....com>, Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Leo Li <leoyang.li@....com>, Mingkai Hu <mingkai.hu@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "Allan W. Nielsen" <allan.nielsen@...rochip.com>,
        Joergen Andreasen <joergen.andreasen@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "linux-devel@...ux.nxdi.nxp.com" <linux-devel@...ux.nxdi.nxp.com>
Subject: RE: [EXT] Re: [PATCH v2 net-next 00/10] net: ocelot: VCAP IS1 and ES0
 support

Hi Vladimir,

On Tus, 2 Jun 2020 at 16:04,
> First of all, net-next has just closed yesterday and will be closed for the following 2 weeks:
> https://eur01.safelinks.protection.outlook.com/?url=http:%2F%2Fvger.kernel.org%2F~davem%2Fnet-next.html&amp;data=02%7C01% 7Cxiaoliang.yang_1%40nxp.com%7C2fad4495dabc4f4ca5fd08d806cb70af%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637266818117666386&amp;sdata=ziVybWb4HzYXanehF5KwNv5RJL%2BZz6NeFvrZWg657B8%3D&amp;reserved=0
>
> Secondly, could you give an example of how different chains could express the fact that rules are executed in parallel between the IS1,
> IS2 and ES0 TCAMs?
>

Different TCAMs are not running in parallel, they have flow order: IS1->IS2->ES0. Using goto chain to express the flow order. 
For example:
	tc qdisc add dev swp0 ingress
	tc filter add dev swp0 chain 0 protocol 802.1Q parent ffff: flower skip_sw vlan_id 1 vlan_prio 1 action vlan modify id 2 priority 2 action goto chain 1
	tc filter add dev swp0 chain 1 protocol 802.1Q parent ffff: flower skip_sw vlan_id 2 vlan_prio 2 action drop
In this example, package with (vid=1,pcp=1) vlan tag will be modified to (vid=2,pcp=2) vlan tag on IS1, then will be dropped on IS2.

If there is no rule match on IS1, it will still lookup on IS2. We can set a rule on chain 0 to express this:
	tc filter add dev swp0 chain 0 parent ffff: flower skip_sw action goto chain 1

In addition, VSC9959 chip has PSFP and "Sequence Generation recovery" modules are running after IS2, the flow order like this: IS1->IS2->PSFP-> "Sequence Generation recovery" ->ES0, we can also add chains like this to express these two modules in future.

BTW, where should I sent patches to due to net-next closed?

Thanks,
Xiaoliang Yang