netdev - RE: [EXT] Re: [RFC, net-next] net: qos: introduce a frer action to implement 802.1CB

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Date:   Wed, 29 Sep 2021 10:25:58 +0000
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Arvid.Brodin@...n.com" <Arvid.Brodin@...n.com>,
        "m-karicheri2@...com" <m-karicheri2@...com>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "vishal@...lsio.com" <vishal@...lsio.com>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>,
        "jiri@...lanox.com" <jiri@...lanox.com>,
        "idosch@...lanox.com" <idosch@...lanox.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "ivan.khoronzhuk@...aro.org" <ivan.khoronzhuk@...aro.org>,
        "andre.guedes@...ux.intel.com" <andre.guedes@...ux.intel.com>,
        "allan.nielsen@...rochip.com" <allan.nielsen@...rochip.com>,
        "joergen.andreasen@...rochip.com" <joergen.andreasen@...rochip.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "jhs@...atatu.com" <jhs@...atatu.com>
Subject: RE: [EXT] Re: [RFC, net-next] net: qos: introduce a frer action to
 implement 802.1CB

Hi Vinicius,

On Sep 29, 2021 at 6:35:59 +0000, Vinicius Costa Gomes wrote:
> > This patch introduce a frer action to implement frame replication and
> > elimination for reliability, which is defined in IEEE P802.1CB.
> >
> 
> An action seems, to me, a bit too limiting/fine grained for a frame replication
> and elimination feature.
> 
> At least I want to hear the reasons that the current hsr/prp support cannot be
> extended to support one more tag format/protocol.
> 
> And the current name for the spec is IEEE 802.1CB-2017.
> 
802.1CB can be set on bridge ports, and need to use bridge forward
Function as a relay system. It only works on identified streams,
unrecognized flows still need to pass through the bridged network
normally.

But current hsr/prp seems only support two ports, and cannot use the
ports in bridge. It's hard to implement FRER functions on current HSR
driver.

You can see chapter "D.2 Example 2: Various stack positions" in IEEE 802.1CB-2017,
Protocol stack for relay system is like follows:

             Stream Transfer Function
                |             |
  				|    	Sequence generation
                |       	Sequence encode/decode
  Stream identification		Active Stream identification
				|			  |
  			    |		Internal LAN---- Relay system forwarding
				|						|		|
				MAC						MAC		MAC

Use port actions to easily implement FRER tag add/delete, split, and
recover functions.

Current HSR/PRP driver can be used for port HSR/PRP set, and tc-frer
Action to be used for stream RTAG/HSR/PRP set and recover.

Thanks,
Xiaoliang