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Wed, 29 Sep 2021 10:25:59 +0000 Received: from DB8PR04MB5785.eurprd04.prod.outlook.com ([fe80::7c1f:f1c4:3d81:13fc]) by DB8PR04MB5785.eurprd04.prod.outlook.com ([fe80::7c1f:f1c4:3d81:13fc%7]) with mapi id 15.20.4566.014; Wed, 29 Sep 2021 10:25:59 +0000 From: Xiaoliang Yang To: Vinicius Costa Gomes , "davem@davemloft.net" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: "Arvid.Brodin@xdin.com" , "m-karicheri2@ti.com" , "michael.chan@broadcom.com" , "vishal@chelsio.com" , "saeedm@mellanox.com" , "jiri@mellanox.com" , "idosch@mellanox.com" , "alexandre.belloni@bootlin.com" , "ivan.khoronzhuk@linaro.org" , "andre.guedes@linux.intel.com" , "allan.nielsen@microchip.com" , "joergen.andreasen@microchip.com" , Vladimir Oltean , "jhs@mojatatu.com" Subject: RE: [EXT] Re: [RFC, net-next] net: qos: introduce a frer action to implement 802.1CB Thread-Topic: [EXT] Re: [RFC, net-next] net: qos: introduce a frer action to implement 802.1CB Thread-Index: AQHXtFzn8xKeuQxfIEq7ve+HgUSpr6u6CVIAgAC5+yA= Date: Wed, 29 Sep 2021 10:25:58 +0000 Message-ID: References: <20210928114451.24956-1-xiaoliang.yang_1@nxp.com> <87czos9vnj.fsf@linux.intel.com> In-Reply-To: <87czos9vnj.fsf@linux.intel.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: intel.com; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DB8PR04MB5785.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e3861279-166e-4711-6e57-08d98333879a X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Sep 2021 10:25:59.0022 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: RpkwHBiZ4FqiOPMAEbxWeZoegReleudL3K+WrWIj6Vb0jE0xcq+x7BRT0SNFib91VVEd6l3WAK+ija5B77GqEY/C/jTDWuBji6nU5wNr8mY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB5786 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. > > >=20 > An action seems, to me, a bit too limiting/fine grained for a frame repli= cation > and elimination feature. >=20 > At least I want to hear the reasons that the current hsr/prp support cann= ot be > extended to support one more tag format/protocol. >=20 > And the current name for the spec is IEEE 802.1CB-2017. >=20 802.1CB 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 802.1C= B-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