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charset="us-ascii" Content-ID: <8BA9500280EDB04E8D5A3434AC3896A1@eurprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5136.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f497b6f5-8f3b-4988-fbae-08d984f6ec75 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Oct 2021 16:17:11.1773 (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: sRAATmoNkENWtFNpL6BAAXyeAocWGH6aKl2Nu0eOk8errl54QEnwsToN3mNS8KtknriJluXANrRnAadzrcKI7Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR04MB7471 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vinicius, On Wed, Sep 29, 2021 at 10:25:58AM +0000, Xiaoliang Yang wrote: > 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 rep= lication > > and elimination feature. > > > > At least I want to hear the reasons that the current hsr/prp support ca= nnot 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. Did Xiaoliang answer your question satisfactorily? :)=