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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: marvell.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CO6PR18MB3873.namprd18.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 23e3d235-6f79-4c16-3336-08d8ed4b827f X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Mar 2021 15:59:43.8279 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 70e1fb47-1155-421d-87fc-2e58f638b6e0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /IF44HrDh19D+82Nk1vspr2NhrS1JLibi8RHDYlFLSvvp14t+2ny2RJD75437MnP5q1vWZFRZxz05D5NZqeLVQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR18MB1166 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-22_08:2021-03-22,2021-03-22 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > 2. CM3 code has very small footprint requirement, we cannot=20 > > implement the complete Serdes and PHY infrastructure that kernel=20 > > provides as part of CM3 application. Therefore I would like to=20 > > continue relying on kernel configuration for that. >=20 > How can that work? How does Linux know when CM3 has up'ed the=20 > interface? CM3 won't use this interface till ethtool priv flag was set, it can be done= by communication over CM3 SRAM memory. > How does CM3 know the status of the link? CM3 has access to MAC registers and can read port status bit. > How does CM3 set its > flow control depending on what auto-neg determines, etc? Same as PPv2 Packet Processor RX and TX flow don't really care about auto-n= eg, flow control, etc. CM3 can ignore it, all this stuff handled in MAC layer. CM3 just polling RX= descriptor ring and using TX ring for transmit.=20 >=20 > > 3. In some cases we need to dynamically switch the port "user" > > between CM3 and kernel. So I would like to preserve this=20 > > functionality. >=20 > And how do you synchronize between Linux and CM3 so you know how is=20 > using it and who cannot use it? >=20 > Andrew I can add CM3 SRAM update into ethtool priv flag callback, so CM3 won't use= port till it was reserved to CM3. Stefan.