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Fri, 8 Jun 2018 00:39:30 +0000 From: Yongseok Koh To: =?iso-8859-1?Q?N=E9lio_Laranjeiro?= , "Adrien Mazarguil" CC: Shahaf Shuler , "dev@dpdk.org" Thread-Topic: [RFC v1] net/mlx5: support new completion field for Multi-Packet RQ Thread-Index: AQHT/sEpYBEvHzEXuk+/U/Eu1fNYOw== Date: Fri, 8 Jun 2018 00:39:30 +0000 Message-ID: <2FC8357D-4964-41BE-98D2-D3BE75F85E00@mellanox.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=yskoh@mellanox.com; x-originating-ip: [209.116.155.178] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; VI1PR0501MB2781; 7:q9Oo+igTRgie6qbBWnPsLq3XFdjdbRnGtgNQbu/VRn5VrHHeb3riKIzb0GdnZSBsgN4SZ/Mkiwpk/H3BU/qU7vs/yp9a3v5vgf5vWmrofOdcCfAAgFDZxIN8zAgJU3GgL11Q4NVcG/9IK1TEhvrw8tlbhPywGcl4Cmbou6Hw+h4jZXaRsthayySqdI08hU6z4GWnxmSme/jGtsklxBNHq2jF6ME8i7qO2qNYUKwWOfgwDExkwZr7N6Z7nr5cViy5 x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:; 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DIR:OUT; SFP:1101; SCL:1; SRVR:VI1PR0501MB2781; H:VI1PR0501MB2045.eurprd05.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: inPvSuaC5futyW01eWcls5HaEQM4MvmHM+NwYMaXC9oCoyOMdD4ikiCfDmCieaVojuzTsHbRaZuOc57QHj74G07BCivhuon4ZUxCOADng18E7qINFgL7mrs+TH7Rxw/lyRxe38cy4CwmsbfeHQBkQl0AEw79V3UStolnvyQpMNJEu6+FxgkexrZZMBTokmde spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-ID: <035367D8DDE0C94CBCF843CCBF202E67@eurprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 3883f7dc-d470-4943-e97c-08d5ccd84c51 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3883f7dc-d470-4943-e97c-08d5ccd84c51 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jun 2018 00:39:30.7301 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0501MB2781 Subject: [dpdk-dev] [RFC v1] net/mlx5: support new completion field for Multi-Packet RQ X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Jun 2018 00:39:32 -0000 Multi-Packet Receive Queue is to receive multiple packets on a single large buffer. As it is supposed to have Rx CQEs in order from HW, 'consumed_stride' in CQE is accumulated to keep track of the current stride index. However, it is safer to directly use 'stride_idx' in CQE to avoid out-of-order situation which can possibly be caused by introducing new features in the future. If Rx CQE compression is enabled, HW can be configured to store the 'stride_idx' in a mini-CQE but this will need newer version of library/driver along with firmware changes. Signed-off-by: Yongseok Koh