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Wed, 6 Jan 2021 16:05:43 +0000 From: "Trahe, Fiona" To: Matan Azrad , "ashish.gupta@marvell.com" CC: "dev@dpdk.org" , NBU-Contact-Thomas Monjalon , "Trahe, Fiona" Thread-Topic: DPDK compress API - questions Thread-Index: AdbkRJ94wR9lTRgGT+yPBXR/XbWdfQAANUUA Date: Wed, 6 Jan 2021 16:05:43 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: nvidia.com; dkim=none (message not signed) header.d=none;nvidia.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [51.37.6.252] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: c49c6153-7f5c-44e9-bb78-08d8b25ceba1 x-ms-traffictypediagnostic: BN6PR1101MB2132: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 59RDneq8j0iFbbpWaTTZURgbBO34rEIZfX4dWvXHFAT0z3ltn1emorNkcqlIZju4Hr4+382Tx5/EeJvex1lU8nJ2yQNQtI1r1d2QRsG8yQqmd5284VzdHPejcWqrdwiSwPke3Hf40C78OC3n+DAsalRfT0Y6qvbexJ2N4/xjBZ0m83AMlL4UBLIvkINWDEsat0nwYpgEb9/SxB0tLaVCSX2ICKISZrd/JyKJoNzH5RNrdu1Pxm1nUxiDz3XP3xRxljb+ckU3gmgDtDG3LwYW4S0o2i6nOUfF/y7jhq0tzPetTMjxo/yFnXc+KBHCamL8x5ZkLX38FiskC+5fyi+nApQ+MTL5JB6ScM2pgK7RlW8B6NB5uAaFx8f/vyKRMaUvB3AzcVmBfSMewfhF6c3Q4g== x-forefront-antispam-report: CIP:255.255.255.255; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN7PR11MB2865.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c49c6153-7f5c-44e9-bb78-08d8b25ceba1 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jan 2021 16:05:43.2275 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Qb3S99iB8V2vYbgX9KSTVpUmEILtcN8oHaPN1/eMO2Uaii1Ss8ny4jZxWlIYpTckPY95KpjJa9JybYXpeIHXkw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR1101MB2132 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] DPDK compress API - questions X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Matan Azrad =20 Sent: Wednesday, January 6, 2021 3:57 PM To: Trahe, Fiona ; ashish.gupta@marvell.com Cc: dev@dpdk.org; NBU-Contact-Thomas Monjalon Subject: DPDK compress API - questions Hi Fiona, Ashish I'm going to add new HW offload compress PMD for mlx5 devices in 21.02. I have some questions on the API: #define RTE_COMP_FF_NONCOMPRESSED_BLOCKS=A0=A0=A0=A0=A0=A0=A0 (1ULL << 11) /**< Creation of non-compressed blocks using RTE_COMP_LEVEL_NONE is support= ed */ 1. What does it mean non-compressed block ? DMA? [Fiona] Not exactly. E.g. for Deflate, if the output is non-compressed bloc= ks, it still has the deflate headers. So is not a direct DMA of the input data. As this may not be supported by a= ll PMDs it is exposed in a feature flag. 2. Does Using RTE_COMP_LEVEL_NONE or RTE_COMP_ALGO_NULL the same? [Fiona] No. ALGO_NULL would be DMA. /**< No compression. * Pass-through, data is copied unchanged from source buffer to * destination buffer. */ LEVEL_NONE should output the data in the correct format for the specified a= lgorithm. Probably I will add more question later. Thanks Matan