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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM0PR05MB6707.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e6da2962-feb3-4835-dda4-08d82f04c686 X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Jul 2020 12:34:42.8603 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jIKIMBjp7DJg6BFiklluzhJ4kMx9XZi1FvswPXU5taOPz6+ZsjF0Dbh6XKYycjIaQ2U4RHp3kDXvwvQtxWsHBA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR05MB4403 Subject: Re: [dpdk-dev] [PATCH] net/mlx5: fix UAR memory mapping type 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: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi, > -----Original Message----- > From: Ori Kam > Sent: Thursday, July 23, 2020 2:58 PM > To: Slava Ovsiienko ; dev@dpdk.org > Cc: Matan Azrad ; Raslan Darawsheh > ; Thomas Monjalon ; > Dekel Peled > Subject: RE: [dpdk-dev] [PATCH] net/mlx5: fix UAR memory mapping type >=20 >=20 >=20 > > -----Original Message----- > > From: dev On Behalf Of Viacheslav Ovsiienko > > > > The User Access Region is a special mechanism to provide direct > > access to the hardware registers, and is the part of PCI address > > space that is mapped to CPU virtual address. The mapping can be > > performed with the type "Write-Combining" or "Non-Cached", and > > these ones might be supported or not on different setups. > > > > To prevent device probing failure the UAR allocation attempt > > with alternative mapping type is performed. The datapath > > takes the actual UAR mapping into account on queue creation. > > > > There was another issue with NULL UAR base address. > > OFED 5.0.x and Upstream rdma_core before v29 returned the NULL as > > UAR base address if UAR was not the first object in the UAR page. > > It caused the PMD failure and we should try to get another UAR > > till we get the first one with non-NULL base address returned. > > > > Fixes: fc4d4f732bbc ("net/mlx5: introduce shared UAR resource") > > > > Signed-off-by: Viacheslav Ovsiienko > > --- > > -- > > 1.8.3.1 >=20 > Acked-by: Ori Kam > Thanks, > Ori Patch applied to next-net-mlx, Kindest regards, Raslan Darawsheh