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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB3530.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2a6e9f89-81d8-4423-223a-08db29e800cd X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Mar 2023 08:41:02.5496 (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: lObL5pJ1DYgedeug4XSTm2+O7qbW+jK2fpAMHSL1UsHe5l7AJU9wBRCNwZBWs42b0Ncmp0Nbl2creci5Cr0hGQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB6334 X-OriginatorOrg: intel.com 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 Hi Thomas, > -----Original Message----- > From: Thomas Monjalon > Sent: Tuesday, March 21, 2023 16:14 > To: Huang, Wei > Cc: dev@dpdk.org; david.marchand@redhat.com; stable@dpdk.org; Xu, > Rosen ; Zhang, Tianfei ; > Zhang, Qi Z > Subject: Re: [PATCH v1] raw/ifpga: remove virtual device unplug operation >=20 > 21/03/2023 01:11, Huang, Wei: > > From: Thomas Monjalon > > > 16/03/2023 21:44, Wei Huang: > > > > VDEV bus has implemented cleanup() function to perform cleanup for > > > > devices on the bus during eal_cleanup(), so there is no need for > > > > ifpga driver to record virtual devices and unplug them. > > > > > > Why no need? > > > If the application wants to explicitly remove a device, what happens? > > > > > > > > EAL will output an error information "Cannot find plugged device (%s)". >=20 > It does not look what we expect. >=20 Let me clear it. With this patch, no error information will be outputted. Without this patch, error information will be outputted. Because bus cleanu= p action will unplug virtual device, then ifpga PMD unplug the virtual devi= ce which is already be cleanup, bus->find_device() returns NULL, EAL output= "Cannot find plugged device (%s)\n" at line 302 in eal_common_dev.c