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X-MS-Exchange-CrossTenant-AuthSource: DS0PR11MB7309.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Apr 2026 10:05:55.5905 (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: Ol+ICG5Agb2lFoDx9s6xMdt+6PYlSdNbaZ/a+ivbFzp2XKyPd7blgy3NxTQZSUUPbXqUn73LXwI0wxiq7Co4lE/Mt5RZTdgS02m8c4FpCCA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB7376 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 On Mon, Apr 13, 2026 at 03:34:05PM +0200, Morten Brørup wrote: > > From: David Marchand [mailto:david.marchand@redhat.com] > > Sent: Saturday, 11 April 2026 12.11 > > > > On Fri, 10 Apr 2026 at 16:35, Morten Brørup > > wrote: > > > > > > Is there a workaround until this patch is added, if I don't want > > rte_eal_init() to probe any devices, but I want my application to probe > > devices later by calling rte_bus_scan() followed by rte_bus_probe()? > > > > > > It's not something we really need, so if you don't know it off the > > top of your head, don't spend time trying to figure it out. > > > > Well, starting from the well known -a pci:0000:00:00.0 trick, I wrote > > an incomplete workaround implemented for OVS. > > https://patchwork.ozlabs.org/project/openvswitch/patch/20260226172429.2 > > 12034-3-david.marchand@redhat.com/ > > > > Incomplete, because some buses make life harder with some additional > > parsing restraints (bus/dpaa is the first one that comes to mind) or > > requiring a driver handling the device exists (bus/platform which has > > *no* in-tree driver, though this is a different story..). > > Thanks for all the input, David. > > In my case it's only PCI bus devices, so I found a relatively simple workaround instead of using the "-a" trick. > > I start by not binding the devices to the vfio-pci kernel driver. > Then I call rte_eal_init(); and the devices are not detected by the EAL at this point. > Then I bind the devices to the vfio-pci kernel driver. > And finally I call rte_bus_scan() and rte_bus_probe(); then the devices are detected at this point. > > Note: I have to pass "--iova-mode pa" to EAL init. > Otherwise EAL init chooses VA mode, causing my drivers to not load, with the following message: > "PCI_BUS: Expecting 'PA' IOVA mode but current mode is 'VA', not initializing" > > For anyone following the thread... > > During experimentation, I observed that if the devices were bound to the vfio-pci kernel driver, and "-a ..." was passed to rte_eal_init() it did - as expected - not load the drivers. > However, when calling rte_bus_scan() and rte_bus_probe() afterwards, the drivers were also not auto-detected at this point. > I guess the "-a ..." parameter is sticky, which makes sense. > Yes. The assumption is that, if you don't want to auto-probe, you want to instead add the devices individually, device by device. /Bruce