Re: [PATCH v3 0/7] Rework device probing

[Kevin Traynor <ktraynor@redhat.com>]

On 4/10/26 3:34 PM, 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.
> 

The workaround we have used is '-a 0000:00:00.0' Only allowing a dummy
device, hence other devices are hotplugged as needed.

> 
> Venlig hilsen / Kind regards,
> -Morten Brørup
> 
>> -----Original Message-----
>> From: David Marchand [mailto:david.marchand@redhat.com]
>> Sent: Tuesday, 7 April 2026 13.52
>> To: dev@dpdk.org
>> Subject: [PATCH v3 0/7] Rework device probing
>>
>> Applications relying on device hotplug don't work well with the default
>> probing of all available resources.
>> This series proposes to change this behavior via a new EAL option.
>>
>>
>> --
>> David Marchand
>>
>> Changes since v2:
>> - rebased for late 26.03 fslmc bus changes,
>> - fixed devargs lookup,
>> - added debug logs,
>>
>> Changes since v1:
>> - restored per bus scan mode,
>> - fixed logic in device selection for dma/idxd,
>> - fixed raw/ifpga hotplug on ifpga bus,
>> - fixed some doxygen,
>>
>> Changes since RFC v3:
>> - removed per bus scan mode,
>>
>> Changes since RFC v2:
>> - went one step further and reworked devargs lookup in buses following
>>   Bruce comment (see patch 4 which is cosmetic, and patch 5),
>> - updated device selection helper accordingly and
>>   changed API to be device name based,
>> - renamed option, added check on -b presence, updated doc in the last
>>   patch,
>>
>> Changes since RFC v1:
>> - reviewed bus probe() and cleaned up NXP drivers,
>> - changed approach following Bruce comment,
>>
>> David Marchand (7):
>>   devtools: check packet forwarding in null test
>>   bus/fslmc: fix bus cleanup
>>   drivers/bus: require probe function for NXP drivers
>>   drivers/bus: cleanup devargs lookup in scan
>>   bus: factorize devargs lookup
>>   bus: factorize device selection
>>   eal: configure initial device probing
>>
>>  app/test/test_eal_flags.c                    | 63 ++++++++++++++++
>>  devtools/test-null.sh                        | 10 ++-
>>  doc/guides/linux_gsg/eal_args.include.rst    | 13 ++++
>>  drivers/bus/auxiliary/auxiliary_common.c     | 33 +--------
>>  drivers/bus/auxiliary/bus_auxiliary_driver.h |  2 -
>>  drivers/bus/auxiliary/linux/auxiliary.c      |  2 +-
>>  drivers/bus/auxiliary/private.h              |  6 --
>>  drivers/bus/cdx/cdx.c                        | 34 +--------
>>  drivers/bus/dpaa/dpaa_bus.c                  | 71 ++++++++----------
>>  drivers/bus/fslmc/fslmc_bus.c                | 75 ++++++++------------
>>  drivers/bus/fslmc/fslmc_vfio.c               | 21 ++----
>>  drivers/bus/ifpga/ifpga_bus.c                |  8 ++-
>>  drivers/bus/pci/bsd/pci.c                    |  5 +-
>>  drivers/bus/pci/linux/pci.c                  |  2 +-
>>  drivers/bus/pci/pci_common.c                 | 51 ++++---------
>>  drivers/bus/pci/private.h                    | 11 ---
>>  drivers/bus/pci/windows/pci.c                |  4 +-
>>  drivers/bus/platform/platform.c              | 43 +----------
>>  drivers/bus/uacce/uacce.c                    | 39 +---------
>>  drivers/bus/vdev/vdev.c                      |  2 +-
>>  drivers/bus/vmbus/linux/vmbus_bus.c          |  2 +-
>>  drivers/bus/vmbus/private.h                  |  3 -
>>  drivers/bus/vmbus/vmbus_common.c             | 45 +++---------
>>  drivers/dma/idxd/idxd_bus.c                  | 18 +----
>>  lib/eal/common/eal_common_bus.c              | 54 ++++++++++++++
>>  lib/eal/common/eal_common_options.c          | 10 +++
>>  lib/eal/common/eal_internal_cfg.h            |  1 +
>>  lib/eal/common/eal_option_list.h             |  2 +
>>  lib/eal/include/bus_driver.h                 | 38 ++++++++++
>>  29 files changed, 301 insertions(+), 367 deletions(-)
>>
>> --
>> 2.53.0
>