[PATCH v3 7/7] eal: configure initial device probing

[fengchengwen]

Acked-by: Chengwen Feng <fengchengwen at huawei.com>

On 4/7/2026 7:52 PM, David Marchand wrote:
> Some applications use port hotplug as their primary way for using DPDK
> resources.
> Having a systematic device probing is a problem when not all available
> resources will be used by the application, as such applications won't set
> an explicit allow list at startup.
> 
> This is the case for OVS on systems with multiple mlx5 devices:
> one device can be used by the kernel while the other(s) are used by DPDK.
> In such a setup, the kernel used device may get reconfigured in
> unexpected ways and trigger issues like the one described by Kevin
> not so long ago in bugzilla 1873.
> 
> Add an EAL option so that we can change the default behavior from
> block-listing to allow-listing which can be summed up as disabling
> automatic probing.
> In case some applications want to require automatic probing, add the
> opposite option.
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> Acked-by: Bruce Richardson <bruce.richardson at intel.com>
> Reviewed-by: Robin Jarry <rjarry at redhat.com>
> Acked-by: Hemant Agrawal <hemant.agrawal at nxp.com>
> Tested-by: Maxime Leroy <maxime at leroys.fr>
> Acked-by: Kevin Traynor <ktraynor at redhat.com>