Re: [dpdk-dev] Making rte_eal_pci_probe() in rte_eal_init() optional?

["Roger B. Melton" <rmelton@cisco.com>]

Hi David,

We are on a very old kernel (2.6.xx) that lacks VFIO.  In the future 
however, after migration to a newer kernel it will be an option.

I like the "-b all" and "-w none" idea, but I think it might be 
complicated to implement it the way we would need it to work.  The 
existing -b and -w options  persist for the duration of the application, 
and we would need the "-b all"/"-w none" to persists only through 
rte_eal_init() time.  Otherwise our attempt to to attach a device at a 
later time would be blocked by the option.

Wouldn't it be simpler to have an option to disable the rte_eal_init() 
time the probe.  Would that address the issue with VFIO, prevent 
automatically attaching to devices while permitting on demand attach?

Thanks again.

Regards,
-Roger



On 11/14/15 12:51 PM, David Marchand wrote:
> Hello Roger,
>
> On Sat, Nov 14, 2015 at 4:55 PM, Roger B. Melton <rmelton@cisco.com 
> <mailto:rmelton@cisco.com>> wrote:
>
>     Agreed.  For our application, the debug case would be to _enable_
>     the PCI scan.
>
>     Again, thanks David for pointing it out.  It did solve our problem.
>
>
> The only problem with --no-pci is that I think that vfio won't work 
> properly if used.
>
> Did you try to blacklist all your devices then attach them later ?
> I would say what you need here is to "blacklist all" or "whitelist 
> none" at startup, so maybe a special keyword for -b/-w options.
>
>
> -- 
> David Marchand

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