[dpdk-dev] Making rte_eal_pci_probe() in rte_eal_init() optional?
Roger B. Melton
rmelton at cisco.com
Fri Nov 13 13:07:00 CET 2015
Hi David,
On 11/13/15 3:49 AM, David Marchand wrote:
> Hello Roger,
>
> On Thu, Nov 12, 2015 at 11:43 PM, Roger B Melton <rmelton at cisco.com
> <mailto:rmelton at cisco.com>> wrote:
>
> Hi folks,
>
> With the addition of hot plug support we have been migrating away
> from device discovery and attach at initialization time to a model
> where it is controlled from a separate process. The separate
> process manages the binding of devices to UIO and instructs the
> DPDK process when to attach. One of the problems we stumbled onto
> was that if our control process discovered devices and bound them
> to UIO before our DPDK process started, then rte_eal_init() would
> discover and attach to those devices via the rte_eal_pci_probe()
> invocation. This caused problems later on when when our control
> process, instructed our DPDK process to attach to a device.
>
> There are a number of ways we could address this, but the simplest
> is to prevent the rte_eal_pci_probe() at rte_eal_init() time. In
> our model we will never need it and I suspect others may also be
> in that boat.
>
> What are your thoughts on adding an argument to instruct
> rte_eal_init() to skip the PCI probe?
>
>
> Did you try the --no-pci option ?
> It avoids the initial sysfs scan, so with no pci device, the initial
> pci_probe should do nothing.
>
> Attaching devices later will trigger this sysfs scan and only probe
> the requested device.
> I am not totally happy with the way it is done right now, but I think
> this should work for you.
I saw it, but I was so caught up in the probe that I didn't consider
that delaying the scan until attach time might solve the problem.
I'll give it shot. Thanks for pointing it out David.
Regards,
-Roger
>
>
> --
> David Marchand
--
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