Re: [SPDK] "Requested device XXX cannot be used" warning in device detach procedure may be misleading

[Walker, Benjamin <benjamin.walker at intel.com>]

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On Mon, 2017-03-13 at 12:28 +0800, Freeman Zhang wrote:
> Hi
> 
> On 3/13/17 12:03 PM, Chang, Cunyin wrote:
> > 
> > Actually, the error message caused by the function
> > spdk_pci_device_detach(), after we detach the device, we try to
> > call the function
> > rte_eal_pci_probe_one(), but we do not have callback function for
> > the dpdk nvme driver at this point, so the error message show up, 
> > but  this function will add the device back to dpdk pci device
> > list, then we could probe the device next time when
> > we want to use it again. So it has no adverse effects but just one
> > error message, but we still trying to fix it now.
> > 
> 
> Thanks for your reply!
> 
> I've noticed it and that is why I think it's kind of misleading. So I
> guess we should not focus only on reusing codes but also making it
> clearer for both users and developers.

The problem is that DPDK is not exposing a public API to do the
operation we need to do (unload a driver but not remove it entirely
from the list of PCI devices). We're working with the DPDK team to add
a public API to do that while also investigating better ways to work
around the issue that don't leave us with this confusing error message.

> 
> 
> All the best!
> Freeman
> 
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