On Mon, 2017-02-27 at 22:58 +0000, Will Del Genio wrote:
> Hello,
>  
> I’m currently working on testing the hotplug support for local PCIe
> connected NVMe drives (P3700s and 3600s at the moment) on linux.
> (Linux sb1 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC
> 2017 x86_64 x86_64 x86_64 GNU/Linux)
>  
> Right now spdk requires the setup script to be manually run which
> unbinds the nvme driver and binds the uio_pci_generic driver.  Is
> there a way to have that happen automatically on hotplugging of an
> nvme device?  From what I understand it could be done via script
> called by a udev rule.

You can change which devices the kernel assigns to which drivers by
writing to /sys/bus/pci/drivers/.../new_id and
/sys/bus/pci/drivers/.../remove_id. See 
https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-pci

If you change NVMe devices to automatically be bound to
uio_pci_generic, then SPDK will pick them up in the next
call to spdk_nvme_probe().

>  
> Is that the right way to handle it?  Are there any other plans for
> hotplug support moving forward I should be aware of?
>  
> Thanks for the help,
> Will Del Genio
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