[dpdk-dev] Regarding VM live migration with SRIOV

[Prashant Upadhyaya]

Hi Stephen,

Agreed that the current code does not directly support hotplug.

Now I am looking for a hint regarding how best the DPDK application can find out that the PCI device on which it was doing the I/O has been removed from underneath. In that case the application can call the ethdev stop and ethdev close functions gracefully.
Question is -- is there a way for the PMD to know that the device is gone.

Further the PCI device is a mapped memory, so when the plugout of the PCI device happen, is the DPDK application, which is doing I/O, vulnerable to a crash ?

Regards
-Prashant


-----Original Message-----
From: Stephen Hemminger [mailto:stephen at networkplumber.org]
Sent: Wednesday, November 27, 2013 11:54 AM
To: Prashant Upadhyaya
Cc: dev at dpdk.org
Subject: Re: [dpdk-dev] Regarding VM live migration with SRIOV

On Wed, 27 Nov 2013 11:39:28 +0530
Prashant Upadhyaya <prashant.upadhyaya at aricent.com> wrote:

> Hi Stephen,
>
> The rte_eal_pci_probe is typically called at the startup.
>
> Now let's say a DPDK application is running with a PCI device (doing
> tx and rx) and I remove that PCI device underneath (hot plugout) So how does the application now know that the device is gone ?
>
> Is it that rte_eal_pci_probe should be called periodically from, let's say, the slow control path of the DPDK application ?
>
> Regards
> -Prashant
>

Like I said current code doesn't do hotplug.
If you wanted to add it, you would have to refactor the PCI management layer.






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