SR-IOV

[Learner]

Is there a spec or guidelines to follow for implementing/designing SRIOV over nvme...I think the nvme spec doesnt cover SRIOV.

Thanks for your time!

On Aug 22, 2014, at 7:18 AM, Keith Busch <keith.busch at intel.com> wrote:

> On Thu, 21 Aug 2014, sheng qiu wrote:
>> May i ask is SR-IOV currently enabled on the NVMe driver side (linux)
>> ? if not, is there any plan for it?
> 
> It's not implemented in the linux driver, but no one's proposed a patch
> yet either. I've been holding on to this one for a while, but haven't
> been able to test.
> ---
> 
> diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
> index 28aec2d..70b6476 100644
> --- a/drivers/block/nvme-core.c
> +++ b/drivers/block/nvme-core.c
> @@ -2961,6 +2961,24 @@ static int nvme_resume(struct device *dev)
> 
> static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
> 
> +static int nvme_pci_sriov_configure(struct pci_dev *pdev, int numvfs)
> +{
> +    if (!pdev->is_physfn)
> +        return -EPERM;
> +    if (numvfs == 0) {
> +        if (pci_vfs_assigned(pdev)) {
> +            dev_warn(&pdev->dev,
> +                 "Cannot disable SR-IOV VFs while assigned\n");
> +            return -EPERM;
> +        }
> +        pci_disable_sriov(pdev);
> +    }
> +    else
> +        pci_enable_sriov(pdev, numvfs);
> +
> +    return 0;
> +}
> +
> static const struct pci_error_handlers nvme_err_handler = {
>    .error_detected    = nvme_error_detected,
>    .mmio_enabled    = nvme_dump_registers,
> @@ -2988,6 +3006,7 @@ static struct pci_driver nvme_driver = {
>    .driver        = {
>        .pm    = &nvme_dev_pm_ops,
>    },
> +    .sriov_configure = nvme_pci_sriov_configure,
>    .err_handler    = &nvme_err_handler,
> };
> --
> 
> 
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