netdev - Re: New commands to configure IOV features

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Date:	Wed, 19 Sep 2012 17:19:47 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Yuval Mintz <yuvalmin@...adcom.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ariel Elior <ariele@...adcom.com>,
	Eilon Greenstein <eilong@...adcom.com>,
	linux-pci <linux-pci@...r.kernel.org>
Subject: Re: New commands to configure IOV features

On Wed, Sep 19, 2012 at 3:46 PM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> On Wed, 2012-09-19 at 15:17 -0700, Yinghai Lu wrote:
>> +max_vfs_store(struct device *dev, struct device_attribute *attr,
>> +                const char *buf, size_t count)
>> +{
>> +       unsigned long val;
>> +       struct pci_dev *pdev = to_pci_dev(dev);
>> +
>> +       if (strict_strtoul(buf, 0, &val) < 0)
>> +               return -EINVAL;
>> +
>> +       pdev->max_vfs = val;
>> +
>> +       return count;
>> +}
> [...]
>
> Then what would actually trigger creation of the VFs?  There's no way we
> can assume that some sysfs attribute will be written before the PF
> driver is loaded (what if it's built-in?).  I thought the idea was to
> add a driver callback that would be called when the sysfs attribute was
> written.

could just stop the device and add it back again?

just like updated patch.

Thanks

Yinghai

Download attachment "sriov_xxx.patch" of type "application/octet-stream" (3664 bytes)