linux-kernel - Re: [SR-IOV driver example 2/3] PF driver: integrate with SR-IOV core

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Date:	Tue, 2 Dec 2008 00:44:27 +0800
From:	Yu Zhao <yu.zhao@...el.com>
To:	Greg KH <greg@...ah.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"matthew@....cx" <matthew@....cx>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [SR-IOV driver example 2/3] PF driver: integrate with SR-IOV
	core

On Thu, Nov 27, 2008 at 12:58:59AM +0800, Greg KH wrote:
> On Wed, Nov 26, 2008 at 10:21:56PM +0800, Yu Zhao wrote:
> > +			my_mac_addr[5] = (unsigned char)i;
> > +			igb_set_vf_mac(netdev, i, my_mac_addr);
> > +			igb_set_vf_vmolr(adapter, i);
> > +		}
> > +	} else
> > +		printk(KERN_INFO "SR-IOV is disabled\n");
> 
> Is that really true?  (oh, use dev_info as well.)  What happens if you
> had called this with "5" and then later with "0", you never destroyed
> those existing virtual functions, yet the code does:
> 
> > +	adapter->vfs_allocated_count = nr_virtfn;
> 
> Which makes the driver think they are not present.  What happens when
> the driver later goes to shut down?  Are those resources freed up
> properly?

For now we hard-code the tx/rx queues allocation so this doesn't
matter. Eventually this will become dynamic allocation: when number
of VFs changes the corresponding resources need to be freed.

I'll put more comments here.

Thanks,
Yu
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