# Re: \[PATCH for-next 01/10\] net/core: Add support for configuring VF GUIDs

- From: Jason Gunthorpe \<hidden\>
- Date: 2016-03-01 18:25:16 
- List: netdev
- Page: https://ratatoskr.run/netdev/2016/03/11011602
- Thread: https://ratatoskr.run/linux-rdma/2016/03/11011602/t.md

```text
On Tue, Mar 01, 2016 at 07:49:51PM +0200, Eli Cohen wrote:
> On Tue, Mar 01, 2016 at 10:37:51AM -0700, Jason Gunthorpe wrote:
> > > +	return handle_infiniband_guid(dev, &ivt, IFLA_VF_IB_PORT_GUID);
> > 
> > But is this emulation really necessary? It seems dangerous and
> > continues the bad practice of assuming IFLA_VF_MAC is fixed to 6 bytes
> > in size, and is not just LLADDR bytes. I'd rather see mac sets fail on
> > IB.
> > 
> struct ifla_vf_mac  already defines mac as 32 bytes but the idea here
> is that applications that configure six byte Ethernet MACs to VFs will
> continue to work without any change. 

In my view it is incorrect for an application to try and set a 6 byte
mac on an *infiniband* interface, the kernel should refuse to do it.

Jason
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```