Steve Wise wrote:
Roland Dreier wrote:
> > What's wrong with my suggestion of having the iwarp driver create an
> > "iwX" interface to go with the normal "ethX" interface? It seems
> > simpler to me, and there's a somewhat similar precedent with how
> > mac80211 devices create both wlan0 and wmaster0 interfaces.
> > - R.
> > It seemed much more painful for me to implement. :-)
> > I'll look into this, but I think for this to be done, the
changes must
> be in the cxgb3 driver, not the rdma driver, because the guts of the
> netdev struct are all private to cxgb3. Remember that this interface
> needs to still do non TCP traffic (like ARP and UDP)...
> > Maybe you have something in mind here that I'm not thinking about?
No, I was just spouting off.
At least someone is looking at my patch. ;-)
But the whole "create a magic alias" seems kind of unfriendly to the
user. Maybe as you said, the cxgb3 net driver could create the alias
for the iw_cxgb3 driver?
I agree that it is not very user friendly.
My current patch just utilizes the IP address alias logic in the IP
stack. So when you do 'ifconfig ethxx:blah ipaddr up' it creates a
struct in_ifaddr which contains a ptr to the real struct net_device that
services this alias. However, from what I can tell, I cannot just
create one of these without binding an address. So the driver cannot
create the alias interface until it knows the ipaddr/netmask/etc. IE:
if you say 'ifconfig ethxx:blah up' it fails... You must supply an
address to get one of these created.
To have the cxgb3 driver create something like 'iw0', I think it would
need to create a full net_device struct. This makes the change much
more complex. But perhaps its the right thing to do...
Steve.
Also, I could defer registering the device with the rdma core until the
alias interface is created by the user. Thus the T3 device wouldn't be
available for use until the ethxx:iw interface is created.
And I could log a WARN or INFO message if the iw_cxgb3 module is loaded
and no ethxx:iw alias exists. This would help clue in the user...
Steve.
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