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    SubjectRe: [PATCH RFC] iw_cxgb3: Support "iwarp-only" interfaces to avoid 4-tuple conflicts with the host stack.


    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.

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