Messages in this thread | | | From | "Hefty, Sean" <> | Subject | RE: [PATCH v6 01/26] IB/Verbs: Implement new callback query_transport() | Date | Tue, 28 Apr 2015 06:14:15 +0000 |
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> > Keep in mind that this enum was Liran's response to Michael's original > > patch. In the enum in Michael's patch, there was both USNIC and > > USNIC_UDP. > > Right! That's why I'm confused. Seems wrong to drop it, right?
I think the original USNIC protocol is layered directly over Ethernet. The protocol basically stole an Ethertype (the one used for IBoE/RoCE) and implemented a proprietary protocol instead. I have no idea how you resolve that, but I also don't think it's used anymore. USNIC_UDP is just UDP.
> Well, if RoCEv2 uses the same protocol enum, that may introduce new > confusion, for example there will be some new CM handling for UDP encap, > source port selection, and of course vlan/tag assignment, etc. But if > there is support under way, and everyone is clear, then, ok.
RoCEv2/IBoUDP shares the same port space as UDP. It has a similar issues as iWarp does sharing state with the main network stack. I'm not aware of any proposal for resolving that. Does it require using a separate IP address? Does it use a port mapper function? Does netdev care for UDP? I'm not sure what USNIC does for this either, but a common solution between USNIC and IBoUDP seems reasonable.
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