[openib-general] Re: [PATCH] CMA: allow/require bind beforeconnect

[Tom Tucker]

BTW, I'm not saying they should _be_ the same port space (I think my
note could be interpreted to advocate that). I'm saying that the IB/CMA
port spaces should _behave_ the same way.

On Mon, 2006-03-27 at 13:42 -0600, Tom Tucker wrote:
> On Mon, 2006-03-27 at 11:03 -0800, Sean Hefty wrote:
> > >> It's correct that the CMA currently does not do this.  I
> > >> guess I'm still unsure of why it needs to when running over
> > >> IB.  The CMA should work fine if it assigned every active
> > >> connection the same port number.  As long as the CMA manages
> > >> its own port spaces, does it matter if its semantics are defined this
> > >> way?
> > >>
> > >The 4-tuple must be unique, even across devices. Hence if the
> > >native stack has X:Y to I:J then CMA cannot also create
> > >X:Y to I:J.
> > 
> > What I what to understand is _why_ it must be unique?  The CMA-IB port spaces
> > are separate from the native stack. 
> 
> But should they be? I mean it would be great if IPoIB address/port had
> the same semantics as Linux native TCP/IP address/port tuples.
> Especially if anyone ever dreamed of trying to bridge the IB/IP gap even
> more with devices for this purpose ;-) 
> 
> >  And the CMA-IB has no issues connecting or
> > routing data among multiple connections all having the same 4-tuple.
> 
> It 'works' to the extent that it has been tested thus far. I predict
> that this will wreak havoc with applications -- it already breaks NFS
> security policy.
> 
> > - Sean
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