[ewg] RE: [ofa-general] RFCv2: SRC API

[Tang, Changqing]

 Maybe I miss something here.

Only of the job among j2, j3, j4 on remote node n need to create a
receiving qp2 for j1, right ?

--CQ


> -----Original Message-----
> From: general-bounces at lists.openfabrics.org 
> [mailto:general-bounces at lists.openfabrics.org] On Behalf Of 
> Tang, Changqing
> Sent: Monday, August 06, 2007 10:31 AM
> To: Michael S. Tsirkin
> Cc: Pavel Shamis; Gil Bloch; ewg at lists.openfabrics.org; 
> general at lists.openfabrics.org; Ishai Rabinovitz
> Subject: RE: [ofa-general] RFCv2: SRC API
> 
>  
> > +When job j1 needs to transmit to job j2 on remote node n for
> > the first time:
> > +1. Test: does job j1 have an existing connection to some job
> > on node n?
> > +        - If no:
> > +		j1 creates an SRC QP qp1 (send QP)
> > +			qp1 is only used to post send WRs
> > +		j2 creates an SRC QP qp2
> > +			qp2 is part of SRC domain
> > +			qp2 is only used to do transport checks:
> > +				neither send nor receive WRs
> > are posted on qp2
> > +		j1 and j2 create a connection between qp1 and qp2
> > +	- If yes:
> > +		let qp1 be the QP which belongs to j1 and is connected
> > +			to some qp on node n
> > +
> > +2. j1 gets SRQ number from j2
> > +3. j1 can now use QP qp2 from step 1
> > +   and SRQ number from step 3 to send data to j2
> > +
> > +Cleanup:
> > +When job j1 does not need to communicate to any jobs on node n, it 
> > +disconnects qp1 from qp2, and asks j2 to destroy qp2.
> 
> Suppose remote node n has j2/qp2, j3/qp3, j4/qp4, qp1 on j1 
> is connected to qp2, then there is no need to make connection 
> between qp1 and qp3,
> qp1 and qp4, there are automatically connected, right ?  Then 
> how can j3 know that j2 has connected to j1, it does not need 
> to make connection again ?
> 
> qp1 find destination by SRQ number only, so "+3. j1 can now 
> use QP qp2 from step 1", what does it mean ?
> 
> Can we destroy qp2 on j2 first, and keep j1 and j3 continue 
> to communicate ?
> 
> --CQ
> 
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