[openib-general] Re: [PATCH] [SRP] support for it_iu length negotiation

[Roland Dreier]

    John> I have no problem with changing the 1K IU to some other
    John> value.  I would rather see this max IU size as a module
    John> parameter, however, so that it may be changed without having
    John> to rebuild the module.

I guess that's OK for development but I'm not convinced we need to
make this tunable for general end users.

    John> If you agree that it_iu size negotiation is OK, then the
    John> case where you connect to a target with a smaller it_iu size
    John> than ib_srp was built with leaves some number of indirect
    John> descriptors in the position of only being available to the
    John> target via RDMA.  This would probably be considered a win
    John> compared to not talking to the target at all.  :-)

I'm missing something here.  The SRP initiator registers itself with
the SCSI midlayer after it has successfully connected to the target
port, so I don't see why it can't pass exactly the right sg_tablesize
value to the SCSI midlayer.

 - R.