Re: [PATCH v4 1/9] IB/cma: pass the port number to ib_create_qp

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On Tue, Mar 08, 2016 at 09:55:14PM +0200, Leon Romanovsky wrote:
> > At the expense of replicating this code and forcing all users to remember to set this.
> 
> There are no much such users to update, these users need to set
> qp_init_attr structure anyway.

But they need to extract the port_num first, while we already get
the cm_id that has the right port_id passed to this function.  Not
setting it in the qp_init_attr changes the interface from one that
just works to one that is arcane, and prone to generate hard to
detect errors (passing a 0 port_num will just work for all current
drivers, but if someone at some point actually introduces different
capabilities for differnet ports it will break for just that case!)
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