[openib-general] Reserved L_Key API
Michael S. Tsirkin
mst at mellanox.co.il
Sun Sep 19 12:18:28 PDT 2004
Quoting r. Grant Grundler (iod00d at hp.com) "Re: [openib-general] Reserved L_Key API":
> On Wed, Sep 15, 2004 at 08:42:53AM -0700, Roland Dreier wrote:
> > Fabian> Are the ramifications of such an RKEY any worse than those
> > Fabian> of locally attached DMA-capable adapters?
> Not if one can guarantee it's well behaved.
> > Fabian> If your FC HBA
> > Fabian> goes haywire and decides to write all over memory, there's
> > Fabian> not much you can do.
> That's not true. There are platforms that can isolate the FC and
> prevent the FC HBA from scribbling to anything the respective driver
> didn't previously get explicite write permission. ie we can guarantee
> the containment.
In such platforms, my understanding is you dont really need the rkey protection
in the HCA - the dma API will do this for you.
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