From: Roland Dreier <rdreier@xxxxxxxxx>Is there any chance your could discuss exactly how a stateless adapter can determine if a network segment
Date: Wed, 13 Aug 2008 16:03:15 -0700
OK, I admit you could make something work -- add hooks for the low-level
driver to ask the iSCSI initiator where PDU boundaries are so it can
resync when something is evicted from the flow cache, have the initiator
format its tags in a special way to encode placement data, etc, etc.
The scheme does bring to mind Alan's earlier comment about pigs and
propulsion, though.
There would need to be _NO_ hooks into the iSCSI initiator at all.
The card would land the block I/O data onto the necessary page boundaries
and the iSCSI code would just be able to thus use the pages directly
and as-is.
It would look perfectly like normal TCP receive traffic. No hooks,
no special cases, nothing like that.
In any case, as I said in the part of my email that you snipped, the
real issue is not designing hypothetical hardware, but deciding how to
support the Chelsio, Broadcom, etc hardware that exists today.
The same like we support TOE hardware that exists today. That is, we
don't.
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