> > This patch adds out of order packet handling for hardware offloaded > > iSCSI. Out of order packet handling requires driver buffer allocation > > and assistance. > > > > Signed-off-by: Arun Easi <arun.easi@xxxxxxxxxx> > > Signed-off-by: Yuval Mintz <yuval.mintz@xxxxxxxxxx> > > > Hmm. The entire out-of-order handling is pretty generic. I really wonder > if this doesn't apply to iSCSI in general; surely iscsi_tcp suffers from > the same problem, no? > If so, wouldn't it be better to move it into generic (iSCSI) code so > that all implementations would benefit from it? [disclaimer - I'm far from knowledgeable in iscsi ] I agree that the problem of out-of-order handling is probably generic, but our solution is very device oriented. As the device lacks [a lot of] internal memory, it uses the host memory for out-of-order buffers and the driver assistance in pushing them when they are needed. >From driver perspective, all the data is completely opaque; All it does is follow the firmware's guidance in storing & re-transmitting buffers when required. Now, I guess the logic could be divided between hardware-specifics - Interaction with 'client' [in our case, device's firmware], to receive new data, instructions regarding placement and re-transmission, and a lower generic data structure which supports manipulation of buffers [push-left, push-right, join, etc.]. But given that the data-structure would completely lacks all protocol-knowledge [as our implementation doesn't have nor require such], I think there would be very little gain - we might find out that as much as 80% of the code is device interaction, and the remaining so-called 'generic' data-structure won't be that useful to other clients as it was closely tied to our device needs and API. Either way, placing this under iscsi would probably be insufficient for our future needs, as our qed-iwarp driver would also require this functionality. Thanks, Yuval -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
