1587b88eab
CCB at a time outstanding reliable. It's not there yet, but this is the direction to go in so might as well commit. So far, multiple at a time CCBs work (see ISP_INTERNAL_TARGET test mode), but it fails if there are more downstream than the SIM wants to handle and SRR is sort of confused when this happens, plus it is not entirely quite clear what one does if a CCB/CTIO fails and you have more in flight (that don't fail, say) and more queued up at the SIM level that haven't been started yet. Some of this is driven because there apparently is no flow control to requeue XPT_CONTINUE_IO requests like there are for XPT_SCSI_IO requests. It is also more driven in that the few target mode periph drivers there are are not really set up for handling pushback- heck most of them don't even check for errors (and what would they really do with them anyway? It's the initiator's problem, really....). The data transfer arithmetic has been worked over again to handle multiple outstanding commands, so you have a notion of what's been moved already as well as what's currently in flight. It turns that this led to uncovering a REPORT_LUNS bug in the ISP_INTERNAL_TARGET code which was sending back 24 bytes of rpl data instead of the specified 16. What happened furthermore here is that sending back 16 bytes and reporting an overrun of 8 bytes made the initiator (running FC-Tape aware f/w) mad enough to request, and keep requesting, another FCP response (I guess it didn't like the answer so kept asking for it again). Sponsored by: Spectralogic MFC after: 1 month
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