On Wed, Feb 22, 2023 at 04:37:51PM +0200, Sagi Grimberg wrote: > > > > I did not understand what is the relationship between aborts and CDL. > > > Sounds to me that this would tie in to something like Time Limited Error > > > Recovery (TLER) and LR bit set based on ioprio? > > > > > > I am unclear where do aborts come into play here. > > > > CDL: Command Duration Limits > > > > One use case is reading from storage for audio visual output. > > An application only wants to wait so long (e.g. one or two frames > > on the video output) before it wants to forget about the current > > read (i.e. "abort" it) and move onto the next read. An alert viewer > > might notice a momentary freeze frame. > > > > The SCSI CDL mechanism uses the DL0, DL1 and DL2 bits in the READ(16,32) > > commands. CDL also depends on the CDLP and RWCDLP fields in the > > REPORT SUPPORTED OPERATION CODES command and one of the CDL > > mode pages. So there may be some additional "wiring" needed in the > > SCSI subsystem. > > I still don't understand where issuing aborts from userspace come into > play here... The only connection is that aborts are obsolete and unnecessary if you have a working CDL implementation.
