On 06/25/2014 04:17 AM, Vladislav Bolkhovitin wrote: > Martin K. Petersen, on 06/23/2014 06:58 PM wrote: >>>>>>> "Mike" == Mike Christie <michaelc@xxxxxxxxxxx> writes: >>>> + unsigned int xfer_len = blk_rq_bytes(scmd->request); >> >> Mike> Can you do bidi and dif/dix? >> >> Nope. > > Correction: at the moment. > > There is a proposal of READ GATHERED command, which is bidirectional and potentially > DIF/DIX. > That's all very good. But current infrastructure can not support BIDI+DIFF. Because you we'll need *two* diff vectors one for each side. Now in fact at the block layer this is actually supported. Since BIDI is two requests, and each can have its own DIFF bio. But on the scsi layer this is not implemented. So I'd say: *For now DIFF and BIDI are mutually exclusive.* (You'll need someone to love these new commands a lot in order to enable it) > Vlad > Cheers Boaz -- 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
