On Tue, Apr 15 2008 at 16:08 +0300, James Smart <James.Smart@xxxxxxxxxx> wrote: > Boaz Harrosh wrote: >> Let through up to the largest command of 260 defined by the scsi standard. >> iscsi core supports this already. Now that the scsi-ml supports it we can >> start using large commands. > > Just to double-check: > if we use sg_io to pass through requests from user-land, which are addressed to > drivers or transports, and which may not be a SCSI command but rather just something > utilizing the sg_io infrastructure for management or pass-thru, are we limited to > 260 bytes for request/cmd payload ? > > -- james s I think that only bsg, after the pending patches get accepted, will let you pass larger then 16 bytes commands from user-land. sg_io is I think limited to 16. However this could be fixed. (With sg_io, did you mean commands going through the sg.c driver?) The block layer imposes no limits, and so is scsi-ml. The only limits are from ULDs, and LLDs, like here, iscsi protocol does not support more then SCSI_MAX_VARLEN_CDB_SIZE (260). If you need support in any other ULD, I will be happy to help. 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
