[SCSI] add support for variable length extended commands
Add support for variable-length, extended, and vendor specific
CDBs to scsi-ml. It is now possible for initiators and ULD's
to issue these types of commands. LLDs need not change much.
All they need is to raise the .max_cmd_len to the longest command
they support (see iscsi patch).
- clean-up some code paths that did not expect commands to be
larger than 16, and change cmd_len members' type to short as
char is not enough.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d967d6d..1834fdf 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -573,13 +573,11 @@
/*
* The maximum length of SCSI commands that this host can accept.
* Probably 12 for most host adapters, but could be 16 for others.
+ * or 260 if the driver supports variable length cdbs.
* For drivers that don't set this field, a value of 12 is
- * assumed. I am leaving this as a number rather than a bit
- * because you never know what subsequent SCSI standards might do
- * (i.e. could there be a 20 byte or a 24-byte command a few years
- * down the road?).
+ * assumed.
*/
- unsigned char max_cmd_len;
+ unsigned short max_cmd_len;
int this_id;
int can_queue;