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authorBoaz Harrosh <bharrosh@panasas.com>2008-04-30 11:27:26 +0300
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-05-02 11:33:25 -0500
commitdb4742dd8f0aa9125b74f9b2516336a75f3d9106 (patch)
tree6820b74e8fbfb13c4eee4c8ef8b59a9132320799 /include/scsi/scsi_host.h
parent64a87b244b9297667ca80264aab849a36f494884 (diff)
downloadlinux-db4742dd8f0aa9125b74f9b2516336a75f3d9106.tar.bz2
[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>
Diffstat (limited to 'include/scsi/scsi_host.h')
-rw-r--r--include/scsi/scsi_host.h8
1 files changed, 3 insertions, 5 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index d967d6dc7a28..1834fdfe82a7 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -573,13 +573,11 @@ struct Scsi_Host {
/*
* 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;