IB/srp: Add 64-bit LUN support

The SCSI standard defines 64-bit values for LUNs. Large arrays
employing large or hierarchical LUN numbers become more and more
common. So update the SRP initiator to use 64-bit LUN numbers.
See also Hannes Reinecke, commit 9cb78c16f5da ("scsi: use 64-bit LUNs"),
June 2014.

The largest LUN number that has been tested is 0xd2003fff00000000.

Checked the following structure sizes with gdb:
* sizeof(struct srp_cmd) = 48
* sizeof(struct srp_tsk_mgmt) = 48
* sizeof(struct srp_aer_req) = 36

The ibmvscsi changes have been compile tested only (on a PPC system).

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Yann Droneaud <ydroneaud@opteya.com>
Cc: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Cc: Brian King <brking@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/include/scsi/srp.h b/include/scsi/srp.h
index 1ae84db4c9fb..5be834de491a 100644
--- a/include/scsi/srp.h
+++ b/include/scsi/srp.h
@@ -42,6 +42,7 @@
  */
 
 #include <linux/types.h>
+#include <scsi/scsi.h>
 
 enum {
         SRP_LOGIN_REQ   = 0x00,
@@ -179,7 +180,7 @@ struct srp_tsk_mgmt {
         u8      reserved1[6];
         u64     tag;
         u8      reserved2[4];
-        __be64  lun __attribute__((packed));
+        struct scsi_lun lun;
         u8      reserved3[2];
         u8      tsk_mgmt_func;
         u8      reserved4;
@@ -200,7 +201,7 @@ struct srp_cmd {
         u8      data_in_desc_cnt;
         u64     tag;
         u8      reserved2[4];
-        __be64  lun __attribute__((packed));
+        struct scsi_lun lun;
         u8      reserved3;
         u8      task_attr;
         u8      reserved4;
@@ -265,7 +266,7 @@ struct srp_aer_req {
         __be32  req_lim_delta;
         u64     tag;
         u32     reserved2;
-        __be64  lun;
+        struct scsi_lun lun;
         __be32  sense_data_len;
         u32     reserved3;
         u8      sense_data[0];