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authorFUJITA Tomonori <tomof@acm.org>2007-07-11 08:08:17 +0200
committerJames Bottomley <jejb@mulgrave.localdomain>2007-10-12 20:37:50 +0200
commit2c47f9efbedbe5749b6bb16e59bc11d6e460855f (patch)
treebfc1a2154f67c3aa45f92e586678ffc37e5f80eb /include/scsi/scsi_tgt_if.h
parent[SCSI] transport_srp: add rport roles attribute (diff)
downloadlinux-2c47f9efbedbe5749b6bb16e59bc11d6e460855f.tar.xz
linux-2c47f9efbedbe5749b6bb16e59bc11d6e460855f.zip
[SCSI] tgt: add I_T nexus support
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it creates one scsi_host for one initiator. However, other target drivers don't work like that. This adds I_T nexus support, which enable one scsi_host to handle multiple initiators. New scsi_tgt_it_nexus_create/destroy functions are expected be called transport classes. For example, ibmvstgt creates an initiator remote port, then the srp transport calls tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells tgtd, user-space daemon, to create a new I_T nexus. On the receiving the response from tgtd, tgt calls shost->transportt->it_nexus_response. transports should notify a lld. The srp transport uses it_nexus_response callback in srp_function_template to do that. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_tgt_if.h')
-rw-r--r--include/scsi/scsi_tgt_if.h35
1 files changed, 27 insertions, 8 deletions
diff --git a/include/scsi/scsi_tgt_if.h b/include/scsi/scsi_tgt_if.h
index 4cf9dff29a2f..f2ee7c238a45 100644
--- a/include/scsi/scsi_tgt_if.h
+++ b/include/scsi/scsi_tgt_if.h
@@ -23,13 +23,15 @@
#define __SCSI_TARGET_IF_H
/* user -> kernel */
-#define TGT_UEVENT_CMD_RSP 0x0001
-#define TGT_UEVENT_TSK_MGMT_RSP 0x0002
+#define TGT_UEVENT_CMD_RSP 0x0001
+#define TGT_UEVENT_IT_NEXUS_RSP 0x0002
+#define TGT_UEVENT_TSK_MGMT_RSP 0x0003
/* kernel -> user */
-#define TGT_KEVENT_CMD_REQ 0x1001
-#define TGT_KEVENT_CMD_DONE 0x1002
-#define TGT_KEVENT_TSK_MGMT_REQ 0x1003
+#define TGT_KEVENT_CMD_REQ 0x1001
+#define TGT_KEVENT_CMD_DONE 0x1002
+#define TGT_KEVENT_IT_NEXUS_REQ 0x1003
+#define TGT_KEVENT_TSK_MGMT_REQ 0x1004
struct tgt_event_hdr {
uint16_t version;
@@ -46,6 +48,7 @@ struct tgt_event {
struct {
int host_no;
int result;
+ aligned_u64 itn_id;
aligned_u64 tag;
aligned_u64 uaddr;
aligned_u64 sense_uaddr;
@@ -55,15 +58,22 @@ struct tgt_event {
} cmd_rsp;
struct {
int host_no;
- aligned_u64 mid;
int result;
+ aligned_u64 itn_id;
+ aligned_u64 mid;
} tsk_mgmt_rsp;
-
+ struct {
+ __s32 host_no;
+ __s32 result;
+ aligned_u64 itn_id;
+ __u32 function;
+ } it_nexus_rsp;
/* kernel -> user */
struct {
int host_no;
uint32_t data_len;
+ aligned_u64 itn_id;
uint8_t scb[16];
uint8_t lun[8];
int attribute;
@@ -71,16 +81,25 @@ struct tgt_event {
} cmd_req;
struct {
int host_no;
- aligned_u64 tag;
int result;
+ aligned_u64 itn_id;
+ aligned_u64 tag;
} cmd_done;
struct {
int host_no;
int function;
+ aligned_u64 itn_id;
aligned_u64 tag;
uint8_t lun[8];
aligned_u64 mid;
} tsk_mgmt_req;
+ struct {
+ __s32 host_no;
+ __u32 function;
+ aligned_u64 itn_id;
+ __u32 max_cmds;
+ __u8 initiator_id[16];
+ } it_nexus_req;
} p;
} __attribute__ ((aligned (sizeof(uint64_t))));