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[SCSI] tgt: add I_T nexus support

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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>
This commit is contained in:
FUJITA Tomonori
2007-07-11 15:08:17 +09:00
committed by James Bottomley
parent aebd5e476e
commit 2c47f9efbe
7 changed files with 161 additions and 37 deletions
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2
include/scsi/scsi_host.h
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@@ -146,7 +146,7 @@ struct scsi_host_template {
void (*done)(struct scsi_cmnd *));
/* Used as callback for the completion of task management request. */
int (* tsk_mgmt_response)(u64 mid, int result);
int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64 mid, int result);
/*
* This is an error handling strategy routine. You don't need to

8
include/scsi/scsi_tgt.h
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@@ -11,9 +11,11 @@ struct scsi_lun;
extern struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *);
extern int scsi_tgt_alloc_queue(struct Scsi_Host *);
extern void scsi_tgt_free_queue(struct Scsi_Host *);
extern int scsi_tgt_queue_command(struct scsi_cmnd *, struct scsi_lun *, u64);
extern int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *, int, u64, struct scsi_lun *,
void *);
extern int scsi_tgt_queue_command(struct scsi_cmnd *, u64, struct scsi_lun *, u64);
extern int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *, u64, int, u64,
struct scsi_lun *, void *);
extern struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *,
enum dma_data_direction, gfp_t);
extern void scsi_host_put_command(struct Scsi_Host *, struct scsi_cmnd *);
extern int scsi_tgt_it_nexus_create(struct Scsi_Host *, u64, char *);
extern int scsi_tgt_it_nexus_destroy(struct Scsi_Host *, u64);

35
include/scsi/scsi_tgt_if.h
View File

@@ -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))));

6
include/scsi/scsi_transport.h
View File

@@ -65,6 +65,12 @@ struct scsi_transport_template {
* EH_NOT_HANDLED Begin normal error recovery
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
/*
* Used as callback for the completion of i_t_nexus request
* for target drivers.
*/
int (* it_nexus_response)(struct Scsi_Host *, u64, int);
};
#define transport_class_to_shost(tc) \