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linux-next/drivers/scsi/scsi_tgt_priv.h
FUJITA Tomonori 2c47f9efbe [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>
2007-10-12 14:37:50 -04:00

33 lines
1.2 KiB
C

struct scsi_cmnd;
struct scsi_lun;
struct Scsi_Host;
struct task_struct;
/* tmp - will replace with SCSI logging stuff */
#define eprintk(fmt, args...) \
do { \
printk("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
} while (0)
#define dprintk(fmt, args...)
/* #define dprintk eprintk */
extern void scsi_tgt_if_exit(void);
extern int scsi_tgt_if_init(void);
extern int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 it_nexus_id,
struct scsi_lun *lun, u64 tag);
extern int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 it_nexus_id,
u64 tag);
extern int scsi_tgt_kspace_exec(int host_no, u64 it_nexus_id, int result, u64 tag,
unsigned long uaddr, u32 len,
unsigned long sense_uaddr, u32 sense_len, u8 rw);
extern int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 it_nexus_id,
int function, u64 tag,
struct scsi_lun *scsilun, void *data);
extern int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 it_nexus_id,
u64 mid, int result);
extern int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 it_nexus_id,
int function, char *initiator);
extern int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 it_nexus_id, int result);