linux-stable/include/scsi/scsi_tgt.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

21 lines
807 B
C

/*
* SCSI target definitions
*/
#include <linux/dma-mapping.h>
struct Scsi_Host;
struct scsi_cmnd;
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 *, 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);