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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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83
drivers/scsi/scsi_tgt_lib.c
View File

@@ -27,6 +27,7 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_tgt.h>
#include "scsi_tgt_priv.h"
@@ -46,6 +47,7 @@ struct scsi_tgt_cmd {
struct list_head hash_list;
struct request *rq;
u64 itn_id;
u64 tag;
};
@@ -185,12 +187,13 @@ static void scsi_tgt_cmd_destroy(struct work_struct *work)
}
static void init_scsi_tgt_cmd(struct request *rq, struct scsi_tgt_cmd *tcmd,
u64 tag)
u64 itn_id, u64 tag)
{
struct scsi_tgt_queuedata *qdata = rq->q->queuedata;
unsigned long flags;
struct list_head *head;
tcmd->itn_id = itn_id;
tcmd->tag = tag;
tcmd->bio = NULL;
INIT_WORK(&tcmd->work, scsi_tgt_cmd_destroy);
@@ -301,14 +304,14 @@ EXPORT_SYMBOL_GPL(scsi_tgt_cmd_to_host);
* @scsilun: scsi lun
* @tag: unique value to identify this command for tmf
*/
int scsi_tgt_queue_command(struct scsi_cmnd *cmd, struct scsi_lun *scsilun,
u64 tag)
int scsi_tgt_queue_command(struct scsi_cmnd *cmd, u64 itn_id,
struct scsi_lun *scsilun, u64 tag)
{
struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data;
int err;
init_scsi_tgt_cmd(cmd->request, tcmd, tag);
err = scsi_tgt_uspace_send_cmd(cmd, scsilun, tag);
init_scsi_tgt_cmd(cmd->request, tcmd, itn_id, tag);
err = scsi_tgt_uspace_send_cmd(cmd, itn_id, scsilun, tag);
if (err)
cmd_hashlist_del(cmd);
@@ -326,7 +329,7 @@ static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd)
dprintk("cmd %p %lu\n", cmd, rq_data_dir(cmd->request));
scsi_tgt_uspace_send_status(cmd, tcmd->tag);
scsi_tgt_uspace_send_status(cmd, tcmd->itn_id, tcmd->tag);
if (cmd->request_buffer)
scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len);
@@ -459,7 +462,7 @@ static struct request *tgt_cmd_hash_lookup(struct request_queue *q, u64 tag)
return rq;
}
int scsi_tgt_kspace_exec(int host_no, int result, u64 tag,
int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag,
unsigned long uaddr, u32 len, unsigned long sense_uaddr,
u32 sense_len, u8 rw)
{
@@ -541,21 +544,22 @@ done:
return err;
}
int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, int function, u64 tag,
struct scsi_lun *scsilun, void *data)
int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, u64 itn_id,
int function, u64 tag, struct scsi_lun *scsilun,
void *data)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, function,
tag, scsilun, data);
err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, itn_id,
function, tag, scsilun, data);
if (err < 0)
eprintk("The task management request lost!\n");
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_tsk_mgmt_request);
int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 mid, int result)
int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 itn_id, u64 mid, int result)
{
struct Scsi_Host *shost;
int err = -EINVAL;
@@ -573,7 +577,60 @@ int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 mid, int result)
goto done;
}
err = shost->hostt->tsk_mgmt_response(mid, result);
err = shost->hostt->tsk_mgmt_response(shost, itn_id, mid, result);
done:
scsi_host_put(shost);
return err;
}
int scsi_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, itn_id, 0,
initiator);
if (err < 0)
eprintk("The i_t_neuxs request lost, %d %llx!\n",
shost->host_no, (unsigned long long)itn_id);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_create);
int scsi_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no,
itn_id, 1, NULL);
if (err < 0)
eprintk("The i_t_neuxs request lost, %d %llx!\n",
shost->host_no, (unsigned long long)itn_id);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_destroy);
int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 itn_id, int result)
{
struct Scsi_Host *shost;
int err = -EINVAL;
dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid);
shost = scsi_host_lookup(host_no);
if (IS_ERR(shost)) {
printk(KERN_ERR "Could not find host no %d\n", host_no);
return err;
}
if (!shost->uspace_req_q) {
printk(KERN_ERR "Not target scsi host %d\n", host_no);
goto done;
}
err = shost->transportt->it_nexus_response(shost, itn_id, result);
done:
scsi_host_put(shost);
return err;