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author | FUJITA Tomonori <tomof@acm.org> | 2007-07-11 06:08:17 (GMT) |
---|---|---|
committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-10-12 18:37:50 (GMT) |
commit | 2c47f9efbedbe5749b6bb16e59bc11d6e460855f (patch) | |
tree | bfc1a2154f67c3aa45f92e586678ffc37e5f80eb /drivers | |
parent | aebd5e476ecc8ceb53577b20f2a352ff4ceffd8d (diff) | |
download | linux-fsl-qoriq-2c47f9efbedbe5749b6bb16e59bc11d6e460855f.tar.xz |
[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 'drivers')
-rw-r--r-- | drivers/scsi/scsi_tgt_if.c | 42 | ||||
-rw-r--r-- | drivers/scsi/scsi_tgt_lib.c | 83 | ||||
-rw-r--r-- | drivers/scsi/scsi_tgt_priv.h | 22 |
3 files changed, 122 insertions, 25 deletions
diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c index ca22ddf..9815a1a 100644 --- a/drivers/scsi/scsi_tgt_if.c +++ b/drivers/scsi/scsi_tgt_if.c @@ -102,7 +102,8 @@ static int tgt_uspace_send_event(u32 type, struct tgt_event *p) return 0; } -int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, struct scsi_lun *lun, u64 tag) +int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 itn_id, + struct scsi_lun *lun, u64 tag) { struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); struct tgt_event ev; @@ -110,6 +111,7 @@ int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, struct scsi_lun *lun, u64 ta memset(&ev, 0, sizeof(ev)); ev.p.cmd_req.host_no = shost->host_no; + ev.p.cmd_req.itn_id = itn_id; ev.p.cmd_req.data_len = cmd->request_bufflen; memcpy(ev.p.cmd_req.scb, cmd->cmnd, sizeof(ev.p.cmd_req.scb)); memcpy(ev.p.cmd_req.lun, lun, sizeof(ev.p.cmd_req.lun)); @@ -127,7 +129,7 @@ int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, struct scsi_lun *lun, u64 ta return err; } -int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 tag) +int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 itn_id, u64 tag) { struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); struct tgt_event ev; @@ -135,6 +137,7 @@ int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 tag) memset(&ev, 0, sizeof(ev)); ev.p.cmd_done.host_no = shost->host_no; + ev.p.cmd_done.itn_id = itn_id; ev.p.cmd_done.tag = tag; ev.p.cmd_done.result = cmd->result; @@ -149,14 +152,15 @@ int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 tag) return err; } -int scsi_tgt_uspace_send_tsk_mgmt(int host_no, int function, u64 tag, - struct scsi_lun *scsilun, void *data) +int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 itn_id, int function, + u64 tag, struct scsi_lun *scsilun, void *data) { struct tgt_event ev; int err; memset(&ev, 0, sizeof(ev)); ev.p.tsk_mgmt_req.host_no = host_no; + ev.p.tsk_mgmt_req.itn_id = itn_id; ev.p.tsk_mgmt_req.function = function; ev.p.tsk_mgmt_req.tag = tag; memcpy(ev.p.tsk_mgmt_req.lun, scsilun, sizeof(ev.p.tsk_mgmt_req.lun)); @@ -172,6 +176,29 @@ int scsi_tgt_uspace_send_tsk_mgmt(int host_no, int function, u64 tag, return err; } +int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 itn_id, + int function, char *initiator_id) +{ + struct tgt_event ev; + int err; + + memset(&ev, 0, sizeof(ev)); + ev.p.it_nexus_req.host_no = host_no; + ev.p.it_nexus_req.function = function; + ev.p.it_nexus_req.itn_id = itn_id; + if (initiator_id) + strncpy(ev.p.it_nexus_req.initiator_id, initiator_id, + sizeof(ev.p.it_nexus_req.initiator_id)); + + dprintk("%d %x %llx\n", host_no, function, (unsigned long long)itn_id); + + err = tgt_uspace_send_event(TGT_KEVENT_IT_NEXUS_REQ, &ev); + if (err) + eprintk("tx buf is full, could not send\n"); + + return err; +} + static int event_recv_msg(struct tgt_event *ev) { int err = 0; @@ -179,6 +206,7 @@ static int event_recv_msg(struct tgt_event *ev) switch (ev->hdr.type) { case TGT_UEVENT_CMD_RSP: err = scsi_tgt_kspace_exec(ev->p.cmd_rsp.host_no, + ev->p.cmd_rsp.itn_id, ev->p.cmd_rsp.result, ev->p.cmd_rsp.tag, ev->p.cmd_rsp.uaddr, @@ -189,9 +217,15 @@ static int event_recv_msg(struct tgt_event *ev) break; case TGT_UEVENT_TSK_MGMT_RSP: err = scsi_tgt_kspace_tsk_mgmt(ev->p.tsk_mgmt_rsp.host_no, + ev->p.tsk_mgmt_rsp.itn_id, ev->p.tsk_mgmt_rsp.mid, ev->p.tsk_mgmt_rsp.result); break; + case TGT_UEVENT_IT_NEXUS_RSP: + err = scsi_tgt_kspace_it_nexus_rsp(ev->p.it_nexus_rsp.host_no, + ev->p.it_nexus_rsp.itn_id, + ev->p.it_nexus_rsp.result); + break; default: eprintk("unknown type %d\n", ev->hdr.type); err = -EINVAL; diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c index 371b69c..fa79e54 100644 --- a/drivers/scsi/scsi_tgt_lib.c +++ b/drivers/scsi/scsi_tgt_lib.c @@ -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; diff --git a/drivers/scsi/scsi_tgt_priv.h b/drivers/scsi/scsi_tgt_priv.h index e9e6db1..cb92888 100644 --- a/drivers/scsi/scsi_tgt_priv.h +++ b/drivers/scsi/scsi_tgt_priv.h @@ -15,12 +15,18 @@ do { \ 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, struct scsi_lun *lun, - u64 tag); -extern int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 tag); -extern int scsi_tgt_kspace_exec(int host_no, 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, int function, u64 tag, +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 mid, int result); +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); |