From 2c47f9efbedbe5749b6bb16e59bc11d6e460855f Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Wed, 11 Jul 2007 15:08:17 +0900 Subject: [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 Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/scsi_tgt_if.c | 42 ++++++++++++++++++++++++++++++++++++++---- 1 file changed, 38 insertions(+), 4 deletions(-) (limited to 'drivers/scsi/scsi_tgt_if.c') diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c index ca22ddf81746..9815a1a2db24 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; -- cgit v1.2.3