diff options
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_hbadisc.c | 28 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_init.c | 19 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_scsi.c | 83 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_def.h | 3 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_init.c | 26 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_os.c | 21 | ||||
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_rscn.c | 3 | ||||
| -rw-r--r-- | drivers/scsi/scsi_transport_fc.c | 446 | ||||
| -rw-r--r-- | include/scsi/scsi_transport_fc.h | 31 |
9 files changed, 384 insertions, 276 deletions
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 56052f4510c..6c846ad373b 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -1028,6 +1028,7 @@ lpfc_register_remote_port(struct lpfc_hba * phba, if (ndlp->nlp_type & NLP_FCP_INITIATOR) rport_ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR; + scsi_block_requests(phba->host); ndlp->rport = rport = fc_remote_port_add(phba->host, 0, &rport_ids); if (!rport) { dev_printk(KERN_WARNING, &phba->pcidev->dev, @@ -1044,6 +1045,23 @@ lpfc_register_remote_port(struct lpfc_hba * phba, } rdata = rport->dd_data; rdata->pnode = ndlp; + scsi_unblock_requests(phba->host); + + return; +} + +static void +lpfc_unregister_remote_port(struct lpfc_hba * phba, + struct lpfc_nodelist * ndlp) +{ + struct fc_rport *rport = ndlp->rport; + struct lpfc_rport_data *rdata = rport->dd_data; + + ndlp->rport = NULL; + rdata->pnode = NULL; + scsi_block_requests(phba->host); + fc_remote_port_delete(rport); + scsi_unblock_requests(phba->host); return; } @@ -1260,7 +1278,7 @@ lpfc_nlp_list(struct lpfc_hba * phba, struct lpfc_nodelist * nlp, int list) * may have removed the remote port. */ if ((rport_del != none) && nlp->rport) - fc_remote_port_block(nlp->rport); + lpfc_unregister_remote_port(phba, nlp); if (rport_add != none) { /* @@ -1270,8 +1288,6 @@ lpfc_nlp_list(struct lpfc_hba * phba, struct lpfc_nodelist * nlp, int list) */ if (!nlp->rport) lpfc_register_remote_port(phba, nlp); - else - fc_remote_port_unblock(nlp->rport); /* * if we added to Mapped list, but the remote port @@ -1490,7 +1506,6 @@ lpfc_freenode(struct lpfc_hba * phba, struct lpfc_nodelist * ndlp) LPFC_MBOXQ_t *mb; LPFC_MBOXQ_t *nextmb; struct lpfc_dmabuf *mp; - struct fc_rport *rport; /* Cleanup node for NPort <nlp_DID> */ lpfc_printf_log(phba, KERN_INFO, LOG_NODE, @@ -1507,10 +1522,7 @@ lpfc_freenode(struct lpfc_hba * phba, struct lpfc_nodelist * ndlp) * and flush cache's w/o generating flush errors. */ if ((ndlp->rport) && !(phba->fc_flag & FC_UNLOADING)) { - rport = ndlp->rport; - ndlp->rport = NULL; - fc_remote_port_unblock(rport); - fc_remote_port_delete(rport); + lpfc_unregister_remote_port(phba, ndlp); ndlp->nlp_sid = NLP_NO_SID; } diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 0856ff7d3b3..25d55f40424 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -537,12 +537,6 @@ lpfc_handle_eratt(struct lpfc_hba * phba) lpfc_offline(phba); - /* - * Restart all traffic to this host. Since the fc_transport - * block functions (future) were not called in lpfc_offline, - * don't call them here. - */ - scsi_unblock_requests(phba->host); } } @@ -1226,12 +1220,6 @@ lpfc_online(struct lpfc_hba * phba) phba->fc_flag &= ~FC_OFFLINE_MODE; spin_unlock_irq(phba->host->host_lock); - /* - * Restart all traffic to this host. Since the fc_transport block - * functions (future) were not called in lpfc_offline, don't call them - * here. - */ - scsi_unblock_requests(phba->host); return 0; } @@ -1249,13 +1237,6 @@ lpfc_offline(struct lpfc_hba * phba) if (phba->fc_flag & FC_OFFLINE_MODE) return 0; - /* - * Don't call the fc_transport block api (future). The device is - * going offline and causing a timer to fire in the midlayer is - * unproductive. Just block all new requests until the driver - * comes back online. - */ - scsi_block_requests(phba->host); psli = &phba->sli; pring = &psli->ring[psli->fcp_ring]; diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index b5ad1871d34..c55ab1a630e 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -403,14 +403,9 @@ lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn, break; } - if (pnode) { - if (pnode->nlp_state != NLP_STE_MAPPED_NODE) - cmd->result = ScsiResult(DID_BUS_BUSY, - SAM_STAT_BUSY); - } - else { - cmd->result = ScsiResult(DID_NO_CONNECT, 0); - } + if ((pnode == NULL ) + || (pnode->nlp_state != NLP_STE_MAPPED_NODE)) + cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY); } else { cmd->result = ScsiResult(DID_OK, 0); } @@ -539,7 +534,7 @@ lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_hba *phba, struct lpfc_rport_data *rdata = scsi_dev->hostdata; struct lpfc_nodelist *ndlp = rdata->pnode; - if ((ndlp == 0) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) { + if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) { return 0; } @@ -727,39 +722,23 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *)) struct lpfc_rport_data *rdata = cmnd->device->hostdata; struct lpfc_nodelist *ndlp = rdata->pnode; struct lpfc_scsi_buf *lpfc_cmd = NULL; + struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list; - int err = 0; + int err; - /* - * The target pointer is guaranteed not to be NULL because the driver - * only clears the device->hostdata field in lpfc_slave_destroy. This - * approach guarantees no further IO calls on this target. - */ - if (!ndlp) { - cmnd->result = ScsiResult(DID_NO_CONNECT, 0); + err = fc_remote_port_chkready(rport); + if (err) { + cmnd->result = err; goto out_fail_command; } /* - * A Fibre Channel target is present and functioning only when the node - * state is MAPPED. Any other state is a failure. + * Catch race where our node has transitioned, but the + * transport is still transitioning. */ - if (ndlp->nlp_state != NLP_STE_MAPPED_NODE) { - if ((ndlp->nlp_state == NLP_STE_UNMAPPED_NODE) || - (ndlp->nlp_state == NLP_STE_UNUSED_NODE)) { - cmnd->result = ScsiResult(DID_NO_CONNECT, 0); - goto out_fail_command; - } - else if (ndlp->nlp_state == NLP_STE_NPR_NODE) { - cmnd->result = ScsiResult(DID_BUS_BUSY, 0); - goto out_fail_command; - } - /* - * The device is most likely recovered and the driver - * needs a bit more time to finish. Ask the midlayer - * to retry. - */ - goto out_host_busy; + if (!ndlp) { + cmnd->result = ScsiResult(DID_BUS_BUSY, 0); + goto out_fail_command; } list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list); @@ -1163,44 +1142,16 @@ static int lpfc_slave_alloc(struct scsi_device *sdev) { struct lpfc_hba *phba = (struct lpfc_hba *)sdev->host->hostdata[0]; - struct lpfc_nodelist *ndlp = NULL; - int match = 0; struct lpfc_scsi_buf *scsi_buf = NULL; + struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); uint32_t total = 0, i; uint32_t num_to_alloc = 0; unsigned long flags; - struct list_head *listp; - struct list_head *node_list[6]; - - /* - * Store the target pointer in the scsi_device hostdata pointer provided - * the driver has already discovered the target id. - */ - - /* Search the nlp lists other than unmap_list for this target ID */ - node_list[0] = &phba->fc_npr_list; - node_list[1] = &phba->fc_nlpmap_list; - node_list[2] = &phba->fc_prli_list; - node_list[3] = &phba->fc_reglogin_list; - node_list[4] = &phba->fc_adisc_list; - node_list[5] = &phba->fc_plogi_list; - - for (i = 0; i < 6 && !match; i++) { - listp = node_list[i]; - if (list_empty(listp)) - continue; - list_for_each_entry(ndlp, listp, nlp_listp) { - if ((sdev->id == ndlp->nlp_sid) && ndlp->rport) { - match = 1; - break; - } - } - } - if (!match) + if (!rport || fc_remote_port_chkready(rport)) return -ENXIO; - sdev->hostdata = ndlp->rport->dd_data; + sdev->hostdata = rport->dd_data; /* * Populate the cmds_per_lun count scsi_bufs into this host's globally diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h index fc3234c3625..7096945ea23 100644 --- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -21,6 +21,7 @@ #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/interrupt.h> +#include <linux/workqueue.h> #include <asm/semaphore.h> #include <scsi/scsi.h> @@ -1665,6 +1666,8 @@ typedef struct fc_port { struct fc_rport *rport; u32 supported_classes; + struct work_struct rport_add_work; + struct work_struct rport_del_work; } fc_port_t; /* diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c index ce7e712ebe8..290a6b92616 100644 --- a/drivers/scsi/qla2xxx/qla_init.c +++ b/drivers/scsi/qla2xxx/qla_init.c @@ -1668,6 +1668,24 @@ qla2x00_nvram_config(scsi_qla_host_t *ha) return (rval); } +static void +qla2x00_rport_add(void *data) +{ + fc_port_t *fcport = data; + + qla2x00_reg_remote_port(fcport->ha, fcport); +} + +static void +qla2x00_rport_del(void *data) +{ + fc_port_t *fcport = data; + + if (fcport->rport) + fc_remote_port_delete(fcport->rport); + fcport->rport = NULL; +} + /** * qla2x00_alloc_fcport() - Allocate a generic fcport. * @ha: HA context @@ -1693,6 +1711,8 @@ qla2x00_alloc_fcport(scsi_qla_host_t *ha, gfp_t flags) atomic_set(&fcport->state, FCS_UNCONFIGURED); fcport->flags = FCF_RLC_SUPPORT; fcport->supported_classes = FC_COS_UNSPECIFIED; + INIT_WORK(&fcport->rport_add_work, qla2x00_rport_add, fcport); + INIT_WORK(&fcport->rport_del_work, qla2x00_rport_del, fcport); return (fcport); } @@ -2056,8 +2076,8 @@ qla2x00_reg_remote_port(scsi_qla_host_t *ha, fc_port_t *fcport) struct fc_rport *rport; if (fcport->rport) { - fc_remote_port_unblock(fcport->rport); - return; + fc_remote_port_delete(fcport->rport); + fcport->rport = NULL; } rport_ids.node_name = wwn_to_u64(fcport->node_name); @@ -2071,7 +2091,7 @@ qla2x00_reg_remote_port(scsi_qla_host_t *ha, fc_port_t *fcport) "Unable to allocate fc remote port!\n"); return; } - rport->dd_data = fcport; + *((fc_port_t **)rport->dd_data) = fcport; rport->supported_classes = fcport->supported_classes; rport_ids.roles = FC_RPORT_ROLE_UNKNOWN; diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index b899282a856..c58c9d97b04 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -348,11 +348,13 @@ qla2x00_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) { scsi_qla_host_t *ha = to_qla_host(cmd->device->host); fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata; + struct fc_rport *rport = starget_to_rport(scsi_target(cmd->device)); srb_t *sp; int rval; - if (!fcport) { - cmd->result = DID_NO_CONNECT << 16; + rval = fc_remote_port_chkready(rport); + if (rval) { + cmd->result = rval; goto qc_fail_command; } @@ -401,11 +403,13 @@ qla24xx_queuecommand(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) { scsi_qla_host_t *ha = to_qla_host(cmd->device->host); fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata; + struct fc_rport *rport = starget_to_rport(scsi_target(cmd->device)); srb_t *sp; int rval; - if (!fcport) { - cmd->result = DID_NO_CONNECT << 16; + rval = fc_remote_port_chkready(rport); + if (rval) { + cmd->result = rval; goto qc24_fail_command; } @@ -1041,10 +1045,10 @@ qla2xxx_slave_alloc(struct scsi_device *sdev) { struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); - if (!rport) + if (!rport || fc_remote_port_chkready(rport)) return -ENXIO; - sdev->hostdata = rport->dd_data; + sdev->hostdata = *(fc_port_t **)rport->dd_data; return 0; } @@ -1636,7 +1640,8 @@ void qla2x00_mark_device_lost(scsi_qla_host_t *ha, fc_port_t *fcport, int do_login) { if (atomic_read(&fcport->state) == FCS_ONLINE && fcport->rport) - fc_remote_port_block(fcport->rport); + schedule_work(&fcport->rport_del_work); + /* * We may need to retry the login, so don't change the state of the * port but do the retries. @@ -1697,7 +1702,7 @@ qla2x00_mark_all_devices_lost(scsi_qla_host_t *ha) if (atomic_read(&fcport->state) == FCS_DEVICE_DEAD) continue; if (atomic_read(&fcport->state) == FCS_ONLINE && fcport->rport) - fc_remote_port_block(fcport->rport); + schedule_work(&fcport->rport_del_work); atomic_set(&fcport->state, FCS_DEVICE_LOST); } } diff --git a/drivers/scsi/qla2xxx/qla_rscn.c b/drivers/scsi/qla2xxx/qla_rscn.c index 3e53f62d640..2c3342108dd 100644 --- a/drivers/scsi/qla2xxx/qla_rscn.c +++ b/drivers/scsi/qla2xxx/qla_rscn.c @@ -320,8 +320,7 @@ qla2x00_update_login_fcport(scsi_qla_host_t *ha, struct mbx_entry *mbxstat, fcport->flags &= ~FCF_FAILOVER_NEEDED; fcport->iodesc_idx_sent = IODESC_INVALID_INDEX; atomic_set(&fcport->state, FCS_ONLINE); - if (fcport->rport) - fc_remote_port_unblock(fcport->rport); + schedule_work(&fcport->rport_add_work); } diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index 27702097b7f..ca098fc2a60 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -210,7 +210,7 @@ fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names) #define FC_MGMTSRVR_PORTID 0x00000a -static void fc_timeout_blocked_rport(void *data); +static void fc_timeout_deleted_rport(void *data); static void fc_scsi_scan_rport(void *data); static void fc_rport_terminate(struct fc_rport *rport); @@ -384,7 +384,9 @@ show_fc_rport_##field (struct class_device *cdev, char *buf) \ struct fc_rport *rport = transport_class_to_rport(cdev); \ struct Scsi_Host *shost = rport_to_shost(rport); \ struct fc_internal *i = to_fc_internal(shost->transportt); \ - if (i->f->get_rport_##field) \ + if ((i->f->get_rport_##field) && \ + !((rport->port_state == FC_PORTSTATE_BLOCKED) || \ + (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \ i->f->get_rport_##field(rport); \ return snprintf(buf, sz, format_string, cast rport->field); \ } @@ -398,6 +400,9 @@ store_fc_rport_##field(struct class_device *cdev, const char *buf, \ struct fc_rport *rport = transport_class_to_rport(cdev); \ struct Scsi_Host *shost = rport_to_shost(rport); \ struct fc_internal *i = to_fc_internal(shost->transportt); \ + if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \ + (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \ + return -EBUSY; \ val = simple_strtoul(buf, NULL, 0); \ i->f->set_rport_##field(rport, val); \ return count; \ @@ -500,7 +505,29 @@ static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO, /* Dynamic Remote Port Attributes */ -fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20); +/* + * dev_loss_tmo attribute + */ +fc_rport_show_function(dev_loss_tmo, "%d\n", 20, ) +static ssize_t +store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf, + size_t count) +{ + int val; + struct fc_rport *rport = transport_class_to_rport(cdev); + struct Scsi_Host *shost = rport_to_shost(rport); + struct fc_internal *i = to_fc_internal(shost->transportt); + if ((rport->port_state == FC_PORTSTATE_BLOCKED) || + (rport->port_state == FC_PORTSTATE_NOTPRESENT)) + return -EBUSY; + val = simple_strtoul(buf, NULL, 0); + if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)) + return -EINVAL; + i->f->set_rport_dev_loss_tmo(rport, val); + return count; +} +static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR, + show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo); /* Private Remote Port Attributes */ @@ -1214,6 +1241,25 @@ fc_remove_host(struct Scsi_Host *shost) } EXPORT_SYMBOL(fc_remove_host); +/* + * fc_rport_tgt_remove - Removes the scsi target on the remote port + * @rport: The remote port to be operated on + */ +static void +fc_rport_tgt_remove(struct fc_rport *rport) +{ + struct Scsi_Host *shost = rport_to_shost(rport); + + scsi_target_unblock(&rport->dev); + + /* Stop anything on the workq */ + if (!cancel_delayed_work(&rport->dev_loss_work)) + flush_scheduled_work(); + scsi_flush_work(shost); + + scsi_remove_target(&rport->dev); +} + /** * fc_rport_create - allocates and creates a remote FC port. * @shost: scsi host the remote port is connected to. @@ -1260,7 +1306,7 @@ fc_rport_create(struct Scsi_Host *shost, int channel, rport->dd_data = &rport[1]; rport->channel = channel; - INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport); + INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport); INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport); spin_lock_irqsave(shost->host_lock, flags); @@ -1352,17 +1398,93 @@ struct fc_rport * fc_remote_port_add(struct Scsi_Host *shost, int channel, struct fc_rport_identifiers *ids) { + struct fc_internal *fci = to_fc_internal(shost->transportt); struct fc_rport *rport; unsigned long flags; int match = 0; + /* + * Search the list of "active" rports, for an rport that has been + * deleted, but we've held off the real delete while the target + * is in a "blocked" state. + */ + spin_lock_irqsave(shost->host_lock, flags); + + list_for_each_entry(rport, &fc_host_rports(shost), peers) { + + if ((rport->port_state == FC_PORTSTATE_BLOCKED) && + (rport->channel == channel)) { + + switch (fc_host_tgtid_bind_type(shost)) { + case FC_TGTID_BIND_BY_WWPN: + case FC_TGTID_BIND_NONE: + if (rport->port_name == ids->port_name) + match = 1; + break; + case FC_TGTID_BIND_BY_WWNN: + if (rport->node_name == ids->node_name) + match = 1; + break; + case FC_TGTID_BIND_BY_ID: + if (rport->port_id == ids->port_id) + match = 1; + break; + } + + if (match) { + struct work_struct *work = + &rport->dev_loss_work; + + memcpy(&rport->node_name, &ids->node_name, + sizeof(rport->node_name)); + memcpy(&rport->port_name, &ids->port_name, + sizeof(rport->port_name)); + rport->port_id = ids->port_id; + + rport->port_state = FC_PORTSTATE_ONLINE; + rport->roles = ids->roles; + + spin_unlock_irqrestore(shost->host_lock, flags); + + if (fci->f->dd_fcrport_size) + memset(rport->dd_data, 0, + fci->f->dd_fcrport_size); + + /* + * If we were blocked, we were a target. + * If no longer a target, we leave the timer + * running in case the port changes roles + * prior to the timer expiring. If the timer + * fires, the target will be torn down. + */ + if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET)) + return rport; + + /* restart the target */ + + /* + * Stop the target timer first. Take no action + * on the del_timer failure as the state + * machine state change will validate the + * transaction. + */ + if (!cancel_delayed_work(work)) + flush_scheduled_work(); + + /* initiate a scan of the target */ + scsi_queue_work(shost, &rport->scan_work); + + return rport; + } + } + } + + /* Search the bindings array */ if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) && (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) { /* search for a matching consistent binding */ - spin_lock_irqsave(shost->host_lock, flags); - list_for_each_entry(rport, &fc_host_rport_bindings(shost), peers) { if (rport->channel != channel) @@ -1392,8 +1514,6 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel, } } - spin_unlock_irqrestore(shost->host_lock, flags); - if (match) { memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name)); @@ -1403,6 +1523,12 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel, rport->roles = ids->roles; rport->port_state = FC_PORTSTATE_ONLINE; + spin_unlock_irqrestore(shost->host_lock, flags); + + if (fci->f->dd_fcrport_size) + memset(rport->dd_data, 0, + fci->f->dd_fcrport_size); + if (rport->roles & FC_RPORT_ROLE_FCP_TARGET) /* initiate a scan of the target */ scsi_queue_work(shost, &rport->scan_work); @@ -1411,6 +1537,8 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel, } } + spin_unlock_irqrestore(shost->host_lock, flags); + /* No consistent binding found - create new remote port entry */ rport = fc_rport_create(shost, channel, ids); @@ -1419,25 +1547,6 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel, EXPORT_SYMBOL(fc_remote_port_add); /* - * fc_rport_tgt_remove - Removes the scsi target on the remote port - * @rport: The remote port to be operated on - */ -static void -fc_rport_tgt_remove(struct fc_rport *rport) -{ - struct Scsi_Host *shost = rport_to_shost(rport); - - scsi_target_unblock(&rport->dev); - - /* Stop anything on the workq */ - if (!cancel_delayed_work(&rport->dev_loss_work)) - flush_scheduled_work(); - scsi_flush_work(shost); - - scsi_remove_target(&rport->dev); -} - -/* * fc_rport_terminate - this routine tears down and deallocates a remote port. * @rport: The remote port to be terminated * @@ -1470,24 +1579,44 @@ fc_rport_terminate(struct fc_rport *rport) * The LLDD calls this routine to notify the transport that a remote * port is no longer part of the topology. Note: Although a port * may no longer be part of the topology, it may persist in the remote - * ports displayed by the fc_host. This is done so that target id - * mappings (managed via the remote port structures), are always visible - * as long as the mapping is valid, regardless of port state, + * ports displayed by the fc_host. We do this under 2 conditions: + * - If the port was a scsi target, we delay its deletion by "blocking" it. + * This allows the port to temporarily disappear, then reappear without + * disrupting the SCSI device tree attached to it. During the "blocked" + * period the port will still exist. + * - If the port was a scsi target and disappears for longer than we + * expect, we'll delete the port and the tear down the SCSI device tree + * attached to it. However, we want to semi-persist the target id assigned + * to that port if it eventually does exist. The port structure will + * remain (although with minimal information) so that the target id + * bindings remails. * * If the remote port is not an FCP Target, it will be fully torn down * and deallocated, including the fc_remote_port class device. * - * If the remote port is an FCP Target, the port structure will be - * marked as Not Present, but will remain as long as there is a valid - * SCSI target id mapping associated with the port structure. Validity - * is determined by the binding type. If binding by wwpn, then the port - * structure is always valid and will not be deallocated until the host - * is removed. If binding by wwnn, then the port structure is valid - * until another port with the same node name is found in the topology. - * If binding by port id (fc address), then the port structure is valid - * valid until another port with the same address is identified. + * If the remote port is an FCP Target, the port will be placed in a + * temporary blocked state. From the LLDD's perspective, the rport no + * longer exists. From the SCSI midlayer's perspective, the SCSI target + * exists, but all sdevs on it are blocked from further I/O. The following + * is then expected: + * If the remote port does not return (signaled by a LLDD call to + * fc_remote_port_add()) within the dev_loss_tmo timeout, then the + * scsi target is removed - killing all outstanding i/o and removing the + * scsi devices attached ot it. The port structure will be marked Not + * Present and be partially cleared, leaving only enough information to + * recognize the remote port relative to the scsi target id binding if + * it later appears. The port will remain as long as there is a valid + * binding (e.g. until the user changes the binding type or unloads the + * scsi host with the binding). * - * Called from interrupt or normal process context. + * If the remote port returns within the dev_loss_tmo value (and matches + * according to the target id binding type), the port structure will be + * reused. If it is no longer a SCSI target, the target will be torn + * down. If it continues to be a SCSI target, then the target will be + * unblocked (allowing i/o to be resumed), and a scan will be activated + * to ensure that all luns are detected. + * + * Called from normal process context only - cannot be called from interrupt. * * Notes: * This routine assumes no locks are held on entry. @@ -1495,53 +1624,20 @@ fc_rport_terminate(struct fc_rport *rport) void fc_remote_port_delete(struct fc_rport *rport) { - struct Scsi_Host *shost = rport_to_shost(rport); - unsigned long flags; + int timeout = rport->dev_loss_tmo; - /* If no scsi target id mapping or consistent binding type, delete it */ - if ((rport->scsi_target_id == -1) || - (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) { + /* If no scsi target id mapping, delete it */ + if (rport->scsi_target_id == -1) { fc_rport_terminate(rport); return; } - fc_rport_tgt_remove(rport); - - spin_lock_irqsave(shost->host_lock, flags); - list_move_tail(&rport->peers, &fc_host_rport_bindings(shost)); - spin_unlock_irqrestore(shost->host_lock, flags); - - /* - * Note: We do not remove or clear the hostdata area. This allows - * host-specific target data to persist along with the - * scsi_target_id. It's up to the host to manage it's hostdata area. - */ + scsi_target_block(&rport->dev); - /* - * Reinitialize port attributes that may change if the port comes back. - */ - rport->maxframe_size = -1; - rport->supported_classes = FC_COS_UNSPECIFIED; - rport->roles = FC_RPORT_ROLE_UNKNOWN; - rport->port_state = FC_PORTSTATE_NOTPRESENT; + /* cap the length the devices can be blocked until they are deleted */ + schedule_delayed_work(&rport->dev_loss_work, timeout * HZ); - /* remove the identifiers that aren't used in the consisting binding */ - switch (fc_host_tgtid_bind_type(shost)) { - case FC_TGTID_BIND_BY_WWPN: - rport->node_name = -1; - rport->port_id = -1; - break; - case FC_TGTID_BIND_BY_WWNN: - rport->port_name = -1; - rport->port_id = -1; - break; - case FC_TGTID_BIND_BY_ID: - rport->node_name = -1; - rport->port_name = -1; - break; - case FC_TGTID_BIND_NONE: /* to keep compiler happy */ - break; - } + rport->port_state = FC_PORTSTATE_BLOCKED; } EXPORT_SYMBOL(fc_remote_port_delete); @@ -1574,127 +1670,140 @@ fc_remote_port_rolechg(struct fc_rport *rport, u32 roles) unsigned long flags; int create = 0; - rport->roles = roles; - spin_lock_irqsave(shost->host_lock, flags); - if ((rport->scsi_target_id == -1) && - (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) { - rport->scsi_target_id = fc_host->next_target_id++; - create = 1; + if (roles & FC_RPORT_ROLE_FCP_TARGET) { + if (rport->scsi_target_id == -1) { + rport->scsi_target_id = fc_host->next_target_id++; + create = 1; + } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET)) + create = 1; } spin_unlock_irqrestore(shost->host_lock, flags); - if (create) + rport->roles = roles; + + if (create) { + /* + * There may have been a delete timer running on the + * port. Ensure that it is cancelled as we now know + * the port is an FCP Target. + * Note: we know the rport is exists and in an online + * state as the LLDD would not have had an rport + * reference to pass us. + * + * Take no action on the del_timer failure as the state + * machine state change will validate the + * transaction. + */ + if (!cancel_delayed_work(&rport->dev_loss_work)) + flush_scheduled_work(); + /* initiate a scan of the target */ scsi_queue_work(shost, &rport->scan_work); + } } EXPORT_SYMBOL(fc_remote_port_rolechg); /** - * fc_timeout_blocked_rport - Timeout handler for blocked remote port - * that fails to return in the alloted time. - * @data: scsi target that failed to reappear in the alloted time. + * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that + * was a SCSI target (thus was blocked), and failed + * to return in the alloted time. + * + * @data: rport target that failed to reappear in the alloted time. **/ static void -fc_timeout_blocked_rport(void *data) +fc_timeout_deleted_rport(void *data) { struct fc_rport *rport = (struct fc_rport *)data; + struct Scsi_Host *shost = rport_to_shost(rport); + unsigned long flags; - rport->port_state = FC_PORTSTATE_OFFLINE; - - dev_printk(KERN_ERR, &rport->dev, - "blocked FC remote port time out: removing target\n"); + spin_lock_irqsave(shost->host_lock, flags); /* - * As this only occurs if the remote port (scsi target) - * went away and didn't come back - we'll remove - * all attached scsi devices. + * If the port is ONLINE, then it came back, but was no longer an + * FCP target. Thus we need to tear down the scsi_target on it. */ - scsi_target_unblock(&rport->dev); - scsi_remove_target(&rport->dev); -} + if (rport->port_state == FC_PORTSTATE_ONLINE) { + spin_unlock_irqrestore(shost->host_lock, flags); -/** - * fc_remote_port_block - temporarily block any scsi traffic to a remote port. - * @rport: remote port to be blocked. - * - * scsi lldd's with a FC transport call this routine to temporarily stop - * all scsi traffic to a remote port. If the port is not a SCSI target, - * no action is taken. If the port is a SCSI target, all attached devices - * are placed into a SDEV_BLOCK state and a timer is started. The timer is - * represents the maximum amount of time the port may be blocked. If the - * timer expires, the port is considered non-existent and the attached - * scsi devices will be removed. - * - * Called from interrupt or normal process context. - * - * Returns zero if successful or error if not - * - * Notes: - * This routine assumes no locks are held on entry. - * - * The timeout and timer types are extracted from the fc transport - * attributes from the caller's rport pointer. - **/ -int -fc_remote_port_block(struct fc_rport *rport) -{ - int timeout = rport->dev_loss_tmo; - struct work_struct *work = &rport->dev_loss_work; + dev_printk(KERN_ERR, &rport->dev, + "blocked FC remote port time out: removing target\n"); - if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT) - return -EINVAL; + fc_rport_tgt_remove(rport); - scsi_target_block(&rport->dev); + return; + } - /* cap the length the devices can be blocked */ - schedule_delayed_work(work, timeout * HZ); + if (rport->port_state != FC_PORTSTATE_BLOCKED) { + spin_unlock_irqrestore(shost->host_lock, flags); + dev_printk(KERN_ERR, &rport->dev, + "blocked FC remote port time out: leaving target alone\n"); + return; + } - rport->port_state = FC_PORTSTATE_BLOCKED; - return 0; -} -EXPORT_SYMBOL(fc_remote_port_block); + if (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE) { + spin_unlock_irqrestore(shost->host_lock, flags); + dev_printk(KERN_ERR, &rport->dev, + "blocked FC remote port time out: removing target\n"); + fc_rport_terminate(rport); + return; + } -/** - * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port. - * @rport: remote port to be unblocked. - * - * scsi lld's with a FC transport call this routine to restart IO to all - * devices associated with the caller's scsi target following a fc_target_block - * request. Called from interrupt or normal process context. - * - * Notes: - * This routine assumes no locks are held on entry. - **/ - void -fc_remote_port_unblock(struct fc_rport *rport) -{ - struct work_struct *work = &rport->dev_loss_work; - struct Scsi_Host *shost = rport_to_shost(rport); + dev_printk(KERN_ERR, &rport->dev, + "blocked FC remote port time out: removing target and " + "saving binding\n"); + + list_move_tail(&rport->peers, &fc_host_rport_bindings(shost)); /* - * Stop the target timer first. Take no action on the del_timer - * failure as the state machine state change will validate the - * transaction. + * Note: We do not remove or clear the hostdata area. This allows + * host-specific target data to persist along with the + * scsi_target_id. It's up to the host to manage it's hostdata area. */ - if (!cancel_delayed_work(work)) - flush_scheduled_work(); - if (rport->port_state == FC_PORTSTATE_OFFLINE) - /* - * initiate a scan of the target as the target has - * been torn down. - */ - scsi_queue_work(shost, &rport->scan_work); - else - scsi_target_unblock(&rport->dev); + /* + * Reinitialize port attributes that may change if the port comes back. + */ + rport->maxframe_size = -1; + rport->supported_classes = FC_COS_UNSPECIFIED; + rport->roles = FC_RPORT_ROLE_UNKNOWN; + rport->port_state = FC_PORTSTATE_NOTPRESENT; - rport->port_state = FC_PORTSTATE_ONLINE; + /* remove the identifiers that aren't used in the consisting binding */ + switch (fc_host_tgtid_bind_type(shost)) { + case FC_TGTID_BIND_BY_WWPN: + rport->node_name = -1; + rport->port_id = -1; + break; + case FC_TGTID_BIND_BY_WWNN: + rport->port_name = -1; + rport->port_id = -1; + break; + case FC_TGTID_BIND_BY_ID: + rport->node_name = -1; + rport->port_name = -1; + break; + case FC_TGTID_BIND_NONE: /* to keep compiler happy */ + break; + } + + spin_unlock_irqrestore(shost->host_lock, flags); + + /* + * As this only occurs if the remote port (scsi target) + * went away and didn't come back - we'll remove + * all attached scsi devices. + */ + fc_rport_tgt_remove(rport); } -EXPORT_SYMBOL(fc_remote_port_unblock); /** * fc_scsi_scan_rport - called to perform a scsi scan on a remote port. + * + * Will unblock the target (in case it went away and has now come back), + * then invoke a scan. + * * @data: remote port to be scanned. **/ static void @@ -1702,6 +1811,7 @@ fc_scsi_scan_rport(void *data) { struct fc_rport *rport = (struct fc_rport *)data; + scsi_target_unblock(&rport->dev); scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id, SCAN_WILD_CARD, 1); } diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h index 4496b32972e..319ff7a60df 100644 --- a/include/scsi/scsi_transport_fc.h +++ b/include/scsi/scsi_transport_fc.h @@ -28,6 +28,7 @@ #define SCSI_TRANSPORT_FC_H #include <linux/config.h> +#include <scsi/scsi.h> struct scsi_transport_template; @@ -429,6 +430,34 @@ struct fc_function_template { }; +/** + * fc_remote_port_chkready - called to validate the remote port state + * prior to initiating io to the port. + * + * Returns a scsi result code that can be returned by the LLDD. + * + * @rport: remote port to be checked + **/ +static inline int +fc_remote_port_chkready(struct fc_rport *rport) +{ + int result; + + switch (rport->port_state) { + case FC_PORTSTATE_ONLINE: + result = 0; + break; + case FC_PORTSTATE_BLOCKED: + result = DID_BUS_BUSY << 16; + break; + default: + result = DID_NO_CONNECT << 16; + break; + } + return result; +} + + struct scsi_transport_template *fc_attach_transport( struct fc_function_template *); void fc_release_transport(struct scsi_transport_template *); @@ -437,8 +466,6 @@ struct fc_rport *fc_remote_port_add(struct Scsi_Host *shost, int channel, struct fc_rport_identifiers *ids); void fc_remote_port_delete(struct fc_rport *rport); void fc_remote_port_rolechg(struct fc_rport *rport, u32 roles); -int fc_remote_port_block(struct fc_rport *rport); -void fc_remote_port_unblock(struct fc_rport *rport); int scsi_is_fc_rport(const struct device *); static inline u64 wwn_to_u64(u8 *wwn) |