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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/module.h>#include <linux/moduleparam.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/types.h>#include <linux/configfs.h>#include <linux/blk-mq.h>#include <scsi/scsi.h>#include <scsi/scsi_tcq.h>#include <scsi/scsi_host.h>#include <scsi/scsi_device.h>#include <scsi/scsi_cmnd.h>
#include <target/target_core_base.h>#include <target/target_core_fabric.h>
#include "tcm_loop.h"
#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
static struct kmem_cache *tcm_loop_cmd_cache;
static int tcm_loop_hba_no_cnt;
static int tcm_loop_queue_status(struct se_cmd *se_cmd);
static unsigned int tcm_loop_nr_hw_queues = 1;module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
static unsigned int tcm_loop_can_queue = 1024;module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
static unsigned int tcm_loop_cmd_per_lun = 1024;module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
/* * Called from struct target_core_fabric_ops->check_stop_free() */static int tcm_loop_check_stop_free(struct se_cmd *se_cmd){ return transport_generic_free_cmd(se_cmd, 0);}
static void tcm_loop_release_cmd(struct se_cmd *se_cmd){ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, struct tcm_loop_cmd, tl_se_cmd); struct scsi_cmnd *sc = tl_cmd->sc;
if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); else scsi_done(sc);}
static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host){ seq_puts(m, "tcm_loop_proc_info()\n"); return 0;}
static int tcm_loop_driver_probe(struct device *);static void tcm_loop_driver_remove(struct device *);
static const struct bus_type tcm_loop_lld_bus = { .name = "tcm_loop_bus", .probe = tcm_loop_driver_probe, .remove = tcm_loop_driver_remove,};
static struct device_driver tcm_loop_driverfs = { .name = "tcm_loop", .bus = &tcm_loop_lld_bus,};/* * Used with root_device_register() in tcm_loop_alloc_core_bus() below */static struct device *tcm_loop_primary;
static void tcm_loop_target_queue_cmd(struct tcm_loop_cmd *tl_cmd){ struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; struct scsi_cmnd *sc = tl_cmd->sc; struct tcm_loop_nexus *tl_nexus; struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg; struct scatterlist *sgl_bidi = NULL; u32 sgl_bidi_count = 0, transfer_length;
tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
/* * Ensure that this tl_tpg reference from the incoming sc->device->id * has already been configured via tcm_loop_make_naa_tpg(). */ if (!tl_tpg->tl_hba) { set_host_byte(sc, DID_NO_CONNECT); goto out_done; } if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { set_host_byte(sc, DID_TRANSPORT_DISRUPTED); goto out_done; } tl_nexus = tl_tpg->tl_nexus; if (!tl_nexus) { scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus does not exist\n"); set_host_byte(sc, DID_ERROR); goto out_done; }
transfer_length = scsi_transfer_length(sc); if (!scsi_prot_sg_count(sc) && scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { se_cmd->prot_pto = true; /* * loopback transport doesn't support * WRITE_GENERATE, READ_STRIP protection * information operations, go ahead unprotected. */ transfer_length = scsi_bufflen(sc); }
se_cmd->tag = tl_cmd->sc_cmd_tag; target_init_cmd(se_cmd, tl_nexus->se_sess, &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, transfer_length, TCM_SIMPLE_TAG, sc->sc_data_direction, 0);
if (target_submit_prep(se_cmd, sc->cmnd, scsi_sglist(sc), scsi_sg_count(sc), sgl_bidi, sgl_bidi_count, scsi_prot_sglist(sc), scsi_prot_sg_count(sc), GFP_ATOMIC)) return;
target_submit(se_cmd); return;
out_done: scsi_done(sc);}
/* * ->queuecommand can be and usually is called from interrupt context, so * defer the actual submission to a workqueue. */static enum scsi_qc_status tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc){ struct tcm_loop_cmd *tl_cmd = scsi_cmd_priv(sc);
pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n", __func__, sc->device->host->host_no, sc->device->id, sc->device->channel, sc->device->lun, sc->cmnd[0], scsi_bufflen(sc));
memset(tl_cmd, 0, sizeof(*tl_cmd)); tl_cmd->sc = sc; tl_cmd->sc_cmd_tag = blk_mq_unique_tag(scsi_cmd_to_rq(sc));
tcm_loop_target_queue_cmd(tl_cmd); return 0;}
/* * Called from SCSI EH process context to issue a LUN_RESET TMR * to struct scsi_device */static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, u64 lun, int task, enum tcm_tmreq_table tmr){ struct se_cmd *se_cmd; struct se_session *se_sess; struct tcm_loop_nexus *tl_nexus; struct tcm_loop_cmd *tl_cmd; int ret = TMR_FUNCTION_FAILED, rc;
/* * Locate the tl_nexus and se_sess pointers */ tl_nexus = tl_tpg->tl_nexus; if (!tl_nexus) { pr_err("Unable to perform device reset without active I_T Nexus\n"); return ret; }
tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); if (!tl_cmd) return ret;
init_completion(&tl_cmd->tmr_done);
se_cmd = &tl_cmd->tl_se_cmd; se_sess = tl_tpg->tl_nexus->se_sess;
rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun, NULL, tmr, GFP_KERNEL, task, TARGET_SCF_ACK_KREF); if (rc < 0) goto release; wait_for_completion(&tl_cmd->tmr_done); ret = se_cmd->se_tmr_req->response; target_put_sess_cmd(se_cmd);
out: return ret;
release: kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); goto out;}
static int tcm_loop_abort_task(struct scsi_cmnd *sc){ struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg; int ret;
/* * Locate the tcm_loop_hba_t pointer */ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, blk_mq_unique_tag(scsi_cmd_to_rq(sc)), TMR_ABORT_TASK); return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;}
/* * Called from SCSI EH process context to issue a LUN_RESET TMR * to struct scsi_device */static int tcm_loop_device_reset(struct scsi_cmnd *sc){ struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg; int ret;
/* * Locate the tcm_loop_hba_t pointer */ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, 0, TMR_LUN_RESET); return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;}
static const struct scsi_host_template tcm_loop_driver_template = { .show_info = tcm_loop_show_info, .proc_name = "tcm_loopback", .name = "TCM_Loopback", .queuecommand = tcm_loop_queuecommand, .change_queue_depth = scsi_change_queue_depth, .eh_abort_handler = tcm_loop_abort_task, .eh_device_reset_handler = tcm_loop_device_reset, .this_id = -1, .sg_tablesize = 256, .max_sectors = 0xFFFF, .dma_boundary = PAGE_SIZE - 1, .module = THIS_MODULE, .track_queue_depth = 1, .cmd_size = sizeof(struct tcm_loop_cmd),};
static int tcm_loop_driver_probe(struct device *dev){ struct tcm_loop_hba *tl_hba; struct Scsi_Host *sh; int error, host_prot;
tl_hba = to_tcm_loop_hba(dev);
sh = scsi_host_alloc(&tcm_loop_driver_template, sizeof(struct tcm_loop_hba)); if (!sh) { pr_err("Unable to allocate struct scsi_host\n"); return -ENODEV; } tl_hba->sh = sh;
/* * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata */ *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; /* * Setup single ID, Channel and LUN for now.. */ sh->max_id = 2; sh->max_lun = 0; sh->max_channel = 0; sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; sh->nr_hw_queues = tcm_loop_nr_hw_queues; sh->can_queue = tcm_loop_can_queue; sh->cmd_per_lun = tcm_loop_cmd_per_lun;
host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
scsi_host_set_prot(sh, host_prot); scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
error = scsi_add_host(sh, &tl_hba->dev); if (error) { pr_err("%s: scsi_add_host failed\n", __func__); scsi_host_put(sh); tl_hba->sh = NULL; return -ENODEV; } return 0;}
static void tcm_loop_driver_remove(struct device *dev){ struct tcm_loop_hba *tl_hba; struct Scsi_Host *sh;
tl_hba = to_tcm_loop_hba(dev); sh = tl_hba->sh;
if (sh) { scsi_remove_host(sh); scsi_host_put(sh); }}
static void tcm_loop_release_adapter(struct device *dev){ struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
kfree(tl_hba);}
/* * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c */static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id){ int ret;
tl_hba->dev.bus = &tcm_loop_lld_bus; tl_hba->dev.parent = tcm_loop_primary; tl_hba->dev.release = &tcm_loop_release_adapter; dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
ret = device_register(&tl_hba->dev); if (ret) { pr_err("device_register() failed for tl_hba->dev: %d\n", ret); put_device(&tl_hba->dev); return -ENODEV; }
if (!tl_hba->sh) { device_unregister(&tl_hba->dev); return -ENODEV; }
return 0;}
/* * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated * tcm_loop SCSI bus. */static int tcm_loop_alloc_core_bus(void){ int ret;
tcm_loop_primary = root_device_register("tcm_loop_0"); if (IS_ERR(tcm_loop_primary)) { pr_err("Unable to allocate tcm_loop_primary\n"); return PTR_ERR(tcm_loop_primary); }
ret = bus_register(&tcm_loop_lld_bus); if (ret) { pr_err("bus_register() failed for tcm_loop_lld_bus\n"); goto dev_unreg; }
ret = driver_register(&tcm_loop_driverfs); if (ret) { pr_err("driver_register() failed for tcm_loop_driverfs\n"); goto bus_unreg; }
pr_debug("Initialized TCM Loop Core Bus\n"); return ret;
bus_unreg: bus_unregister(&tcm_loop_lld_bus);dev_unreg: root_device_unregister(tcm_loop_primary); return ret;}
static void tcm_loop_release_core_bus(void){ driver_unregister(&tcm_loop_driverfs); bus_unregister(&tcm_loop_lld_bus); root_device_unregister(tcm_loop_primary);
pr_debug("Releasing TCM Loop Core BUS\n");}
static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg){ return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);}
static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg){ /* * Return the passed NAA identifier for the Target Port */ return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];}
static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg){ /* * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 * to represent the SCSI Target Port. */ return tl_tpg(se_tpg)->tl_tpgt;}
/* * Returning (1) here allows for target_core_mod struct se_node_acl to be generated * based upon the incoming fabric dependent SCSI Initiator Port */static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg){ return 1;}
static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg){ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); return tl_tpg->tl_fabric_prot_type;}
static u32 tcm_loop_sess_get_index(struct se_session *se_sess){ return 1;}
static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd){ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, struct tcm_loop_cmd, tl_se_cmd);
return tl_cmd->sc_cmd_state;}
static int tcm_loop_write_pending(struct se_cmd *se_cmd){ /* * Since Linux/SCSI has already sent down a struct scsi_cmnd * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array * memory, and memory has already been mapped to struct se_cmd->t_mem_list * format with transport_generic_map_mem_to_cmd(). * * We now tell TCM to add this WRITE CDB directly into the TCM storage * object execution queue. */ target_execute_cmd(se_cmd); return 0;}
static int tcm_loop_queue_data_or_status(const char *func, struct se_cmd *se_cmd, u8 scsi_status){ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, struct tcm_loop_cmd, tl_se_cmd); struct scsi_cmnd *sc = tl_cmd->sc;
pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n", func, sc, sc->cmnd[0]);
if (se_cmd->sense_buffer && ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
memcpy(sc->sense_buffer, se_cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); sc->result = SAM_STAT_CHECK_CONDITION; } else sc->result = scsi_status;
set_host_byte(sc, DID_OK); if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) scsi_set_resid(sc, se_cmd->residual_count); return 0;}
static int tcm_loop_queue_data_in(struct se_cmd *se_cmd){ return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);}
static int tcm_loop_queue_status(struct se_cmd *se_cmd){ return tcm_loop_queue_data_or_status(__func__, se_cmd, se_cmd->scsi_status);}
static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd){ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, struct tcm_loop_cmd, tl_se_cmd);
/* Wake up tcm_loop_issue_tmr(). */ complete(&tl_cmd->tmr_done);}
static void tcm_loop_aborted_task(struct se_cmd *se_cmd){ return;}
static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba){ switch (tl_hba->tl_proto_id) { case SCSI_PROTOCOL_SAS: return "SAS"; case SCSI_PROTOCOL_FCP: return "FCP"; case SCSI_PROTOCOL_ISCSI: return "iSCSI"; default: break; }
return "Unknown";}
/* Start items for tcm_loop_port_cit */
static int tcm_loop_port_link( struct se_portal_group *se_tpg, struct se_lun *lun){ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
atomic_inc_mb(&tl_tpg->tl_tpg_port_count); /* * Add Linux/SCSI struct scsi_device by HCTL */ scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); return 0;}
static void tcm_loop_port_unlink( struct se_portal_group *se_tpg, struct se_lun *se_lun){ struct scsi_device *sd; struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg;
tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); tl_hba = tl_tpg->tl_hba;
sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); if (!sd) { pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); return; } /* * Remove Linux/SCSI struct scsi_device by HCTL */ scsi_remove_device(sd); scsi_device_put(sd);
atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");}
/* End items for tcm_loop_port_cit */
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show( struct config_item *item, char *page){ struct se_portal_group *se_tpg = attrib_to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);}
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store( struct config_item *item, const char *page, size_t count){ struct se_portal_group *se_tpg = attrib_to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); unsigned long val; int ret = kstrtoul(page, 0, &val);
if (ret) { pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); return ret; } if (val != 0 && val != 1 && val != 3) { pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); return -EINVAL; } tl_tpg->tl_fabric_prot_type = val;
return count;}
CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { &tcm_loop_tpg_attrib_attr_fabric_prot_type, NULL,};
/* Start items for tcm_loop_nexus_cit */
static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg, struct se_session *se_sess, void *p){ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
tl_tpg->tl_nexus = p; return 0;}
static int tcm_loop_make_nexus( struct tcm_loop_tpg *tl_tpg, const char *name){ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; struct tcm_loop_nexus *tl_nexus; int ret;
if (tl_tpg->tl_nexus) { pr_debug("tl_tpg->tl_nexus already exists\n"); return -EEXIST; }
tl_nexus = kzalloc_obj(*tl_nexus); if (!tl_nexus) return -ENOMEM;
tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0, TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS, name, tl_nexus, tcm_loop_alloc_sess_cb); if (IS_ERR(tl_nexus->se_sess)) { ret = PTR_ERR(tl_nexus->se_sess); kfree(tl_nexus); return ret; }
pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), name); return 0;}
static int tcm_loop_drop_nexus( struct tcm_loop_tpg *tpg){ struct se_session *se_sess; struct tcm_loop_nexus *tl_nexus;
tl_nexus = tpg->tl_nexus; if (!tl_nexus) return -ENODEV;
se_sess = tl_nexus->se_sess; if (!se_sess) return -ENODEV;
if (atomic_read(&tpg->tl_tpg_port_count)) { pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n", atomic_read(&tpg->tl_tpg_port_count)); return -EPERM; }
pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), tl_nexus->se_sess->se_node_acl->initiatorname); /* * Release the SCSI I_T Nexus to the emulated Target Port */ target_remove_session(se_sess); tpg->tl_nexus = NULL; kfree(tl_nexus); return 0;}
/* End items for tcm_loop_nexus_cit */
static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page){ struct se_portal_group *se_tpg = to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); struct tcm_loop_nexus *tl_nexus; ssize_t ret;
tl_nexus = tl_tpg->tl_nexus; if (!tl_nexus) return -ENODEV;
ret = snprintf(page, PAGE_SIZE, "%s\n", tl_nexus->se_sess->se_node_acl->initiatorname);
return ret;}
static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item, const char *page, size_t count){ struct se_portal_group *se_tpg = to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; int ret; /* * Shutdown the active I_T nexus if 'NULL' is passed.. */ if (!strncmp(page, "NULL", 4)) { ret = tcm_loop_drop_nexus(tl_tpg); return (!ret) ? count : ret; } /* * Otherwise make sure the passed virtual Initiator port WWN matches * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call * tcm_loop_make_nexus() */ if (strlen(page) >= TL_WWN_ADDR_LEN) { pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", page, TL_WWN_ADDR_LEN); return -EINVAL; } snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
ptr = strstr(i_port, "naa."); if (ptr) { if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", i_port, tcm_loop_dump_proto_id(tl_hba)); return -EINVAL; } port_ptr = &i_port[0]; goto check_newline; } ptr = strstr(i_port, "fc."); if (ptr) { if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", i_port, tcm_loop_dump_proto_id(tl_hba)); return -EINVAL; } port_ptr = &i_port[3]; /* Skip over "fc." */ goto check_newline; } ptr = strstr(i_port, "iqn."); if (ptr) { if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", i_port, tcm_loop_dump_proto_id(tl_hba)); return -EINVAL; } port_ptr = &i_port[0]; goto check_newline; } pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", i_port); return -EINVAL; /* * Clear any trailing newline for the NAA WWN */check_newline: if (i_port[strlen(i_port)-1] == '\n') i_port[strlen(i_port)-1] = '\0';
ret = tcm_loop_make_nexus(tl_tpg, port_ptr); if (ret < 0) return ret;
return count;}
static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item, char *page){ struct se_portal_group *se_tpg = to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); const char *status = NULL; ssize_t ret = -EINVAL;
switch (tl_tpg->tl_transport_status) { case TCM_TRANSPORT_ONLINE: status = "online"; break; case TCM_TRANSPORT_OFFLINE: status = "offline"; break; default: break; }
if (status) ret = snprintf(page, PAGE_SIZE, "%s\n", status);
return ret;}
static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item, const char *page, size_t count){ struct se_portal_group *se_tpg = to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
if (!strncmp(page, "online", 6)) { tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; return count; } if (!strncmp(page, "offline", 7)) { tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; if (tl_tpg->tl_nexus) { struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
core_allocate_nexus_loss_ua(tl_sess->se_node_acl); } return count; } return -EINVAL;}
static ssize_t tcm_loop_tpg_address_show(struct config_item *item, char *page){ struct se_portal_group *se_tpg = to_tpg(item); struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
if (!tl_hba->sh) return -ENODEV;
return snprintf(page, PAGE_SIZE, "%d:0:%d\n", tl_hba->sh->host_no, tl_tpg->tl_tpgt);}
CONFIGFS_ATTR(tcm_loop_tpg_, nexus);CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
static struct configfs_attribute *tcm_loop_tpg_attrs[] = { &tcm_loop_tpg_attr_nexus, &tcm_loop_tpg_attr_transport_status, &tcm_loop_tpg_attr_address, NULL,};
/* Start items for tcm_loop_naa_cit */
static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn, const char *name){ struct tcm_loop_hba *tl_hba = container_of(wwn, struct tcm_loop_hba, tl_hba_wwn); struct tcm_loop_tpg *tl_tpg; int ret; unsigned long tpgt;
if (strstr(name, "tpgt_") != name) { pr_err("Unable to locate \"tpgt_#\" directory group\n"); return ERR_PTR(-EINVAL); } if (kstrtoul(name+5, 10, &tpgt)) return ERR_PTR(-EINVAL);
if (tpgt >= TL_TPGS_PER_HBA) { pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n", tpgt, TL_TPGS_PER_HBA); return ERR_PTR(-EINVAL); } tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; tl_tpg->tl_hba = tl_hba; tl_tpg->tl_tpgt = tpgt; /* * Register the tl_tpg as a emulated TCM Target Endpoint */ ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id); if (ret < 0) return ERR_PTR(-ENOMEM);
pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), config_item_name(&wwn->wwn_group.cg_item), tpgt); return &tl_tpg->tl_se_tpg;}
static void tcm_loop_drop_naa_tpg( struct se_portal_group *se_tpg){ struct se_wwn *wwn = se_tpg->se_tpg_wwn; struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); struct tcm_loop_hba *tl_hba; unsigned short tpgt;
tl_hba = tl_tpg->tl_hba; tpgt = tl_tpg->tl_tpgt; /* * Release the I_T Nexus for the Virtual target link if present */ tcm_loop_drop_nexus(tl_tpg); /* * Deregister the tl_tpg as a emulated TCM Target Endpoint */ core_tpg_deregister(se_tpg);
tl_tpg->tl_hba = NULL; tl_tpg->tl_tpgt = 0;
pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), config_item_name(&wwn->wwn_group.cg_item), tpgt);}
/* End items for tcm_loop_naa_cit */
/* Start items for tcm_loop_cit */
static struct se_wwn *tcm_loop_make_scsi_hba( struct target_fabric_configfs *tf, struct config_group *group, const char *name){ struct tcm_loop_hba *tl_hba; struct Scsi_Host *sh; char *ptr; int ret, off = 0;
tl_hba = kzalloc_obj(*tl_hba); if (!tl_hba) return ERR_PTR(-ENOMEM);
/* * Determine the emulated Protocol Identifier and Target Port Name * based on the incoming configfs directory name. */ ptr = strstr(name, "naa."); if (ptr) { tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; goto check_len; } ptr = strstr(name, "fc."); if (ptr) { tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; off = 3; /* Skip over "fc." */ goto check_len; } ptr = strstr(name, "iqn."); if (!ptr) { pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); ret = -EINVAL; goto out; } tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
check_len: if (strlen(name) >= TL_WWN_ADDR_LEN) { pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN); ret = -EINVAL; goto out; } snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
/* * Call device_register(tl_hba->dev) to register the emulated * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after * device_register() callbacks in tcm_loop_driver_probe() */ ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); if (ret) return ERR_PTR(ret);
sh = tl_hba->sh; tcm_loop_hba_no_cnt++; pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n", tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); return &tl_hba->tl_hba_wwn;out: kfree(tl_hba); return ERR_PTR(ret);}
static void tcm_loop_drop_scsi_hba( struct se_wwn *wwn){ struct tcm_loop_hba *tl_hba = container_of(wwn, struct tcm_loop_hba, tl_hba_wwn);
pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n", tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address, tl_hba->sh->host_no); /* * Call device_unregister() on the original tl_hba->dev. * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will * release *tl_hba; */ device_unregister(&tl_hba->dev);}
/* Start items for tcm_loop_cit */static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page){ return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);}
CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
static struct configfs_attribute *tcm_loop_wwn_attrs[] = { &tcm_loop_wwn_attr_version, NULL,};
/* End items for tcm_loop_cit */
static const struct target_core_fabric_ops loop_ops = { .module = THIS_MODULE, .fabric_name = "loopback", .tpg_get_wwn = tcm_loop_get_endpoint_wwn, .tpg_get_tag = tcm_loop_get_tag, .tpg_check_demo_mode = tcm_loop_check_demo_mode, .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, .check_stop_free = tcm_loop_check_stop_free, .release_cmd = tcm_loop_release_cmd, .sess_get_index = tcm_loop_sess_get_index, .write_pending = tcm_loop_write_pending, .get_cmd_state = tcm_loop_get_cmd_state, .queue_data_in = tcm_loop_queue_data_in, .queue_status = tcm_loop_queue_status, .queue_tm_rsp = tcm_loop_queue_tm_rsp, .aborted_task = tcm_loop_aborted_task, .fabric_make_wwn = tcm_loop_make_scsi_hba, .fabric_drop_wwn = tcm_loop_drop_scsi_hba, .fabric_make_tpg = tcm_loop_make_naa_tpg, .fabric_drop_tpg = tcm_loop_drop_naa_tpg, .fabric_post_link = tcm_loop_port_link, .fabric_pre_unlink = tcm_loop_port_unlink, .tfc_wwn_attrs = tcm_loop_wwn_attrs, .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, .default_compl_type = TARGET_QUEUE_COMPL, .default_submit_type = TARGET_QUEUE_SUBMIT, .direct_submit_supp = 0,};
static int __init tcm_loop_fabric_init(void){ int ret = -ENOMEM;
tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", sizeof(struct tcm_loop_cmd), __alignof__(struct tcm_loop_cmd), 0, NULL); if (!tcm_loop_cmd_cache) { pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n"); goto out; }
ret = tcm_loop_alloc_core_bus(); if (ret) goto out_destroy_cache;
ret = target_register_template(&loop_ops); if (ret) goto out_release_core_bus;
return 0;
out_release_core_bus: tcm_loop_release_core_bus();out_destroy_cache: kmem_cache_destroy(tcm_loop_cmd_cache);out: return ret;}
static void __exit tcm_loop_fabric_exit(void){ target_unregister_template(&loop_ops); tcm_loop_release_core_bus(); kmem_cache_destroy(tcm_loop_cmd_cache);}
MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");MODULE_LICENSE("GPL");module_init(tcm_loop_fabric_init);module_exit(tcm_loop_fabric_exit);