/******************************************************************************* * * This file contains the Linux/SCSI LLD virtual SCSI initiator driver * for emulated SAS initiator ports * * © Copyright 2011 RisingTide Systems LLC. * * Licensed to the Linux Foundation under the General Public License (GPL) version 2. * * Author: Nicholas A. Bellinger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "tcm_loop.h" #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) /* Local pointer to allocated TCM configfs fabric module */ static struct target_fabric_configfs *tcm_loop_fabric_configfs; static struct kmem_cache *tcm_loop_cmd_cache; static int tcm_loop_hba_no_cnt; /* * Allocate a tcm_loop cmd descriptor from target_core_mod code * * Can be called from interrupt context in tcm_loop_queuecommand() below */ static struct se_cmd *tcm_loop_allocate_core_cmd( struct tcm_loop_hba *tl_hba, struct se_portal_group *se_tpg, struct scsi_cmnd *sc) { struct se_cmd *se_cmd; struct se_session *se_sess; struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus; struct tcm_loop_cmd *tl_cmd; int sam_task_attr; if (!tl_nexus) { scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" " does not exist\n"); set_host_byte(sc, DID_ERROR); return NULL; } se_sess = tl_nexus->se_sess; tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); if (!tl_cmd) { pr_err("Unable to allocate struct tcm_loop_cmd\n"); set_host_byte(sc, DID_ERROR); return NULL; } se_cmd = &tl_cmd->tl_se_cmd; /* * Save the pointer to struct scsi_cmnd *sc */ tl_cmd->sc = sc; /* * Locate the SAM Task Attr from struct scsi_cmnd * */ if (sc->device->tagged_supported) { switch (sc->tag) { case HEAD_OF_QUEUE_TAG: sam_task_attr = MSG_HEAD_TAG; break; case ORDERED_QUEUE_TAG: sam_task_attr = MSG_ORDERED_TAG; break; default: sam_task_attr = MSG_SIMPLE_TAG; break; } } else sam_task_attr = MSG_SIMPLE_TAG; /* * Initialize struct se_cmd descriptor from target_core_mod infrastructure */ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr, &tl_cmd->tl_sense_buf[0]); /* * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi */ if (scsi_bidi_cmnd(sc)) se_cmd->t_tasks_bidi = 1; /* * Locate the struct se_lun pointer and attach it to struct se_cmd */ if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) { kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); set_host_byte(sc, DID_NO_CONNECT); return NULL; } return se_cmd; } /* * Called by struct target_core_fabric_ops->new_cmd_map() * * Always called in process context. A non zero return value * here will signal to handle an exception based on the return code. */ static int tcm_loop_new_cmd_map(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; struct scatterlist *sgl_bidi = NULL; u32 sgl_bidi_count = 0; int ret; /* * Allocate the necessary tasks to complete the received CDB+data */ ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); if (ret == -ENOMEM) { /* Out of Resources */ return PYX_TRANSPORT_LU_COMM_FAILURE; } else if (ret == -EINVAL) { /* * Handle case for SAM_STAT_RESERVATION_CONFLICT */ if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) return PYX_TRANSPORT_RESERVATION_CONFLICT; /* * Otherwise, return SAM_STAT_CHECK_CONDITION and return * sense data. */ return PYX_TRANSPORT_USE_SENSE_REASON; } /* * For BIDI commands, pass in the extra READ buffer * to transport_generic_map_mem_to_cmd() below.. */ if (se_cmd->t_tasks_bidi) { struct scsi_data_buffer *sdb = scsi_in(sc); sgl_bidi = sdb->table.sgl; sgl_bidi_count = sdb->table.nents; } /* * Because some userspace code via scsi-generic do not memset their * associated read buffers, go ahead and do that here for type * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB * by target core in transport_generic_allocate_tasks() -> * transport_generic_cmd_sequencer(). */ if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB && se_cmd->data_direction == DMA_FROM_DEVICE) { struct scatterlist *sg = scsi_sglist(sc); unsigned char *buf = kmap(sg_page(sg)) + sg->offset; if (buf != NULL) { memset(buf, 0, sg->length); kunmap(sg_page(sg)); } } /* Tell the core about our preallocated memory */ ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); if (ret < 0) return PYX_TRANSPORT_LU_COMM_FAILURE; return 0; } /* * Called from struct target_core_fabric_ops->check_stop_free() */ static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) { /* * Do not release struct se_cmd's containing a valid TMR * pointer. These will be released directly in tcm_loop_device_reset() * with transport_generic_free_cmd(). */ if (se_cmd->se_tmr_req) return 0; /* * Release the struct se_cmd, which will make a callback to release * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() */ transport_generic_free_cmd(se_cmd, 0); return 1; } 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); kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); } static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, int inout) { return sprintf(buffer, "tcm_loop_proc_info()\n"); } static int tcm_loop_driver_probe(struct device *); static int tcm_loop_driver_remove(struct device *); static int pseudo_lld_bus_match(struct device *dev, struct device_driver *dev_driver) { return 1; } static struct bus_type tcm_loop_lld_bus = { .name = "tcm_loop_bus", .match = pseudo_lld_bus_match, .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 */ struct device *tcm_loop_primary; /* * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() */ static int tcm_loop_change_queue_depth( struct scsi_device *sdev, int depth, int reason) { switch (reason) { case SCSI_QDEPTH_DEFAULT: scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); break; case SCSI_QDEPTH_QFULL: scsi_track_queue_full(sdev, depth); break; case SCSI_QDEPTH_RAMP_UP: scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); break; default: return -EOPNOTSUPP; } return sdev->queue_depth; } /* * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs) */ static int tcm_loop_queuecommand( struct Scsi_Host *sh, struct scsi_cmnd *sc) { struct se_cmd *se_cmd; struct se_portal_group *se_tpg; struct tcm_loop_hba *tl_hba; struct tcm_loop_tpg *tl_tpg; pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" " scsi_buf_len: %u\n", sc->device->host->host_no, sc->device->id, sc->device->channel, sc->device->lun, sc->cmnd[0], scsi_bufflen(sc)); /* * 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]; /* * 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); sc->scsi_done(sc); return 0; } se_tpg = &tl_tpg->tl_se_tpg; /* * Determine the SAM Task Attribute and allocate tl_cmd and * tl_cmd->tl_se_cmd from TCM infrastructure */ se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc); if (!se_cmd) { sc->scsi_done(sc); return 0; } /* * Queue up the newly allocated to be processed in TCM thread context. */ transport_generic_handle_cdb_map(se_cmd); return 0; } /* * 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 se_cmd *se_cmd = NULL; struct se_portal_group *se_tpg; struct se_session *se_sess; struct tcm_loop_cmd *tl_cmd = NULL; struct tcm_loop_hba *tl_hba; struct tcm_loop_nexus *tl_nexus; struct tcm_loop_tmr *tl_tmr = NULL; struct tcm_loop_tpg *tl_tpg; int ret = FAILED; /* * Locate the tcm_loop_hba_t pointer */ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); /* * Locate the tl_nexus and se_sess pointers */ tl_nexus = tl_hba->tl_nexus; if (!tl_nexus) { pr_err("Unable to perform device reset without" " active I_T Nexus\n"); return FAILED; } se_sess = tl_nexus->se_sess; /* * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id */ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; se_tpg = &tl_tpg->tl_se_tpg; tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); if (!tl_cmd) { pr_err("Unable to allocate memory for tl_cmd\n"); return FAILED; } tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); if (!tl_tmr) { pr_err("Unable to allocate memory for tl_tmr\n"); goto release; } init_waitqueue_head(&tl_tmr->tl_tmr_wait); se_cmd = &tl_cmd->tl_se_cmd; /* * Initialize struct se_cmd descriptor from target_core_mod infrastructure */ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG, &tl_cmd->tl_sense_buf[0]); /* * Allocate the LUN_RESET TMR */ se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr, TMR_LUN_RESET, GFP_KERNEL); if (IS_ERR(se_cmd->se_tmr_req)) goto release; /* * Locate the underlying TCM struct se_lun from sc->device->lun */ if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) goto release; /* * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() * to wake us up. */ transport_generic_handle_tmr(se_cmd); wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); /* * The TMR LUN_RESET has completed, check the response status and * then release allocations. */ ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; release: if (se_cmd) transport_generic_free_cmd(se_cmd, 1); else kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); kfree(tl_tmr); return ret; } static int tcm_loop_slave_alloc(struct scsi_device *sd) { set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); return 0; } static int tcm_loop_slave_configure(struct scsi_device *sd) { return 0; } static struct scsi_host_template tcm_loop_driver_template = { .proc_info = tcm_loop_proc_info, .proc_name = "tcm_loopback", .name = "TCM_Loopback", .queuecommand = tcm_loop_queuecommand, .change_queue_depth = tcm_loop_change_queue_depth, .eh_device_reset_handler = tcm_loop_device_reset, .can_queue = TL_SCSI_CAN_QUEUE, .this_id = -1, .sg_tablesize = TL_SCSI_SG_TABLESIZE, .cmd_per_lun = TL_SCSI_CMD_PER_LUN, .max_sectors = TL_SCSI_MAX_SECTORS, .use_clustering = DISABLE_CLUSTERING, .slave_alloc = tcm_loop_slave_alloc, .slave_configure = tcm_loop_slave_configure, .module = THIS_MODULE, }; static int tcm_loop_driver_probe(struct device *dev) { struct tcm_loop_hba *tl_hba; struct Scsi_Host *sh; int error; 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 = TL_SCSI_MAX_CMD_LEN; error = scsi_add_host(sh, &tl_hba->dev); if (error) { pr_err("%s: scsi_add_host failed\n", __func__); scsi_host_put(sh); return -ENODEV; } return 0; } static int 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; scsi_remove_host(sh); scsi_host_put(sh); return 0; } 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); 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 char *tcm_loop_get_fabric_name(void) { return "loopback"; } static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; /* * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() * time based on the protocol dependent prefix of the passed configfs group. * * Based upon tl_proto_id, TCM_Loop emulates the requested fabric * ProtocolID using target_core_fabric_lib.c symbols. */ switch (tl_hba->tl_proto_id) { case SCSI_PROTOCOL_SAS: return sas_get_fabric_proto_ident(se_tpg); case SCSI_PROTOCOL_FCP: return fc_get_fabric_proto_ident(se_tpg); case SCSI_PROTOCOL_ISCSI: return iscsi_get_fabric_proto_ident(se_tpg); default: pr_err("Unknown tl_proto_id: 0x%02x, using" " SAS emulation\n", tl_hba->tl_proto_id); break; } return sas_get_fabric_proto_ident(se_tpg); } static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; /* * Return the passed NAA identifier for the SAS Target Port */ return &tl_tpg->tl_hba->tl_wwn_address[0]; } static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; /* * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 * to represent the SCSI Target Port. */ return tl_tpg->tl_tpgt; } static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) { return 1; } static u32 tcm_loop_get_pr_transport_id( struct se_portal_group *se_tpg, struct se_node_acl *se_nacl, struct t10_pr_registration *pr_reg, int *format_code, unsigned char *buf) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; switch (tl_hba->tl_proto_id) { case SCSI_PROTOCOL_SAS: return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, format_code, buf); case SCSI_PROTOCOL_FCP: return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, format_code, buf); case SCSI_PROTOCOL_ISCSI: return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, format_code, buf); default: pr_err("Unknown tl_proto_id: 0x%02x, using" " SAS emulation\n", tl_hba->tl_proto_id); break; } return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, format_code, buf); } static u32 tcm_loop_get_pr_transport_id_len( struct se_portal_group *se_tpg, struct se_node_acl *se_nacl, struct t10_pr_registration *pr_reg, int *format_code) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; switch (tl_hba->tl_proto_id) { case SCSI_PROTOCOL_SAS: return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, format_code); case SCSI_PROTOCOL_FCP: return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, format_code); case SCSI_PROTOCOL_ISCSI: return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, format_code); default: pr_err("Unknown tl_proto_id: 0x%02x, using" " SAS emulation\n", tl_hba->tl_proto_id); break; } return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, format_code); } /* * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. */ static char *tcm_loop_parse_pr_out_transport_id( struct se_portal_group *se_tpg, const char *buf, u32 *out_tid_len, char **port_nexus_ptr) { struct tcm_loop_tpg *tl_tpg = (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; switch (tl_hba->tl_proto_id) { case SCSI_PROTOCOL_SAS: return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, port_nexus_ptr); case SCSI_PROTOCOL_FCP: return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, port_nexus_ptr); case SCSI_PROTOCOL_ISCSI: return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, port_nexus_ptr); default: pr_err("Unknown tl_proto_id: 0x%02x, using" " SAS emulation\n", tl_hba->tl_proto_id); break; } return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, port_nexus_ptr); } /* * 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_demo_mode_cache(struct se_portal_group *se_tpg) { return 0; } /* * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest */ static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) { return 0; } /* * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will * never be called for TCM_Loop by target_core_fabric_configfs.c code. * It has been added here as a nop for target_fabric_tf_ops_check() */ static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) { return 0; } static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( struct se_portal_group *se_tpg) { struct tcm_loop_nacl *tl_nacl; tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); if (!tl_nacl) { pr_err("Unable to allocate struct tcm_loop_nacl\n"); return NULL; } return &tl_nacl->se_node_acl; } static void tcm_loop_tpg_release_fabric_acl( struct se_portal_group *se_tpg, struct se_node_acl *se_nacl) { struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, struct tcm_loop_nacl, se_node_acl); kfree(tl_nacl); } static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) { return 1; } static int tcm_loop_is_state_remove(struct se_cmd *se_cmd) { /* * Assume struct scsi_cmnd is not in remove state.. */ return 0; } static int tcm_loop_sess_logged_in(struct se_session *se_sess) { /* * Assume that TL Nexus is always active */ return 1; } static u32 tcm_loop_sess_get_index(struct se_session *se_sess) { return 1; } static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) { return; } static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) { 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_shutdown_session(struct se_session *se_sess) { return 0; } static void tcm_loop_close_session(struct se_session *se_sess) { return; }; static void tcm_loop_stop_session( struct se_session *se_sess, int sess_sleep, int conn_sleep) { return; } static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess) { return; } 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. */ transport_generic_process_write(se_cmd); return 0; } static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) { return 0; } static int tcm_loop_queue_data_in(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; pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" " cdb: 0x%02x\n", sc, sc->cmnd[0]); sc->result = SAM_STAT_GOOD; set_host_byte(sc, DID_OK); sc->scsi_done(sc); return 0; } static int tcm_loop_queue_status(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; pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" " cdb: 0x%02x\n", 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; set_driver_byte(sc, DRIVER_SENSE); } else sc->result = se_cmd->scsi_status; set_host_byte(sc, DID_OK); sc->scsi_done(sc); return 0; } static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) { struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; /* * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead * and wake up the wait_queue_head_t in tcm_loop_device_reset() */ atomic_set(&tl_tmr->tmr_complete, 1); wake_up(&tl_tmr->tl_tmr_wait); return 0; } static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) { return 0; } static u16 tcm_loop_get_fabric_sense_len(void) { return 0; } 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(&tl_tpg->tl_tpg_port_count); smp_mb__after_atomic_inc(); /* * 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:" "%d\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(&tl_tpg->tl_tpg_port_count); smp_mb__after_atomic_dec(); pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); } /* End items for tcm_loop_port_cit */ /* Start items for tcm_loop_nexus_cit */ static int tcm_loop_make_nexus( struct tcm_loop_tpg *tl_tpg, const char *name) { struct se_portal_group *se_tpg; struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; struct tcm_loop_nexus *tl_nexus; int ret = -ENOMEM; if (tl_tpg->tl_hba->tl_nexus) { pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); return -EEXIST; } se_tpg = &tl_tpg->tl_se_tpg; tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); if (!tl_nexus) { pr_err("Unable to allocate struct tcm_loop_nexus\n"); return -ENOMEM; } /* * Initialize the struct se_session pointer */ tl_nexus->se_sess = transport_init_session(); if (IS_ERR(tl_nexus->se_sess)) { ret = PTR_ERR(tl_nexus->se_sess); goto out; } /* * Since we are running in 'demo mode' this call with generate a * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI * Initiator port name of the passed configfs group 'name'. */ tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( se_tpg, (unsigned char *)name); if (!tl_nexus->se_sess->se_node_acl) { transport_free_session(tl_nexus->se_sess); goto out; } /* * Now, register the SAS I_T Nexus as active with the call to * transport_register_session() */ __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, tl_nexus->se_sess, tl_nexus); tl_tpg->tl_hba->tl_nexus = tl_nexus; 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; out: kfree(tl_nexus); return ret; } static int tcm_loop_drop_nexus( struct tcm_loop_tpg *tpg) { struct se_session *se_sess; struct tcm_loop_nexus *tl_nexus; struct tcm_loop_hba *tl_hba = tpg->tl_hba; tl_nexus = tpg->tl_hba->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(tl_hba), tl_nexus->se_sess->se_node_acl->initiatorname); /* * Release the SCSI I_T Nexus to the emulated SAS Target Port */ transport_deregister_session(tl_nexus->se_sess); tpg->tl_hba->tl_nexus = NULL; kfree(tl_nexus); return 0; } /* End items for tcm_loop_nexus_cit */ static ssize_t tcm_loop_tpg_show_nexus( struct se_portal_group *se_tpg, char *page) { 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_hba->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_store_nexus( struct se_portal_group *se_tpg, const char *page, size_t count) { 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; } TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); static struct configfs_attribute *tcm_loop_tpg_attrs[] = { &tcm_loop_tpg_nexus.attr, NULL, }; /* Start items for tcm_loop_naa_cit */ struct se_portal_group *tcm_loop_make_naa_tpg( struct se_wwn *wwn, struct config_group *group, 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; char *tpgt_str, *end_ptr; int ret; unsigned short int tpgt; tpgt_str = strstr(name, "tpgt_"); if (!tpgt_str) { pr_err("Unable to locate \"tpgt_#\" directory" " group\n"); return ERR_PTR(-EINVAL); } tpgt_str += 5; /* Skip ahead of "tpgt_" */ tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); if (tpgt >= TL_TPGS_PER_HBA) { pr_err("Passed tpgt: %hu 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 SAS TCM Target Endpoint */ ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, wwn, &tl_tpg->tl_se_tpg, tl_tpg, TRANSPORT_TPG_TYPE_NORMAL); if (ret < 0) return ERR_PTR(-ENOMEM); pr_debug("TCM_Loop_ConfigFS: Allocated 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); return &tl_tpg->tl_se_tpg; } 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 SAS link if present */ tcm_loop_drop_nexus(tl_tpg); /* * Deregister the tl_tpg as a emulated SAS 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 */ 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(sizeof(struct tcm_loop_hba), GFP_KERNEL); if (!tl_hba) { pr_err("Unable to allocate struct tcm_loop_hba\n"); 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) goto out; 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); } 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); int host_no = 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); pr_debug("TCM_Loop_ConfigFS: Deallocated emulated Target" " SAS Address: %s at Linux/SCSI Host ID: %d\n", config_item_name(&wwn->wwn_group.cg_item), host_no); } /* Start items for tcm_loop_cit */ static ssize_t tcm_loop_wwn_show_attr_version( struct target_fabric_configfs *tf, char *page) { return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); } TF_WWN_ATTR_RO(tcm_loop, version); static struct configfs_attribute *tcm_loop_wwn_attrs[] = { &tcm_loop_wwn_version.attr, NULL, }; /* End items for tcm_loop_cit */ static int tcm_loop_register_configfs(void) { struct target_fabric_configfs *fabric; struct config_group *tf_cg; int ret; /* * Set the TCM Loop HBA counter to zero */ tcm_loop_hba_no_cnt = 0; /* * Register the top level struct config_item_type with TCM core */ fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); if (IS_ERR(fabric)) { pr_err("tcm_loop_register_configfs() failed!\n"); return PTR_ERR(fabric); } /* * Setup the fabric API of function pointers used by target_core_mod */ fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; fabric->tf_ops.tpg_get_pr_transport_id_len = &tcm_loop_get_pr_transport_id_len; fabric->tf_ops.tpg_parse_pr_out_transport_id = &tcm_loop_parse_pr_out_transport_id; fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; fabric->tf_ops.tpg_check_demo_mode_cache = &tcm_loop_check_demo_mode_cache; fabric->tf_ops.tpg_check_demo_mode_write_protect = &tcm_loop_check_demo_mode_write_protect; fabric->tf_ops.tpg_check_prod_mode_write_protect = &tcm_loop_check_prod_mode_write_protect; /* * The TCM loopback fabric module runs in demo-mode to a local * virtual SCSI device, so fabric dependent initator ACLs are * not required. */ fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; fabric->tf_ops.tpg_release_fabric_acl = &tcm_loop_tpg_release_fabric_acl; fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; /* * Used for setting up remaining TCM resources in process context */ fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map; fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; fabric->tf_ops.close_session = &tcm_loop_close_session; fabric->tf_ops.stop_session = &tcm_loop_stop_session; fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0; fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in; fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; fabric->tf_ops.sess_get_initiator_sid = NULL; fabric->tf_ops.write_pending = &tcm_loop_write_pending; fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; /* * Not used for TCM loopback */ fabric->tf_ops.set_default_node_attributes = &tcm_loop_set_default_node_attributes; fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; fabric->tf_ops.queue_status = &tcm_loop_queue_status; fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove; tf_cg = &fabric->tf_group; /* * Setup function pointers for generic logic in target_core_fabric_configfs.c */ fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; /* * fabric_post_link() and fabric_pre_unlink() are used for * registration and release of TCM Loop Virtual SCSI LUNs. */ fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; fabric->tf_ops.fabric_make_np = NULL; fabric->tf_ops.fabric_drop_np = NULL; /* * Setup default attribute lists for various fabric->tf_cit_tmpl */ TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; /* * Once fabric->tf_ops has been setup, now register the fabric for * use within TCM */ ret = target_fabric_configfs_register(fabric); if (ret < 0) { pr_err("target_fabric_configfs_register() for" " TCM_Loop failed!\n"); target_fabric_configfs_free(fabric); return -1; } /* * Setup our local pointer to *fabric. */ tcm_loop_fabric_configfs = fabric; pr_debug("TCM_LOOP[0] - Set fabric ->" " tcm_loop_fabric_configfs\n"); return 0; } static void tcm_loop_deregister_configfs(void) { if (!tcm_loop_fabric_configfs) return; target_fabric_configfs_deregister(tcm_loop_fabric_configfs); tcm_loop_fabric_configfs = NULL; pr_debug("TCM_LOOP[0] - Cleared" " tcm_loop_fabric_configfs\n"); } static int __init tcm_loop_fabric_init(void) { int ret; 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"); return -ENOMEM; } ret = tcm_loop_alloc_core_bus(); if (ret) return ret; ret = tcm_loop_register_configfs(); if (ret) { tcm_loop_release_core_bus(); return ret; } return 0; } static void __exit tcm_loop_fabric_exit(void) { tcm_loop_deregister_configfs(); 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 "); MODULE_LICENSE("GPL"); module_init(tcm_loop_fabric_init); module_exit(tcm_loop_fabric_exit);