1 /*******************************************************************************
3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
4 * for emulated SAS initiator ports
6 * © Copyright 2011 RisingTide Systems LLC.
8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
10 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 ****************************************************************************/
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/types.h>
28 #include <linux/configfs.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_cmnd.h>
35 #include <target/target_core_base.h>
36 #include <target/target_core_transport.h>
37 #include <target/target_core_fabric_ops.h>
38 #include <target/target_core_fabric_configfs.h>
39 #include <target/target_core_fabric_lib.h>
40 #include <target/target_core_configfs.h>
41 #include <target/target_core_device.h>
42 #include <target/target_core_tpg.h>
43 #include <target/target_core_tmr.h>
47 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
49 /* Local pointer to allocated TCM configfs fabric module */
50 static struct target_fabric_configfs *tcm_loop_fabric_configfs;
52 static struct kmem_cache *tcm_loop_cmd_cache;
54 static int tcm_loop_hba_no_cnt;
57 * Allocate a tcm_loop cmd descriptor from target_core_mod code
59 * Can be called from interrupt context in tcm_loop_queuecommand() below
61 static struct se_cmd *tcm_loop_allocate_core_cmd(
62 struct tcm_loop_hba *tl_hba,
63 struct se_portal_group *se_tpg,
66 struct se_cmd *se_cmd;
67 struct se_session *se_sess;
68 struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
69 struct tcm_loop_cmd *tl_cmd;
73 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
75 set_host_byte(sc, DID_ERROR);
78 se_sess = tl_nexus->se_sess;
80 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
82 pr_err("Unable to allocate struct tcm_loop_cmd\n");
83 set_host_byte(sc, DID_ERROR);
86 se_cmd = &tl_cmd->tl_se_cmd;
88 * Save the pointer to struct scsi_cmnd *sc
92 * Locate the SAM Task Attr from struct scsi_cmnd *
94 if (sc->device->tagged_supported) {
96 case HEAD_OF_QUEUE_TAG:
97 sam_task_attr = MSG_HEAD_TAG;
99 case ORDERED_QUEUE_TAG:
100 sam_task_attr = MSG_ORDERED_TAG;
103 sam_task_attr = MSG_SIMPLE_TAG;
107 sam_task_attr = MSG_SIMPLE_TAG;
110 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
112 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
113 scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
114 &tl_cmd->tl_sense_buf[0]);
116 if (scsi_bidi_cmnd(sc))
117 se_cmd->se_cmd_flags |= SCF_BIDI;
120 * Locate the struct se_lun pointer and attach it to struct se_cmd
122 if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) {
123 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
124 set_host_byte(sc, DID_NO_CONNECT);
132 * Called by struct target_core_fabric_ops->new_cmd_map()
134 * Always called in process context. A non zero return value
135 * here will signal to handle an exception based on the return code.
137 static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
139 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
140 struct tcm_loop_cmd, tl_se_cmd);
141 struct scsi_cmnd *sc = tl_cmd->sc;
142 struct scatterlist *sgl_bidi = NULL;
143 u32 sgl_bidi_count = 0;
146 * Allocate the necessary tasks to complete the received CDB+data
148 ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd);
152 * For BIDI commands, pass in the extra READ buffer
153 * to transport_generic_map_mem_to_cmd() below..
155 if (se_cmd->se_cmd_flags & SCF_BIDI) {
156 struct scsi_data_buffer *sdb = scsi_in(sc);
158 sgl_bidi = sdb->table.sgl;
159 sgl_bidi_count = sdb->table.nents;
162 * Because some userspace code via scsi-generic do not memset their
163 * associated read buffers, go ahead and do that here for type
164 * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently
165 * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB
166 * by target core in transport_generic_allocate_tasks() ->
167 * transport_generic_cmd_sequencer().
169 if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB &&
170 se_cmd->data_direction == DMA_FROM_DEVICE) {
171 struct scatterlist *sg = scsi_sglist(sc);
172 unsigned char *buf = kmap(sg_page(sg)) + sg->offset;
175 memset(buf, 0, sg->length);
180 /* Tell the core about our preallocated memory */
181 return transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
182 scsi_sg_count(sc), sgl_bidi, sgl_bidi_count);
186 * Called from struct target_core_fabric_ops->check_stop_free()
188 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
191 * Do not release struct se_cmd's containing a valid TMR
192 * pointer. These will be released directly in tcm_loop_device_reset()
193 * with transport_generic_free_cmd().
195 if (se_cmd->se_tmr_req)
198 * Release the struct se_cmd, which will make a callback to release
199 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
201 transport_generic_free_cmd(se_cmd, 0);
205 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
207 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
208 struct tcm_loop_cmd, tl_se_cmd);
210 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
213 static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
214 char **start, off_t offset,
215 int length, int inout)
217 return sprintf(buffer, "tcm_loop_proc_info()\n");
220 static int tcm_loop_driver_probe(struct device *);
221 static int tcm_loop_driver_remove(struct device *);
223 static int pseudo_lld_bus_match(struct device *dev,
224 struct device_driver *dev_driver)
229 static struct bus_type tcm_loop_lld_bus = {
230 .name = "tcm_loop_bus",
231 .match = pseudo_lld_bus_match,
232 .probe = tcm_loop_driver_probe,
233 .remove = tcm_loop_driver_remove,
236 static struct device_driver tcm_loop_driverfs = {
238 .bus = &tcm_loop_lld_bus,
241 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
243 struct device *tcm_loop_primary;
246 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
247 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
249 static int tcm_loop_change_queue_depth(
250 struct scsi_device *sdev,
255 case SCSI_QDEPTH_DEFAULT:
256 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
258 case SCSI_QDEPTH_QFULL:
259 scsi_track_queue_full(sdev, depth);
261 case SCSI_QDEPTH_RAMP_UP:
262 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
267 return sdev->queue_depth;
271 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
272 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
274 static int tcm_loop_queuecommand(
275 struct Scsi_Host *sh,
276 struct scsi_cmnd *sc)
278 struct se_cmd *se_cmd;
279 struct se_portal_group *se_tpg;
280 struct tcm_loop_hba *tl_hba;
281 struct tcm_loop_tpg *tl_tpg;
283 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
284 " scsi_buf_len: %u\n", sc->device->host->host_no,
285 sc->device->id, sc->device->channel, sc->device->lun,
286 sc->cmnd[0], scsi_bufflen(sc));
288 * Locate the tcm_loop_hba_t pointer
290 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
291 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
293 * Ensure that this tl_tpg reference from the incoming sc->device->id
294 * has already been configured via tcm_loop_make_naa_tpg().
296 if (!tl_tpg->tl_hba) {
297 set_host_byte(sc, DID_NO_CONNECT);
301 se_tpg = &tl_tpg->tl_se_tpg;
303 * Determine the SAM Task Attribute and allocate tl_cmd and
304 * tl_cmd->tl_se_cmd from TCM infrastructure
306 se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
312 * Queue up the newly allocated to be processed in TCM thread context.
314 transport_generic_handle_cdb_map(se_cmd);
319 * Called from SCSI EH process context to issue a LUN_RESET TMR
320 * to struct scsi_device
322 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
324 struct se_cmd *se_cmd = NULL;
325 struct se_portal_group *se_tpg;
326 struct se_session *se_sess;
327 struct tcm_loop_cmd *tl_cmd = NULL;
328 struct tcm_loop_hba *tl_hba;
329 struct tcm_loop_nexus *tl_nexus;
330 struct tcm_loop_tmr *tl_tmr = NULL;
331 struct tcm_loop_tpg *tl_tpg;
334 * Locate the tcm_loop_hba_t pointer
336 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
338 * Locate the tl_nexus and se_sess pointers
340 tl_nexus = tl_hba->tl_nexus;
342 pr_err("Unable to perform device reset without"
343 " active I_T Nexus\n");
346 se_sess = tl_nexus->se_sess;
348 * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
350 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
351 se_tpg = &tl_tpg->tl_se_tpg;
353 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
355 pr_err("Unable to allocate memory for tl_cmd\n");
359 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
361 pr_err("Unable to allocate memory for tl_tmr\n");
364 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
366 se_cmd = &tl_cmd->tl_se_cmd;
368 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
370 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
371 DMA_NONE, MSG_SIMPLE_TAG,
372 &tl_cmd->tl_sense_buf[0]);
374 * Allocate the LUN_RESET TMR
376 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr,
377 TMR_LUN_RESET, GFP_KERNEL);
378 if (IS_ERR(se_cmd->se_tmr_req))
381 * Locate the underlying TCM struct se_lun from sc->device->lun
383 if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0)
386 * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
389 transport_generic_handle_tmr(se_cmd);
390 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
392 * The TMR LUN_RESET has completed, check the response status and
393 * then release allocations.
395 ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
399 transport_generic_free_cmd(se_cmd, 1);
401 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
406 static int tcm_loop_slave_alloc(struct scsi_device *sd)
408 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
412 static int tcm_loop_slave_configure(struct scsi_device *sd)
417 static struct scsi_host_template tcm_loop_driver_template = {
418 .proc_info = tcm_loop_proc_info,
419 .proc_name = "tcm_loopback",
420 .name = "TCM_Loopback",
421 .queuecommand = tcm_loop_queuecommand,
422 .change_queue_depth = tcm_loop_change_queue_depth,
423 .eh_device_reset_handler = tcm_loop_device_reset,
424 .can_queue = TL_SCSI_CAN_QUEUE,
426 .sg_tablesize = TL_SCSI_SG_TABLESIZE,
427 .cmd_per_lun = TL_SCSI_CMD_PER_LUN,
428 .max_sectors = TL_SCSI_MAX_SECTORS,
429 .use_clustering = DISABLE_CLUSTERING,
430 .slave_alloc = tcm_loop_slave_alloc,
431 .slave_configure = tcm_loop_slave_configure,
432 .module = THIS_MODULE,
435 static int tcm_loop_driver_probe(struct device *dev)
437 struct tcm_loop_hba *tl_hba;
438 struct Scsi_Host *sh;
441 tl_hba = to_tcm_loop_hba(dev);
443 sh = scsi_host_alloc(&tcm_loop_driver_template,
444 sizeof(struct tcm_loop_hba));
446 pr_err("Unable to allocate struct scsi_host\n");
452 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
454 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
456 * Setup single ID, Channel and LUN for now..
461 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
463 error = scsi_add_host(sh, &tl_hba->dev);
465 pr_err("%s: scsi_add_host failed\n", __func__);
472 static int tcm_loop_driver_remove(struct device *dev)
474 struct tcm_loop_hba *tl_hba;
475 struct Scsi_Host *sh;
477 tl_hba = to_tcm_loop_hba(dev);
480 scsi_remove_host(sh);
485 static void tcm_loop_release_adapter(struct device *dev)
487 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
493 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
495 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
499 tl_hba->dev.bus = &tcm_loop_lld_bus;
500 tl_hba->dev.parent = tcm_loop_primary;
501 tl_hba->dev.release = &tcm_loop_release_adapter;
502 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
504 ret = device_register(&tl_hba->dev);
506 pr_err("device_register() failed for"
507 " tl_hba->dev: %d\n", ret);
515 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
518 static int tcm_loop_alloc_core_bus(void)
522 tcm_loop_primary = root_device_register("tcm_loop_0");
523 if (IS_ERR(tcm_loop_primary)) {
524 pr_err("Unable to allocate tcm_loop_primary\n");
525 return PTR_ERR(tcm_loop_primary);
528 ret = bus_register(&tcm_loop_lld_bus);
530 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
534 ret = driver_register(&tcm_loop_driverfs);
536 pr_err("driver_register() failed for"
537 "tcm_loop_driverfs\n");
541 pr_debug("Initialized TCM Loop Core Bus\n");
545 bus_unregister(&tcm_loop_lld_bus);
547 root_device_unregister(tcm_loop_primary);
551 static void tcm_loop_release_core_bus(void)
553 driver_unregister(&tcm_loop_driverfs);
554 bus_unregister(&tcm_loop_lld_bus);
555 root_device_unregister(tcm_loop_primary);
557 pr_debug("Releasing TCM Loop Core BUS\n");
560 static char *tcm_loop_get_fabric_name(void)
565 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
567 struct tcm_loop_tpg *tl_tpg =
568 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
569 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
571 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
572 * time based on the protocol dependent prefix of the passed configfs group.
574 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
575 * ProtocolID using target_core_fabric_lib.c symbols.
577 switch (tl_hba->tl_proto_id) {
578 case SCSI_PROTOCOL_SAS:
579 return sas_get_fabric_proto_ident(se_tpg);
580 case SCSI_PROTOCOL_FCP:
581 return fc_get_fabric_proto_ident(se_tpg);
582 case SCSI_PROTOCOL_ISCSI:
583 return iscsi_get_fabric_proto_ident(se_tpg);
585 pr_err("Unknown tl_proto_id: 0x%02x, using"
586 " SAS emulation\n", tl_hba->tl_proto_id);
590 return sas_get_fabric_proto_ident(se_tpg);
593 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
595 struct tcm_loop_tpg *tl_tpg =
596 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
598 * Return the passed NAA identifier for the SAS Target Port
600 return &tl_tpg->tl_hba->tl_wwn_address[0];
603 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
605 struct tcm_loop_tpg *tl_tpg =
606 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
608 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
609 * to represent the SCSI Target Port.
611 return tl_tpg->tl_tpgt;
614 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
619 static u32 tcm_loop_get_pr_transport_id(
620 struct se_portal_group *se_tpg,
621 struct se_node_acl *se_nacl,
622 struct t10_pr_registration *pr_reg,
626 struct tcm_loop_tpg *tl_tpg =
627 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
628 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
630 switch (tl_hba->tl_proto_id) {
631 case SCSI_PROTOCOL_SAS:
632 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
634 case SCSI_PROTOCOL_FCP:
635 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
637 case SCSI_PROTOCOL_ISCSI:
638 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
641 pr_err("Unknown tl_proto_id: 0x%02x, using"
642 " SAS emulation\n", tl_hba->tl_proto_id);
646 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
650 static u32 tcm_loop_get_pr_transport_id_len(
651 struct se_portal_group *se_tpg,
652 struct se_node_acl *se_nacl,
653 struct t10_pr_registration *pr_reg,
656 struct tcm_loop_tpg *tl_tpg =
657 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
658 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
660 switch (tl_hba->tl_proto_id) {
661 case SCSI_PROTOCOL_SAS:
662 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
664 case SCSI_PROTOCOL_FCP:
665 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
667 case SCSI_PROTOCOL_ISCSI:
668 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
671 pr_err("Unknown tl_proto_id: 0x%02x, using"
672 " SAS emulation\n", tl_hba->tl_proto_id);
676 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
681 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
682 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
684 static char *tcm_loop_parse_pr_out_transport_id(
685 struct se_portal_group *se_tpg,
688 char **port_nexus_ptr)
690 struct tcm_loop_tpg *tl_tpg =
691 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
692 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
694 switch (tl_hba->tl_proto_id) {
695 case SCSI_PROTOCOL_SAS:
696 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
698 case SCSI_PROTOCOL_FCP:
699 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
701 case SCSI_PROTOCOL_ISCSI:
702 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
705 pr_err("Unknown tl_proto_id: 0x%02x, using"
706 " SAS emulation\n", tl_hba->tl_proto_id);
710 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
715 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
716 * based upon the incoming fabric dependent SCSI Initiator Port
718 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
723 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
729 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
730 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
732 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
738 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
739 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
740 * It has been added here as a nop for target_fabric_tf_ops_check()
742 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
747 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
748 struct se_portal_group *se_tpg)
750 struct tcm_loop_nacl *tl_nacl;
752 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
754 pr_err("Unable to allocate struct tcm_loop_nacl\n");
758 return &tl_nacl->se_node_acl;
761 static void tcm_loop_tpg_release_fabric_acl(
762 struct se_portal_group *se_tpg,
763 struct se_node_acl *se_nacl)
765 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
766 struct tcm_loop_nacl, se_node_acl);
771 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
776 static int tcm_loop_is_state_remove(struct se_cmd *se_cmd)
779 * Assume struct scsi_cmnd is not in remove state..
784 static int tcm_loop_sess_logged_in(struct se_session *se_sess)
787 * Assume that TL Nexus is always active
792 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
797 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
802 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
807 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
809 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
810 struct tcm_loop_cmd, tl_se_cmd);
812 return tl_cmd->sc_cmd_state;
815 static int tcm_loop_shutdown_session(struct se_session *se_sess)
820 static void tcm_loop_close_session(struct se_session *se_sess)
825 static void tcm_loop_stop_session(
826 struct se_session *se_sess,
833 static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess)
838 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
841 * Since Linux/SCSI has already sent down a struct scsi_cmnd
842 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
843 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
844 * format with transport_generic_map_mem_to_cmd().
846 * We now tell TCM to add this WRITE CDB directly into the TCM storage
847 * object execution queue.
849 transport_generic_process_write(se_cmd);
853 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
858 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
860 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
861 struct tcm_loop_cmd, tl_se_cmd);
862 struct scsi_cmnd *sc = tl_cmd->sc;
864 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
865 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
867 sc->result = SAM_STAT_GOOD;
868 set_host_byte(sc, DID_OK);
869 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
870 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
871 scsi_set_resid(sc, se_cmd->residual_count);
876 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
878 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
879 struct tcm_loop_cmd, tl_se_cmd);
880 struct scsi_cmnd *sc = tl_cmd->sc;
882 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
883 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
885 if (se_cmd->sense_buffer &&
886 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
887 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
889 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
890 SCSI_SENSE_BUFFERSIZE);
891 sc->result = SAM_STAT_CHECK_CONDITION;
892 set_driver_byte(sc, DRIVER_SENSE);
894 sc->result = se_cmd->scsi_status;
896 set_host_byte(sc, DID_OK);
897 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
898 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
899 scsi_set_resid(sc, se_cmd->residual_count);
904 static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
906 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
907 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
909 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
910 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
912 atomic_set(&tl_tmr->tmr_complete, 1);
913 wake_up(&tl_tmr->tl_tmr_wait);
917 static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
922 static u16 tcm_loop_get_fabric_sense_len(void)
927 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
929 switch (tl_hba->tl_proto_id) {
930 case SCSI_PROTOCOL_SAS:
932 case SCSI_PROTOCOL_FCP:
934 case SCSI_PROTOCOL_ISCSI:
943 /* Start items for tcm_loop_port_cit */
945 static int tcm_loop_port_link(
946 struct se_portal_group *se_tpg,
949 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
950 struct tcm_loop_tpg, tl_se_tpg);
951 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
953 atomic_inc(&tl_tpg->tl_tpg_port_count);
954 smp_mb__after_atomic_inc();
956 * Add Linux/SCSI struct scsi_device by HCTL
958 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
960 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
964 static void tcm_loop_port_unlink(
965 struct se_portal_group *se_tpg,
966 struct se_lun *se_lun)
968 struct scsi_device *sd;
969 struct tcm_loop_hba *tl_hba;
970 struct tcm_loop_tpg *tl_tpg;
972 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
973 tl_hba = tl_tpg->tl_hba;
975 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
976 se_lun->unpacked_lun);
978 pr_err("Unable to locate struct scsi_device for %d:%d:"
979 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
983 * Remove Linux/SCSI struct scsi_device by HCTL
985 scsi_remove_device(sd);
988 atomic_dec(&tl_tpg->tl_tpg_port_count);
989 smp_mb__after_atomic_dec();
991 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
994 /* End items for tcm_loop_port_cit */
996 /* Start items for tcm_loop_nexus_cit */
998 static int tcm_loop_make_nexus(
999 struct tcm_loop_tpg *tl_tpg,
1002 struct se_portal_group *se_tpg;
1003 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1004 struct tcm_loop_nexus *tl_nexus;
1007 if (tl_tpg->tl_hba->tl_nexus) {
1008 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
1011 se_tpg = &tl_tpg->tl_se_tpg;
1013 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1015 pr_err("Unable to allocate struct tcm_loop_nexus\n");
1019 * Initialize the struct se_session pointer
1021 tl_nexus->se_sess = transport_init_session();
1022 if (IS_ERR(tl_nexus->se_sess)) {
1023 ret = PTR_ERR(tl_nexus->se_sess);
1027 * Since we are running in 'demo mode' this call with generate a
1028 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1029 * Initiator port name of the passed configfs group 'name'.
1031 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1032 se_tpg, (unsigned char *)name);
1033 if (!tl_nexus->se_sess->se_node_acl) {
1034 transport_free_session(tl_nexus->se_sess);
1038 * Now, register the SAS I_T Nexus as active with the call to
1039 * transport_register_session()
1041 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1042 tl_nexus->se_sess, tl_nexus);
1043 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1044 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1045 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1054 static int tcm_loop_drop_nexus(
1055 struct tcm_loop_tpg *tpg)
1057 struct se_session *se_sess;
1058 struct tcm_loop_nexus *tl_nexus;
1059 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1061 tl_nexus = tpg->tl_hba->tl_nexus;
1065 se_sess = tl_nexus->se_sess;
1069 if (atomic_read(&tpg->tl_tpg_port_count)) {
1070 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1071 " active TPG port count: %d\n",
1072 atomic_read(&tpg->tl_tpg_port_count));
1076 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1077 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1078 tl_nexus->se_sess->se_node_acl->initiatorname);
1080 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1082 transport_deregister_session(tl_nexus->se_sess);
1083 tpg->tl_hba->tl_nexus = NULL;
1088 /* End items for tcm_loop_nexus_cit */
1090 static ssize_t tcm_loop_tpg_show_nexus(
1091 struct se_portal_group *se_tpg,
1094 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1095 struct tcm_loop_tpg, tl_se_tpg);
1096 struct tcm_loop_nexus *tl_nexus;
1099 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1103 ret = snprintf(page, PAGE_SIZE, "%s\n",
1104 tl_nexus->se_sess->se_node_acl->initiatorname);
1109 static ssize_t tcm_loop_tpg_store_nexus(
1110 struct se_portal_group *se_tpg,
1114 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1115 struct tcm_loop_tpg, tl_se_tpg);
1116 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1117 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1120 * Shutdown the active I_T nexus if 'NULL' is passed..
1122 if (!strncmp(page, "NULL", 4)) {
1123 ret = tcm_loop_drop_nexus(tl_tpg);
1124 return (!ret) ? count : ret;
1127 * Otherwise make sure the passed virtual Initiator port WWN matches
1128 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1129 * tcm_loop_make_nexus()
1131 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1132 pr_err("Emulated NAA Sas Address: %s, exceeds"
1133 " max: %d\n", page, TL_WWN_ADDR_LEN);
1136 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1138 ptr = strstr(i_port, "naa.");
1140 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1141 pr_err("Passed SAS Initiator Port %s does not"
1142 " match target port protoid: %s\n", i_port,
1143 tcm_loop_dump_proto_id(tl_hba));
1146 port_ptr = &i_port[0];
1149 ptr = strstr(i_port, "fc.");
1151 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1152 pr_err("Passed FCP Initiator Port %s does not"
1153 " match target port protoid: %s\n", i_port,
1154 tcm_loop_dump_proto_id(tl_hba));
1157 port_ptr = &i_port[3]; /* Skip over "fc." */
1160 ptr = strstr(i_port, "iqn.");
1162 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1163 pr_err("Passed iSCSI Initiator Port %s does not"
1164 " match target port protoid: %s\n", i_port,
1165 tcm_loop_dump_proto_id(tl_hba));
1168 port_ptr = &i_port[0];
1171 pr_err("Unable to locate prefix for emulated Initiator Port:"
1175 * Clear any trailing newline for the NAA WWN
1178 if (i_port[strlen(i_port)-1] == '\n')
1179 i_port[strlen(i_port)-1] = '\0';
1181 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1188 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1190 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1191 &tcm_loop_tpg_nexus.attr,
1195 /* Start items for tcm_loop_naa_cit */
1197 struct se_portal_group *tcm_loop_make_naa_tpg(
1199 struct config_group *group,
1202 struct tcm_loop_hba *tl_hba = container_of(wwn,
1203 struct tcm_loop_hba, tl_hba_wwn);
1204 struct tcm_loop_tpg *tl_tpg;
1205 char *tpgt_str, *end_ptr;
1207 unsigned short int tpgt;
1209 tpgt_str = strstr(name, "tpgt_");
1211 pr_err("Unable to locate \"tpgt_#\" directory"
1213 return ERR_PTR(-EINVAL);
1215 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1216 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1218 if (tpgt >= TL_TPGS_PER_HBA) {
1219 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1220 " %u\n", tpgt, TL_TPGS_PER_HBA);
1221 return ERR_PTR(-EINVAL);
1223 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1224 tl_tpg->tl_hba = tl_hba;
1225 tl_tpg->tl_tpgt = tpgt;
1227 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1229 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1230 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1231 TRANSPORT_TPG_TYPE_NORMAL);
1233 return ERR_PTR(-ENOMEM);
1235 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1236 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1237 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1239 return &tl_tpg->tl_se_tpg;
1242 void tcm_loop_drop_naa_tpg(
1243 struct se_portal_group *se_tpg)
1245 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1246 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1247 struct tcm_loop_tpg, tl_se_tpg);
1248 struct tcm_loop_hba *tl_hba;
1249 unsigned short tpgt;
1251 tl_hba = tl_tpg->tl_hba;
1252 tpgt = tl_tpg->tl_tpgt;
1254 * Release the I_T Nexus for the Virtual SAS link if present
1256 tcm_loop_drop_nexus(tl_tpg);
1258 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1260 core_tpg_deregister(se_tpg);
1262 tl_tpg->tl_hba = NULL;
1263 tl_tpg->tl_tpgt = 0;
1265 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1266 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1267 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1270 /* End items for tcm_loop_naa_cit */
1272 /* Start items for tcm_loop_cit */
1274 struct se_wwn *tcm_loop_make_scsi_hba(
1275 struct target_fabric_configfs *tf,
1276 struct config_group *group,
1279 struct tcm_loop_hba *tl_hba;
1280 struct Scsi_Host *sh;
1284 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1286 pr_err("Unable to allocate struct tcm_loop_hba\n");
1287 return ERR_PTR(-ENOMEM);
1290 * Determine the emulated Protocol Identifier and Target Port Name
1291 * based on the incoming configfs directory name.
1293 ptr = strstr(name, "naa.");
1295 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1298 ptr = strstr(name, "fc.");
1300 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1301 off = 3; /* Skip over "fc." */
1304 ptr = strstr(name, "iqn.");
1306 pr_err("Unable to locate prefix for emulated Target "
1307 "Port: %s\n", name);
1311 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1314 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1315 pr_err("Emulated NAA %s Address: %s, exceeds"
1316 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1321 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1324 * Call device_register(tl_hba->dev) to register the emulated
1325 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1326 * device_register() callbacks in tcm_loop_driver_probe()
1328 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1333 tcm_loop_hba_no_cnt++;
1334 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1335 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1336 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1338 return &tl_hba->tl_hba_wwn;
1341 return ERR_PTR(ret);
1344 void tcm_loop_drop_scsi_hba(
1347 struct tcm_loop_hba *tl_hba = container_of(wwn,
1348 struct tcm_loop_hba, tl_hba_wwn);
1350 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1351 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1352 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1354 * Call device_unregister() on the original tl_hba->dev.
1355 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1358 device_unregister(&tl_hba->dev);
1361 /* Start items for tcm_loop_cit */
1362 static ssize_t tcm_loop_wwn_show_attr_version(
1363 struct target_fabric_configfs *tf,
1366 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1369 TF_WWN_ATTR_RO(tcm_loop, version);
1371 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1372 &tcm_loop_wwn_version.attr,
1376 /* End items for tcm_loop_cit */
1378 static int tcm_loop_register_configfs(void)
1380 struct target_fabric_configfs *fabric;
1381 struct config_group *tf_cg;
1384 * Set the TCM Loop HBA counter to zero
1386 tcm_loop_hba_no_cnt = 0;
1388 * Register the top level struct config_item_type with TCM core
1390 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1391 if (IS_ERR(fabric)) {
1392 pr_err("tcm_loop_register_configfs() failed!\n");
1393 return PTR_ERR(fabric);
1396 * Setup the fabric API of function pointers used by target_core_mod
1398 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1399 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1400 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1401 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1402 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1403 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1404 fabric->tf_ops.tpg_get_pr_transport_id_len =
1405 &tcm_loop_get_pr_transport_id_len;
1406 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1407 &tcm_loop_parse_pr_out_transport_id;
1408 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1409 fabric->tf_ops.tpg_check_demo_mode_cache =
1410 &tcm_loop_check_demo_mode_cache;
1411 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1412 &tcm_loop_check_demo_mode_write_protect;
1413 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1414 &tcm_loop_check_prod_mode_write_protect;
1416 * The TCM loopback fabric module runs in demo-mode to a local
1417 * virtual SCSI device, so fabric dependent initator ACLs are
1420 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1421 fabric->tf_ops.tpg_release_fabric_acl =
1422 &tcm_loop_tpg_release_fabric_acl;
1423 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1425 * Used for setting up remaining TCM resources in process context
1427 fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map;
1428 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1429 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1430 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1431 fabric->tf_ops.close_session = &tcm_loop_close_session;
1432 fabric->tf_ops.stop_session = &tcm_loop_stop_session;
1433 fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0;
1434 fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in;
1435 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1436 fabric->tf_ops.sess_get_initiator_sid = NULL;
1437 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1438 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1440 * Not used for TCM loopback
1442 fabric->tf_ops.set_default_node_attributes =
1443 &tcm_loop_set_default_node_attributes;
1444 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1445 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1446 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1447 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1448 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1449 fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1450 fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1451 fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove;
1453 tf_cg = &fabric->tf_group;
1455 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1457 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1458 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1459 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1460 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1462 * fabric_post_link() and fabric_pre_unlink() are used for
1463 * registration and release of TCM Loop Virtual SCSI LUNs.
1465 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1466 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1467 fabric->tf_ops.fabric_make_np = NULL;
1468 fabric->tf_ops.fabric_drop_np = NULL;
1470 * Setup default attribute lists for various fabric->tf_cit_tmpl
1472 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1473 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1474 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1475 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1476 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1478 * Once fabric->tf_ops has been setup, now register the fabric for
1481 ret = target_fabric_configfs_register(fabric);
1483 pr_err("target_fabric_configfs_register() for"
1484 " TCM_Loop failed!\n");
1485 target_fabric_configfs_free(fabric);
1489 * Setup our local pointer to *fabric.
1491 tcm_loop_fabric_configfs = fabric;
1492 pr_debug("TCM_LOOP[0] - Set fabric ->"
1493 " tcm_loop_fabric_configfs\n");
1497 static void tcm_loop_deregister_configfs(void)
1499 if (!tcm_loop_fabric_configfs)
1502 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1503 tcm_loop_fabric_configfs = NULL;
1504 pr_debug("TCM_LOOP[0] - Cleared"
1505 " tcm_loop_fabric_configfs\n");
1508 static int __init tcm_loop_fabric_init(void)
1512 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1513 sizeof(struct tcm_loop_cmd),
1514 __alignof__(struct tcm_loop_cmd),
1516 if (!tcm_loop_cmd_cache) {
1517 pr_debug("kmem_cache_create() for"
1518 " tcm_loop_cmd_cache failed\n");
1522 ret = tcm_loop_alloc_core_bus();
1526 ret = tcm_loop_register_configfs();
1528 tcm_loop_release_core_bus();
1535 static void __exit tcm_loop_fabric_exit(void)
1537 tcm_loop_deregister_configfs();
1538 tcm_loop_release_core_bus();
1539 kmem_cache_destroy(tcm_loop_cmd_cache);
1542 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1543 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1544 MODULE_LICENSE("GPL");
1545 module_init(tcm_loop_fabric_init);
1546 module_exit(tcm_loop_fabric_exit);