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 printk(KERN_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]);
117 * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
119 if (scsi_bidi_cmnd(sc))
120 T_TASK(se_cmd)->t_tasks_bidi = 1;
122 * Locate the struct se_lun pointer and attach it to struct se_cmd
124 if (transport_get_lun_for_cmd(se_cmd, NULL, tl_cmd->sc->device->lun) < 0) {
125 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
126 set_host_byte(sc, DID_NO_CONNECT);
130 transport_device_setup_cmd(se_cmd);
135 * Called by struct target_core_fabric_ops->new_cmd_map()
137 * Always called in process context. A non zero return value
138 * here will signal to handle an exception based on the return code.
140 static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
142 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
143 struct tcm_loop_cmd, tl_se_cmd);
144 struct scsi_cmnd *sc = tl_cmd->sc;
145 void *mem_ptr, *mem_bidi_ptr = NULL;
149 * Allocate the necessary tasks to complete the received CDB+data
151 ret = transport_generic_allocate_tasks(se_cmd, tl_cmd->sc->cmnd);
153 /* Out of Resources */
154 return PYX_TRANSPORT_LU_COMM_FAILURE;
155 } else if (ret == -2) {
157 * Handle case for SAM_STAT_RESERVATION_CONFLICT
159 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
160 return PYX_TRANSPORT_RESERVATION_CONFLICT;
162 * Otherwise, return SAM_STAT_CHECK_CONDITION and return
165 return PYX_TRANSPORT_USE_SENSE_REASON;
168 * Setup the struct scatterlist memory from the received
171 if (scsi_sg_count(sc)) {
172 se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM;
173 mem_ptr = (void *)scsi_sglist(sc);
175 * For BIDI commands, pass in the extra READ buffer
176 * to transport_generic_map_mem_to_cmd() below..
178 if (T_TASK(se_cmd)->t_tasks_bidi) {
179 struct scsi_data_buffer *sdb = scsi_in(sc);
181 mem_bidi_ptr = (void *)sdb->table.sgl;
182 sg_no_bidi = sdb->table.nents;
191 * Map the SG memory into struct se_mem->page linked list using the same
192 * physical memory at sg->page_link.
194 ret = transport_generic_map_mem_to_cmd(se_cmd, mem_ptr,
195 scsi_sg_count(sc), mem_bidi_ptr, sg_no_bidi);
197 return PYX_TRANSPORT_LU_COMM_FAILURE;
203 * Called from struct target_core_fabric_ops->check_stop_free()
205 static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
208 * Do not release struct se_cmd's containing a valid TMR
209 * pointer. These will be released directly in tcm_loop_device_reset()
210 * with transport_generic_free_cmd().
212 if (se_cmd->se_tmr_req)
215 * Release the struct se_cmd, which will make a callback to release
216 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
218 transport_generic_free_cmd(se_cmd, 0, 1, 0);
222 * Called from struct target_core_fabric_ops->release_cmd_to_pool()
224 static void tcm_loop_deallocate_core_cmd(struct se_cmd *se_cmd)
226 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
227 struct tcm_loop_cmd, tl_se_cmd);
229 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
232 static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
233 char **start, off_t offset,
234 int length, int inout)
236 return sprintf(buffer, "tcm_loop_proc_info()\n");
239 static int tcm_loop_driver_probe(struct device *);
240 static int tcm_loop_driver_remove(struct device *);
242 static int pseudo_lld_bus_match(struct device *dev,
243 struct device_driver *dev_driver)
248 static struct bus_type tcm_loop_lld_bus = {
249 .name = "tcm_loop_bus",
250 .match = pseudo_lld_bus_match,
251 .probe = tcm_loop_driver_probe,
252 .remove = tcm_loop_driver_remove,
255 static struct device_driver tcm_loop_driverfs = {
257 .bus = &tcm_loop_lld_bus,
260 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
262 struct device *tcm_loop_primary;
265 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
266 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
268 static int tcm_loop_change_queue_depth(
269 struct scsi_device *sdev,
274 case SCSI_QDEPTH_DEFAULT:
275 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
277 case SCSI_QDEPTH_QFULL:
278 scsi_track_queue_full(sdev, depth);
280 case SCSI_QDEPTH_RAMP_UP:
281 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
286 return sdev->queue_depth;
290 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
291 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
293 static int tcm_loop_queuecommand(
294 struct Scsi_Host *sh,
295 struct scsi_cmnd *sc)
297 struct se_cmd *se_cmd;
298 struct se_portal_group *se_tpg;
299 struct tcm_loop_hba *tl_hba;
300 struct tcm_loop_tpg *tl_tpg;
302 TL_CDB_DEBUG("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
303 " scsi_buf_len: %u\n", sc->device->host->host_no,
304 sc->device->id, sc->device->channel, sc->device->lun,
305 sc->cmnd[0], scsi_bufflen(sc));
307 * Locate the tcm_loop_hba_t pointer
309 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
310 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
311 se_tpg = &tl_tpg->tl_se_tpg;
313 * Determine the SAM Task Attribute and allocate tl_cmd and
314 * tl_cmd->tl_se_cmd from TCM infrastructure
316 se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
322 * Queue up the newly allocated to be processed in TCM thread context.
324 transport_generic_handle_cdb_map(se_cmd);
329 * Called from SCSI EH process context to issue a LUN_RESET TMR
330 * to struct scsi_device
332 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
334 struct se_cmd *se_cmd = NULL;
335 struct se_portal_group *se_tpg;
336 struct se_session *se_sess;
337 struct tcm_loop_cmd *tl_cmd = NULL;
338 struct tcm_loop_hba *tl_hba;
339 struct tcm_loop_nexus *tl_nexus;
340 struct tcm_loop_tmr *tl_tmr = NULL;
341 struct tcm_loop_tpg *tl_tpg;
344 * Locate the tcm_loop_hba_t pointer
346 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
348 * Locate the tl_nexus and se_sess pointers
350 tl_nexus = tl_hba->tl_nexus;
352 printk(KERN_ERR "Unable to perform device reset without"
353 " active I_T Nexus\n");
356 se_sess = tl_nexus->se_sess;
358 * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
360 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
361 se_tpg = &tl_tpg->tl_se_tpg;
363 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
365 printk(KERN_ERR "Unable to allocate memory for tl_cmd\n");
369 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
371 printk(KERN_ERR "Unable to allocate memory for tl_tmr\n");
374 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
376 se_cmd = &tl_cmd->tl_se_cmd;
378 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
380 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
381 DMA_NONE, MSG_SIMPLE_TAG,
382 &tl_cmd->tl_sense_buf[0]);
384 * Allocate the LUN_RESET TMR
386 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, (void *)tl_tmr,
388 if (!se_cmd->se_tmr_req)
391 * Locate the underlying TCM struct se_lun from sc->device->lun
393 if (transport_get_lun_for_tmr(se_cmd, sc->device->lun) < 0)
396 * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
399 transport_generic_handle_tmr(se_cmd);
400 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
402 * The TMR LUN_RESET has completed, check the response status and
403 * then release allocations.
405 ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
409 transport_generic_free_cmd(se_cmd, 1, 1, 0);
411 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
416 static int tcm_loop_slave_alloc(struct scsi_device *sd)
418 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
422 static int tcm_loop_slave_configure(struct scsi_device *sd)
427 static struct scsi_host_template tcm_loop_driver_template = {
428 .proc_info = tcm_loop_proc_info,
429 .proc_name = "tcm_loopback",
430 .name = "TCM_Loopback",
431 .queuecommand = tcm_loop_queuecommand,
432 .change_queue_depth = tcm_loop_change_queue_depth,
433 .eh_device_reset_handler = tcm_loop_device_reset,
434 .can_queue = TL_SCSI_CAN_QUEUE,
436 .sg_tablesize = TL_SCSI_SG_TABLESIZE,
437 .cmd_per_lun = TL_SCSI_CMD_PER_LUN,
438 .max_sectors = TL_SCSI_MAX_SECTORS,
439 .use_clustering = DISABLE_CLUSTERING,
440 .slave_alloc = tcm_loop_slave_alloc,
441 .slave_configure = tcm_loop_slave_configure,
442 .module = THIS_MODULE,
445 static int tcm_loop_driver_probe(struct device *dev)
447 struct tcm_loop_hba *tl_hba;
448 struct Scsi_Host *sh;
451 tl_hba = to_tcm_loop_hba(dev);
453 sh = scsi_host_alloc(&tcm_loop_driver_template,
454 sizeof(struct tcm_loop_hba));
456 printk(KERN_ERR "Unable to allocate struct scsi_host\n");
462 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
464 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
466 * Setup single ID, Channel and LUN for now..
471 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
473 error = scsi_add_host(sh, &tl_hba->dev);
475 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
482 static int tcm_loop_driver_remove(struct device *dev)
484 struct tcm_loop_hba *tl_hba;
485 struct Scsi_Host *sh;
487 tl_hba = to_tcm_loop_hba(dev);
490 scsi_remove_host(sh);
495 static void tcm_loop_release_adapter(struct device *dev)
497 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
503 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
505 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
509 tl_hba->dev.bus = &tcm_loop_lld_bus;
510 tl_hba->dev.parent = tcm_loop_primary;
511 tl_hba->dev.release = &tcm_loop_release_adapter;
512 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
514 ret = device_register(&tl_hba->dev);
516 printk(KERN_ERR "device_register() failed for"
517 " tl_hba->dev: %d\n", ret);
525 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
528 static int tcm_loop_alloc_core_bus(void)
532 tcm_loop_primary = root_device_register("tcm_loop_0");
533 if (IS_ERR(tcm_loop_primary)) {
534 printk(KERN_ERR "Unable to allocate tcm_loop_primary\n");
535 return PTR_ERR(tcm_loop_primary);
538 ret = bus_register(&tcm_loop_lld_bus);
540 printk(KERN_ERR "bus_register() failed for tcm_loop_lld_bus\n");
544 ret = driver_register(&tcm_loop_driverfs);
546 printk(KERN_ERR "driver_register() failed for"
547 "tcm_loop_driverfs\n");
551 printk(KERN_INFO "Initialized TCM Loop Core Bus\n");
555 bus_unregister(&tcm_loop_lld_bus);
557 root_device_unregister(tcm_loop_primary);
561 static void tcm_loop_release_core_bus(void)
563 driver_unregister(&tcm_loop_driverfs);
564 bus_unregister(&tcm_loop_lld_bus);
565 root_device_unregister(tcm_loop_primary);
567 printk(KERN_INFO "Releasing TCM Loop Core BUS\n");
570 static char *tcm_loop_get_fabric_name(void)
575 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
577 struct tcm_loop_tpg *tl_tpg =
578 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
579 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
581 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
582 * time based on the protocol dependent prefix of the passed configfs group.
584 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
585 * ProtocolID using target_core_fabric_lib.c symbols.
587 switch (tl_hba->tl_proto_id) {
588 case SCSI_PROTOCOL_SAS:
589 return sas_get_fabric_proto_ident(se_tpg);
590 case SCSI_PROTOCOL_FCP:
591 return fc_get_fabric_proto_ident(se_tpg);
592 case SCSI_PROTOCOL_ISCSI:
593 return iscsi_get_fabric_proto_ident(se_tpg);
595 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
596 " SAS emulation\n", tl_hba->tl_proto_id);
600 return sas_get_fabric_proto_ident(se_tpg);
603 static char *tcm_loop_get_endpoint_wwn(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 * Return the passed NAA identifier for the SAS Target Port
610 return &tl_tpg->tl_hba->tl_wwn_address[0];
613 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
615 struct tcm_loop_tpg *tl_tpg =
616 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
618 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
619 * to represent the SCSI Target Port.
621 return tl_tpg->tl_tpgt;
624 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
629 static u32 tcm_loop_get_pr_transport_id(
630 struct se_portal_group *se_tpg,
631 struct se_node_acl *se_nacl,
632 struct t10_pr_registration *pr_reg,
636 struct tcm_loop_tpg *tl_tpg =
637 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
638 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
640 switch (tl_hba->tl_proto_id) {
641 case SCSI_PROTOCOL_SAS:
642 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
644 case SCSI_PROTOCOL_FCP:
645 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
647 case SCSI_PROTOCOL_ISCSI:
648 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
651 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
652 " SAS emulation\n", tl_hba->tl_proto_id);
656 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
660 static u32 tcm_loop_get_pr_transport_id_len(
661 struct se_portal_group *se_tpg,
662 struct se_node_acl *se_nacl,
663 struct t10_pr_registration *pr_reg,
666 struct tcm_loop_tpg *tl_tpg =
667 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
668 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
670 switch (tl_hba->tl_proto_id) {
671 case SCSI_PROTOCOL_SAS:
672 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
674 case SCSI_PROTOCOL_FCP:
675 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
677 case SCSI_PROTOCOL_ISCSI:
678 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
681 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
682 " SAS emulation\n", tl_hba->tl_proto_id);
686 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
691 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
692 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
694 static char *tcm_loop_parse_pr_out_transport_id(
695 struct se_portal_group *se_tpg,
698 char **port_nexus_ptr)
700 struct tcm_loop_tpg *tl_tpg =
701 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
702 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
704 switch (tl_hba->tl_proto_id) {
705 case SCSI_PROTOCOL_SAS:
706 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
708 case SCSI_PROTOCOL_FCP:
709 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
711 case SCSI_PROTOCOL_ISCSI:
712 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
715 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
716 " SAS emulation\n", tl_hba->tl_proto_id);
720 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
725 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
726 * based upon the incoming fabric dependent SCSI Initiator Port
728 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
733 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
739 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
740 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
742 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
748 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
749 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
750 * It has been added here as a nop for target_fabric_tf_ops_check()
752 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
757 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
758 struct se_portal_group *se_tpg)
760 struct tcm_loop_nacl *tl_nacl;
762 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
764 printk(KERN_ERR "Unable to allocate struct tcm_loop_nacl\n");
768 return &tl_nacl->se_node_acl;
771 static void tcm_loop_tpg_release_fabric_acl(
772 struct se_portal_group *se_tpg,
773 struct se_node_acl *se_nacl)
775 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
776 struct tcm_loop_nacl, se_node_acl);
781 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
786 static void tcm_loop_new_cmd_failure(struct se_cmd *se_cmd)
789 * Since TCM_loop is already passing struct scatterlist data from
790 * struct scsi_cmnd, no more Linux/SCSI failure dependent state need
791 * to be handled here.
796 static int tcm_loop_is_state_remove(struct se_cmd *se_cmd)
799 * Assume struct scsi_cmnd is not in remove state..
804 static int tcm_loop_sess_logged_in(struct se_session *se_sess)
807 * Assume that TL Nexus is always active
812 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
817 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
822 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
827 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
829 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
830 struct tcm_loop_cmd, tl_se_cmd);
832 return tl_cmd->sc_cmd_state;
835 static int tcm_loop_shutdown_session(struct se_session *se_sess)
840 static void tcm_loop_close_session(struct se_session *se_sess)
845 static void tcm_loop_stop_session(
846 struct se_session *se_sess,
853 static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess)
858 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
861 * Since Linux/SCSI has already sent down a struct scsi_cmnd
862 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
863 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
864 * format with transport_generic_map_mem_to_cmd().
866 * We now tell TCM to add this WRITE CDB directly into the TCM storage
867 * object execution queue.
869 transport_generic_process_write(se_cmd);
873 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
878 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
880 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
881 struct tcm_loop_cmd, tl_se_cmd);
882 struct scsi_cmnd *sc = tl_cmd->sc;
884 TL_CDB_DEBUG("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
885 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
887 sc->result = SAM_STAT_GOOD;
888 set_host_byte(sc, DID_OK);
893 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
895 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
896 struct tcm_loop_cmd, tl_se_cmd);
897 struct scsi_cmnd *sc = tl_cmd->sc;
899 TL_CDB_DEBUG("tcm_loop_queue_status() called for scsi_cmnd: %p"
900 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
902 if (se_cmd->sense_buffer &&
903 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
904 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
906 memcpy((void *)sc->sense_buffer, (void *)se_cmd->sense_buffer,
907 SCSI_SENSE_BUFFERSIZE);
908 sc->result = SAM_STAT_CHECK_CONDITION;
909 set_driver_byte(sc, DRIVER_SENSE);
911 sc->result = se_cmd->scsi_status;
913 set_host_byte(sc, DID_OK);
918 static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
920 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
921 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
923 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
924 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
926 atomic_set(&tl_tmr->tmr_complete, 1);
927 wake_up(&tl_tmr->tl_tmr_wait);
931 static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
936 static u16 tcm_loop_get_fabric_sense_len(void)
941 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
943 switch (tl_hba->tl_proto_id) {
944 case SCSI_PROTOCOL_SAS:
946 case SCSI_PROTOCOL_FCP:
948 case SCSI_PROTOCOL_ISCSI:
957 /* Start items for tcm_loop_port_cit */
959 static int tcm_loop_port_link(
960 struct se_portal_group *se_tpg,
963 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
964 struct tcm_loop_tpg, tl_se_tpg);
965 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
967 atomic_inc(&tl_tpg->tl_tpg_port_count);
968 smp_mb__after_atomic_inc();
970 * Add Linux/SCSI struct scsi_device by HCTL
972 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
974 printk(KERN_INFO "TCM_Loop_ConfigFS: Port Link Successful\n");
978 static void tcm_loop_port_unlink(
979 struct se_portal_group *se_tpg,
980 struct se_lun *se_lun)
982 struct scsi_device *sd;
983 struct tcm_loop_hba *tl_hba;
984 struct tcm_loop_tpg *tl_tpg;
986 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
987 tl_hba = tl_tpg->tl_hba;
989 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
990 se_lun->unpacked_lun);
992 printk(KERN_ERR "Unable to locate struct scsi_device for %d:%d:"
993 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
997 * Remove Linux/SCSI struct scsi_device by HCTL
999 scsi_remove_device(sd);
1000 scsi_device_put(sd);
1002 atomic_dec(&tl_tpg->tl_tpg_port_count);
1003 smp_mb__after_atomic_dec();
1005 printk(KERN_INFO "TCM_Loop_ConfigFS: Port Unlink Successful\n");
1008 /* End items for tcm_loop_port_cit */
1010 /* Start items for tcm_loop_nexus_cit */
1012 static int tcm_loop_make_nexus(
1013 struct tcm_loop_tpg *tl_tpg,
1016 struct se_portal_group *se_tpg;
1017 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1018 struct tcm_loop_nexus *tl_nexus;
1020 if (tl_tpg->tl_hba->tl_nexus) {
1021 printk(KERN_INFO "tl_tpg->tl_hba->tl_nexus already exists\n");
1024 se_tpg = &tl_tpg->tl_se_tpg;
1026 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1028 printk(KERN_ERR "Unable to allocate struct tcm_loop_nexus\n");
1032 * Initialize the struct se_session pointer
1034 tl_nexus->se_sess = transport_init_session();
1035 if (!tl_nexus->se_sess)
1038 * Since we are running in 'demo mode' this call with generate a
1039 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1040 * Initiator port name of the passed configfs group 'name'.
1042 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1043 se_tpg, (unsigned char *)name);
1044 if (!tl_nexus->se_sess->se_node_acl) {
1045 transport_free_session(tl_nexus->se_sess);
1049 * Now, register the SAS I_T Nexus as active with the call to
1050 * transport_register_session()
1052 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1053 tl_nexus->se_sess, (void *)tl_nexus);
1054 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1055 printk(KERN_INFO "TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1056 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1065 static int tcm_loop_drop_nexus(
1066 struct tcm_loop_tpg *tpg)
1068 struct se_session *se_sess;
1069 struct tcm_loop_nexus *tl_nexus;
1070 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1072 tl_nexus = tpg->tl_hba->tl_nexus;
1076 se_sess = tl_nexus->se_sess;
1080 if (atomic_read(&tpg->tl_tpg_port_count)) {
1081 printk(KERN_ERR "Unable to remove TCM_Loop I_T Nexus with"
1082 " active TPG port count: %d\n",
1083 atomic_read(&tpg->tl_tpg_port_count));
1087 printk(KERN_INFO "TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1088 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1089 tl_nexus->se_sess->se_node_acl->initiatorname);
1091 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1093 transport_deregister_session(tl_nexus->se_sess);
1094 tpg->tl_hba->tl_nexus = NULL;
1099 /* End items for tcm_loop_nexus_cit */
1101 static ssize_t tcm_loop_tpg_show_nexus(
1102 struct se_portal_group *se_tpg,
1105 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1106 struct tcm_loop_tpg, tl_se_tpg);
1107 struct tcm_loop_nexus *tl_nexus;
1110 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1114 ret = snprintf(page, PAGE_SIZE, "%s\n",
1115 tl_nexus->se_sess->se_node_acl->initiatorname);
1120 static ssize_t tcm_loop_tpg_store_nexus(
1121 struct se_portal_group *se_tpg,
1125 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1126 struct tcm_loop_tpg, tl_se_tpg);
1127 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1128 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1131 * Shutdown the active I_T nexus if 'NULL' is passed..
1133 if (!strncmp(page, "NULL", 4)) {
1134 ret = tcm_loop_drop_nexus(tl_tpg);
1135 return (!ret) ? count : ret;
1138 * Otherwise make sure the passed virtual Initiator port WWN matches
1139 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1140 * tcm_loop_make_nexus()
1142 if (strlen(page) > TL_WWN_ADDR_LEN) {
1143 printk(KERN_ERR "Emulated NAA Sas Address: %s, exceeds"
1144 " max: %d\n", page, TL_WWN_ADDR_LEN);
1147 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1149 ptr = strstr(i_port, "naa.");
1151 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1152 printk(KERN_ERR "Passed SAS 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[0];
1160 ptr = strstr(i_port, "fc.");
1162 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1163 printk(KERN_ERR "Passed FCP 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[3]; /* Skip over "fc." */
1171 ptr = strstr(i_port, "iqn.");
1173 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1174 printk(KERN_ERR "Passed iSCSI Initiator Port %s does not"
1175 " match target port protoid: %s\n", i_port,
1176 tcm_loop_dump_proto_id(tl_hba));
1179 port_ptr = &i_port[0];
1182 printk(KERN_ERR "Unable to locate prefix for emulated Initiator Port:"
1186 * Clear any trailing newline for the NAA WWN
1189 if (i_port[strlen(i_port)-1] == '\n')
1190 i_port[strlen(i_port)-1] = '\0';
1192 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1199 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1201 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1202 &tcm_loop_tpg_nexus.attr,
1206 /* Start items for tcm_loop_naa_cit */
1208 struct se_portal_group *tcm_loop_make_naa_tpg(
1210 struct config_group *group,
1213 struct tcm_loop_hba *tl_hba = container_of(wwn,
1214 struct tcm_loop_hba, tl_hba_wwn);
1215 struct tcm_loop_tpg *tl_tpg;
1216 char *tpgt_str, *end_ptr;
1218 unsigned short int tpgt;
1220 tpgt_str = strstr(name, "tpgt_");
1222 printk(KERN_ERR "Unable to locate \"tpgt_#\" directory"
1224 return ERR_PTR(-EINVAL);
1226 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1227 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1229 if (tpgt > TL_TPGS_PER_HBA) {
1230 printk(KERN_ERR "Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1231 " %u\n", tpgt, TL_TPGS_PER_HBA);
1232 return ERR_PTR(-EINVAL);
1234 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1235 tl_tpg->tl_hba = tl_hba;
1236 tl_tpg->tl_tpgt = tpgt;
1238 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1240 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1241 wwn, &tl_tpg->tl_se_tpg, (void *)tl_tpg,
1242 TRANSPORT_TPG_TYPE_NORMAL);
1244 return ERR_PTR(-ENOMEM);
1246 printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated Emulated %s"
1247 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1248 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1250 return &tl_tpg->tl_se_tpg;
1253 void tcm_loop_drop_naa_tpg(
1254 struct se_portal_group *se_tpg)
1256 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1257 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1258 struct tcm_loop_tpg, tl_se_tpg);
1259 struct tcm_loop_hba *tl_hba;
1260 unsigned short tpgt;
1262 tl_hba = tl_tpg->tl_hba;
1263 tpgt = tl_tpg->tl_tpgt;
1265 * Release the I_T Nexus for the Virtual SAS link if present
1267 tcm_loop_drop_nexus(tl_tpg);
1269 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1271 core_tpg_deregister(se_tpg);
1273 printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated Emulated %s"
1274 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1275 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1278 /* End items for tcm_loop_naa_cit */
1280 /* Start items for tcm_loop_cit */
1282 struct se_wwn *tcm_loop_make_scsi_hba(
1283 struct target_fabric_configfs *tf,
1284 struct config_group *group,
1287 struct tcm_loop_hba *tl_hba;
1288 struct Scsi_Host *sh;
1292 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1294 printk(KERN_ERR "Unable to allocate struct tcm_loop_hba\n");
1295 return ERR_PTR(-ENOMEM);
1298 * Determine the emulated Protocol Identifier and Target Port Name
1299 * based on the incoming configfs directory name.
1301 ptr = strstr(name, "naa.");
1303 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1306 ptr = strstr(name, "fc.");
1308 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1309 off = 3; /* Skip over "fc." */
1312 ptr = strstr(name, "iqn.");
1314 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1318 printk(KERN_ERR "Unable to locate prefix for emulated Target Port:"
1320 return ERR_PTR(-EINVAL);
1323 if (strlen(name) > TL_WWN_ADDR_LEN) {
1324 printk(KERN_ERR "Emulated NAA %s Address: %s, exceeds"
1325 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1328 return ERR_PTR(-EINVAL);
1330 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1333 * Call device_register(tl_hba->dev) to register the emulated
1334 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1335 * device_register() callbacks in tcm_loop_driver_probe()
1337 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1342 tcm_loop_hba_no_cnt++;
1343 printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated emulated Target"
1344 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1345 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1347 return &tl_hba->tl_hba_wwn;
1350 return ERR_PTR(ret);
1353 void tcm_loop_drop_scsi_hba(
1356 struct tcm_loop_hba *tl_hba = container_of(wwn,
1357 struct tcm_loop_hba, tl_hba_wwn);
1358 int host_no = tl_hba->sh->host_no;
1360 * Call device_unregister() on the original tl_hba->dev.
1361 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1364 device_unregister(&tl_hba->dev);
1366 printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated emulated Target"
1367 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1368 config_item_name(&wwn->wwn_group.cg_item), host_no);
1371 /* Start items for tcm_loop_cit */
1372 static ssize_t tcm_loop_wwn_show_attr_version(
1373 struct target_fabric_configfs *tf,
1376 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1379 TF_WWN_ATTR_RO(tcm_loop, version);
1381 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1382 &tcm_loop_wwn_version.attr,
1386 /* End items for tcm_loop_cit */
1388 static int tcm_loop_register_configfs(void)
1390 struct target_fabric_configfs *fabric;
1391 struct config_group *tf_cg;
1394 * Set the TCM Loop HBA counter to zero
1396 tcm_loop_hba_no_cnt = 0;
1398 * Register the top level struct config_item_type with TCM core
1400 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1402 printk(KERN_ERR "tcm_loop_register_configfs() failed!\n");
1406 * Setup the fabric API of function pointers used by target_core_mod
1408 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1409 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1410 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1411 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1412 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1413 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1414 fabric->tf_ops.tpg_get_pr_transport_id_len =
1415 &tcm_loop_get_pr_transport_id_len;
1416 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1417 &tcm_loop_parse_pr_out_transport_id;
1418 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1419 fabric->tf_ops.tpg_check_demo_mode_cache =
1420 &tcm_loop_check_demo_mode_cache;
1421 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1422 &tcm_loop_check_demo_mode_write_protect;
1423 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1424 &tcm_loop_check_prod_mode_write_protect;
1426 * The TCM loopback fabric module runs in demo-mode to a local
1427 * virtual SCSI device, so fabric dependent initator ACLs are
1430 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1431 fabric->tf_ops.tpg_release_fabric_acl =
1432 &tcm_loop_tpg_release_fabric_acl;
1433 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1435 * Since tcm_loop is mapping physical memory from Linux/SCSI
1436 * struct scatterlist arrays for each struct scsi_cmnd I/O,
1437 * we do not need TCM to allocate a iovec array for
1438 * virtual memory address mappings
1440 fabric->tf_ops.alloc_cmd_iovecs = NULL;
1442 * Used for setting up remaining TCM resources in process context
1444 fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map;
1445 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1446 fabric->tf_ops.release_cmd_to_pool = &tcm_loop_deallocate_core_cmd;
1447 fabric->tf_ops.release_cmd_direct = &tcm_loop_deallocate_core_cmd;
1448 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1449 fabric->tf_ops.close_session = &tcm_loop_close_session;
1450 fabric->tf_ops.stop_session = &tcm_loop_stop_session;
1451 fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0;
1452 fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in;
1453 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1454 fabric->tf_ops.sess_get_initiator_sid = NULL;
1455 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1456 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1458 * Not used for TCM loopback
1460 fabric->tf_ops.set_default_node_attributes =
1461 &tcm_loop_set_default_node_attributes;
1462 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1463 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1464 fabric->tf_ops.new_cmd_failure = &tcm_loop_new_cmd_failure;
1465 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1466 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1467 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1468 fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1469 fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1470 fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove;
1472 tf_cg = &fabric->tf_group;
1474 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1476 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1477 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1478 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1479 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1481 * fabric_post_link() and fabric_pre_unlink() are used for
1482 * registration and release of TCM Loop Virtual SCSI LUNs.
1484 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1485 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1486 fabric->tf_ops.fabric_make_np = NULL;
1487 fabric->tf_ops.fabric_drop_np = NULL;
1489 * Setup default attribute lists for various fabric->tf_cit_tmpl
1491 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1492 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1493 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1494 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1495 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1497 * Once fabric->tf_ops has been setup, now register the fabric for
1500 ret = target_fabric_configfs_register(fabric);
1502 printk(KERN_ERR "target_fabric_configfs_register() for"
1503 " TCM_Loop failed!\n");
1504 target_fabric_configfs_free(fabric);
1508 * Setup our local pointer to *fabric.
1510 tcm_loop_fabric_configfs = fabric;
1511 printk(KERN_INFO "TCM_LOOP[0] - Set fabric ->"
1512 " tcm_loop_fabric_configfs\n");
1516 static void tcm_loop_deregister_configfs(void)
1518 if (!tcm_loop_fabric_configfs)
1521 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1522 tcm_loop_fabric_configfs = NULL;
1523 printk(KERN_INFO "TCM_LOOP[0] - Cleared"
1524 " tcm_loop_fabric_configfs\n");
1527 static int __init tcm_loop_fabric_init(void)
1531 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1532 sizeof(struct tcm_loop_cmd),
1533 __alignof__(struct tcm_loop_cmd),
1535 if (!tcm_loop_cmd_cache) {
1536 printk(KERN_ERR "kmem_cache_create() for"
1537 " tcm_loop_cmd_cache failed\n");
1541 ret = tcm_loop_alloc_core_bus();
1545 ret = tcm_loop_register_configfs();
1547 tcm_loop_release_core_bus();
1554 static void __exit tcm_loop_fabric_exit(void)
1556 tcm_loop_deregister_configfs();
1557 tcm_loop_release_core_bus();
1558 kmem_cache_destroy(tcm_loop_cmd_cache);
1561 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1562 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1563 MODULE_LICENSE("GPL");
1564 module_init(tcm_loop_fabric_init);
1565 module_exit(tcm_loop_fabric_exit);