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/*******************************************************************************
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* This file contains the Linux/SCSI LLD virtual SCSI initiator driver
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* for emulated SAS initiator ports
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* © Copyright 2011 RisingTide Systems LLC.
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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* Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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****************************************************************************/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/configfs.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_tcq.h>
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#include <target/target_core_base.h>
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#include <target/target_core_transport.h>
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#include <target/target_core_fabric_ops.h>
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#include <target/target_core_fabric_configfs.h>
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#include <target/target_core_fabric_lib.h>
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#include <target/target_core_configfs.h>
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#include <target/target_core_device.h>
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#include <target/target_core_tpg.h>
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#include <target/target_core_tmr.h>
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#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
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/* Local pointer to allocated TCM configfs fabric module */
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static struct target_fabric_configfs *tcm_loop_fabric_configfs;
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static struct kmem_cache *tcm_loop_cmd_cache;
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static int tcm_loop_hba_no_cnt;
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* Allocate a tcm_loop cmd descriptor from target_core_mod code
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* Can be called from interrupt context in tcm_loop_queuecommand() below
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static struct se_cmd *tcm_loop_allocate_core_cmd(
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struct tcm_loop_hba *tl_hba,
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struct se_portal_group *se_tpg,
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struct se_cmd *se_cmd;
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struct se_session *se_sess;
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struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
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struct tcm_loop_cmd *tl_cmd;
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scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
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set_host_byte(sc, DID_ERROR);
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se_sess = tl_nexus->se_sess;
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tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
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printk(KERN_ERR "Unable to allocate struct tcm_loop_cmd\n");
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set_host_byte(sc, DID_ERROR);
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se_cmd = &tl_cmd->tl_se_cmd;
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* Save the pointer to struct scsi_cmnd *sc
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* Locate the SAM Task Attr from struct scsi_cmnd *
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if (sc->device->tagged_supported) {
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case HEAD_OF_QUEUE_TAG:
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sam_task_attr = MSG_HEAD_TAG;
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case ORDERED_QUEUE_TAG:
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sam_task_attr = MSG_ORDERED_TAG;
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sam_task_attr = MSG_SIMPLE_TAG;
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sam_task_attr = MSG_SIMPLE_TAG;
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* Initialize struct se_cmd descriptor from target_core_mod infrastructure
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transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
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scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
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&tl_cmd->tl_sense_buf[0]);
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* Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
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if (scsi_bidi_cmnd(sc))
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T_TASK(se_cmd)->t_tasks_bidi = 1;
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* Locate the struct se_lun pointer and attach it to struct se_cmd
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if (transport_get_lun_for_cmd(se_cmd, NULL, tl_cmd->sc->device->lun) < 0) {
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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set_host_byte(sc, DID_NO_CONNECT);
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transport_device_setup_cmd(se_cmd);
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* Called by struct target_core_fabric_ops->new_cmd_map()
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* Always called in process context. A non zero return value
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* here will signal to handle an exception based on the return code.
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static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
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struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
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struct tcm_loop_cmd, tl_se_cmd);
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struct scsi_cmnd *sc = tl_cmd->sc;
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void *mem_ptr, *mem_bidi_ptr = NULL;
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* Allocate the necessary tasks to complete the received CDB+data
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ret = transport_generic_allocate_tasks(se_cmd, tl_cmd->sc->cmnd);
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/* Out of Resources */
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return PYX_TRANSPORT_LU_COMM_FAILURE;
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} else if (ret == -2) {
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* Handle case for SAM_STAT_RESERVATION_CONFLICT
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if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
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return PYX_TRANSPORT_RESERVATION_CONFLICT;
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* Otherwise, return SAM_STAT_CHECK_CONDITION and return
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return PYX_TRANSPORT_USE_SENSE_REASON;
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* Setup the struct scatterlist memory from the received
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if (scsi_sg_count(sc)) {
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se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM;
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mem_ptr = (void *)scsi_sglist(sc);
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* For BIDI commands, pass in the extra READ buffer
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* to transport_generic_map_mem_to_cmd() below..
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if (T_TASK(se_cmd)->t_tasks_bidi) {
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struct scsi_data_buffer *sdb = scsi_in(sc);
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mem_bidi_ptr = (void *)sdb->table.sgl;
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sg_no_bidi = sdb->table.nents;
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* Map the SG memory into struct se_mem->page linked list using the same
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* physical memory at sg->page_link.
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ret = transport_generic_map_mem_to_cmd(se_cmd, mem_ptr,
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scsi_sg_count(sc), mem_bidi_ptr, sg_no_bidi);
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return PYX_TRANSPORT_LU_COMM_FAILURE;
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* Called from struct target_core_fabric_ops->check_stop_free()
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static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
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* Do not release struct se_cmd's containing a valid TMR
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* pointer. These will be released directly in tcm_loop_device_reset()
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* with transport_generic_free_cmd().
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if (se_cmd->se_tmr_req)
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* Release the struct se_cmd, which will make a callback to release
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* struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
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transport_generic_free_cmd(se_cmd, 0, 1, 0);
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* Called from struct target_core_fabric_ops->release_cmd_to_pool()
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static void tcm_loop_deallocate_core_cmd(struct se_cmd *se_cmd)
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struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
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struct tcm_loop_cmd, tl_se_cmd);
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
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char **start, off_t offset,
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int length, int inout)
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return sprintf(buffer, "tcm_loop_proc_info()\n");
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static int tcm_loop_driver_probe(struct device *);
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static int tcm_loop_driver_remove(struct device *);
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static int pseudo_lld_bus_match(struct device *dev,
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struct device_driver *dev_driver)
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static struct bus_type tcm_loop_lld_bus = {
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.name = "tcm_loop_bus",
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.match = pseudo_lld_bus_match,
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.probe = tcm_loop_driver_probe,
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.remove = tcm_loop_driver_remove,
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static struct device_driver tcm_loop_driverfs = {
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.bus = &tcm_loop_lld_bus,
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* Used with root_device_register() in tcm_loop_alloc_core_bus() below
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struct device *tcm_loop_primary;
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* Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
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* drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
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static int tcm_loop_change_queue_depth(
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struct scsi_device *sdev,
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case SCSI_QDEPTH_DEFAULT:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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case SCSI_QDEPTH_QFULL:
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scsi_track_queue_full(sdev, depth);
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case SCSI_QDEPTH_RAMP_UP:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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return sdev->queue_depth;
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* Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
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* from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
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static int tcm_loop_queuecommand(
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struct Scsi_Host *sh,
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struct scsi_cmnd *sc)
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struct se_cmd *se_cmd;
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struct se_portal_group *se_tpg;
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_tpg *tl_tpg;
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TL_CDB_DEBUG("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
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" scsi_buf_len: %u\n", sc->device->host->host_no,
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sc->device->id, sc->device->channel, sc->device->lun,
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sc->cmnd[0], scsi_bufflen(sc));
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* Locate the tcm_loop_hba_t pointer
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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se_tpg = &tl_tpg->tl_se_tpg;
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* Determine the SAM Task Attribute and allocate tl_cmd and
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* tl_cmd->tl_se_cmd from TCM infrastructure
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se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
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* Queue up the newly allocated to be processed in TCM thread context.
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transport_generic_handle_cdb_map(se_cmd);
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* Called from SCSI EH process context to issue a LUN_RESET TMR
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* to struct scsi_device
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static int tcm_loop_device_reset(struct scsi_cmnd *sc)
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struct se_cmd *se_cmd = NULL;
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struct se_portal_group *se_tpg;
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struct se_session *se_sess;
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struct tcm_loop_cmd *tl_cmd = NULL;
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_nexus *tl_nexus;
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struct tcm_loop_tmr *tl_tmr = NULL;
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struct tcm_loop_tpg *tl_tpg;
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* Locate the tcm_loop_hba_t pointer
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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* Locate the tl_nexus and se_sess pointers
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tl_nexus = tl_hba->tl_nexus;
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printk(KERN_ERR "Unable to perform device reset without"
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" active I_T Nexus\n");
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se_sess = tl_nexus->se_sess;
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* Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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se_tpg = &tl_tpg->tl_se_tpg;
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tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
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printk(KERN_ERR "Unable to allocate memory for tl_cmd\n");
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tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
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printk(KERN_ERR "Unable to allocate memory for tl_tmr\n");
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init_waitqueue_head(&tl_tmr->tl_tmr_wait);
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se_cmd = &tl_cmd->tl_se_cmd;
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* Initialize struct se_cmd descriptor from target_core_mod infrastructure
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transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
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DMA_NONE, MSG_SIMPLE_TAG,
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&tl_cmd->tl_sense_buf[0]);
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* Allocate the LUN_RESET TMR
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se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, (void *)tl_tmr,
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if (IS_ERR(se_cmd->se_tmr_req))
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* Locate the underlying TCM struct se_lun from sc->device->lun
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if (transport_get_lun_for_tmr(se_cmd, sc->device->lun) < 0)
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* Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
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transport_generic_handle_tmr(se_cmd);
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wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
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* The TMR LUN_RESET has completed, check the response status and
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* then release allocations.
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ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
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transport_generic_free_cmd(se_cmd, 1, 1, 0);
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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static int tcm_loop_slave_alloc(struct scsi_device *sd)
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set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
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static int tcm_loop_slave_configure(struct scsi_device *sd)
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static struct scsi_host_template tcm_loop_driver_template = {
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.proc_info = tcm_loop_proc_info,
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.proc_name = "tcm_loopback",
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.name = "TCM_Loopback",
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.queuecommand = tcm_loop_queuecommand,
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.change_queue_depth = tcm_loop_change_queue_depth,
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.eh_device_reset_handler = tcm_loop_device_reset,
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.can_queue = TL_SCSI_CAN_QUEUE,
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.sg_tablesize = TL_SCSI_SG_TABLESIZE,
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.cmd_per_lun = TL_SCSI_CMD_PER_LUN,
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.max_sectors = TL_SCSI_MAX_SECTORS,
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.use_clustering = DISABLE_CLUSTERING,
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.slave_alloc = tcm_loop_slave_alloc,
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.slave_configure = tcm_loop_slave_configure,
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.module = THIS_MODULE,
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static int tcm_loop_driver_probe(struct device *dev)
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struct tcm_loop_hba *tl_hba;
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struct Scsi_Host *sh;
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tl_hba = to_tcm_loop_hba(dev);
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sh = scsi_host_alloc(&tcm_loop_driver_template,
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sizeof(struct tcm_loop_hba));
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printk(KERN_ERR "Unable to allocate struct scsi_host\n");
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* Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
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*((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
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* Setup single ID, Channel and LUN for now..
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sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
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error = scsi_add_host(sh, &tl_hba->dev);
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printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
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static int tcm_loop_driver_remove(struct device *dev)
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struct tcm_loop_hba *tl_hba;
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struct Scsi_Host *sh;
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tl_hba = to_tcm_loop_hba(dev);
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scsi_remove_host(sh);
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static void tcm_loop_release_adapter(struct device *dev)
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struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
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* Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
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static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
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tl_hba->dev.bus = &tcm_loop_lld_bus;
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tl_hba->dev.parent = tcm_loop_primary;
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tl_hba->dev.release = &tcm_loop_release_adapter;
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dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
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ret = device_register(&tl_hba->dev);
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printk(KERN_ERR "device_register() failed for"
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" tl_hba->dev: %d\n", ret);
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* Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
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static int tcm_loop_alloc_core_bus(void)
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tcm_loop_primary = root_device_register("tcm_loop_0");
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if (IS_ERR(tcm_loop_primary)) {
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printk(KERN_ERR "Unable to allocate tcm_loop_primary\n");
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return PTR_ERR(tcm_loop_primary);
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ret = bus_register(&tcm_loop_lld_bus);
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printk(KERN_ERR "bus_register() failed for tcm_loop_lld_bus\n");
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ret = driver_register(&tcm_loop_driverfs);
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printk(KERN_ERR "driver_register() failed for"
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"tcm_loop_driverfs\n");
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printk(KERN_INFO "Initialized TCM Loop Core Bus\n");
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bus_unregister(&tcm_loop_lld_bus);
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root_device_unregister(tcm_loop_primary);
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static void tcm_loop_release_core_bus(void)
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driver_unregister(&tcm_loop_driverfs);
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bus_unregister(&tcm_loop_lld_bus);
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root_device_unregister(tcm_loop_primary);
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printk(KERN_INFO "Releasing TCM Loop Core BUS\n");
571
static char *tcm_loop_get_fabric_name(void)
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static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
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struct tcm_loop_tpg *tl_tpg =
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(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
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struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
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* tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
583
* time based on the protocol dependent prefix of the passed configfs group.
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* Based upon tl_proto_id, TCM_Loop emulates the requested fabric
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* ProtocolID using target_core_fabric_lib.c symbols.
588
switch (tl_hba->tl_proto_id) {
589
case SCSI_PROTOCOL_SAS:
590
return sas_get_fabric_proto_ident(se_tpg);
591
case SCSI_PROTOCOL_FCP:
592
return fc_get_fabric_proto_ident(se_tpg);
593
case SCSI_PROTOCOL_ISCSI:
594
return iscsi_get_fabric_proto_ident(se_tpg);
596
printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
597
" SAS emulation\n", tl_hba->tl_proto_id);
601
return sas_get_fabric_proto_ident(se_tpg);
604
static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
606
struct tcm_loop_tpg *tl_tpg =
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(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
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* Return the passed NAA identifier for the SAS Target Port
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return &tl_tpg->tl_hba->tl_wwn_address[0];
614
static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
616
struct tcm_loop_tpg *tl_tpg =
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(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
619
* This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
620
* to represent the SCSI Target Port.
622
return tl_tpg->tl_tpgt;
625
static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
630
static u32 tcm_loop_get_pr_transport_id(
631
struct se_portal_group *se_tpg,
632
struct se_node_acl *se_nacl,
633
struct t10_pr_registration *pr_reg,
637
struct tcm_loop_tpg *tl_tpg =
638
(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
639
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
641
switch (tl_hba->tl_proto_id) {
642
case SCSI_PROTOCOL_SAS:
643
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
645
case SCSI_PROTOCOL_FCP:
646
return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
648
case SCSI_PROTOCOL_ISCSI:
649
return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
652
printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
653
" SAS emulation\n", tl_hba->tl_proto_id);
657
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
661
static u32 tcm_loop_get_pr_transport_id_len(
662
struct se_portal_group *se_tpg,
663
struct se_node_acl *se_nacl,
664
struct t10_pr_registration *pr_reg,
667
struct tcm_loop_tpg *tl_tpg =
668
(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
669
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
671
switch (tl_hba->tl_proto_id) {
672
case SCSI_PROTOCOL_SAS:
673
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
675
case SCSI_PROTOCOL_FCP:
676
return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
678
case SCSI_PROTOCOL_ISCSI:
679
return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
682
printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
683
" SAS emulation\n", tl_hba->tl_proto_id);
687
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
692
* Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
693
* Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
695
static char *tcm_loop_parse_pr_out_transport_id(
696
struct se_portal_group *se_tpg,
699
char **port_nexus_ptr)
701
struct tcm_loop_tpg *tl_tpg =
702
(struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
703
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
705
switch (tl_hba->tl_proto_id) {
706
case SCSI_PROTOCOL_SAS:
707
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
709
case SCSI_PROTOCOL_FCP:
710
return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
712
case SCSI_PROTOCOL_ISCSI:
713
return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
716
printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
717
" SAS emulation\n", tl_hba->tl_proto_id);
721
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
726
* Returning (1) here allows for target_core_mod struct se_node_acl to be generated
727
* based upon the incoming fabric dependent SCSI Initiator Port
729
static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
734
static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
740
* Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
741
* local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
743
static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
749
* Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
750
* never be called for TCM_Loop by target_core_fabric_configfs.c code.
751
* It has been added here as a nop for target_fabric_tf_ops_check()
753
static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
758
static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
759
struct se_portal_group *se_tpg)
761
struct tcm_loop_nacl *tl_nacl;
763
tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
765
printk(KERN_ERR "Unable to allocate struct tcm_loop_nacl\n");
769
return &tl_nacl->se_node_acl;
772
static void tcm_loop_tpg_release_fabric_acl(
773
struct se_portal_group *se_tpg,
774
struct se_node_acl *se_nacl)
776
struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
777
struct tcm_loop_nacl, se_node_acl);
782
static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
787
static void tcm_loop_new_cmd_failure(struct se_cmd *se_cmd)
790
* Since TCM_loop is already passing struct scatterlist data from
791
* struct scsi_cmnd, no more Linux/SCSI failure dependent state need
792
* to be handled here.
797
static int tcm_loop_is_state_remove(struct se_cmd *se_cmd)
800
* Assume struct scsi_cmnd is not in remove state..
805
static int tcm_loop_sess_logged_in(struct se_session *se_sess)
808
* Assume that TL Nexus is always active
813
static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
818
static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
823
static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
828
static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
830
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
831
struct tcm_loop_cmd, tl_se_cmd);
833
return tl_cmd->sc_cmd_state;
836
static int tcm_loop_shutdown_session(struct se_session *se_sess)
841
static void tcm_loop_close_session(struct se_session *se_sess)
846
static void tcm_loop_stop_session(
847
struct se_session *se_sess,
854
static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess)
859
static int tcm_loop_write_pending(struct se_cmd *se_cmd)
862
* Since Linux/SCSI has already sent down a struct scsi_cmnd
863
* sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
864
* memory, and memory has already been mapped to struct se_cmd->t_mem_list
865
* format with transport_generic_map_mem_to_cmd().
867
* We now tell TCM to add this WRITE CDB directly into the TCM storage
868
* object execution queue.
870
transport_generic_process_write(se_cmd);
874
static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
879
static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
881
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
882
struct tcm_loop_cmd, tl_se_cmd);
883
struct scsi_cmnd *sc = tl_cmd->sc;
885
TL_CDB_DEBUG("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
886
" cdb: 0x%02x\n", sc, sc->cmnd[0]);
888
sc->result = SAM_STAT_GOOD;
889
set_host_byte(sc, DID_OK);
894
static int tcm_loop_queue_status(struct se_cmd *se_cmd)
896
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
897
struct tcm_loop_cmd, tl_se_cmd);
898
struct scsi_cmnd *sc = tl_cmd->sc;
900
TL_CDB_DEBUG("tcm_loop_queue_status() called for scsi_cmnd: %p"
901
" cdb: 0x%02x\n", sc, sc->cmnd[0]);
903
if (se_cmd->sense_buffer &&
904
((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
905
(se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
907
memcpy((void *)sc->sense_buffer, (void *)se_cmd->sense_buffer,
908
SCSI_SENSE_BUFFERSIZE);
909
sc->result = SAM_STAT_CHECK_CONDITION;
910
set_driver_byte(sc, DRIVER_SENSE);
912
sc->result = se_cmd->scsi_status;
914
set_host_byte(sc, DID_OK);
919
static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
921
struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
922
struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
924
* The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
925
* and wake up the wait_queue_head_t in tcm_loop_device_reset()
927
atomic_set(&tl_tmr->tmr_complete, 1);
928
wake_up(&tl_tmr->tl_tmr_wait);
932
static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
937
static u16 tcm_loop_get_fabric_sense_len(void)
942
static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
944
switch (tl_hba->tl_proto_id) {
945
case SCSI_PROTOCOL_SAS:
947
case SCSI_PROTOCOL_FCP:
949
case SCSI_PROTOCOL_ISCSI:
958
/* Start items for tcm_loop_port_cit */
960
static int tcm_loop_port_link(
961
struct se_portal_group *se_tpg,
964
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
965
struct tcm_loop_tpg, tl_se_tpg);
966
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
968
atomic_inc(&tl_tpg->tl_tpg_port_count);
969
smp_mb__after_atomic_inc();
971
* Add Linux/SCSI struct scsi_device by HCTL
973
scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
975
printk(KERN_INFO "TCM_Loop_ConfigFS: Port Link Successful\n");
979
static void tcm_loop_port_unlink(
980
struct se_portal_group *se_tpg,
981
struct se_lun *se_lun)
983
struct scsi_device *sd;
984
struct tcm_loop_hba *tl_hba;
985
struct tcm_loop_tpg *tl_tpg;
987
tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
988
tl_hba = tl_tpg->tl_hba;
990
sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
991
se_lun->unpacked_lun);
993
printk(KERN_ERR "Unable to locate struct scsi_device for %d:%d:"
994
"%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
998
* Remove Linux/SCSI struct scsi_device by HCTL
1000
scsi_remove_device(sd);
1001
scsi_device_put(sd);
1003
atomic_dec(&tl_tpg->tl_tpg_port_count);
1004
smp_mb__after_atomic_dec();
1006
printk(KERN_INFO "TCM_Loop_ConfigFS: Port Unlink Successful\n");
1009
/* End items for tcm_loop_port_cit */
1011
/* Start items for tcm_loop_nexus_cit */
1013
static int tcm_loop_make_nexus(
1014
struct tcm_loop_tpg *tl_tpg,
1017
struct se_portal_group *se_tpg;
1018
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1019
struct tcm_loop_nexus *tl_nexus;
1022
if (tl_tpg->tl_hba->tl_nexus) {
1023
printk(KERN_INFO "tl_tpg->tl_hba->tl_nexus already exists\n");
1026
se_tpg = &tl_tpg->tl_se_tpg;
1028
tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1030
printk(KERN_ERR "Unable to allocate struct tcm_loop_nexus\n");
1034
* Initialize the struct se_session pointer
1036
tl_nexus->se_sess = transport_init_session();
1037
if (IS_ERR(tl_nexus->se_sess)) {
1038
ret = PTR_ERR(tl_nexus->se_sess);
1042
* Since we are running in 'demo mode' this call with generate a
1043
* struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1044
* Initiator port name of the passed configfs group 'name'.
1046
tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1047
se_tpg, (unsigned char *)name);
1048
if (!tl_nexus->se_sess->se_node_acl) {
1049
transport_free_session(tl_nexus->se_sess);
1053
* Now, register the SAS I_T Nexus as active with the call to
1054
* transport_register_session()
1056
__transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1057
tl_nexus->se_sess, (void *)tl_nexus);
1058
tl_tpg->tl_hba->tl_nexus = tl_nexus;
1059
printk(KERN_INFO "TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1060
" %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1069
static int tcm_loop_drop_nexus(
1070
struct tcm_loop_tpg *tpg)
1072
struct se_session *se_sess;
1073
struct tcm_loop_nexus *tl_nexus;
1074
struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1076
tl_nexus = tpg->tl_hba->tl_nexus;
1080
se_sess = tl_nexus->se_sess;
1084
if (atomic_read(&tpg->tl_tpg_port_count)) {
1085
printk(KERN_ERR "Unable to remove TCM_Loop I_T Nexus with"
1086
" active TPG port count: %d\n",
1087
atomic_read(&tpg->tl_tpg_port_count));
1091
printk(KERN_INFO "TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1092
" %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1093
tl_nexus->se_sess->se_node_acl->initiatorname);
1095
* Release the SCSI I_T Nexus to the emulated SAS Target Port
1097
transport_deregister_session(tl_nexus->se_sess);
1098
tpg->tl_hba->tl_nexus = NULL;
1103
/* End items for tcm_loop_nexus_cit */
1105
static ssize_t tcm_loop_tpg_show_nexus(
1106
struct se_portal_group *se_tpg,
1109
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1110
struct tcm_loop_tpg, tl_se_tpg);
1111
struct tcm_loop_nexus *tl_nexus;
1114
tl_nexus = tl_tpg->tl_hba->tl_nexus;
1118
ret = snprintf(page, PAGE_SIZE, "%s\n",
1119
tl_nexus->se_sess->se_node_acl->initiatorname);
1124
static ssize_t tcm_loop_tpg_store_nexus(
1125
struct se_portal_group *se_tpg,
1129
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1130
struct tcm_loop_tpg, tl_se_tpg);
1131
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1132
unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1135
* Shutdown the active I_T nexus if 'NULL' is passed..
1137
if (!strncmp(page, "NULL", 4)) {
1138
ret = tcm_loop_drop_nexus(tl_tpg);
1139
return (!ret) ? count : ret;
1142
* Otherwise make sure the passed virtual Initiator port WWN matches
1143
* the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1144
* tcm_loop_make_nexus()
1146
if (strlen(page) >= TL_WWN_ADDR_LEN) {
1147
printk(KERN_ERR "Emulated NAA Sas Address: %s, exceeds"
1148
" max: %d\n", page, TL_WWN_ADDR_LEN);
1151
snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1153
ptr = strstr(i_port, "naa.");
1155
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1156
printk(KERN_ERR "Passed SAS Initiator Port %s does not"
1157
" match target port protoid: %s\n", i_port,
1158
tcm_loop_dump_proto_id(tl_hba));
1161
port_ptr = &i_port[0];
1164
ptr = strstr(i_port, "fc.");
1166
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1167
printk(KERN_ERR "Passed FCP Initiator Port %s does not"
1168
" match target port protoid: %s\n", i_port,
1169
tcm_loop_dump_proto_id(tl_hba));
1172
port_ptr = &i_port[3]; /* Skip over "fc." */
1175
ptr = strstr(i_port, "iqn.");
1177
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1178
printk(KERN_ERR "Passed iSCSI Initiator Port %s does not"
1179
" match target port protoid: %s\n", i_port,
1180
tcm_loop_dump_proto_id(tl_hba));
1183
port_ptr = &i_port[0];
1186
printk(KERN_ERR "Unable to locate prefix for emulated Initiator Port:"
1190
* Clear any trailing newline for the NAA WWN
1193
if (i_port[strlen(i_port)-1] == '\n')
1194
i_port[strlen(i_port)-1] = '\0';
1196
ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1203
TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1205
static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1206
&tcm_loop_tpg_nexus.attr,
1210
/* Start items for tcm_loop_naa_cit */
1212
struct se_portal_group *tcm_loop_make_naa_tpg(
1214
struct config_group *group,
1217
struct tcm_loop_hba *tl_hba = container_of(wwn,
1218
struct tcm_loop_hba, tl_hba_wwn);
1219
struct tcm_loop_tpg *tl_tpg;
1220
char *tpgt_str, *end_ptr;
1222
unsigned short int tpgt;
1224
tpgt_str = strstr(name, "tpgt_");
1226
printk(KERN_ERR "Unable to locate \"tpgt_#\" directory"
1228
return ERR_PTR(-EINVAL);
1230
tpgt_str += 5; /* Skip ahead of "tpgt_" */
1231
tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1233
if (tpgt > TL_TPGS_PER_HBA) {
1234
printk(KERN_ERR "Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1235
" %u\n", tpgt, TL_TPGS_PER_HBA);
1236
return ERR_PTR(-EINVAL);
1238
tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1239
tl_tpg->tl_hba = tl_hba;
1240
tl_tpg->tl_tpgt = tpgt;
1242
* Register the tl_tpg as a emulated SAS TCM Target Endpoint
1244
ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1245
wwn, &tl_tpg->tl_se_tpg, (void *)tl_tpg,
1246
TRANSPORT_TPG_TYPE_NORMAL);
1248
return ERR_PTR(-ENOMEM);
1250
printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated Emulated %s"
1251
" Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1252
config_item_name(&wwn->wwn_group.cg_item), tpgt);
1254
return &tl_tpg->tl_se_tpg;
1257
void tcm_loop_drop_naa_tpg(
1258
struct se_portal_group *se_tpg)
1260
struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1261
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1262
struct tcm_loop_tpg, tl_se_tpg);
1263
struct tcm_loop_hba *tl_hba;
1264
unsigned short tpgt;
1266
tl_hba = tl_tpg->tl_hba;
1267
tpgt = tl_tpg->tl_tpgt;
1269
* Release the I_T Nexus for the Virtual SAS link if present
1271
tcm_loop_drop_nexus(tl_tpg);
1273
* Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1275
core_tpg_deregister(se_tpg);
1277
printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated Emulated %s"
1278
" Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1279
config_item_name(&wwn->wwn_group.cg_item), tpgt);
1282
/* End items for tcm_loop_naa_cit */
1284
/* Start items for tcm_loop_cit */
1286
struct se_wwn *tcm_loop_make_scsi_hba(
1287
struct target_fabric_configfs *tf,
1288
struct config_group *group,
1291
struct tcm_loop_hba *tl_hba;
1292
struct Scsi_Host *sh;
1296
tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1298
printk(KERN_ERR "Unable to allocate struct tcm_loop_hba\n");
1299
return ERR_PTR(-ENOMEM);
1302
* Determine the emulated Protocol Identifier and Target Port Name
1303
* based on the incoming configfs directory name.
1305
ptr = strstr(name, "naa.");
1307
tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1310
ptr = strstr(name, "fc.");
1312
tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1313
off = 3; /* Skip over "fc." */
1316
ptr = strstr(name, "iqn.");
1318
tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1322
printk(KERN_ERR "Unable to locate prefix for emulated Target Port:"
1324
return ERR_PTR(-EINVAL);
1327
if (strlen(name) >= TL_WWN_ADDR_LEN) {
1328
printk(KERN_ERR "Emulated NAA %s Address: %s, exceeds"
1329
" max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1332
return ERR_PTR(-EINVAL);
1334
snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1337
* Call device_register(tl_hba->dev) to register the emulated
1338
* Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1339
* device_register() callbacks in tcm_loop_driver_probe()
1341
ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1346
tcm_loop_hba_no_cnt++;
1347
printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated emulated Target"
1348
" %s Address: %s at Linux/SCSI Host ID: %d\n",
1349
tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1351
return &tl_hba->tl_hba_wwn;
1354
return ERR_PTR(ret);
1357
void tcm_loop_drop_scsi_hba(
1360
struct tcm_loop_hba *tl_hba = container_of(wwn,
1361
struct tcm_loop_hba, tl_hba_wwn);
1362
int host_no = tl_hba->sh->host_no;
1364
* Call device_unregister() on the original tl_hba->dev.
1365
* tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1368
device_unregister(&tl_hba->dev);
1370
printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated emulated Target"
1371
" SAS Address: %s at Linux/SCSI Host ID: %d\n",
1372
config_item_name(&wwn->wwn_group.cg_item), host_no);
1375
/* Start items for tcm_loop_cit */
1376
static ssize_t tcm_loop_wwn_show_attr_version(
1377
struct target_fabric_configfs *tf,
1380
return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1383
TF_WWN_ATTR_RO(tcm_loop, version);
1385
static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1386
&tcm_loop_wwn_version.attr,
1390
/* End items for tcm_loop_cit */
1392
static int tcm_loop_register_configfs(void)
1394
struct target_fabric_configfs *fabric;
1395
struct config_group *tf_cg;
1398
* Set the TCM Loop HBA counter to zero
1400
tcm_loop_hba_no_cnt = 0;
1402
* Register the top level struct config_item_type with TCM core
1404
fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1406
printk(KERN_ERR "tcm_loop_register_configfs() failed!\n");
1410
* Setup the fabric API of function pointers used by target_core_mod
1412
fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1413
fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1414
fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1415
fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1416
fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1417
fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1418
fabric->tf_ops.tpg_get_pr_transport_id_len =
1419
&tcm_loop_get_pr_transport_id_len;
1420
fabric->tf_ops.tpg_parse_pr_out_transport_id =
1421
&tcm_loop_parse_pr_out_transport_id;
1422
fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1423
fabric->tf_ops.tpg_check_demo_mode_cache =
1424
&tcm_loop_check_demo_mode_cache;
1425
fabric->tf_ops.tpg_check_demo_mode_write_protect =
1426
&tcm_loop_check_demo_mode_write_protect;
1427
fabric->tf_ops.tpg_check_prod_mode_write_protect =
1428
&tcm_loop_check_prod_mode_write_protect;
1430
* The TCM loopback fabric module runs in demo-mode to a local
1431
* virtual SCSI device, so fabric dependent initator ACLs are
1434
fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1435
fabric->tf_ops.tpg_release_fabric_acl =
1436
&tcm_loop_tpg_release_fabric_acl;
1437
fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1439
* Since tcm_loop is mapping physical memory from Linux/SCSI
1440
* struct scatterlist arrays for each struct scsi_cmnd I/O,
1441
* we do not need TCM to allocate a iovec array for
1442
* virtual memory address mappings
1444
fabric->tf_ops.alloc_cmd_iovecs = NULL;
1446
* Used for setting up remaining TCM resources in process context
1448
fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map;
1449
fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1450
fabric->tf_ops.release_cmd_to_pool = &tcm_loop_deallocate_core_cmd;
1451
fabric->tf_ops.release_cmd_direct = &tcm_loop_deallocate_core_cmd;
1452
fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1453
fabric->tf_ops.close_session = &tcm_loop_close_session;
1454
fabric->tf_ops.stop_session = &tcm_loop_stop_session;
1455
fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0;
1456
fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in;
1457
fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1458
fabric->tf_ops.sess_get_initiator_sid = NULL;
1459
fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1460
fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1462
* Not used for TCM loopback
1464
fabric->tf_ops.set_default_node_attributes =
1465
&tcm_loop_set_default_node_attributes;
1466
fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1467
fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1468
fabric->tf_ops.new_cmd_failure = &tcm_loop_new_cmd_failure;
1469
fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1470
fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1471
fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1472
fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1473
fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1474
fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove;
1476
tf_cg = &fabric->tf_group;
1478
* Setup function pointers for generic logic in target_core_fabric_configfs.c
1480
fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1481
fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1482
fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1483
fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1485
* fabric_post_link() and fabric_pre_unlink() are used for
1486
* registration and release of TCM Loop Virtual SCSI LUNs.
1488
fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1489
fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1490
fabric->tf_ops.fabric_make_np = NULL;
1491
fabric->tf_ops.fabric_drop_np = NULL;
1493
* Setup default attribute lists for various fabric->tf_cit_tmpl
1495
TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1496
TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1497
TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1498
TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1499
TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1501
* Once fabric->tf_ops has been setup, now register the fabric for
1504
ret = target_fabric_configfs_register(fabric);
1506
printk(KERN_ERR "target_fabric_configfs_register() for"
1507
" TCM_Loop failed!\n");
1508
target_fabric_configfs_free(fabric);
1512
* Setup our local pointer to *fabric.
1514
tcm_loop_fabric_configfs = fabric;
1515
printk(KERN_INFO "TCM_LOOP[0] - Set fabric ->"
1516
" tcm_loop_fabric_configfs\n");
1520
static void tcm_loop_deregister_configfs(void)
1522
if (!tcm_loop_fabric_configfs)
1525
target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1526
tcm_loop_fabric_configfs = NULL;
1527
printk(KERN_INFO "TCM_LOOP[0] - Cleared"
1528
" tcm_loop_fabric_configfs\n");
1531
static int __init tcm_loop_fabric_init(void)
1535
tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1536
sizeof(struct tcm_loop_cmd),
1537
__alignof__(struct tcm_loop_cmd),
1539
if (!tcm_loop_cmd_cache) {
1540
printk(KERN_ERR "kmem_cache_create() for"
1541
" tcm_loop_cmd_cache failed\n");
1545
ret = tcm_loop_alloc_core_bus();
1549
ret = tcm_loop_register_configfs();
1551
tcm_loop_release_core_bus();
1558
static void __exit tcm_loop_fabric_exit(void)
1560
tcm_loop_deregister_configfs();
1561
tcm_loop_release_core_bus();
1562
kmem_cache_destroy(tcm_loop_cmd_cache);
1565
MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1566
MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1567
MODULE_LICENSE("GPL");
1568
module_init(tcm_loop_fabric_init);
1569
module_exit(tcm_loop_fabric_exit);