v4.19.13 snapshot.
diff --git a/drivers/target/loopback/Kconfig b/drivers/target/loopback/Kconfig
new file mode 100644
index 0000000..158ee9d
--- /dev/null
+++ b/drivers/target/loopback/Kconfig
@@ -0,0 +1,6 @@
+config LOOPBACK_TARGET
+ tristate "TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module"
+ depends on SCSI
+ help
+ Say Y here to enable the TCM Virtual SAS target and Linux/SCSI LLD
+ fabric loopback module.
diff --git a/drivers/target/loopback/Makefile b/drivers/target/loopback/Makefile
new file mode 100644
index 0000000..6abebdf
--- /dev/null
+++ b/drivers/target/loopback/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_LOOPBACK_TARGET) += tcm_loop.o
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
new file mode 100644
index 0000000..bc8918f
--- /dev/null
+++ b/drivers/target/loopback/tcm_loop.c
@@ -0,0 +1,1235 @@
+/*******************************************************************************
+ *
+ * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
+ * for emulated SAS initiator ports
+ *
+ * © Copyright 2011-2013 Datera, Inc.
+ *
+ * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
+ *
+ * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/configfs.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+
+#include "tcm_loop.h"
+
+#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
+
+static struct workqueue_struct *tcm_loop_workqueue;
+static struct kmem_cache *tcm_loop_cmd_cache;
+
+static int tcm_loop_hba_no_cnt;
+
+static int tcm_loop_queue_status(struct se_cmd *se_cmd);
+
+/*
+ * Called from struct target_core_fabric_ops->check_stop_free()
+ */
+static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
+{
+ return transport_generic_free_cmd(se_cmd, 0);
+}
+
+static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
+{
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+
+ kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
+}
+
+static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+ seq_puts(m, "tcm_loop_proc_info()\n");
+ return 0;
+}
+
+static int tcm_loop_driver_probe(struct device *);
+static int tcm_loop_driver_remove(struct device *);
+
+static int pseudo_lld_bus_match(struct device *dev,
+ struct device_driver *dev_driver)
+{
+ return 1;
+}
+
+static struct bus_type tcm_loop_lld_bus = {
+ .name = "tcm_loop_bus",
+ .match = pseudo_lld_bus_match,
+ .probe = tcm_loop_driver_probe,
+ .remove = tcm_loop_driver_remove,
+};
+
+static struct device_driver tcm_loop_driverfs = {
+ .name = "tcm_loop",
+ .bus = &tcm_loop_lld_bus,
+};
+/*
+ * Used with root_device_register() in tcm_loop_alloc_core_bus() below
+ */
+static struct device *tcm_loop_primary;
+
+static void tcm_loop_submission_work(struct work_struct *work)
+{
+ struct tcm_loop_cmd *tl_cmd =
+ container_of(work, struct tcm_loop_cmd, work);
+ struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
+ struct scsi_cmnd *sc = tl_cmd->sc;
+ struct tcm_loop_nexus *tl_nexus;
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_tpg *tl_tpg;
+ struct scatterlist *sgl_bidi = NULL;
+ u32 sgl_bidi_count = 0, transfer_length;
+ int rc;
+
+ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
+ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
+
+ /*
+ * Ensure that this tl_tpg reference from the incoming sc->device->id
+ * has already been configured via tcm_loop_make_naa_tpg().
+ */
+ if (!tl_tpg->tl_hba) {
+ set_host_byte(sc, DID_NO_CONNECT);
+ goto out_done;
+ }
+ if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
+ set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
+ goto out_done;
+ }
+ tl_nexus = tl_tpg->tl_nexus;
+ if (!tl_nexus) {
+ scmd_printk(KERN_ERR, sc,
+ "TCM_Loop I_T Nexus does not exist\n");
+ set_host_byte(sc, DID_ERROR);
+ goto out_done;
+ }
+ if (scsi_bidi_cmnd(sc)) {
+ struct scsi_data_buffer *sdb = scsi_in(sc);
+
+ sgl_bidi = sdb->table.sgl;
+ sgl_bidi_count = sdb->table.nents;
+ se_cmd->se_cmd_flags |= SCF_BIDI;
+
+ }
+
+ transfer_length = scsi_transfer_length(sc);
+ if (!scsi_prot_sg_count(sc) &&
+ scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
+ se_cmd->prot_pto = true;
+ /*
+ * loopback transport doesn't support
+ * WRITE_GENERATE, READ_STRIP protection
+ * information operations, go ahead unprotected.
+ */
+ transfer_length = scsi_bufflen(sc);
+ }
+
+ se_cmd->tag = tl_cmd->sc_cmd_tag;
+ rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
+ &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
+ transfer_length, TCM_SIMPLE_TAG,
+ sc->sc_data_direction, 0,
+ scsi_sglist(sc), scsi_sg_count(sc),
+ sgl_bidi, sgl_bidi_count,
+ scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
+ if (rc < 0) {
+ set_host_byte(sc, DID_NO_CONNECT);
+ goto out_done;
+ }
+ return;
+
+out_done:
+ kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
+ sc->scsi_done(sc);
+}
+
+/*
+ * ->queuecommand can be and usually is called from interrupt context, so
+ * defer the actual submission to a workqueue.
+ */
+static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
+{
+ struct tcm_loop_cmd *tl_cmd;
+
+ pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
+ __func__, sc->device->host->host_no, sc->device->id,
+ sc->device->channel, sc->device->lun, sc->cmnd[0],
+ scsi_bufflen(sc));
+
+ tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
+ if (!tl_cmd) {
+ set_host_byte(sc, DID_ERROR);
+ sc->scsi_done(sc);
+ return 0;
+ }
+
+ tl_cmd->sc = sc;
+ tl_cmd->sc_cmd_tag = sc->request->tag;
+ INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
+ queue_work(tcm_loop_workqueue, &tl_cmd->work);
+ return 0;
+}
+
+/*
+ * Called from SCSI EH process context to issue a LUN_RESET TMR
+ * to struct scsi_device
+ */
+static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
+ u64 lun, int task, enum tcm_tmreq_table tmr)
+{
+ struct se_cmd *se_cmd;
+ struct se_session *se_sess;
+ struct tcm_loop_nexus *tl_nexus;
+ struct tcm_loop_cmd *tl_cmd;
+ int ret = TMR_FUNCTION_FAILED, rc;
+
+ /*
+ * Locate the tl_nexus and se_sess pointers
+ */
+ tl_nexus = tl_tpg->tl_nexus;
+ if (!tl_nexus) {
+ pr_err("Unable to perform device reset without active I_T Nexus\n");
+ return ret;
+ }
+
+ tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
+ if (!tl_cmd)
+ return ret;
+
+ init_completion(&tl_cmd->tmr_done);
+
+ se_cmd = &tl_cmd->tl_se_cmd;
+ se_sess = tl_tpg->tl_nexus->se_sess;
+
+ rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
+ NULL, tmr, GFP_KERNEL, task,
+ TARGET_SCF_ACK_KREF);
+ if (rc < 0)
+ goto release;
+ wait_for_completion(&tl_cmd->tmr_done);
+ ret = se_cmd->se_tmr_req->response;
+ target_put_sess_cmd(se_cmd);
+
+out:
+ return ret;
+
+release:
+ kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
+ goto out;
+}
+
+static int tcm_loop_abort_task(struct scsi_cmnd *sc)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_tpg *tl_tpg;
+ int ret = FAILED;
+
+ /*
+ * Locate the tcm_loop_hba_t pointer
+ */
+ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
+ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
+ ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
+ sc->request->tag, TMR_ABORT_TASK);
+ return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
+}
+
+/*
+ * Called from SCSI EH process context to issue a LUN_RESET TMR
+ * to struct scsi_device
+ */
+static int tcm_loop_device_reset(struct scsi_cmnd *sc)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_tpg *tl_tpg;
+ int ret = FAILED;
+
+ /*
+ * Locate the tcm_loop_hba_t pointer
+ */
+ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
+ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
+
+ ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
+ 0, TMR_LUN_RESET);
+ return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
+}
+
+static int tcm_loop_target_reset(struct scsi_cmnd *sc)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_tpg *tl_tpg;
+
+ /*
+ * Locate the tcm_loop_hba_t pointer
+ */
+ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
+ if (!tl_hba) {
+ pr_err("Unable to perform device reset without active I_T Nexus\n");
+ return FAILED;
+ }
+ /*
+ * Locate the tl_tpg pointer from TargetID in sc->device->id
+ */
+ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
+ if (tl_tpg) {
+ tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
+ return SUCCESS;
+ }
+ return FAILED;
+}
+
+static int tcm_loop_slave_alloc(struct scsi_device *sd)
+{
+ blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
+ return 0;
+}
+
+static struct scsi_host_template tcm_loop_driver_template = {
+ .show_info = tcm_loop_show_info,
+ .proc_name = "tcm_loopback",
+ .name = "TCM_Loopback",
+ .queuecommand = tcm_loop_queuecommand,
+ .change_queue_depth = scsi_change_queue_depth,
+ .eh_abort_handler = tcm_loop_abort_task,
+ .eh_device_reset_handler = tcm_loop_device_reset,
+ .eh_target_reset_handler = tcm_loop_target_reset,
+ .can_queue = 1024,
+ .this_id = -1,
+ .sg_tablesize = 256,
+ .cmd_per_lun = 1024,
+ .max_sectors = 0xFFFF,
+ .use_clustering = DISABLE_CLUSTERING,
+ .slave_alloc = tcm_loop_slave_alloc,
+ .module = THIS_MODULE,
+ .track_queue_depth = 1,
+};
+
+static int tcm_loop_driver_probe(struct device *dev)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct Scsi_Host *sh;
+ int error, host_prot;
+
+ tl_hba = to_tcm_loop_hba(dev);
+
+ sh = scsi_host_alloc(&tcm_loop_driver_template,
+ sizeof(struct tcm_loop_hba));
+ if (!sh) {
+ pr_err("Unable to allocate struct scsi_host\n");
+ return -ENODEV;
+ }
+ tl_hba->sh = sh;
+
+ /*
+ * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
+ */
+ *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
+ /*
+ * Setup single ID, Channel and LUN for now..
+ */
+ sh->max_id = 2;
+ sh->max_lun = 0;
+ sh->max_channel = 0;
+ sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
+
+ host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
+ SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
+ SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
+
+ scsi_host_set_prot(sh, host_prot);
+ scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
+
+ error = scsi_add_host(sh, &tl_hba->dev);
+ if (error) {
+ pr_err("%s: scsi_add_host failed\n", __func__);
+ scsi_host_put(sh);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static int tcm_loop_driver_remove(struct device *dev)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct Scsi_Host *sh;
+
+ tl_hba = to_tcm_loop_hba(dev);
+ sh = tl_hba->sh;
+
+ scsi_remove_host(sh);
+ scsi_host_put(sh);
+ return 0;
+}
+
+static void tcm_loop_release_adapter(struct device *dev)
+{
+ struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
+
+ kfree(tl_hba);
+}
+
+/*
+ * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
+ */
+static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
+{
+ int ret;
+
+ tl_hba->dev.bus = &tcm_loop_lld_bus;
+ tl_hba->dev.parent = tcm_loop_primary;
+ tl_hba->dev.release = &tcm_loop_release_adapter;
+ dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
+
+ ret = device_register(&tl_hba->dev);
+ if (ret) {
+ pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
+ * tcm_loop SCSI bus.
+ */
+static int tcm_loop_alloc_core_bus(void)
+{
+ int ret;
+
+ tcm_loop_primary = root_device_register("tcm_loop_0");
+ if (IS_ERR(tcm_loop_primary)) {
+ pr_err("Unable to allocate tcm_loop_primary\n");
+ return PTR_ERR(tcm_loop_primary);
+ }
+
+ ret = bus_register(&tcm_loop_lld_bus);
+ if (ret) {
+ pr_err("bus_register() failed for tcm_loop_lld_bus\n");
+ goto dev_unreg;
+ }
+
+ ret = driver_register(&tcm_loop_driverfs);
+ if (ret) {
+ pr_err("driver_register() failed for tcm_loop_driverfs\n");
+ goto bus_unreg;
+ }
+
+ pr_debug("Initialized TCM Loop Core Bus\n");
+ return ret;
+
+bus_unreg:
+ bus_unregister(&tcm_loop_lld_bus);
+dev_unreg:
+ root_device_unregister(tcm_loop_primary);
+ return ret;
+}
+
+static void tcm_loop_release_core_bus(void)
+{
+ driver_unregister(&tcm_loop_driverfs);
+ bus_unregister(&tcm_loop_lld_bus);
+ root_device_unregister(tcm_loop_primary);
+
+ pr_debug("Releasing TCM Loop Core BUS\n");
+}
+
+static char *tcm_loop_get_fabric_name(void)
+{
+ return "loopback";
+}
+
+static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
+{
+ return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
+}
+
+static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
+{
+ /*
+ * Return the passed NAA identifier for the Target Port
+ */
+ return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
+}
+
+static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
+{
+ /*
+ * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
+ * to represent the SCSI Target Port.
+ */
+ return tl_tpg(se_tpg)->tl_tpgt;
+}
+
+/*
+ * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
+ * based upon the incoming fabric dependent SCSI Initiator Port
+ */
+static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+/*
+ * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
+ * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
+ */
+static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+/*
+ * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
+ * never be called for TCM_Loop by target_core_fabric_configfs.c code.
+ * It has been added here as a nop for target_fabric_tf_ops_check()
+ */
+static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
+{
+ return 0;
+}
+
+static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+ return tl_tpg->tl_fabric_prot_type;
+}
+
+static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
+{
+ return 1;
+}
+
+static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
+{
+ return 1;
+}
+
+static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
+{
+ return;
+}
+
+static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
+{
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+
+ return tl_cmd->sc_cmd_state;
+}
+
+static int tcm_loop_write_pending(struct se_cmd *se_cmd)
+{
+ /*
+ * Since Linux/SCSI has already sent down a struct scsi_cmnd
+ * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
+ * memory, and memory has already been mapped to struct se_cmd->t_mem_list
+ * format with transport_generic_map_mem_to_cmd().
+ *
+ * We now tell TCM to add this WRITE CDB directly into the TCM storage
+ * object execution queue.
+ */
+ target_execute_cmd(se_cmd);
+ return 0;
+}
+
+static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
+{
+ return 0;
+}
+
+static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
+{
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+ struct scsi_cmnd *sc = tl_cmd->sc;
+
+ pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
+ __func__, sc, sc->cmnd[0]);
+
+ sc->result = SAM_STAT_GOOD;
+ set_host_byte(sc, DID_OK);
+ if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
+ (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
+ scsi_set_resid(sc, se_cmd->residual_count);
+ sc->scsi_done(sc);
+ return 0;
+}
+
+static int tcm_loop_queue_status(struct se_cmd *se_cmd)
+{
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+ struct scsi_cmnd *sc = tl_cmd->sc;
+
+ pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
+ __func__, sc, sc->cmnd[0]);
+
+ if (se_cmd->sense_buffer &&
+ ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
+ (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
+
+ memcpy(sc->sense_buffer, se_cmd->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE);
+ sc->result = SAM_STAT_CHECK_CONDITION;
+ set_driver_byte(sc, DRIVER_SENSE);
+ } else
+ sc->result = se_cmd->scsi_status;
+
+ set_host_byte(sc, DID_OK);
+ if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
+ (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
+ scsi_set_resid(sc, se_cmd->residual_count);
+ sc->scsi_done(sc);
+ return 0;
+}
+
+static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
+{
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+
+ /* Wake up tcm_loop_issue_tmr(). */
+ complete(&tl_cmd->tmr_done);
+}
+
+static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
+{
+ return;
+}
+
+static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
+{
+ switch (tl_hba->tl_proto_id) {
+ case SCSI_PROTOCOL_SAS:
+ return "SAS";
+ case SCSI_PROTOCOL_FCP:
+ return "FCP";
+ case SCSI_PROTOCOL_ISCSI:
+ return "iSCSI";
+ default:
+ break;
+ }
+
+ return "Unknown";
+}
+
+/* Start items for tcm_loop_port_cit */
+
+static int tcm_loop_port_link(
+ struct se_portal_group *se_tpg,
+ struct se_lun *lun)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
+
+ atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
+ /*
+ * Add Linux/SCSI struct scsi_device by HCTL
+ */
+ scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
+
+ pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
+ return 0;
+}
+
+static void tcm_loop_port_unlink(
+ struct se_portal_group *se_tpg,
+ struct se_lun *se_lun)
+{
+ struct scsi_device *sd;
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_tpg *tl_tpg;
+
+ tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
+ tl_hba = tl_tpg->tl_hba;
+
+ sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
+ se_lun->unpacked_lun);
+ if (!sd) {
+ pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
+ 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
+ return;
+ }
+ /*
+ * Remove Linux/SCSI struct scsi_device by HCTL
+ */
+ scsi_remove_device(sd);
+ scsi_device_put(sd);
+
+ atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
+
+ pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
+}
+
+/* End items for tcm_loop_port_cit */
+
+static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
+ struct config_item *item, char *page)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+
+ return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
+}
+
+static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
+ struct config_item *item, const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = attrib_to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+ unsigned long val;
+ int ret = kstrtoul(page, 0, &val);
+
+ if (ret) {
+ pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
+ return ret;
+ }
+ if (val != 0 && val != 1 && val != 3) {
+ pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
+ return -EINVAL;
+ }
+ tl_tpg->tl_fabric_prot_type = val;
+
+ return count;
+}
+
+CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
+
+static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
+ &tcm_loop_tpg_attrib_attr_fabric_prot_type,
+ NULL,
+};
+
+/* Start items for tcm_loop_nexus_cit */
+
+static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
+ struct se_session *se_sess, void *p)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+
+ tl_tpg->tl_nexus = p;
+ return 0;
+}
+
+static int tcm_loop_make_nexus(
+ struct tcm_loop_tpg *tl_tpg,
+ const char *name)
+{
+ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
+ struct tcm_loop_nexus *tl_nexus;
+ int ret;
+
+ if (tl_tpg->tl_nexus) {
+ pr_debug("tl_tpg->tl_nexus already exists\n");
+ return -EEXIST;
+ }
+
+ tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
+ if (!tl_nexus)
+ return -ENOMEM;
+
+ tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
+ TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
+ name, tl_nexus, tcm_loop_alloc_sess_cb);
+ if (IS_ERR(tl_nexus->se_sess)) {
+ ret = PTR_ERR(tl_nexus->se_sess);
+ kfree(tl_nexus);
+ return ret;
+ }
+
+ pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
+ tcm_loop_dump_proto_id(tl_hba), name);
+ return 0;
+}
+
+static int tcm_loop_drop_nexus(
+ struct tcm_loop_tpg *tpg)
+{
+ struct se_session *se_sess;
+ struct tcm_loop_nexus *tl_nexus;
+
+ tl_nexus = tpg->tl_nexus;
+ if (!tl_nexus)
+ return -ENODEV;
+
+ se_sess = tl_nexus->se_sess;
+ if (!se_sess)
+ return -ENODEV;
+
+ if (atomic_read(&tpg->tl_tpg_port_count)) {
+ pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
+ atomic_read(&tpg->tl_tpg_port_count));
+ return -EPERM;
+ }
+
+ pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
+ tcm_loop_dump_proto_id(tpg->tl_hba),
+ tl_nexus->se_sess->se_node_acl->initiatorname);
+ /*
+ * Release the SCSI I_T Nexus to the emulated Target Port
+ */
+ target_remove_session(se_sess);
+ tpg->tl_nexus = NULL;
+ kfree(tl_nexus);
+ return 0;
+}
+
+/* End items for tcm_loop_nexus_cit */
+
+static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_nexus *tl_nexus;
+ ssize_t ret;
+
+ tl_nexus = tl_tpg->tl_nexus;
+ if (!tl_nexus)
+ return -ENODEV;
+
+ ret = snprintf(page, PAGE_SIZE, "%s\n",
+ tl_nexus->se_sess->se_node_acl->initiatorname);
+
+ return ret;
+}
+
+static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
+ unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
+ int ret;
+ /*
+ * Shutdown the active I_T nexus if 'NULL' is passed..
+ */
+ if (!strncmp(page, "NULL", 4)) {
+ ret = tcm_loop_drop_nexus(tl_tpg);
+ return (!ret) ? count : ret;
+ }
+ /*
+ * Otherwise make sure the passed virtual Initiator port WWN matches
+ * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
+ * tcm_loop_make_nexus()
+ */
+ if (strlen(page) >= TL_WWN_ADDR_LEN) {
+ pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
+ page, TL_WWN_ADDR_LEN);
+ return -EINVAL;
+ }
+ snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
+
+ ptr = strstr(i_port, "naa.");
+ if (ptr) {
+ if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
+ pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
+ i_port, tcm_loop_dump_proto_id(tl_hba));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "fc.");
+ if (ptr) {
+ if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
+ pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
+ i_port, tcm_loop_dump_proto_id(tl_hba));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[3]; /* Skip over "fc." */
+ goto check_newline;
+ }
+ ptr = strstr(i_port, "iqn.");
+ if (ptr) {
+ if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
+ pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
+ i_port, tcm_loop_dump_proto_id(tl_hba));
+ return -EINVAL;
+ }
+ port_ptr = &i_port[0];
+ goto check_newline;
+ }
+ pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
+ i_port);
+ return -EINVAL;
+ /*
+ * Clear any trailing newline for the NAA WWN
+ */
+check_newline:
+ if (i_port[strlen(i_port)-1] == '\n')
+ i_port[strlen(i_port)-1] = '\0';
+
+ ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ const char *status = NULL;
+ ssize_t ret = -EINVAL;
+
+ switch (tl_tpg->tl_transport_status) {
+ case TCM_TRANSPORT_ONLINE:
+ status = "online";
+ break;
+ case TCM_TRANSPORT_OFFLINE:
+ status = "offline";
+ break;
+ default:
+ break;
+ }
+
+ if (status)
+ ret = snprintf(page, PAGE_SIZE, "%s\n", status);
+
+ return ret;
+}
+
+static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+
+ if (!strncmp(page, "online", 6)) {
+ tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
+ return count;
+ }
+ if (!strncmp(page, "offline", 7)) {
+ tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
+ if (tl_tpg->tl_nexus) {
+ struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
+
+ core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
+ }
+ return count;
+ }
+ return -EINVAL;
+}
+
+static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
+ char *page)
+{
+ struct se_portal_group *se_tpg = to_tpg(item);
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
+
+ return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
+ tl_hba->sh->host_no, tl_tpg->tl_tpgt);
+}
+
+CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
+CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
+CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
+
+static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
+ &tcm_loop_tpg_attr_nexus,
+ &tcm_loop_tpg_attr_transport_status,
+ &tcm_loop_tpg_attr_address,
+ NULL,
+};
+
+/* Start items for tcm_loop_naa_cit */
+
+static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
+ const char *name)
+{
+ struct tcm_loop_hba *tl_hba = container_of(wwn,
+ struct tcm_loop_hba, tl_hba_wwn);
+ struct tcm_loop_tpg *tl_tpg;
+ int ret;
+ unsigned long tpgt;
+
+ if (strstr(name, "tpgt_") != name) {
+ pr_err("Unable to locate \"tpgt_#\" directory group\n");
+ return ERR_PTR(-EINVAL);
+ }
+ if (kstrtoul(name+5, 10, &tpgt))
+ return ERR_PTR(-EINVAL);
+
+ if (tpgt >= TL_TPGS_PER_HBA) {
+ pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
+ tpgt, TL_TPGS_PER_HBA);
+ return ERR_PTR(-EINVAL);
+ }
+ tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
+ tl_tpg->tl_hba = tl_hba;
+ tl_tpg->tl_tpgt = tpgt;
+ /*
+ * Register the tl_tpg as a emulated TCM Target Endpoint
+ */
+ ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
+ if (ret < 0)
+ return ERR_PTR(-ENOMEM);
+
+ pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
+ tcm_loop_dump_proto_id(tl_hba),
+ config_item_name(&wwn->wwn_group.cg_item), tpgt);
+ return &tl_tpg->tl_se_tpg;
+}
+
+static void tcm_loop_drop_naa_tpg(
+ struct se_portal_group *se_tpg)
+{
+ struct se_wwn *wwn = se_tpg->se_tpg_wwn;
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
+ struct tcm_loop_tpg, tl_se_tpg);
+ struct tcm_loop_hba *tl_hba;
+ unsigned short tpgt;
+
+ tl_hba = tl_tpg->tl_hba;
+ tpgt = tl_tpg->tl_tpgt;
+ /*
+ * Release the I_T Nexus for the Virtual target link if present
+ */
+ tcm_loop_drop_nexus(tl_tpg);
+ /*
+ * Deregister the tl_tpg as a emulated TCM Target Endpoint
+ */
+ core_tpg_deregister(se_tpg);
+
+ tl_tpg->tl_hba = NULL;
+ tl_tpg->tl_tpgt = 0;
+
+ pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
+ tcm_loop_dump_proto_id(tl_hba),
+ config_item_name(&wwn->wwn_group.cg_item), tpgt);
+}
+
+/* End items for tcm_loop_naa_cit */
+
+/* Start items for tcm_loop_cit */
+
+static struct se_wwn *tcm_loop_make_scsi_hba(
+ struct target_fabric_configfs *tf,
+ struct config_group *group,
+ const char *name)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct Scsi_Host *sh;
+ char *ptr;
+ int ret, off = 0;
+
+ tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
+ if (!tl_hba)
+ return ERR_PTR(-ENOMEM);
+
+ /*
+ * Determine the emulated Protocol Identifier and Target Port Name
+ * based on the incoming configfs directory name.
+ */
+ ptr = strstr(name, "naa.");
+ if (ptr) {
+ tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
+ goto check_len;
+ }
+ ptr = strstr(name, "fc.");
+ if (ptr) {
+ tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
+ off = 3; /* Skip over "fc." */
+ goto check_len;
+ }
+ ptr = strstr(name, "iqn.");
+ if (!ptr) {
+ pr_err("Unable to locate prefix for emulated Target Port: %s\n",
+ name);
+ ret = -EINVAL;
+ goto out;
+ }
+ tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
+
+check_len:
+ if (strlen(name) >= TL_WWN_ADDR_LEN) {
+ pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
+ name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
+ ret = -EINVAL;
+ goto out;
+ }
+ snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
+
+ /*
+ * Call device_register(tl_hba->dev) to register the emulated
+ * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
+ * device_register() callbacks in tcm_loop_driver_probe()
+ */
+ ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
+ if (ret)
+ goto out;
+
+ sh = tl_hba->sh;
+ tcm_loop_hba_no_cnt++;
+ pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
+ tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
+ return &tl_hba->tl_hba_wwn;
+out:
+ kfree(tl_hba);
+ return ERR_PTR(ret);
+}
+
+static void tcm_loop_drop_scsi_hba(
+ struct se_wwn *wwn)
+{
+ struct tcm_loop_hba *tl_hba = container_of(wwn,
+ struct tcm_loop_hba, tl_hba_wwn);
+
+ pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
+ tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
+ tl_hba->sh->host_no);
+ /*
+ * Call device_unregister() on the original tl_hba->dev.
+ * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
+ * release *tl_hba;
+ */
+ device_unregister(&tl_hba->dev);
+}
+
+/* Start items for tcm_loop_cit */
+static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
+}
+
+CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
+
+static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
+ &tcm_loop_wwn_attr_version,
+ NULL,
+};
+
+/* End items for tcm_loop_cit */
+
+static const struct target_core_fabric_ops loop_ops = {
+ .module = THIS_MODULE,
+ .name = "loopback",
+ .get_fabric_name = tcm_loop_get_fabric_name,
+ .tpg_get_wwn = tcm_loop_get_endpoint_wwn,
+ .tpg_get_tag = tcm_loop_get_tag,
+ .tpg_check_demo_mode = tcm_loop_check_demo_mode,
+ .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache,
+ .tpg_check_demo_mode_write_protect =
+ tcm_loop_check_demo_mode_write_protect,
+ .tpg_check_prod_mode_write_protect =
+ tcm_loop_check_prod_mode_write_protect,
+ .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
+ .tpg_get_inst_index = tcm_loop_get_inst_index,
+ .check_stop_free = tcm_loop_check_stop_free,
+ .release_cmd = tcm_loop_release_cmd,
+ .sess_get_index = tcm_loop_sess_get_index,
+ .write_pending = tcm_loop_write_pending,
+ .write_pending_status = tcm_loop_write_pending_status,
+ .set_default_node_attributes = tcm_loop_set_default_node_attributes,
+ .get_cmd_state = tcm_loop_get_cmd_state,
+ .queue_data_in = tcm_loop_queue_data_in,
+ .queue_status = tcm_loop_queue_status,
+ .queue_tm_rsp = tcm_loop_queue_tm_rsp,
+ .aborted_task = tcm_loop_aborted_task,
+ .fabric_make_wwn = tcm_loop_make_scsi_hba,
+ .fabric_drop_wwn = tcm_loop_drop_scsi_hba,
+ .fabric_make_tpg = tcm_loop_make_naa_tpg,
+ .fabric_drop_tpg = tcm_loop_drop_naa_tpg,
+ .fabric_post_link = tcm_loop_port_link,
+ .fabric_pre_unlink = tcm_loop_port_unlink,
+ .tfc_wwn_attrs = tcm_loop_wwn_attrs,
+ .tfc_tpg_base_attrs = tcm_loop_tpg_attrs,
+ .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs,
+};
+
+static int __init tcm_loop_fabric_init(void)
+{
+ int ret = -ENOMEM;
+
+ tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
+ if (!tcm_loop_workqueue)
+ goto out;
+
+ tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
+ sizeof(struct tcm_loop_cmd),
+ __alignof__(struct tcm_loop_cmd),
+ 0, NULL);
+ if (!tcm_loop_cmd_cache) {
+ pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
+ goto out_destroy_workqueue;
+ }
+
+ ret = tcm_loop_alloc_core_bus();
+ if (ret)
+ goto out_destroy_cache;
+
+ ret = target_register_template(&loop_ops);
+ if (ret)
+ goto out_release_core_bus;
+
+ return 0;
+
+out_release_core_bus:
+ tcm_loop_release_core_bus();
+out_destroy_cache:
+ kmem_cache_destroy(tcm_loop_cmd_cache);
+out_destroy_workqueue:
+ destroy_workqueue(tcm_loop_workqueue);
+out:
+ return ret;
+}
+
+static void __exit tcm_loop_fabric_exit(void)
+{
+ target_unregister_template(&loop_ops);
+ tcm_loop_release_core_bus();
+ kmem_cache_destroy(tcm_loop_cmd_cache);
+ destroy_workqueue(tcm_loop_workqueue);
+}
+
+MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
+MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
+MODULE_LICENSE("GPL");
+module_init(tcm_loop_fabric_init);
+module_exit(tcm_loop_fabric_exit);
diff --git a/drivers/target/loopback/tcm_loop.h b/drivers/target/loopback/tcm_loop.h
new file mode 100644
index 0000000..d311090
--- /dev/null
+++ b/drivers/target/loopback/tcm_loop.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/types.h>
+#include <linux/device.h>
+#include <target/target_core_base.h> /* struct se_cmd */
+
+#define TCM_LOOP_VERSION "v2.1-rc2"
+#define TL_WWN_ADDR_LEN 256
+#define TL_TPGS_PER_HBA 32
+
+struct tcm_loop_cmd {
+ /* State of Linux/SCSI CDB+Data descriptor */
+ u32 sc_cmd_state;
+ /* Tagged command queueing */
+ u32 sc_cmd_tag;
+ /* Pointer to the CDB+Data descriptor from Linux/SCSI subsystem */
+ struct scsi_cmnd *sc;
+ /* The TCM I/O descriptor that is accessed via container_of() */
+ struct se_cmd tl_se_cmd;
+ struct work_struct work;
+ struct completion tmr_done;
+ /* Sense buffer that will be mapped into outgoing status */
+ unsigned char tl_sense_buf[TRANSPORT_SENSE_BUFFER];
+};
+
+struct tcm_loop_nexus {
+ /*
+ * Pointer to TCM session for I_T Nexus
+ */
+ struct se_session *se_sess;
+};
+
+#define TCM_TRANSPORT_ONLINE 0
+#define TCM_TRANSPORT_OFFLINE 1
+
+struct tcm_loop_tpg {
+ unsigned short tl_tpgt;
+ unsigned short tl_transport_status;
+ enum target_prot_type tl_fabric_prot_type;
+ atomic_t tl_tpg_port_count;
+ struct se_portal_group tl_se_tpg;
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_nexus *tl_nexus;
+};
+
+struct tcm_loop_hba {
+ u8 tl_proto_id;
+ unsigned char tl_wwn_address[TL_WWN_ADDR_LEN];
+ struct se_hba_s *se_hba;
+ struct se_lun *tl_hba_lun;
+ struct se_port *tl_hba_lun_sep;
+ struct device dev;
+ struct Scsi_Host *sh;
+ struct tcm_loop_tpg tl_hba_tpgs[TL_TPGS_PER_HBA];
+ struct se_wwn tl_hba_wwn;
+};