/*******************************************************************************
*
* 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;
}
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 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,
.dma_boundary = PAGE_SIZE - 1,
.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 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_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,
.fabric_name = "loopback",
.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,
.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);