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target_core_device.c
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/*******************************************************************************
* Filename: target_core_device.c (based on iscsi_target_device.c)
*
* This file contains the TCM Virtual Device and Disk Transport
* agnostic related functions.
*
* (c) Copyright 2003-2013 Datera, Inc.
*
* Nicholas A. Bellinger <[email protected]>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/net.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/in.h>
#include <linux/export.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
DEFINE_MUTEX(g_device_mutex);
LIST_HEAD(g_device_list);
static struct se_hba *lun0_hba;
/* not static, needed by tpg.c */
struct se_device *g_lun0_dev;
sense_reason_t
transport_lookup_cmd_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
{
struct se_lun *se_lun = NULL;
struct se_session *se_sess = se_cmd->se_sess;
struct se_device *dev;
unsigned long flags;
if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
return TCM_NON_EXISTENT_LUN;
spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
if (se_cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
struct se_dev_entry *deve = se_cmd->se_deve;
deve->total_cmds++;
if ((se_cmd->data_direction == DMA_TO_DEVICE) &&
(deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)) {
pr_err("TARGET_CORE[%s]: Detected WRITE_PROTECTED LUN"
" Access for 0x%08x\n",
se_cmd->se_tfo->get_fabric_name(),
unpacked_lun);
spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
return TCM_WRITE_PROTECTED;
}
if (se_cmd->data_direction == DMA_TO_DEVICE)
deve->write_bytes += se_cmd->data_length;
else if (se_cmd->data_direction == DMA_FROM_DEVICE)
deve->read_bytes += se_cmd->data_length;
se_lun = deve->se_lun;
se_cmd->se_lun = deve->se_lun;
se_cmd->pr_res_key = deve->pr_res_key;
se_cmd->orig_fe_lun = unpacked_lun;
se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
percpu_ref_get(&se_lun->lun_ref);
se_cmd->lun_ref_active = true;
}
spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
if (!se_lun) {
/*
* Use the se_portal_group->tpg_virt_lun0 to allow for
* REPORT_LUNS, et al to be returned when no active
* MappedLUN=0 exists for this Initiator Port.
*/
if (unpacked_lun != 0) {
pr_err("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
" Access for 0x%08x\n",
se_cmd->se_tfo->get_fabric_name(),
unpacked_lun);
return TCM_NON_EXISTENT_LUN;
}
/*
* Force WRITE PROTECT for virtual LUN 0
*/
if ((se_cmd->data_direction != DMA_FROM_DEVICE) &&
(se_cmd->data_direction != DMA_NONE))
return TCM_WRITE_PROTECTED;
se_lun = &se_sess->se_tpg->tpg_virt_lun0;
se_cmd->se_lun = &se_sess->se_tpg->tpg_virt_lun0;
se_cmd->orig_fe_lun = 0;
se_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
percpu_ref_get(&se_lun->lun_ref);
se_cmd->lun_ref_active = true;
}
/* Directly associate cmd with se_dev */
se_cmd->se_dev = se_lun->lun_se_dev;
dev = se_lun->lun_se_dev;
atomic_long_inc(&dev->num_cmds);
if (se_cmd->data_direction == DMA_TO_DEVICE)
atomic_long_add(se_cmd->data_length, &dev->write_bytes);
else if (se_cmd->data_direction == DMA_FROM_DEVICE)
atomic_long_add(se_cmd->data_length, &dev->read_bytes);
return 0;
}
EXPORT_SYMBOL(transport_lookup_cmd_lun);
int transport_lookup_tmr_lun(struct se_cmd *se_cmd, u32 unpacked_lun)
{
struct se_dev_entry *deve;
struct se_lun *se_lun = NULL;
struct se_session *se_sess = se_cmd->se_sess;
struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
unsigned long flags;
if (unpacked_lun >= TRANSPORT_MAX_LUNS_PER_TPG)
return -ENODEV;
spin_lock_irqsave(&se_sess->se_node_acl->device_list_lock, flags);
se_cmd->se_deve = se_sess->se_node_acl->device_list[unpacked_lun];
deve = se_cmd->se_deve;
if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
se_tmr->tmr_lun = deve->se_lun;
se_cmd->se_lun = deve->se_lun;
se_lun = deve->se_lun;
se_cmd->pr_res_key = deve->pr_res_key;
se_cmd->orig_fe_lun = unpacked_lun;
}
spin_unlock_irqrestore(&se_sess->se_node_acl->device_list_lock, flags);
if (!se_lun) {
pr_debug("TARGET_CORE[%s]: Detected NON_EXISTENT_LUN"
" Access for 0x%08x\n",
se_cmd->se_tfo->get_fabric_name(),
unpacked_lun);
return -ENODEV;
}
/* Directly associate cmd with se_dev */
se_cmd->se_dev = se_lun->lun_se_dev;
se_tmr->tmr_dev = se_lun->lun_se_dev;
spin_lock_irqsave(&se_tmr->tmr_dev->se_tmr_lock, flags);
list_add_tail(&se_tmr->tmr_list, &se_tmr->tmr_dev->dev_tmr_list);
spin_unlock_irqrestore(&se_tmr->tmr_dev->se_tmr_lock, flags);
return 0;
}
EXPORT_SYMBOL(transport_lookup_tmr_lun);
/*
* This function is called from core_scsi3_emulate_pro_register_and_move()
* and core_scsi3_decode_spec_i_port(), and will increment &deve->pr_ref_count
* when a matching rtpi is found.
*/
struct se_dev_entry *core_get_se_deve_from_rtpi(
struct se_node_acl *nacl,
u16 rtpi)
{
struct se_dev_entry *deve;
struct se_lun *lun;
struct se_port *port;
struct se_portal_group *tpg = nacl->se_tpg;
u32 i;
spin_lock_irq(&nacl->device_list_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = nacl->device_list[i];
if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
continue;
lun = deve->se_lun;
if (!lun) {
pr_err("%s device entries device pointer is"
" NULL, but Initiator has access.\n",
tpg->se_tpg_tfo->get_fabric_name());
continue;
}
port = lun->lun_sep;
if (!port) {
pr_err("%s device entries device pointer is"
" NULL, but Initiator has access.\n",
tpg->se_tpg_tfo->get_fabric_name());
continue;
}
if (port->sep_rtpi != rtpi)
continue;
atomic_inc(&deve->pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock_irq(&nacl->device_list_lock);
return deve;
}
spin_unlock_irq(&nacl->device_list_lock);
return NULL;
}
int core_free_device_list_for_node(
struct se_node_acl *nacl,
struct se_portal_group *tpg)
{
struct se_dev_entry *deve;
struct se_lun *lun;
u32 i;
if (!nacl->device_list)
return 0;
spin_lock_irq(&nacl->device_list_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = nacl->device_list[i];
if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
continue;
if (!deve->se_lun) {
pr_err("%s device entries device pointer is"
" NULL, but Initiator has access.\n",
tpg->se_tpg_tfo->get_fabric_name());
continue;
}
lun = deve->se_lun;
spin_unlock_irq(&nacl->device_list_lock);
core_disable_device_list_for_node(lun, NULL, deve->mapped_lun,
TRANSPORT_LUNFLAGS_NO_ACCESS, nacl, tpg);
spin_lock_irq(&nacl->device_list_lock);
}
spin_unlock_irq(&nacl->device_list_lock);
array_free(nacl->device_list, TRANSPORT_MAX_LUNS_PER_TPG);
nacl->device_list = NULL;
return 0;
}
void core_update_device_list_access(
u32 mapped_lun,
u32 lun_access,
struct se_node_acl *nacl)
{
struct se_dev_entry *deve;
spin_lock_irq(&nacl->device_list_lock);
deve = nacl->device_list[mapped_lun];
if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
} else {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
}
spin_unlock_irq(&nacl->device_list_lock);
}
/* core_enable_device_list_for_node():
*
*
*/
int core_enable_device_list_for_node(
struct se_lun *lun,
struct se_lun_acl *lun_acl,
u32 mapped_lun,
u32 lun_access,
struct se_node_acl *nacl,
struct se_portal_group *tpg)
{
struct se_port *port = lun->lun_sep;
struct se_dev_entry *deve;
spin_lock_irq(&nacl->device_list_lock);
deve = nacl->device_list[mapped_lun];
/*
* Check if the call is handling demo mode -> explicit LUN ACL
* transition. This transition must be for the same struct se_lun
* + mapped_lun that was setup in demo mode..
*/
if (deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS) {
if (deve->se_lun_acl != NULL) {
pr_err("struct se_dev_entry->se_lun_acl"
" already set for demo mode -> explicit"
" LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
if (deve->se_lun != lun) {
pr_err("struct se_dev_entry->se_lun does"
" match passed struct se_lun for demo mode"
" -> explicit LUN ACL transition\n");
spin_unlock_irq(&nacl->device_list_lock);
return -EINVAL;
}
deve->se_lun_acl = lun_acl;
if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
} else {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
}
spin_unlock_irq(&nacl->device_list_lock);
return 0;
}
deve->se_lun = lun;
deve->se_lun_acl = lun_acl;
deve->mapped_lun = mapped_lun;
deve->lun_flags |= TRANSPORT_LUNFLAGS_INITIATOR_ACCESS;
if (lun_access & TRANSPORT_LUNFLAGS_READ_WRITE) {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_ONLY;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_WRITE;
} else {
deve->lun_flags &= ~TRANSPORT_LUNFLAGS_READ_WRITE;
deve->lun_flags |= TRANSPORT_LUNFLAGS_READ_ONLY;
}
deve->creation_time = get_jiffies_64();
deve->attach_count++;
spin_unlock_irq(&nacl->device_list_lock);
spin_lock_bh(&port->sep_alua_lock);
list_add_tail(&deve->alua_port_list, &port->sep_alua_list);
spin_unlock_bh(&port->sep_alua_lock);
return 0;
}
/* core_disable_device_list_for_node():
*
*
*/
int core_disable_device_list_for_node(
struct se_lun *lun,
struct se_lun_acl *lun_acl,
u32 mapped_lun,
u32 lun_access,
struct se_node_acl *nacl,
struct se_portal_group *tpg)
{
struct se_port *port = lun->lun_sep;
struct se_dev_entry *deve = nacl->device_list[mapped_lun];
/*
* If the MappedLUN entry is being disabled, the entry in
* port->sep_alua_list must be removed now before clearing the
* struct se_dev_entry pointers below as logic in
* core_alua_do_transition_tg_pt() depends on these being present.
*
* deve->se_lun_acl will be NULL for demo-mode created LUNs
* that have not been explicitly converted to MappedLUNs ->
* struct se_lun_acl, but we remove deve->alua_port_list from
* port->sep_alua_list. This also means that active UAs and
* NodeACL context specific PR metadata for demo-mode
* MappedLUN *deve will be released below..
*/
spin_lock_bh(&port->sep_alua_lock);
list_del(&deve->alua_port_list);
spin_unlock_bh(&port->sep_alua_lock);
/*
* Wait for any in process SPEC_I_PT=1 or REGISTER_AND_MOVE
* PR operation to complete.
*/
while (atomic_read(&deve->pr_ref_count) != 0)
cpu_relax();
spin_lock_irq(&nacl->device_list_lock);
/*
* Disable struct se_dev_entry LUN ACL mapping
*/
core_scsi3_ua_release_all(deve);
deve->se_lun = NULL;
deve->se_lun_acl = NULL;
deve->lun_flags = 0;
deve->creation_time = 0;
deve->attach_count--;
spin_unlock_irq(&nacl->device_list_lock);
core_scsi3_free_pr_reg_from_nacl(lun->lun_se_dev, nacl);
return 0;
}
/* core_clear_lun_from_tpg():
*
*
*/
void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg)
{
struct se_node_acl *nacl;
struct se_dev_entry *deve;
u32 i;
spin_lock_irq(&tpg->acl_node_lock);
list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {
spin_unlock_irq(&tpg->acl_node_lock);
spin_lock_irq(&nacl->device_list_lock);
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
deve = nacl->device_list[i];
if (lun != deve->se_lun)
continue;
spin_unlock_irq(&nacl->device_list_lock);
core_disable_device_list_for_node(lun, NULL,
deve->mapped_lun, TRANSPORT_LUNFLAGS_NO_ACCESS,
nacl, tpg);
spin_lock_irq(&nacl->device_list_lock);
}
spin_unlock_irq(&nacl->device_list_lock);
spin_lock_irq(&tpg->acl_node_lock);
}
spin_unlock_irq(&tpg->acl_node_lock);
}
static struct se_port *core_alloc_port(struct se_device *dev)
{
struct se_port *port, *port_tmp;
port = kzalloc(sizeof(struct se_port), GFP_KERNEL);
if (!port) {
pr_err("Unable to allocate struct se_port\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&port->sep_alua_list);
INIT_LIST_HEAD(&port->sep_list);
atomic_set(&port->sep_tg_pt_secondary_offline, 0);
spin_lock_init(&port->sep_alua_lock);
mutex_init(&port->sep_tg_pt_md_mutex);
spin_lock(&dev->se_port_lock);
if (dev->dev_port_count == 0x0000ffff) {
pr_warn("Reached dev->dev_port_count =="
" 0x0000ffff\n");
spin_unlock(&dev->se_port_lock);
return ERR_PTR(-ENOSPC);
}
again:
/*
* Allocate the next RELATIVE TARGET PORT IDENTIFIER for this struct se_device
* Here is the table from spc4r17 section 7.7.3.8.
*
* Table 473 -- RELATIVE TARGET PORT IDENTIFIER field
*
* Code Description
* 0h Reserved
* 1h Relative port 1, historically known as port A
* 2h Relative port 2, historically known as port B
* 3h to FFFFh Relative port 3 through 65 535
*/
port->sep_rtpi = dev->dev_rpti_counter++;
if (!port->sep_rtpi)
goto again;
list_for_each_entry(port_tmp, &dev->dev_sep_list, sep_list) {
/*
* Make sure RELATIVE TARGET PORT IDENTIFIER is unique
* for 16-bit wrap..
*/
if (port->sep_rtpi == port_tmp->sep_rtpi)
goto again;
}
spin_unlock(&dev->se_port_lock);
return port;
}
static void core_export_port(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_port *port,
struct se_lun *lun)
{
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem = NULL;
spin_lock(&dev->se_port_lock);
spin_lock(&lun->lun_sep_lock);
port->sep_tpg = tpg;
port->sep_lun = lun;
lun->lun_sep = port;
spin_unlock(&lun->lun_sep_lock);
list_add_tail(&port->sep_list, &dev->dev_sep_list);
spin_unlock(&dev->se_port_lock);
if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
tg_pt_gp_mem = core_alua_allocate_tg_pt_gp_mem(port);
if (IS_ERR(tg_pt_gp_mem) || !tg_pt_gp_mem) {
pr_err("Unable to allocate t10_alua_tg_pt"
"_gp_member_t\n");
return;
}
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
dev->t10_alua.default_tg_pt_gp);
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
pr_debug("%s/%s: Adding to default ALUA Target Port"
" Group: alua/default_tg_pt_gp\n",
dev->transport->name, tpg->se_tpg_tfo->get_fabric_name());
}
dev->dev_port_count++;
port->sep_index = port->sep_rtpi; /* RELATIVE TARGET PORT IDENTIFIER */
}
/*
* Called with struct se_device->se_port_lock spinlock held.
*/
static void core_release_port(struct se_device *dev, struct se_port *port)
__releases(&dev->se_port_lock) __acquires(&dev->se_port_lock)
{
/*
* Wait for any port reference for PR ALL_TG_PT=1 operation
* to complete in __core_scsi3_alloc_registration()
*/
spin_unlock(&dev->se_port_lock);
if (atomic_read(&port->sep_tg_pt_ref_cnt))
cpu_relax();
spin_lock(&dev->se_port_lock);
core_alua_free_tg_pt_gp_mem(port);
list_del(&port->sep_list);
dev->dev_port_count--;
kfree(port);
}
int core_dev_export(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun)
{
struct se_hba *hba = dev->se_hba;
struct se_port *port;
port = core_alloc_port(dev);
if (IS_ERR(port))
return PTR_ERR(port);
lun->lun_se_dev = dev;
spin_lock(&hba->device_lock);
dev->export_count++;
spin_unlock(&hba->device_lock);
core_export_port(dev, tpg, port, lun);
return 0;
}
void core_dev_unexport(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun)
{
struct se_hba *hba = dev->se_hba;
struct se_port *port = lun->lun_sep;
spin_lock(&lun->lun_sep_lock);
if (lun->lun_se_dev == NULL) {
spin_unlock(&lun->lun_sep_lock);
return;
}
spin_unlock(&lun->lun_sep_lock);
spin_lock(&dev->se_port_lock);
core_release_port(dev, port);
spin_unlock(&dev->se_port_lock);
spin_lock(&hba->device_lock);
dev->export_count--;
spin_unlock(&hba->device_lock);
lun->lun_se_dev = NULL;
}
static void se_release_vpd_for_dev(struct se_device *dev)
{
struct t10_vpd *vpd, *vpd_tmp;
spin_lock(&dev->t10_wwn.t10_vpd_lock);
list_for_each_entry_safe(vpd, vpd_tmp,
&dev->t10_wwn.t10_vpd_list, vpd_list) {
list_del(&vpd->vpd_list);
kfree(vpd);
}
spin_unlock(&dev->t10_wwn.t10_vpd_lock);
}
static u32 se_dev_align_max_sectors(u32 max_sectors, u32 block_size)
{
u32 aligned_max_sectors;
u32 alignment;
/*
* Limit max_sectors to a PAGE_SIZE aligned value for modern
* transport_allocate_data_tasks() operation.
*/
alignment = max(1ul, PAGE_SIZE / block_size);
aligned_max_sectors = rounddown(max_sectors, alignment);
if (max_sectors != aligned_max_sectors)
pr_info("Rounding down aligned max_sectors from %u to %u\n",
max_sectors, aligned_max_sectors);
return aligned_max_sectors;
}
int se_dev_set_max_unmap_lba_count(
struct se_device *dev,
u32 max_unmap_lba_count)
{
dev->dev_attrib.max_unmap_lba_count = max_unmap_lba_count;
pr_debug("dev[%p]: Set max_unmap_lba_count: %u\n",
dev, dev->dev_attrib.max_unmap_lba_count);
return 0;
}
int se_dev_set_max_unmap_block_desc_count(
struct se_device *dev,
u32 max_unmap_block_desc_count)
{
dev->dev_attrib.max_unmap_block_desc_count =
max_unmap_block_desc_count;
pr_debug("dev[%p]: Set max_unmap_block_desc_count: %u\n",
dev, dev->dev_attrib.max_unmap_block_desc_count);
return 0;
}
int se_dev_set_unmap_granularity(
struct se_device *dev,
u32 unmap_granularity)
{
dev->dev_attrib.unmap_granularity = unmap_granularity;
pr_debug("dev[%p]: Set unmap_granularity: %u\n",
dev, dev->dev_attrib.unmap_granularity);
return 0;
}
int se_dev_set_unmap_granularity_alignment(
struct se_device *dev,
u32 unmap_granularity_alignment)
{
dev->dev_attrib.unmap_granularity_alignment = unmap_granularity_alignment;
pr_debug("dev[%p]: Set unmap_granularity_alignment: %u\n",
dev, dev->dev_attrib.unmap_granularity_alignment);
return 0;
}
int se_dev_set_max_write_same_len(
struct se_device *dev,
u32 max_write_same_len)
{
dev->dev_attrib.max_write_same_len = max_write_same_len;
pr_debug("dev[%p]: Set max_write_same_len: %u\n",
dev, dev->dev_attrib.max_write_same_len);
return 0;
}
static void dev_set_t10_wwn_model_alias(struct se_device *dev)
{
const char *configname;
configname = config_item_name(&dev->dev_group.cg_item);
if (strlen(configname) >= 16) {
pr_warn("dev[%p]: Backstore name '%s' is too long for "
"INQUIRY_MODEL, truncating to 16 bytes\n", dev,
configname);
}
snprintf(&dev->t10_wwn.model[0], 16, "%s", configname);
}
int se_dev_set_emulate_model_alias(struct se_device *dev, int flag)
{
if (dev->export_count) {
pr_err("dev[%p]: Unable to change model alias"
" while export_count is %d\n",
dev, dev->export_count);
return -EINVAL;
}
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (flag) {
dev_set_t10_wwn_model_alias(dev);
} else {
strncpy(&dev->t10_wwn.model[0],
dev->transport->inquiry_prod, 16);
}
dev->dev_attrib.emulate_model_alias = flag;
return 0;
}
int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (flag) {
pr_err("dpo_emulated not supported\n");
return -EINVAL;
}
return 0;
}
int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (flag &&
dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
pr_err("emulate_fua_write not supported for pSCSI\n");
return -EINVAL;
}
dev->dev_attrib.emulate_fua_write = flag;
pr_debug("dev[%p]: SE Device Forced Unit Access WRITEs: %d\n",
dev, dev->dev_attrib.emulate_fua_write);
return 0;
}
int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (flag) {
pr_err("ua read emulated not supported\n");
return -EINVAL;
}
return 0;
}
int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (flag &&
dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
pr_err("emulate_write_cache not supported for pSCSI\n");
return -EINVAL;
}
if (dev->transport->get_write_cache) {
pr_warn("emulate_write_cache cannot be changed when underlying"
" HW reports WriteCacheEnabled, ignoring request\n");
return 0;
}
dev->dev_attrib.emulate_write_cache = flag;
pr_debug("dev[%p]: SE Device WRITE_CACHE_EMULATION flag: %d\n",
dev, dev->dev_attrib.emulate_write_cache);
return 0;
}
int se_dev_set_emulate_ua_intlck_ctrl(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1) && (flag != 2)) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (dev->export_count) {
pr_err("dev[%p]: Unable to change SE Device"
" UA_INTRLCK_CTRL while export_count is %d\n",
dev, dev->export_count);
return -EINVAL;
}
dev->dev_attrib.emulate_ua_intlck_ctrl = flag;
pr_debug("dev[%p]: SE Device UA_INTRLCK_CTRL flag: %d\n",
dev, dev->dev_attrib.emulate_ua_intlck_ctrl);
return 0;
}
int se_dev_set_emulate_tas(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (dev->export_count) {
pr_err("dev[%p]: Unable to change SE Device TAS while"
" export_count is %d\n",
dev, dev->export_count);
return -EINVAL;
}
dev->dev_attrib.emulate_tas = flag;
pr_debug("dev[%p]: SE Device TASK_ABORTED status bit: %s\n",
dev, (dev->dev_attrib.emulate_tas) ? "Enabled" : "Disabled");
return 0;
}
int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
/*
* We expect this value to be non-zero when generic Block Layer
* Discard supported is detected iblock_create_virtdevice().
*/
if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
pr_err("Generic Block Discard not supported\n");
return -ENOSYS;
}
dev->dev_attrib.emulate_tpu = flag;
pr_debug("dev[%p]: SE Device Thin Provisioning UNMAP bit: %d\n",
dev, flag);
return 0;
}
int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
{
if ((flag != 0) && (flag != 1)) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
/*
* We expect this value to be non-zero when generic Block Layer
* Discard supported is detected iblock_create_virtdevice().
*/
if (flag && !dev->dev_attrib.max_unmap_block_desc_count) {
pr_err("Generic Block Discard not supported\n");
return -ENOSYS;
}
dev->dev_attrib.emulate_tpws = flag;
pr_debug("dev[%p]: SE Device Thin Provisioning WRITE_SAME: %d\n",
dev, flag);
return 0;
}
int se_dev_set_emulate_caw(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
dev->dev_attrib.emulate_caw = flag;
pr_debug("dev[%p]: SE Device CompareAndWrite (AtomicTestandSet): %d\n",
dev, flag);
return 0;
}
int se_dev_set_emulate_3pc(struct se_device *dev, int flag)
{
if (flag != 0 && flag != 1) {
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
dev->dev_attrib.emulate_3pc = flag;
pr_debug("dev[%p]: SE Device 3rd Party Copy (EXTENDED_COPY): %d\n",
dev, flag);
return 0;
}
int se_dev_set_pi_prot_type(struct se_device *dev, int flag)
{
int rc, old_prot = dev->dev_attrib.pi_prot_type;
if (flag != 0 && flag != 1 && flag != 2 && flag != 3) {
pr_err("Illegal value %d for pi_prot_type\n", flag);
return -EINVAL;
}
if (flag == 2) {
pr_err("DIF TYPE2 protection currently not supported\n");
return -ENOSYS;
}
if (dev->dev_attrib.hw_pi_prot_type) {
pr_warn("DIF protection enabled on underlying hardware,"
" ignoring\n");
return 0;
}
if (!dev->transport->init_prot || !dev->transport->free_prot) {
pr_err("DIF protection not supported by backend: %s\n",
dev->transport->name);
return -ENOSYS;
}
if (!(dev->dev_flags & DF_CONFIGURED)) {
pr_err("DIF protection requires device to be configured\n");
return -ENODEV;
}
if (dev->export_count) {
pr_err("dev[%p]: Unable to change SE Device PROT type while"
" export_count is %d\n", dev, dev->export_count);
return -EINVAL;
}
dev->dev_attrib.pi_prot_type = flag;
if (flag && !old_prot) {
rc = dev->transport->init_prot(dev);
if (rc) {
dev->dev_attrib.pi_prot_type = old_prot;
return rc;
}
} else if (!flag && old_prot) {
dev->transport->free_prot(dev);
}
pr_debug("dev[%p]: SE Device Protection Type: %d\n", dev, flag);
return 0;
}
int se_dev_set_pi_prot_format(struct se_device *dev, int flag)
{
int rc;
if (!flag)
return 0;
if (flag != 1) {
pr_err("Illegal value %d for pi_prot_format\n", flag);
return -EINVAL;
}
if (!dev->transport->format_prot) {
pr_err("DIF protection format not supported by backend %s\n",
dev->transport->name);
return -ENOSYS;
}
if (!(dev->dev_flags & DF_CONFIGURED)) {
pr_err("DIF protection format requires device to be configured\n");
return -ENODEV;
}
if (dev->export_count) {
pr_err("dev[%p]: Unable to format SE Device PROT type while"
" export_count is %d\n", dev, dev->export_count);
return -EINVAL;
}
rc = dev->transport->format_prot(dev);
if (rc)
return rc;
pr_debug("dev[%p]: SE Device Protection Format complete\n", dev);