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scsi: target: Add virtual remote target 

Create virtual remote target module.

This can be used to see a whole ACL/LUN/TPG configuration from all nodes in
storage cluster.  For example, it permits setting up remote ports in ALUA
port groups. To report all ports in a cluster in REPORT TARGET PORT GROUP
command.

Suggested-by: Konstantin Shelekhin <k.shelekhin@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Link: https://lore.kernel.org/r/20230313181110.20566-13-d.bogdanov@yadro.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Dmitry Bogdanov 2023-03-13 21:11:10 +03:00 committed by Martin K. Petersen
parent df02beb9af
commit 075a5d3561
6 changed files with 300 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/target/Kconfig
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@ -47,5 +47,6 @@ source "drivers/target/loopback/Kconfig"
source "drivers/target/tcm_fc/Kconfig"
source "drivers/target/iscsi/Kconfig"
source "drivers/target/sbp/Kconfig"
source "drivers/target/tcm_remote/Kconfig"
endif

1
drivers/target/Makefile
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@ -30,3 +30,4 @@ obj-$(CONFIG_LOOPBACK_TARGET) += loopback/
obj-$(CONFIG_TCM_FC) += tcm_fc/
obj-$(CONFIG_ISCSI_TARGET) += iscsi/
obj-$(CONFIG_SBP_TARGET) += sbp/
obj-$(CONFIG_REMOTE_TARGET) += tcm_remote/

8
drivers/target/tcm_remote/Kconfig Normal file
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@ -0,0 +1,8 @@
# SPDX-License-Identifier: GPL-2.0-only
config REMOTE_TARGET
tristate "TCM Virtual Remote target"
depends on SCSI
help
Say Y here to enable the TCM Virtual Remote fabric
That fabric is a dummy fabric to tell TCM about configuration
of TPG/ACL/LUN on peer nodes in a cluster.

2
drivers/target/tcm_remote/Makefile Normal file
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@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_REMOTE_TARGET) += tcm_remote.o

268
drivers/target/tcm_remote/tcm_remote.c Normal file
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@ -0,0 +1,268 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#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_remote.h"
static inline struct tcm_remote_tpg *remote_tpg(struct se_portal_group *se_tpg)
{
return container_of(se_tpg, struct tcm_remote_tpg, remote_se_tpg);
}
static char *tcm_remote_get_endpoint_wwn(struct se_portal_group *se_tpg)
{
/*
* Return the passed NAA identifier for the Target Port
*/
return &remote_tpg(se_tpg)->remote_hba->remote_wwn_address[0];
}
static u16 tcm_remote_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 remote_tpg(se_tpg)->remote_tpgt;
}
static int tcm_remote_dummy_cmd_fn(struct se_cmd *se_cmd)
{
return 0;
}
static void tcm_remote_dummy_cmd_void_fn(struct se_cmd *se_cmd)
{
}
static char *tcm_remote_dump_proto_id(struct tcm_remote_hba *remote_hba)
{
switch (remote_hba->remote_proto_id) {
case SCSI_PROTOCOL_SAS:
return "SAS";
case SCSI_PROTOCOL_SRP:
return "SRP";
case SCSI_PROTOCOL_FCP:
return "FCP";
case SCSI_PROTOCOL_ISCSI:
return "iSCSI";
default:
break;
}
return "Unknown";
}
static int tcm_remote_port_link(
struct se_portal_group *se_tpg,
struct se_lun *lun)
{
pr_debug("TCM_Remote_ConfigFS: Port Link LUN %lld Successful\n",
lun->unpacked_lun);
return 0;
}
static void tcm_remote_port_unlink(
struct se_portal_group *se_tpg,
struct se_lun *lun)
{
pr_debug("TCM_Remote_ConfigFS: Port Unlink LUN %lld Successful\n",
lun->unpacked_lun);
}
static struct se_portal_group *tcm_remote_make_tpg(
struct se_wwn *wwn,
const char *name)
{
struct tcm_remote_hba *remote_hba = container_of(wwn,
struct tcm_remote_hba, remote_hba_wwn);
struct tcm_remote_tpg *remote_tpg;
unsigned long tpgt;
int ret;
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);
}
remote_tpg = &remote_hba->remote_hba_tpgs[tpgt];
remote_tpg->remote_hba = remote_hba;
remote_tpg->remote_tpgt = tpgt;
/*
* Register the remote_tpg as a emulated TCM Target Endpoint
*/
ret = core_tpg_register(wwn, &remote_tpg->remote_se_tpg,
remote_hba->remote_proto_id);
if (ret < 0)
return ERR_PTR(-ENOMEM);
pr_debug("TCM_Remote_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
tcm_remote_dump_proto_id(remote_hba),
config_item_name(&wwn->wwn_group.cg_item), tpgt);
return &remote_tpg->remote_se_tpg;
}
static void tcm_remote_drop_tpg(struct se_portal_group *se_tpg)
{
struct se_wwn *wwn = se_tpg->se_tpg_wwn;
struct tcm_remote_tpg *remote_tpg = container_of(se_tpg,
struct tcm_remote_tpg, remote_se_tpg);
struct tcm_remote_hba *remote_hba;
unsigned short tpgt;
remote_hba = remote_tpg->remote_hba;
tpgt = remote_tpg->remote_tpgt;
/*
* Deregister the remote_tpg as a emulated TCM Target Endpoint
*/
core_tpg_deregister(se_tpg);
remote_tpg->remote_hba = NULL;
remote_tpg->remote_tpgt = 0;
pr_debug("TCM_Remote_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
tcm_remote_dump_proto_id(remote_hba),
config_item_name(&wwn->wwn_group.cg_item), tpgt);
}
static struct se_wwn *tcm_remote_make_wwn(
struct target_fabric_configfs *tf,
struct config_group *group,
const char *name)
{
struct tcm_remote_hba *remote_hba;
char *ptr;
int ret, off = 0;
remote_hba = kzalloc(sizeof(*remote_hba), GFP_KERNEL);
if (!remote_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) {
remote_hba->remote_proto_id = SCSI_PROTOCOL_SAS;
goto check_len;
}
ptr = strstr(name, "fc.");
if (ptr) {
remote_hba->remote_proto_id = SCSI_PROTOCOL_FCP;
off = 3; /* Skip over "fc." */
goto check_len;
}
ptr = strstr(name, "0x");
if (ptr) {
remote_hba->remote_proto_id = SCSI_PROTOCOL_SRP;
off = 2; /* Skip over "0x" */
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;
}
remote_hba->remote_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_remote_dump_proto_id(remote_hba), TL_WWN_ADDR_LEN);
ret = -EINVAL;
goto out;
}
snprintf(&remote_hba->remote_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
pr_debug("TCM_Remote_ConfigFS: Allocated emulated Target %s Address: %s\n",
tcm_remote_dump_proto_id(remote_hba), name);
return &remote_hba->remote_hba_wwn;
out:
kfree(remote_hba);
return ERR_PTR(ret);
}
static void tcm_remote_drop_wwn(struct se_wwn *wwn)
{
struct tcm_remote_hba *remote_hba = container_of(wwn,
struct tcm_remote_hba, remote_hba_wwn);
pr_debug("TCM_Remote_ConfigFS: Deallocating emulated Target %s Address: %s\n",
tcm_remote_dump_proto_id(remote_hba),
remote_hba->remote_wwn_address);
kfree(remote_hba);
}
static ssize_t tcm_remote_wwn_version_show(struct config_item *item, char *page)
{
return sprintf(page, "TCM Remote Fabric module %s\n", TCM_REMOTE_VERSION);
}
CONFIGFS_ATTR_RO(tcm_remote_wwn_, version);
static struct configfs_attribute *tcm_remote_wwn_attrs[] = {
&tcm_remote_wwn_attr_version,
NULL,
};
static const struct target_core_fabric_ops remote_ops = {
.module = THIS_MODULE,
.fabric_name = "remote",
.tpg_get_wwn = tcm_remote_get_endpoint_wwn,
.tpg_get_tag = tcm_remote_get_tag,
.check_stop_free = tcm_remote_dummy_cmd_fn,
.release_cmd = tcm_remote_dummy_cmd_void_fn,
.write_pending = tcm_remote_dummy_cmd_fn,
.queue_data_in = tcm_remote_dummy_cmd_fn,
.queue_status = tcm_remote_dummy_cmd_fn,
.queue_tm_rsp = tcm_remote_dummy_cmd_void_fn,
.aborted_task = tcm_remote_dummy_cmd_void_fn,
.fabric_make_wwn = tcm_remote_make_wwn,
.fabric_drop_wwn = tcm_remote_drop_wwn,
.fabric_make_tpg = tcm_remote_make_tpg,
.fabric_drop_tpg = tcm_remote_drop_tpg,
.fabric_post_link = tcm_remote_port_link,
.fabric_pre_unlink = tcm_remote_port_unlink,
.tfc_wwn_attrs = tcm_remote_wwn_attrs,
};
static int __init tcm_remote_fabric_init(void)
{
return target_register_template(&remote_ops);
}
static void __exit tcm_remote_fabric_exit(void)
{
target_unregister_template(&remote_ops);
}
MODULE_DESCRIPTION("TCM virtual remote target");
MODULE_AUTHOR("Dmitry Bogdanov <d.bogdanov@yadro.com>");
MODULE_LICENSE("GPL");
module_init(tcm_remote_fabric_init);
module_exit(tcm_remote_fabric_exit);

20
drivers/target/tcm_remote/tcm_remote.h Normal file
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@ -0,0 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/types.h>
#include <linux/device.h>
#define TCM_REMOTE_VERSION "v0.1"
#define TL_WWN_ADDR_LEN 256
#define TL_TPGS_PER_HBA 32
struct tcm_remote_tpg {
unsigned short remote_tpgt;
struct se_portal_group remote_se_tpg;
struct tcm_remote_hba *remote_hba;
};
struct tcm_remote_hba {
u8 remote_proto_id;
unsigned char remote_wwn_address[TL_WWN_ADDR_LEN];
struct tcm_remote_tpg remote_hba_tpgs[TL_TPGS_PER_HBA];
struct se_wwn remote_hba_wwn;
};