From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Greeting SCSI folks,
This patch series to lio-core-2.6.git/lio-4.0 adds a generic set of SAS, FC and iSCSI
ProtoID and PR TransportID I_T handlers in target_core_fabric.c following existing code
in TCM_Loop, TCM_FC and LIO-Target fabric code to allow a TCM fabric module to function
in both default single-protocol and the new optional multi-protocol fabric module.
Using this new common code, the TCM_Loop fabric module has been converted to allow for
run-time selectable CDB level fabric emulation of ProtoID and Transport I_T Nexus naming
information in a per configfs context at /sys/kernel/config/target/loopback/$WWN to individually
emulated I_T Nexuses under TCM_Loop module defined SCSI target endpoints. This allows for
multi-fabric SCSI protocol naming information to be made available using the TCM_Loop LLD for
locally accessable Linux/SCSI struct scsi_devices and SG_IO.
So far this code has been tested on v2.6.37-rc7 with loopback Linux/SCSI struct scsi_devices
providing CDB emulation of different target port fabric naming with the above three SCSI protocols.
Using SG_IO backstores with a slightly modified version of STGT/iSCSI is also now
running with control path CDBs that allow TCM PR and ALUA emulation to function into STGT
userspace fabric ports..! Here is a quick rundown of how the TCM_Loop + SG_IO + STGT/iSCSI
setup is looking with the series so far:
*) TCM_Loop fabric layout with single LVM IBLOCK backstore using emulated iSCSI I_T Nexus
root@target:~ tree /sys/kernel/config/target/loopback
/sys/kernel/config/target/loopback
|-- discovery_auth
|-- iqn.foo.test123
| `-- tpgt_1
| |-- acls
| |-- attrib
| |-- lun
| | |-- lun_0
| | | |-- alua_tg_pt_gp
| | | |-- alua_tg_pt_offline
| | | |-- alua_tg_pt_status
| | | |-- alua_tg_pt_write_md
| | | `-- virtual_scsi_port -> ../../../../../../target/core/iblock_0/lvm_test0
| |-- nexus
| |-- np
| `-- param
`-- version
root@target:~ cat /sys/kernel/config/target/loopback/*/*/nexus
iqn.1993-08.org.debian:01:2dadf92d0ef
*) STGT calls to export TCM_Loop LLD provided /dev/sg7 (see below) as a
userspace iSCSI target port as LUN=1
tgtadm --lld iscsi --mode target --op new --tid 1 -T iqn.foo.test123
tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 -E sg --backing-store=/dev/sg7
tgtadm --lld iscsi --mode target --op bind --tid 1 -I ALL
tgtadm --lld iscsi --mode target --op show
Target 1: iqn.foo.test123
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.1993-08.org.debian:01:2dadf92d0ef
Connection: 0
IP Address: 172.16.201.129
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB
Online: Yes
Removable media: No
Backing store type: rdwr
Backing store path: None
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 0 MB
Online: Yes
Removable media: No
Backing store type: sg
Backing store path: /dev/sg7
Account information:
ACL information:
ALL
*) iSCSI Initiator side LUN output with IET controller LUN=0:
root@ubuntu:~# lsscsi
<SNIP>
[46:0:0:0] storage IET Controller 0001 -
[46:0:0:1] disk LIO-ORG IBLOCK 3.1 /dev/sdf
root@ubuntu:~# lsscsi --transport
<SNIP>
[46:0:0:0] storage iqn.foo.test123,t,0x1 -
[46:0:0:1] disk iqn.foo.test123,t,0x1 /dev/sdf
*) iSCSI Initiator side INQUIRY EVPD 0x83 output for STGT userspace prots reference
the kernel level emulated TCM_Loop I_T Nexus information:
root@ubuntu:~# sg_inq -i /dev/sdf
<SNIP>
Designation descriptor number 6, descriptor length: 32
transport: Internet SCSI (iSCSI)
id_type: SCSI name string, code_set: UTF-8
associated with the target port
SCSI name string:
iqn.foo.test123,t,0x0001
*) From the iSCSI Initiator, set the ALUA access state for the userspace STGT
target port to Active/NonOptimized:
root@ubuntu:~# sg_stpg -v --state=1 --tp=0 /dev/sdf
set target port groups cdb: a4 0a 00 00 00 00 00 00 00 08 00 00
root@ubuntu:~# sg_rtpg --decode /dev/sdf
Report target port groups:
target port group id : 0x0 , Pref=0
target port group asymmetric access state : 0x01 (active/non optimized)
T_SUP : 1, O_SUP : 1, U_SUP : 1, S_SUP : 1, AN_SUP : 1, AO_SUP : 1
status code : 0x01 (target port asym. state changed by SET TARGET PORT GROUPS command)
vendor unique status : 0x00
target port count : 01
Relative target port ids:
0x01
*) TCM side kernel ring buffer messages:
Target_Core_ConfigFS: REGISTER -> group: e0c42000 name: loopback
Initialized TCM Loop Core Bus
Setup generic discovery
Setup generic wwn
Setup generic tpg
Setup generic tpg_base
Setup generic tpg_port
Setup generic tpg_lun
Setup generic tpg_np
Setup generic tpg_np_base
Setup generic tpg_attrib
Setup generic tpg_param
Setup generic tpg_nacl
Setup generic tpg_nacl_base
Setup generic tpg_nacl_attrib
Setup generic tpg_nacl_auth
Setup generic tpg_nacl_param
Setup generic tpg_mappedlun
<<<<<<<<<<<<<<<<<<<<<< BEGIN FABRIC API >>>>>>>>>>>>>>>>>>>>>>
Initialized struct target_fabric_configfs: df9a8408 for loopback
<<<<<<<<<<<<<<<<<<<<<< END FABRIC API >>>>>>>>>>>>>>>>>>>>>>
TCM_LOOP[0] - Set fabric -> tcm_loop_fabric_configfs
Target_Core_ConfigFS: REGISTER -> Located fabric: loopback
Target_Core_ConfigFS: REGISTER tfc_wwn_cit -> df9a85b0
Target_Core_ConfigFS: REGISTER -> Allocated Fabric: loopback
Target_Core_ConfigFS: REGISTER -> Set tf->tf_fabric for loopback
scsi16 : TCM_Loopback
TCM_Loop_ConfigFS: Allocated emulated Target iSCSI Address: iqn.foo.test123 at Linux/SCSI Host ID: 16
TARGET_CORE[loopback]: Allocated Normal se_portal_group_t for endpoint: iqn.foo.test123, Portal Tag: 1
TCM_Loop_ConfigFS: Allocated Emulated iSCSI Target Port iqn.foo.test123,t,0x0001
loopback_TPG[1] - Added DYNAMIC ACL with TCQ Depth: 1 for loopback Initiator Node: iqn.1993-08.org.debian:01:2dadf92d0ef
TARGET_CORE[loopback]: Registered fabric_sess_ptr: deddd648
TCM_Loop_ConfigFS: Established I_T Nexus to emulated iSCSI Initiator Port: iqn.1993-08.org.debian:01:2dadf92d0ef
iblock/loopback: Adding to default ALUA Target Port Group: alua/default_tg_pt_gp
loopback_TPG[1]_LUN[0] - Activated loopback Logical Unit from CORE HBA: 4
TARGET_CORE[loopback]->TPG[1]_LUN[0] - Adding READ-WRITE access for LUN in Demo Mode
scsi 16:0:1:0: Direct-Access LIO-ORG IBLOCK 3.1 PQ: 0 ANSI: 5
sd 16:0:1:0: Attached scsi generic sg7 type 0
TCM_Loop_ConfigFS: Port Link Successful
sd 16:0:1:0: [sdg] 3072000 512-byte logical blocks: (1.57 GB/1.46 GiB)
sd 16:0:1:0: [sdg] Write Protect is off
sd 16:0:1:0: [sdg] Mode Sense: 2f 00 00 00
sd 16:0:1:0: [sdg] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
sdg: unknown partition table
sd 16:0:1:0: [sdg] Attached SCSI disk
Successful explict ALUA transition TG PT Group: default_tg_pt_gp ID: 0 from primary access state Active/NonOptimized to Active/NonOptimized
*) TCM lsmod
Module Size Used by
tcm_loop 11907 6
target_core_mod 250789 28 tcm_loop
scsi_tgt 8650 1 target_core_mod
configfs 20508 2 target_core_mod
dm_mirror 11237 0
dm_region_hash 7906 1 dm_mirror
dm_log 7103 2 dm_mirror,dm_region_hash
dm_snapshot 25880 0
pcnet32 27665 0
mii 3430 1 pcnet32
sg 16603 3
Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx
Nicholas Bellinger (5):
[TCM_Loop]: Add proper HBA defaults to struct Scsi_Host
[TCM]: Add TPG parameter to struct
target_core_fabric_ops->get_fabric_proto_ident()
[TCM]: Add TPG parameter to struct
target_core_fabric_ops->tpg_parse_pr_out_transport_id()
[TCM]: Add generic ProtoID and TransportID fabric handlers for SAS,
FC, and iSCSI
[TCM_Loop]: Add support for multi-fabric CDB level emulation
drivers/target/Kbuild | 1 +
drivers/target/lio-target/iscsi_target.c | 2 +-
drivers/target/lio-target/iscsi_target.h | 2 +-
drivers/target/lio-target/iscsi_target_tpg.c | 1 +
drivers/target/lio-target/iscsi_target_tpg.h | 3 +-
drivers/target/target_core_fabric_lib.c | 456 ++++++++++++++++++++++++
drivers/target/target_core_pr.c | 10 +-
drivers/target/target_core_transport.c | 6 +-
drivers/target/tcm_fc/tfc_conf.c | 5 +-
drivers/target/tcm_loop/tcm_loop_configfs.c | 140 ++++++--
drivers/target/tcm_loop/tcm_loop_core.h | 21 +-
drivers/target/tcm_loop/tcm_loop_fabric.c | 150 +++++---
drivers/target/tcm_loop/tcm_loop_fabric.h | 5 +-
drivers/target/tcm_loop/tcm_loop_fabric_scsi.c | 9 +-
include/target/target_core_fabric_lib.h | 28 ++
include/target/target_core_fabric_ops.h | 5 +-
16 files changed, 727 insertions(+), 117 deletions(-)
create mode 100644 drivers/target/target_core_fabric_lib.c
create mode 100644 include/target/target_core_fabric_lib.h
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