From: Nicholas Bellinger <n...@linux-iscsi.org> Hi MKP, Sagi, & Co,
This series adds support for internal WRITE_STRIP + READ_INSERT DIX operations using existing target_core_sbc.c DIF emulation. It's useful in order for T10-PI fabrics to interoperate between backend devices that don't have protection available or enabled yet. This should be able to be done both internally using target DIF emulation, or by the fabric driver's own HBA/NIC hardware offloads outside of target_core_mod code. This series includes initial tcm_loop support using a new endpoint 'fabric_prot_type' configfs attribute, and is able to successful register SCSI LUNs and process I/Os in TYPE1 mode against a FILEIO backend with pi_prot_type=0 set. Here's how it looks in action: scsi host6: TCM_Loopback scsi 6:0:1:0: Direct-Access LIO-ORG FILEIO 4.0 PQ: 0 ANSI: 5 sd 6:0:1:0: [sda] Enabling DIF Type 1 protection sd 6:0:1:0: Attached scsi generic sg1 type 0 sd 6:0:1:0: [sda] 4194304 512-byte logical blocks: (2.14 GB/2.00 GiB) sd 6:0:1:0: [sda] Write Protect is off sd 6:0:1:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA sd 6:0:1:0: [sda] Enabling DIX T10-DIF-TYPE1-CRC protection sd 6:0:1:0: [sda] DIF application tag size 2 sd 6:0:1:0: [sda] Attached SCSI disk root@scsi-mq:~# cat /sys/kernel/config/target/loopback/naa.6001405973efc183/tpgt_1/attrib/fabric_prot_type 1 root@scsi-mq:~# cat /sys/kernel/config/target/core/fileio_1/tmpfile/attrib/pi_prot_type 0 Please review as v4.1 material. Thank you, --nab Nicholas Bellinger (9): target: Convert DIF emulation to use cmd->prot_type target: Add protected fabric + unprotected device support target: Update SPC/SBC emulation for sess_prot_type target: Move cmd->prot_op check into target_check_write_prot target: Add internal WRITE_STRIP support target: Move cmd->prot_op check into target_check_read_prot target: Add internal READ_INSERT support target/file: Add checks for backend DIF emulation loopback: Add fabric_prot_type attribute support drivers/target/loopback/tcm_loop.c | 51 ++++++++++++++++++++- drivers/target/loopback/tcm_loop.h | 1 + drivers/target/target_core_file.c | 8 ++-- drivers/target/target_core_sbc.c | 73 ++++++++++++++++++++++-------- drivers/target/target_core_spc.c | 14 +++--- drivers/target/target_core_transport.c | 82 +++++++++++++++++++++++++++------- include/target/target_core_base.h | 1 + include/target/target_core_fabric.h | 8 ++++ 8 files changed, 191 insertions(+), 47 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
