linux-toradex.git/include/target, branch v7.0-rc6

scsi: target: core: Add emulation for REPORT IDENTIFYING INFORMATION

2025-12-17T02:07:22+00:00

Add emulation for REPORT IDENTIFYING INFORMATION command using the
configfs file 'pd_text_id_info' in target core module. The configfs file
is created in /sys/kernel/config/target/core//
/wwn/.

An emulation function, spc_emulate_report_id_info(), is defined to
return the identification string based on the contents of
'pd_text_id_info'.

The details of the REPORT IDENTIFYING INFORMATION command is defined in
section 6.32 of SPC4.

[mkp: checkpatch tweaks]

Signed-off-by: Gulam Mohamed 
Reviewed-by: John Garry 
Link: https://patch.msgid.link/20251201110716.227588-1-gulam.mohamed@oracle.com
Signed-off-by: Martin K. Petersen

Merge patch series "target: RW/num_cmds stats improvements"

2025-11-03T03:07:27+00:00

Mike Christie  says:

The following patches were made over Linus tree. They fix/improve the
stats used in the main IO path. The first patch fixes an issue where
I made some stats u32 when they should have stayed u64. The rest of
the patches improve the handling of RW/num_cmds stats to reduce code
duplication and improve performance.

Link: https://patch.msgid.link/20250917221338.14813-1-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Move LUN stats to per-CPU

2025-11-03T03:06:12+00:00

The atomic use in the main I/O path is causing perf issues when using
higher performance backend devices and multiple queues (more than
10 when using vhost-scsi) like with this fio workload:

[global]
bs=4K
iodepth=128
direct=1
ioengine=libaio
group_reporting
time_based
runtime=120
name=standard-iops
rw=randread
numjobs=16
cpus_allowed=0-15

To fix this issue, move the LUN stats to per CPU.

Note: I forgot to include this patch with the delayed/ordered per CPU
tracking and per device/device entry per CPU stats. With this patch you
get the full 33% improvements when using fast backends, multiple queues
and multiple IO submiters.

Signed-off-by: Mike Christie 
Reviewed-by: Dmitry Bogdanov 
Link: https://patch.msgid.link/20250917221338.14813-4-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Fix LUN/device R/W and total command stats

2025-11-03T03:06:11+00:00

In commit 9cf2317b795d ("scsi: target: Move I/O path stats to per CPU")
I saw we sometimes use %u and also misread the spec. As a result I
thought all the stats were supposed to be 32-bit only. However, for the
majority of cases we support currently, the spec specifies u64 bit
stats. This patch converts the stats changed in the commit above to u64.

Fixes: 9cf2317b795d ("scsi: target: Move I/O path stats to per CPU")
Signed-off-by: Mike Christie 
Reviewed-by: Dmitry Bogdanov 
Link: https://patch.msgid.link/20250917221338.14813-2-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Add WRITE_ATOMIC_16 handler

2025-11-03T02:40:02+00:00

Add the core LIO code to process the WRITE_ATOMIC_16 command.

Signed-off-by: Mike Christie 
jpg: fix return code from sbc_check_atomic, reformat
Signed-off-by: John Garry 
Link: https://patch.msgid.link/20251020103820.2917593-5-john.g.garry@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Add helper to set up atomic values from block_device

2025-11-03T02:40:01+00:00

Add a helper function that sets up the atomic value based on a
block_device similar to what we do for unmap.

Signed-off-by: Mike Christie 
jpg: Set atomic alignment, drop atomic_supported reference
Signed-off-by: John Garry 
Link: https://patch.msgid.link/20251020103820.2917593-4-john.g.garry@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Add atomic se_device fields

2025-11-03T02:40:01+00:00

Add atomic fields to the se_device and export them in configfs.

Initially only target_core_iblock will be supported and we will inherit
all the settings from the block layer.

Signed-off-by: Mike Christie 
jpg: Stop being allowed to configure atomic write alignment,
Signed-off-by: John Garry 
Link: https://patch.msgid.link/20251020103820.2917593-3-john.g.garry@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: Rename target_configure_unmap_from_queue()

2025-11-03T02:40:01+00:00

Rename target_configure_unmap_from_queue() to
target_configure_unmap_from_bdev() since it now takes a bdev.

Signed-off-by: Mike Christie 
Signed-off-by: John Garry 
Reviewed-by: John Garry 
Link: https://patch.msgid.link/20251020103820.2917593-2-john.g.garry@oracle.com
Signed-off-by: Martin K. Petersen

scsi: target: core: Constify enabled() in struct target_opcode_descriptor

2025-05-21T02:11:03+00:00

Constify the first argument of the enabled() function in struct
target_opcode_descriptor.

This is the first step in order to constify struct
target_opcode_descriptor.

Signed-off-by: Christophe JAILLET 
Link: https://lore.kernel.org/r/4290cf1dbe100c1b1edf2ede5e5aef19b04ee7f2.1747592774.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Martin K. Petersen

scsi: target: Move delayed/ordered tracking to per CPU

2025-04-29T01:47:55+00:00

The atomic use from the delayed/ordered tracking is causing perf issues
when using higher perf backend devices and multiple queues.  This moves
the values to a per CPU counter. Combined with the per CPU stats patch,
this improves IOPS by up to 33% for 8K IOS when using 4 or more queues
from the initiator.

Signed-off-by: Mike Christie 
Link: https://lore.kernel.org/r/20250424032741.16216-3-michael.christie@oracle.com
Reviewed-by: Hannes Reinecke 
Signed-off-by: Martin K. Petersen