From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Greetings all,
This patch series adds two new features to the TCM v4 data I/O path that
will be included in v4.0.0-rc4 for TCM_Loop (included below in patch #5)
and other WIP HW target mode drivers.
The first patch adds support for TFO->new_cmd_map() / TRANSPORT_NEW_CMD_MAP
which allows fabric modules to use a callback in TCM backstore processing
thread context when doing the second stage setup of a new struct se_cmd
descriptor.
The second patch adds support for greating a struct se_cmd wide
SGL array chain using include/linux/scatterlist.h:sg_chain() from
contigiously allocated struct se_task->task_sg[] arrays. This includes
the use of a trailing padding SGL within struct se_task->task_sg[] to hold
the SGL link to the next struct se_task->task_sg[].
The third and forth patches involve the conversion of two spinlocks
which now may used in interrupt context from __transport_get_lun_for_cmd(),
and makes them use spin_lock_irq() and spin_unlock_irq() and handles a
couple of special cases in target_core_mib.c for reference counting.
And finally the fifth path converts the TCM_Loop virtual SCSI LLD
module to use the new TFO->new_cmd_map() / TRANSPORT_NEW_CMD_MAP, and
removes the original per struct tcm_loop_hba->tl_hba_qobj. This will give
us a nice reduction in context-switches per TCM_Loop I/O now that this
patch removes the original per HBA tcm_loop_processing_thread() overhead
in TCM_Loop v4 code!
Comments are welcome,
Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>
Nicholas Bellinger (6):
tcm: Add support for TRANSPORT_NEW_CMD_MAP
tcm: Add support for struct target_core_fabric_ops->task_sg_chaining
tcm/ramdisk: Add special case for TFO->task_sg_chaining=1 with
RAMDISK_DR
tcm: Convert struct se_node_acl->device_list_lock to spin_*lock_irq()
tcm: Convert struct se_device->dev_status_lock to spin_*lock_irq()
tcm_loop: Convert to use new optimized TFO->new_cmd_map() caller
drivers/target/target_core_device.c | 94 +++++---------
drivers/target/target_core_fabric_configfs.c | 8 +-
drivers/target/target_core_mib.c | 28 ++++-
drivers/target/target_core_rd.c | 45 ++++++-
drivers/target/target_core_tpg.c | 18 ++-
drivers/target/target_core_transport.c | 160 ++++++++++++++++++++++--
drivers/target/target_core_ua.c | 20 ++--
drivers/target/tcm_loop/tcm_loop_configfs.c | 35 +-----
drivers/target/tcm_loop/tcm_loop_core.h | 2 -
drivers/target/tcm_loop/tcm_loop_fabric.c | 61 ---------
drivers/target/tcm_loop/tcm_loop_fabric.h | 2 -
drivers/target/tcm_loop/tcm_loop_fabric_scsi.c | 100 +++++-----------
drivers/target/tcm_loop/tcm_loop_fabric_scsi.h | 2 +-
include/target/target_core_base.h | 11 ++-
include/target/target_core_device.h | 1 -
include/target/target_core_fabric_ops.h | 12 ++
include/target/target_core_tpg.h | 1 +
include/target/target_core_transport.h | 3 +-
18 files changed, 332 insertions(+), 271 deletions(-)
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