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Subject[PATCH 2/17]: SCST core's Makefile and Kconfig
This patch contains SCST core's Makefile and Kconfig.

Signed-off-by: Vladislav Bolkhovitin <vst@vlnb.net>
---
Kconfig | 243 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Makefile | 11 ++
2 files changed, 254 insertions(+)

diff -uprN orig/linux-2.6.35/drivers/scst/Kconfig linux-2.6.35/drivers/scst/Kconfig
--- orig/linux-2.6.35/drivers/scst/Kconfig
+++ linux-2.6.35/drivers/scst/Kconfig
@@ -0,0 +1,243 @@
+menu "SCSI target (SCST) support"
+
+config SCST
+ tristate "SCSI target (SCST) support"
+ depends on SCSI
+ help
+ SCSI target (SCST) is designed to provide unified, consistent
+ interface between SCSI target drivers and Linux kernel and
+ simplify target drivers development as much as possible. Visit
+ http://scst.sourceforge.net for more info about it.
+
+config SCST_DISK
+ tristate "SCSI target disk support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for disk device.
+
+config SCST_TAPE
+ tristate "SCSI target tape support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for tape device.
+
+config SCST_CDROM
+ tristate "SCSI target CDROM support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for CDROM device.
+
+config SCST_MODISK
+ tristate "SCSI target MO disk support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for MO disk device.
+
+config SCST_CHANGER
+ tristate "SCSI target changer support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for changer device.
+
+config SCST_PROCESSOR
+ tristate "SCSI target processor support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for processor device.
+
+config SCST_RAID
+ tristate "SCSI target storage array controller (RAID) support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST pass-through device handler for raid storage array controller (RAID) device.
+
+config SCST_VDISK
+ tristate "SCSI target virtual disk and/or CDROM support"
+ default SCST
+ depends on SCSI && SCST
+ help
+ SCST device handler for virtual disk and/or CDROM device.
+
+config SCST_STRICT_SERIALIZING
+ bool "Strict serialization"
+ depends on SCST
+ help
+ Enable strict SCSI command serialization. When enabled, SCST sends
+ all SCSI commands to the underlying SCSI device synchronously, one
+ after one. This makes task management more reliable, at the cost of
+ a performance penalty. This is most useful for stateful SCSI devices
+ like tapes, where the result of the execution of a command
+ depends on the device settings configured by previous commands. Disk
+ and RAID devices are stateless in most cases. The current SCSI core
+ in Linux doesn't allow to abort all commands reliably if they have
+ been sent asynchronously to a stateful device.
+ Enable this option if you use stateful device(s) and need as much
+ error recovery reliability as possible.
+
+ If unsure, say "N".
+
+config SCST_STRICT_SECURITY
+ bool "Strict security"
+ depends on SCST
+ help
+ Makes SCST clear (zero-fill) allocated data buffers. Note: this has a
+ significant performance penalty.
+
+ If unsure, say "N".
+
+config SCST_TEST_IO_IN_SIRQ
+ bool "Allow test I/O from soft-IRQ context"
+ depends on SCST
+ help
+ Allows SCST to submit selected SCSI commands (TUR and
+ READ/WRITE) from soft-IRQ context (tasklets). Enabling it will
+ decrease amount of context switches and slightly improve
+ performance. The goal of this option is to be able to measure
+ overhead of the context switches. See more info about it in
+ README.scst.
+
+ WARNING! Improperly used, this option can lead you to a kernel crash!
+
+ If unsure, say "N".
+
+config SCST_ABORT_CONSIDER_FINISHED_TASKS_AS_NOT_EXISTING
+ bool "Send back UNKNOWN TASK when an already finished task is aborted"
+ depends on SCST
+ help
+ Controls which response is sent by SCST to the initiator in case
+ the initiator attempts to abort (ABORT TASK) an already finished
+ request. If this option is enabled, the response UNKNOWN TASK is
+ sent back to the initiator. However, some initiators, particularly
+ the VMware iSCSI initiator, interpret the UNKNOWN TASK response as
+ if the target got crazy and try to RESET it. Then sometimes the
+ initiator gets crazy itself.
+
+ If unsure, say "N".
+
+config SCST_USE_EXPECTED_VALUES
+ bool "Prefer initiator-supplied SCSI command attributes"
+ depends on SCST
+ help
+ When SCST receives a SCSI command from an initiator, such a SCSI
+ command has both data transfer length and direction attributes.
+ There are two possible sources for these attributes: either the
+ values computed by SCST from its internal command translation table
+ or the values supplied by the initiator. The former are used by
+ default because of security reasons. Invalid initiator-supplied
+ attributes can crash the target, especially in pass-through mode.
+ Only consider enabling this option when SCST logs the following
+ message: "Unknown opcode XX for YY. Should you update
+ scst_scsi_op_table?" and when the initiator complains. Please
+ report any unrecognized commands to scst-devel@lists.sourceforge.net.
+
+ If unsure, say "N".
+
+config SCST_EXTRACHECKS
+ bool "Extra consistency checks"
+ depends on SCST
+ help
+ Enable additional consistency checks in the SCSI middle level target
+ code. This may be helpful for SCST developers. Enable it if you have
+ any problems.
+
+ If unsure, say "N".
+
+config SCST_TRACING
+ bool "Tracing support"
+ depends on SCST
+ default y
+ help
+ Enable SCSI middle level tracing support. Tracing can be controlled
+ dynamically via sysfs interface. The traced information
+ is sent to the kernel log and may be very helpful when analyzing
+ the cause of a communication problem between initiator and target.
+
+ If unsure, say "Y".
+
+config SCST_DEBUG
+ bool "Debugging support"
+ depends on SCST
+ select DEBUG_BUGVERBOSE
+ help
+ Enables support for debugging SCST. This may be helpful for SCST
+ developers.
+
+ If unsure, say "N".
+
+config SCST_DEBUG_OOM
+ bool "Out-of-memory debugging support"
+ depends on SCST
+ help
+ Let SCST's internal memory allocation function
+ (scst_alloc_sg_entries()) fail about once in every 10000 calls, at
+ least if the flag __GFP_NOFAIL has not been set. This allows SCST
+ developers to test the behavior of SCST in out-of-memory conditions.
+ This may be helpful for SCST developers.
+
+ If unsure, say "N".
+
+config SCST_DEBUG_RETRY
+ bool "SCSI command retry debugging support"
+ depends on SCST
+ help
+ Let SCST's internal SCSI command transfer function
+ (scst_rdy_to_xfer()) fail about once in every 100 calls. This allows
+ SCST developers to test the behavior of SCST when SCSI queues fill
+ up. This may be helpful for SCST developers.
+
+ If unsure, say "N".
+
+config SCST_DEBUG_SN
+ bool "SCSI sequence number debugging support"
+ depends on SCST
+ help
+ Allows to test SCSI command ordering via sequence numbers by
+ randomly changing the type of SCSI commands into
+ SCST_CMD_QUEUE_ORDERED, SCST_CMD_QUEUE_HEAD_OF_QUEUE or
+ SCST_CMD_QUEUE_SIMPLE for about one in 300 SCSI commands.
+ This may be helpful for SCST developers.
+
+ If unsure, say "N".
+
+config SCST_DEBUG_TM
+ bool "Task management debugging support"
+ depends on SCST_DEBUG
+ help
+ Enables support for debugging of SCST's task management functions.
+ When enabled, some of the commands on LUN 0 in the default access
+ control group will be delayed for about 60 seconds. This will
+ cause the remote initiator send SCSI task management functions,
+ e.g. ABORT TASK and TARGET RESET.
+
+ If unsure, say "N".
+
+config SCST_TM_DBG_GO_OFFLINE
+ bool "Let devices become completely unresponsive"
+ depends on SCST_DEBUG_TM
+ help
+ Enable this option if you want that the device eventually becomes
+ completely unresponsive. When disabled, the device will receive
+ ABORT and RESET commands.
+
+config SCST_MEASURE_LATENCY
+ bool "Commands processing latency measurement facility"
+ depends on SCST
+ help
+ This option enables commands processing latency measurement
+ facility in SCST. It will provide in the sysfs interface
+ average commands processing latency statistics. You can clear
+ already measured results by writing 0 in the corresponding sysfs file.
+ Note, you need a non-preemtible kernel to have correct results.
+
+ If unsure, say "N".
+
+source "drivers/scst/scst_local/Kconfig"
+source "drivers/scst/srpt/Kconfig"
+
+endmenu
diff -uprN orig/linux-2.6.35/drivers/scst/Makefile linux-2.6.35/drivers/scst/Makefile
--- orig/linux-2.6.35/drivers/scst/Makefile
+++ linux-2.6.35/drivers/scst/Makefile
@@ -0,0 +1,11 @@
+ccflags-y += -Wno-unused-parameter
+
+scst-y += scst_main.o
+scst-y += scst_pres.o
+scst-y += scst_targ.o
+scst-y += scst_lib.o
+scst-y += scst_sysfs.o
+scst-y += scst_mem.o
+scst-y += scst_debug.o
+
+obj-$(CONFIG_SCST) += scst.o dev_handlers/ srpt/ scst_local/



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