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Message-ID: <4BC46BDB.7000208@vlnb.net> Date: Tue, 13 Apr 2010 17:04:27 +0400 From: Vladislav Bolkhovitin <vst@...b.net> To: linux-scsi@...r.kernel.org CC: linux-kernel@...r.kernel.org, scst-devel <scst-devel@...ts.sourceforge.net>, James Bottomley <James.Bottomley@...senPartnership.com>, Andrew Morton <akpm@...ux-foundation.org>, FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>, Mike Christie <michaelc@...wisc.edu>, Jeff Garzik <jeff@...zik.org>, Bart Van Assche <bart.vanassche@...il.com>, James Smart <James.Smart@...lex.Com>, Joe Eykholt <jeykholt@...co.com>, Andy Yan <ayan@...vell.com>, linux-driver@...gic.com, Vu Pham <vuhuong@...lanox.com>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [PATCH][RFC 1/12/1/5] SCST core's Makefile and Kconfig This patch contains SCST core's Makefile and Kconfig. Signed-off-by: Vladislav Bolkhovitin <vst@...b.net> --- Kconfig | 246 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Makefile | 11 ++ 2 files changed, 257 insertions(+) diff -uprN orig/linux-2.6.33/drivers/scst/Kconfig linux-2.6.33/drivers/scst/Kconfig --- orig/linux-2.6.33/drivers/scst/Kconfig +++ linux-2.6.33/drivers/scst/Kconfig @@ -0,0 +1,246 @@ +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_ALLOW_PASSTHROUGH_IO_SUBMIT_IN_SIRQ + bool "Allow pass-through commands to be sent from soft-IRQ context" + depends on SCST + help + Allows SCST to submit SCSI pass-through commands to real SCSI devices + via the SCSI middle layer using scsi_execute_async() function from + soft-IRQ context (tasklets). This used to be the default, but + currently it seems the SCSI middle layer starts expecting only thread + context on the IO submit path, so it is disabled now by default. + Enabling it will decrease amount of context switches and improve + performance. It is more or less safe. In the worst case, if in your + configuration the SCSI middle layer really doesn't expect SIRQ + context in scsi_execute_async() function, you will get a warning + message in the kernel log. + + 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@...ts.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/iscsi-scst/Kconfig" +source "drivers/scst/srpt/Kconfig" + +endmenu diff -uprN orig/linux-2.6.33/drivers/scst/Makefile linux-2.6.33/drivers/scst/Makefile --- orig/linux-2.6.33/drivers/scst/Makefile +++ linux-2.6.33/drivers/scst/Makefile @@ -0,0 +1,11 @@ +ccflags-y += -Iinclude/scst -Wno-unused-parameter + +scst-y += scst_main.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/ iscsi-scst/ srpt/ + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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