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f0c0a376d0
linux/drivers/scsi
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Mike Christie f0c0a376d0 [SCSI] Add helper code so transport classes/driver can control queueing (v3) 
SCSI-ml manages the queueing limits for the device and host, but
does not do so at the target level. However something something similar
can come in userful when a driver is transitioning a transport object to
the the blocked state, becuase at that time we do not want to queue
io and we do not want the queuecommand to be called again.

The patch adds code similar to the exisiting SCSI_ML_*BUSY handlers.
You can now return SCSI_MLQUEUE_TARGET_BUSY when we hit
a transport level queueing issue like the hw cannot allocate some
resource at the iscsi session/connection level, or the target has temporarily
closed or shrunk the queueing window, or if we are transitioning
to the blocked state.

bnx2i, when they rework their firmware according to netdev
developers requests, will also need to be able to limit queueing at this
level. bnx2i will hook into libiscsi, but will allocate a scsi host per
netdevice/hba, so unlike pure software iscsi/iser which is allocating
a host per session, it cannot set the scsi_host->can_queue and return
SCSI_MLQUEUE_HOST_BUSY to reflect queueing limits on the transport.

The iscsi class/driver can also set a scsi_target->can_queue value which
reflects the max commands the driver/class can support. For iscsi this
reflects the number of commands we can support for each session due to
session/connection hw limits, driver limits, and to also reflect the
session/targets's queueing window.

Changes:
v1 - initial patch.
v2 - Fix scsi_run_queue handling of multiple blocked targets.
Previously we would break from the main loop if a device was added back on
the starved list. We now run over the list and check if any target is
blocked.
v3 - Rediff for scsi-misc.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-10-13 09:28:46 -04:00
..
aacraid block: unify request timeout handling 2008-10-09 08:56:13 +02:00
aic7xxx scsi: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
aic7xxx_old
aic94xx [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
arcmsr SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00
arm [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
device_handler [SCSI] scsi_dh: suppress comparison warning 2008-10-03 12:11:51 -05:00
dpt removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
ibmvscsi block: unify request timeout handling 2008-10-09 08:56:13 +02:00
libsas Merge branch 'for-2.6.28' of git://git.kernel.dk/linux-2.6-block 2008-10-10 10:52:45 -07:00
lpfc removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
megaraid block: unify request timeout handling 2008-10-09 08:56:13 +02:00
pcmcia removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
qla2xxx [SCSI] qla2xxx: fix printk format warnings 2008-10-03 11:46:19 -05:00
qla4xxx block: unify request timeout handling 2008-10-09 08:56:13 +02:00
sym53c8xx_2 block: unify request timeout handling 2008-10-09 08:56:13 +02:00
.gitignore [SCSI] 53c7xx: fix removal fallout 2008-01-11 18:22:30 -06:00
3w-9xxx.c [SCSI] 3w-9xxx: add MSI support and misc fixes 2008-07-26 15:15:00 -04:00
3w-9xxx.h [SCSI] 3w-9xxx: add MSI support and misc fixes 2008-07-26 15:15:00 -04:00
3w-xxxx.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
3w-xxxx.h [SCSI] 3ware 8000 serialize reset code 2007-01-06 09:18:00 -06:00
53c700_d.h_shipped
53c700.c [SCSI] Let scsi_cmnd->cmnd use request->cmd buffer 2008-05-02 10:18:22 -05:00
53c700.h [SCSI] 53c700: m68k support for the 53c700 SCSI core 2007-06-17 16:15:56 -05:00
53c700.scr
a100u2w.c Don't crash on IOMMU overflow in A100U2W driver 2008-07-15 14:30:56 -07:00
a100u2w.h [SCSI] a100u2w: Convert into Linux style 2007-06-17 16:09:29 -05:00
a2091.c [SCSI] wd33c93: fix up cut and paste error 2008-04-07 12:19:07 -05:00
a2091.h
a3000.c [SCSI] WD33C93: let platform stub override no_sync/fast/dma_mode 2008-04-07 12:19:01 -05:00
a3000.h
a4000t.c [SCSI] kmalloc + memset conversion to kzalloc 2007-10-12 14:41:00 -04:00
advansys.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
aha152x.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
aha152x.h [SCSI] aha152x: fix debug mode symbol conflict 2007-08-04 09:11:06 -05:00
aha1542.c [SCSI] aha1542: minor irq handler cleanups 2008-04-27 12:19:55 -05:00
aha1542.h
aha1740.c [SCSI] remove use_sg_chaining 2008-01-30 13:14:02 -06:00
aha1740.h
aic7xxx_old.c Remove pointless casts from void pointers 2008-02-06 10:41:01 -08:00
atari_dma_emul.c IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
atari_NCR5380.c [SCSI] atari_NCR5380, sun3_NCR5380: operator precedence fix 2008-01-11 18:28:57 -06:00
atari_scsi.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
atari_scsi.h m68k: Atari SCSI driver compile fixes 2007-05-04 17:59:05 -07:00
atp870u.c scsi: fix integer as NULL pointer warning 2008-05-23 08:11:07 -07:00
atp870u.h
BusLogic.c [SCSI] BusLogic: make FlashPoint support x86-32 only 2008-04-07 12:15:44 -05:00
BusLogic.h [SCSI] BusLogic: make FlashPoint support x86-32 only 2008-04-07 12:15:44 -05:00
bvme6000_scsi.c [SCSI] kmalloc + memset conversion to kzalloc 2007-10-12 14:41:00 -04:00
ch.c [SCSI] ch: fix ch_remove oops 2008-07-26 15:17:47 -04:00
constants.c [SCSI] add support for variable length extended commands 2008-05-02 11:33:25 -05:00
dc395x.c [SCSI] Remove random noop unchecked_isa_dma users 2008-04-07 12:15:40 -05:00
dc395x.h
dmx3191d.c
dpt_i2o.c device create: scsi: convert device_create to device_create_drvdata 2008-07-21 21:54:44 -07:00
dpti.h drivers/scsi/dpt_i2o.c: fix build on alpha 2008-05-08 10:46:56 -07:00
dtc.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
dtc.h
eata_generic.h [SCSI] eata_pio: Remove FALSE/TRUE defines 2007-03-20 11:27:03 -05:00
eata_pio.c [SCSI] Remove random noop unchecked_isa_dma users 2008-04-07 12:15:40 -05:00
eata_pio.h
eata.c [SCSI] aha152x, eata, u14-34f: minor irq handler cleanups 2008-04-25 09:52:30 -05:00
esp_scsi.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-07-15 18:58:04 -07:00
esp_scsi.h sparc: Kill SBUS DVMA layer. 2008-08-29 02:13:10 -07:00
fd_mcs.c [SCSI] fd_mcs: convert to accessors and !use_sg cleanup 2008-01-11 18:22:35 -06:00
fdomain.c scsi: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
fdomain.h
FlashPoint.c [SCSI] FlashPoint: fix off-by-one errors 2008-04-27 12:19:55 -05:00
g_NCR5380_mmio.c
g_NCR5380.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
g_NCR5380.h
gdth_ioctl.h
gdth_proc.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
gdth_proc.h block: unify request timeout handling 2008-10-09 08:56:13 +02:00
gdth.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
gdth.h block: unify request timeout handling 2008-10-09 08:56:13 +02:00
gvp11.c [SCSI] wd33c93: fix up cut and paste error 2008-04-07 12:19:07 -05:00
gvp11.h
hosts.c [SCSI] scsi_host_lookup: error returns and NULL pointers 2008-10-03 11:46:12 -05:00
hptiop.c remove unnecessary <linux/hdreg.h> includes 2008-08-05 18:16:58 +02:00
hptiop.h [SCSI] hptiop: add more adapter models and other fixes 2008-01-11 18:28:06 -06:00
ibmmca.c [SCSI] remove use_sg_chaining 2008-01-30 13:14:02 -06:00
ide-scsi.c ide: Remove ide_spin_wait_hwgroup() and use special requests instead 2008-10-10 22:39:40 +02:00
imm.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
imm.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
in2000.c [SCSI] in2000: convert to accessors and !use_sg cleanup 2008-01-11 18:22:36 -06:00
in2000.h
initio.c [SCSI] Let scsi_cmnd->cmnd use request->cmd buffer 2008-05-02 10:18:22 -05:00
initio.h [SCSI] initio: Convert into a real Linux driver and update to modern style 2007-05-22 11:08:56 -05:00
ipr.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
ipr.h [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
ips.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
ips.h removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
iscsi_tcp.c [SCSI] libiscsi, iscsi_tcp, ib_iser: fix setting of can_queue with old tools. 2008-07-12 08:22:29 -05:00
iscsi_tcp.h [SCSI] iscsi_tcp: handle iscsi_cmd_task rename 2008-07-12 08:22:20 -05:00
jazz_esp.c [SCSI] jazz_esp, sgiwd93, sni_53c710, sun3x_esp: fix platform driver hotplug/coldplug 2008-04-27 12:33:04 -05:00
Kconfig [SCSI] qla2xxx: remove the unused SCSI_QLOGIC_FC_FIRMWARE option 2008-10-03 12:11:51 -05:00
lasi700.c some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
libiscsi.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
libsrp.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
mac53c94.c [SCSI] remove use_sg_chaining 2008-01-30 13:14:02 -06:00
mac53c94.h
mac_esp.c MODULE_LICENSE expects "GPL v2", not "GPLv2" 2008-05-21 16:56:00 -07:00
mac_scsi.c [SCSI] Remove random noop unchecked_isa_dma users 2008-04-07 12:15:40 -05:00
mac_scsi.h
Makefile [SCSI] sd: Support for SCSI disk (SBC) Data Integrity Field 2008-07-26 15:14:56 -04:00
megaraid.c Add a bunch of cycle_kernel_lock() calls 2008-06-20 14:05:53 -06:00
megaraid.h [SCSI] megaraid: fix warnings when CONFIG_PROC_FS=n 2007-05-08 11:15:08 -05:00
mesh.c [SCSI] SCSI: remove dev->power.power_state from mesh driver 2008-06-05 09:23:44 -05:00
mesh.h
mvme16x_scsi.c [SCSI] kmalloc + memset conversion to kzalloc 2007-10-12 14:41:00 -04:00
mvme147.c [SCSI] wd33c93: fix up cut and paste error 2008-04-07 12:19:07 -05:00
mvme147.h
mvsas.c drivers/scsi/mvsas.c: fix printk warnings 2008-05-01 08:04:03 -07:00
ncr53c8xx.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
ncr53c8xx.h [SCSI] ncr53c8xx: Call scsi_host_put in release 2007-10-12 14:51:18 -04:00
NCR53c406a.c [SCSI] remove use_sg_chaining 2008-01-30 13:14:02 -06:00
NCR5380.c [SCSI] NCR5380: fix section mismatch 2008-01-23 13:44:31 -06:00
NCR5380.h [SCSI] NCR5380: Use scsi_eh API for REQUEST_SENSE invocation 2007-10-12 14:55:07 -04:00
NCR_D700.c [SCSI] kmalloc + memset conversion to kzalloc 2007-10-12 14:41:00 -04:00
NCR_D700.h
NCR_Q720.c some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
NCR_Q720.h
nsp32_debug.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
nsp32_io.h
nsp32.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
nsp32.h removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
osst_detect.h
osst_options.h
osst.c Merge commit 'v2.6.26' into bkl-removal 2008-07-14 15:29:34 -06:00
osst.h [SCSI] osst: Use mutex instead of semaphore 2007-10-12 14:50:55 -04:00
pas16.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
pas16.h
ppa.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
ppa.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
ps3rom.c [SCSI] ps3rom: use scsi_build_sense_buffer 2008-04-07 12:19:02 -05:00
ql1040_fw.h
ql1280_fw.h
ql12160_fw.h
qla1280.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
qla1280.h [SCSI] qla1280: eliminate wasted space in request and response ring 2007-10-23 12:35:35 -04:00
qlogicfas408.c [SG] Update drivers to use sg helpers 2007-10-22 21:19:53 +02:00
qlogicfas408.h [SCSI] Scsi_Cmnd conversion in qlogicfas408 driver 2006-10-25 15:11:55 -07:00
qlogicfas.c [SCSI] remove use_sg_chaining 2008-01-30 13:14:02 -06:00
qlogicpti_asm.c [SPARC]: Fix some section mismatch warnings in sparc drivers. 2006-10-17 19:28:51 -07:00
qlogicpti.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-10-11 12:39:35 -07:00
qlogicpti.h qlogicpti: Convert to pure OF driver. 2008-08-29 02:14:46 -07:00
raid_class.c SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00
script_asm.pl
scsi_debug.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
scsi_devinfo.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
scsi_error.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
scsi_ioctl.c [SCSI] sd,sr: add early detection of medium not present 2008-01-11 18:22:50 -06:00
scsi_lib_dma.c [SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA 2007-07-14 19:28:10 -05:00
scsi_lib.c [SCSI] Add helper code so transport classes/driver can control queueing (v3) 2008-10-13 09:28:46 -04:00
scsi_logging.h
scsi_module.c
scsi_netlink.c [SCSI] scsi_netlink: Add transport and LLD recieve and event support 2008-10-03 11:46:13 -05:00
scsi_priv.h block: unify request timeout handling 2008-10-09 08:56:13 +02:00
scsi_proc.c [SCSI] scsi_host_lookup: error returns and NULL pointers 2008-10-03 11:46:12 -05:00
scsi_sas_internal.h SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00
scsi_scan.c [SCSI] Add helper code so transport classes/driver can control queueing (v3) 2008-10-13 09:28:46 -04:00
scsi_sysctl.c [SCSI] small cleanups 2007-07-18 11:16:32 -05:00
scsi_sysfs.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
scsi_tgt_if.c scsi-tgt: BKL pushdown 2008-07-02 15:06:25 -06:00
scsi_tgt_lib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
scsi_tgt_priv.h [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
scsi_transport_api.h
scsi_transport_fc_internal.h [SCSI] fc_transport: add target driver support 2007-10-12 14:46:58 -04:00
scsi_transport_fc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
scsi_transport_iscsi.c [SCSI] scsi_host_lookup: error returns and NULL pointers 2008-10-03 11:46:12 -05:00
scsi_transport_sas.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
scsi_transport_spi.c [SCSI] scsi_transport_spi: fix oops in revalidate 2008-07-30 10:22:39 -05:00
scsi_transport_srp_internal.h [SCSI] scsi_transport_srp: remove tgt dependencies 2007-10-12 14:38:09 -04:00
scsi_transport_srp.c SCSI: convert struct class_device to struct device 2008-04-19 19:10:33 -07:00
scsi_typedefs.h
scsi_wait_scan.c [SCSI] Add ability to scan scsi busses asynchronously 2006-10-11 13:44:25 -05:00
scsi.c [SCSI] Add helper code so transport classes/driver can control queueing (v3) 2008-10-13 09:28:46 -04:00
scsi.h
scsicam.c [SCSI] Add Documentation and integrate into docbook build 2008-01-11 18:22:40 -06:00
sd_dif.c [SCSI] sd: Support for SCSI disk (SBC) Data Integrity Field 2008-07-26 15:14:56 -04:00
sd.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
sd.h Re-introduce "[SCSI] extend the last_sector_bug flag to cover more sectors" 2008-08-05 21:42:21 -07:00
ses.c [SCSI] ses: fix VPD inquiry overrun 2008-07-30 10:21:56 -05:00
sg.c sg: remove unnecessary blk_rq_unmap_user 2008-10-09 08:56:16 +02:00
sgiwd93.c [SCSI] jazz_esp, sgiwd93, sni_53c710, sun3x_esp: fix platform driver hotplug/coldplug 2008-04-27 12:33:04 -05:00
sim710.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-22 11:36:49 -07:00
sni_53c710.c [SCSI] jazz_esp, sgiwd93, sni_53c710, sun3x_esp: fix platform driver hotplug/coldplug 2008-04-27 12:33:04 -05:00
sr_ioctl.c [SCSI] sr: fix test unit ready responses 2008-02-07 18:02:44 -06:00
sr_vendor.c [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
sr.c block: unify request timeout handling 2008-10-09 08:56:13 +02:00
sr.h [SCSI] sr: fix test unit ready responses 2008-02-07 18:02:44 -06:00
st_options.h [SCSI] st: add option to use SILI in variable block reads 2008-04-07 12:15:39 -05:00
st.c [SCSI] st: Remove bogus memset 2008-07-26 15:14:47 -04:00
st.h [SCSI] st: add option to use SILI in variable block reads 2008-04-07 12:15:39 -05:00
stex.c [SCSI] stex: fix queue depth setting 2008-07-26 15:14:49 -04:00
sun3_NCR5380.c [SCSI] atari_NCR5380, sun3_NCR5380: operator precedence fix 2008-01-11 18:28:57 -06:00
sun3_scsi_vme.c [SCSI] sun3_scsi_vme: add MODULE_LICENSE 2008-04-16 09:28:11 -05:00
sun3_scsi.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
sun3_scsi.h [PATCH] Sun3 SCSI: Make sun3 scsi drivers compile/work again 2006-12-09 09:41:18 -08:00
sun3x_esp.c [SCSI] jazz_esp, sgiwd93, sni_53c710, sun3x_esp: fix platform driver hotplug/coldplug 2008-04-27 12:33:04 -05:00
sun_esp.c sparc: Annotate of_device_id arrays with const or __initdata. 2008-08-31 01:23:17 -07:00
sym53c416.c [SCSI] sym53c416: fix module parameters 2008-02-12 15:24:58 -06:00
sym53c416.h
t128.c [SCSI] NCR5380: Fix bugs and canonicalize irq handler usage 2007-11-25 12:19:26 +02:00
t128.h [SCSI] scsi: t128 scsi_cmnd convertion 2006-11-15 16:43:50 -06:00
tmscsim.c [SCSI] tmscsim: Fixup KERN_INFO in printk 2008-10-03 11:46:12 -05:00
tmscsim.h [SCSI] tmscsim: Further clean-up of the driver 2007-07-14 18:56:33 -05:00
u14-34f.c [SCSI] u14-34f: Fix 32bit only problem 2008-05-02 13:18:06 -05:00
ultrastor.c scsi: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
ultrastor.h
wd33c93.c [SCSI] WD33C93: let platform stub override no_sync/fast/dma_mode 2008-04-07 12:19:01 -05:00
wd33c93.h Spelling fix: explicitly 2007-10-19 23:22:55 +02:00
wd7000.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
zalon.c [SCSI] replace __FUNCTION__ with __func__ 2008-07-27 10:31:49 -04:00
zorro7xx.c m68k: zorro7xx needs <asm/amigahw.h> 2007-11-29 09:24:52 -08:00