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Steve Wise e998f245c4 RDMA/cxgb3: Doorbell overflow avoidance and recovery 
T3 hardware doorbell FIFO overflows can cause application stalls due
to lost doorbell ring events.  This has been seen when running large
NP IMB alltoall MPI jobs.  The T3 hardware supports an xon/xoff-type
flow control mechanism to help avoid overflowing the HW doorbell FIFO.

This patch uses these interrupts to disable RDMA QP doorbell rings
when we near an overflow condition, and then turn them back on (and
ring all the active QP doorbells) when when the doorbell FIFO empties
out.  In addition if an doorbell ring is dropped by the hardware, the
code will now recover.

Design:

cxgb3:
- enable these DB interrupts
- in the interrupt handler, schedule work tasks to call the ULPs event
  handlers with the new events.
- ring all the qset txqs when an overflow is detected.

iw_cxgb3:
- disable db ringing on all active qps when we get the DB_FULL event
- enable db ringing on all active qps and ring all active dbs when we get
  the DB_EMPTY event
- On DB_DROP event:
       - disable db rings in the event handler
       - delay-schedule a work task which rings and enables the dbs on
         all active qps.
- in post_send and post_recv logic, don't ring the db if it's disabled.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2010-02-24 10:40:28 -08:00
..
accessibility
acpi Merge branch 'bugzilla-14954' into release 2010-01-20 01:26:22 -05:00
amba
ata [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c 2010-02-04 01:04:50 -05:00
atm
auxdisplay
base Revert "sysdev: fix prototype for memory_sysdev_class show/store functions" 2010-01-20 15:02:13 -08:00
block cciss: Make cciss_seq_show handle holes in the h->drv[] array 2010-02-05 13:15:36 +01:00
bluetooth Bluetooth: Fix memory leak in Marvell BT-over-SDIO driver 2010-02-03 19:08:30 -08:00
cdrom
char Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-02-11 14:01:10 -08:00
clocksource
connector connector: Delete buggy notification code. 2010-02-02 15:58:48 -08:00
cpufreq [CPUFREQ] Fix ondemand to not request targets outside policy limits 2010-01-13 10:55:16 -05:00
cpuidle drivers/cpuidle/governors/menu.c: fix undefined reference to `__udivdi3' 2010-01-11 09:34:07 -08:00
crypto crypto: padlock-sha - Add import/export support 2010-02-02 06:50:25 +11:00
dca
dio
dma drivers/dma: Correct NULL test 2010-02-10 12:07:28 -07:00
edac Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp 2010-02-11 14:07:13 -08:00
eisa
firewire firewire: ohci: fix crashes with TSB43AB23 on 64bit systems 2010-01-27 18:24:53 +01:00
firmware
gpio gpio: adp5588-gpio: new driver for ADP5588 GPIO expanders 2010-01-11 09:34:07 -08:00
gpu vgaarb: fix incorrect dereference of userspace pointer. 2010-02-11 14:04:48 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2010-01-13 16:10:13 -08:00
hwmon hwmon: (w83781d) Request I/O ports individually for probing 2010-02-05 19:58:36 +01:00
i2c i2c-tiny-usb: Fix on big-endian systems 2010-02-05 17:48:13 +01:00
ide
idle
ieee1394 firewire, ieee1394: update Kconfig help 2009-12-29 19:58:17 +01:00
ieee802154
infiniband RDMA/cxgb3: Doorbell overflow avoidance and recovery 2010-02-24 10:40:28 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-02-11 14:03:42 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-01-12 20:53:29 -08:00
leds
lguest lguest: fix bug in setting guest GDT entry 2010-01-04 12:33:33 -08:00
macintosh powerpc/macintosh: Make Open Firmware device id constant 2010-01-15 13:26:04 +11:00
mca
md md: fix some lockdep issues between md and sysfs. 2010-02-10 11:26:09 +11:00
media V4L/DVB: dvb-core: fix initialization of feeds list in demux filter 2010-02-08 10:47:17 -02:00
memstick
message [SCSI] mptfusion : mptscsih_abort return value should be SUCCESS instead of value 0. 2010-02-08 13:40:17 -06:00
mfd mfd: Fix asic3 build 2010-01-29 21:03:09 +01:00
misc
mmc mmc_test: block addressed cards 2010-02-11 13:59:42 -08:00
mtd Merge branch 'for-linus' of git://git.infradead.org/ubi-2.6 2010-01-28 12:57:50 -08:00
net RDMA/cxgb3: Doorbell overflow avoidance and recovery 2010-02-24 10:40:28 -08:00
nubus
of
oprofile
parisc
parport parport_pc.c: use correct length in strncmp 2009-12-16 07:20:12 -08:00
pci CS5536: apply pci quirk for BIOS SMBUS bug 2010-02-05 07:36:50 -08:00
pcmcia Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-12-30 13:13:24 -08:00
platform Merge branch 'misc' into release 2010-01-20 01:23:27 -05:00
pnp
power wm97xx_battery: Handle missing platform data gracefully 2010-01-29 17:00:18 +03:00
pps
ps3
rapidio
regulator regulator: Specify REGULATOR_CHANGE_STATUS for WM835x LED constraints 2010-02-01 13:52:44 +00:00
rtc rtc-fm3130: add missing braces 2010-02-02 18:11:21 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2010-02-11 14:05:55 -08:00
sbus bbc_envctrl: Clean up properly if kthread_run() fails. 2010-01-04 15:31:10 -08:00
scsi [SCSI] qla2xxx: Obtain proper host structure during response-queue processing. 2010-02-08 13:45:55 -06:00
serial uartlite: fix crash when using as console 2010-02-02 18:11:22 -08:00
sfi
sh
sn ioc3/ioc4: fix error path on driver registration 2009-12-15 08:53:27 -08:00
spi spi: spi_sh_msiof: Fixed data sampling on the correct edge 2010-02-02 11:29:15 +09:00
ssb
staging Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-02-01 10:46:49 -08:00
tc
telephony Merge branch 'for-next' into for-linus 2009-12-07 18:36:35 +01:00
thermal
uio const: constify remaining dev_pm_ops 2009-12-15 08:53:25 -08:00
usb usb: r8a66597-hcd: Fix up spinlock recursion in root hub polling. 2010-02-05 11:53:28 +09:00
uwb
video imxfb: correct location of callbacks in suspend and resume 2010-02-02 18:11:22 -08:00
virtio virtio: fix section mismatch warnings 2010-01-16 12:15:39 -08:00
vlynq drivers/vlynq/vlynq.c: fix resource size off by 1 error 2009-09-24 07:21:05 -07:00
w1 ds2482: Discard obsolete detect method 2009-10-04 22:53:41 +02:00
watchdog [WATCHDOG] sbc_fitpc2_wdt: fix I/O space access technique. 2010-01-25 19:48:49 +00:00
xen xen: fix hang on suspend. 2010-01-13 10:01:35 +00:00
zorro
Kconfig firewire, ieee1394: update Kconfig help 2009-12-29 19:58:17 +01:00
Makefile