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0bfe151cc4
linux/drivers
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Olaf Kirch 0bfe151cc4 IB/mthca: Avoid recycling old FMR R_Keys too soon 
When a FMR is unmapped, mthca resets the map count to 0, and clears
the upper part of the R_Key which is used as the sequence counter.

This poses a problem for RDS, which uses ib_fmr_unmap as a fence
operation.  RDS assumes that after issuing an unmap, the old R_Keys
will be invalid for a "reasonable" period of time. For instance,
Oracle processes uses shared memory buffers allocated from a pool of
buffers.  When a process dies, we want to reclaim these buffers -- but
we must make sure there are no pending RDMA operations to/from those
buffers.  The only way to achieve that is by using unmap and sync the
TPT.

However, when the sequence count is reset on unmap, there is a high
likelihood that a new mapping will be given the same R_Key that was
issued a few milliseconds ago.

To prevent this, don't reset the sequence count when unmapping a FMR.

Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2008-04-29 13:46:53 -07:00
..
acorn/char
acpi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-bigbox-pci 2008-04-29 08:26:51 -07:00
amba
ata Fix bug - Implement bfin ata interrupt handler to avoid "irq 68 nobody cared" (v2) 2008-04-29 02:17:18 -04:00
atm drivers: atm, char fix integer as NULL pointer warnings 2008-04-28 17:29:18 -07:00
auxdisplay
base Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-bigbox-pci 2008-04-29 08:26:51 -07:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
bluetooth
cdrom Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
char Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 2008-04-29 11:41:22 -07:00
clocksource
connector
cpufreq [CPUFREQ] state info wrong after resume 2008-04-28 16:27:08 -04:00
cpuidle
crypto
dca
dio
dma
edac edac: fix module initialization on several modules 2nd time 2008-04-29 08:06:26 -07:00
eisa
firewire
firmware edd: add default mode CONFIG_EDD_OFF=n, override with edd={on,off} 2008-04-29 08:06:23 -07:00
gpio gpiochip_reserve() 2008-04-28 08:58:34 -07:00
hid hid-core: use get_unaligned_* helpers 2008-04-29 08:06:27 -07:00
hwmon
i2c
ide Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
ieee1394 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2008-04-25 12:24:06 -07:00
infiniband IB/mthca: Avoid recycling old FMR R_Keys too soon 2008-04-29 13:46:53 -07:00
input input: use get_unaligned_* helpers 2008-04-29 08:06:27 -07:00
isdn isdn: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
leds Remove duplicated unlikely() in IS_ERR() 2008-04-29 08:06:25 -07:00
lguest
macintosh [POWERPC] windfarm: Add PowerMac 12,1 support 2008-04-29 15:57:35 +10:00
mca proc: remove proc_root from drivers 2008-04-29 08:06:18 -07:00
md dm: use unlocked variants of queue flag check/set 2008-04-29 10:21:12 -07:00
media drivers: use non-racy method for proc entries creation (2) 2008-04-29 08:06:22 -07:00
memstick
message Remove duplicated unlikely() in IS_ERR() 2008-04-29 08:06:25 -07:00
mfd mfd: use shorter set_current_state() 2008-04-28 08:58:32 -07:00
misc drivers: use non-racy method for proc entries creation (2) 2008-04-29 08:06:22 -07:00
mmc mmc: use get/put_unaligned_* helpers 2008-04-29 08:06:27 -07:00
mtd drivers: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
net mlx4_core: Avoid recycling old FMR R_Keys too soon 2008-04-29 13:46:53 -07:00
nubus proc: convert /proc/bus/nubus to seq_file interface 2008-04-29 08:06:19 -07:00
of
oprofile oprofile: change cpu_buffer from array to per_cpu variable 2008-04-28 08:58:31 -07:00
parisc parisc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
parport parport_pc: wrap PNP probe code in #ifdef CONFIG_PNP 2008-04-29 08:06:26 -07:00
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-04-29 10:17:59 -07:00
pcmcia drivers/pcmcia/pcmcia_ioctl.c: fix build 2008-04-29 11:00:39 -07:00
pnp drivers: use non-racy method for proc entries creation (2) 2008-04-29 08:06:22 -07:00
power x86: olpc: add One Laptop Per Child architecture support 2008-04-29 08:06:07 -07:00
ps3
rapidio [RAPIDIO] Auto-probe the RapidIO system size 2008-04-29 19:40:28 +10:00
rtc Remove duplicated unlikely() in IS_ERR() 2008-04-29 08:06:25 -07:00
s390 s390: use non-racy method for proc entries creation 2008-04-29 08:06:21 -07:00
sbus
scsi Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
serial Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus 2008-04-28 10:51:43 -07:00
sh
sn
spi spi: spi_imx updates 2008-04-28 08:58:31 -07:00
ssb
tc
telephony
thermal
uio
usb usb: use get/put_unaligned_* helpers 2008-04-29 08:06:28 -07:00
video video: use get/put_unaligned_* helpers 2008-04-29 08:06:28 -07:00
virtio
w1
watchdog
xen
zorro zorro: use non-racy method for proc entries creation 2008-04-29 08:06:21 -07:00
Kconfig
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