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OpenCloudOS-Kernel
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Herbert Xu 8a35747a5d macvtap: Limit packet queue length 
Mark Wagner reported OOM symptoms when sending UDP traffic over
a macvtap link to a kvm receiver.

This appears to be caused by the fact that macvtap packet queues
are unlimited in length.  This means that if the receiver can't
keep up with the rate of flow, then we will hit OOM. Of course
it gets worse if the OOM killer then decides to kill the receiver.

This patch imposes a cap on the packet queue length, in the same
way as the tuntap driver, using the device TX queue length.

Please note that macvtap currently has no way of giving congestion
notification, that means the software device TX queue cannot be
used and packets will always be dropped once the macvtap driver
queue fills up.

This shouldn't be a great problem for the scenario where macvtap
is used to feed a kvm receiver, as the traffic is most likely
external in origin so congestion notification can't be applied
anyway.

Of course, if anybody decides to complain about guest-to-guest
UDP packet loss down the track, then we may have to revisit this.

Incidentally, this patch also fixes a real memory leak when
macvtap_get_queue fails.

Chris Wright noticed that for this patch to work, we need a
non-zero TX queue length.  This patch includes his work to change
the default macvtap TX queue length to 500.

Reported-by: Mark Wagner <mwagner@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2010-07-22 13:08:56 -07:00
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accessibility
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acpi Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2010-05-28 16:14:17 -07:00
amba
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ata libata: implement dump_id force param 2010-05-25 19:41:19 -04:00
atm Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
auxdisplay auxdisplay: section cleanup in cfag12864bfb driver 2010-05-25 08:07:09 -07:00
base topology: convert cpu notifier to return encapsulate errno value 2010-05-27 09:12:48 -07:00
block Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
bluetooth drivers: bluetooth: bluecard_cs.c: Fixed include error, changed to linux/io.h 2010-07-01 21:28:14 -07:00
cdrom of: Always use 'struct device.of_node' to get device node pointer. 2010-05-18 16:10:44 -06:00
char drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
clocksource Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-19 17:10:57 -07:00
connector
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cpufreq Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:49:13 -07:00
cpuidle Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2010-05-28 16:14:17 -07:00
crypto Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
dca
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dio
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dma Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2010-05-30 09:12:43 -07:00
edac drivers/edac: convert logging messages direct uses of __FILE__ to %s, __FILE 2010-05-27 09:12:52 -07:00
eisa
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firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2010-05-27 10:22:06 -07:00
firmware sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
gpio gpio: Fix inverted rdc321x gpio data out registers 2010-05-28 01:37:59 +02:00
gpu Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-05-28 16:14:40 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-05-27 09:19:55 -07:00
hwmon hwmon: (lm75) Add support for the Texas Instruments TMP105 2010-05-27 19:59:03 +02:00
i2c Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
ide m68k: amiga - Amiga Gayle IDE platform device conversion 2010-05-26 19:51:09 +02:00
idle intel_idle: native hardware cpuidle driver for latest Intel processors 2010-05-28 14:26:20 -04:00
ieee1394 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2010-05-27 10:22:06 -07:00
ieee802154
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infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2010-05-30 09:12:16 -07:00
input input: Touchscreen driver for TPS6507x 2010-05-28 01:37:38 +02:00
isdn ISDN: hysdn, fix potential NULL dereference 2010-06-26 22:12:02 -07:00
leds leds: Fix leds-gpio openfirmware compile issue 2010-05-28 08:35:27 +01:00
lguest
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macintosh Merge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-05-24 08:01:10 -07:00
mca
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md md: convert cpu notifier to return encapsulate errno value 2010-05-27 09:12:48 -07:00
media Merge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-05-24 08:01:10 -07:00
memstick
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message drivers/message/i2o/i2o_config.c: use memdup_user 2010-05-27 09:12:41 -07:00
mfd mfd: Rename twl5031 sih modules 2010-05-28 01:38:02 +02:00
misc lktdm: add support for hardlockup, softlockup and hung task crashes 2010-05-27 09:12:54 -07:00
mmc drivers/mmc/host: use ERR_CAST 2010-05-27 09:12:40 -07:00
mtd drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
net macvtap: Limit packet queue length 2010-07-22 13:08:56 -07:00
nubus
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of Merge remote branch 'origin' into secretlab/next-devicetree 2010-05-22 00:36:56 -06:00
oprofile
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parisc
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parport m68k: amiga - Parallel port platform device conversion 2010-05-26 19:51:09 +02:00
pci Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-05-28 14:42:18 -07:00
pcmcia Merge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-05-24 08:01:10 -07:00
platform Move N014, N051 and CR620 dmi information to load scm dmi table 2010-05-20 10:16:13 -04:00
pnp
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power Merge git://git.infradead.org/battery-2.6 2010-05-25 08:16:34 -07:00
pps
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ps3
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rapidio rapidio: fix new kernel-doc warnings 2010-05-30 09:02:47 -07:00
regulator mfd: AB3100 register access change to abx500 API 2010-05-28 01:37:45 +02:00
rtc mfd: AB3100 register access change to abx500 API 2010-05-28 01:37:45 +02:00
s390 [S390] dasd: unit check handling during internal cio I/O 2010-05-26 23:27:09 +02:00
sbus Merge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-05-24 08:01:10 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2010-05-27 10:28:11 -07:00
serial pcnet_cs: add new id (TOSHIBA Modem/LAN Card) 2010-06-16 18:10:54 -07:00
sfi SFI: add sysfs interface for SFI tables. 2010-05-27 12:46:20 -04:00
sh sh: simplify WARN usage in SH clock driver 2010-05-13 17:43:11 +09:00
sn
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spi spi/xilinx: Fix compile error 2010-05-25 00:48:24 -06:00
ssb ssb: fix NULL ptr deref when pcihost_wrapper is used 2010-05-28 13:57:01 -04:00
staging Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-05-30 09:11:11 -07:00
tc
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telephony drivers/telephony/ixj.c: use memdup_user 2010-05-27 09:12:42 -07:00
thermal
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uio
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usb drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
uwb
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vhost vhost: avoid pr_err on condition guest can trigger 2010-07-16 12:18:17 +03:00
video drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
virtio Merge branch 'virtio' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus 2010-05-21 17:22:52 -07:00
vlynq vlynq: make whole Kconfig-menu dependant on architecture 2010-05-14 16:59:54 +02:00
w1 sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
watchdog mfd: Change rdc321x resources flags to IORESOURCE_IO 2010-05-28 01:37:52 +02:00
xen xen: fix build when SYSRQ is disabled 2010-05-25 08:07:07 -07:00
zorro sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
Kconfig
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Makefile intel_idle: native hardware cpuidle driver for latest Intel processors 2010-05-28 14:26:20 -04:00