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Roopa Prabhu d297653dd6 rtnetlink: fdb dump: optimize by saving last interface markers 
fdb dumps spanning multiple skb's currently restart from the first
interface again for every skb. This results in unnecessary
iterations on the already visited interfaces and their fdb
entries. In large scale setups, we have seen this to slow
down fdb dumps considerably. On a system with 30k macs we
see fdb dumps spanning across more than 300 skbs.

To fix the problem, this patch replaces the existing single fdb
marker with three markers: netdev hash entries, netdevs and fdb
index to continue where we left off instead of restarting from the
first netdev. This is consistent with link dumps.

In the process of fixing the performance issue, this patch also
re-implements fix done by
commit 472681d57a ("net: ndo_fdb_dump should report -EMSGSIZE to rtnl_fdb_dump")
(with an internal fix from Wilson Kok) in the following ways:
- change ndo_fdb_dump handlers to return error code instead
of the last fdb index
- use cb->args strictly for dump frag markers and not error codes.
This is consistent with other dump functions.

Below results were taken on a system with 1000 netdevs
and 35085 fdb entries:
before patch:
$time bridge fdb show | wc -l
15065

real    1m11.791s
user    0m0.070s
sys 1m8.395s

(existing code does not return all macs)

after patch:
$time bridge fdb show | wc -l
35085

real    0m2.017s
user    0m0.113s
sys 0m1.942s

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Wilson Kok <wkok@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2016-09-01 16:56:15 -07:00
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accessibility
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acpi libnvdimm, nd_blk: mask off reserved status bits 2016-08-08 09:26:13 -07:00
amba
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android
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ata New LED class driver: 2016-07-27 14:03:52 -07:00
atm atm: fore200e: Do not drop const qualifier 2016-08-18 23:46:42 -07:00
auxdisplay
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base More power management updates for v4.8-rc1 2016-08-05 23:26:16 -04:00
bcma wireless-drivers-next patches for 4.8 2016-07-25 11:09:19 -07:00
block Revert "floppy: refactor open() flags handling" 2016-08-25 08:56:51 -06:00
bluetooth Bluetooth: btmrvl: reset is_suspending flag in failure path 2016-07-18 10:13:02 +02:00
bus ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
cdrom cdrom: support read sub-channel command in LBA format 2016-07-12 08:24:50 -07:00
char RTC for 4.8 2016-08-05 09:48:22 -04:00
clk treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
clocksource clocksource/drivers/sun4i: Clear interrupts after stopping timer in probe function 2016-08-26 15:56:01 +02:00
connector
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cpufreq Merge branches 'pm-sleep' and 'pm-cpufreq' 2016-08-12 22:53:58 +02:00
cpuidle powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
crypto chcr: Fix non static symbol warning 2016-08-26 21:45:07 -07:00
dax dax: fix device-dax region base 2016-08-26 17:39:35 -07:00
dca
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devfreq
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dio
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dma dmaengine updates for 4.8-rc1 2016-07-28 15:45:17 -07:00
dma-buf dma-buf: Release module reference on creation failure 2016-07-18 14:10:49 +02:00
edac EDAC, skx_edac: Add EDAC driver for Skylake 2016-08-21 10:58:34 -07:00
eisa
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extcon
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firewire
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firmware efi/capsule: Allocate whole capsule into virtual memory 2016-08-11 13:55:36 +02:00
fmc
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fpga drivers/fpga/Kconfig: fix build failure 2016-08-04 08:50:07 -04:00
gpio gpio: make any OF dependent driver depend on OF_GPIO 2016-08-19 15:01:29 +02:00
gpu drm/atomic: Don't potentially reset color_mgmt_changed on successive property updates. 2016-08-29 06:55:47 +10:00
hid Merge branch 'for-4.8/hid-led' into for-linus 2016-07-28 10:49:23 +02:00
hsi
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hv
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hwmon hwmon: (it87) Add missing sysfs attribute group terminator 2016-08-29 05:31:31 -07:00
hwspinlock hwspinlock: qcom_hwspinlock: add missing of_node_put after calling of_parse_phandle 2016-07-06 12:20:34 -07:00
hwtracing Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-29 13:55:30 -07:00
i2c i2c: meson: Use complete() instead of complete_all() 2016-08-15 00:55:34 +02:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2016-07-29 13:29:06 -07:00
idle Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-07-30 12:56:26 -07:00
iio Third set of IIO new device support, features and cleanups for the 4.8 cycle. 2016-07-14 12:05:29 +09:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-08-30 00:54:02 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2016-08-26 18:36:23 -07:00
iommu Merge branch 'for-joerg/arm-smmu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into iommu/fixes 2016-08-22 12:33:56 +02:00
ipack
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irqchip irqchip/mips-gic: Implement activate op for device domain 2016-08-22 18:37:51 +02:00
isdn
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leds powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
lguest
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lightnvm block: get rid of bio_rw and READA 2016-07-20 17:37:01 -06:00
macintosh drivers/macintosh: Delete owner assignment 2016-08-22 11:09:33 +10:00
mailbox mailbox: Fix format and type mismatches in Broadcom PDC driver 2016-07-28 21:27:31 +05:30
mcb
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md - Another stable fix for DM flakey (that tweaks the previous fix that 2016-08-26 20:15:32 -07:00
media media updates for v4.8-rc1 2016-08-04 09:59:37 -04:00
memory MTD updates for v4.8: 2016-08-02 17:05:11 -04:00
memstick memstick: don't allocate unused major for ms_block 2016-08-02 17:31:41 -04:00
message
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mfd ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
misc cxl: use pcibios_free_controller_deferred() when removing vPHBs 2016-08-22 11:09:33 +10:00
mmc mmc: fix use-after-free of struct request 2016-08-25 14:11:43 -06:00
mtd This pull request contains mostly cleanups and minor 2016-08-04 19:51:49 -04:00
net rtnetlink: fdb dump: optimize by saving last interface markers 2016-09-01 16:56:15 -07:00
nfc NFC 4.8 pull request 2016-07-20 23:39:36 -07:00
ntb NTB: ntb_hw_intel: use local variable pdev 2016-08-05 10:34:13 -04:00
nubus
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nvdimm nvdimm, btt: add a size attribute for BTTs 2016-08-08 09:26:14 -07:00
nvme nvme: Fix nvme_get/set_features() with a NULL result pointer 2016-08-24 08:11:10 -06:00
nvmem
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of of: fix reference counting in of_graph_get_endpoint_by_regs 2016-08-15 11:15:05 -05:00
oprofile
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parisc dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
parport
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pci powerpc fixes for 4.8 #4 2016-08-29 12:12:15 -07:00
pcmcia
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perf drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property 2016-08-09 17:57:39 +01:00
phy MMC core: 2016-07-31 21:36:58 -04:00
pinctrl pinctrl: intel: merrifield: Add missed header 2016-08-10 15:46:28 +02:00
platform intel_pmic_gpio: Make explicitly non-modular 2016-08-28 22:31:52 -07:00
pnp PNP: pnpbios: add header file to fix build errors 2016-07-27 18:52:54 +02:00
power power_supply: tps65217-charger: fix missing platform_set_drvdata() 2016-08-15 23:10:44 +02:00
powercap
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pps pps: do not crash when failed to register 2016-07-23 10:25:54 +09:00
ps3
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ptp
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pwm pwm: Changes for v4.8-rc1 2016-08-06 00:01:33 -04:00
rapidio rapidio: dereferencing an error pointer 2016-08-10 16:40:56 -07:00
ras
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regulator pwm: Changes for v4.8-rc1 2016-08-06 00:01:33 -04:00
remoteproc dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
reset
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rpmsg
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rtc RTC for 4.8 2016-08-05 09:48:22 -04:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-08-16 15:50:22 -07:00
sbus
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scsi Merge remote-tracking branch 'mkp-scsi/4.8/scsi-fixes' into fixes 2016-08-12 16:01:20 -07:00
sfi
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sh
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sn
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soc ARM: SoC driver updates for v4.8 2016-08-01 18:36:01 -04:00
spi ARM: DT updates for v4.8 2016-08-01 18:37:45 -04:00
spmi
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ssb
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staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-08-18 01:17:32 -04:00
target target: iblock_execute_sync_cache() should use bio_set_op_attrs() 2016-08-07 14:41:02 -06:00
tc
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thermal thermal: imx: fix a possible NULL dereference 2016-08-19 21:34:08 +08:00
thunderbolt
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tty tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
uio
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usb xhci: don't dereference a xhci member after removing xhci 2016-08-16 09:42:47 +02:00
uwb
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vfio vfio/pci: Fix NULL pointer oops in error interrupt setup handling 2016-08-08 16:16:23 -06:00
vhost vhost/scsi: fix reuse of &vq->iov[out] in response 2016-08-23 17:16:57 +03:00
video dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
virt
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virtio virtio: fix error handling for debug builds 2016-08-09 13:42:35 +03:00
vlynq
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vme
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w1 w1:omap_hdq: fix regression 2016-08-02 19:35:40 -04:00
watchdog watchdog: gpio_wdt: Fix missing platform_set_drvdata() in gpio_wdt_probe() 2016-07-27 10:47:43 +02:00
xen xenbus: don't look up transaction IDs for ordinary writes 2016-08-24 18:16:18 +01:00
zorro
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Kconfig
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Makefile virtio/vhost: new features for 4.8 2016-08-06 09:20:13 -04:00