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Tom Herbert dfd8645ea1 vxlan: Remote checksum offload 
Add support for remote checksum offload in VXLAN. This uses a
reserved bit to indicate that RCO is being done, and uses the low order
reserved eight bits of the VNI to hold the start and offset values in a
compressed manner.

Start is encoded in the low order seven bits of VNI. This is start >> 1
so that the checksum start offset is 0-254 using even values only.
Checksum offset (transport checksum field) is indicated in the high
order bit in the low order byte of the VNI. If the bit is set, the
checksum field is for UDP (so offset = start + 6), else checksum
field is for TCP (so offset = start + 16). Only TCP and UDP are
supported in this implementation.

Remote checksum offload for VXLAN is described in:

https://tools.ietf.org/html/draft-herbert-vxlan-rco-00

Tested by running 200 TCP_STREAM connections with VXLAN (over IPv4).

With UDP checksums and Remote Checksum Offload
  IPv4
      Client
        11.84% CPU utilization
      Server
        12.96% CPU utilization
      9197 Mbps
  IPv6
      Client
        12.46% CPU utilization
      Server
        14.48% CPU utilization
      8963 Mbps

With UDP checksums, no remote checksum offload
  IPv4
      Client
        15.67% CPU utilization
      Server
        14.83% CPU utilization
      9094 Mbps
  IPv6
      Client
        16.21% CPU utilization
      Server
        14.32% CPU utilization
      9058 Mbps

No UDP checksums
  IPv4
      Client
        15.03% CPU utilization
      Server
        23.09% CPU utilization
      9089 Mbps
  IPv6
      Client
        16.18% CPU utilization
      Server
        26.57% CPU utilization
       8954 Mbps

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-14 15:20:04 -05:00
..
accessibility
acpi Merge branch 'acpi-video' 2014-12-29 21:24:13 +01:00
amba Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
android
ata More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
atm atm: horizon: Remove some unused functions 2015-01-13 17:28:19 -05:00
auxdisplay
base Merge branches 'pm-domains', 'powercap' and 'pm-tools' 2014-12-29 21:24:00 +01:00
bcma Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-12-11 17:56:37 -08:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-12-17 16:03:12 -08:00
bluetooth Bluetooth: btusb: Set the HCI_QUIRK_BROKEN_LOCAL_COMMANDS quirk 2014-12-26 20:16:13 +02:00
bus Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
cdrom
char ipmi: Fix compile warning with tv_usec 2014-12-30 13:34:36 -06:00
clk GMAC: modify CRU config for Rockchip RK3288 SoCs integrated GMAC 2014-12-31 19:14:18 -05:00
clocksource Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-06 22:29:20 -05:00
connector
coresight
cpufreq Merge branches 'pm-cpufreq' and 'pm-cpuidle' 2014-12-29 21:23:41 +01:00
cpuidle Merge branches 'pm-cpufreq' and 'pm-cpuidle' 2014-12-29 21:23:41 +01:00
crypto Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
dca
devfreq
dio
dma Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
dma-buf
edac Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
eisa
extcon Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
firewire firewire: sbp2: replace card lock by target lock 2014-12-10 20:53:21 +01:00
firmware Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
fmc
gpio Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
gpu Revert "drm/gem: Warn on illegal use of the dumb buffer interface v2" 2014-12-24 13:13:22 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-12-12 10:26:47 -08:00
hsi * misc. fixes in omap-ssi and nokia-modem drivers 2014-12-15 17:33:47 -08:00
hv Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
hwmon Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2014-12-17 10:16:27 -08:00
hwspinlock
i2c Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2014-12-20 13:52:52 -08:00
ide Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
idle
iio Staging patches for 3.19-rc1 2014-12-15 18:06:13 -08:00
infiniband net: rename vlan_tx_* helpers since "tx" is misleading there 2015-01-13 17:51:08 -05:00
input Revert "Input: atmel_mxt_ts - use deep sleep mode when stopped" 2014-12-31 12:59:34 -08:00
iommu Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-19 14:02:02 -08:00
ipack
irqchip Merge branch 'irq-irqdomain-arm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-15 17:30:09 -08:00
isdn mISDN: avoid arch specific __builtin_return_address call 2015-01-13 17:08:21 -05:00
leds More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
lguest virtio: allow finalize_features to fail 2014-12-09 16:32:32 +02:00
macintosh macintosh: therm_pm72: delete deprecated driver 2014-12-19 19:32:47 +01:00
mailbox Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
mcb
md dm: fix missed error code if .end_io isn't implemented by target_type 2014-12-17 12:31:13 -05:00
media More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
memory MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
memstick
message
mfd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-12-30 16:59:59 -08:00
misc powerpc updates for 3.19 batch 2 2014-12-19 12:57:45 -08:00
mmc mmc: core: stop trying to switch width when only one bit is supported 2014-12-29 14:49:28 +01:00
mtd MTD updates for 3.19: 2014-12-17 09:59:26 -08:00
net vxlan: Remote checksum offload 2015-01-14 15:20:04 -05:00
nfc More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
ntb
nubus
of ARM: SoC/iommu configuration for 3.19 2014-12-16 14:53:01 -08:00
oprofile
parisc
parport Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
pci Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-19 14:02:02 -08:00
pcmcia Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
phy phy: miphy365x: Pass sysconfig register offsets via syscfg dt property. 2015-01-11 18:53:34 -05:00
pinctrl Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
platform platform-drivers-x86 for 3.19 2014-12-18 20:24:55 -08:00
pnp
power More ACPI and power management updates for 3.19-rc1 2014-12-18 20:28:33 -08:00
powercap powercap / RAPL: add IDs for future Xeon CPUs 2014-12-17 02:35:42 +01:00
pps
ps3
ptp
pwm pwm: Changes for v3.19-rc1 2014-12-17 10:10:51 -08:00
rapidio
ras
regulator regulator: Fix for v3.19 2014-12-29 13:24:38 -08:00
remoteproc Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
reset Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
rpmsg
rtc Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
s390 net: rename vlan_tx_* helpers since "tx" is misleading there 2015-01-13 17:51:08 -05:00
sbus
scsi iw_cxgb4/cxgb4/cxgb4vf/cxgb4i/csiostor: Cleanup register defines/macros related to all other cpl messages 2015-01-12 16:19:34 -05:00
sfi
sh drivers: sh / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM 2014-12-05 03:08:24 +01:00
sn
soc Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2014-12-15 15:52:01 -08:00
spi Merge remote-tracking branches 'spi/fix/img-spfi' and 'spi/fix/msiof' into spi-linus 2014-12-24 12:57:54 +00:00
spmi
ssb Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-12-11 17:56:37 -08:00
staging [regression] braino in "lustre: use is_root_inode()" 2014-12-26 22:43:19 -05:00
target SCSI for-linus on 20141220 2014-12-20 13:42:57 -08:00
tc
thermal Merge branches 'thermal-core', 'thermal-soc' and 'thermal-int340x' of .git into next 2014-12-24 10:38:30 +08:00
thunderbolt
tty tty: 8250_omap: Replace CONFIG_PM_RUNTIME with CONFIG_PM 2014-12-19 15:27:58 +01:00
uio Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
usb SCSI for-linus on 20141220 2014-12-20 13:42:57 -08:00
uwb
vfio VFIO updates for v3.19-rc1 2014-12-17 10:44:22 -08:00
vhost net: rename vlan_tx_* helpers since "tx" is misleading there 2015-01-13 17:51:08 -05:00
video OMAPDSS: SDI: fix output port_num 2014-12-30 11:18:30 +02:00
virt
virtio vhost/virtio: virtio 1.0 related fixes 2014-12-18 20:50:30 -08:00
vlynq
vme
w1 Char/Misc driver patches for 3.19-rc1 2014-12-14 16:43:47 -08:00
watchdog watchdog: imx2_wdt: Fix the argument of watchdog_active() 2014-12-18 16:01:20 +01:00
xen Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus 2014-12-18 05:56:29 -08:00
zorro
Kconfig Staging patches for 3.19-rc1 2014-12-15 18:06:13 -08:00
Makefile Staging patches for 3.19-rc1 2014-12-15 18:06:13 -08:00