renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-20 19:23:57 +08:00
Code
ed785309c9
linux-next/drivers
History
Jonathan Davies 0c36820e2a xen-netfront: transmit fully GSO-sized packets 
xen-netfront limits transmitted skbs to be at most 44 segments in size. However,
GSO permits up to 65536 bytes, which means a maximum of 45 segments of 1448
bytes each. This slight reduction in the size of packets means a slight loss in
efficiency.

Since c/s 9ecd1a75d, xen-netfront sets gso_max_size to
    XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER,
where XEN_NETIF_MAX_TX_SIZE is 65535 bytes.

The calculation used by tcp_tso_autosize (and also tcp_xmit_size_goal since c/s
6c09fa09d) in determining when to split an skb into two is
    sk->sk_gso_max_size - 1 - MAX_TCP_HEADER.

So the maximum permitted size of an skb is calculated to be
    (XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER) - 1 - MAX_TCP_HEADER.

Intuitively, this looks like the wrong formula -- we don't need two TCP headers.
Instead, there is no need to deviate from the default gso_max_size of 65536 as
this already accommodates the size of the header.

Currently, the largest skb transmitted by netfront is 63712 bytes (44 segments
of 1448 bytes each), as observed via tcpdump. This patch makes netfront send
skbs of up to 65160 bytes (45 segments of 1448 bytes each).

Similarly, the maximum allowable mtu does not need to subtract MAX_TCP_HEADER as
it relates to the size of the whole packet, including the header.

Fixes: 9ecd1a75d9 ("xen-netfront: reduce gso_max_size to account for max TCP header")
Signed-off-by: Jonathan Davies <jonathan.davies@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-02 16:18:58 -04:00
..
accessibility
acpi Revert "x86/PCI: Refine the way to release PCI IRQ resources" 2015-03-20 14:56:19 +01:00
amba ARM: 8256/1: driver coamba: add device binding path 'driver_override' 2015-02-10 10:23:15 +00:00
android android: binder: fix binder mmap failures 2015-03-01 18:43:51 -08:00
ata libata: Blacklist queued TRIM on Samsung SSD 850 Pro 2015-03-27 15:22:46 -04:00
atm
auxdisplay
base regmap: Fix for v4.0 2015-03-24 16:42:54 -07:00
bcma
block NVMe: Initialize device list head before starting 2015-03-23 09:35:12 -06:00
bluetooth Bluetooth: btusb: Fix issue with CSR based Intel Wireless controllers 2015-02-23 09:30:35 +02:00
bus ARM: SoC platform changes 2015-02-17 09:27:54 -08:00
cdrom
char Not entirely surprising: the ongoing QEMU work on virtio 1.0 has revealed 2015-03-17 10:36:01 -07:00
clk The clk fixes for 4.0-rc4 comprise three themes. First are the usual 2015-03-15 15:07:08 -07:00
clocksource clocksource/drivers/sun5i: Fix cpufreq interaction with sched_clock() 2015-03-26 10:59:40 +01:00
connector
coresight coresight: fix function etm_writel_cp14() parameter order 2015-02-04 10:42:55 -08:00
cpufreq Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal 2015-03-06 13:43:33 -08:00
cpuidle cpuidle: mvebu: Update cpuidle thresholds for Armada XP SOCs 2015-03-13 18:31:29 +01:00
crypto Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
dca
devfreq Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools' 2015-02-13 21:39:06 +01:00
dio
dma dmaengine: moxart-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
dma-buf
edac * A fix to sb_edac for proper detection on SNB machines 2015-02-19 11:18:14 -08:00
eisa
extcon
firewire firewire: core: use correct vendor/model IDs 2015-02-02 21:56:03 +01:00
firmware * Fix regression in DMI sysfs code for handling "End of Table" entry 2015-03-02 14:18:57 +01:00
fmc
gpio gpio: syscon: reduce message level when direction reg offset not in dt 2015-03-27 11:17:08 +01:00
gpu drm/i915: Fixup legacy plane->crtc link for initial fb config 2015-03-26 13:39:04 +02:00
hid HID: wacom: check for wacom->shared before following the pointer 2015-03-17 20:59:55 +01:00
hsi
hv Char / Misc patches for 3.20-rc1 2015-02-15 10:48:44 -08:00
hwmon hwmon: (ads7828) Check return value of devm_regmap_init_i2c 2015-02-22 20:10:30 -08:00
hwspinlock
i2c Revert "i2c: core: Dispose OF IRQ mapping at client removal time" 2015-03-12 10:23:05 +01:00
ide ide_tape: convert jiffies with jiffies_to_msecs 2015-03-18 23:25:57 -04:00
idle intel_idle: Add ->enter_freeze callbacks 2015-02-15 19:40:09 +01:00
iio Second round of IIO fixes for the 4.0 cycle (or round one part two really!) 2015-02-28 07:19:27 -08:00
infiniband IB/mlx4: Saturate RoCE port PMA counters in case of overflow 2015-03-18 15:17:11 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-03-19 16:43:10 -07:00
iommu iommu/vt-d: Remove unused variable 2015-03-24 15:39:26 +01:00
ipack
irqchip Merge branch 'irqchip/urgent-gic' into irqchip/urgent 2015-03-15 01:41:26 +00:00
isdn isdn: icn: use strlcpy() when parsing setup options 2015-03-15 22:24:37 -04:00
leds leds: leds-gpio: Pass on error codes unmodified 2015-02-02 14:36:10 -08:00
lguest lguest: now needs PCI_DIRECT. 2015-04-01 10:29:05 -07:00
macintosh
mailbox Merge branch 'mailbox-devel' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-02-11 12:56:40 -08:00
mcb mcb: Fix error path of mcb_pci_probe 2015-02-03 15:48:51 -08:00
md . Fix DM core device cleanup regression -- due to a latent race that was 2015-03-26 14:53:47 -07:00
media mm: gup: use get_user_pages_unlocked 2015-02-11 17:06:05 -08:00
memory memory/fsl-corenet-cf: Add t1040 support 2015-01-29 22:57:43 -06:00
memstick
message i2o: move to staging 2015-02-03 15:58:39 -08:00
mfd mfd: kempld-core: Fix callback return value check 2015-03-12 09:27:58 +00:00
misc mei: make device disabled on stop unconditionally 2015-03-01 19:34:50 -08:00
mmc mmc: pwrseq_simple: fix error path in mmc_pwrseq_simple_alloc 2015-03-19 11:26:35 +01:00
mtd This pull request fixes a bug introduced during the v4.0 merge window where we 2015-03-21 10:36:44 -07:00
net xen-netfront: transmit fully GSO-sized packets 2015-04-02 16:18:58 -04:00
nfc NFC: nci: Move NFCEE discovery logic 2015-02-04 09:15:18 +01:00
ntb
nubus
of Revert "of: Fix premature bootconsole disable with 'stdout-path'" 2015-03-19 08:46:54 -05:00
oprofile
parisc
parport
pci PCI updates for v4.0: 2015-03-12 09:45:46 -07:00
pcmcia Revert "pcmcia: add a new resource manager for non ISA systems" 2015-03-11 14:21:23 +01:00
phy phy: omap-usb2: Fix missing clk_prepare call when using old dt name 2015-03-13 17:14:39 +05:30
pinctrl pinctrl: sun4i: GPIOs configured as irq must be set to input before reading 2015-03-18 10:56:46 +01:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 11:12:07 -08:00
pnp Merge branches 'pnp', 'pm-cpuidle' and 'pm-cpufreq' 2015-02-21 04:29:16 +01:00
power
powercap powercap / RAPL: handle domains with different energy units 2015-03-13 23:18:44 +01:00
pps
ps3
ptp
pwm pwm: tegra: Use NSEC_PER_SEC 2015-02-18 08:40:29 +01:00
rapidio Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-02-18 08:49:20 -08:00
ras
regulator Merge remote-tracking branches 'regulator/fix/doc' and 'regulator/fix/palmas' into regulator-linus 2015-03-23 11:43:42 -07:00
remoteproc
reset
rpmsg virtio_rpmsg: set DRIVER_OK before using device 2015-03-13 15:55:42 +10:30
rtc drivers/rtc/rtc-mrst: fix suspend/resume 2015-03-25 16:20:30 -07:00
s390 s390/dcss: array index 'i' is used before limits check. 2015-02-26 09:24:48 +01:00
sbus
scsi Merge branch 'for-4.0-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-03-24 17:08:29 -07:00
sfi
sh drivers: sh: Disable PM runtime for multi-platform r8a7740 with genpd 2015-02-24 07:26:12 +09:00
sn
soc ARM: SoC driver updates 2015-02-17 09:38:59 -08:00
spi Merge remote-tracking branches 'spi/fix/dw', 'spi/fix/queue' and 'spi/fix/qup' into spi-linus 2015-03-24 10:38:44 -07:00
spmi
ssb treewide: Remove unnecessary SSB_DEVTABLE_END macro 2015-02-11 14:38:29 -08:00
staging vt6655: Fix late setting of byRFType. 2015-03-09 11:33:13 +01:00
target target: do not reject FUA CDBs when write cache is enabled but emulate_write_cache is 0 2015-03-19 23:26:46 -07:00
tc
thermal thermal: Make sysfs attributes of cooling devices default attributes 2015-03-05 01:47:57 -04:00
thunderbolt
tty serial: 8250_dw: Fix deadlock in LCR workaround 2015-03-11 16:39:52 +01:00
uio
usb USB / PHY driver fixes for 4.0-rc5 2015-03-22 11:33:55 -07:00
uwb USB patches for 3.20-rc1 2015-02-15 10:24:55 -08:00
vfio vfio-pci: Add missing break to enable VFIO_PCI_ERR_IRQ_INDEX 2015-03-12 09:51:38 -06:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
video OMAPDSS: fix regression with display sysfs files 2015-02-26 10:23:15 +02:00
virt
virtio virtio_mmio: fix access width for mmio 2015-03-17 12:12:21 +10:30
vlynq
vme
w1
watchdog watchdog: imgpdc: Fix default heartbeat 2015-03-27 08:47:50 +01:00
xen Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-03-21 11:24:38 -07:00
zorro
Kconfig i2o: move to staging 2015-02-03 15:58:39 -08:00
Makefile