Michael S. Tsirkin
bab632d69e
vhost: vhost TX zero-copy support ...
>From: Shirley Ma <mashirle@us.ibm.com>
This adds experimental zero copy support in vhost-net,
disabled by default. To enable, set
experimental_zcopytx module option to 1.
This patch maintains the outstanding userspace buffers in the
sequence it is delivered to vhost. The outstanding userspace buffers
will be marked as done once the lower device buffers DMA has finished.
This is monitored through last reference of kfree_skb callback. Two
buffer indices are used for this purpose.
The vhost-net device passes the userspace buffers info to lower device
skb through message control. DMA done status check and guest
notification are handled by handle_tx: in the worst case is all buffers
in the vq are in pending/done status, so we need to notify guest to
release DMA done buffers first before we get any new buffers from the
vq.
One known problem is that if the guest stops submitting
buffers, buffers might never get used until some
further action, e.g. device reset. This does not
seem to affect linux guests.
Signed-off-by: Shirley <xma@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-18 10:42:32 -07:00
lanai: use pci_dev->subsystem_device
2011-07-12 07:59:38 -07:00
mm: Move definition of MIN_MEMORY_BLOCK_SIZE to a header
2011-07-12 11:08:01 +10:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
2011-07-15 10:05:24 -04:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
2011-07-15 10:05:24 -04:00
agp/intel: Fix typo in G4x_GMCH_SIZE_VT_2M
2011-07-13 07:44:27 +01:00
[CPUFREQ] fix cpumask memory leak in acpi-cpufreq on cpu hotplug.
2011-07-10 17:03:04 -04:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
gpio/langwell_gpio: ack the correct bit for langwell gpio interrupts
2011-07-08 09:32:01 -06:00
Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
2011-07-13 14:04:26 -07:00
hwmon: (pmbus) Improve auto-detection of temperature status register
2011-07-10 08:54:29 -07:00
Merge branch 'for-30-rc5/all-i2c' of git://git.fluff.org/bjdooks/linux
2011-07-07 16:29:29 -07:00
net: Abstract dst->neighbour accesses behind helpers.
2011-07-17 23:11:35 -07:00
input: pmic8xxx-pwrkey: Do not use mfd_get_data()
2011-07-05 10:38:43 +02:00
net: Push protocol type directly down to header_ops->cache()
2011-07-13 02:29:59 -07:00
drivers/leds/leds-pca9532.c: change driver name to be unique
2011-07-08 21:14:44 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
w1: ds1wm: add a reset recovery parameter
2011-07-08 21:14:44 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-05 23:23:37 -07:00
net: Abstract dst->neighbour accesses behind helpers.
2011-07-17 23:11:35 -07:00
NFC: pn533: add NXP pn533 nfc device driver
2011-07-05 15:26:58 -04:00
PCI: conditional resource-reallocation through kernel parameter pci=realloc
2011-07-08 15:49:20 -07:00
pcmcia: pxa2xx/vpac270: free gpios on exist rather than requesting
2011-07-11 14:26:34 +08:00
hp-wmi: fix use after free
2011-07-11 09:52:35 -04:00
regulator: max8997: Fix setting inappropriate value for ramp_delay variable
2011-07-08 19:14:58 +01:00
net: Abstract dst->neighbour accesses behind helpers.
2011-07-17 23:11:35 -07:00
net: Abstract dst->neighbour accesses behind helpers.
2011-07-17 23:11:35 -07:00
spi/s3c64xx: Bug fix for SPI with different FIFO level
2011-07-06 15:03:08 +09:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2011-07-14 07:56:40 -07:00
vhost: vhost TX zero-copy support
2011-07-18 10:42:32 -07:00
vesafb: fix memory leak
2011-07-04 16:02:48 +09:00
w1: ds1wm: add a reset recovery parameter
2011-07-08 21:14:44 -07:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
2011-07-08 11:03:36 -04:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
2011-07-08 11:03:36 -04:00
bab632d69e