linux-toradex.git/drivers/vhost/vhost.h, branch v3.7.3

vhost: make vhost work queue visible

2012-07-21T22:22:23+00:00

The vhost work queue allows processing to be done in vhost worker thread
context, which uses the owner process mm.  Access to the vring and guest
memory is typically only possible from vhost worker context so it is
useful to allow work to be queued directly by users.

Currently vhost_net only uses the poll wrappers which do not expose the
work queue functions.  However, for tcm_vhost (vhost_scsi) it will be
necessary to queue custom work.

Signed-off-by: Stefan Hajnoczi 
Cc: Zhi Yong Wu 
Cc: Michael S. Tsirkin 
Cc: Paolo Bonzini 
Signed-off-by: Nicholas Bellinger 
Signed-off-by: Michael S. Tsirkin

vhost: Separate vhost-net features from vhost features

2012-07-21T22:21:53+00:00

In order for other vhost devices to use the VHOST_FEATURES bits the
vhost-net specific bits need to be moved to their own VHOST_NET_FEATURES
constant.

(Asias: Update drivers/vhost/test.c to use VHOST_NET_FEATURES)

Signed-off-by: Stefan Hajnoczi 
Cc: Zhi Yong Wu 
Cc: Michael S. Tsirkin 
Cc: Paolo Bonzini 
Cc: Asias He 
Signed-off-by: Nicholas A. Bellinger 
Signed-off-by: Michael S. Tsirkin

skbuff: struct ubuf_info callback type safety

2012-04-13T17:09:19+00:00

The skb struct ubuf_info callback gets passed struct ubuf_info
itself, not the arg value as the field name and the function signature
seem to imply. Rename the arg field to ctx to match usage,
add documentation and change the callback argument type
to make usage clear and to have compiler check correctness.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: David S. Miller

vhost: fix release path lockdep checks

2012-02-28T07:13:22+00:00

We shouldn't hold any locks on release path. Pass a flag to
vhost_dev_cleanup to use the lockdep info correctly.

Signed-off-by: Michael S. Tsirkin 
Tested-by: Sasha Levin

atomic: use

2011-07-26T23:49:47+00:00

This allows us to move duplicated code in 
(atomic_inc_not_zero() for now) to 

Signed-off-by: Arun Sharma 
Reviewed-by: Eric Dumazet 
Cc: Ingo Molnar 
Cc: David Miller 
Cc: Eric Dumazet 
Acked-by: Mike Frysinger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

vhost: init used ring after backend was set

2011-07-19T10:28:34+00:00

Move the used ring initialization after backend was set. This
makes it possible to disable the backend and tweak the used ring,
then restart. This will also make it possible to log the used ring
write correctly.

Signed-off-by: Jason Wang 
Signed-off-by: Michael S. Tsirkin

vhost: vhost TX zero-copy support

2011-07-18T17:42:32+00:00

>From: Shirley Ma 

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 
Signed-off-by: Michael S. Tsirkin 
Signed-off-by: David S. Miller

vhost: support event index

2011-05-30T01:44:15+00:00

Support the new event index feature. When acked,
utilize it to reduce the # of interrupts sent to the guest.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Rusty Russell

vhost: rcu annotation fixup

2011-02-01T14:48:46+00:00

When built with rcu checks enabled, vhost triggers
bogus warnings as vhost features are read without
dev->mutex sometimes, and private pointer is read
with our kind of rcu where work serves as a
read side critical section.

Fixing it properly is not trivial.
Disable the warnings by stubbing out the checks for now.

Signed-off-by: Michael S. Tsirkin

vhost: fix typos in comment

2010-12-09T13:39:15+00:00

Signed-off-by: Jason Wang 
Signed-off-by: Michael S. Tsirkin