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  1. 09 12月, 2014 2 次提交
  3. 15 10月, 2014 3 次提交
  5. 28 4月, 2014 1 次提交
  7. 29 10月, 2013 2 次提交
  9. 10 7月, 2013 1 次提交
  11. 20 5月, 2013 1 次提交
  13. 22 3月, 2013 1 次提交
  15. 20 3月, 2013 3 次提交
    • R
      virtio_ring: virtqueue_add_outbuf / virtqueue_add_inbuf. · 282edb36
      由 Rusty Russell 提交于 
      These are specialized versions of virtqueue_add_buf(), which cover
over 80% of cases and are far clearer.

In particular, the scatterlists passed to these functions don't have
to be clean (ie. we ignore end markers).
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
      282edb36
    • R
      virtio_ring: virtqueue_add_sgs, to add multiple sgs. · 13816c76
      由 Rusty Russell 提交于 
      virtio_scsi can really use this, to avoid the current hack of copying
the whole sg array.  Some other things get slightly neater, too.

This causes a slowdown in virtqueue_add_buf(), which is implemented as
a wrapper.  This is addressed in the next patches.

for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers:

Before:
	Using CPUS 0 and 3
	Guest: notified 0, pinged 39009-39063(39062)
	Host: notified 39009-39063(39062), pinged 0
	Wall time:1.700000-1.950000(1.723542)

After:
	Using CPUS 0 and 3
	Guest: notified 0, pinged 39062-39063(39063)
	Host: notified 39062-39063(39063), pinged 0
	Wall time:1.760000-2.220000(1.789167)
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Reviewed-by: NWanlong Gao <gaowanlong@cn.fujitsu.com>
Reviewed-by: NAsias He <asias@redhat.com>
      13816c76
    • S
      virtio: Introduce vringh wrappers in virtio_config · 3beee86a
      由 Sjur Brændeland 提交于 
      Add wrappers for the host vrings to support loose
coupling between the virtio device and driver.

A new struct vringh_config_ops with the functions
find_vrhs() and del_vrhs() is added to the virtio_device
struct. This enables virtio drivers to manage virtio
host rings without detailed knowledge of how the
vrings are created and deleted.

The function vringh_notify() is added so vringh clients
can notify the other side that buffers are added to the
used-ring.

Cc: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: NSjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (constified vringh_config)
      3beee86a
  17. 13 2月, 2013 1 次提交
  19. 11 2月, 2013 1 次提交
  21. 18 12月, 2012 3 次提交
  23. 28 9月, 2012 1 次提交
  25. 20 7月, 2012 1 次提交
  27. 31 3月, 2012 1 次提交
  29. 12 1月, 2012 4 次提交
  31. 02 11月, 2011 1 次提交
  33. 24 10月, 2011 1 次提交
  35. 30 5月, 2011 1 次提交
    • M
      virtio: add api for delayed callbacks · 7ab358c2
      由 Michael S. Tsirkin 提交于 
      Add an API that tells the other side that callbacks
should be delayed until a lot of work has been done.
Implement using the new event_idx feature.

Note: it might seem advantageous to let the drivers
ask for a callback after a specific capacity has
been reached. However, as a single head can
free many entries in the descriptor table,
we don't really have a clue about capacity
until get_buf is called. The API is the simplest
to implement at the moment, we'll see what kind of
hints drivers can pass when there's more than one
user of the feature.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
      7ab358c2
  37. 19 5月, 2010 3 次提交
  39. 13 3月, 2010 1 次提交
  41. 24 2月, 2010 1 次提交
  43. 03 2月, 2010 1 次提交
  45. 23 9月, 2009 1 次提交
  47. 12 6月, 2009 2 次提交
  49. 02 5月, 2008 1 次提交
    • R
      virtio: explicit advertisement of driver features · c45a6816
      由 Rusty Russell 提交于 
      A recent proposed feature addition to the virtio block driver revealed
some flaws in the API: in particular, we assume that feature
negotiation is complete once a driver's probe function returns.

There is nothing in the API to require this, however, and even I
didn't notice when it was violated.

So instead, we require the driver to specify what features it supports
in a table, we can then move the feature negotiation into the virtio
core.  The intersection of device and driver features are presented in
a new 'features' bitmap in the struct virtio_device.

Note that this highlights the difference between Linux unsigned-long
bitmaps where each unsigned long is in native endian, and a
straight-forward little-endian array of bytes.

Drivers can still remove feature bits in their probe routine if they
really have to.

API changes:
- dev->config->feature() no longer gets and acks a feature.
- drivers should advertise their features in the 'feature_table' field
- use virtio_has_feature() for extra sanity when checking feature bits
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
      c45a6816
  51. 08 4月, 2008 1 次提交
    • R
      virtio: remove overzealous BUG_ON. · 2557a933
      由 Rusty Russell 提交于 
      The 'disable_cb' callback is designed as an optimization to tell the host
we don't need callbacks now.  As it is not reliable, the debug check is
overzealous: it can happen on two CPUs at the same time.  Document this.

Even if it were reliable, the virtio_net driver doesn't disable
callbacks on transmit so the START_USE/END_USE debugging reentrance
protection can be easily tripped even on UP.

Thanks to Balaji Rao for the bug report and testing.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
CC: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      2557a933