linux-toradex.git/include/linux/virtio.h, branch v6.0-rc7

virtio: kerneldocs fixes and enhancements

2022-08-16T05:40:24+00:00

Fix variable names in some kerneldocs, naming in others.
Add kerneldocs for struct vring_desc and vring_interrupt.

Signed-off-by: Ricardo Cañuelo 
Message-Id: <20220810094004.1250-2-ricardo.canuelo@collabora.com>
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck

virtio_ring: struct virtqueue introduce reset

2022-08-11T08:06:40+00:00

Introduce a new member reset to the structure virtqueue to determine
whether the current vq is in the reset state. Subsequent patches will
use it.

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Message-Id: <20220801063902.129329-29-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin

virtio: allow to unbreak/break virtqueue individually

2022-08-11T08:06:40+00:00

This patch allows the new introduced
__virtqueue_break()/__virtqueue_unbreak() to break/unbreak the
virtqueue.

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Message-Id: <20220801063902.129329-27-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin

virtio_ring: introduce virtqueue_resize()

2022-08-11T08:06:40+00:00

Introduce virtqueue_resize() to implement the resize of vring.
Based on these, the driver can dynamically adjust the size of the vring.
For example: ethtool -G.

virtqueue_resize() implements resize based on the vq reset function. In
case of failure to allocate a new vring, it will give up resize and use
the original vring.

During this process, if the re-enable reset vq fails, the vq can no
longer be used. Although the probability of this situation is not high.

The parameter recycle is used to recycle the buffer that is no longer
used.

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Message-Id: <20220801063902.129329-25-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin

virtio: record the maximum queue num supported by the device.

2022-08-11T08:06:38+00:00

virtio-net can display the maximum (supported by hardware) ring size in
ethtool -g eth0.

When the subsequent patch implements vring reset, it can judge whether
the ring size passed by the driver is legal based on this.

Signed-off-by: Xuan Zhuo 
Acked-by: Jason Wang 
Message-Id: <20220801063902.129329-2-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin

virtio: allow to unbreak virtqueue

2022-05-31T16:45:10+00:00

This patch allows the new introduced __virtio_break_device() to
unbreak the virtqueue.

Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: "Paul E. McKenney" 
Cc: Marc Zyngier 
Cc: Halil Pasic 
Cc: Cornelia Huck 
Cc: Vineeth Vijayan 
Cc: Peter Oberparleiter 
Cc: linux-s390@vger.kernel.org
Signed-off-by: Jason Wang 
Message-Id: <20220527060120.20964-8-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Xuan Zhuo

virtio: unexport virtio_finalize_features

2022-03-04T13:33:21+00:00

virtio_finalize_features is only used internally within virtio.
No reason to export it.

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck 
Acked-by: Jason Wang

virtio: wrap config->reset calls

2022-01-14T23:50:52+00:00

This will enable cleanups down the road.
The idea is to disable cbs, then add "flush_queued_cbs" callback
as a parameter, this way drivers can flush any work
queued after callbacks have been disabled.

Signed-off-by: Michael S. Tsirkin 
Link: https://lore.kernel.org/r/20211013105226.20225-1-mst@redhat.com
Signed-off-by: Michael S. Tsirkin

Revert "virtio_ring: validate used buffer length"

2021-11-24T23:47:27+00:00

This reverts commit 939779f5152d161b34f612af29e7dc1ac4472fcf.

Attempts to validate length in the core did not work out: there turn out
to exist multiple broken devices, and in particular legacy devices are
known to be broken in this respect.

We have ideas for handling this better in the next version but for now
let's revert to a known good state to make sure drivers work for people.

Signed-off-by: Michael S. Tsirkin

virtio_ring: validate used buffer length

2021-11-01T09:26:48+00:00

This patch validate the used buffer length provided by the device
before trying to use it. This is done by record the in buffer length
in a new field in desc_state structure during virtqueue_add(), then we
can fail the virtqueue_get_buf() when we find the device is trying to
give us a used buffer length which is greater than the in buffer
length.

Since some drivers have already done the validation by themselves,
this patch tries to makes the core validation optional. For the driver
that doesn't want the validation, it can set the
suppress_used_validation to be true (which could be overridden by
force_used_validation module parameter). To be more efficient, a
dedicate array is used for storing the validate used length, this
helps to eliminate the cache stress if validation is done by the
driver.

Signed-off-by: Jason Wang 
Link: https://lore.kernel.org/r/20211027022107.14357-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin