linux-toradex.git/include/linux/virtio.h, branch v6.4-rc1

virtio_ring: Use const to annotate read-only pointer params

2023-04-21T07:02:30+00:00

Add const to make the read-only pointer parameters clear, similar to
many existing functions.

To implement this change, the commit also introduces the use of
`container_of_const` to implement `to_vvq`, which ensures the const-ness
of read-only parameters and avoids accidental modification of their
members.

Signed-off-by: Feng Liu 
Reviewed-by: Jiri Pirko 
Reviewed-by: Parav Pandit 
Reviewed-by: Gavin Li 
Reviewed-by: Bodong Wang 

Message-Id: <20230310053428.3376-4-feliu@nvidia.com>
Signed-off-by: Michael S. Tsirkin

virtio: Reorder fields in 'struct virtqueue'

2023-04-21T07:02:29+00:00

Group some variables based on their sizes to reduce hole and avoid padding.
On x86_64, this shrinks the size of 'struct virtqueue'
from 72 to 68 bytes.

It saves a few bytes of memory.

Signed-off-by: Christophe JAILLET 
Message-Id: <8f3d2e49270a2158717e15008e7ed7228196ba02.1676707807.git.christophe.jaillet@wanadoo.fr>
Signed-off-by: Michael S. Tsirkin 
Acked-by: Peter Lafreniere 
Reviewed-by: Stefano Garzarella

virtio: move dev_to_virtio() to use container_of_const()

2023-01-27T12:45:46+00:00

The driver core is changing to pass some pointers as const, so move
dev_to_virtio() to use container_of_const() to handle this change.

dev_to_virtio() now properly keeps the const-ness of the pointer passed
into it, while as before it could be lost.

Cc: "Michael S. Tsirkin" 
Cc: Jason Wang 
Acked-by: Hans de Goede 
Link: https://lore.kernel.org/r/20230111113018.459199-12-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman

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