kernel/linux.git/drivers/virtio/virtio_ring.c, branch linux-6.0.y

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_ring: packed: introduce virtqueue_resize_packed()

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

virtio ring packed supports resize. Only after the new vring is successfully allocated based on the new num, we will release the old vring. In any case, an error is returned, indicating that the vring still points to the old vring. In the case of an error, re-initialize(by virtqueue_reinit_packed()) the virtqueue to ensure that the vring can be used. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-24-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin

virtio_ring: packed: introduce virtqueue_reinit_packed()

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

Introduce a function to initialize vq without allocating new ring, desc_state, desc_extra. Subsequent patches will call this function after reset vq to reinitialize vq. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-23-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin

virtio_ring: packed: extract the logic of attach vring

2022-08-11T08:06:39+00:00

Separate the logic of attach vring, the subsequent patch will call it separately. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-22-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin

virtio_ring: packed: extract the logic of vring init

2022-08-11T08:06:39+00:00

Separate the logic of initializing vring, and subsequent patches will call it separately. This function completes the variable initialization of packed vring. It together with the logic of atatch constitutes the initialization of vring. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-21-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin

virtio_ring: packed: extract the logic of alloc state and extra

2022-08-11T08:06:39+00:00

Separate the logic for alloc desc_state and desc_extra, which will be called separately by subsequent patches. Use struct vring_packed to pass desc_state, desc_extra. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-20-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin

virtio_ring: packed: extract the logic of alloc queue

2022-08-11T08:06:39+00:00

Separate the logic of packed to create vring queue. This feature is required for subsequent virtuqueue reset vring. Signed-off-by: Xuan Zhuo Acked-by: Jason Wang Message-Id: <20220801063902.129329-19-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin