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Message-ID: <20250324060127.2358-1-jasowang@redhat.com>
Date: Mon, 24 Mar 2025 14:01:21 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com,
jasowang@...hat.com
Cc: xuanzhuo@...ux.alibaba.com,
eperezma@...hat.com,
virtualization@...ts.linux.dev,
linux-kernel@...r.kernel.org
Subject: [PATCH 13/19] virtio_ring: introduce virtqueue ops
This patch introduces virtqueue ops which is a set of the callbacks
that will be called for different queue layout or features. This would
help to avoid branches for split/packed and will ease the future
implementation like in order.
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
drivers/virtio/virtio_ring.c | 96 +++++++++++++++++++++++++-----------
1 file changed, 67 insertions(+), 29 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a2884eae14d9..ce1dc90ee89d 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -159,9 +159,30 @@ struct vring_virtqueue_packed {
size_t event_size_in_bytes;
};
+struct vring_virtqueue;
+
+struct virtqueue_ops {
+ int (*add)(struct vring_virtqueue *_vq, struct scatterlist *sgs[],
+ unsigned int total_sg, unsigned int out_sgs,
+ unsigned int in_sgs, void *data,
+ void *ctx, bool premapped, gfp_t gfp);
+ void *(*get)(struct vring_virtqueue *vq, unsigned int *len, void **ctx);
+ bool (*kick_prepare)(struct vring_virtqueue *vq);
+ void (*disable_cb)(struct vring_virtqueue *vq);
+ bool (*enable_cb_delayed)(struct vring_virtqueue *vq);
+ unsigned int (*enable_cb_prepare)(struct vring_virtqueue *vq);
+ bool (*poll)(const struct vring_virtqueue *vq, u16 last_used_idx);
+ void *(*detach_unused_buf)(struct vring_virtqueue *vq);
+ bool (*more_used)(const struct vring_virtqueue *vq);
+ int (*resize)(struct vring_virtqueue *vq, u32 num);
+ void (*reset)(struct vring_virtqueue *vq);
+};
+
struct vring_virtqueue {
struct virtqueue vq;
+ struct virtqueue_ops *ops;
+
/* Is this a packed ring? */
bool packed_ring;
@@ -1116,6 +1137,8 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
return 0;
}
+struct virtqueue_ops split_ops;
+
static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
struct vring_virtqueue_split *vring_split,
struct virtio_device *vdev,
@@ -1134,6 +1157,7 @@ static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
return NULL;
vq->packed_ring = false;
+ vq->ops = &split_ops;
vq->vq.callback = callback;
vq->vq.vdev = vdev;
vq->vq.name = name;
@@ -2076,6 +2100,8 @@ static void virtqueue_reset_packed(struct vring_virtqueue *vq)
virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
}
+struct virtqueue_ops packed_ops;
+
static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
struct vring_virtqueue_packed *vring_packed,
struct virtio_device *vdev,
@@ -2107,6 +2133,7 @@ static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
vq->broken = false;
#endif
vq->packed_ring = true;
+ vq->ops = &packed_ops;
vq->dma_dev = dma_dev;
vq->use_dma_api = vring_use_dma_api(vdev);
@@ -2194,6 +2221,34 @@ static int virtqueue_resize_packed(struct vring_virtqueue *vq, u32 num)
return -ENOMEM;
}
+struct virtqueue_ops split_ops = {
+ .add = virtqueue_add_split,
+ .get = virtqueue_get_buf_ctx_split,
+ .kick_prepare = virtqueue_kick_prepare_split,
+ .disable_cb = virtqueue_disable_cb_split,
+ .enable_cb_delayed = virtqueue_enable_cb_delayed_split,
+ .enable_cb_prepare = virtqueue_enable_cb_prepare_split,
+ .poll = virtqueue_poll_split,
+ .detach_unused_buf = virtqueue_detach_unused_buf_split,
+ .more_used = more_used_split,
+ .resize = virtqueue_resize_split,
+ .reset = virtqueue_reset_split,
+};
+
+struct virtqueue_ops packed_ops = {
+ .add = virtqueue_add_packed,
+ .get = virtqueue_get_buf_ctx_packed,
+ .kick_prepare = virtqueue_kick_prepare_packed,
+ .disable_cb = virtqueue_disable_cb_packed,
+ .enable_cb_delayed = virtqueue_enable_cb_delayed_packed,
+ .enable_cb_prepare = virtqueue_enable_cb_prepare_packed,
+ .poll = virtqueue_poll_packed,
+ .detach_unused_buf = virtqueue_detach_unused_buf_packed,
+ .more_used = more_used_packed,
+ .resize = virtqueue_resize_packed,
+ .reset = virtqueue_reset_packed,
+};
+
static int virtqueue_disable_and_recycle(struct virtqueue *_vq,
void (*recycle)(struct virtqueue *vq, void *buf))
{
@@ -2248,10 +2303,8 @@ static inline int virtqueue_add(struct virtqueue *_vq,
{
struct vring_virtqueue *vq = to_vvq(_vq);
- return vq->packed_ring ? virtqueue_add_packed(vq, sgs, total_sg,
- out_sgs, in_sgs, data, ctx, premapped, gfp) :
- virtqueue_add_split(vq, sgs, total_sg,
- out_sgs, in_sgs, data, ctx, premapped, gfp);
+ return vq->ops->add(vq, sgs, total_sg,
+ out_sgs, in_sgs, data, ctx, premapped, gfp);
}
/**
@@ -2437,8 +2490,7 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- return vq->packed_ring ? virtqueue_kick_prepare_packed(vq) :
- virtqueue_kick_prepare_split(vq);
+ return vq->ops->kick_prepare(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_kick_prepare);
@@ -2508,8 +2560,7 @@ void *virtqueue_get_buf_ctx(struct virtqueue *_vq, unsigned int *len,
{
struct vring_virtqueue *vq = to_vvq(_vq);
- return vq->packed_ring ? virtqueue_get_buf_ctx_packed(vq, len, ctx) :
- virtqueue_get_buf_ctx_split(vq, len, ctx);
+ return vq->ops->get(vq, len, ctx);
}
EXPORT_SYMBOL_GPL(virtqueue_get_buf_ctx);
@@ -2531,10 +2582,7 @@ void virtqueue_disable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- if (vq->packed_ring)
- virtqueue_disable_cb_packed(vq);
- else
- virtqueue_disable_cb_split(vq);
+ return vq->ops->disable_cb(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_disable_cb);
@@ -2557,8 +2605,7 @@ unsigned int virtqueue_enable_cb_prepare(struct virtqueue *_vq)
if (vq->event_triggered)
vq->event_triggered = false;
- return vq->packed_ring ? virtqueue_enable_cb_prepare_packed(vq) :
- virtqueue_enable_cb_prepare_split(vq);
+ return vq->ops->enable_cb_prepare(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_enable_cb_prepare);
@@ -2579,8 +2626,7 @@ bool virtqueue_poll(struct virtqueue *_vq, unsigned int last_used_idx)
return false;
virtio_mb(vq->weak_barriers);
- return vq->packed_ring ? virtqueue_poll_packed(vq, last_used_idx) :
- virtqueue_poll_split(vq, last_used_idx);
+ return vq->ops->poll(vq, last_used_idx);
}
EXPORT_SYMBOL_GPL(virtqueue_poll);
@@ -2623,8 +2669,7 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
if (vq->event_triggered)
vq->event_triggered = false;
- return vq->packed_ring ? virtqueue_enable_cb_delayed_packed(vq) :
- virtqueue_enable_cb_delayed_split(vq);
+ return vq->ops->enable_cb_delayed(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_enable_cb_delayed);
@@ -2640,14 +2685,13 @@ void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
- return vq->packed_ring ? virtqueue_detach_unused_buf_packed(vq) :
- virtqueue_detach_unused_buf_split(vq);
+ return vq->ops->detach_unused_buf(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_detach_unused_buf);
static inline bool more_used(const struct vring_virtqueue *vq)
{
- return vq->packed_ring ? more_used_packed(vq) : more_used_split(vq);
+ return vq->ops->more_used(vq);
}
/**
@@ -2785,10 +2829,7 @@ int virtqueue_resize(struct virtqueue *_vq, u32 num,
if (recycle_done)
recycle_done(_vq);
- if (vq->packed_ring)
- err = virtqueue_resize_packed(vq, num);
- else
- err = virtqueue_resize_split(vq, num);
+ err = vq->ops->resize(vq, num);
return virtqueue_enable_after_reset(_vq);
}
@@ -2822,10 +2863,7 @@ int virtqueue_reset(struct virtqueue *_vq,
if (recycle_done)
recycle_done(_vq);
- if (vq->packed_ring)
- virtqueue_reset_packed(vq);
- else
- virtqueue_reset_split(vq);
+ vq->ops->reset(vq);
return virtqueue_enable_after_reset(_vq);
}
--
2.42.0
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