Re: [PATCH v2] virtio: Make vring_new_virtqueue support for packed vring

From: Stefano Garzarella
Date: Mon Oct 07 2024 - 08:47:32 EST

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In reply to: huangwenyu1998: "[PATCH v2] virtio: Make vring_new_virtqueue support for packed vring"
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On Sat, Oct 05, 2024 at 03:42:01PM GMT, huangwenyu1998@xxxxxxxxx wrote:

From: Wenyu Huang <huangwenyu1998@xxxxxxxxx>

It used for testing in tools/virtio/vringh_test.c.
If vring_new_virtqueue supports packed vring, we can add support for
packed vring to vringh and test it.

Signed-off-by: Wenyu Huang <huangwenyu1998@xxxxxxxxx>
---
Changes in v2: Make the commit title and description more clearer.
drivers/virtio/virtio_ring.c | 153 +++++++++++++++++++++--------------
1 file changed, 92 insertions(+), 61 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index be7309b1e860..664a0c40ee05 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -223,7 +223,7 @@ struct vring_virtqueue {
#endif
};

-static struct virtqueue *__vring_new_virtqueue(unsigned int index,
+static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
struct vring_virtqueue_split *vring_split,
struct virtio_device *vdev,
bool weak_barriers,
@@ -232,6 +232,15 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index,
void (*callback)(struct virtqueue *),
const char *name,
struct device *dma_dev);
+static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
+ struct vring_virtqueue_packed *vring_packed,
+ struct virtio_device *vdev,
+ bool weak_barriers,
+ bool context,
+ bool (*notify)(struct virtqueue *),
+ void (*callback)(struct virtqueue *),
+ const char *name,
+ struct device *dma_dev);
static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num);
static void vring_free(struct virtqueue *_vq);

@@ -1160,7 +1169,7 @@ static struct virtqueue *vring_create_virtqueue_split(
if (err)
return NULL;

- vq = __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
+ vq = __vring_new_virtqueue_split(index, &vring_split, vdev, weak_barriers,
context, notify, callback, name, dma_dev);
if (!vq) {
vring_free_split(&vring_split, vdev, dma_dev);
@@ -2064,62 +2073,21 @@ static struct virtqueue *vring_create_virtqueue_packed(
struct device *dma_dev)
{
struct vring_virtqueue_packed vring_packed = {};
- struct vring_virtqueue *vq;
- int err;
+ struct virtqueue *vq;

if (vring_alloc_queue_packed(&vring_packed, vdev, num, dma_dev))
- goto err_ring;
-
- vq = kmalloc(sizeof(*vq), GFP_KERNEL);
- if (!vq)
- goto err_vq;
-
- vq->vq.callback = callback;
- vq->vq.vdev = vdev;
- vq->vq.name = name;
- vq->vq.index = index;
- vq->vq.reset = false;
- vq->we_own_ring = true;
- vq->notify = notify;
- vq->weak_barriers = weak_barriers;
-#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
- vq->broken = true;
-#else
- vq->broken = false;
-#endif
- vq->packed_ring = true;
- vq->dma_dev = dma_dev;
- vq->use_dma_api = vring_use_dma_api(vdev);
- vq->premapped = false;
- vq->do_unmap = vq->use_dma_api;
-
- vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
- !context;
- vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
-
- if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
- vq->weak_barriers = false;
-
- err = vring_alloc_state_extra_packed(&vring_packed);
- if (err)
- goto err_state_extra;
-
- virtqueue_vring_init_packed(&vring_packed, !!callback);
+ return NULL;

- virtqueue_init(vq, num);
- virtqueue_vring_attach_packed(vq, &vring_packed);
+ vq = __vring_new_virtqueue_packed(index, &vring_packed, vdev, weak_barriers,
+ context, notify, callback, name, dma_dev);
+ if (!vq) {
+ vring_free_packed(&vring_packed, vdev, dma_dev);
+ return NULL;
+ }

- spin_lock(&vdev->vqs_list_lock);
- list_add_tail(&vq->vq.list, &vdev->vqs);
- spin_unlock(&vdev->vqs_list_lock);
- return &vq->vq;
+ to_vvq(vq)->we_own_ring = true;

-err_state_extra:
- kfree(vq);
-err_vq:
- vring_free_packed(&vring_packed, vdev, dma_dev);
-err_ring:
- return NULL;
+ return vq;
}

static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
@@ -2599,7 +2567,7 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
EXPORT_SYMBOL_GPL(vring_interrupt);

/* Only available for split ring */

^
This comment is not needed anymore.

-static struct virtqueue *__vring_new_virtqueue(unsigned int index,
+static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
struct vring_virtqueue_split *vring_split,
struct virtio_device *vdev,
bool weak_barriers,
@@ -2612,9 +2580,6 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index,
struct vring_virtqueue *vq;
int err;

- if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
- return NULL;
-
vq = kmalloc(sizeof(*vq), GFP_KERNEL);
if (!vq)
return NULL;
@@ -2662,6 +2627,66 @@ static struct virtqueue *__vring_new_virtqueue(unsigned int index,
return &vq->vq;
}

+static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
+ struct vring_virtqueue_packed *vring_packed,
+ struct virtio_device *vdev,
+ bool weak_barriers,
+ bool context,
+ bool (*notify)(struct virtqueue *),
+ void (*callback)(struct virtqueue *),
+ const char *name,
+ struct device *dma_dev)
+{
+ struct vring_virtqueue *vq;
+ int err;
+
+ vq = kmalloc(sizeof(*vq), GFP_KERNEL);
+ if (!vq)
+ return NULL;
+
+ vq->vq.callback = callback;
+ vq->vq.vdev = vdev;
+ vq->vq.name = name;
+ vq->vq.index = index;
+ vq->vq.reset = false;
+ vq->we_own_ring = false;
+ vq->notify = notify;
+ vq->weak_barriers = weak_barriers;
+#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
+ vq->broken = true;
+#else
+ vq->broken = false;
+#endif
+ vq->packed_ring = true;
+ vq->dma_dev = dma_dev;
+ vq->use_dma_api = vring_use_dma_api(vdev);
+ vq->premapped = false;
+ vq->do_unmap = vq->use_dma_api;
+
+ vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
+ !context;
+ vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
+
+ if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
+ vq->weak_barriers = false;
+
+ err = vring_alloc_state_extra_packed(vring_packed);
+ if (err) {
+ kfree(vq);
+ return NULL;
+ }
+
+ virtqueue_vring_init_packed(vring_packed, !!callback);
+
+ virtqueue_init(vq, vring_packed->vring.num);
+ virtqueue_vring_attach_packed(vq, vring_packed);
+
+ spin_lock(&vdev->vqs_list_lock);
+ list_add_tail(&vq->vq.list, &vdev->vqs);
+ spin_unlock(&vdev->vqs_list_lock);
+ return &vq->vq;
+}
+
struct virtqueue *vring_create_virtqueue(
unsigned int index,
unsigned int num,
@@ -2840,7 +2865,6 @@ int virtqueue_reset(struct virtqueue *_vq,
}
EXPORT_SYMBOL_GPL(virtqueue_reset);

-/* Only available for split ring */
struct virtqueue *vring_new_virtqueue(unsigned int index,
unsigned int num,
unsigned int vring_align,
@@ -2853,12 +2877,19 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
const char *name)
{
struct vring_virtqueue_split vring_split = {};
+ struct vring_virtqueue_packed vring_packed = {};

nit: we can move this declaration ...

- if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
- return NULL;
+ if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {

... here, since we use it only in this branch.

+ vring_packed.vring.num = num;
+ vring_packed.vring.desc = pages;
+ return __vring_new_virtqueue_packed(index, &vring_packed,
+ vdev, weak_barriers,
+ context, notify, callback,
+ name, vdev->dev.parent);
+ }

vring_init(&vring_split.vring, num, pages, vring_align);
- return __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
+ return __vring_new_virtqueue_split(index, &vring_split, vdev, weak_barriers,
context, notify, callback, name,
vdev->dev.parent);
}

Since it looks like we have 2 sections in virtio_ring.c for split and
packed API, what about moving the 2 new functions?

In this way we can also remove the definition on top of the file, I mean
to apply the following changes to your patch:

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 664a0c40ee05..9f67a98b0914 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -223,24 +223,6 @@ struct vring_virtqueue {
#endif
};

-static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
- struct vring_virtqueue_split *vring_split,
- struct virtio_device *vdev,
- bool weak_barriers,
- bool context,
- bool (*notify)(struct virtqueue *),
- void (*callback)(struct virtqueue *),
- const char *name,
- struct device *dma_dev);
-static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
- struct vring_virtqueue_packed *vring_packed,
- struct virtio_device *vdev,
- bool weak_barriers,
- bool context,
- bool (*notify)(struct virtqueue *),
- void (*callback)(struct virtqueue *),
- const char *name,
- struct device *dma_dev);
static struct vring_desc_extra *vring_alloc_desc_extra(unsigned int num);
static void vring_free(struct virtqueue *_vq);

@@ -1147,6 +1129,66 @@ static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
return 0;
}

+static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
+ struct vring_virtqueue_split *vring_split,
+ struct virtio_device *vdev,
+ bool weak_barriers,
+ bool context,
+ bool (*notify)(struct virtqueue *),
+ void (*callback)(struct virtqueue *),
+ const char *name,
+ struct device *dma_dev)
+{
+ struct vring_virtqueue *vq;
+ int err;
+
+ vq = kmalloc(sizeof(*vq), GFP_KERNEL);
+ if (!vq)
+ return NULL;
+
+ vq->packed_ring = false;
+ vq->vq.callback = callback;
+ vq->vq.vdev = vdev;
+ vq->vq.name = name;
+ vq->vq.index = index;
+ vq->vq.reset = false;
+ vq->we_own_ring = false;
+ vq->notify = notify;
+ vq->weak_barriers = weak_barriers;
+#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
+ vq->broken = true;
+#else
+ vq->broken = false;
+#endif
+ vq->dma_dev = dma_dev;
+ vq->use_dma_api = vring_use_dma_api(vdev);
+ vq->premapped = false;
+ vq->do_unmap = vq->use_dma_api;
+
+ vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
+ !context;
+ vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
+
+ if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
+ vq->weak_barriers = false;
+
+ err = vring_alloc_state_extra_split(vring_split);
+ if (err) {
+ kfree(vq);
+ return NULL;
+ }
+
+ virtqueue_vring_init_split(vring_split, vq);
+
+ virtqueue_init(vq, vring_split->vring.num);
+ virtqueue_vring_attach_split(vq, vring_split);
+
+ spin_lock(&vdev->vqs_list_lock);
+ list_add_tail(&vq->vq.list, &vdev->vqs);
+ spin_unlock(&vdev->vqs_list_lock);
+ return &vq->vq;
+}
+
static struct virtqueue *vring_create_virtqueue_split(
unsigned int index,
unsigned int num,
@@ -2059,6 +2101,66 @@ static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
}

+static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
+ struct vring_virtqueue_packed *vring_packed,
+ struct virtio_device *vdev,
+ bool weak_barriers,
+ bool context,
+ bool (*notify)(struct virtqueue *),
+ void (*callback)(struct virtqueue *),
+ const char *name,
+ struct device *dma_dev)
+{
+ struct vring_virtqueue *vq;
+ int err;
+
+ vq = kmalloc(sizeof(*vq), GFP_KERNEL);
+ if (!vq)
+ return NULL;
+
+ vq->vq.callback = callback;
+ vq->vq.vdev = vdev;
+ vq->vq.name = name;
+ vq->vq.index = index;
+ vq->vq.reset = false;
+ vq->we_own_ring = false;
+ vq->notify = notify;
+ vq->weak_barriers = weak_barriers;
+#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
+ vq->broken = true;
+#else
+ vq->broken = false;
+#endif
+ vq->packed_ring = true;
+ vq->dma_dev = dma_dev;
+ vq->use_dma_api = vring_use_dma_api(vdev);
+ vq->premapped = false;
+ vq->do_unmap = vq->use_dma_api;
+
+ vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
+ !context;
+ vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
+
+ if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
+ vq->weak_barriers = false;
+
+ err = vring_alloc_state_extra_packed(vring_packed);
+ if (err) {
+ kfree(vq);
+ return NULL;
+ }
+
+ virtqueue_vring_init_packed(vring_packed, !!callback);
+
+ virtqueue_init(vq, vring_packed->vring.num);
+ virtqueue_vring_attach_packed(vq, vring_packed);
+
+ spin_lock(&vdev->vqs_list_lock);
+ list_add_tail(&vq->vq.list, &vdev->vqs);
+ spin_unlock(&vdev->vqs_list_lock);
+ return &vq->vq;
+}
+
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,
@@ -2566,127 +2668,6 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
}
EXPORT_SYMBOL_GPL(vring_interrupt);

-/* Only available for split ring */
-static struct virtqueue *__vring_new_virtqueue_split(unsigned int index,
- struct vring_virtqueue_split *vring_split,
- struct virtio_device *vdev,
- bool weak_barriers,
- bool context,
- bool (*notify)(struct virtqueue *),
- void (*callback)(struct virtqueue *),
- const char *name,
- struct device *dma_dev)
-{
- struct vring_virtqueue *vq;
- int err;
-
- vq = kmalloc(sizeof(*vq), GFP_KERNEL);
- if (!vq)
- return NULL;
-
- vq->packed_ring = false;
- vq->vq.callback = callback;
- vq->vq.vdev = vdev;
- vq->vq.name = name;
- vq->vq.index = index;
- vq->vq.reset = false;
- vq->we_own_ring = false;
- vq->notify = notify;
- vq->weak_barriers = weak_barriers;
-#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
- vq->broken = true;
-#else
- vq->broken = false;
-#endif
- vq->dma_dev = dma_dev;
- vq->use_dma_api = vring_use_dma_api(vdev);
- vq->premapped = false;
- vq->do_unmap = vq->use_dma_api;
-
- vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
- !context;
- vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
-
- if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
- vq->weak_barriers = false;
-
- err = vring_alloc_state_extra_split(vring_split);
- if (err) {
- kfree(vq);
- return NULL;
- }
-
- virtqueue_vring_init_split(vring_split, vq);
-
- virtqueue_init(vq, vring_split->vring.num);
- virtqueue_vring_attach_split(vq, vring_split);
-
- spin_lock(&vdev->vqs_list_lock);
- list_add_tail(&vq->vq.list, &vdev->vqs);
- spin_unlock(&vdev->vqs_list_lock);
- return &vq->vq;
-}
-
-static struct virtqueue *__vring_new_virtqueue_packed(unsigned int index,
- struct vring_virtqueue_packed *vring_packed,
- struct virtio_device *vdev,
- bool weak_barriers,
- bool context,
- bool (*notify)(struct virtqueue *),
- void (*callback)(struct virtqueue *),
- const char *name,
- struct device *dma_dev)
-{
- struct vring_virtqueue *vq;
- int err;
-
- vq = kmalloc(sizeof(*vq), GFP_KERNEL);
- if (!vq)
- return NULL;
-
- vq->vq.callback = callback;
- vq->vq.vdev = vdev;
- vq->vq.name = name;
- vq->vq.index = index;
- vq->vq.reset = false;
- vq->we_own_ring = false;
- vq->notify = notify;
- vq->weak_barriers = weak_barriers;
-#ifdef CONFIG_VIRTIO_HARDEN_NOTIFICATION
- vq->broken = true;
-#else
- vq->broken = false;
-#endif
- vq->packed_ring = true;
- vq->dma_dev = dma_dev;
- vq->use_dma_api = vring_use_dma_api(vdev);
- vq->premapped = false;
- vq->do_unmap = vq->use_dma_api;
-
- vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
- !context;
- vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
-
- if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
- vq->weak_barriers = false;
-
- err = vring_alloc_state_extra_packed(vring_packed);
- if (err) {
- kfree(vq);
- return NULL;
- }
-
- virtqueue_vring_init_packed(vring_packed, !!callback);
-
- virtqueue_init(vq, vring_packed->vring.num);
- virtqueue_vring_attach_packed(vq, vring_packed);
-
- spin_lock(&vdev->vqs_list_lock);
- list_add_tail(&vq->vq.list, &vdev->vqs);
- spin_unlock(&vdev->vqs_list_lock);
- return &vq->vq;
-}
-
struct virtqueue *vring_create_virtqueue(
unsigned int index,
unsigned int num,

Thanks,
Stefano

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In reply to: huangwenyu1998: "[PATCH v2] virtio: Make vring_new_virtqueue support for packed vring"
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