diff mbox series

[v7,05/26] virtio_ring: split: extract the logic of init vq and attach vring

Message ID 20220308123518.33800-6-xuanzhuo@linux.alibaba.com (mailing list archive)
State Not Applicable
Delegated to: Netdev Maintainers
Headers show
Series virtio pci support VIRTIO_F_RING_RESET | expand

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Context Check Description
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers warning 5 maintainers not CCed: andrii@kernel.org kpsingh@kernel.org kafai@fb.com songliubraving@fb.com yhs@fb.com
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 7 this patch: 7
netdev/checkpatch warning WARNING: line length of 96 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Xuan Zhuo March 8, 2022, 12:34 p.m. UTC 
Split the logic of split assignment vq into three parts.

1. The assignment passed from the function parameter
2. The part that attaches vring to vq. -- __vring_virtqueue_attach_split()
3. The part that initializes vq to a fixed value --
   __vring_virtqueue_init_split()

This feature is required for subsequent virtuqueue reset vring

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 111 +++++++++++++++++++++--------------
 1 file changed, 67 insertions(+), 44 deletions(-)

Comments

Jason Wang March 9, 2022, 7:36 a.m. UTC | #1 
在 2022/3/8 下午8:34, Xuan Zhuo 写道:
> Split the logic of split assignment vq into three parts.
>
> 1. The assignment passed from the function parameter
> 2. The part that attaches vring to vq. -- __vring_virtqueue_attach_split()
> 3. The part that initializes vq to a fixed value --
>     __vring_virtqueue_init_split()
>
> This feature is required for subsequent virtuqueue reset vring
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>   drivers/virtio/virtio_ring.c | 111 +++++++++++++++++++++--------------
>   1 file changed, 67 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index d32793615451..dc6313b79305 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2196,34 +2196,40 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
>   }
>   EXPORT_SYMBOL_GPL(vring_interrupt);
>   
> -/* Only available for split ring */
> -struct virtqueue *__vring_new_virtqueue(unsigned int index,
> -					struct vring vring,
> -					struct virtio_device *vdev,
> -					bool weak_barriers,
> -					bool context,
> -					bool (*notify)(struct virtqueue *),
> -					void (*callback)(struct virtqueue *),
> -					const char *name)
> +static int __vring_virtqueue_attach_split(struct vring_virtqueue *vq,
> +					  struct virtio_device *vdev,
> +					  struct vring vring)
>   {
> -	struct vring_virtqueue *vq;
> +	vq->vq.num_free = vring.num;
>   
> -	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
> -		return NULL;
> +	vq->split.vring = vring;
> +	vq->split.queue_dma_addr = 0;
> +	vq->split.queue_size_in_bytes = 0;
>   
> -	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
> -	if (!vq)
> -		return NULL;
> +	vq->split.desc_state = kmalloc_array(vring.num,
> +					     sizeof(struct vring_desc_state_split), GFP_KERNEL);
> +	if (!vq->split.desc_state)
> +		goto err_state;
>   
> +	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
> +	if (!vq->split.desc_extra)
> +		goto err_extra;


So this contains stuffs more than just attach. I wonder if it's better 
to split the allocation out to an dedicated helper (we have dedicated 
helper to allocate vring).

Thanks


> +
> +	memset(vq->split.desc_state, 0, vring.num *
> +	       sizeof(struct vring_desc_state_split));
> +	return 0;
> +
> +err_extra:
> +	kfree(vq->split.desc_state);
> +err_state:
> +	return -ENOMEM;
> +}
> +
> +static void __vring_virtqueue_init_split(struct vring_virtqueue *vq,
> +					 struct virtio_device *vdev)
> +{
>   	vq->packed_ring = false;
> -	vq->vq.callback = callback;
> -	vq->vq.vdev = vdev;
> -	vq->vq.name = name;
> -	vq->vq.num_free = vring.num;
> -	vq->vq.index = index;
>   	vq->we_own_ring = false;
> -	vq->notify = notify;
> -	vq->weak_barriers = weak_barriers;
>   	vq->broken = false;
>   	vq->last_used_idx = 0;
>   	vq->event_triggered = false;
> @@ -2234,50 +2240,67 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   	vq->last_add_time_valid = false;
>   #endif
>   
> -	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;
>   
> -	vq->split.queue_dma_addr = 0;
> -	vq->split.queue_size_in_bytes = 0;
> -
> -	vq->split.vring = vring;
>   	vq->split.avail_flags_shadow = 0;
>   	vq->split.avail_idx_shadow = 0;
>   
>   	/* No callback?  Tell other side not to bother us. */
> -	if (!callback) {
> +	if (!vq->vq.callback) {
>   		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
>   		if (!vq->event)
>   			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
>   					vq->split.avail_flags_shadow);
>   	}
>   
> -	vq->split.desc_state = kmalloc_array(vring.num,
> -			sizeof(struct vring_desc_state_split), GFP_KERNEL);
> -	if (!vq->split.desc_state)
> -		goto err_state;
> -
> -	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
> -	if (!vq->split.desc_extra)
> -		goto err_extra;
> -
>   	/* Put everything in free lists. */
>   	vq->free_head = 0;
> -	memset(vq->split.desc_state, 0, vring.num *
> -			sizeof(struct vring_desc_state_split));
> +}
> +
> +/* Only available for split ring */
> +struct virtqueue *__vring_new_virtqueue(unsigned int index,
> +					struct vring vring,
> +					struct virtio_device *vdev,
> +					bool weak_barriers,
> +					bool context,
> +					bool (*notify)(struct virtqueue *),
> +					void (*callback)(struct virtqueue *),
> +					const char *name)
> +{
> +	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;
> +
> +	vq->vq.callback = callback;
> +	vq->vq.vdev = vdev;
> +	vq->vq.name = name;
> +	vq->vq.index = index;
> +	vq->notify = notify;
> +	vq->weak_barriers = weak_barriers;
> +	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
> +		!context;
> +
> +	err = __vring_virtqueue_attach_split(vq, vdev, vring);
> +	if (err)
> +		goto err;
> +
> +	__vring_virtqueue_init_split(vq, vdev);
>   
>   	spin_lock(&vdev->vqs_list_lock);
>   	list_add_tail(&vq->vq.list, &vdev->vqs);
>   	spin_unlock(&vdev->vqs_list_lock);
> -	return &vq->vq;
>   
> -err_extra:
> -	kfree(vq->split.desc_state);
> -err_state:
> +	return &vq->vq;
> +err:
>   	kfree(vq);
>   	return NULL;
>   }
Xuan Zhuo March 9, 2022, 9:21 a.m. UTC | #2 
On Wed, 9 Mar 2022 15:36:59 +0800, Jason Wang <jasowang@redhat.com> wrote:
>
> 在 2022/3/8 下午8:34, Xuan Zhuo 写道:
> > Split the logic of split assignment vq into three parts.
> >
> > 1. The assignment passed from the function parameter
> > 2. The part that attaches vring to vq. -- __vring_virtqueue_attach_split()
> > 3. The part that initializes vq to a fixed value --
> >     __vring_virtqueue_init_split()
> >
> > This feature is required for subsequent virtuqueue reset vring
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > ---
> >   drivers/virtio/virtio_ring.c | 111 +++++++++++++++++++++--------------
> >   1 file changed, 67 insertions(+), 44 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index d32793615451..dc6313b79305 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -2196,34 +2196,40 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
> >   }
> >   EXPORT_SYMBOL_GPL(vring_interrupt);
> >
> > -/* Only available for split ring */
> > -struct virtqueue *__vring_new_virtqueue(unsigned int index,
> > -					struct vring vring,
> > -					struct virtio_device *vdev,
> > -					bool weak_barriers,
> > -					bool context,
> > -					bool (*notify)(struct virtqueue *),
> > -					void (*callback)(struct virtqueue *),
> > -					const char *name)
> > +static int __vring_virtqueue_attach_split(struct vring_virtqueue *vq,
> > +					  struct virtio_device *vdev,
> > +					  struct vring vring)
> >   {
> > -	struct vring_virtqueue *vq;
> > +	vq->vq.num_free = vring.num;
> >
> > -	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
> > -		return NULL;
> > +	vq->split.vring = vring;
> > +	vq->split.queue_dma_addr = 0;
> > +	vq->split.queue_size_in_bytes = 0;
> >
> > -	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
> > -	if (!vq)
> > -		return NULL;
> > +	vq->split.desc_state = kmalloc_array(vring.num,
> > +					     sizeof(struct vring_desc_state_split), GFP_KERNEL);
> > +	if (!vq->split.desc_state)
> > +		goto err_state;
> >
> > +	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
> > +	if (!vq->split.desc_extra)
> > +		goto err_extra;
>
>
> So this contains stuffs more than just attach. I wonder if it's better
> to split the allocation out to an dedicated helper (we have dedicated
> helper to allocate vring).

I will try in next version.

Thanks.

>
> Thanks
>
>
> > +
> > +	memset(vq->split.desc_state, 0, vring.num *
> > +	       sizeof(struct vring_desc_state_split));
> > +	return 0;
> > +
> > +err_extra:
> > +	kfree(vq->split.desc_state);
> > +err_state:
> > +	return -ENOMEM;
> > +}
> > +
> > +static void __vring_virtqueue_init_split(struct vring_virtqueue *vq,
> > +					 struct virtio_device *vdev)
> > +{
> >   	vq->packed_ring = false;
> > -	vq->vq.callback = callback;
> > -	vq->vq.vdev = vdev;
> > -	vq->vq.name = name;
> > -	vq->vq.num_free = vring.num;
> > -	vq->vq.index = index;
> >   	vq->we_own_ring = false;
> > -	vq->notify = notify;
> > -	vq->weak_barriers = weak_barriers;
> >   	vq->broken = false;
> >   	vq->last_used_idx = 0;
> >   	vq->event_triggered = false;
> > @@ -2234,50 +2240,67 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
> >   	vq->last_add_time_valid = false;
> >   #endif
> >
> > -	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;
> >
> > -	vq->split.queue_dma_addr = 0;
> > -	vq->split.queue_size_in_bytes = 0;
> > -
> > -	vq->split.vring = vring;
> >   	vq->split.avail_flags_shadow = 0;
> >   	vq->split.avail_idx_shadow = 0;
> >
> >   	/* No callback?  Tell other side not to bother us. */
> > -	if (!callback) {
> > +	if (!vq->vq.callback) {
> >   		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
> >   		if (!vq->event)
> >   			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
> >   					vq->split.avail_flags_shadow);
> >   	}
> >
> > -	vq->split.desc_state = kmalloc_array(vring.num,
> > -			sizeof(struct vring_desc_state_split), GFP_KERNEL);
> > -	if (!vq->split.desc_state)
> > -		goto err_state;
> > -
> > -	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
> > -	if (!vq->split.desc_extra)
> > -		goto err_extra;
> > -
> >   	/* Put everything in free lists. */
> >   	vq->free_head = 0;
> > -	memset(vq->split.desc_state, 0, vring.num *
> > -			sizeof(struct vring_desc_state_split));
> > +}
> > +
> > +/* Only available for split ring */
> > +struct virtqueue *__vring_new_virtqueue(unsigned int index,
> > +					struct vring vring,
> > +					struct virtio_device *vdev,
> > +					bool weak_barriers,
> > +					bool context,
> > +					bool (*notify)(struct virtqueue *),
> > +					void (*callback)(struct virtqueue *),
> > +					const char *name)
> > +{
> > +	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;
> > +
> > +	vq->vq.callback = callback;
> > +	vq->vq.vdev = vdev;
> > +	vq->vq.name = name;
> > +	vq->vq.index = index;
> > +	vq->notify = notify;
> > +	vq->weak_barriers = weak_barriers;
> > +	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
> > +		!context;
> > +
> > +	err = __vring_virtqueue_attach_split(vq, vdev, vring);
> > +	if (err)
> > +		goto err;
> > +
> > +	__vring_virtqueue_init_split(vq, vdev);
> >
> >   	spin_lock(&vdev->vqs_list_lock);
> >   	list_add_tail(&vq->vq.list, &vdev->vqs);
> >   	spin_unlock(&vdev->vqs_list_lock);
> > -	return &vq->vq;
> >
> > -err_extra:
> > -	kfree(vq->split.desc_state);
> > -err_state:
> > +	return &vq->vq;
> > +err:
> >   	kfree(vq);
> >   	return NULL;
> >   }
>
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index d32793615451..dc6313b79305 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2196,34 +2196,40 @@  irqreturn_t vring_interrupt(int irq, void *_vq)
 }
 EXPORT_SYMBOL_GPL(vring_interrupt);
 
-/* Only available for split ring */
-struct virtqueue *__vring_new_virtqueue(unsigned int index,
-					struct vring vring,
-					struct virtio_device *vdev,
-					bool weak_barriers,
-					bool context,
-					bool (*notify)(struct virtqueue *),
-					void (*callback)(struct virtqueue *),
-					const char *name)
+static int __vring_virtqueue_attach_split(struct vring_virtqueue *vq,
+					  struct virtio_device *vdev,
+					  struct vring vring)
 {
-	struct vring_virtqueue *vq;
+	vq->vq.num_free = vring.num;
 
-	if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED))
-		return NULL;
+	vq->split.vring = vring;
+	vq->split.queue_dma_addr = 0;
+	vq->split.queue_size_in_bytes = 0;
 
-	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
-	if (!vq)
-		return NULL;
+	vq->split.desc_state = kmalloc_array(vring.num,
+					     sizeof(struct vring_desc_state_split), GFP_KERNEL);
+	if (!vq->split.desc_state)
+		goto err_state;
 
+	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
+	if (!vq->split.desc_extra)
+		goto err_extra;
+
+	memset(vq->split.desc_state, 0, vring.num *
+	       sizeof(struct vring_desc_state_split));
+	return 0;
+
+err_extra:
+	kfree(vq->split.desc_state);
+err_state:
+	return -ENOMEM;
+}
+
+static void __vring_virtqueue_init_split(struct vring_virtqueue *vq,
+					 struct virtio_device *vdev)
+{
 	vq->packed_ring = false;
-	vq->vq.callback = callback;
-	vq->vq.vdev = vdev;
-	vq->vq.name = name;
-	vq->vq.num_free = vring.num;
-	vq->vq.index = index;
 	vq->we_own_ring = false;
-	vq->notify = notify;
-	vq->weak_barriers = weak_barriers;
 	vq->broken = false;
 	vq->last_used_idx = 0;
 	vq->event_triggered = false;
@@ -2234,50 +2240,67 @@  struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	vq->last_add_time_valid = false;
 #endif
 
-	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;
 
-	vq->split.queue_dma_addr = 0;
-	vq->split.queue_size_in_bytes = 0;
-
-	vq->split.vring = vring;
 	vq->split.avail_flags_shadow = 0;
 	vq->split.avail_idx_shadow = 0;
 
 	/* No callback?  Tell other side not to bother us. */
-	if (!callback) {
+	if (!vq->vq.callback) {
 		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
 		if (!vq->event)
 			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
 					vq->split.avail_flags_shadow);
 	}
 
-	vq->split.desc_state = kmalloc_array(vring.num,
-			sizeof(struct vring_desc_state_split), GFP_KERNEL);
-	if (!vq->split.desc_state)
-		goto err_state;
-
-	vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num);
-	if (!vq->split.desc_extra)
-		goto err_extra;
-
 	/* Put everything in free lists. */
 	vq->free_head = 0;
-	memset(vq->split.desc_state, 0, vring.num *
-			sizeof(struct vring_desc_state_split));
+}
+
+/* Only available for split ring */
+struct virtqueue *__vring_new_virtqueue(unsigned int index,
+					struct vring vring,
+					struct virtio_device *vdev,
+					bool weak_barriers,
+					bool context,
+					bool (*notify)(struct virtqueue *),
+					void (*callback)(struct virtqueue *),
+					const char *name)
+{
+	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;
+
+	vq->vq.callback = callback;
+	vq->vq.vdev = vdev;
+	vq->vq.name = name;
+	vq->vq.index = index;
+	vq->notify = notify;
+	vq->weak_barriers = weak_barriers;
+	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
+		!context;
+
+	err = __vring_virtqueue_attach_split(vq, vdev, vring);
+	if (err)
+		goto err;
+
+	__vring_virtqueue_init_split(vq, vdev);
 
 	spin_lock(&vdev->vqs_list_lock);
 	list_add_tail(&vq->vq.list, &vdev->vqs);
 	spin_unlock(&vdev->vqs_list_lock);
-	return &vq->vq;
 
-err_extra:
-	kfree(vq->split.desc_state);
-err_state:
+	return &vq->vq;
+err:
 	kfree(vq);
 	return NULL;
 }