From: Feng Liu via Virtualization <virtualization@lists.linux-foundation.org>
To: <virtualization@lists.linux-foundation.org>
Cc: "Michael S . Tsirkin" <mst@redhat.com>,
Jiri Pirko <jiri@nvidia.com>, Bodong Wang <bodong@nvidia.com>,
Gavin Li <gavinl@nvidia.com>
Subject: [PATCH v2 3/3] virtio_ring: Use const to annotate read-only pointer params
Date: Wed, 15 Mar 2023 20:54:58 +0200 [thread overview]
Message-ID: <20230315185458.11638-4-feliu@nvidia.com> (raw)
In-Reply-To: <20230315185458.11638-1-feliu@nvidia.com>
Add const to make the read-only pointer parameters clear, similar to
many existing functions.
Use `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 <feliu@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
---
v0 -> v1
feedbacks from Michael S. Tsirkin
- use `container_of_const` to implement `to_vvq`
---
drivers/virtio/virtio_ring.c | 36 ++++++++++++++++++------------------
include/linux/virtio.h | 14 +++++++-------
2 files changed, 25 insertions(+), 25 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a26fab91c59f..4c3bb0ddeb9b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -231,9 +231,9 @@ static void vring_free(struct virtqueue *_vq);
* Helpers.
*/
-#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq)
+#define to_vvq(_vq) container_of_const(_vq, struct vring_virtqueue, vq)
-static bool virtqueue_use_indirect(struct vring_virtqueue *vq,
+static bool virtqueue_use_indirect(const struct vring_virtqueue *vq,
unsigned int total_sg)
{
/*
@@ -269,7 +269,7 @@ static bool virtqueue_use_indirect(struct vring_virtqueue *vq,
* unconditionally on data path.
*/
-static bool vring_use_dma_api(struct virtio_device *vdev)
+static bool vring_use_dma_api(const struct virtio_device *vdev)
{
if (!virtio_has_dma_quirk(vdev))
return true;
@@ -289,7 +289,7 @@ static bool vring_use_dma_api(struct virtio_device *vdev)
return false;
}
-size_t virtio_max_dma_size(struct virtio_device *vdev)
+size_t virtio_max_dma_size(const struct virtio_device *vdev)
{
size_t max_segment_size = SIZE_MAX;
@@ -423,7 +423,7 @@ static void virtqueue_init(struct vring_virtqueue *vq, u32 num)
*/
static void vring_unmap_one_split_indirect(const struct vring_virtqueue *vq,
- struct vring_desc *desc)
+ const struct vring_desc *desc)
{
u16 flags;
@@ -1183,7 +1183,7 @@ static u16 packed_last_used(u16 last_used_idx)
}
static void vring_unmap_extra_packed(const struct vring_virtqueue *vq,
- struct vring_desc_extra *extra)
+ const struct vring_desc_extra *extra)
{
u16 flags;
@@ -1206,7 +1206,7 @@ static void vring_unmap_extra_packed(const struct vring_virtqueue *vq,
}
static void vring_unmap_desc_packed(const struct vring_virtqueue *vq,
- struct vring_packed_desc *desc)
+ const struct vring_packed_desc *desc)
{
u16 flags;
@@ -2786,10 +2786,10 @@ EXPORT_SYMBOL_GPL(vring_transport_features);
* Returns the size of the vring. This is mainly used for boasting to
* userspace. Unlike other operations, this need not be serialized.
*/
-unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
+unsigned int virtqueue_get_vring_size(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
return vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num;
}
@@ -2819,9 +2819,9 @@ void __virtqueue_unbreak(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(__virtqueue_unbreak);
-bool virtqueue_is_broken(struct virtqueue *_vq)
+bool virtqueue_is_broken(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
return READ_ONCE(vq->broken);
}
@@ -2868,9 +2868,9 @@ void __virtio_unbreak_device(struct virtio_device *dev)
}
EXPORT_SYMBOL_GPL(__virtio_unbreak_device);
-dma_addr_t virtqueue_get_desc_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_desc_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2881,9 +2881,9 @@ dma_addr_t virtqueue_get_desc_addr(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_get_desc_addr);
-dma_addr_t virtqueue_get_avail_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2895,9 +2895,9 @@ dma_addr_t virtqueue_get_avail_addr(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_get_avail_addr);
-dma_addr_t virtqueue_get_used_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_used_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2910,7 +2910,7 @@ dma_addr_t virtqueue_get_used_addr(struct virtqueue *_vq)
EXPORT_SYMBOL_GPL(virtqueue_get_used_addr);
/* Only available for split ring */
-const struct vring *virtqueue_get_vring(struct virtqueue *vq)
+const struct vring *virtqueue_get_vring(const struct virtqueue *vq)
{
return &to_vvq(vq)->split.vring;
}
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 2b472514c49b..c4225653f949 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -84,14 +84,14 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
void *virtqueue_detach_unused_buf(struct virtqueue *vq);
-unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
+unsigned int virtqueue_get_vring_size(const struct virtqueue *vq);
-bool virtqueue_is_broken(struct virtqueue *vq);
+bool virtqueue_is_broken(const struct virtqueue *vq);
-const struct vring *virtqueue_get_vring(struct virtqueue *vq);
-dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
-dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
-dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);
+const struct vring *virtqueue_get_vring(const struct virtqueue *vq);
+dma_addr_t virtqueue_get_desc_addr(const struct virtqueue *vq);
+dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *vq);
+dma_addr_t virtqueue_get_used_addr(const struct virtqueue *vq);
int virtqueue_resize(struct virtqueue *vq, u32 num,
void (*recycle)(struct virtqueue *vq, void *buf));
@@ -147,7 +147,7 @@ int virtio_device_restore(struct virtio_device *dev);
#endif
void virtio_reset_device(struct virtio_device *dev);
-size_t virtio_max_dma_size(struct virtio_device *vdev);
+size_t virtio_max_dma_size(const struct virtio_device *vdev);
#define virtio_device_for_each_vq(vdev, vq) \
list_for_each_entry(vq, &vdev->vqs, list)
--
2.34.1
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next prev parent reply other threads:[~2023-03-15 18:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 18:54 [PATCH v2 0/3] virtio_ring: Clean up code for virtio ring and pci Feng Liu via Virtualization
2023-03-15 18:54 ` [PATCH v2 1/3] virtio_ring: Allow non power of 2 sizes for packed virtqueue Feng Liu via Virtualization
2023-03-17 3:16 ` Jason Wang
2023-03-30 18:21 ` Feng Liu via Virtualization
2023-03-17 9:16 ` David Edmondson
2023-03-15 18:54 ` [PATCH v2 2/3] virtio_ring: Avoid using inline for small functions Feng Liu via Virtualization
2023-03-17 3:16 ` Jason Wang
2023-03-30 18:22 ` Feng Liu via Virtualization
2023-03-17 9:16 ` David Edmondson
2023-03-15 18:54 ` Feng Liu via Virtualization [this message]
2023-03-17 3:17 ` [PATCH v2 3/3] virtio_ring: Use const to annotate read-only pointer params Jason Wang
2023-03-30 18:22 ` Feng Liu via Virtualization
2023-03-30 20:27 ` Michael S. Tsirkin
2023-03-30 23:46 ` Feng Liu via Virtualization
2023-03-17 9:20 ` David Edmondson
2023-03-31 4:20 ` [PATCH v2 0/3] virtio_ring: Clean up code for virtio ring and pci Xuan Zhuo
-- strict thread matches above, loose matches on Subject: below --
2023-03-10 5:34 Feng Liu via Virtualization
2023-03-10 5:34 ` [PATCH v2 3/3] virtio_ring: Use const to annotate read-only pointer params Feng Liu via Virtualization
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