[PATCH v5 18/22] virtio: add helper virtqueue_get_vring_max_size()
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-02-14 08:15:04
Also in:
bpf, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, Eugenio Pérez
Record the maximum queue num supported by the device. virtio-net can display the maximum (supported by hardware) ring size in ethtool -g eth0. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/virtio/virtio_mmio.c | 2 ++ drivers/virtio/virtio_pci_legacy.c | 2 ++ drivers/virtio/virtio_pci_modern.c | 2 ++ drivers/virtio/virtio_ring.c | 13 +++++++++++++ include/linux/virtio.h | 2 ++ 5 files changed, 21 insertions(+)
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 56128b9c46eb..a41abc8051b9 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c@@ -390,6 +390,8 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index, goto error_new_virtqueue; } + vq->num_max = num; + /* Activate the queue */ writel(virtqueue_get_vring_size(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NUM); if (vm_dev->version == 1) {
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index 96ec2b04e97d..340149f6196d 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c@@ -135,6 +135,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, if (!vq) return ERR_PTR(-ENOMEM); + vq->num_max = num; + q_pfn = virtqueue_get_desc_addr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT; if (q_pfn >> 32) { dev_err(&vp_dev->pci_dev->dev,
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 7d28f4c36fc2..5811691a90ec 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c@@ -274,6 +274,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, if (!vq) return ERR_PTR(-ENOMEM); + vq->num_max = num; + /* activate the queue */ vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq)); vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 6a892c8ea16e..1a123b5e5371 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -2447,6 +2447,19 @@ void vring_transport_features(struct virtio_device *vdev) } EXPORT_SYMBOL_GPL(vring_transport_features); +/** + * virtqueue_get_vring_max_size - return the max size of the virtqueue's vring + * @_vq: the struct virtqueue containing the vring of interest. + * + * Returns the max 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_max_size(struct virtqueue *_vq) +{ + return _vq->num_max; +} +EXPORT_SYMBOL_GPL(virtqueue_get_vring_max_size); + /** * virtqueue_get_vring_size - return the size of the virtqueue's vring * @_vq: the struct virtqueue containing the vring of interest.
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index cdb2a551257c..1153b093c53d 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h@@ -37,6 +37,7 @@ struct virtqueue { struct virtio_device *vdev; unsigned int index; unsigned int num_free; + unsigned int num_max; void *priv; enum virtqueue_reset_stage reset; };
@@ -87,6 +88,7 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *vq); void *virtqueue_detach_unused_buf(struct virtqueue *vq); +unsigned int virtqueue_get_vring_max_size(struct virtqueue *vq); unsigned int virtqueue_get_vring_size(struct virtqueue *vq); bool virtqueue_is_broken(struct virtqueue *vq);
--
2.31.0