virtio: record the maximum queue num supported by the device.

virtio-net can display the maximum (supported by hardware) ring size in
ethtool -g eth0.

When the subsequent patch implements vring reset, it can judge whether
the ring size passed by the driver is legal based on this.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-2-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c
index 82ff378..e719af8 100644 (file)
--- a/arch/um/drivers/virtio_uml.c
+++ b/arch/um/drivers/virtio_uml.c
@@ -958,6 +958,7 @@ static struct virtqueue *vu_setup_vq(struct virtio_device *vdev,
                goto error_create;
        }
        vq->priv = info;
+       vq->num_max = num;
        num = virtqueue_get_vring_size(vq);
 
        if (vu_dev->protocol_features &

diff --git a/drivers/platform/mellanox/mlxbf-tmfifo.c b/drivers/platform/mellanox/mlxbf-tmfifo.c
index 38800e8..1ae3c56 100644 (file)
--- a/drivers/platform/mellanox/mlxbf-tmfifo.c
+++ b/drivers/platform/mellanox/mlxbf-tmfifo.c
@@ -959,6 +959,8 @@ static int mlxbf_tmfifo_virtio_find_vqs(struct virtio_device *vdev,
                        goto error;
                }
 
+               vq->num_max = vring->num;
+
                vqs[i] = vq;
                vring->vq = vq;
                vq->priv = vring;

diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index d43d747..0f7706e 100644 (file)
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -125,6 +125,8 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
                return ERR_PTR(-ENOMEM);
        }
 
+       vq->num_max = num;
+
        rvring->vq = vq;
        vq->priv = rvring;
 

diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 161d3b1..6b86d02 100644 (file)
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -530,6 +530,9 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
                err = -ENOMEM;
                goto out_err;
        }
+
+       vq->num_max = info->num;
+
        /* it may have been reduced */
        info->num = virtqueue_get_vring_size(vq);
 

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 945cb8f..3ff746e 100644 (file)
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -403,6 +403,8 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
                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 a5e5721..2257f1b 100644 (file)
--- 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 623906b..e7e0b8c 100644 (file)
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -218,6 +218,8 @@ 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_vdpa.c b/drivers/virtio/virtio_vdpa.c
index c40f7de..9670cc7 100644 (file)
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -183,6 +183,8 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
                goto error_new_virtqueue;
        }
 
+       vq->num_max = max_num;
+
        /* Setup virtqueue callback */
        cb.callback = callback ? virtio_vdpa_virtqueue_cb : NULL;
        cb.private = info;

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index d8fdf17..129bde7 100644 (file)
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -19,6 +19,7 @@
  * @priv: a pointer for the virtqueue implementation to use.
  * @index: the zero-based ordinal number for this queue.
  * @num_free: number of elements we expect to be able to fit.
+ * @num_max: the maximum number of elements supported by the device.
  *
  * A note on @num_free: with indirect buffers, each buffer needs one
  * element in the queue, otherwise a buffer will need one element per
@@ -31,6 +32,7 @@ struct virtqueue {
        struct virtio_device *vdev;
        unsigned int index;
        unsigned int num_free;
+       unsigned int num_max;
        void *priv;
 };