Jason Wang
2022-Apr-12 02:41 UTC
[PATCH v9 01/32] virtio: add helper virtqueue_get_vring_max_size()
? 2022/4/6 ??11:43, Xuan Zhuo ??:> 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 at linux.alibaba.com> > --- > arch/um/drivers/virtio_uml.c | 1 + > drivers/platform/mellanox/mlxbf-tmfifo.c | 2 ++ > drivers/remoteproc/remoteproc_virtio.c | 2 ++ > drivers/s390/virtio/virtio_ccw.c | 3 +++ > 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 | 14 ++++++++++++++ > drivers/virtio/virtio_vdpa.c | 2 ++ > include/linux/virtio.h | 2 ++ > 10 files changed, 32 insertions(+) > > diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c > index ba562d68dc04..904993d15a85 100644 > --- a/arch/um/drivers/virtio_uml.c > +++ b/arch/um/drivers/virtio_uml.c > @@ -945,6 +945,7 @@ 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 38800e86ed8a..1ae3c56b66b0 100644 > --- 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 70ab496d0431..7611755d0ae2 100644 > --- 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 = len;I wonder if this is correct. It looks to me len is counted in bytes: /** ?* struct rproc_vring - remoteproc vring state ?* @va: virtual address ?* @len: length, in bytes ?* @da: device address ?* @align: vring alignment ?* @notifyid: rproc-specific unique vring index ?* @rvdev: remote vdev ?* @vq: the virtqueue of this vring ?*/ struct rproc_vring { ??????? void *va; ??????? int len; ??????? u32 da; ??????? u32 align; ??????? int notifyid; ??????? struct rproc_vdev *rvdev; ??????? struct virtqueue *vq; }; Other looks good. Thanks> + > rvring->vq = vq; > vq->priv = rvring; > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c > index d35e7a3f7067..468da60b56c5 100644 > --- a/drivers/s390/virtio/virtio_ccw.c > +++ b/drivers/s390/virtio/virtio_ccw.c > @@ -529,6 +529,9 @@ 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 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 34141b9abe27..b68934fe6b5d 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 5455bc041fb6..86d301f272b8 100644 > --- 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_ring.c b/drivers/virtio/virtio_ring.c > index 962f1477b1fa..b87130c8f312 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -2371,6 +2371,20 @@ 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. > + * > + * 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/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c > index 7767a7f0119b..39e4c08eb0f2 100644 > --- 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 = virtio_vdpa_virtqueue_cb; > cb.private = info; > diff --git a/include/linux/virtio.h b/include/linux/virtio.h > index 72292a62cd90..d59adc4be068 100644 > --- a/include/linux/virtio.h > +++ b/include/linux/virtio.h > @@ -31,6 +31,7 @@ struct virtqueue { > struct virtio_device *vdev; > unsigned int index; > unsigned int num_free; > + unsigned int num_max; > void *priv; > }; > > @@ -80,6 +81,7 @@ 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);
Xuan Zhuo
2022-Apr-13 02:24 UTC
[PATCH v9 01/32] virtio: add helper virtqueue_get_vring_max_size()
On Tue, 12 Apr 2022 10:41:03 +0800, Jason Wang <jasowang at redhat.com> wrote:> > ? 2022/4/6 ??11:43, Xuan Zhuo ??: > > 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 at linux.alibaba.com> > > --- > > arch/um/drivers/virtio_uml.c | 1 + > > drivers/platform/mellanox/mlxbf-tmfifo.c | 2 ++ > > drivers/remoteproc/remoteproc_virtio.c | 2 ++ > > drivers/s390/virtio/virtio_ccw.c | 3 +++ > > 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 | 14 ++++++++++++++ > > drivers/virtio/virtio_vdpa.c | 2 ++ > > include/linux/virtio.h | 2 ++ > > 10 files changed, 32 insertions(+) > > > > diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c > > index ba562d68dc04..904993d15a85 100644 > > --- a/arch/um/drivers/virtio_uml.c > > +++ b/arch/um/drivers/virtio_uml.c > > @@ -945,6 +945,7 @@ 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 38800e86ed8a..1ae3c56b66b0 100644 > > --- 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 70ab496d0431..7611755d0ae2 100644 > > --- 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 = len; > > > I wonder if this is correct. > > It looks to me len is counted in bytes: > > /** > ?* struct rproc_vring - remoteproc vring state > ?* @va: virtual address > ?* @len: length, in bytes > ?* @da: device address > ?* @align: vring alignment > ?* @notifyid: rproc-specific unique vring index > ?* @rvdev: remote vdev > ?* @vq: the virtqueue of this vring > ?*/ > struct rproc_vring { > ??????? void *va; > ??????? int len; > ??????? u32 da; > ??????? u32 align; > ??????? int notifyid; > ??????? struct rproc_vdev *rvdev; > ??????? struct virtqueue *vq; > }; >I think this comment is incorrect because here len is passed as num to vring_new_virtqueue(). There is also this usage: /* actual size of vring (in bytes) */ size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); And this value comes from here: static int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) { struct rproc *rproc = rvdev->rproc; struct device *dev = &rproc->dev; struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; struct rproc_vring *rvring = &rvdev->vring[i]; dev_dbg(dev, "vdev rsc: vring%d: da 0x%x, qsz %d, align %d\n", i, vring->da, vring->num, vring->align); /* verify queue size and vring alignment are sane */ if (!vring->num || !vring->align) { dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", vring->num, vring->align); return -EINVAL; } > rvring->len = vring->num; rvring->align = vring->align; rvring->rvdev = rvdev; return 0; } /** * struct fw_rsc_vdev_vring - vring descriptor entry * @da: device address * @align: the alignment between the consumer and producer parts of the vring * @num: num of buffers supported by this vring (must be power of two) * @notifyid: a unique rproc-wide notify index for this vring. This notify * index is used when kicking a remote processor, to let it know that this * vring is triggered. * @pa: physical address * * This descriptor is not a resource entry by itself; it is part of the * vdev resource type (see below). * * Note that @da should either contain the device address where * the remote processor is expecting the vring, or indicate that * dynamically allocation of the vring's device address is supported. */ struct fw_rsc_vdev_vring { u32 da; u32 align; u32 num; u32 notifyid; u32 pa; } __packed; So I think the 'len' here may have changed its meaning in a version update. Thanks.> > Other looks good. > > Thanks > > > > + > > rvring->vq = vq; > > vq->priv = rvring; > > > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c > > index d35e7a3f7067..468da60b56c5 100644 > > --- a/drivers/s390/virtio/virtio_ccw.c > > +++ b/drivers/s390/virtio/virtio_ccw.c > > @@ -529,6 +529,9 @@ 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 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 34141b9abe27..b68934fe6b5d 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 5455bc041fb6..86d301f272b8 100644 > > --- 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_ring.c b/drivers/virtio/virtio_ring.c > > index 962f1477b1fa..b87130c8f312 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -2371,6 +2371,20 @@ 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. > > + * > > + * 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/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c > > index 7767a7f0119b..39e4c08eb0f2 100644 > > --- 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 = virtio_vdpa_virtqueue_cb; > > cb.private = info; > > diff --git a/include/linux/virtio.h b/include/linux/virtio.h > > index 72292a62cd90..d59adc4be068 100644 > > --- a/include/linux/virtio.h > > +++ b/include/linux/virtio.h > > @@ -31,6 +31,7 @@ struct virtqueue { > > struct virtio_device *vdev; > > unsigned int index; > > unsigned int num_free; > > + unsigned int num_max; > > void *priv; > > }; > > > > @@ -80,6 +81,7 @@ 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); >