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Message-ID: <CACLfguVco8m+eQv2BFOmx-qgrEQG2OTz-R7bP6BxVunUM2z8CQ@mail.gmail.com>
Date: Fri, 29 Apr 2022 16:48:18 +0800
From: Cindy Lu <lulu@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: mst@...hat.com, virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] vdpa/vp_vdpa : add vdpa tool support in vp_vdpa
On Fri, Apr 29, 2022 at 12:14 PM Jason Wang <jasowang@...hat.com> wrote:
>
>
> 在 2022/4/28 15:37, Cindy Lu 写道:
> > this patch is to add the support for vdpa tool in vp_vdpa
> > here is the example steps
> >
> > modprobe vp_vdpa
> > modprobe vhost_vdpa
> > echo 0000:00:06.0>/sys/bus/pci/drivers/virtio-pci/unbind
> > echo 1af4 1041 > /sys/bus/pci/drivers/vp-vdpa/new_id
> >
> > vdpa dev add name vdpa1 mgmtdev pci/0000:00:06.0
> >
> > Signed-off-by: Cindy Lu <lulu@...hat.com>
> > ---
> > drivers/vdpa/virtio_pci/vp_vdpa.c | 159 ++++++++++++++++++++++++------
> > include/linux/vdpa.h | 2 +-
> > 2 files changed, 128 insertions(+), 33 deletions(-)
> >
> > diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
> > index cce101e6a940..a3827e496b8f 100644
> > --- a/drivers/vdpa/virtio_pci/vp_vdpa.c
> > +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
> > @@ -32,7 +32,7 @@ struct vp_vring {
> >
> > struct vp_vdpa {
> > struct vdpa_device vdpa;
> > - struct virtio_pci_modern_device mdev;
> > + struct virtio_pci_modern_device *mdev;
> > struct vp_vring *vring;
> > struct vdpa_callback config_cb;
> > char msix_name[VP_VDPA_NAME_SIZE];
> > @@ -41,6 +41,12 @@ struct vp_vdpa {
> > int vectors;
> > };
> >
> > +struct vp_vdpa_mgmtdev {
> > + struct vdpa_mgmt_dev mgtdev;
> > + struct virtio_pci_modern_device *mdev;
> > + struct vp_vdpa *vp_vdpa;
> > +};
> > +
> > static struct vp_vdpa *vdpa_to_vp(struct vdpa_device *vdpa)
> > {
> > return container_of(vdpa, struct vp_vdpa, vdpa);
> > @@ -50,7 +56,12 @@ static struct virtio_pci_modern_device *vdpa_to_mdev(struct vdpa_device *vdpa)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> >
> > - return &vp_vdpa->mdev;
> > + return vp_vdpa->mdev;
> > +}
> > +
> > +static struct virtio_pci_modern_device *vp_vdpa_to_mdev(struct vp_vdpa *vp_vdpa)
> > +{
> > + return vp_vdpa->mdev;
> > }
> >
> > static u64 vp_vdpa_get_device_features(struct vdpa_device *vdpa)
> > @@ -96,7 +107,7 @@ static int vp_vdpa_get_vq_irq(struct vdpa_device *vdpa, u16 idx)
> >
> > static void vp_vdpa_free_irq(struct vp_vdpa *vp_vdpa)
> > {
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > struct pci_dev *pdev = mdev->pci_dev;
> > int i;
> >
> > @@ -143,7 +154,7 @@ static irqreturn_t vp_vdpa_config_handler(int irq, void *arg)
> >
> > static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
> > {
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > struct pci_dev *pdev = mdev->pci_dev;
> > int i, ret, irq;
> > int queues = vp_vdpa->queues;
> > @@ -198,7 +209,7 @@ static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
> > static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > u8 s = vp_vdpa_get_status(vdpa);
> >
> > if (status & VIRTIO_CONFIG_S_DRIVER_OK &&
> > @@ -212,7 +223,7 @@ static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
> > static int vp_vdpa_reset(struct vdpa_device *vdpa)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > u8 s = vp_vdpa_get_status(vdpa);
> >
> > vp_modern_set_status(mdev, 0);
> > @@ -372,7 +383,7 @@ static void vp_vdpa_get_config(struct vdpa_device *vdpa,
> > void *buf, unsigned int len)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > u8 old, new;
> > u8 *p;
> > int i;
> > @@ -392,7 +403,7 @@ static void vp_vdpa_set_config(struct vdpa_device *vdpa,
> > unsigned int len)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > const u8 *p = buf;
> > int i;
> >
> > @@ -412,7 +423,7 @@ static struct vdpa_notification_area
> > vp_vdpa_get_vq_notification(struct vdpa_device *vdpa, u16 qid)
> > {
> > struct vp_vdpa *vp_vdpa = vdpa_to_vp(vdpa);
> > - struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_to_mdev(vp_vdpa);
> > struct vdpa_notification_area notify;
> >
> > notify.addr = vp_vdpa->vring[qid].notify_pa;
> > @@ -454,38 +465,31 @@ static void vp_vdpa_free_irq_vectors(void *data)
> > pci_free_irq_vectors(data);
> > }
> >
> > -static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > +static int vp_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
> > + const struct vdpa_dev_set_config *add_config)
> > {
> > - struct virtio_pci_modern_device *mdev;
> > + struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
> > + container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
> > +
> > + struct virtio_pci_modern_device *mdev = vp_vdpa_mgtdev->mdev;
> > + struct pci_dev *pdev = mdev->pci_dev;
> > struct device *dev = &pdev->dev;
> > - struct vp_vdpa *vp_vdpa;
> > + struct vp_vdpa *vp_vdpa = NULL;
> > int ret, i;
> >
> > - ret = pcim_enable_device(pdev);
> > - if (ret)
> > - return ret;
> > + vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa, dev, &vp_vdpa_ops,
> > + name, false);
> >
> > - vp_vdpa = vdpa_alloc_device(struct vp_vdpa, vdpa,
> > - dev, &vp_vdpa_ops, NULL, false);
> > if (IS_ERR(vp_vdpa)) {
> > dev_err(dev, "vp_vdpa: Failed to allocate vDPA structure\n");
> > return PTR_ERR(vp_vdpa);
> > }
> >
> > - mdev = &vp_vdpa->mdev;
> > - mdev->pci_dev = pdev;
> > -
> > - ret = vp_modern_probe(mdev);
> > - if (ret) {
> > - dev_err(&pdev->dev, "Failed to probe modern PCI device\n");
> > - goto err;
> > - }
> > -
> > - pci_set_master(pdev);
> > - pci_set_drvdata(pdev, vp_vdpa);
> > + vp_vdpa_mgtdev->vp_vdpa = vp_vdpa;
> >
> > vp_vdpa->vdpa.dma_dev = &pdev->dev;
> > vp_vdpa->queues = vp_modern_get_num_queues(mdev);
> > + vp_vdpa->mdev = mdev;
> >
> > ret = devm_add_action_or_reset(dev, vp_vdpa_free_irq_vectors, pdev);
> > if (ret) {
> > @@ -516,7 +520,8 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > }
> > vp_vdpa->config_irq = VIRTIO_MSI_NO_VECTOR;
> >
> > - ret = vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues);
> > + vp_vdpa->vdpa.mdev = &vp_vdpa_mgtdev->mgtdev;
> > + ret = _vdpa_register_device(&vp_vdpa->vdpa, vp_vdpa->queues);
> > if (ret) {
> > dev_err(&pdev->dev, "Failed to register to vdpa bus\n");
> > goto err;
> > @@ -529,12 +534,102 @@ static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > return ret;
> > }
> >
> > +static void vp_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev,
> > + struct vdpa_device *dev)
> > +{
> > + struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev =
> > + container_of(v_mdev, struct vp_vdpa_mgmtdev, mgtdev);
> > +
> > + struct vp_vdpa *vp_vdpa = vp_vdpa_mgtdev->vp_vdpa;
> > +
> > + _vdpa_unregister_device(&vp_vdpa->vdpa);
> > + vp_vdpa_mgtdev->vp_vdpa = NULL;
> > +}
> > +
> > +static const struct vdpa_mgmtdev_ops vp_vdpa_mdev_ops = {
> > + .dev_add = vp_vdpa_dev_add,
> > + .dev_del = vp_vdpa_dev_del,
> > +};
> > +
> > +static int vp_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> > +{
> > + struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = NULL;
> > + struct vdpa_mgmt_dev *mgtdev;
> > + struct device *dev = &pdev->dev;
> > + struct virtio_pci_modern_device *mdev = NULL;
> > + struct virtio_device_id *mdev_id = NULL;
> > + int err;
> > +
> > + vp_vdpa_mgtdev = kzalloc(sizeof(*vp_vdpa_mgtdev), GFP_KERNEL);
> > + if (!vp_vdpa_mgtdev)
> > + return -ENOMEM;
> > +
> > + mgtdev = &vp_vdpa_mgtdev->mgtdev;
> > + mgtdev->ops = &vp_vdpa_mdev_ops;
> > + mgtdev->device = dev;
> > +
> > + mdev = kzalloc(sizeof(struct virtio_pci_modern_device), GFP_KERNEL);
> > + if (!mdev) {
> > + kfree(vp_vdpa_mgtdev);
> > + return -ENOMEM;
> > + }
> > +
> > + mdev_id = kzalloc(sizeof(struct virtio_device_id), GFP_KERNEL);
> > + if (!mdev_id) {
> > + kfree(mdev);
> > + kfree(vp_vdpa_mgtdev);
> > + return -ENOMEM;
>
>
> Nit: let' use err label for having a consistent rewind.
>
> Other looks good.
>
> Thanks
>
Thanks, Jason, I will post a new version soon
>
> > + }
> > +
> > + vp_vdpa_mgtdev->mdev = mdev;
> > + mdev->pci_dev = pdev;
> > +
> > + err = pcim_enable_device(pdev);
> > + if (err) {
> > + goto err;
> > + }
> > +
> > + err = vp_modern_probe(mdev);
> > + if (err) {
> > + dev_err(&pdev->dev, "Failed to probe modern PCI device\n");
> > + goto err;
> > + }
> > +
> > + mdev_id->device = mdev->id.device;
> > + mdev_id->vendor = mdev->id.vendor;
> > + mgtdev->id_table = mdev_id;
> > +
> > + mgtdev->max_supported_vqs = vp_modern_get_num_queues(mdev);
> > + mgtdev->supported_features = vp_modern_get_features(mdev);
> > + pci_set_master(pdev);
> > + pci_set_drvdata(pdev, vp_vdpa_mgtdev);
> > +
> > + err = vdpa_mgmtdev_register(mgtdev);
> > + if (err) {
> > + dev_err(&pdev->dev, "Failed to register vdpa mgmtdev device\n");
> > + vp_modern_remove(vp_vdpa_mgtdev->mdev);
> > + goto err;
> > + }
> > +
> > + return 0;
> > +err:
> > + kfree(mdev_id);
> > + kfree(mdev);
> > + kfree(vp_vdpa_mgtdev);
> > + return err;
> > +}
> > +
> > static void vp_vdpa_remove(struct pci_dev *pdev)
> > {
> > - struct vp_vdpa *vp_vdpa = pci_get_drvdata(pdev);
> > + struct vp_vdpa_mgmtdev *vp_vdpa_mgtdev = pci_get_drvdata(pdev);
> > + struct virtio_pci_modern_device *mdev = NULL;
> >
> > - vp_modern_remove(&vp_vdpa->mdev);
> > - vdpa_unregister_device(&vp_vdpa->vdpa);
> > + mdev = vp_vdpa_mgtdev->mdev;
> > + vp_modern_remove(mdev);
> > + vdpa_mgmtdev_unregister(&vp_vdpa_mgtdev->mgtdev);
> > + kfree(&vp_vdpa_mgtdev->mgtdev.id_table);
> > + kfree(mdev);
> > + kfree(vp_vdpa_mgtdev);
> > }
> >
> > static struct pci_driver vp_vdpa_driver = {
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index 721089bb4c84..342c454c1623 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -462,7 +462,7 @@ struct vdpa_mgmtdev_ops {
> > struct vdpa_mgmt_dev {
> > struct device *device;
> > const struct vdpa_mgmtdev_ops *ops;
> > - const struct virtio_device_id *id_table;
> > + struct virtio_device_id *id_table;
> > u64 config_attr_mask;
> > struct list_head list;
> > u64 supported_features;
>
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