Jason Wang
2020-May-13 04:12 UTC
[PATCH V2] ifcvf: move IRQ request/free to status change handlers
On 2020/5/12 ??4:00, Zhu Lingshan wrote:> This commit move IRQ request and free operations from probe() > to VIRTIO status change handler to comply with VIRTIO spec. > > VIRTIO spec 1.1, section 2.1.2 Device Requirements: Device Status Field > The device MUST NOT consume buffers or send any used buffer > notifications to the driver before DRIVER_OK.This comment needs to be checked as I said previously. It's only needed if we're sure ifcvf can generate interrupt before DRIVER_OK.> > Signed-off-by: Zhu Lingshan <lingshan.zhu at intel.com> > --- > changes from V1: > remove ifcvf_stop_datapath() in status == 0 handler, we don't need to do this > twice; handle status == 0 after DRIVER_OK -> !DRIVER_OK handler (Jason Wang)Patch looks good to me, but with this patch ping cannot work on my machine. (It works without this patch). Thanks> > drivers/vdpa/ifcvf/ifcvf_main.c | 120 ++++++++++++++++++++++++---------------- > 1 file changed, 73 insertions(+), 47 deletions(-) > > diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c > index abf6a061..d529ed6 100644 > --- a/drivers/vdpa/ifcvf/ifcvf_main.c > +++ b/drivers/vdpa/ifcvf/ifcvf_main.c > @@ -28,6 +28,60 @@ static irqreturn_t ifcvf_intr_handler(int irq, void *arg) > return IRQ_HANDLED; > } > > +static void ifcvf_free_irq_vectors(void *data) > +{ > + pci_free_irq_vectors(data); > +} > + > +static void ifcvf_free_irq(struct ifcvf_adapter *adapter, int queues) > +{ > + struct pci_dev *pdev = adapter->pdev; > + struct ifcvf_hw *vf = &adapter->vf; > + int i; > + > + > + for (i = 0; i < queues; i++) > + devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]); > + > + ifcvf_free_irq_vectors(pdev); > +} > + > +static int ifcvf_request_irq(struct ifcvf_adapter *adapter) > +{ > + struct pci_dev *pdev = adapter->pdev; > + struct ifcvf_hw *vf = &adapter->vf; > + int vector, i, ret, irq; > + > + ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR, > + IFCVF_MAX_INTR, PCI_IRQ_MSIX); > + if (ret < 0) { > + IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n"); > + return ret; > + } > + > + for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { > + snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n", > + pci_name(pdev), i); > + vector = i + IFCVF_MSI_QUEUE_OFF; > + irq = pci_irq_vector(pdev, vector); > + ret = devm_request_irq(&pdev->dev, irq, > + ifcvf_intr_handler, 0, > + vf->vring[i].msix_name, > + &vf->vring[i]); > + if (ret) { > + IFCVF_ERR(pdev, > + "Failed to request irq for vq %d\n", i); > + ifcvf_free_irq(adapter, i); > + > + return ret; > + } > + > + vf->vring[i].irq = irq; > + } > + > + return 0; > +} > + > static int ifcvf_start_datapath(void *private) > { > struct ifcvf_hw *vf = ifcvf_private_to_vf(private); > @@ -118,17 +172,34 @@ static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status) > { > struct ifcvf_adapter *adapter; > struct ifcvf_hw *vf; > + u8 status_old; > + int ret; > > vf = vdpa_to_vf(vdpa_dev); > adapter = dev_get_drvdata(vdpa_dev->dev.parent); > + status_old = ifcvf_get_status(vf); > > - if (status == 0) { > + if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && > + !(status & VIRTIO_CONFIG_S_DRIVER_OK)) { > ifcvf_stop_datapath(adapter); > + ifcvf_free_irq(adapter, IFCVF_MAX_QUEUE_PAIRS * 2); > + } > + > + if (status == 0) { > ifcvf_reset_vring(adapter); > return; > } > > - if (status & VIRTIO_CONFIG_S_DRIVER_OK) { > + if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && > + !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) { > + ret = ifcvf_request_irq(adapter); > + if (ret) { > + status = ifcvf_get_status(vf); > + status |= VIRTIO_CONFIG_S_FAILED; > + ifcvf_set_status(vf, status); > + return; > + } > + > if (ifcvf_start_datapath(adapter) < 0) > IFCVF_ERR(adapter->pdev, > "Failed to set ifcvf vdpa status %u\n", > @@ -284,38 +355,6 @@ static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev, > .set_config_cb = ifcvf_vdpa_set_config_cb, > }; > > -static int ifcvf_request_irq(struct ifcvf_adapter *adapter) > -{ > - struct pci_dev *pdev = adapter->pdev; > - struct ifcvf_hw *vf = &adapter->vf; > - int vector, i, ret, irq; > - > - > - for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { > - snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n", > - pci_name(pdev), i); > - vector = i + IFCVF_MSI_QUEUE_OFF; > - irq = pci_irq_vector(pdev, vector); > - ret = devm_request_irq(&pdev->dev, irq, > - ifcvf_intr_handler, 0, > - vf->vring[i].msix_name, > - &vf->vring[i]); > - if (ret) { > - IFCVF_ERR(pdev, > - "Failed to request irq for vq %d\n", i); > - return ret; > - } > - vf->vring[i].irq = irq; > - } > - > - return 0; > -} > - > -static void ifcvf_free_irq_vectors(void *data) > -{ > - pci_free_irq_vectors(data); > -} > - > static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id) > { > struct device *dev = &pdev->dev; > @@ -349,13 +388,6 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id) > return ret; > } > > - ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR, > - IFCVF_MAX_INTR, PCI_IRQ_MSIX); > - if (ret < 0) { > - IFCVF_ERR(pdev, "Failed to alloc irq vectors\n"); > - return ret; > - } > - > ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev); > if (ret) { > IFCVF_ERR(pdev, > @@ -379,12 +411,6 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id) > adapter->pdev = pdev; > adapter->vdpa.dma_dev = &pdev->dev; > > - ret = ifcvf_request_irq(adapter); > - if (ret) { > - IFCVF_ERR(pdev, "Failed to request MSI-X irq\n"); > - goto err; > - } > - > ret = ifcvf_init_hw(vf, pdev); > if (ret) { > IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");