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Date: Wed, 13 May 2020 12:12:00 +0800
From: Jason Wang <jasowang@...hat.com>
To: Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: lulu@...hat.com, dan.daly@...el.com, cunming.liang@...el.com
Subject: Re: [PATCH V2] ifcvf: move IRQ request/free to status change handlers
On 2020/5/12 下午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@...el.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");
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