Re: [PATCH v7 17/26] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET

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在 2022/3/8 下午8:35, Xuan Zhuo 写道:
This patch implements virtio pci support for QUEUE RESET.

Performing reset on a queue is divided into these steps:

  1. virtio_reset_vq()              - notify the device to reset the queue
  2. virtqueue_detach_unused_buf()  - recycle the buffer submitted
  3. virtqueue_reset_vring()        - reset the vring (may re-alloc)
  4. virtio_enable_resetq()         - mmap vring to device, and enable the queue

This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
pci scenario.

Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
  drivers/virtio/virtio_pci_common.c |  8 +--
  drivers/virtio/virtio_pci_modern.c | 83 ++++++++++++++++++++++++++++++
  2 files changed, 88 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index fdbde1db5ec5..863d3a8a0956 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
  	struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
  	unsigned long flags;
- spin_lock_irqsave(&vp_dev->lock, flags);
-	list_del(&info->node);
-	spin_unlock_irqrestore(&vp_dev->lock, flags);
+	if (!vq->reset) {
+		spin_lock_irqsave(&vp_dev->lock, flags);
+		list_del(&info->node);
+		spin_unlock_irqrestore(&vp_dev->lock, flags);
+	}
vp_dev->del_vq(info);
  	kfree(info);
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 49a4493732cf..3c67d3607802 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features)
  	if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
  			pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
  		__virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
+
+	if (features & BIT_ULL(VIRTIO_F_RING_RESET))
+		__virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
  }
/* virtio config->finalize_features() implementation */
@@ -199,6 +202,82 @@ static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
  	return 0;
  }
+static int vp_modern_reset_vq(struct virtqueue *vq)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+	struct virtio_pci_vq_info *info;
+	unsigned long flags;
+	unsigned int irq;
+
+	if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
+		return -ENOENT;
+
+	vp_modern_set_queue_reset(mdev, vq->index);
+
+	info = vp_dev->vqs[vq->index];
+
+	/* delete vq from irq handler */
+	spin_lock_irqsave(&vp_dev->lock, flags);
+	list_del(&info->node);
+	spin_unlock_irqrestore(&vp_dev->lock, flags);
+
+	INIT_LIST_HEAD(&info->node);
+
+	vq->reset = VIRTIO_VQ_RESET_STEP_DEVICE;
+
+	/* sync irq callback. */
+	if (vp_dev->intx_enabled) {
+		irq = vp_dev->pci_dev->irq;
+
+	} else {
+		if (info->msix_vector == VIRTIO_MSI_NO_VECTOR)
+			return 0;
+
+		irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
+	}
+
+	synchronize_irq(irq);


Synchronize_irq() is not sufficient here since it breaks the effort of the interrupt hardening which is done by commits:

080cd7c3ac87 virtio-pci: harden INTX interrupts
9e35276a5344 virtio_pci: harden MSI-X interrupts

Unfortunately  080cd7c3ac87 introduces an issue that disable_irq() were used for the affinity managed irq but we're discussing a fix.


+
+	return 0;
+}
+
+static int vp_modern_enable_reset_vq(struct virtqueue *vq)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+	struct virtio_pci_vq_info *info;
+	unsigned long flags, index;
+	int err;
+
+	if (vq->reset != VIRTIO_VQ_RESET_STEP_VRING_ATTACH)
+		return -EBUSY;
+
+	index = vq->index;
+	info = vp_dev->vqs[index];
+
+	/* check queue reset status */
+	if (vp_modern_get_queue_reset(mdev, index) != 1)
+		return -EBUSY;
+
+	err = vp_active_vq(vq, info->msix_vector);
+	if (err)
+		return err;
+
+	if (vq->callback) {
+		spin_lock_irqsave(&vp_dev->lock, flags);
+		list_add(&info->node, &vp_dev->virtqueues);
+		spin_unlock_irqrestore(&vp_dev->lock, flags);
+	} else {
+		INIT_LIST_HEAD(&info->node);
+	}
+
+	vp_modern_set_queue_enable(&vp_dev->mdev, index, true);


Any reason we need to check queue_enable() here?

Thanks


+	vq->reset = VIRTIO_VQ_RESET_STEP_NONE;
+
+	return 0;
+}
+
  static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
  {
  	return vp_modern_config_vector(&vp_dev->mdev, vector);
@@ -407,6 +486,8 @@ static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
  	.set_vq_affinity = vp_set_vq_affinity,
  	.get_vq_affinity = vp_get_vq_affinity,
  	.get_shm_region  = vp_get_shm_region,
+	.reset_vq	 = vp_modern_reset_vq,
+	.enable_reset_vq = vp_modern_enable_reset_vq,
  };
static const struct virtio_config_ops virtio_pci_config_ops = {
@@ -425,6 +506,8 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
  	.set_vq_affinity = vp_set_vq_affinity,
  	.get_vq_affinity = vp_get_vq_affinity,
  	.get_shm_region  = vp_get_shm_region,
+	.reset_vq	 = vp_modern_reset_vq,
+	.enable_reset_vq = vp_modern_enable_reset_vq,
  };
/* the PCI probing function */




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