[v2,2/8] net/virtio: introduce DMA ops
diff mbox series

Message ID 20200925123113.68916-3-maxime.coquelin@redhat.com
State Superseded
Delegated to: Maxime Coquelin
Headers show
Series
  • virtio-user: introduce vhost-vdpa backend
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Context Check Description
ci/checkpatch success coding style OK

Commit Message

Maxime Coquelin Sept. 25, 2020, 12:31 p.m. UTC
Add DMA map/unmap callbacks to the virtio_user pmd, which could
be leveraged by vdev bus driver to map memory for backend
devices with DMA capability.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_user/vhost.h  |  4 ++
 drivers/net/virtio/virtio_user_ethdev.c | 54 +++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

Patch
diff mbox series

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index 8f49ef4574..2e71995a79 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -105,6 +105,10 @@  struct virtio_user_backend_ops {
 	int (*enable_qp)(struct virtio_user_dev *dev,
 			 uint16_t pair_idx,
 			 int enable);
+	int (*dma_map)(struct virtio_user_dev *dev, void *addr,
+				  uint64_t iova, size_t len);
+	int (*dma_unmap)(struct virtio_user_dev *dev, void *addr,
+				  uint64_t iova, size_t len);
 };
 
 extern struct virtio_user_backend_ops virtio_ops_user;
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index 87f6cb6950..60d17af888 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -818,9 +818,63 @@  virtio_user_pmd_remove(struct rte_vdev_device *vdev)
 	return 0;
 }
 
+static int virtio_user_pmd_dma_map(struct rte_vdev_device *vdev, void *addr,
+		uint64_t iova, size_t len)
+{
+	const char *name;
+	struct rte_eth_dev *eth_dev;
+	struct virtio_user_dev *dev;
+	struct virtio_hw *hw;
+
+	if (!vdev)
+		return -EINVAL;
+
+	name = rte_vdev_device_name(vdev);
+	eth_dev = rte_eth_dev_allocated(name);
+	/* Port has already been released by close. */
+	if (!eth_dev)
+		return 0;
+
+	hw = (struct virtio_hw *)eth_dev->data->dev_private;
+	dev = hw->virtio_user_dev;
+
+	if (dev->ops->dma_map)
+		return dev->ops->dma_map(dev, addr, iova, len);
+
+	return 0;
+}
+
+static int virtio_user_pmd_dma_unmap(struct rte_vdev_device *vdev, void *addr,
+		uint64_t iova, size_t len)
+{
+	const char *name;
+	struct rte_eth_dev *eth_dev;
+	struct virtio_user_dev *dev;
+	struct virtio_hw *hw;
+
+	if (!vdev)
+		return -EINVAL;
+
+	name = rte_vdev_device_name(vdev);
+	eth_dev = rte_eth_dev_allocated(name);
+	/* Port has already been released by close. */
+	if (!eth_dev)
+		return 0;
+
+	hw = (struct virtio_hw *)eth_dev->data->dev_private;
+	dev = hw->virtio_user_dev;
+
+	if (dev->ops->dma_unmap)
+		return dev->ops->dma_unmap(dev, addr, iova, len);
+
+	return 0;
+}
+
 static struct rte_vdev_driver virtio_user_driver = {
 	.probe = virtio_user_pmd_probe,
 	.remove = virtio_user_pmd_remove,
+	.dma_map = virtio_user_pmd_dma_map,
+	.dma_unmap = virtio_user_pmd_dma_unmap,
 };
 
 RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);