[dpdk-dev] [PATCH v2 2/8] net/virtio: introduce DMA ops
Maxime Coquelin
maxime.coquelin at redhat.com
Fri Sep 25 14:31:07 CEST 2020
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 at redhat.com>
---
drivers/net/virtio/virtio_user/vhost.h | 4 ++
drivers/net/virtio/virtio_user_ethdev.c | 54 +++++++++++++++++++++++++
2 files changed, 58 insertions(+)
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);
--
2.26.2
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