[v5,2/2] examples/vhost: unconfigure DMA vchannel
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Commit Message
From: Xuan Ding <xuan.ding@intel.com>
This patch applies rte_vhost_async_dma_unconfigure() to manually free
DMA vchannels. Before unconfiguration, make sure the specified DMA
device is no longer used by any vhost ports.
Signed-off-by: Xuan Ding <xuan.ding@intel.com>
---
examples/vhost/main.c | 40 +++++++++++++++++++++++++++-------------
1 file changed, 27 insertions(+), 13 deletions(-)
@@ -73,6 +73,7 @@ static int total_num_mbufs = NUM_MBUFS_DEFAULT;
struct dma_for_vhost dma_bind[RTE_MAX_VHOST_DEVICE];
int16_t dmas_id[RTE_DMADEV_DEFAULT_MAX];
+int16_t dma_ref_count[RTE_DMADEV_DEFAULT_MAX];
static int dma_count;
/* mask of enabled ports */
@@ -371,6 +372,7 @@ open_dma(const char *value)
done:
(dma_info + socketid)->dmas[vring_id].dev_id = dev_id;
(dma_info + socketid)->async_flag |= async_flag;
+ dma_ref_count[dev_id]++;
i++;
}
out:
@@ -1562,6 +1564,29 @@ vhost_clear_queue(struct vhost_dev *vdev, uint16_t queue_id)
}
}
+static void
+vhost_clear_async(struct vhost_dev *vdev, int vid, uint16_t queue_id)
+{
+ int16_t dma_id;
+
+ if (!dma_bind[vid].dmas[queue_id].async_enabled)
+ return;
+
+ vhost_clear_queue(vdev, queue_id);
+ rte_vhost_async_channel_unregister(vid, queue_id);
+ dma_bind[vid].dmas[queue_id].async_enabled = false;
+
+ dma_id = dma_bind[vid2socketid[vdev->vid]].dmas[queue_id].dev_id;
+ dma_ref_count[dma_id]--;
+
+ if (dma_ref_count[dma_id] > 0)
+ return;
+
+ if (rte_vhost_async_dma_unconfigure(dma_id, 0) < 0)
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "Failed to unconfigure DMA %d in vhost.\n", dma_id);
+}
+
/*
* Remove a device from the specific data core linked list and from the
* main linked list. Synchronization occurs through the use of the
@@ -1618,17 +1643,8 @@ destroy_device(int vid)
"(%d) device has been removed from data core\n",
vdev->vid);
- if (dma_bind[vid].dmas[VIRTIO_RXQ].async_enabled) {
- vhost_clear_queue(vdev, VIRTIO_RXQ);
- rte_vhost_async_channel_unregister(vid, VIRTIO_RXQ);
- dma_bind[vid].dmas[VIRTIO_RXQ].async_enabled = false;
- }
-
- if (dma_bind[vid].dmas[VIRTIO_TXQ].async_enabled) {
- vhost_clear_queue(vdev, VIRTIO_TXQ);
- rte_vhost_async_channel_unregister(vid, VIRTIO_TXQ);
- dma_bind[vid].dmas[VIRTIO_TXQ].async_enabled = false;
- }
+ vhost_clear_async(vdev, vid, VIRTIO_RXQ);
+ vhost_clear_async(vdev, vid, VIRTIO_TXQ);
rte_free(vdev);
}
@@ -1690,8 +1706,6 @@ vhost_async_channel_register(int vid)
return rx_ret | tx_ret;
}
-
-
/*
* A new device is added to a data core. First the device is added to the main linked list
* and then allocated to a specific data core.