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net/virtio: add barrier in interrupt enable

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Typically, after enabling Rx interrupt, a check should be done
to make sure that there is no new incoming packets before going
to sleep. So a barrier is needed to make sure that any following
check won't happen before the interrupt is actually enabled.

Fixes: c056be239d ("net/virtio: add Rx interrupt enable/disable functions")
Cc: stable@dpdk.org

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Tiwei Bie 2019-03-19 14:43:05 +08:00 committed by Ferruh Yigit
parent c68fee9588
commit 8f66bc4ac3
1 changed files with 2 additions and 0 deletions
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2
drivers/net/virtio/virtio_ethdev.c
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@ -850,10 +850,12 @@ virtio_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
static int
virtio_dev_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id)
{
struct virtio_hw *hw = dev->data->dev_private;
struct virtnet_rx *rxvq = dev->data->rx_queues[queue_id];
struct virtqueue *vq = rxvq->vq;
virtqueue_enable_intr(vq);
virtio_mb(hw->weak_barriers);
return 0;
}