[dpdk-dev] [PATCH] cast used->idx to volatile
Linhaifeng
haifeng.lin at huawei.com
Mon Mar 23 03:29:33 CET 2015
cc changchun.ouyang at intel.com
cc huawei.xie at intel.com
On 2015/3/21 16:07, linhaifeng wrote:
> From: Linhaifeng <haifeng.lin at huawei.com>
>
> Same as rte_vhost_enqueue_burst we should cast used->idx
> to volatile before notify guest.
>
> Signed-off-by: Linhaifeng <haifeng.lin at huawei.com>
> ---
> lib/librte_vhost/vhost_rxtx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c
> index 535c7a1..8d674d1 100644
> --- a/lib/librte_vhost/vhost_rxtx.c
> +++ b/lib/librte_vhost/vhost_rxtx.c
> @@ -722,7 +722,7 @@ rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
> }
>
> rte_compiler_barrier();
> - vq->used->idx += entry_success;
> + *(volatile uint16_t *)&vq->used->idx += entry_success;
> /* Kick guest if required. */
> if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
> eventfd_write((int)vq->callfd, 1);
>
--
Regards,
Haifeng
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