[dpdk-dev] [PATCH] vhost: fix zmbuf buffer id invalid

[Ye Xiaolong]

For the subject, what about:

vhost: fix invalid zmbuf buffer id

On 02/24, Marvin Liu wrote:
>zc mbufs should record available buffer id when doing dequeue zcopy.
>There's no guarantee that local queue avail index equal to buffer index.

s/equal to/is equal to

>
>Fixes: d1eafb532268 ("vhost: add packed ring zcopy batch and single dequeue")
>Cc: stable at dpdk.org
>
>Signed-off-by: Marvin Liu <yong.liu at intel.com>
>Reported-by: Yinan Wang <yinan.wang at intel.com>
>
>diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
>index 37c47c7dc..210415904 100644
>--- a/lib/librte_vhost/virtio_net.c
>+++ b/lib/librte_vhost/virtio_net.c
>@@ -2004,7 +2004,7 @@ virtio_dev_tx_batch_packed_zmbuf(struct virtio_net *dev,
> 
> 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
> 		zmbufs[i]->mbuf = pkts[i];
>-		zmbufs[i]->desc_idx = avail_idx + i;
>+		zmbufs[i]->desc_idx = ids[i];
> 		zmbufs[i]->desc_count = 1;
> 	}
> 
>@@ -2045,7 +2045,7 @@ virtio_dev_tx_single_packed_zmbuf(struct virtio_net *dev,
> 		return -1;
> 	}
> 	zmbuf->mbuf = *pkts;
>-	zmbuf->desc_idx = vq->last_avail_idx;
>+	zmbuf->desc_idx = buf_id;
> 	zmbuf->desc_count = desc_count;
> 
> 	rte_mbuf_refcnt_update(*pkts, 1);
>-- 
>2.17.1
>

Apart from above,

Reviewed-by: Xiaolong Ye <xiaolong.ye at intel.com>