From: Marvin Liu <yong.liu@intel.com>
To: maxime.coquelin@redhat.com, zhihong.wang@intel.com,
xiaolong.ye@intel.com
Cc: dev@dpdk.org, stable@dpdk.org, Marvin Liu <yong.liu@intel.com>
Subject: [dpdk-dev] [PATCH] vhost: fix packed ring zero-copy
Date: Mon, 16 Mar 2020 23:38:22 +0800 [thread overview]
Message-ID: <20200316153822.113182-1-yong.liu@intel.com> (raw)
Available buffer ID should be stored in the zmbuf in the packed-ring
dequeue path. There's no guarantee that local queue avail index is
equal to buffer ID.
Fixes: d1eafb532268 ("vhost: add packed ring zcopy batch and single dequeue")
Cc: stable@dpdk.org
Signed-off-by: Marvin Liu <yong.liu@intel.com>
Reported-by: Yinan Wang <yinan.wang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.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
next reply other threads:[~2020-03-16 8:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-16 15:38 Marvin Liu [this message]
2020-03-23 5:40 ` Xiao, QimaiX
2020-04-10 14:42 ` Maxime Coquelin
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