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From: Junjie Chen <junjie.j.chen@intel.com>
To: dev@dpdk.org,
yliu@fridaylinux.org,
maxime.coquelin@redhat.com
Cc: Junjie Chen <junjie.j.chen@intel.com>
Date: Wed, 13 Dec 2017 11:50:56 -0500
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Subject: [dpdk-dev] [PATCH] vhost: fix dequeue zero copy not work with
virtio1
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This fix dequeue zero copy can not work with Qemu
version >= 2.7. Since from Qemu 2.7 virtio device
use virtio-1 protocol, the zero copy code path
forget to add offset to buffer address.
Signed-off-by: Junjie Chen <junjie.j.chen@intel.com>
---
lib/librte_vhost/virtio_net.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 6fee16e..79d80f7 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -977,7 +977,8 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
desc->addr + desc_offset, cpy_len)))) {
cur->data_len = cpy_len;
cur->data_off = 0;
- cur->buf_addr = (void *)(uintptr_t)desc_addr;
+ cur->buf_addr = (void *)(uintptr_t)(desc_addr
+ + desc_offset);
cur->buf_iova = hpa;
/*
--
2.0.1