diff options
Diffstat (limited to 'hw/net/virtio-net.c')
| -rw-r--r-- | hw/net/virtio-net.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index e3c2db3250..9f7e91ddce 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1142,7 +1142,8 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q) ssize_t ret, len; unsigned int out_num = elem.out_num; struct iovec *out_sg = &elem.out_sg[0]; - struct iovec sg[VIRTQUEUE_MAX_SIZE]; + struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1]; + struct virtio_net_hdr_mrg_rxbuf mhdr; if (out_num < 1) { error_report("virtio-net header not in first element"); @@ -1150,13 +1151,25 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q) } if (n->has_vnet_hdr) { - if (out_sg[0].iov_len < n->guest_hdr_len) { + if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < + n->guest_hdr_len) { error_report("virtio-net header incorrect"); exit(1); } - virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); + if (virtio_needs_swap(vdev)) { + virtio_net_hdr_swap(vdev, (void *) &mhdr); + sg2[0].iov_base = &mhdr; + sg2[0].iov_len = n->guest_hdr_len; + out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, + out_sg, out_num, + n->guest_hdr_len, -1); + if (out_num == VIRTQUEUE_MAX_SIZE) { + goto drop; + } + out_num += 1; + out_sg = sg2; + } } - /* * If host wants to see the guest header as is, we can * pass it on unchanged. Otherwise, copy just the parts @@ -1186,7 +1199,7 @@ static int32_t virtio_net_flush_tx(VirtIONetQueue *q) } len += ret; - +drop: virtqueue_push(q->tx_vq, &elem, 0); virtio_notify(vdev, q->tx_vq); |