Configure the queues to follow the guest endianness, and make sure
the configuration space is doing the same.
Extra care is taken for the handling of the virtio_net_hdr structures
on both the TX and RX ends.
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
tools/kvm/virtio/net.c | 45 ++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 40 insertions(+), 5 deletions(-)
diff --git a/tools/kvm/virtio/net.c b/tools/kvm/virtio/net.c
index dbb4431..363ec73 100644
--- a/tools/kvm/virtio/net.c
+++ b/tools/kvm/virtio/net.c
@@ -73,6 +73,24 @@ static bool has_virtio_feature(struct net_dev *ndev, u32
feature)
return ndev->features & (1 << feature);
}
+static void virtio_net_fix_tx_hdr(struct virtio_net_hdr *hdr, struct net_dev
*ndev)
+{
+ hdr->hdr_len = virtio_guest_to_host_u16(&ndev->vdev,
hdr->hdr_len);
+ hdr->gso_size = virtio_guest_to_host_u16(&ndev->vdev,
hdr->gso_size);
+ hdr->csum_start = virtio_guest_to_host_u16(&ndev->vdev,
hdr->csum_start);
+ hdr->csum_offset = virtio_guest_to_host_u16(&ndev->vdev,
hdr->csum_offset);
+}
+
+static void virtio_net_fix_rx_hdr(struct virtio_net_hdr_mrg_rxbuf *hdr, struct
net_dev *ndev)
+{
+ hdr->hdr.hdr_len = virtio_host_to_guest_u16(&ndev->vdev,
hdr->hdr.hdr_len);
+ hdr->hdr.gso_size = virtio_host_to_guest_u16(&ndev->vdev,
hdr->hdr.gso_size);
+ hdr->hdr.csum_start = virtio_host_to_guest_u16(&ndev->vdev,
hdr->hdr.csum_start);
+ hdr->hdr.csum_offset = virtio_host_to_guest_u16(&ndev->vdev,
hdr->hdr.csum_offset);
+ if (has_virtio_feature(ndev, VIRTIO_NET_F_MRG_RXBUF))
+ hdr->num_buffers = virtio_host_to_guest_u16(&ndev->vdev,
hdr->num_buffers);
+}
+
static void *virtio_net_rx_thread(void *p)
{
struct iovec iov[VIRTIO_NET_QUEUE_SIZE];
@@ -106,6 +124,7 @@ static void *virtio_net_rx_thread(void *p)
.iov_len = sizeof(buffer),
};
struct virtio_net_hdr_mrg_rxbuf *hdr;
+ int i;
len = ndev->ops->rx(&dummy_iov, 1, ndev);
if (len < 0) {
@@ -114,16 +133,20 @@ static void *virtio_net_rx_thread(void *p)
goto out_err;
}
- copied = 0;
+ copied = i = 0;
head = virt_queue__get_iov(vq, iov, &out, &in, kvm);
- hdr = (void *)iov[0].iov_base;
+ hdr = iov[0].iov_base;
while (copied < len) {
size_t iovsize = min_t(size_t, len - copied,
iov_size(iov, in));
memcpy_toiovec(iov, buffer + copied, iovsize);
copied += iovsize;
- if (has_virtio_feature(ndev,
VIRTIO_NET_F_MRG_RXBUF))
- hdr->num_buffers++;
+ if (i++ == 0)
+ virtio_net_fix_rx_hdr(hdr, ndev);
+ if (has_virtio_feature(ndev,
VIRTIO_NET_F_MRG_RXBUF)) {
+ u16 num_buffers =
virtio_guest_to_host_u16(vq, hdr->num_buffers);
+ hdr->num_buffers =
virtio_host_to_guest_u16(vq, num_buffers + 1);
+ }
virt_queue__set_used_elem(vq, head, iovsize);
if (copied == len)
break;
@@ -170,11 +193,14 @@ static void *virtio_net_tx_thread(void *p)
mutex_unlock(&ndev->io_lock[id]);
while (virt_queue__available(vq)) {
+ struct virtio_net_hdr *hdr;
head = virt_queue__get_iov(vq, iov, &out, &in, kvm);
+ hdr = iov[0].iov_base;
+ virtio_net_fix_tx_hdr(hdr, ndev);
len = ndev->ops->tx(iov, out, ndev);
if (len < 0) {
pr_warning("%s: tx on vq %u failed (%d)\n",
- __func__, id, len);
+ __func__, id, errno);
goto out_err;
}
@@ -415,9 +441,14 @@ static int virtio_net__vhost_set_features(struct net_dev
*ndev)
static void set_guest_features(struct kvm *kvm, void *dev, u32 features)
{
struct net_dev *ndev = dev;
+ struct virtio_net_config *conf = &ndev->config;
ndev->features = features;
+ conf->status = virtio_host_to_guest_u16(&ndev->vdev, conf->status);
+ conf->max_virtqueue_pairs = virtio_host_to_guest_u16(&ndev->vdev,
+
conf->max_virtqueue_pairs);
+
if (ndev->mode == NET_MODE_TAP) {
if (!virtio_net__tap_init(ndev))
die_perror("You have requested a TAP device, but
creation of one has failed because");
@@ -454,6 +485,7 @@ static int init_vq(struct kvm *kvm, void *dev, u32 vq, u32
page_size, u32 align,
p = virtio_get_vq(kvm, queue->pfn, page_size);
vring_init(&queue->vring, VIRTIO_NET_QUEUE_SIZE, p, align);
+ virtio_init_device_vq(&ndev->vdev, queue);
mutex_init(&ndev->io_lock[vq]);
pthread_cond_init(&ndev->io_cond[vq], NULL);
@@ -470,6 +502,9 @@ static int init_vq(struct kvm *kvm, void *dev, u32 vq, u32
page_size, u32 align,
return 0;
}
+ if (queue->endian != VIRTIO_ENDIAN_HOST)
+ die_perror("VHOST requires VIRTIO_ENDIAN_HOST");
+
state.num = queue->vring.num;
r = ioctl(ndev->vhost_fd, VHOST_SET_VRING_NUM, &state);
if (r < 0)
--
1.8.3.4
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