diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/virtio-net.c | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/hw/virtio-net.c b/hw/virtio-net.c index f41db45b00..075f72df2d 100644 --- a/hw/virtio-net.c +++ b/hw/virtio-net.c @@ -528,17 +528,18 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_ { VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; - size_t hdr_len, offset, i; + size_t guest_hdr_len, offset, i, host_hdr_len; if (!virtio_net_can_receive(&n->nic->nc)) return -1; /* hdr_len refers to the header we supply to the guest */ - hdr_len = n->mergeable_rx_bufs ? + guest_hdr_len = n->mergeable_rx_bufs ? sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); - if (!virtio_net_has_buffers(n, size + hdr_len)) + host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; + if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len)) return 0; if (!receive_filter(n, buf, size)) @@ -553,13 +554,14 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_ total = 0; - if ((i != 0 && !n->mergeable_rx_bufs) || - virtqueue_pop(n->rx_vq, &elem) == 0) { + if (virtqueue_pop(n->rx_vq, &elem) == 0) { if (i == 0) return -1; - fprintf(stderr, "virtio-net truncating packet: " - "offset %zd, size %zd, hdr_len %zd\n", - offset, size, hdr_len); + fprintf(stderr, "virtio-net unexpected empty queue: " + "i %zd mergeable %d offset %zd, size %zd, " + "guest hdr len %zd, host hdr len %zd guest features 0x%x\n", + i, n->mergeable_rx_bufs, offset, size, + guest_hdr_len, host_hdr_len, n->vdev.guest_features); exit(1); } @@ -568,7 +570,7 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_ exit(1); } - if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { + if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) { fprintf(stderr, "virtio-net header not in first element\n"); exit(1); } @@ -580,19 +582,32 @@ static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_ mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; offset += receive_header(n, sg, elem.in_num, - buf + offset, size - offset, hdr_len); - total += hdr_len; + buf + offset, size - offset, guest_hdr_len); + total += guest_hdr_len; } /* copy in packet. ugh */ len = iov_from_buf(sg, elem.in_num, buf + offset, size - offset); total += len; + offset += len; + /* If buffers can't be merged, at this point we + * must have consumed the complete packet. + * Otherwise, drop it. */ + if (!n->mergeable_rx_bufs && offset < size) { +#if 0 + fprintf(stderr, "virtio-net truncated non-mergeable packet: " + + "i %zd mergeable %d offset %zd, size %zd, " + "guest hdr len %zd, host hdr len %zd\n", + i, n->mergeable_rx_bufs, + offset, size, guest_hdr_len, host_hdr_len); +#endif + return size; + } /* signal other side */ virtqueue_fill(n->rx_vq, &elem, total, i++); - - offset += len; } if (mhdr) |