From: Michael S. Tsirkin <mst@redhat.com>
Date: Mon, 24 Sep 2012 11:26:55 +0000 (+0200)
Subject: virtio-net: first s/g is always at start of buf
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c8d28e7e336869524d166d88f08ad476eadedccb;p=qemu.git

virtio-net: first s/g is always at start of buf

We know offset is 0, assert that.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 5128a2a8ba..59ab6746f0 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -631,6 +631,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
         }
 
         if (i == 0) {
+            assert(offset == 0);
             if (n->mergeable_rx_bufs) {
                 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
                                     sg, elem.in_num,
@@ -638,8 +639,8 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
                                     sizeof(mhdr.num_buffers));
             }
 
-            receive_header(n, sg, elem.in_num, buf + offset, size - offset);
-            offset += n->host_hdr_len;
+            receive_header(n, sg, elem.in_num, buf, size);
+            offset = n->host_hdr_len;
             total += n->guest_hdr_len;
             guest_offset = n->guest_hdr_len;
         } else {