[Qemu-devel] [PATCH v3 01/14] virtio-net: Remove old migration version support

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

virtio-net has had version 11 since 0ce0e8f4 in 2009
(v0.11.0-rc0-1480-g0ce0e8f) - remove the code to support loading
anything earlier.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
---
 hw/net/virtio-net.c | 87 +++++++++++++++++++++--------------------------------
 1 file changed, 34 insertions(+), 53 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 9999899..550db30 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1543,7 +1543,7 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
     VirtIONet *n = opaque;
     VirtIODevice *vdev = VIRTIO_DEVICE(n);
 
-    if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
+    if (version_id != VIRTIO_NET_VM_VERSION)
         return -EINVAL;
 
     return virtio_load(vdev, f, version_id);
@@ -1562,68 +1562,49 @@ static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
                                virtio_vdev_has_feature(vdev,
                                                        VIRTIO_F_VERSION_1));
 
-    if (version_id >= 3)
-        n->status = qemu_get_be16(f);
+    n->status = qemu_get_be16(f);
 
-    if (version_id >= 4) {
-        if (version_id < 8) {
-            n->promisc = qemu_get_be32(f);
-            n->allmulti = qemu_get_be32(f);
-        } else {
-            n->promisc = qemu_get_byte(f);
-            n->allmulti = qemu_get_byte(f);
-        }
-    }
+    n->promisc = qemu_get_byte(f);
+    n->allmulti = qemu_get_byte(f);
 
-    if (version_id >= 5) {
-        n->mac_table.in_use = qemu_get_be32(f);
-        /* MAC_TABLE_ENTRIES may be different from the saved image */
-        if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
-            qemu_get_buffer(f, n->mac_table.macs,
-                            n->mac_table.in_use * ETH_ALEN);
-        } else {
-            int64_t i;
-
-            /* Overflow detected - can happen if source has a larger MAC table.
-             * We simply set overflow flag so there's no need to maintain the
-             * table of addresses, discard them all.
-             * Note: 64 bit math to avoid integer overflow.
-             */
-            for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
-                qemu_get_byte(f);
-            }
-            n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
-            n->mac_table.in_use = 0;
+    n->mac_table.in_use = qemu_get_be32(f);
+    /* MAC_TABLE_ENTRIES may be different from the saved image */
+    if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
+        qemu_get_buffer(f, n->mac_table.macs,
+                        n->mac_table.in_use * ETH_ALEN);
+    } else {
+        int64_t i;
+
+        /* Overflow detected - can happen if source has a larger MAC table.
+         * We simply set overflow flag so there's no need to maintain the
+         * table of addresses, discard them all.
+         * Note: 64 bit math to avoid integer overflow.
+         */
+        for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
+            qemu_get_byte(f);
         }
+        n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
+        n->mac_table.in_use = 0;
     }
  
-    if (version_id >= 6)
-        qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
+    qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 
-    if (version_id >= 7) {
-        if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
-            error_report("virtio-net: saved image requires vnet_hdr=on");
-            return -1;
-        }
+    if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
+        error_report("virtio-net: saved image requires vnet_hdr=on");
+        return -1;
     }
 
-    if (version_id >= 9) {
-        n->mac_table.multi_overflow = qemu_get_byte(f);
-        n->mac_table.uni_overflow = qemu_get_byte(f);
-    }
+    n->mac_table.multi_overflow = qemu_get_byte(f);
+    n->mac_table.uni_overflow = qemu_get_byte(f);
 
-    if (version_id >= 10) {
-        n->alluni = qemu_get_byte(f);
-        n->nomulti = qemu_get_byte(f);
-        n->nouni = qemu_get_byte(f);
-        n->nobcast = qemu_get_byte(f);
-    }
+    n->alluni = qemu_get_byte(f);
+    n->nomulti = qemu_get_byte(f);
+    n->nouni = qemu_get_byte(f);
+    n->nobcast = qemu_get_byte(f);
 
-    if (version_id >= 11) {
-        if (qemu_get_byte(f) && !peer_has_ufo(n)) {
-            error_report("virtio-net: saved image requires TUN_F_UFO support");
-            return -1;
-        }
+    if (qemu_get_byte(f) && !peer_has_ufo(n)) {
+        error_report("virtio-net: saved image requires TUN_F_UFO support");
+        return -1;
     }
 
     if (n->max_queues > 1) {
-- 
2.7.4