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virtio-net: add tap_has_ufo flag to saved state

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If we tell the guest we support UFO and then migrate to host which
doesn't support it, we will find ourselves in grave difficulties.

Prevent this scenario by adding a flag to virtio-net's savevm format
which indicates whether the device requires host UFO support.

[v2:
  - add has_ufo uint8_t field for ease of vmstate conversion
  - use qemu_error()
]

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Mark McLoughlin 2009-10-22 17:43:50 +01:00 committed by Anthony Liguori
parent 6c9f58ba3b
commit 0ce0e8f498
1 changed files with 21 additions and 2 deletions
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23
hw/virtio-net.c
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@ -16,7 +16,7 @@
#include "qemu-timer.h"
#include "virtio-net.h"
#define VIRTIO_NET_VM_VERSION 10
#define VIRTIO_NET_VM_VERSION 11
#define MAC_TABLE_ENTRIES 64
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
@ -33,6 +33,7 @@ typedef struct VirtIONet
QEMUTimer *tx_timer;
int tx_timer_active;
uint32_t has_vnet_hdr;
uint8_t has_ufo;
struct {
VirtQueueElement elem;
ssize_t len;
@ -134,6 +135,16 @@ static int peer_has_vnet_hdr(VirtIONet *n)
return n->has_vnet_hdr;
}
static int peer_has_ufo(VirtIONet *n)
{
if (!peer_has_vnet_hdr(n))
return 0;
n->has_ufo = tap_has_ufo(n->vc->peer);
return n->has_ufo;
}
static uint32_t virtio_net_get_features(VirtIODevice *vdev)
{
VirtIONet *n = to_virtio_net(vdev);
@ -158,7 +169,7 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev)
features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
features |= (1 << VIRTIO_NET_F_GUEST_ECN);
if (tap_has_ufo(n->vc->peer)) {
if (peer_has_ufo(n)) {
features |= (1 << VIRTIO_NET_F_GUEST_UFO);
features |= (1 << VIRTIO_NET_F_HOST_UFO);
}
@ -697,6 +708,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
qemu_put_byte(f, n->nomulti);
qemu_put_byte(f, n->nouni);
qemu_put_byte(f, n->nobcast);
qemu_put_byte(f, n->has_ufo);
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
@ -771,6 +783,13 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
n->nobcast = qemu_get_byte(f);
}
if (version_id >= 11) {
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
qemu_error("virtio-net: saved image requires TUN_F_UFO support\n");
return -1;
}
}
/* Find the first multicast entry in the saved MAC filter */
for (i = 0; i < n->mac_table.in_use; i++) {
if (n->mac_table.macs[i * ETH_ALEN] & 1) {