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[Qemu-devel] [PATCH V4 21/22] virtio-net: migration support for multique
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH V4 21/22] virtio-net: migration support for multiqueue |
Date: |
Wed, 30 Jan 2013 19:12:40 +0800 |
This patch add migration support for multiqueue virtio-net. Instead of bumping
the version, we conditionally send the info of multiqueue only when the device
support more than one queue to maintain the backward compatibility.
Signed-off-by: Jason Wang <address@hidden>
---
hw/virtio-net.c | 35 +++++++++++++++++++++++++++++------
1 files changed, 29 insertions(+), 6 deletions(-)
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 0e4063f..d57b255 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -1062,8 +1062,8 @@ static void virtio_net_set_multiqueue(VirtIONet *n, int
multiqueue, int ctrl)
static void virtio_net_save(QEMUFile *f, void *opaque)
{
+ int i;
VirtIONet *n = opaque;
- VirtIONetQueue *q = &n->vqs[0];
/* At this point, backend must be stopped, otherwise
* it might keep writing to memory. */
@@ -1071,7 +1071,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
virtio_save(&n->vdev, f);
qemu_put_buffer(f, n->mac, ETH_ALEN);
- qemu_put_be32(f, q->tx_waiting);
+ qemu_put_be32(f, n->vqs[0].tx_waiting);
qemu_put_be32(f, n->mergeable_rx_bufs);
qemu_put_be16(f, n->status);
qemu_put_byte(f, n->promisc);
@@ -1087,13 +1087,19 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
qemu_put_byte(f, n->nouni);
qemu_put_byte(f, n->nobcast);
qemu_put_byte(f, n->has_ufo);
+ if (n->max_queues > 1) {
+ qemu_put_be16(f, n->max_queues);
+ qemu_put_be16(f, n->curr_queues);
+ for (i = 1; i < n->curr_queues; i++) {
+ qemu_put_be32(f, n->vqs[i].tx_waiting);
+ }
+ }
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIONet *n = opaque;
- VirtIONetQueue *q = &n->vqs[0];
- int ret, i;
+ int ret, i, link_down;
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
return -EINVAL;
@@ -1104,7 +1110,7 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int
version_id)
}
qemu_get_buffer(f, n->mac, ETH_ALEN);
- q->tx_waiting = qemu_get_be32(f);
+ n->vqs[0].tx_waiting = qemu_get_be32(f);
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
@@ -1174,6 +1180,20 @@ static int virtio_net_load(QEMUFile *f, void *opaque,
int version_id)
}
}
+ if (n->max_queues > 1) {
+ if (n->max_queues != qemu_get_be16(f)) {
+ error_report("virtio-net: different max_queues ");
+ return -1;
+ }
+
+ n->curr_queues = qemu_get_be16(f);
+ for (i = 1; i < n->curr_queues; i++) {
+ n->vqs[i].tx_waiting = qemu_get_be32(f);
+ }
+ }
+
+ virtio_net_set_queues(n);
+
/* 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) {
@@ -1184,7 +1204,10 @@ static int virtio_net_load(QEMUFile *f, void *opaque,
int version_id)
/* nc.link_down can't be migrated, so infer link_down according
* to link status bit in n->status */
- qemu_get_queue(n->nic)->link_down = (n->status & VIRTIO_NET_S_LINK_UP) ==
0;
+ link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
+ for (i = 0; i < n->max_queues; i++) {
+ qemu_get_subqueue(n->nic, i)->link_down = link_down;
+ }
return 0;
}
--
1.7.1
- [Qemu-devel] [PATCH V4 07/22] net: introduce qemu_net_client_setup(), (continued)
- [Qemu-devel] [PATCH V4 07/22] net: introduce qemu_net_client_setup(), Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 12/22] tap: add Linux multiqueue support, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 13/22] tap: support enabling or disabling a queue, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 15/22] tap: multiqueue support, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 09/22] net: multiqueue support, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 11/22] tap: factor out common tap initialization, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 03/22] net: introduce qemu_get_queue(), Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 14/22] tap: introduce a helper to get the name of an interface, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 17/22] virtio: introduce virtio_del_queue(), Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 18/22] virtio: add a queue_index to VirtQueue, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 21/22] virtio-net: migration support for multiqueue,
Jason Wang <=
- [Qemu-devel] [PATCH V4 16/22] vhost: multiqueue support, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 19/22] virtio-net: separate virtqueue from VirtIONet, Jason Wang, 2013/01/30
- [Qemu-devel] [PATCH V4 22/22] virtio-net: compat multiqueue support, Jason Wang, 2013/01/30
- Message not available
Re: [Qemu-devel] [PATCH V4 00/22] Multiqueue virtio-net, Michael S. Tsirkin, 2013/01/31