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qemu/net: flag to control the number of vectors a nic has

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Add an option to specify the number of MSI-X vectors for PCI NIC cards. This
can also be used to disable MSI-X, for compatibility with old qemu. This
option currently only affects virtio cards.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2009-06-21 19:51:18 +03:00 • committed by Anthony Liguori
parent 566e2d3e88
commit ffe6370c9f
4 changed files with 33 additions and 8 deletions
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5
hw/virtio-net.c
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@ -745,7 +745,10 @@ VirtIODevice *virtio_net_init(DeviceState *dev)
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
n->vdev.nvectors = 3;
if (dev->nd->nvectors == NIC_NVECTORS_UNSPECIFIED)
n->vdev.nvectors = 3;
else
n->vdev.nvectors = dev->nd->nvectors;
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
virtio_net_save, virtio_net_load, n);