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82da84282c
Recent QEMU versions added support for virtio SR-IOV emulation, allowing virtio devices to expose SR-IOV VFs to the guest. However, virtio_bus does not implement the num_vf callback of bus_type, causing dev_num_vf() to return 0 for virtio devices even when SR-IOV VFs are active. net/core/rtnetlink.c calls dev_num_vf(dev->dev.parent) to populate IFLA_NUM_VF in RTM_GETLINK responses. For a virtio-net device, dev.parent points to the virtio_device, whose busis virtio_bus. Without num_vf, SR-IOV VF information is silently omitted from tools that rely on rtnetlink, such as 'ip link show'. Add a num_vf callback that delegates to dev_num_vf(dev->parent), which in turn reaches the underlying transport (pci_bus_type for virtio-pci) where the actual VF count is tracked. Non-PCI transports are unaffected as dev_num_vf() returns 0 when no num_vf callback is present. Signed-off-by: Yui Washizu <yui.washidu@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Message-ID: <20260310061454.683894-1-yui.washidu@gmail.com>
739 lines
18 KiB
739 lines
18 KiB