From 4a9b0933bdfcd85da840284bf5a0eb17b654b9c2 Mon Sep 17 00:00:00 2001 From: Haiyang Zhang Date: Mon, 13 Feb 2017 18:10:11 +0000 Subject: [PATCH] PCI: hv: Use device serial number as PCI domain Use the device serial number as the PCI domain. The serial numbers start with 1 and are unique within a VM. So names, such as VF NIC names, that include domain number as part of the name, can be shorter than that based on part of bus UUID previously. The new names will also stay same for VMs created with copied VHD and same number of devices. Signed-off-by: Haiyang Zhang Signed-off-by: Stephen Hemminger Signed-off-by: Bjorn Helgaas Reviewed-by: K. Y. Srinivasan --- drivers/pci/host/pci-hyperv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index cd114c6787be..ada98569b78e 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -1317,6 +1317,18 @@ static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus, get_pcichild(hpdev, hv_pcidev_ref_initial); get_pcichild(hpdev, hv_pcidev_ref_childlist); spin_lock_irqsave(&hbus->device_list_lock, flags); + + /* + * When a device is being added to the bus, we set the PCI domain + * number to be the device serial number, which is non-zero and + * unique on the same VM. The serial numbers start with 1, and + * increase by 1 for each device. So device names including this + * can have shorter names than based on the bus instance UUID. + * Only the first device serial number is used for domain, so the + * domain number will not change after the first device is added. + */ + if (list_empty(&hbus->children)) + hbus->sysdata.domain = desc->ser; list_add_tail(&hpdev->list_entry, &hbus->children); spin_unlock_irqrestore(&hbus->device_list_lock, flags); return hpdev;