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PCI: hv: Use device serial number as PCI domain

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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 <haiyangz@microsoft.com>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
This commit is contained in:
Haiyang Zhang 2017-02-13 18:10:11 +00:00 committed by Bjorn Helgaas
parent 60e2e2fbaf
commit 4a9b0933bd
1 changed files with 12 additions and 0 deletions
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12
drivers/pci/host/pci-hyperv.c
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@ -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;