def get_ifname_by_pci_address(pci_addr, pf_interface=False, switchdev=False):
"""Get the interface name based on a VF's pci address
:param pci_addr: the PCI address of the VF
:param pf_interface: if True, look for the netdev of the parent PF
:param switchdev: if True, ensure that phys_switch_id is valid
:returns: netdev interface name
The returned interface name is either the parent PF or that of the VF
itself based on the argument of pf_interface.
"""
dev_path = _get_sysfs_netdev_path(pci_addr, pf_interface)
# make the if statement later more readable
ignore_switchdev = not switchdev
try:
for netdev in os.listdir(dev_path):
if ignore_switchdev or _is_switchdev(netdev):
return netdev
except Exception:
raise exception.PciDeviceNotFoundById(id=pci_addr)
raise exception.PciDeviceNotFoundById(id=pci_addr)
def get_ifname_by_pci_address(pci_addr, pf_interface=False, switchdev=False):
"""Get the interface name based on a VF's pci address
:param pci_addr: the PCI address of the VF
:param pf_interface: if True, look for the netdev of the parent PF
:param switchdev: if True, ensure that phys_switch_id is valid
:returns: netdev interface name
The returned interface name is either the parent PF or that of the VF
itself based on the argument of pf_interface.
"""
dev_path = _get_sysfs_netdev_path(pci_addr, pf_interface)
try:
devices = os.listdir(dev_path)
# Return the first netdev in case of switchdev=False
if not switchdev:
return devices[0]
elif pf_interface:
fallback_netdev = None
for netdev in devices:
# Return the uplink representor in case of switchdev=True
if _is_switchdev(netdev):
fallback_netdev = netdev if fallback_netdev is None \
else fallback_netdev
phys_port_name = _get_phys_port_name(netdev)
if phys_port_name is not None and \
UPLINK_PORT_RE.search(phys_port_name):
return netdev
# Fallback to first switchdev netdev in case of switchdev=True
if fallback_netdev is not None:
return fallback_netdev
except Exception:
raise exception.PciDeviceNotFoundById(id=pci_addr)
raise exception.PciDeviceNotFoundById(id=pci_addr)
def get_vf_num_by_pci_address(pci_addr):
"""Get the VF number based on a VF's pci address
A VF is associated with an VF number, which ip link command uses to
configure it. This number can be obtained from the PCI device filesystem.
"""
virtfns_path = "/sys/bus/pci/devices/%s/physfn/virtfn*" % (pci_addr)
vf_num = None
try:
for vf_path in glob.iglob(virtfns_path):
if re.search(pci_addr, os.readlink(vf_path)):
t = VIRTFN_RE.search(vf_path)
vf_num = t.group(1)
break
except Exception:
pass
if vf_num is None:
raise exception.PciDeviceNotFoundById(id=pci_addr)
return vf_num
def get_vf_num_by_pci_address(pci_addr):
"""Get the VF number based on a VF's pci address
A VF is associated with an VF number, which ip link command uses to
configure it. This number can be obtained from the PCI device filesystem.
"""
virtfns_path = "/sys/bus/pci/devices/%s/physfn/virtfn*" % (pci_addr)
vf_num = None
try:
#pci_addr是一个vf的pci地址
#遍历vf对应的pf下所有virtfn，如果某一个vf的路径中有指定的pci_addr，则
#通过virtfn*名称即可知道它是第几个vf
#例如：
#/sys/bus/pci/devices/0000:af:05.0/physfn/virtfn38 -> ../0000:af:05.0
for vf_path in glob.iglob(virtfns_path):
if re.search(pci_addr, os.readlink(vf_path)):
t = VIRTFN_RE.search(vf_path)
vf_num = t.group(1)
break
except Exception:
pass
if vf_num is None:
raise exception.PciDeviceNotFoundById(id=pci_addr)
return vf_num