Actually the -EOPNOTSUPP error is the default behaviour, unless your
driver implements the .ndo_get_phys_port_id() callback, and at the
moment (4.18-rc3) only 7 drivers (out of several hundreds) implement
that:
linux$ grep -ri do_get_phys_port_id drivers/net/
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c: .ndo_get_phys_port_id =
cxgb4_mgmt_get_phys_port_id,
drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c: .ndo_get_phys_port_id
= bnx2x_get_phys_port_id,
drivers/net/ethernet/mellanox/mlx4/en_netdev.c: .ndo_get_phys_port_id =
mlx4_en_get_phys_port_id,
drivers/net/ethernet/mellanox/mlx4/en_netdev.c: .ndo_get_phys_port_id =
mlx4_en_get_phys_port_id,
drivers/net/ethernet/sfc/efx.c: .ndo_get_phys_port_id = efx_get_phys_port_id,
drivers/net/ethernet/emulex/benet/be_main.c: .ndo_get_phys_port_id =
be_get_phys_port_id,
drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c: .ndo_get_phys_port_id
= qlcnic_get_phys_port_id,
drivers/net/ethernet/intel/i40e/i40e_main.c: .ndo_get_phys_port_id =
i40e_get_phys_port_id,
or you fall back to the "default behaviour" in net/core/dev.c:
/**
* dev_get_phys_port_id - Get device physical port ID
* @dev: device
* @ppid: port ID
*
* Get device physical port ID
*/
int dev_get_phys_port_id(struct net_device *dev,
struct netdev_phys_item_id *ppid)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_get_phys_port_id)
return -EOPNOTSUPP;
return ops->ndo_get_phys_port_id(dev, ppid);
}
EXPORT_SYMBOL(dev_get_phys_port_id);
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https://bugs.launchpad.net/bugs/1771662
Title:
[bionic] libvirtError: Node device not found: no node device with
matching name
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