HelenOS sources

e1000_vlan_set_tag  198 uspace/drv/nic/e1k/e1k.c static errno_t e1000_vlan_set_tag(ddf_fun_t *, uint16_t, bool, bool);
e1000_vlan_set_tag  213 uspace/drv/nic/e1k/e1k.c 	.vlan_set_tag = &e1000_vlan_set_tag,
HelenOS homepage, sources at GitHub