On 21-9-2012 23:40, Stuart Henderson wrote: > $ ifconfig vr0 hwfeatures|head -2 > vr0: flags=8b43<UP,BROADCAST,RUNNING,PROMISC,ALLMULTI,SIMPLEX,MULTICAST> mtu > 1500 > hwfeatures=8017<CSUM_IPv4,CSUM_TCPv4,CSUM_UDPv4,VLAN_MTU,WOL> > > No problems noticed yet. (this is running i386). > > $ ifconfig vlan6 hwfeatures|head -2 > vlan6: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 > hwfeatures=0<> > > Is it right/expected that CSUM_* aren't propagated to the vlan ifaces?
It is correct. vr(4) does not have VLAN_HWTAGGING. The comment in the code explains it: > /* > * If the parent interface can do hardware-assisted > * VLAN encapsulation, then propagate its hardware- > * assisted checksumming flags. > * > * If the card cannot handle hardware tagging, it cannot > * possibly compute the correct checksums for tagged packets. > * > * This brings up another possibility, do cards exist which > * have all of these capabilities but cannot utilize them together? > */ > if (p->if_capabilities & IFCAP_VLAN_HWTAGGING) > ifv->ifv_if.if_capabilities = p->if_capabilities & > IFCAP_CSUM_MASK;
