> -----Original Message----- > From: Stephen Hemminger [mailto:stephen at networkplumber.org] > Sent: Wednesday, August 27, 2014 12:24 AM > To: Ouyang, Changchun > Cc: dev at dpdk.org > Subject: Re: [RFC 06/10] virtio: use software vlan stripping > > On Tue, 26 Aug 2014 08:37:11 +0000 > "Ouyang, Changchun" <changchun.ouyang at intel.com> wrote: > > > Hi Stephen, > > > > Would you please describe the use scenario for the front end rx vlan strip > and tx vlan insertion? > > In our current implementation, backend will strip vlan tag for RX, and > > insert > vlan tag for TX. > > > > Thanks > > Changchun > > First, we don't have to do software VLAN strip on our backend if we do this. > And this way we can always use VLAN insert on transmit. Otherwise you > have to introduce special case because there is no DPDK API to determine if > device does or does not do VLAN handling. >
How the virtio frontend tell backend whether it has software VLAN strip feature or not? It seems no feature bit to negotiate it. Thanks Changchun
