On Thu, Dec 3, 2015, at 17:35, Andreas Schultz wrote: > On 12/03/2015 04:59 PM, Hannes Frederic Sowa wrote: > > Hi Tom, > > > > On Wed, Dec 2, 2015, at 20:15, Tom Herbert wrote: > >> On Wed, Dec 2, 2015 at 8:35 AM, Hannes Frederic Sowa > >> <han...@stressinduktion.org> wrote: > >>> On Wed, Dec 2, 2015, at 04:50, Tom Herbert wrote: > >>>> That completely misses the whole point of the rest of this thread. > >>>> Protocol specific offloads are what we are trying to discourage not > >>>> encourage. Adding any more ndo functions for this purpose should be an > >>>> exception, not the norm. The bar should be naturally high considering > >>>> the cost of exposing this to ndo. > >>> > >>> Why? > >>> > >>> I wonder why we need protocol generic offloads? I know there are > >>> currently a lot of overlay encapsulation protocols. Are there many more > >>> coming? > >>> > >> Yes, and assume that there are more coming with an unbounded limit > >> (for instance I just noticed today that there is a netdev1.1 talk on > >> supporting GTP in the kernel). Besides, this problem space not just > >> limited to offload of encapsulation protocols, but how to generalize > >> offload of any transport, IPv[46], application protocols, protocol > >> implemented in user space, security protocols, etc. > > > > GTP seems to be a tunneling protocol also based on TCP, I hope the same > > standards apply to it as STT at that time (depending on the > > implementation, of course). There are some other protocols on its way, I > > see but they can just be realized as kernel modules and that's it. > > GTP is UDP based. The standard permits a variable length header (one can > add extensions after a fixed header), but that is seldom (or even never) > used. Tunnel are identified by a 32bit tunnel endpoint id for GTPv1 and > a 64bit flow id for GTPv0. UDP destination ports differ for v1 and v0, > so it's easy to distinguish.
Ok, thanks for letting me know. Browsing in Wikipedia first mentioned both TCP and UDP. But I see that v1 only uses UDP. Bye, Hannes -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
