intiial check-in of GTP slides of netdevconf 1.1

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+Osmocom kernel-level GTP implementation
+
+When users access the Internet via cellular networks from their mobile
+devices, all this traffic is encapsulated and tunneled through a variety
+of cellular-network specific protocol layers.  Many of those protocol
+implementations run on proprietary special-purpose hardware and
+software.
+
+One protocol has been in use between certain network elements ever since
+the advent of GPRS services.  This protocol remained in use with EDGE,
+UMTS, HSPA and is even still in use in LTE:  The GPRS Tunneling Protocol
+(GTP).
+
+GTP is split in a control plane and a user plane.  The user plane at
+todays cellular internet speeds can no longer be implemented efficiently
+in userspace but requires a kernel-level implementation, much the same
+like we have kernel-level implementations for GRE, IPIP, PPP, L2TP and
+others.
+
+This presentation is about a Linux kernel level implementation of GTP-U
+that was started by Harald Welte and Pablo Neira within the Osmocom
+(Open Source Mobile Communications, http://www.osmocom.org/) project.
+
+After being abandoned for some time, recent interest (and contributions,
+particularly by Andreas Schultz) to this kernel GTP code has brought it
+back on track, and its authors aim for Linux kernel mainline inclusion.
+
+We will also cover some context in terms of where GTP is used in
+practise, and which programs are already using the kernel-level GTP
+code.
+