Kernel GTP » History » Revision 7
Revision 6 (laforge, 04/26/2018 05:10 PM) → Revision 7/12 (osmith, 01/28/2021 10:35 AM)
h1. OsmoGGSN and Linux Kernel accelerated GTP-U {{>toc}} OsmoGGSN has support to use the Linux kernel GTP-U code to accelerate the data/user plane while still implementing the control plane (GTP-C) in userspace in OpenGGSN. For more information about the Linux kernel GTP-U code, please see [[linux-kernel-gtp-u:]] h2. Building OsmoGGSN with kernel which has GTP-U support At the time of writing (2018-04-26) of this wiki, below listed distributions have support of GTP kernels : * Debian ** Debian 9 "stretch" (kernel 4.9.0-6) ** Debian "unstable" * Ubuntu ** Ubuntu 16.04 "xenial" (kernel 4.8, 4.10, 4.13) ** Ubuntu 17.10 "artful" (kernel 4.13) * OpenSUSE ** OpenSUSE Tumbleweed (kernel "stable" 4.8, 4.12) * Fedora ** Fedora 25 (kernel 4.13 "kconfig":https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/diff/fedora/configs/kernel-4.13.16-x86_64.config?h=f25&id=c7f8c6df25a148b887515787667c75e18fa9790d) ** Fedora 26 (kernel 4.15 "kconfig":https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/diff/fedora/configs/kernel-4.15.18-x86_64.config?h=f26&id=7b0ed3e9a5d6773dddcc904c1d4e67c1307f02dd) ** Fedora 27 (kernel 4.16 "kconfig":https://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git/tree/fedora/configs/kernel-4.16.4-x86_64.config?h=f27&id=d06904e7457b50b9cfc108667b5b65777a43cc75) If you're using any other distribution, or are building your own kernels, please verify that @CONFIG_GTP@ is set to either @m@ or @y@. *If @CONFIG_GTP@ is not enabled, you cannot use kernel GTP-U!* Check if package @libc-ares-dev@ is installed and if not please add it. h3. Installing dependencies and build library @libosmocore@ You can install required dependency packages with: <pre> sudo apt install libtalloc-dev libpcsclite-dev </pre> Please follow instructions provided at [[cellular-infrastructure:Build from source]] in order to install libosmocore h3. Installing dependencies and build library @libgtpnl@ You can install dependencies with: <pre> sudo apt install libmnl-dev </pre> Then build libgtpnl like this <pre> git clone git://git.osmocom.org/libgtpnl.git cd libgtpnl autoreconf -fi ./configure make sudo make install sudo ldconfig </pre> h3. osmo-ggsn Build OsmoGGSN like this: <pre> git clone git://git.osmocom.org/osmo-ggsn.git cd osmo-ggsn ./configure --enable-gtp-linux make sudo make install sudo ldconfig </pre> Following message is shown at end of the command: @ ./configure --enable-gtp-linux@ <pre> OsmoGGSN Configuration: GTP Linux kernel support: yes </pre> This means that appropriate header files are available. h2. Using OpenGGSN with kernel which has GTP-U support In order to find out whether gtp.ko module is available we can enter following command: <pre> find /lib/modules/`uname -r` -name gtp.ko </pre> Output below shows that gtp.ko module is present: <pre> /lib/modules/4.8.0-30-generic/kernel/drivers/net/gtp.ko </pre> We are loading module gtp from kernel issuing command: <pre>sudo modprobe gtp</pre> when you enter: <pre> lsmod | grep gtp </pre> then more information about gtp and related udp tunnel can be obtained: <pre> gtp 28672 0 udp_tunnel 16384 1 gtp </pre> Some helpful tools are available in: @libgtpnl/tools@ you can get more details about gtp-tunnel, entering command from the OpenGGSN shell: <pre> sudo ./gtp-tunnel list </pre> Output will be similar to: <pre> version 1 tei 1/0 ms_addr 192.168.0.2 sgsn_addr 127.0.0.2 </pre> Note: OsmoGGSN is started by: <pre> sudo osmo-ggsn -c osmo-ggsn.cfg osmo-ggsn.conf </pre> Related output should be similar to the one shown below: <pre> FIXME </pre> You can now start to establish PDP contexts to your new osmo-ggsn instance, from [[OsmoSGSN:]], @sgsnemu@ or third-party SGSNs