On Wed, Jun 28, 2023 at 04:53:51PM +0800, Ian Chen wrote: > Add the content of User Plane Function (UPF), > which was defined in 3GPP specifications since release 15. > > Signed-off-by: Ian Chen <yi.chen@xxxxxxxxxx> Hi Ian, I'm assuming this is targeted at 'net-next', as opposed to 'net', which is for fixes (I'm never sure with documentation). In any case, the target tree should be included in the subject. Subject: [PATCH net-next v2] ... If it is for net-next, then please repost when net-next reopens after July 10th. Link: https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#development-cycle > --- > Documentation/networking/gtp.rst | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/Documentation/networking/gtp.rst b/Documentation/networking/gtp.rst > index 9a7835cc1..c02aa34c4 100644 > --- a/Documentation/networking/gtp.rst > +++ b/Documentation/networking/gtp.rst > @@ -31,12 +31,12 @@ payload, such as LLC/SNDCP/RLC/MAC. > > At some network element inside the cellular operator infrastructure > (SGSN in case of GPRS/EGPRS or classic UMTS, hNodeB in case of a 3G > -femtocell, eNodeB in case of 4G/LTE), the cellular protocol stacking > +femtocell, eNodeB in case of 4G/LTE, gNobeB in case of 5G), the cellular protocol stacking > is translated into GTP *without breaking the end-to-end tunnel*. So > intermediate nodes just perform some specific relay function. I think it would be best to update the line-wrapping to keep lines less than 80 columns wide. > > -At some point the GTP packet ends up on the so-called GGSN (GSM/UMTS) > -or P-GW (LTE), which terminates the tunnel, decapsulates the packet > +At some point the GTP packet ends up on the so-called GGSN (GSM/UMTS), > +P-GW (LTE), or UPF (5G), which terminates the tunnel, decapsulates the packet > and forwards it onto an external packet data network. This can be > public internet, but can also be any private IP network (or even > theoretically some non-IP network like X.25). > @@ -60,7 +60,7 @@ payload, called GTP-U. It does not implement the 'control plane', > which is a signaling protocol used for establishment and teardown of > GTP tunnels (GTP-C). > > -So in order to have a working GGSN/P-GW setup, you will need a > +So in order to have a working GGSN/P-GW/UPF setup, you will need a > userspace program that implements the GTP-C protocol and which then > uses the netlink interface provided by the GTP-U module in the kernel > to configure the kernel module. > @@ -162,7 +162,7 @@ Local GTP-U entity and tunnel identification > GTP-U uses UDP for transporting PDU's. The receiving UDP port is 2152 > for GTPv1-U and 3386 for GTPv0-U. > > -There is only one GTP-U entity (and therefore SGSN/GGSN/S-GW/PDN-GW > +There is only one GTP-U entity (and therefore SGSN/GGSN/S-GW/PDN-GW/UPF > instance) per IP address. Tunnel Endpoint Identifier (TEID) are unique > per GTP-U entity. > > -- > 2.38.1 -- pw-bot: changes-requested
