{"id":815214,"url":"http://patchwork.ozlabs.org/api/covers/815214/?format=json","web_url":"http://patchwork.ozlabs.org/project/netdev/cover/20170919003904.5124-1-tom@quantonium.net/","project":{"id":7,"url":"http://patchwork.ozlabs.org/api/projects/7/?format=json","name":"Linux network development","link_name":"netdev","list_id":"netdev.vger.kernel.org","list_email":"netdev@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20170919003904.5124-1-tom@quantonium.net>","list_archive_url":null,"date":"2017-09-19T00:38:50","name":"[net-next,00/14] gtp: Additional feature support","submitter":{"id":72064,"url":"http://patchwork.ozlabs.org/api/people/72064/?format=json","name":"Tom Herbert","email":"tom@quantonium.net"},"mbox":"http://patchwork.ozlabs.org/project/netdev/cover/20170919003904.5124-1-tom@quantonium.net/mbox/","series":[{"id":3758,"url":"http://patchwork.ozlabs.org/api/series/3758/?format=json","web_url":"http://patchwork.ozlabs.org/project/netdev/list/?series=3758","date":"2017-09-19T00:38:50","name":"gtp: Additional feature support","version":1,"mbox":"http://patchwork.ozlabs.org/series/3758/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/815214/comments/","headers":{"Return-Path":"","X-Original-To":"patchwork-incoming@ozlabs.org","Delivered-To":"patchwork-incoming@ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; 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This follows the\ntypical UDP encapsulation model of specifying a listener port for\nreceive, and a remote address and port for transmit. \n\nGRO was straightfoward to implement following the model of other\nUDP encapsulations.\n\nProviding GSO support had one wrinkle-- the GTP header includes a\npayload length field that needs to be set per GSO segment. In order\nto address that in a general way, I create the concept of\napplication specific GSO.\n\nTo implement application layer GSO I reserved the top four bits of\nshinfo(skb)->gso_type. The idea is that an application or encapsulation\nprotocol (like GTP in this case) can register a GSO segment callback.\nThe facility returns a gso_type with upper four bits set to a value\n(index into a table). When the application sets up a packet it includes\nthe code in the gso_type for the skb. At some point (e.g. from UDP\nsegment) the gso_type is checked in the skb and if the application\nspecific GSO is indicated then the callback is called. The\nregistered callbacks include a set of other gso_types so that\nan application callback can be matched to an appropriate instance.\nFOr instance, the GTP callback checks for the UDP GSO flags.\n\nZero UDP checksum, port number configuration, and dst_cache are\nstraightforwad.\n\nConfiguration is performed by iproute2/ip. I will post that\nin a subsequent patch set.\n\nTested:\n\nConfigured the matrix of IPv4/IPv6 mobile subscriber, IPv4/IPv6 remote\npeer, and GTP version 0 and 1 (eight combinations). Observed\nconnectivity and proper GSO/GRO. Also, tested VXLAN for\nregression.\n\nTom Herbert (14):\n iptunnel: Add common functions to get a tunnel route\n vxlan: Call common functions to get tunnel routes\n gtp: Call common functions to get tunnel routes and add dst_cache\n gtp: udp recv clean up\n gtp: Remove special mtu handling\n gtp: Eliminate pktinfo and add port configuration\n gtp: Support encapsulation of IPv6 packets\n gtp: Support encpasulating over IPv6\n gtp: Allow configuring GTP interface as standalone\n gtp: Add support for devnet\n net: Add a facility to support application defined GSO\n gtp: Configuration for zero UDP checksum\n gtp: Support for GRO\n gtp: GSO support\n\n drivers/net/gtp.c | 1300 ++++++++++++++++++++++++++++++++----------\n drivers/net/vxlan.c | 84 +--\n include/linux/netdevice.h | 31 +\n include/linux/skbuff.h | 25 +\n include/net/ip6_tunnel.h | 33 ++\n include/net/ip_tunnels.h | 33 ++\n include/uapi/linux/gtp.h | 8 +\n include/uapi/linux/if_link.h | 6 +\n net/core/dev.c | 47 ++\n net/ipv4/ip_tunnel.c | 41 ++\n net/ipv4/ip_tunnel_core.c | 6 +\n net/ipv4/udp_offload.c | 20 +-\n net/ipv6/ip6_tunnel.c | 43 ++\n 13 files changed, 1306 insertions(+), 371 deletions(-)"}