[PATCH v2 0/5] Support TCP/IPv4, VxLAN and GRE GSO in DPDK

[Jiayu Hu <jiayu.hu@intel.com>]

Generic Segmentation Offload (GSO) is a SW technique to split large
packets into small ones. Akin to TSO, GSO enables applications to
operate on large packets, thus reducing per-packet processing overhead.

To enable more flexibility to applications, DPDK GSO is implemented
as a standalone library. Applications explicitly use the GSO library
to segment packets. This patch adds GSO support to DPDK for specific
packet types: specifically, TCP/IPv4, VxLAN, and GRE.

The first patch introduces the GSO API framework. The second patch
adds GSO support for TCP/IPv4 packets (containing an optional VLAN
tag). The third patch adds GSO support for VxLAN packets that contain
outer IPv4, and inner TCP/IPv4 headers (plus optional inner and/or 
outer VLAN tags). The fourth patch adds GSO support for GRE packets
that contain outer IPv4, and inner TCP/IPv4 headers (with optional 
outer VLAN tag). The last patch in the series enables TCP/IPv4, VxLAN,
and GRE GSO in testpmd's checksum forwarding engine.

The performance of TCP/IPv4 GSO on a 10Gbps link is demonstrated using
iperf. Setup for the test is described as follows:

a. Connect 2 x 10Gbps physical ports (P0, P1), which are in the same
   machine, together physically.
b. Launch testpmd with P0 and a vhost-user port, and use csum
   forwarding engine with "retry".
c. Select IP and TCP HW checksum calculation for P0; select TCP HW
   checksum calculation for vhost-user port.
d. Launch a VM with csum and tso offloading enabled.
e. Run iperf-client on virtio-net port in the VM to send TCP packets.
   With enabling csum and tso, the VM can send large TCP/IPv4 packets
   (mss is up to 64KB).
f. P1 is assigned to linux kernel and enabled kernel GRO. Run
   iperf-server on P1.

We conduct three iperf tests:

test-1: enable GSO for P0 in testpmd, and set max GSO segment length
	to 1518B. Run two iperf-client in the VM.
test-2: enable TSO for P0 in testpmd, and set TSO segsz to 1518B. Run
	two iperf-client in the VM.
test-3: disable GSO and TSO in testpmd. Run two iperf-client in the VM.

Throughput of the above three tests:

test-1: ~9Gbps
test-2: 9.5Gbps
test-3: 3Mbps

The experimental data of VxLAN and GRE will be shown later.

Change log
==========
v2:
- merge data segments whose data_len is less than mss into a large data
  segment in gso_do_segment().
- use mbuf->packet_type/l2_len/l3_len etc. instead of parsing the packet
  header in rte_gso_segment().
- provide IP id macros for applications to select fixed or incremental IP
  ids.
- change the defination of gso_types in struct rte_gso_ctx.
- replace rte_pktmbuf_detach() with rte_pktmbuf_free().
- refactor gso_update_pkt_headers().
- change the return value of rte_gso_segment().
- remove parameter checks in rte_gso_segment().
- use rte_net_get_ptype() in app/test-pmd/csumonly.c to fill
  mbuf->packet_type.
- add a new GSO command in testpmd to show GSO configuration for ports.
- misc: fix typo and optimize function description.

Jiayu Hu (3):
  gso: add Generic Segmentation Offload API framework
  gso: add TCP/IPv4 GSO support
  app/testpmd: enable TCP/IPv4, VxLAN and GRE GSO

Mark Kavanagh (2):
  gso: add VxLAN GSO support
  gso: add GRE GSO support

 app/test-pmd/cmdline.c                  | 178 ++++++++++++++++++++
 app/test-pmd/config.c                   |  24 +++
 app/test-pmd/csumonly.c                 |  60 ++++++-
 app/test-pmd/testpmd.c                  |  15 ++
 app/test-pmd/testpmd.h                  |  10 ++
 config/common_base                      |   5 +
 lib/Makefile                            |   2 +
 lib/librte_eal/common/include/rte_log.h |   1 +
 lib/librte_gso/Makefile                 |  52 ++++++
 lib/librte_gso/gso_common.c             | 281 ++++++++++++++++++++++++++++++++
 lib/librte_gso/gso_common.h             | 156 ++++++++++++++++++
 lib/librte_gso/gso_tcp.c                |  83 ++++++++++
 lib/librte_gso/gso_tcp.h                |  76 +++++++++
 lib/librte_gso/gso_tunnel.c             |  61 +++++++
 lib/librte_gso/gso_tunnel.h             |  75 +++++++++
 lib/librte_gso/rte_gso.c                |  99 +++++++++++
 lib/librte_gso/rte_gso.h                | 133 +++++++++++++++
 lib/librte_gso/rte_gso_version.map      |   7 +
 mk/rte.app.mk                           |   1 +
 19 files changed, 1315 insertions(+), 4 deletions(-)
 create mode 100644 lib/librte_gso/Makefile
 create mode 100644 lib/librte_gso/gso_common.c
 create mode 100644 lib/librte_gso/gso_common.h
 create mode 100644 lib/librte_gso/gso_tcp.c
 create mode 100644 lib/librte_gso/gso_tcp.h
 create mode 100644 lib/librte_gso/gso_tunnel.c
 create mode 100644 lib/librte_gso/gso_tunnel.h
 create mode 100644 lib/librte_gso/rte_gso.c
 create mode 100644 lib/librte_gso/rte_gso.h
 create mode 100644 lib/librte_gso/rte_gso_version.map

-- 
2.7.4