[dpdk-dev] [PATCH v5 0/2] gro: add UDP GRO and VXLAN UDP GRO support

[yang_y_yi at 163.com]

From: Yi Yang <yangyi01 at inspur.com>

In case that UFO or GSO is enabled, GRO is very necessary,
especially for UDP, it is more so. Many NICs can't support
VXLAN UDP UFO/USO and VLAN UFO/USO, so UDP performance
improvement depends on GSO and GRO to a great extent.

This patch series added VLAN UDP GRO and VXLAN UDP GRO
support.

I have tested it in OVS DPDK, test scenario is as below:

+-------------------------+   +--------------------------+
|VM1 --- OVS DPDK --- NIC1|---| NIC2 --- OVS-DPDK --- VM2|
+-------------------------+   +--------------------------+
         SERVER1                       SERVER2

If no GSO and GRO, 8k UDP packet can't work in case of UFO or
in case that underlay MTU is 1500, so UDP size must meet MTU
limitation, my VM MTU is 1450 (consider vxlan header), UDP
performance is about 3Gbps, with GSO and GRO enabled, I can
send 8K UDP packet, UDP performance is about 6Gbps (Note: with
small UDP packet loss rate).

FYI: OVS DPDK patch series
https://patchwork.ozlabs.org/project/openvswitch/list/?series=194621

Changelog
---------
v4 -> v5: remove duplicate line
          fix header length check issue
          add unlikely for some low probability condition branch
          rename udp_check_neighbor to udp4_check_neighbor
          remove brace for single line else statement
          remove outer_l2_len and pkt->outer_l3_len because they
            are nonsense for non-VXLAN UDP packet

v3 -> v4: split two patches in cleaner way
          remove ip_id which is unnecessary for UDP GRO
          correct hdr_len calculation

v2 -> v3: remove UDP header length check

v1 -> v2: split into two patches

Yi Yang (2):
  gro: add UDP GRO support
  gro: add VXLAN UDP GRO support

 lib/librte_gro/gro_udp4.c       | 430 +++++++++++++++++++++++++++++++
 lib/librte_gro/gro_udp4.h       | 282 +++++++++++++++++++++
 lib/librte_gro/gro_vxlan_udp4.c | 548 ++++++++++++++++++++++++++++++++++++++++
 lib/librte_gro/gro_vxlan_udp4.h | 152 +++++++++++
 lib/librte_gro/meson.build      |   2 +-
 lib/librte_gro/rte_gro.c        | 192 +++++++++++---
 lib/librte_gro/rte_gro.h        |   8 +-
 7 files changed, 1580 insertions(+), 34 deletions(-)
 create mode 100644 lib/librte_gro/gro_udp4.c
 create mode 100644 lib/librte_gro/gro_udp4.h
 create mode 100644 lib/librte_gro/gro_vxlan_udp4.c
 create mode 100644 lib/librte_gro/gro_vxlan_udp4.h

-- 
1.8.3.1