vxlan/vxlan_ipv6_checksum_offload: IPV6-Vxlan TX droped by outer sw csum

https://bugs.dpdk.org/show_bug.cgi?id=1473

            Bug ID: 1473
           Summary: [dpdk-24.07] vxlan/vxlan_ipv6_checksum_offload:
                    IPV6-Vxlan TX droped by outer sw csum
           Product: DPDK
           Version: 24.07
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Environment:
DPDK version: v24.07-rc1: 4a44d97f0a52a76258c6a6cb6a713f4380a8ab1f
OS: Ubuntu 24.04 LTS/6.8.0-31-generic
Compiler: gcc version 13.2.0
Hardware platform: Intel(R) Xeon(R) Gold 6139 CPU @ 2.30GHz NIC hardware: Intel Corporation Ethernet Controller XXV710 for 25GbE SFP28 [8086:158b]
NIC firmware:
i40e: 2.25.7
FW: 9.50 0x8000f167 1.3597.0

Test Setup:
1.
usertools/dpdk-devbind.py --force --bind=vfio-pci 0000:af:00.0

2.
./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-5 -n 4 -a 0000:af:00.0 -- -i --enable-rx-cksum

set fwd csum
rx_vxlan_port add 4789 0
port stop all
csum set udp hw 0
csum set tcp hw 0
csum set sctp hw 0
csum parse-tunnel on 0
csum set outer-ip sw 0
port start all
start

3.
scapy:
sendp([Ether(src='00:00:10:00:00:00',
dst='3c:fd:fe:cf:33:74')/IPv6(src='fe80::', dst='fe80::1')/UDP(sport=63, dport=4789)/VXLAN(vni=1)/Ether(src='00:00:20:00:00:00', dst='00:00:20:00:00:01')/IP(src='192.168.2.1', dst='192.168.2.2')/UDP()/Raw(load=b'XXXXXXXXXXXXXXXXXX')],iface="ens2f0",count=1,inter=0,verbose=False)

4.stop testpmd and check the output
Show the output from the previous commands.

 ---------------------- Forward statistics for port 0  ----------------------
  RX-packets: 1              RX-dropped: 0             RX-total: 1
  Bad-ipcsum: 0              Bad-l4csum: 0             Bad-outer-l4csum: 0

Bad-outer-ipcsum: 0
TX-packets: 0 TX-dropped: 1 TX-total: 1
----------------------------------------------------------------------------
+++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++

  RX-packets: 1              RX-dropped: 0             RX-total: 1
  TX-packets: 0              TX-dropped: 1             TX-total: 1

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Expected Result:
no tx-droped

Is this issue a regression: (Y/N) Y

commit 6b5e31f7fbd71675c8f3f6d8c0f74fd1f3a0dff5

Author: David Marchand <[email protected]>
Date:   Thu Apr 18 10:20:19 2024 +0200

net/i40e: fix outer UDP checksum offload for X710

According to the X710 datasheet (and confirmed on the field..), X710 devices do not support outer checksum offload.

"""
8.4.4.2 Transmit L3 and L4 Integrity Offload

Tunneling UDP headers and GRE header are not offloaded while the X710/XXV710/XL710 leaves their checksum field as is.
If a checksum is required, software should provide it as well as the inner checksum value(s) that are required for the outer checksum. """

Fix Tx offload capabilities according to the hardware.

X722 may support such offload by setting I40E_TXD_CTX_QW0_L4T_CS_MASK.

Bugzilla ID: 1406

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https://bugs.dpdk.org/show_bug.cgi?id=1473

Huang,zhimin ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #10 from Huang,zhimin ([email protected]) --- After confirming with Intel Dev offline that this is not a bug on i40e, i will modify the test steps, thanks.

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