[DPDK/testpmd Bug 1797] [dpdk-25.11-rc0] rxtx_offload/txoffload_port_multi_segs: set multi segs failed

[DPDK/testpmd Bug 1797] [dpdk-25.11-rc0] rxtx_offload/txoffload_port_multi_segs: set multi segs failed

[bugzilla]

http://bugs.dpdk.org/show_bug.cgi?id=1797

            Bug ID: 1797
           Summary: [dpdk-25.11-rc0]
                    rxtx_offload/txoffload_port_multi_segs: set multi segs
                    failed
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: FreeBSD
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: testpmd
          Assignee: dev@dpdk.org
          Reporter: hailinx.xu@intel.com
  Target Milestone: ---

ENV: 
====
DPDK version: dpdk25.11.0-rc0: 1d627ea13aeec2bcccf27246e6be2508370d171e
OS: FreeBSD 14.3-RELEASE/14.3-RELEASE
Compiler: gcc version 13.3.0 (FreeBSD Ports Collection)
Hardware platform: Intel(R) Xeon(R) Gold 6348 CPU @ 2.60GHz
NIC hardware:Intel Corporation Ethernet Controller E810-C for SFP
NIC firmware: 
    Driver: ice-2.0.9
    NVM: nvm 4.90 etid 80020f02 netlist 4.4.2000-1.17.0.dfc6695b oem 1.3863.0
    DDP: ICE OS Default Package version 1.3.44.0

step:
=====
1. bind ports to DPDK
kenv hw.nic_uio.bdfs="75:0:0,75:0:1,75:0:2,75:0:3"
kldload ./x86_64-native-bsdapp-gcc/kmod/nic_uio.ko  2. exit testpmd

2. Launch testpmd x86_64-native-bsdapp-gcc/app/dpdk-testpmd -l 0,2,4,28 -n 4 -a
0000:4b:00.0 -a 0000:4b:00.1 -a 0000:4b:00.2 -a 0000:4b:00.3  -- -i
port stop all
port config 0 tx_offload multi_segs on
port config 1 tx_offload multi_segs on
port config 2 tx_offload multi_segs on
port config 3 tx_offload multi_segs on
port start all
port start 0

output
======
Configuring Port 0 (socket 0)
ETHDEV: id=0 offload clash, MULTI_SEGS vs MBUF_FAST_FREE
Fail to configure port 0

Expected Result
===============
testpmd> show port 0 tx_offload configuration
Tx Offloading Configuration of port 0 :
  Port : MULTI_SEGS
  Queue[ 0] : MULTI_SEGS

bad commit
==========
commit fdb840367cf0d6abeb17b05623679b8d1ea4c902
Author: Morten Brørup <mb@smartsharesystems.com>
Date:   Sun Aug 3 19:42:18 2025 +0000

    ethdev: reject conflicting Tx offload configurations

    When an ethdev port is configured for fast mbuf release, the driver can
    use a Tx burst function relying on the fast mbuf release preconditions.
    Thus, also configuring this port or a queue on the port for transmitting
    segmented packets is prohibited.
    Checks for these conflicting configurations have been added to the ethdev
    library, so the drivers don't have to implement them.

    Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
    Acked-by: Bruce Richardson <bruce.richardson@intel.com>
    Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
    Acked-by: Konstantin Ananyev <konstantin.ananyev@huawei.com>

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