[DPDK/testpmd Bug 1795] [dpdk-25.11-rc0] checksum_offload/do_not_insert_checksum_on_the_transmit_packet: core dumped occurred when send packets

[DPDK/testpmd Bug 1795] [dpdk-25.11-rc0] checksum_offload/do_not_insert_checksum_on_the_transmit_packet: core dumped occurred when send packets

[bugzilla]

http://bugs.dpdk.org/show_bug.cgi?id=1795

            Bug ID: 1795
           Summary: [dpdk-25.11-rc0]
                    checksum_offload/do_not_insert_checksum_on_the_transmi
                    t_packet: core dumped occurred when send packets
           Product: DPDK
           Version: unspecified
          Hardware: x86
                OS: FreeBSD
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: testpmd
          Assignee: dev@dpdk.org
          Reporter: hailinx.xu@intel.com
  Target Milestone: ---

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 0,28 -n 4 -a 0000:4b:00.0 -a
0000:4b:00.1 -a 0000:4b:00.2 -a 0000:4b:00.3     -- -i --portmask=0x1
--enable-rx-cksum --port-topology=loop
set verbose 1
set fwd csum
csum mac-swap off 0
start

3. send packets
sendp([Ether(dst="52:00:00:00:00:01",
src="52:00:00:00:00:00")/IP(src="10.0.0.1",chksum=0x0)/UDP(chksum=0xf)/("X"*46),Ether(dst="52:00:00:00:00:01",
src="52:00:00:00:00:00")/IP(src="10.0.0.1",chksum=0x0)/TCP(chksum=0xf)/("X"*46),Ether(dst="52:00:00:00:00:01",
src="52:00:00:00:00:00")/IPv6(src="::1")/UDP(chksum=0xf)/("X"*46),Ether(dst="52:00:00:00:00:01",
src="52:00:00:00:00:00")/IPv6(src="::1")/TCP(chksum=0xf)/("X"*46)],iface="ens801f0",count=4)

Output: 
=======
Segmentation fault (core dumped)

Bad commit:
===========
commit 066f3d9cc21ccaf15be29dddc63891c43aac06f4
Author: Sunil Kumar Kori <skori@marvell.com>
Date:   Mon Aug 4 13:16:24 2025 +0530

    ethdev: remove callback checks from fast path

    rte_eth_fp_ops contains ops for fast path APIs. Each API
    validates availability of callback and then invoke it.
    These checks impact data path performance.

    Hence removing these NULL checks instead using dummy
    callbacks.

    Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
    Acked-by: Morten Brørup <mb@smartsharesystems.com>
    Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

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