|SUCCESS|dpdk-next-virtio|9135c0bbc2| Intel-Testing

[sys_stv at intel.com]

Test-Label: intel-Testing
Test-Status: SUCCESS
_Testing PASS_

DPDK git repo: dpdk-next-virtio
commit 9135c0bbc2b59456b6bcd2ef611b1791a0ac761a
Author: Morten Brørup <mb at smartsharesystems.com>
Date:   Sun Oct 18 09:20:37 2026 +0000

    net/vhost: fix SW checksum when zero
    
    There is a special rule for UDP, where a checksum of zero is as 0xffff
    instead of zero.
    
    Identifying packet types requires masking with the mask, not the value,
    before comparing to the value.
    Identifying by masking with the L4 UDP packet type value (0x00000200)
    instead of the L4 packet type mask caused other L4 packet types to match;
    specifically IP fragments, IGMP packets, and certain non-fragments.
    This meant that some non-UDP packets followed the special UDP checksum
    rule, which they should not.
    
    Updated to mask the packet type with the L4 packet type mask and then
    compare to the L4 UDP packet type value, so only UDP packets follow the
    special UDP checksum rule.
    
    Furthermore, according to the mbuf documentation, Tx checksum offload
    requires that "ol_flags" is set, and only mentions "packet_type" for Rx,
    so use "ol_flags" instead of "packet_type" for checking the packet type
    at Tx.
    
    Furthermore, writing the checksum needs room for 2 bytes, not 1 byte.
    
    Note:
    Using "if (unlikely(cksum == 0) && PTYPE_MATCH)" to advise the optimizer
    about the need to evaluate PTYPE_MATCH being unlikely.
    The probability of cksum being zero is only 1/65536, so it's better to
    branch early.
    
    Fixes: 8ba1723783b2 ("net/vhost: perform SW checksum in Tx path")
    Fixes: 8f1750f42e2d ("net/vhost: perform SW checksum in Rx path")
    Cc: stable at dpdk.org
    
    Signed-off-by: Morten Brørup <mb at smartsharesystems.com>

Testing Summary : 18 Case Done, 18 Successful, 0 Failures      

TestPlan:
	pf_smoke: http://git.dpdk.org/tools/dts/tree/test_plans/pf_smoke_test_plan.rst
	vf_smoke: http://git.dpdk.org/tools/dts/tree/test_plans/vf_smoke_test_plan.rst
	virtio_smoke: http://git.dpdk.org/tools/dts/tree/test_plans/virtio_smoke_test_plan.rst

TestSuite:
	pf_smoke: http://git.dpdk.org/tools/dts/tree/tests/TestSuite_pf_smoke.py
	vf_smoke: http://git.dpdk.org/tools/dts/tree/tests/TestSuite_vf_smoke.py
	virtio_smoke: http://git.dpdk.org/tools/dts/tree/tests/TestSuite_virtio_smoke.py


OS : Ubuntu 24.04.4 LTS       
Kernel : 6.8.0-87-generic         
GCC : 13.3.0-6ubuntu2~24.04.1        
NIC : Ethernet Controller E810-C for SFP         
Target : x86_64-native-linuxapp-gcc      

	Test result details:
	+-------------+---------------------------+-------+
	| suite       | case                      | status|
	+-------------+---------------------------+-------+
	| asan_smoke  | test_rxtx_with_ASan_enable| passed|
	| pf_smoke    | test_pf_jumbo_frames      | passed|
	| pf_smoke    | test_pf_rss               | passed|
	| pf_smoke    | test_pf_tx_rx_queue       | passed|
	| vf_smoke    | test_vf_jumbo_frames      | passed|
	| vf_smoke    | test_vf_rss               | passed|
	| vf_smoke    | test_vf_tx_rx_queue       | passed|
	| virtio_smoke| test_virtio_loopback      | passed|
	| virtio_smoke| test_virtio_pvp           | passed|
	+-------------+---------------------------+-------+


OS : Ubuntu 24.04.4 LTS       
Kernel : 6.8.0-71-generic         
GCC : 13.3.0-6ubuntu2~24.04.1        
NIC : Ethernet Controller XL710 for 40GbE QSFP+         
Target : x86_64-native-linuxapp-gcc      

	Test result details:
	+-------------+---------------------------+-------+
	| suite       | case                      | status|
	+-------------+---------------------------+-------+
	| asan_smoke  | test_rxtx_with_ASan_enable| passed|
	| pf_smoke    | test_pf_jumbo_frames      | passed|
	| pf_smoke    | test_pf_rss               | passed|
	| pf_smoke    | test_pf_tx_rx_queue       | passed|
	| vf_smoke    | test_vf_rss               | passed|
	| vf_smoke    | test_vf_tx_rx_queue       | passed|
	| vf_smoke    | test_vf_jumbo_frames      | n/a   |
	| virtio_smoke| test_virtio_loopback      | passed|
	| virtio_smoke| test_virtio_pvp           | passed|
	+-------------+---------------------------+-------+


DPDK STV team