|SUCCESS|dpdk|388bb5d87a| intel-Functional

[sys_stv at intel.com]

Test-Label: intel-Functional
Test-Status: SUCCESS
_Functional PASS_

DPDK git repo: dpdk
commit 388bb5d87a4e88182fc625f6d23e68fe790f2f25
Author: Talluri Chaitanyababu <chaitanyababux.talluri at intel.com>
Date:   Fri Mar 20 06:29:54 2026 +0000

    app/testpmd: fix DCB forwarding TC mismatch handling
    
    Fix DCB forwarding failed when the number of TCs on ports is inconsistent.
    
    When ports have asymmetric TC configurations (e.g. 2 ports, port0 has
    4 TCs and port1 has 8 TCs), the forwarding logic iterates based only
    on the Rx port TC count.
    This can lead to accessing invalid Tx TC entries and incorrect queue
    mapping, which will result in a SIGFPE exception.
    
    Additionally, the existing VMDq pool guard in dcb_fwd_config_setup()
    only checks RX queue counts and does not consider the case where the TX
    port has no queues for a given pool/TC combination.
    
    Fix this by:
    1. Introducing an effective TC count using RTE_MIN() of Rx and Tx TC
       values, ensuring forwarding only operates on valid TCs supported by
       both ports.
    2. Updating the loop condition to use the effective TC count instead of
       only the Rx TC count.
    3. Extending the queue validation in dcb_fwd_config_setup() to ensure
       both Rx and Tx queues are valid for a given TC.
    
    Testpmd command to reproduce:
    
    x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-20 -n 4 \
    -a 0000:31:00.0 -a 0000:4b:00.0 \
    --file-prefix=testpmd1 -- -i --rxq=256 --txq=256 \
    --nb-cores=16 --total-num-mbufs=600000
    
    port stop all
    port config 0 dcb vt off 8 pfc on
    port config 1 dcb vt off 8 pfc on
    port start all
    port stop all
    port config 0 dcb vt off 4 pfc on
    
    This ensures correct queue mapping and avoids issues when switching
    between different DCB configurations across ports.
    
    Fixes: 1a572499beb6 ("app/testpmd: setup DCB forwarding based on traffic class")
    Cc: stable at dpdk.org
    
    Signed-off-by: Talluri Chaitanyababu <chaitanyababux.talluri at intel.com>
    Signed-off-by: Shaiq Wani <shaiq.wani at intel.com>
    Acked-by: Chengwen Feng <fengchengwen at huawei.com>

Smoke-Testing Summary : 31 Case Done, 31 Successful, 0 Failures      


OS : Ubuntu 24.04.3 LTS       
Kernel : 6.8.0-71-generic         
GCC : 13.3.0-6ubuntu2~24.04        
NIC : Ethernet Controller XL710 for 40GbE QSFP+         
Target : x86_64-native-linuxapp-gcc      

	Test result details:
	+-----------------+---------------------------------------------------+-------+
	| suite           | case                                              | status|
	+-----------------+---------------------------------------------------+-------+
	| checksum_offload| test_do_not_insert_checksum_on_the_transmit_packet| passed|
	| checksum_offload| test_hardware_checksum_check_ip_rx                | passed|
	| checksum_offload| test_hardware_checksum_check_ip_tx                | passed|
	| checksum_offload| test_hardware_checksum_check_l4_rx                | passed|
	| checksum_offload| test_hardware_checksum_check_l4_tx                | passed|
	| checksum_offload| test_insert_checksum_on_the_transmit_packet       | passed|
	| checksum_offload| test_rx_checksum_valid_flags                      | passed|
	| checksum_offload| test_checksum_offload_with_vlan                   | n/a   |
	| dual_vlan       | test_dual_vlan_priority_rxtx                      | passed|
	| dual_vlan       | test_vlan_filter_config                           | passed|
	| dual_vlan       | test_vlan_filter_table                            | passed|
	| dual_vlan       | test_vlan_insert_config                           | passed|
	| dual_vlan       | test_vlan_random_test                             | passed|
	| dual_vlan       | test_vlan_strip_config                            | passed|
	| dual_vlan       | test_vlan_synthetic_test                          | passed|
	| dual_vlan       | test_vlan_tpid_config                             | passed|
	| dual_vlan       | test_vlan_stripq_config                           | n/a   |
	| jumboframes     | test_jumboframes_bigger_jumbo                     | passed|
	| jumboframes     | test_jumboframes_jumbo_jumbo                      | passed|
	| jumboframes     | test_jumboframes_jumbo_nojumbo                    | passed|
	| jumboframes     | test_jumboframes_normal_jumbo                     | passed|
	| jumboframes     | test_jumboframes_normal_nojumbo                   | passed|
	| rxtx_offload    | test_rxoffload_port_all                           | passed|
	| rxtx_offload    | test_rxoffload_port_cmdline                       | passed|
	| rxtx_offload    | test_txoffload_port                               | passed|
	| rxtx_offload    | test_txoffload_port_all                           | passed|
	| rxtx_offload    | test_txoffload_port_checksum                      | passed|
	| rxtx_offload    | test_txoffload_port_cmdline                       | passed|
	| rxtx_offload    | test_txoffload_port_multi_segs                    | passed|
	| rxtx_offload    | test_txoffload_queue                              | passed|
	| rxtx_offload    | test_rxoffload_queue                              | n/a   |
	+-----------------+---------------------------------------------------+-------+


DPDK STV team