On 3/16/2026 2:05 PM, Talluri, ChaitanyababuX wrote:
>
>
> -----Original Message-----
> From: fengchengwen <[email protected]>
> Sent: 13 March 2026 05:49
> To: Talluri, ChaitanyababuX <[email protected]>; [email protected];
> Richardson, Bruce <[email protected]>; [email protected];
> Singh, Aman Deep <[email protected]>
> Cc: Wani, Shaiq <[email protected]>; [email protected]
> Subject: Re: [PATCH v2] app/testpmd: fix DCB forwarding TC mask and queue
> guard
>
> On 3/12/2026 6:36 PM, Talluri Chaitanyababu wrote:
>> Update forwarding TC mask based on configured traffic classes to
>> properly handle both 4 TC and 8 TC modes. The bitmask calculation (1u
>> << nb_tcs) - 1 correctly creates masks for all available traffic
>> classes (0xF for 4 TCs, 0xFF for 8 TCs).
>>
>> When the mask is not updated after a TC configuration change, it stays
>> at the default 0xFF, which causes dcb_fwd_tc_update_dcb_info() to skip
>> the compress logic entirely (early return when mask ==
>> DEFAULT_DCB_FWD_TC_MASK).
>> This can lead to inconsistent queue allocations.
>
> Sorry, I cannot understand your question. Could you please provide some steps
> to reproduce the issue and the problem phenomenon?
>
> Please find the reproduction steps and problem description below.
>
> 1.bind 2 port to vfio-pci
> ./usertools/dpdk-devbind.py -b vfio-pci 0000:af:00.0 0000:af:00.1
> 2. start testpmd and reset DCB PFC
> ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 1-20 -n 4 -a 0000:af:00.0 -a
> 0000:af:00.1 --file-prefix=testpmd1 -- -i --rxq=256 --txq=256 --nb-cores=16
> --total-num-mbufs=600000
>
> testpmd> port stop all
> testpmd> port config 0 dcb vt off 8 pfc on
> testpmd> port config 1 dcb vt off 8 pfc on
> testpmd> port start all
> testpmd> port stop all
> testpmd> port config 0 dcb vt off 4 pfc on
>
> Test Log:
> root@srv13:~/test-1/dpdk# ./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
> EAL: Detected CPU lcores: 96
> EAL: Detected NUMA nodes: 2
> EAL: Detected static linkage of DPDK
> EAL: Multi-process socket /var/run/dpdk/testpmd1/mp_socket
> EAL: Selected IOVA mode 'VA'
> EAL: VFIO support initialized
> EAL: Using IOMMU type 1 (Type 1)
> ICE_INIT: ice_load_pkg_type(): Active package is: 1.3.50.0, ICE OS Default
> Package (single VLAN mode)
> ICE_INIT: ice_load_pkg_type(): Active package is: 1.3.50.0, ICE OS Default
> Package (single VLAN mode)
> Interactive-mode selected
> testpmd: create a new mbuf pool <mb_pool_0>: n=600000, size=2176, socket=0
> testpmd: preferred mempool ops selected: ring_mp_mc
> Configuring Port 0 (socket 0)
> ICE_DRIVER: ice_set_tx_function(): Using Vector AVX2 (port 0).
> ICE_DRIVER: ice_set_rx_function(): Using Offload Vector AVX2 (port 0).
> Port 0: B4:96:91:9F:5E:B0
> Configuring Port 1 (socket 0)
> ICE_DRIVER: ice_set_tx_function(): Using Vector AVX2 (port 1).
> ICE_DRIVER: ice_set_rx_function(): Using Offload Vector AVX2 (port 1).
> Port 1: 68:05:CA:A3:13:4C
> Checking link statuses...
> Done
> testpmd> port stop all
> Stopping ports...
>
> Port 0: link state change event
> Checking link statuses...
>
> Port 1: link state change event
> Done
> testpmd> port config 0 dcb vt off 8 pfc on
> In DCB mode, all forwarding ports must be configured in this mode.
> testpmd> port config 1 dcb vt off 8 pfc on
> testpmd> port start all
> Configuring Port 0 (socket 0)
> ICE_DRIVER: ice_set_tx_function(): Using Vector AVX2 (port 0).
> ICE_DRIVER: ice_set_rx_function(): Using Offload Vector AVX2 (port 0).
>
> Port 0: link state change event
> Port 0: B4:96:91:9F:5E:B0
> Configuring Port 1 (socket 0)
> ICE_DRIVER: ice_set_tx_function(): Using Vector AVX2 (port 1).
> ICE_DRIVER: ice_set_rx_function(): Using Offload Vector AVX2 (port 1).
> Port 1: 68:05:CA:A3:13:4C
> Checking link statuses...
> Done
> testpmd> port stop all
> Stopping ports...
>
> Port 0: link state change event
> Checking link statuses...
>
> Port 1: link state change event
> Done
> testpmd> port config 0 dcb vt off 4 pfc on
> Floating point exception
I just try to reproduce this on Kunpeng platform but found it seems no error:
dpdk-testpmd -a 0000:7d:00.0 -a 0000:7d:00.2 --file-prefix=feng -l 0-20 -- -i
--rxq=64 --txq=64 --nb-cores=16
PS: this netcard only has a max of 64 queues
So could you show the gdb output?
The detail output:
./dpdk-testpmd -a 0000:7d:00.0 -a 0000:7d:00.2 --file-prefix=feng -l 0-20 -- -i
--rxq=64 --txq=64 --nb-cores=16
EAL: Detected CPU lcores: 96
EAL: Detected NUMA nodes: 4
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/feng/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
EAL: DPDK is running on a NUMA system, but is compiled without NUMA support.
EAL: This will have adverse consequences for performance and usability.
EAL: Please use --legacy-mem option, or recompile with NUMA support.
EAL: Using IOMMU type 1 (Type 1)
Interactive-mode selected
testpmd: create a new mbuf pool <mb_pool_0>: n=307456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Configuring Port 0 (socket 0)
HNS3_DRIVER: 0000:7d:00.0 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 0: 00:18:2D:00:00:79
Configuring Port 1 (socket 0)
HNS3_DRIVER: 0000:7d:00.2 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 1: 00:18:2D:02:00:79
Checking link statuses...
Done
testpmd>
testpmd>
testpmd> HNS3_DRIVER: 0000:7d:00.0 hns3_update_link_status(): Link status
change to up!
Port 0: link state change event
testpmd>
testpmd> port stop all
Stopping ports...
Checking link statuses...
Done
testpmd> port config 0 dcb vt off 8 pfc on
In DCB mode, all forwarding ports must be configured in this mode.
testpmd> port config 1 dcb vt off 8 pfc on
testpmd> port start all
Configuring Port 0 (socket 0)
HNS3_DRIVER: 0000:7d:00.0 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 0: 00:18:2D:00:00:79
Configuring Port 1 (socket 0)
HNS3_DRIVER: 0000:7d:00.2 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 1: 00:18:2D:02:00:79
Checking link statuses...
Done
testpmd> port stop all
Stopping ports...
Checking link statuses...
Done
testpmd> port config 0 dcb vt off 4 pfc on
testpmd>
testpmd> start
Not all ports were started
testpmd> port start all
Configuring Port 0 (socket 0)
HNS3_DRIVER: 0000:7d:00.0 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 0: 00:18:2D:00:00:79
HNS3_DRIVER: 0000:7d:00.2 hns3_set_fiber_port_link_speed(): auto-negotiation is
not supported, use default fixed speed!
Port 1: 00:18:2D:02:00:79
Checking link statuses...
Done
testpmd> HNS3_DRIVER: 0000:7d:00.0 hns3_update_link_status(): Link status
change to up!
Port 0: link state change event
testpmd> start
io packet forwarding - ports=2 - cores=12 - streams=128 - NUMA support enabled,
MP allocation mode: native
Logical Core 1 (socket 0) forwards packets on 16 streams:
RX P=0/Q=0 (socket 0) -> TX P=1/Q=0 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=1 (socket 0) -> TX P=1/Q=1 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=2 (socket 0) -> TX P=1/Q=2 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=3 (socket 0) -> TX P=1/Q=3 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=4 (socket 0) -> TX P=1/Q=4 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=5 (socket 0) -> TX P=1/Q=5 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=6 (socket 0) -> TX P=1/Q=6 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=7 (socket 0) -> TX P=1/Q=7 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=8 (socket 0) -> TX P=1/Q=0 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=9 (socket 0) -> TX P=1/Q=1 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=10 (socket 0) -> TX P=1/Q=2 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=11 (socket 0) -> TX P=1/Q=3 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=12 (socket 0) -> TX P=1/Q=4 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=13 (socket 0) -> TX P=1/Q=5 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=14 (socket 0) -> TX P=1/Q=6 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=15 (socket 0) -> TX P=1/Q=7 (socket 0) peer=02:00:00:00:00:01
Logical Core 2 (socket 0) forwards packets on 16 streams:
RX P=0/Q=16 (socket 0) -> TX P=1/Q=8 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=17 (socket 0) -> TX P=1/Q=9 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=18 (socket 0) -> TX P=1/Q=10 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=19 (socket 0) -> TX P=1/Q=11 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=20 (socket 0) -> TX P=1/Q=12 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=21 (socket 0) -> TX P=1/Q=13 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=22 (socket 0) -> TX P=1/Q=14 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=23 (socket 0) -> TX P=1/Q=15 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=24 (socket 0) -> TX P=1/Q=8 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=25 (socket 0) -> TX P=1/Q=9 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=26 (socket 0) -> TX P=1/Q=10 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=27 (socket 0) -> TX P=1/Q=11 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=28 (socket 0) -> TX P=1/Q=12 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=29 (socket 0) -> TX P=1/Q=13 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=30 (socket 0) -> TX P=1/Q=14 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=31 (socket 0) -> TX P=1/Q=15 (socket 0) peer=02:00:00:00:00:01
Logical Core 3 (socket 0) forwards packets on 16 streams:
RX P=0/Q=32 (socket 0) -> TX P=1/Q=16 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=33 (socket 0) -> TX P=1/Q=17 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=34 (socket 0) -> TX P=1/Q=18 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=35 (socket 0) -> TX P=1/Q=19 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=36 (socket 0) -> TX P=1/Q=20 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=37 (socket 0) -> TX P=1/Q=21 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=38 (socket 0) -> TX P=1/Q=22 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=39 (socket 0) -> TX P=1/Q=23 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=40 (socket 0) -> TX P=1/Q=16 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=41 (socket 0) -> TX P=1/Q=17 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=42 (socket 0) -> TX P=1/Q=18 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=43 (socket 0) -> TX P=1/Q=19 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=44 (socket 0) -> TX P=1/Q=20 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=45 (socket 0) -> TX P=1/Q=21 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=46 (socket 0) -> TX P=1/Q=22 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=47 (socket 0) -> TX P=1/Q=23 (socket 0) peer=02:00:00:00:00:01
Logical Core 4 (socket 0) forwards packets on 16 streams:
RX P=0/Q=48 (socket 0) -> TX P=1/Q=24 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=49 (socket 0) -> TX P=1/Q=25 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=50 (socket 0) -> TX P=1/Q=26 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=51 (socket 0) -> TX P=1/Q=27 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=52 (socket 0) -> TX P=1/Q=28 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=53 (socket 0) -> TX P=1/Q=29 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=54 (socket 0) -> TX P=1/Q=30 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=55 (socket 0) -> TX P=1/Q=31 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=56 (socket 0) -> TX P=1/Q=24 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=57 (socket 0) -> TX P=1/Q=25 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=58 (socket 0) -> TX P=1/Q=26 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=59 (socket 0) -> TX P=1/Q=27 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=60 (socket 0) -> TX P=1/Q=28 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=61 (socket 0) -> TX P=1/Q=29 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=62 (socket 0) -> TX P=1/Q=30 (socket 0) peer=02:00:00:00:00:01
RX P=0/Q=63 (socket 0) -> TX P=1/Q=31 (socket 0) peer=02:00:00:00:00:01
Logical Core 5 (socket 0) forwards packets on 8 streams:
RX P=1/Q=0 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=1 (socket 0) -> TX P=0/Q=1 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=2 (socket 0) -> TX P=0/Q=2 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=3 (socket 0) -> TX P=0/Q=3 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=4 (socket 0) -> TX P=0/Q=4 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=5 (socket 0) -> TX P=0/Q=5 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=6 (socket 0) -> TX P=0/Q=6 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=7 (socket 0) -> TX P=0/Q=7 (socket 0) peer=02:00:00:00:00:00
Logical Core 6 (socket 0) forwards packets on 8 streams:
RX P=1/Q=8 (socket 0) -> TX P=0/Q=16 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=9 (socket 0) -> TX P=0/Q=17 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=10 (socket 0) -> TX P=0/Q=18 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=11 (socket 0) -> TX P=0/Q=19 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=12 (socket 0) -> TX P=0/Q=20 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=13 (socket 0) -> TX P=0/Q=21 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=14 (socket 0) -> TX P=0/Q=22 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=15 (socket 0) -> TX P=0/Q=23 (socket 0) peer=02:00:00:00:00:00
Logical Core 7 (socket 0) forwards packets on 8 streams:
RX P=1/Q=16 (socket 0) -> TX P=0/Q=32 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=17 (socket 0) -> TX P=0/Q=33 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=18 (socket 0) -> TX P=0/Q=34 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=19 (socket 0) -> TX P=0/Q=35 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=20 (socket 0) -> TX P=0/Q=36 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=21 (socket 0) -> TX P=0/Q=37 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=22 (socket 0) -> TX P=0/Q=38 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=23 (socket 0) -> TX P=0/Q=39 (socket 0) peer=02:00:00:00:00:00
Logical Core 8 (socket 0) forwards packets on 8 streams:
RX P=1/Q=24 (socket 0) -> TX P=0/Q=48 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=25 (socket 0) -> TX P=0/Q=49 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=26 (socket 0) -> TX P=0/Q=50 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=27 (socket 0) -> TX P=0/Q=51 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=28 (socket 0) -> TX P=0/Q=52 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=29 (socket 0) -> TX P=0/Q=53 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=30 (socket 0) -> TX P=0/Q=54 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=31 (socket 0) -> TX P=0/Q=55 (socket 0) peer=02:00:00:00:00:00
Logical Core 9 (socket 0) forwards packets on 8 streams:
RX P=1/Q=32 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=33 (socket 0) -> TX P=0/Q=1 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=34 (socket 0) -> TX P=0/Q=2 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=35 (socket 0) -> TX P=0/Q=3 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=36 (socket 0) -> TX P=0/Q=4 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=37 (socket 0) -> TX P=0/Q=5 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=38 (socket 0) -> TX P=0/Q=6 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=39 (socket 0) -> TX P=0/Q=7 (socket 0) peer=02:00:00:00:00:00
Logical Core 10 (socket 0) forwards packets on 8 streams:
RX P=1/Q=40 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=41 (socket 0) -> TX P=0/Q=1 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=42 (socket 0) -> TX P=0/Q=2 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=43 (socket 0) -> TX P=0/Q=3 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=44 (socket 0) -> TX P=0/Q=4 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=45 (socket 0) -> TX P=0/Q=5 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=46 (socket 0) -> TX P=0/Q=6 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=47 (socket 0) -> TX P=0/Q=7 (socket 0) peer=02:00:00:00:00:00
Logical Core 11 (socket 0) forwards packets on 8 streams:
RX P=1/Q=48 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=49 (socket 0) -> TX P=0/Q=1 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=50 (socket 0) -> TX P=0/Q=2 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=51 (socket 0) -> TX P=0/Q=3 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=52 (socket 0) -> TX P=0/Q=4 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=53 (socket 0) -> TX P=0/Q=5 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=54 (socket 0) -> TX P=0/Q=6 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=55 (socket 0) -> TX P=0/Q=7 (socket 0) peer=02:00:00:00:00:00
Logical Core 12 (socket 0) forwards packets on 8 streams:
RX P=1/Q=56 (socket 0) -> TX P=0/Q=0 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=57 (socket 0) -> TX P=0/Q=1 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=58 (socket 0) -> TX P=0/Q=2 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=59 (socket 0) -> TX P=0/Q=3 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=60 (socket 0) -> TX P=0/Q=4 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=61 (socket 0) -> TX P=0/Q=5 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=62 (socket 0) -> TX P=0/Q=6 (socket 0) peer=02:00:00:00:00:00
RX P=1/Q=63 (socket 0) -> TX P=0/Q=7 (socket 0) peer=02:00:00:00:00:00
io packet forwarding packets/burst=32
nb forwarding cores=16 - nb forwarding ports=2
port 0: RX queue number: 64 Tx queue number: 64
Rx offloads=0x80200 Tx offloads=0x10000
RX queue: 0
RX desc=1024 - RX free threshold=64
RX threshold registers: pthresh=0 hthresh=0 wthresh=0
RX Offloads=0x80200
TX queue: 0
TX desc=1024 - TX free threshold=928
TX threshold registers: pthresh=0 hthresh=0 wthresh=0
TX offloads=0x10000 - TX RS bit threshold=32
port 1: RX queue number: 64 Tx queue number: 64
Rx offloads=0x80200 Tx offloads=0x10000
RX queue: 0
RX desc=1024 - RX free threshold=64
RX threshold registers: pthresh=0 hthresh=0 wthresh=0
RX Offloads=0x80200
TX queue: 0
TX desc=1024 - TX free threshold=928
TX threshold registers: pthresh=0 hthresh=0 wthresh=0
TX offloads=0x10000 - TX RS bit threshold=32
testpmd>
>
> Expected behaviour:
>
> After reconfiguring PFC from 8 to 4 TCs, the forwarding TC mask should reflect
> the configured number of TCs (mask = 0xF).
>>
>> Additionally, the existing VMDQ pool guard in dcb_fwd_config_setup()
>> only checks RX queue counts, missing the case where the TX port has
>> zero queues for a given pool/TC combination. When nb_tx_queue is 0,
>> the expression "j % nb_tx_queue" triggers a SIGFPE (integer division by
>> zero).
>
> The dcb_fwd_check_cores_per_tc() check this case. So please provide the steps.
>
>>
>> Fix this by:
>> 1. Updating dcb_fwd_tc_mask after port DCB reconfiguration using the
>> user requested num_tcs value, so fwd_config_setup() sees the correct
>> mask.
>> 2. Extending the existing pool guard to also check TX queue counts.
>> 3. Adding a defensive break after the division by dcb_fwd_tc_cores to
>> catch integer truncation to zero.
>>
>> Fixes: 0ecbf93f5001 ("app/testpmd: add command to disable DCB")
>> Cc: [email protected]
>>
>> Signed-off-by: Talluri Chaitanyababu
>> <[email protected]>
>> Signed-off-by: Shaiq Wani <[email protected]>
>> ---
