On 3/18/2026 3:21 PM, Talluri, ChaitanyababuX wrote:
>
>
> -----Original Message-----
> From: fengchengwen <[email protected]>
> Sent: 17 March 2026 06:38
> 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 3/16/2026 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 port config 1 dcb vt off 8
>> testpmd> pfc on port start all port stop all port config 0 dcb vt off
>> testpmd> 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 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?
>
> As requested, please find the GDB output below.
>
> gdb --args ./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
> GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
> Copyright (C) 2024 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> Type "show copying" and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <https://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
>
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ./x86_64-native-linuxapp-gcc/app/dpdk-testpmd...
> (gdb) run
> Starting program:
> /home/intel/withoutfix/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
>
> This GDB supports auto-downloading debuginfo from the following URLs:
> <https://debuginfod.ubuntu.com>
> Enable debuginfod for this session? (y or [n]) y
> Debuginfod has been enabled.
> To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
> Downloading separate debug info for system-supplied DSO at 0x7ffff7fc3000
> Downloading separate debug info for /lib/x86_64-linux-gnu/libelf.so.1
> Downloading separate debug info for /lib/x86_64-linux-gnu/libpcap.so.0.8
> Downloading separate debug info for /lib/x86_64-linux-gnu/libmlx5.so.1
> warning: could not find '.gnu_debugaltlink' file for
> /lib/x86_64-linux-gnu/libmlx5.so.1
> Downloading separate debug info for /lib/x86_64-linux-gnu/libmlx5.so.1
> Downloading separate debug info for /lib/x86_64-linux-gnu/libibverbs.so.1
> warning: could not find '.gnu_debugaltlink' file for
> /lib/x86_64-linux-gnu/libmana.so.1
> Downloading separate debug info for /lib/x86_64-linux-gnu/libmana.so.1
> warning: could not find '.gnu_debugaltlink' file for
> /lib/x86_64-linux-gnu/libmlx4.so.1
> Downloading separate debug info for /lib/x86_64-linux-gnu/libmlx4.so.1
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Downloading separate debug info for /lib/x86_64-linux-gnu/libsystemd.so.0
> Downloading separate debug info for /lib/x86_64-linux-gnu/libcap.so.2
> warning: could not find '.gnu_debugaltlink' file for
> /lib/x86_64-linux-gnu/libcap.so.2
> Downloading separate debug info for /lib/x86_64-linux-gnu/libcap.so.2
> Downloading separate debug info for /lib/x86_64-linux-gnu/libgcrypt.so.20
> Downloading separate debug info for /lib/x86_64-linux-gnu/liblzma.so.5
> Downloading separate debug info for /lib/x86_64-linux-gnu/libgpg-error.so.0
> EAL: Detected CPU lcores: 96
> EAL: Detected NUMA nodes: 2
> EAL: Detected static linkage of DPDK
> [New Thread 0x7ffff765e400 (LWP 1886998)]
> EAL: Multi-process socket /var/run/dpdk/testpmd1/mp_socket
> [New Thread 0x7ffff6e5d400 (LWP 1886999)]
> EAL: Selected IOVA mode 'VA'
> EAL: VFIO support initialized
> [New Thread 0x7ffff565b400 (LWP 1887000)]
> [New Thread 0x7ffff4e5a400 (LWP 1887001)]
> [New Thread 0x7fffeffff400 (LWP 1887002)]
> [New Thread 0x7fffef7fe400 (LWP 1887003)]
> [New Thread 0x7fffeeffd400 (LWP 1887004)]
> [New Thread 0x7fffee7fc400 (LWP 1887005)]
> [New Thread 0x7fffedffb400 (LWP 1887006)]
> [New Thread 0x7fffed7fa400 (LWP 1887007)]
> [New Thread 0x7fffecff9400 (LWP 1887008)]
> [New Thread 0x7fffcbfff400 (LWP 1887009)]
> [New Thread 0x7fffcb7fe400 (LWP 1887010)]
> [New Thread 0x7fffcaffd400 (LWP 1887011)]
> [New Thread 0x7fffca7fc400 (LWP 1887012)]
> [New Thread 0x7fffc9ffb400 (LWP 1887013)]
> [New Thread 0x7fffc97fa400 (LWP 1887014)]
> [New Thread 0x7fffc8ff9400 (LWP 1887015)]
> [New Thread 0x7fffabfff400 (LWP 1887016)]
> [New Thread 0x7fffab7fe400 (LWP 1887017)]
> [New Thread 0x7fffaaffd400 (LWP 1887018)]
> 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)
> [New Thread 0x7fffaa7fc400 (LWP 1887025)]
> [New Thread 0x7fffa9ffb400 (LWP 1887026)]
> 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: 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>
> testpmd>
> 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: 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
>
> Thread 1 "dpdk-testpmd" received signal SIGFPE, Arithmetic exception.
> 0x0000555555795011 in dcb_fwd_config_setup () at ../app/test-pmd/config.c:5470
> 5470 fs->tx_queue = txq + j % nb_tx_queue;
Thanks
It seem the nb_tx_queues is zero.
I add log to show the value on Kunpeng platform, and it reproduce:
testpmd> port config 0 dcb vt off 4 pfc on
nb_tx_queue is zero !!!
nb_tx_queue is zero !!!
nb_tx_queue is zero !!!
nb_tx_queue is zero !!!
...
the div zero is not trigger exception on ARM platform default.
So the rootcause is clean:
1\ Port1 has 8 TC and each TC as it corresponding queus
2\ Port0 only has 4 TC, the TC[0~3]'s queues are valid, but TC[4~7] is invalid
(the nb_tx_queues is zero)
3\ The above command will make port1's TC[4~7] forward to port0's TC[4~7], but
because the port0's TC[4~7] is invalid, so it lead to exception.
BTW: I just rebase to f87fa31a9304 which don't include dcb fwd-tc/fwd-tc-cores
command, and found it still exist above div zero problem.
So this commit fix tag is wrong.
> (gdb) n
> Couldn't get registers: No such process.
> (gdb) [Thread 0x7fffaa7fc400 (LWP 1887025) exited]
> [Thread 0x7fffa9ffb400 (LWP 1887026) exited]
> [Thread 0x7fffaaffd400 (LWP 1887018) exited]
> [Thread 0x7fffab7fe400 (LWP 1887017) exited]
> [Thread 0x7fffabfff400 (LWP 1887016) exited]
> [Thread 0x7fffc8ff9400 (LWP 1887015) exited]
> [Thread 0x7fffc97fa400 (LWP 1887014) exited]
> [Thread 0x7fffc9ffb400 (LWP 1887013) exited]
> [Thread 0x7fffcaffd400 (LWP 1887011) exited]
> [Thread 0x7fffcb7fe400 (LWP 1887010) exited]
> [Thread 0x7fffcbfff400 (LWP 1887009) exited]
> [Thread 0x7fffecff9400 (LWP 1887008) exited]
> [Thread 0x7fffed7fa400 (LWP 1887007) exited]
> [Thread 0x7fffedffb400 (LWP 1887006) exited]
> [Thread 0x7fffee7fc400 (LWP 1887005) exited]
> [Thread 0x7fffeeffd400 (LWP 1887004) exited]
> [Thread 0x7fffef7fe400 (LWP 1887003) exited]
> [Thread 0x7fffeffff400 (LWP 1887002) exited]
> [Thread 0x7ffff4e5a400 (LWP 1887001) exited]
> [Thread 0x7ffff565b400 (LWP 1887000) exited]
> [Thread 0x7ffff6e5d400 (LWP 1886999) exited]
> [Thread 0x7ffff765e400 (LWP 1886998) exited]
> [Thread 0x7ffff7c1ac00 (LWP 1886964) exited]
> [Thread 0x7fffca7fc400 (LWP 1887012) exited]
> [New process 1886964]
>
> Program terminated with signal SIGFPE, Arithmetic exception.
> The program no longer exists.
>
> 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 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]>
>>> ---
>
