[dpdk-dev] dpdk_21.02--kni interface does not work properly

[Ferruh Yigit]

On 2/21/2021 9:45 AM, mirzaei.reza wrote:
> Hello,
> 
> I've recently migrated from dpdk-18.05 to dpdk-21.02. I built "kni"
> example according to this tutorial [1 [1]], every thing is fine except
> that
> it has no output packet (no tx). There is a same problem in dpdk-20.11.
> Have I ignored something? I would be
> grateful if anyone could help me.
> 
> It may also be helpful to mention that after I change the Interface
> state to UP, The output of `ip link` shows that the state of this
> interface still is DOWN.
> 

It can be related to the 'carrier' update for the kni interfaces [1].

Can you please check following for your interface '<iface>':
"cat /sys/class/net/<iface>/carrier"

There are a few options,
- insert 'rte_kni.ko' kernel module with "carrier=on" kernel param, to default 
enable the carrier.
"insmod ./build/kernel/linux/kni/rte_kni.ko carrier=on"

- use '-m' argument to 'dpdk-kni' sample app, to reflect actual device carrier 
status to the kni interface:
./build/examples/dpdk-kni -l0,40-44 -- -m -P -p0x3 --config "(0,40,42),(1,41,43)"


[1]
Fixes: 89397a01ce4a ("kni: set default carrier state of interface")


> outputs:
> 
>> ./BUILD/KNI -L 4-7 -N 4 -- -P -P 0X3 --CONFIG="(0,4,6),(1,5,7)"
> ------------------------------------------------------------------------------------------------------------
> 
> EAL: Detected 16 lcore(s)
> EAL: Detected 1 NUMA nodes
> EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
> EAL: Selected IOVA mode 'PA'
> EAL: No available hugepages reported in hugepages-1048576kB
> EAL: Probing VFIO support...
> EAL: VFIO support initialized
> EAL: using IOMMU type 1 (Type 1)
> EAL: Probe PCI driver: net_i40e (8086:158b) device: 0000:06:00.0 (socket
> 0)
> EAL: Probe PCI driver: net_i40e (8086:158b) device: 0000:06:00.1 (socket
> 0)
> EAL: No legacy callbacks, legacy socket not created
> APP: Initialising port 0 ...
> APP: Initialising port 1 ...
> 
> Checking link status
> ........done
> Port 0 Link up at 10 Gbps FDX Autoneg
> Port 1 Link up at 10 Gbps FDX Autoneg
> APP: ========================
> APP: KNI Running
> APP: kill -SIGUSR1 128701
> APP: Show KNI Statistics.
> APP: kill -SIGUSR2 128701
> APP: Zero KNI Statistics.
> APP: ========================
> APP: Lcore 5 is reading from port 1
> APP: Lcore 6 is writing to port 0
> APP: Lcore 7 is writing to port 1
> APP: Lcore 4 is reading from port 0
> APP: Configure network interface of 0 up
> KNI: Configure promiscuous mode of 0 to 1
> KNI: Configure promiscuous mode of 0 to 0
> 
> --------------------------------------------------------------------------------------------------------------
> 
> 
>> IFCONFIG VETH0 1.1.2.39/24 UP
> 
>> TCPDUMP -V -N -I VETH0
> ------------------------------------------------------------------------------------------------------------
> 
> 07:22:26.218095 IP (tos 0x0, ttl 64, id 15551, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 1, length 64
> 07:22:27.218093 IP (tos 0x0, ttl 64, id 15619, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 2, length 64
> 07:22:28.242082 IP (tos 0x0, ttl 64, id 15826, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 3, length 64
> 07:22:29.266097 IP (tos 0x0, ttl 64, id 15948, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 4, length 64
> 07:22:30.290083 IP (tos 0x0, ttl 64, id 16060, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 5, length 64
> 07:22:31.314073 IP (tos 0x0, ttl 64, id 16118, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 6, length 64
> 07:22:32.342079 IP (tos 0x0, ttl 64, id 16236, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 7, length 64
> 07:22:33.366074 IP (tos 0x0, ttl 64, id 16332, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 8, length 64
> 07:22:34.390079 IP (tos 0x0, ttl 64, id 16511, offset 0, flags [DF],
> proto ICMP (1), length 84)
> 1.1.2.2 > 1.1.2.39: ICMP echo request, id 229, seq 9, length 64
> 
> --------------------------------------------------------------------------------------------------------------
> 
> Best Regards
> 
> Links:
> ------
> [1]
> https://doc.dpdk.org/guides-21.02/sample_app_ug/kernel_nic_interface.html
> [1]
> 
> Links:
> ------
> [1]
> https://doc.dpdk.org/guides-20.11/sample_app_ug/kernel_nic_interface.html
>