Re: [dpdk-users] Why packet_type is zero?

[Arseniy Zaostrovnykh <arseniy.zaostrovnykh@epfl.ch>]

Is the pcap driver obsolete?

L3fwd example(http://dpdk.org/doc/guides/sample_app_ug/l3_forward.html) 
check the mbuf field packet_type, and in the zero case (which is a 
default value, as far as I know) it does nothing. At the same time, only 
few drivers even mention this field:

dpdk-2.1.0 $ grep packet_type drivers -Rl
     drivers/net/enic/enic_main.c
     drivers/net/e1000/igb_rxtx.c
     drivers/net/ixgbe/ixgbe_rxtx.c
     drivers/net/mlx4/mlx4.c
     drivers/net/i40e/i40e_rxtx.c
     drivers/net/mpipe/mpipe_tilegx.c
     drivers/net/vmxnet3/vmxnet3_rxtx.c
     drivers/net/fm10k/fm10k_rxtx.c
     drivers/net/cxgbe/sge.c

And a PCap driver (drivers/net/pcap/rte_eth_pcap.c) specifically, does 
not alter the field, so L3fwd application drops all packets.


On 06.11.2015 16:05, Arseniy Zaostrovnykh wrote:
> Forgot to mention:
> I tried KNI (first detaching eth1 and eth2 from the kernel) and pcap 
> PMD drivers, with:
>     dpdk-node $ sudo examples/l3fwd/build/app/l3fwd -c 0x01 -n 2 
> --vdev=eth_pcap0,iface=eth2 --vdev=eth_pcap1,iface=eth1 -p 0x03 
> --config="(0,0,0),(1,0,0)"
> The sysptoms are identical.
>
> On 06.11.2015 15:57, Arseniy Zaostrovnykh wrote:
>> Hello,
>>
>> I have the following setup of VirtualBox machines on a single host:
>> node2:
>>  eth0: VBox NAT, connecting to the host internet
>>  eth1: 192.168.1.12/24
>>   and additional route for 192.168.0.0/16 -> gateway 192.168.1.11
>>
>> dpdk-node:
>>  eth0: VBox NaT, connecting to the host internet
>>  eth1: 192.168.1.11/24
>>  eth2: 192.168.2.11/24
>>
>> Now I run
>>     node2 $ ping 192.168.2.13
>> so, following the route, it sends the ping ICMP messages to 
>> 192.168.1.11 (dpdk-node).
>>
>> On the dpdk-node I run l3fwd:
>>     dpdk-node $ sudo examples/l3fwd/build/app/l3fwd -c 0x01 -n 2 -- 
>> -p 0x03 --config="(0,0,0),(1,0,0)"
>> with APP_LOOKUP_METHOD = APP_LOOKUP_EXACT_MATCH, and with some 
>> debug-printfs. In particular I printf
>> m->packet_type in the beginning of the l3fwd_simple_forward function.
>>
>> Question:
>> Why does it prints 0? What is a possible causes?
>>
>> P.S. my DPDK version is 2.1.0; The printf is executed on each ping 
>> message; tcpdump shows no other traffic in this internal network.
>>
>

-- 
Respectfully,
Arseniy.