[dpdk-users] testpmd and jumbo frames

Filip Janiszewski contact at filipjaniszewski.com
Tue Feb 26 14:52:30 CET 2019


Hi Rami,

The part that I forgot to clarify is that I need to test the chaining of
mbufs while sending/receiving JF, so I would like to left unchanged the
mbuf size and trigger a JF transmission by means of chaining the
segments, do you think this is possible with testpmd?

Thanks

Il 26/02/19 14:09, Rami Rosen ha scritto:
> Hi, Filip
> I believe that the --max-pkt-len=9600 has an effect of setting the
> DEV_RX_OFFLOAD_JUMBO_FRAME flag, and not setting the mbuf seg size. If
> you want to set
> the mbuf segment size, you need to use the "--mbuf-size" testpmd parameter.
> For example, add "--mbuf-size=10000" and then try "set txpkts 9036"
> from the testpmd cli
> 
> Regards,
> Rami Rosen
> 
> On Tue, 26 Feb 2019 at 08:49, Filip Janiszewski
> <contact at filipjaniszewski.com> wrote:
>>
>> Hi,
>>
>> Can someone suggest the proper configuration required to test jumbo
>> frames along with scatter mode using testpmd?
>>
>> I'm running the tool as follow:
>>
>> .
>> sudo ./testpmd -l 0-3 -n 4 -- -i --max-pkt-len=9600 --enable-scatter
>> --txd=512 --rxd=512 --forward-mode=flowgen
>> .
>>
>> then attempting to set the packet length:
>>
>> .
>> testpmd> set txpkts 9036
>> length[0]=9036 > mbuf_data_size=2176 - give up
>> .
>>
>> According to the documentation
>> (https://doc.dpdk.org/guides/testpmd_app_ug/run_app.html), the option
>> txpkts should configure:
>>
>> .
>> Set TX segment sizes or total packet length. Valid for tx-only and
>> flowgen forwarding modes.
>> .
>>
>> So I was expecting to be able to set the packet length in this way, but
>> somehow it doesn't work and when I hit start the packets have always a
>> length of 60 bytes:
>>
>> .
>>  src=00:01:02:03:04:00 - dst=00:01:02:03:04:01 - type=0x0800 - length=60
>> - nb_segs=1 - hw ptype: L2_ETHER L3_IPV4_EXT_UNKNOWN L4_UDP  - sw ptype:
>> L2_ETHER L3_IPV4 L4_UDP  - l2_len=14 - l3_len=20 - l4_len=8 - Send queue=0x0
>> .
>>
>> I've attempted to set the queue capabilities (scatter and JF) by hand with:
>>
>> .
>> testpmd> port config 1 rx_offload scatter on
>> testpmd> port config 1 rx_offload jumbo_frame on
>> .
>>
>> (repeated for both port) but this doesn't helped, so, how do I test a
>> card using testpmd with packets bigger than 2176?
>>
>> Thanks
>>
>> --
>> BR, Filip
>> +48 666 369 823

-- 
BR, Filip
+48 666 369 823


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