[dpdk-dev] [dpdk-users] RSS Hash not working for XL710/X710 NICs for some RX mbuf sizes

Take Ceara dumitru.ceara at gmail.com
Mon Jul 25 12:04:20 CEST 2016
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Hi Beilei,

On Mon, Jul 25, 2016 at 5:24 AM, Xing, Beilei <beilei.xing at intel.com> wrote:
> Hi,
>
>> -----Original Message-----
>> From: Take Ceara [mailto:dumitru.ceara at gmail.com]
>> Sent: Friday, July 22, 2016 8:32 PM
>> To: Xing, Beilei <beilei.xing at intel.com>
>> Cc: Zhang, Helin <helin.zhang at intel.com>; Wu, Jingjing <jingjing.wu at intel.com>;
>> dev at dpdk.org
>> Subject: Re: [dpdk-dev] [dpdk-users] RSS Hash not working for XL710/X710 NICs
>> for some RX mbuf sizes
>>
>> I was using the test-pmd "txonly" implementation which sends fixed UDP
>> packets from 192.168.0.1:1024 -> 192.168.0.2:1024.
>>
>> I changed the test-pmd tx_only code so that it sends traffic with incremental
>> destination IP: 192.168.0.1:1024 -> [192.168.0.2,
>> 192.168.0.12]:1024
>> I also dumped the source and destination IPs in the "rxonly"
>> pkt_burst_receive function.
>> Then I see that packets are indeed sent to different queues but the
>> mbuf->hash.rss value is still 0.
>>
>> ./testpmd -c ffff1 -n 4 -w 0000:01:00.3 -w 0000:81:00.3 -- -i
>> --coremask=0xffff0 --rxq=16 --txq=16 --mbuf-size 1152 --txpkts 1024
>> --enable-rx-cksum --rss-udp
>>
>> [...]
>>
>>  - Receive queue=0xf
>>   PKT_RX_RSS_HASH
>>   src=68:05:CA:38:6D:63 - dst=02:00:00:00:00:01 - type=0x0800 -
>> length=1024 - nb_segs=1 - RSS queue=0xa - (outer) L2 type: ETHER -
>> (outer) L3 type: IPV4_EXT_UNKNOWN SIP=C0A80001 DIP=C0A80006 - (outer)
>> L4 type: UDP - Tunnel type: Unknown - RSS hash=0x0 - Inner L2 type:
>> Unknown - RSS queue=0xf - RSS queue=0x7 - (outer) L2 type: ETHER -
>> (outer) L3 type: IPV4_EXT_UNKNOWN SIP=C0A80001 DIP=C0A80007 - (outer)
>> L4 type: UDP - Tunnel type: Unknown - Inner L2 type: Unknown - Inner
>> L3 type: Unknown - Inner L4 type: Unknown
>>  - Receive queue=0x7
>>   PKT_RX_RSS_HASH
>>   src=68:05:CA:38:6D:63 - dst=02:00:00:00:00:01 - (outer) L2 type:
>> ETHER - (outer) L3 type: IPV4_EXT_UNKNOWN SIP=C0A80001 DIP=C0A80009 -
>> type=0x0800 - length=1024 - nb_segs=1 - Inner L3 type: Unknown - Inner
>> L4 type: Unknown - RSS hash=0x0 - (outer) L4 type: UDP - Tunnel type:
>> Unknown - Inner L2 type: Unknown - Inner L3 type: Unknown - RSS
>> queue=0x7 - Inner L4 type: Unknown
>>
>> [...]
>>
>> testpmd> stop
>>   ------- Forward Stats for RX Port= 0/Queue= 0 -> TX Port= 1/Queue= 0 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 1 -> TX Port= 1/Queue= 1 -------
>>   RX-packets: 59             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 2 -> TX Port= 1/Queue= 2 -------
>>   RX-packets: 48             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 3 -> TX Port= 1/Queue= 3 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 4 -> TX Port= 1/Queue= 4 -------
>>   RX-packets: 59             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 5 -> TX Port= 1/Queue= 5 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 6 -> TX Port= 1/Queue= 6 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 7 -> TX Port= 1/Queue= 7 -------
>>   RX-packets: 48             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 8 -> TX Port= 1/Queue= 8 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue= 9 -> TX Port= 1/Queue= 9 -------
>>   RX-packets: 59             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=10 -> TX Port= 1/Queue=10 -------
>>   RX-packets: 48             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=11 -> TX Port= 1/Queue=11 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=12 -> TX Port= 1/Queue=12 -------
>>   RX-packets: 59             TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=13 -> TX Port= 1/Queue=13 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=14 -> TX Port= 1/Queue=14 -------
>>   RX-packets: 0              TX-packets: 32             TX-dropped: 0
>>   ------- Forward Stats for RX Port= 0/Queue=15 -> TX Port= 1/Queue=15 -------
>>   RX-packets: 48             TX-packets: 32             TX-dropped: 0
>>   ---------------------- Forward statistics for port 0  ----------------------
>>   RX-packets: 428            RX-dropped: 84            RX-total: 512
>>   TX-packets: 0              TX-dropped: 0             TX-total: 0
>>   ----------------------------------------------------------------------------
>>
>>   ---------------------- Forward statistics for port 1  ----------------------
>>   RX-packets: 0              RX-dropped: 0             RX-total: 0
>>   TX-packets: 512            TX-dropped: 0             TX-total: 512
>>   ----------------------------------------------------------------------------
>>
>>   +++++++++++++++ Accumulated forward statistics for all
>> ports+++++++++++++++
>>   RX-packets: 428            RX-dropped: 84            RX-total: 512
>>   TX-packets: 512            TX-dropped: 0             TX-total: 512
>>
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> +++++++++++++++
>>
>> I checked all the RSS hash values for all the 10 different incoming streams and
>> they're all 0. Also, the fact that the traffic is actually distributed seems to suggest
>> that RSS itself is working but the mbuf hash field is (I guess) either not written or
>> corrupted.
>>
>
> I tried to reproduce the problem with the same steps you used on 16.04 and 16.07, but I really didn't replicate it.
> I think you can try follow ways:
> 1. apply the patch I told you last time and check if the problem still exists.

I applied the changes in the patch manually to 16.04. The RSS=0
problem still exists while the FDIR issue is fixed.

> 2. update the codebase and check if the problem still exists.

I updated the codebase to the latest version on
http://dpdk.org/git/dpdk. I still see the RSS=0 issue.

> 3. disable vector when you run testpmd, and check if the problem still exists.

I recompiled the latest dpdk code with
CONFIG_RTE_LIBRTE_I40E_INC_VECTOR=n and the RSS=0 issue is still
there.

My current command line is:
./testpmd -c ffff1 -n 4 -w 0000:01:00.3 -w 0000:81:00.3 -- -i
--coremask=0xffff0 --rxq=16 --txq=16 --mbuf-size 1152 --txpkts 1024
--rss-udp

Not sure if relevant but I'm running kernel 4.2.0-27:
$ uname -a
Linux jspg2 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22
15:32:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Is there anything else that might help you identify the cause of the problem?

Thanks,
Dumitru

>
>> >
>> >>
>> >> If I use a different mbuf-size, for example 2048, everything is fine:
>> >>
>> >> ./testpmd -c ffff1 -n 4 -w 0000:01:00.3 -w 0000:81:00.3 -- -i
>> >> --coremask=0xffff0 --rxq=16 --txq=16 --mbuf-size 2048 --txpkts 1024
>> >> -- enable-rx-cksum --rss-udp [...]
>> >> testpmd> set verbose 1
>> >> Change verbose level from 0 to 1
>> >> testpmd> set fwd rxonly
>> >> Set rxonly packet forwarding mode
>> >> testpmd> start tx_first
>> >>   rxonly packet forwarding - CRC stripping disabled - packets/burst=32
>> >>   nb forwarding cores=16 - nb forwarding ports=2
>> >>   RX queues=16 - RX desc=128 - RX free threshold=32
>> >>   RX threshold registers: pthresh=8 hthresh=8 wthresh=0
>> >>   TX queues=16 - TX desc=512 - TX free threshold=32
>> >>   TX threshold registers: pthresh=32 hthresh=0 wthresh=0
>> >>   TX RS bit threshold=32 - TXQ flags=0xf01 port 0/queue 1: received
>> >> 32 packets
>> >>   src=68:05:CA:38:6D:63 - dst=02:00:00:00:00:01 - type=0x0800 -
>> >> length=1024 - nb_segs=1 - RSS hash=0x5263c3f2 - RSS queue=0x1 -
>> >> (outer) L2 type: ETHER - (outer) L3 type: IPV4_EXT_UNKNOWN - (outer)
>> >> L4 type: UDP - Tunnel type: Unknown - Inner L2 type: Unknown - Inner
>> >> L3 type: Unknown - Inner L4 type: Unknown
>> >>  - Receive queue=0x1
>> >>   PKT_RX_RSS_HASH
>> >>
>> >
>> > Did you send the same packet as before to port 0?
>> >
>> >> Another weird thing I noticed is when I run test-pmd without
>> >> --enable-rx- cksum (which is the default mode) then the RSS flag doesn get
>> set at all.
>> >> Instead the PKT_RX_FDIR flag gets set. This happens even though
>> >> fdir_mode is set to RTE_FDIR_MODE_NONE in the device
>> >> configuration:
>> >>
>> >> ./testpmd -c ffff1 -n 4 -w 0000:01:00.3 -w 0000:81:00.3 -- -i
>> >> --coremask=0xffff0 --rxq=16 --txq=16 --mbuf-size 1152 --txpkts 1024
>> >> --rss- udp [...]
>> >> testpmd> set verbose 1
>> >> Change verbose level from 0 to 1
>> >> testpmd> set fwd rxonly
>> >> Set rxonly packet forwarding mode
>> >> testpmd> start tx_first
>> >>   rxonly packet forwarding - CRC stripping disabled - packets/burst=32
>> >>   nb forwarding cores=16 - nb forwarding ports=2
>> >>   RX queues=16 - RX desc=128 - RX free threshold=32
>> >>   RX threshold registers: pthresh=8 hthresh=8 wthresh=0
>> >>   TX queues=16 - TX desc=512 - TX free threshold=32
>> >>   TX threshold registers: pthresh=32 hthresh=0 wthresh=0
>> >>   TX RS bit threshold=32 - TXQ flags=0xf01 port 0/queue 1: received
>> >> 16 packets
>> >>   src=68:05:CA:38:6D:63 - dst=02:00:00:00:00:01 - type=0x0800 -
>> >> length=1024 - nb_segs=2 - FDIR matched hash=0xc3f2 ID=0x5263 Unknown
>> >> packet type
>> >>  - Receive queue=0x1
>> >>   PKT_RX_FDIR
>> >>   src=68:05:CA:38:6D:63 - dst=02:00:00:00:00:01 - type=0x0800 -
>> >> length=1024 - nb_segs=2 - FDIR matched hash=0xc3f2 ID=0x5263 Unknown
>> >> packet type
>> >>  - Receive queue=0x1
>> >>   PKT_RX_FDIR
>> >>
>> >
>> > For this issue, I think following patch can solve your problem, please apply this
>> patch.
>> > http://dpdk.org/dev/patchwork/patch/13593/
>> >
>>
>> I tried to apply it directly on 16.04 but it can't be applied. I see it's been applied to
>> dpdk-next-net/rel_16_07. Do you happen to have one that would work on the
>> latest stable 16.04 release?
>
> Sorry, I haven't. If there's conflict with R16.04, I think you can resolve it by going through the patch.
>
> Beilei
>
>>
>> Thanks,
>> Dumitru
>>
>> > Beilei
>> >
>> >> Please let me know if there's more debug info that might be of
>> >> interest in troubleshooting the RSS=0 issue.
>> >>
>> >> Thanks,
>> >> Dumitru
>> >>
>> >> > /Beilei
>> >> >
>> >> >> Thanks,
>> >> >> Dumitru
>> >> >>



-- 
Dumitru Ceara
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