[dpdk-dev] Unable to send ping requests using pktgen-dpdk

Safiyat Reza reza.safiyat at acm.org
Mon Apr 17 18:35:56 CEST 2017


On 17 April 2017 at 21:25, Wiles, Keith <keith.wiles at intel.com> wrote:

> Comments below:
>
> > On Apr 17, 2017, at 8:07 AM, Safiyat Reza <reza.safiyat at acm.org> wrote:
> >
> > Hi,
> >
> > I am trying to ping a remote machine (within the same network) via port 0
> > using the command
> >
> > Pktgen> ping4 0
> >
> > But the packet that is received on the remote machine is not a ping
> packet.
> > Upon investigation using dpdkcap (https://github.com/dpdkcap/dpdkcap)
> and
> > tcpdump, the packet
> >
> > dpdkcap output:
> >    reading from file output_01.pcap, link-type EN10MB (Ethernet)
> >    12:50:34.870498 IP 50.0.50.14.4660 > 50.0.50.13.22136: tcp 6
> >        0x0000:  4500 002e 1636 0000 0406 d879 3200 320e  E....6.....y2.2.
> >        0x0010:  3200 320d 1234 5678 1234 5678 1234 5690  2.2..4Vx.4Vx.4V.
> >        0x0020:  5010 2000 6c72 0000 7778 797a 3031       P...lr..wxyz01
> >
> > tcpdump output:
> >    tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size
> > 65535 bytes
> >        12:53:49.828091 IP (tos 0x0, ttl 4, id 5794, offset 0, flags
> > [none], proto TCP (6), length 46)
> >        50-0-50-14.dsl.dynamic.fusionbroadband.com.4660 >
> > 50-0-50-13.dsl.dynamic.fusionbroadband.com.22136: Flags [.], cksum
> 0x6c72
> > (correct), seq 305419896:305419902, ack 305419920, win 8192, length 6
> >
> >
> > The output after turning screen on is:
> >    - Ports 0-0 of 1   <Main Page>  Copyright (c) <2010-2016>, Intel
> > Corporation
> >      Flags:Port      :   -E----R--------:0
> >    Link State        :       <UP-10000-FD>     ----TotalRate----
> >    Pkts/s Max/Rx     :                 2/0                   2/0
> >           Max/Tx     :                 1/0                   1/0
> >    MBits/s Rx/Tx     :                 0/0                   0/0
> >    Broadcast         :                   0
> >    Multicast         :                  15
> >      64 Bytes        :                   0
> >      65-127          :                   0
> >      128-255         :                   0
> >      256-511         :                   3
> >      512-1023        :                   0
> >      1024-1518       :                   0
> >    Runts/Jumbos      :                12/0
> >    Errors Rx/Tx      :                 0/0
> >    Total Rx Pkts     :                  15
> >          Tx Pkts     :                   2
> >          Rx MBs      :                   0
> >          Tx MBs      :                   0
> >    ARP/ICMP Pkts     :                12/0
> >                  :
> >    Pattern Type      :             abcd...
> >    Tx Count/% Rate   :      Forever / 255%
> >    PktSize/Tx Burst  :           64 /   10
> >    Src/Dest Port     :         4660 /22136
> >    Pkt Type:VLAN ID  :     IPv4 / TCP:0001
> >    Dst  IP Address   :          50.0.50.13
> >    Src  IP Address   :       50.0.50.14/24
> >    Dst MAC Address   :   fa:16:3e:e3:81:68
> >    Src MAC Address   :   fa:16:3e:62:5e:3c
> >    VendID/PCI Addr   :   1af4:1000/00:04.0
> >
> >    -- Pktgen Ver: 3.1.2 (DPDK 16.07.2)  Powered by Intel® DPDK
> > -------------------
> >
> > On the sender side (using pktgen-dpdk) apart from setting the usual
> source
> > and destination ip addresses and mac addresses, I am setting
> >
> >    pktgen.icmp_echo("all", "on”);
>
> This command only enables processing incoming ICMP echo packets. This is
> the ‘E’ flags value above.
>
I understand it is to enable the replies to ping requests. Added it here
just for information, in case it affects the outgoing ping requests.

>
> >    pktgen.send_arp("all", "g”);
>
> This one only sends a single ARP packet.
>
Yes. I added this piece of information just in case it affects the outgoing
ping requests.

>
> If you are trying to send multiple ping or ICMP echo request packets then
> you need to construct a packet in the sequence page ‘page seq’. What is
> being sent is the single mode packets you see on the first page.
>
> It also looks like you have Range packets enabled, did you configure the
> range packets via ‘page range’?
>

Yes, I have configured the range feature, using a lua script. Below is the
relevant code snippet for the same.

    function setup()
        pktgen.set("all", "count", 0);
        pktgen.set("all", "pps", tonumber(pps));    -- custom change to
pktgen-dpdk source to support setting pps directly.
        pktgen.set("all", "size", tonumber(packetSize));
        pktgen.set("all", "burst", tonumber(burst));
        pktgen.set("all", "sport", 0x1234);
        pktgen.set("all", "dport", 0x5678);
        pktgen.set("all", "prime", 1);
        pktgen.set("all", "seqCnt", 0);

        pktgen.range.vlan_id("all", "start", tonumber(vlanid));
        pktgen.range.vlan_id("all", "inc", 0);
        pktgen.range.vlan_id("all", "min", 1);
        pktgen.range.vlan_id("all", "max", 4094);

        pktgen.range.pkt_size("all", "start", tonumber(packetSize));
        pktgen.range.pkt_size("all", "inc", 0);
        pktgen.range.pkt_size("all", "min", 64);
        pktgen.range.pkt_size("all", "max", 1518);

        pktgen.set_mac("all", dstmac);

        pktgen.set_ipaddr("all", "dst", dstip);
        pktgen.range.dst_ip("all", "start", dstipStart);
        pktgen.range.dst_ip("all", "inc", dstipInc);
        pktgen.range.dst_ip("all", "min", dstipMin);
        pktgen.range.dst_ip("all", "max", dstipMax);

        pktgen.range.dst_port("all", "start", dstportStart);
        pktgen.range.dst_port("all", "inc", dstportInc);
        pktgen.range.dst_port("all", "min", dstportMin);
        pktgen.range.dst_port("all", "max", dstportMax);

        pktgen.set_ipaddr("all", "src", srcip.."/24");
        pktgen.range.src_ip("all", "start", srcipStart);
        pktgen.range.src_ip("all", "inc", srcipInc);
        pktgen.range.src_ip("all", "min", srcipMin);
        pktgen.range.src_ip("all", "max", srcipMax);

        pktgen.range.src_port("all", "start", srcportStart);
        pktgen.range.src_port("all", "inc", srcportInc);
        pktgen.range.src_port("all", "min", srcportMin);
        pktgen.range.src_port("all", "max", srcportMax);

        pktgen.range.dst_mac("all", "start", dstmac);
        pktgen.range.dst_mac("all", "inc", dstmacInc);
        pktgen.range.dst_mac("all", "min", dstmac);
        pktgen.range.dst_mac("all", "max", dstmac);

        pktgen.send_arp("all", "g");
        pktgen.icmp_echo("all", "on");
        pktgen.set_range("all", "on");
    end

>From your reply, I still couldn't gather completely about how to correctly
send the ICMP echo request. I may need to send multiple requests but right
now I am trying to send one request only.

>
> >
> > via a lua script file. The burst size is 10.
> >
> > I am trying this on VMs with 'Virtio network device' as the NIC and using
> > igb_uio driver.
> >
> > I have no idea why I am unable to send ping packets. Can anyone guide me
> as
> > to what I am doing wrong, or why this issue might be coming?
> >
> > Thanks!
> >
> > Regards,
> >
> > *S*afiyat *R*eza
> > Google+ <https://plus.google.com/110916808580428369956/posts> | GitHub
> > <https://github.com/safiyat/> | LinkedIn
> > <https://in.linkedin.com/in/safiyat-reza-74329765>
>
> Regards,
> Keith
>
>


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