HOWTO for the linux packet generator

yanghoo

               
               
               
               
                  HOWTO for the linux packet generator
                  ------------------------------------
Date: 041221
Enable CONFIG_NET_PKTGEN to compile and build pktgen.o either in kernel
or as module. Module is preferred. insmod pktgen if needed. Once running
pktgen creates a thread on each CPU where each thread has affinty it's CPU.
Monitoring and controlling is done via /proc. Easiest to select a suitable
a sample script and configure.
On a dual CPU:
ps aux | grep pkt
root       129  0.3  0.0     0    0 ?        SW    2003 523:20 [pktgen/0]
root       130  0.3  0.0     0    0 ?        SW    2003 509:50 [pktgen/1]
For montoring and control pktgen creates:
        /proc/net/pktgen/pgctrl
        /proc/net/pktgen/kpktgend_X
        /proc/net/pktgen/ethX
Viewing threads
===============
/proc/net/pktgen/kpktgend_0
Name: kpktgend_0  max_before_softirq: 10000
Running:
Stopped: eth1
Result: OK: max_before_softirq=10000
Most important the devices assigend to thread. Note! A device can only belong
to one thread.
Viewing devices
===============
Parm section holds configured info. Current hold running stats.
Result is printed after run or after interruption. Example:
/proc/net/pktgen/eth1      
Params: count 10000000  min_pkt_size: 60  max_pkt_size: 60
     frags: 0  delay: 0  clone_skb: 1000000  ifname: eth1
     flows: 0 flowlen: 0
     dst_min: 10.10.11.2  dst_max:
     src_min:   src_max:
     src_mac: 00:00:00:00:00:00  dst_mac: 00:04:23:AC:FD:82
     udp_src_min: 9  udp_src_max: 9  udp_dst_min: 9  udp_dst_max: 9
     src_mac_count: 0  dst_mac_count: 0
     Flags:
Current:
     pkts-sofar: 10000000  errors: 39664
     started: 1103053986245187us  stopped: 1103053999346329us idle: 880401us
     seq_num: 10000011  cur_dst_mac_offset: 0  cur_src_mac_offset: 0
     cur_saddr: 0x10a0a0a  cur_daddr: 0x20b0a0a
     cur_udp_dst: 9  cur_udp_src: 9
     flows: 0
Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags)
  763292pps 390Mb/sec (390805504bps) errors: 39664
Confguring threads and devices
==============================
This is done via the /proc interface easiest done via pgset in the scripts
Examples:
pgset "clone_skb 1"     sets the number of copies of the same packet
pgset "clone_skb 0"     use single SKB for all transmits
pgset "pkt_size 9014"   sets packet size to 9014
pgset "frags 5"         packet will consist of 5 fragments
pgset "count 200000"    sets number of packets to send, set to zero
                         for continuous sends until explicitly stopped.
pgset "delay 5000"      adds delay to hard_start_xmit(). nanoseconds
pgset "dst 10.0.0.1"    sets IP destination address
                         (BEWARE! This generator is very aggressive!)
pgset "dst_min 10.0.0.1"            Same as dst
pgset "dst_max 10.0.0.254"          Set the maximum destination IP.
pgset "src_min 10.0.0.1"            Set the minimum (or only) source IP.
pgset "src_max 10.0.0.254"          Set the maximum source IP.
pgset "dst6 fec0::1"     IPV6 destination address
pgset "src6 fec0::2"     IPV6 source address
pgset "dstmac 00:00:00:00:00:00"    sets MAC destination address
pgset "srcmac 00:00:00:00:00:00"    sets MAC source address
pgset "src_mac_count 1" Sets the number of MACs we'll range through.  
                         The 'minimum' MAC is what you set with srcmac.
pgset "dst_mac_count 1" Sets the number of MACs we'll range through.
                         The 'minimum' MAC is what you set with dstmac.
pgset "flag [name]"     Set a flag to determine behaviour.  Current flags
                         are: IPSRC_RND #IP Source is random (between min/max),
                              IPDST_RND, UDPSRC_RND,
                              UDPDST_RND, MACSRC_RND, MACDST_RND
pgset "udp_src_min 9"   set UDP source port min, If

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