Documentation/networking/pktgen.txt

   1
   2
   3                   HOWTO for the linux packet generator
   4                   ------------------------------------
   5
   6 Date: 041221
   7
   8 Enable CONFIG_NET_PKTGEN to compile and build pktgen.o either in kernel
   9 or as module. Module is preferred. insmod pktgen if needed. Once running
  10 pktgen creates a thread on each CPU where each thread has affinty it's CPU.
  11 Monitoring and controlling is done via /proc. Easiest to select a suitable
  12 a sample script and configure.
  13
  14 On a dual CPU:
  15
  16 ps aux | grep pkt
  17 root       129  0.3  0.0     0    0 ?        SW    2003 523:20 [pktgen/0]
  18 root       130  0.3  0.0     0    0 ?        SW    2003 509:50 [pktgen/1]
  19
  20
  21 For montoring and control pktgen creates:
  22         /proc/net/pktgen/pgctrl
  23         /proc/net/pktgen/kpktgend_X
  24         /proc/net/pktgen/ethX
  25
  26
  27 Viewing threads
  28 ===============
  29 /proc/net/pktgen/kpktgend_0
  30 Name: kpktgend_0  max_before_softirq: 10000
  31 Running:
  32 Stopped: eth1
  33 Result: OK: max_before_softirq=10000
  34
  35 Most important the devices assigend to thread. Note! A device can only belong
  36 to one thread.
  37
  38
  39 Viewing devices
  40 ===============
  41
  42 Parm section holds configured info. Current hold running stats.
  43 Result is printed after run or after interruption. Example:
  44
  45 /proc/net/pktgen/eth1
  46
  47 Params: count 10000000  min_pkt_size: 60  max_pkt_size: 60
  48      frags: 0  delay: 0  clone_skb: 1000000  ifname: eth1
  49      flows: 0 flowlen: 0
  50      dst_min: 10.10.11.2  dst_max:
  51      src_min:   src_max:
  52      src_mac: 00:00:00:00:00:00  dst_mac: 00:04:23:AC:FD:82
  53      udp_src_min: 9  udp_src_max: 9  udp_dst_min: 9  udp_dst_max: 9
  54      src_mac_count: 0  dst_mac_count: 0
  55      Flags:
  56 Current:
  57      pkts-sofar: 10000000  errors: 39664
  58      started: 1103053986245187us  stopped: 1103053999346329us idle: 880401us
  59      seq_num: 10000011  cur_dst_mac_offset: 0  cur_src_mac_offset: 0
  60      cur_saddr: 0x10a0a0a  cur_daddr: 0x20b0a0a
  61      cur_udp_dst: 9  cur_udp_src: 9
  62      flows: 0
  63 Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags)
  64   763292pps 390Mb/sec (390805504bps) errors: 39664
  65
  66 Confguring threads and devices
  67 ==============================
  68 This is done via the /proc interface easiest done via pgset in the scripts
  69
  70 Examples:
  71
  72  pgset "clone_skb 1"     sets the number of copies of the same packet
  73  pgset "clone_skb 0"     use single SKB for all transmits
  74  pgset "pkt_size 9014"   sets packet size to 9014
  75  pgset "frags 5"         packet will consist of 5 fragments
  76  pgset "count 200000"    sets number of packets to send, set to zero
  77                          for continuous sends until explicitly stopped.
  78
  79  pgset "delay 5000"      adds delay to hard_start_xmit(). nanoseconds
  80
  81  pgset "dst 10.0.0.1"    sets IP destination address
  82                          (BEWARE! This generator is very aggressive!)
  83
  84  pgset "dst_min 10.0.0.1"            Same as dst
  85  pgset "dst_max 10.0.0.254"          Set the maximum destination IP.
  86  pgset "src_min 10.0.0.1"            Set the minimum (or only) source IP.
  87  pgset "src_max 10.0.0.254"          Set the maximum source IP.
  88  pgset "dst6 fec0::1"     IPV6 destination address
  89  pgset "src6 fec0::2"     IPV6 source address
  90  pgset "dstmac 00:00:00:00:00:00"    sets MAC destination address
  91  pgset "srcmac 00:00:00:00:00:00"    sets MAC source address
  92
  93  pgset "src_mac_count 1" Sets the number of MACs we'll range through.
  94                          The 'minimum' MAC is what you set with srcmac.
  95
  96  pgset "dst_mac_count 1" Sets the number of MACs we'll range through.
  97                          The 'minimum' MAC is what you set with dstmac.
  98
  99  pgset "flag [name]"     Set a flag to determine behaviour.  Current flags
 100                          are: IPSRC_RND #IP Source is random (between min/max),
 101                               IPDST_RND, UDPSRC_RND,
 102                               UDPDST_RND, MACSRC_RND, MACDST_RND
 103
 104  pgset "udp_src_min 9"   set UDP source port min, If < udp_src_max, then
 105                          cycle through the port range.
 106
 107  pgset "udp_src_max 9"   set UDP source port max.
 108  pgset "udp_dst_min 9"   set UDP destination port min, If < udp_dst_max, then
 109                          cycle through the port range.
 110  pgset "udp_dst_max 9"   set UDP destination port max.
 111
 112  pgset "mpls 0001000a,0002000a,0000000a" set MPLS labels (in this example
 113                                          outer label=16,middle label=32,
 114                                          inner label=0 (IPv4 NULL)) Note that
 115                                          there must be no spaces between the
 116                                          arguments. Leading zeros are required.
 117                                          Do not set the bottom of stack bit,
 118                                          thats done automatically. If you do
 119                                          set the bottom of stack bit, that
 120                                          indicates that you want to randomly
 121                                          generate that address and the flag
 122                                          MPLS_RND will be turned on. You
 123                                          can have any mix of random and fixed
 124                                          labels in the label stack.
 125
 126  pgset "mpls 0"           turn off mpls (or any invalid argument works too!)
 127
 128  pgset stop               aborts injection. Also, ^C aborts generator.
 129
 130
 131 Example scripts
 132 ===============
 133
 134 A collection of small tutorial scripts for pktgen is in expamples dir.
 135
 136 pktgen.conf-1-1                  # 1 CPU 1 dev
 137 pktgen.conf-1-2                  # 1 CPU 2 dev
 138 pktgen.conf-2-1                  # 2 CPU's 1 dev
 139 pktgen.conf-2-2                  # 2 CPU's 2 dev
 140 pktgen.conf-1-1-rdos             # 1 CPU 1 dev w. route DoS
 141 pktgen.conf-1-1-ip6              # 1 CPU 1 dev ipv6
 142 pktgen.conf-1-1-ip6-rdos         # 1 CPU 1 dev ipv6  w. route DoS
 143 pktgen.conf-1-1-flows            # 1 CPU 1 dev multiple flows.
 144
 145 Run in shell: ./pktgen.conf-X-Y It does all the setup including sending.
 146
 147
 148 Interrupt affinity
 149 ===================
 150 Note when adding devices to a specific CPU there good idea to also assign
 151 /proc/irq/XX/smp_affinity so the TX-interrupts gets bound to the same CPU.
 152 as this reduces cache bouncing when freeing skb's.
 153
 154
 155 Current commands and configuration options
 156 ==========================================
 157
 158 ** Pgcontrol commands:
 159
 160 start
 161 stop
 162
 163 ** Thread commands:
 164
 165 add_device
 166 rem_device_all
 167 max_before_softirq
 168
 169
 170 ** Device commands:
 171
 172 count
 173 clone_skb
 174 debug
 175
 176 frags
 177 delay
 178
 179 src_mac_count
 180 dst_mac_count
 181
 182 pkt_size
 183 min_pkt_size
 184 max_pkt_size
 185
 186 mpls
 187
 188 udp_src_min
 189 udp_src_max
 190
 191 udp_dst_min
 192 udp_dst_max
 193
 194 flag
 195   IPSRC_RND
 196   TXSIZE_RND
 197   IPDST_RND
 198   UDPSRC_RND
 199   UDPDST_RND
 200   MACSRC_RND
 201   MACDST_RND
 202
 203 dst_min
 204 dst_max
 205
 206 src_min
 207 src_max
 208
 209 dst_mac
 210 src_mac
 211
 212 clear_counters
 213
 214 dst6
 215 src6
 216
 217 flows
 218 flowlen
 219
 220 References:
 221 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/
 222 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/
 223
 224 Paper from Linux-Kongress in Erlangen 2004.
 225 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/pktgen_paper.pdf
 226
 227 Thanks to:
 228 Grant Grundler for testing on IA-64 and parisc, Harald Welte,  Lennert Buytenhek
 229 Stephen Hemminger, Andi Kleen, Dave Miller and many others.
 230
 231
 232 Good luck with the linux net-development.