3 HOWTO for the linux packet generator
4 ------------------------------------
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.
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]
21 For montoring and control pktgen creates:
22 /proc/net/pktgen/pgctrl
23 /proc/net/pktgen/kpktgend_X
29 /proc/net/pktgen/kpktgend_0
30 Name: kpktgend_0 max_before_softirq: 10000
33 Result: OK: max_before_softirq=10000
35 Most important the devices assigend to thread. Note! A device can only belong
42 Parm section holds configured info. Current hold running stats.
43 Result is printed after run or after interruption. Example:
47 Params: count 10000000 min_pkt_size: 60 max_pkt_size: 60
48 frags: 0 delay: 0 clone_skb: 1000000 ifname: eth1
50 dst_min: 10.10.11.2 dst_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
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
63 Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags)
64 763292pps 390Mb/sec (390805504bps) errors: 39664
66 Confguring threads and devices
67 ==============================
68 This is done via the /proc interface easiest done via pgset in the scripts
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.
79 pgset "delay 5000" adds delay to hard_start_xmit(). nanoseconds
81 pgset "dst 10.0.0.1" sets IP destination address
82 (BEWARE! This generator is very aggressive!)
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
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.
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.
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
104 pgset "udp_src_min 9" set UDP source port min, If < udp_src_max, then
105 cycle through the port range.
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.
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.
126 pgset "mpls 0" turn off mpls (or any invalid argument works too!)
128 pgset stop aborts injection. Also, ^C aborts generator.
134 A collection of small tutorial scripts for pktgen is in expamples dir.
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.
145 Run in shell: ./pktgen.conf-X-Y It does all the setup including sending.
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.
155 Current commands and configuration options
156 ==========================================
158 ** Pgcontrol commands:
221 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/
222 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/
224 Paper from Linux-Kongress in Erlangen 2004.
225 ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/pktgen_paper.pdf
228 Grant Grundler for testing on IA-64 and parisc, Harald Welte, Lennert Buytenhek
229 Stephen Hemminger, Andi Kleen, Dave Miller and many others.
232 Good luck with the linux net-development.