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3 HOWTO for the linux packet generator
4 ------------------------------------
5
6Date: 041221
7
8Enable CONFIG_NET_PKTGEN to compile and build pktgen.o either in kernel
9or as module. Module is preferred. insmod pktgen if needed. Once running
10pktgen creates a thread on each CPU where each thread has affinty it's CPU.
11Monitoring and controlling is done via /proc. Easiest to select a suitable
12a sample script and configure.
13
14On a dual CPU:
15
16ps aux | grep pkt
17root 129 0.3 0.0 0 0 ? SW 2003 523:20 [pktgen/0]
18root 130 0.3 0.0 0 0 ? SW 2003 509:50 [pktgen/1]
19
20
21For montoring and control pktgen creates:
22 /proc/net/pktgen/pgctrl
23 /proc/net/pktgen/kpktgend_X
24 /proc/net/pktgen/ethX
25
26
27Viewing threads
28===============
29/proc/net/pktgen/kpktgend_0
30Name: kpktgend_0 max_before_softirq: 10000
31Running:
32Stopped: eth1
33Result: OK: max_before_softirq=10000
34
35Most important the devices assigend to thread. Note! A device can only belong
36to one thread.
37
38
39Viewing devices
40===============
41
42Parm section holds configured info. Current hold running stats.
43Result is printed after run or after interruption. Example:
44
45/proc/net/pktgen/eth1
46
47Params: 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:
56Current:
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
63Result: OK: 13101142(c12220741+d880401) usec, 10000000 (60byte,0frags)
64 763292pps 390Mb/sec (390805504bps) errors: 39664
65
66Confguring threads and devices
67==============================
68This is done via the /proc interface easiest done via pgset in the scripts
69
70Examples:
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 continious sends untill explicitl 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 stop aborts injection. Also, ^C aborts generator.
113
114
115Example scripts
116===============
117
118A collection of small tutorial scripts for pktgen is in expamples dir.
119
120pktgen.conf-1-1 # 1 CPU 1 dev
121pktgen.conf-1-2 # 1 CPU 2 dev
122pktgen.conf-2-1 # 2 CPU's 1 dev
123pktgen.conf-2-2 # 2 CPU's 2 dev
124pktgen.conf-1-1-rdos # 1 CPU 1 dev w. route DoS
125pktgen.conf-1-1-ip6 # 1 CPU 1 dev ipv6
126pktgen.conf-1-1-ip6-rdos # 1 CPU 1 dev ipv6 w. route DoS
127pktgen.conf-1-1-flows # 1 CPU 1 dev multiple flows.
128
129Run in shell: ./pktgen.conf-X-Y It does all the setup including sending.
130
131
132Interrupt affinity
133===================
134Note when adding devices to a specific CPU there good idea to also assign
135/proc/irq/XX/smp_affinity so the TX-interrupts gets bound to the same CPU.
136as this reduces cache bouncing when freeing skb's.
137
138
139Current commands and configuration options
140==========================================
141
142** Pgcontrol commands:
143
144start
145stop
146
147** Thread commands:
148
149add_device
150rem_device_all
151max_before_softirq
152
153
154** Device commands:
155
156count
157clone_skb
158debug
159
160frags
161delay
162
163src_mac_count
164dst_mac_count
165
166pkt_size
167min_pkt_size
168max_pkt_size
169
170udp_src_min
171udp_src_max
172
173udp_dst_min
174udp_dst_max
175
176flag
177 IPSRC_RND
178 TXSIZE_RND
179 IPDST_RND
180 UDPSRC_RND
181 UDPDST_RND
182 MACSRC_RND
183 MACDST_RND
184
185dst_min
186dst_max
187
188src_min
189src_max
190
191dst_mac
192src_mac
193
194clear_counters
195
196dst6
197src6
198
199flows
200flowlen
201
202References:
203ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/
204ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/
205
206Paper from Linux-Kongress in Erlangen 2004.
207ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/pktgen_paper.pdf
208
209Thanks to:
210Grant Grundler for testing on IA-64 and parisc, Harald Welte, Lennert Buytenhek
211Stephen Hemminger, Andi Kleen, Dave Miller and many others.
212
213
214Good luck with the linux net-development.