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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 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 | ||
115 | Example scripts | |
116 | =============== | |
117 | ||
118 | A collection of small tutorial scripts for pktgen is in expamples dir. | |
119 | ||
120 | pktgen.conf-1-1 # 1 CPU 1 dev | |
121 | pktgen.conf-1-2 # 1 CPU 2 dev | |
122 | pktgen.conf-2-1 # 2 CPU's 1 dev | |
123 | pktgen.conf-2-2 # 2 CPU's 2 dev | |
124 | pktgen.conf-1-1-rdos # 1 CPU 1 dev w. route DoS | |
125 | pktgen.conf-1-1-ip6 # 1 CPU 1 dev ipv6 | |
126 | pktgen.conf-1-1-ip6-rdos # 1 CPU 1 dev ipv6 w. route DoS | |
127 | pktgen.conf-1-1-flows # 1 CPU 1 dev multiple flows. | |
128 | ||
129 | Run in shell: ./pktgen.conf-X-Y It does all the setup including sending. | |
130 | ||
131 | ||
132 | Interrupt affinity | |
133 | =================== | |
134 | Note 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. | |
136 | as this reduces cache bouncing when freeing skb's. | |
137 | ||
138 | ||
139 | Current commands and configuration options | |
140 | ========================================== | |
141 | ||
142 | ** Pgcontrol commands: | |
143 | ||
144 | start | |
145 | stop | |
146 | ||
147 | ** Thread commands: | |
148 | ||
149 | add_device | |
150 | rem_device_all | |
151 | max_before_softirq | |
152 | ||
153 | ||
154 | ** Device commands: | |
155 | ||
156 | count | |
157 | clone_skb | |
158 | debug | |
159 | ||
160 | frags | |
161 | delay | |
162 | ||
163 | src_mac_count | |
164 | dst_mac_count | |
165 | ||
166 | pkt_size | |
167 | min_pkt_size | |
168 | max_pkt_size | |
169 | ||
170 | udp_src_min | |
171 | udp_src_max | |
172 | ||
173 | udp_dst_min | |
174 | udp_dst_max | |
175 | ||
176 | flag | |
177 | IPSRC_RND | |
178 | TXSIZE_RND | |
179 | IPDST_RND | |
180 | UDPSRC_RND | |
181 | UDPDST_RND | |
182 | MACSRC_RND | |
183 | MACDST_RND | |
184 | ||
185 | dst_min | |
186 | dst_max | |
187 | ||
188 | src_min | |
189 | src_max | |
190 | ||
191 | dst_mac | |
192 | src_mac | |
193 | ||
194 | clear_counters | |
195 | ||
196 | dst6 | |
197 | src6 | |
198 | ||
199 | flows | |
200 | flowlen | |
201 | ||
202 | References: | |
203 | ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/ | |
204 | ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/ | |
205 | ||
206 | Paper from Linux-Kongress in Erlangen 2004. | |
207 | ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/pktgen_paper.pdf | |
208 | ||
209 | Thanks to: | |
210 | Grant Grundler for testing on IA-64 and parisc, Harald Welte, Lennert Buytenhek | |
211 | Stephen Hemminger, Andi Kleen, Dave Miller and many others. | |
212 | ||
213 | ||
214 | Good luck with the linux net-development. |