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| HOWTO for the linux packet generator |
| ------------------------------------ |
| |
| Date: 041221 |
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| 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 < udp_src_max, then |
| cycle through the port range. |
| |
| pgset "udp_src_max 9" set UDP source port max. |
| pgset "udp_dst_min 9" set UDP destination port min, If < udp_dst_max, then |
| cycle through the port range. |
| pgset "udp_dst_max 9" set UDP destination port max. |
| |
| pgset "mpls 0001000a,0002000a,0000000a" set MPLS labels (in this example |
| outer label=16,middle label=32, |
| inner label=0 (IPv4 NULL)) Note that |
| there must be no spaces between the |
| arguments. Leading zeros are required. |
| Do not set the bottom of stack bit, |
| thats done automatically. If you do |
| set the bottom of stack bit, that |
| indicates that you want to randomly |
| generate that address and the flag |
| MPLS_RND will be turned on. You |
| can have any mix of random and fixed |
| labels in the label stack. |
| |
| pgset "mpls 0" turn off mpls (or any invalid argument works too!) |
| |
| pgset stop aborts injection. Also, ^C aborts generator. |
| |
| |
| Example scripts |
| =============== |
| |
| A collection of small tutorial scripts for pktgen is in expamples dir. |
| |
| pktgen.conf-1-1 # 1 CPU 1 dev |
| pktgen.conf-1-2 # 1 CPU 2 dev |
| pktgen.conf-2-1 # 2 CPU's 1 dev |
| pktgen.conf-2-2 # 2 CPU's 2 dev |
| pktgen.conf-1-1-rdos # 1 CPU 1 dev w. route DoS |
| pktgen.conf-1-1-ip6 # 1 CPU 1 dev ipv6 |
| pktgen.conf-1-1-ip6-rdos # 1 CPU 1 dev ipv6 w. route DoS |
| pktgen.conf-1-1-flows # 1 CPU 1 dev multiple flows. |
| |
| Run in shell: ./pktgen.conf-X-Y It does all the setup including sending. |
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| Interrupt affinity |
| =================== |
| Note when adding devices to a specific CPU there good idea to also assign |
| /proc/irq/XX/smp_affinity so the TX-interrupts gets bound to the same CPU. |
| as this reduces cache bouncing when freeing skb's. |
| |
| |
| Current commands and configuration options |
| ========================================== |
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| ** Pgcontrol commands: |
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| start |
| stop |
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| ** Thread commands: |
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| add_device |
| rem_device_all |
| max_before_softirq |
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| ** Device commands: |
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| count |
| clone_skb |
| debug |
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| frags |
| delay |
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| src_mac_count |
| dst_mac_count |
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| pkt_size |
| min_pkt_size |
| max_pkt_size |
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| mpls |
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| udp_src_min |
| udp_src_max |
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| udp_dst_min |
| udp_dst_max |
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| flag |
| IPSRC_RND |
| TXSIZE_RND |
| IPDST_RND |
| UDPSRC_RND |
| UDPDST_RND |
| MACSRC_RND |
| MACDST_RND |
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| dst_min |
| dst_max |
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| src_min |
| src_max |
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| dst_mac |
| src_mac |
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| clear_counters |
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| dst6 |
| src6 |
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| flows |
| flowlen |
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| References: |
| ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/ |
| ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/examples/ |
| |
| Paper from Linux-Kongress in Erlangen 2004. |
| ftp://robur.slu.se/pub/Linux/net-development/pktgen-testing/pktgen_paper.pdf |
| |
| Thanks to: |
| Grant Grundler for testing on IA-64 and parisc, Harald Welte, Lennert Buytenhek |
| Stephen Hemminger, Andi Kleen, Dave Miller and many others. |
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| Good luck with the linux net-development. |
