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diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt new file mode 100644 index 00000000000..cc4b4d04129 --- /dev/null +++ b/Documentation/networking/pktgen.txt @@ -0,0 +1,214 @@ + + + HOWTO for the linux packet generator + ------------------------------------ + +Date: 041221 + +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 continious sends untill explicitl 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 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. + + +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 +========================================== + +** Pgcontrol commands: + +start +stop + +** Thread commands: + +add_device +rem_device_all +max_before_softirq + + +** Device commands: + +count +clone_skb +debug + +frags +delay + +src_mac_count +dst_mac_count + +pkt_size +min_pkt_size +max_pkt_size + +udp_src_min +udp_src_max + +udp_dst_min +udp_dst_max + +flag + IPSRC_RND + TXSIZE_RND + IPDST_RND + UDPSRC_RND + UDPDST_RND + MACSRC_RND + MACDST_RND + +dst_min +dst_max + +src_min +src_max + +dst_mac +src_mac + +clear_counters + +dst6 +src6 + +flows +flowlen + +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. + + +Good luck with the linux net-development.
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