-How to use the Linux packet generator module.
-
-1. Enable CONFIG_NET_PKTGEN to compile and build pktgen.o, install it
- in the place where insmod may find it.
-2. Cut script "ipg" (see below).
-3. Edit script to set preferred device and destination IP address.
-3a. Create more scripts for different interfaces. Up to thirty-two
- pktgen processes can be configured and run at once by using the
- 32 /proc/net/pktgen/pg* files.
-4. Run in shell: ". ipg"
-5. After this two commands are defined:
- A. "pg" to start generator and to get results.
- B. "pgset" to change generator parameters. F.e.
- pgset "clone_skb 100" sets the number of copies of the same packet
- will be sent before a new packet is allocated
- pgset "clone_skb 0" use multiple SKBs for packet generation
- 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 "ipg 5000" sets artificial gap inserted between packets
- to 5000 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 "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.
-
----- cut here
-
-#! /bin/sh
-
-modprobe pktgen
-
-PGDEV=/proc/net/pktgen/pg0
-
-function pgset() {
- local result
-
- echo $1 > $PGDEV
-
- result=`cat $PGDEV | fgrep "Result: OK:"`
- if [ "$result" = "" ]; then
- cat $PGDEV | fgrep Result:
- fi
-}
-
-function pg() {
- echo inject > $PGDEV
- cat $PGDEV
-}
-
-pgset "odev eth0"
-pgset "dst 0.0.0.0"
-
----- cut here
+
+
+ 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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