Linux packet generator is a tool to generate packets at very high speed in the kernel.
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:
# cat /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 assigned to thread. Note! A device can only belong to one thread.
Param section holds configured info. Current hold running stats. Result is printed after run or after interruption. Example:
# cat /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
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 addres
(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.
A collection of small tutorial scripts for pktgen is in expamples dir.
Run in shell: ./pktgen.conf-X-Y It does all the setup including sending.
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.
Pgcontrol commands:
Thread commands:
Device commands:
Grant Grundler for testing on IA-64 and parisc, Harald Welte, Lennert Buytenhek Stephen Hemminger, Andi Kleen, Dave Miller and many others.