Add a manual page for pkt-gen.
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tools/tools/netmap/pkt-gen.8
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tools/tools/netmap/pkt-gen.8
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.\" Copyright (c) 2016, George V. Neville-Neil
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright notice,
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.\" this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 1, 2016
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.Dt PKT-GEN 8
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.Os
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.Sh NAME
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.Nm pkt-gen
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.Nd Packet generator for use with
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.Xr netmap 4
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.Sh SYNOPSIS
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.Bl -item -compact
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.It
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.Nm
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.Op Fl i Ar interface
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.Op Fl f Ar function
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.Op Fl n Ar count
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.Op Fl t Ar pkts_to_send
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.Op Fl r Ar pkts_to_receive
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.Op Fl l Ar pkt_size
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.Op Fl d Ar dst_ip[:port[-dst_ip:port]]
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.Op Fl s Ar src_ip[:port[-src_ip:port]]
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.Op Fl D Ar dst-mac
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.Op Fl S Ar src-mac
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.Op Fl a Ar cpu_id
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.Op Fl b Ar burst size
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.Op Fl c Ar cores
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.Op Fl p Ar threads
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.Op Fl T Ar report_ms
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.Op Fl P
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.Op Fl w Ar wait_for_link_time
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.Op Fl R Ar rate
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.Op Fl X
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.Op Fl H Ar len
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.Op Fl P Ar xfile
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.Op Fl z
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.Op Fl Z
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.Sh DESCRIPTION
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.Nm
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generates and receives raw network packets using
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.Xr netmap 4 .
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The arguments are as follows:
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.Pp
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.Bl -tag -width Ds
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.It Fl i Ar interface
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Network interface name.
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.It Fl f Ar function tx rx ping pong
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Set the function to transmit, receive of ping/pong.
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.It Fl n count
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Number of iterations (can be 0).
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.It Fl t pkts_to_send
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Number of packets to send. Also forces transmit mode.
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.It Fl r Ar pkts_to_receive
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Number of packets to receive. Also forces rx mode.
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.It Fl l Ar pkt_size
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Packet size in bytes excluding CRC.
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.It Fl d Ar dst_ip[:port[-dst_ip:port]]
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Destination IPv4 address and port, single or range.
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.It Fl s Ar src_ip[:port[-src_ip:port]]
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Source IPv4 address and port, single or range.
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.It Fl D Ar dst-mac
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Destination MAC address in colon notation.
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.It Fl S Ar src-mac
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Source MAC address in colon notation.
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.It Fl a Ar cpu_id
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Tie
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.Nm
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to a particular CPU core using
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.Xr setaffinity 2.
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.It Fl b Ar burst size
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Set the size of a burst of packets.
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.It Fl c Ar cores
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Number of cores to use.
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.It Fl p Ar threads
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Number of threads to use.
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.It Fl T Ar report_ms
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Number of milliseconds between reports.
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.It Fl P
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Use libpcap instead of netmap for reading or writing.
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.It Fl w Ar wait_for_link_time
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Number of seconds to wait to make sure that the network link is up. A
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network device driver may take some time to create a new
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transmit/receive ring pair when
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.Xr netmap 4
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requests one.
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.It Fl R Ar rate
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Packet transmission rate. Not setting the packet transmission rate tells
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.Nm
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to transmit packets as quickly as possible. On servers from 2010 on-wards
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.Xr netmap 4
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is able to completely use all of the bandwidth of a 10 or 40Gbps link,
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so this option should be used unless your intention is to saturate the link.
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.It Fl X
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Dump payload transmitted or received.
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.It Fl H Ar len
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Add empty virtio-net-header with size 'len'. This option is only use
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with Virtual Machine technologies that use virtio as a network interface.
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.It Fl P Ar file
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Load the packet from a pcap file rather than constructing it inside of
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.Nm
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.It Fl z
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Use random IPv4 src address/port
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.It Fl Z
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Use random IPv4 dst address/port
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.El
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.Pp
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.Nm
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is a raw packet generator that can utilize either
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.Xr netmap 4
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or
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.Xr bpf 4
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but which is most often uses with
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.Xr netmap 4 .
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The
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.Ar interface name
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used depends upon how the underlying Ethernet driver exposes its
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transmit and receive rings to
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.Xr netmap 4 .
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Most modern network interfaces that support 10Gbps and higher speeds
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have several transmit and receive rings that are used by the operating
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system to balance traffic across the interface.
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.Nm
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can peel off one or more of the transmit or receive rings for its own
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use without interfering with packets that might otherwise be destined
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for the host. For example on a system with a Chelsio Network
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Interface Card (NIC) the interface specification of
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.Ar -i netmap:ncxl0
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gives
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.Nm
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access to a pair of transmit and receive rings that are separate from
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the more commonly known cxl0 interface, which is used by the operating
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system's TCP/IP stack.
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.Sh EXAMPLES
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Capture and count all packets arriving on the operating system's cxl0
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interface. Using this will block packets from reaching the operating
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system's network stack.
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.Dl
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.Pp
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.Nm
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-i cxl0 -f rx
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.Pp
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Send a stream of fake DNS packets between two hosts with a packet
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length of 128 bytes. You must set the destination MAC address for
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packets to be received by the target host.
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.Pp
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.Dl
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.Nm
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-i netmap:ncxl0 -f tx -s 172.16.0.1:53 -d 172.16.1.3:53 -D 00:07:43:29:2a:e0
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.Sh FILES
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.Xr netmap 4
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.Sh SEE ALSO
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.Xr netmap 4
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.Sh AUTHORS
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This manual page was written by
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.An George V. Neville-Neil Aq gnn@FreeBSD.org .
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