1.\" $NetBSD: xennet.4,v 1.5 2020/04/05 19:03:30 jdolecek Exp $ 2.\" 3.\" Copyright (c) 2011 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Jean-Yves Migeon <jym@NetBSD.org>. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd April 5, 2020 31.Dt XENNET 4 xen 32.Os 33.Sh NAME 34.Nm xennet 35.Nd Xen frontend paravirtualized network interface 36.Sh SYNOPSIS 37.Cd "xennet* at xenbus?" 38.Sh DESCRIPTION 39The 40.Nm 41interface forms the frontend part of the paravirtualized drivers 42used by 43.Tn Xen 44guest domains to have network connectivity. 45.Pp 46When the host domain is 47.Nx , 48the endpoint of the 49.Nm 50interface is a 51.Xr xvif 4 52interface. 53In the XenStore, 54.Nm xvif 55and 56.Nm xennet 57are identified by 58.Dq vif 59(virtual interface) 60entries. 61.Pp 62Conceptually, frontends and backends drivers are 63similar to two Ethernet cards connected via a crossover cable. 64.Pp 65.Nm xennet 66interfaces can pass VLAN tagged packets. 67.Sh DIAGNOSTICS 68.Bl -diag 69.It "xennet%d: can't read mac address, err %d" 70The MAC address for this interface could not be read from XenStore. 71.It "xennet%d: %s is not a valid mac address" 72The MAC address specified in the configuration file of the newly 73created guest domain is invalid. 74.It "xennet%d: using event channel %d" 75The 76.Tn Xen 77event channel (virtual interrupt) ID 78associated to this 79.Nm . 80.It "xennet%d: using RX copy mode" 81The 82.Nm 83and its associated endpoint use copy mode for communication: packets 84are copied from one domain's memory to another. 85.El 86.Sh SEE ALSO 87.Xr bridge 4 , 88.Xr ifmedia 4 , 89.Xr xenbus 4 , 90.Xr xvif 4 , 91.Xr ifconfig 8 92.Sh HISTORY 93The 94.Nm 95driver first appeared in 96.Nx 3.0 . 97.Sh AUTHORS 98.An -nosplit 99The 100.Nm 101driver was written by 102.An Manuel Bouyer Aq Mt bouyer@NetBSD.org 103and 104.An Christian Limpach Aq Mt chris@pin.lu . 105