.\"	$NetBSD: esh.4,v 1.2 1998/05/17 16:46:06 kml Exp $
.\"
.\" Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Kevin Lahey of the Numerical Aerospace Simulation Facility,
.\" NASA Ames Research Center.
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.Dd January 28, 1998
.Dt ESH 4
.Os NetBSD
.Sh NAME
.Nm esh
.Nd device driver RoadRunner-based HIPPI interfaces
.Sh SYNOPSIS
.Cd "esh* at pci? dev ? function ?"
.Sh DESCRIPTION
The
.Nm
device driver supports the Essential Communications RoadRunner-based 
HIPPI interfaces.  With some modifications, the driver could be 
made to support the Gigabit Ethernet card based on the same chip.
.Pp
HIPPI is an 800-megabit/sec networking technology which supports
extremely large packet sizes.  In order to efficiently use this
network, the kernel should be configured with extra mbufs, and
the default socket buffer size should be increased to at least
192KB, regardless of the expected bandwidth-delay product of the
network.
.Pp
HIPPI ARP is not widely used, and the NetBSD stack does not support it
(yet).  In order to define the mappings between IP addresses and
ifields (the HIPPI MAC addresses), the administrator must make
link-layer entries in the routing table using the
.Xr route 8
command:
.Bd -unfilled -offset indent
route add -interface 129.99.154.101 -llinfo -link esh0:3.0.0.65
.Ed
.Pp
.\" .Sh OPTIONS
.Sh MEDIA SELECTION
Media selection is not yet supported for this device.
.\" .Sh DIAGNOSTICS
.Sh BUGS
The card must be tuned for proper and efficient DMA operation.
The appropriate values vary based on the system.  
The eshconfig(8) program is used for this.
.Sh SEE ALSO
.Xr eshconfig 8 ,
.Xr ifconfig 8 ,
.Xr intro 4 ,
.Xr route 8 ,
.Xr pci 4