freebsd-skq/share/man/man4/en.4

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.\" $FreeBSD$
.\"
.Dd June 3, 2003
.Dt EN 4
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.Os
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.Sh NAME
.Nm en
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.Nd device driver for Midway-based ATM interfaces
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.Sh SYNOPSIS
.Cd "device en"
.Cd "device atm"
.Cd "device utopia"
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.Sh DESCRIPTION
The
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.Nm
device driver supports Midway-based ATM interfaces including the
Efficient Networks, Inc. ENI-155 and Adaptec ANA-59x0.
Midway is an AAL5 SAR (Segmentation and Reassembly) chip.
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.Pp
For configuring the card for IP see
.Xr natm 4 .
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.Pp
The following sysctls are recognized by the driver additionally to those
handled by
.Xr utopia 4 :
.Bl -tag -width XXX
.It Cm hw.atm.enX.istats
Contains an array of
.Vt uint32_t
with internal driver statistics.
.It Cm hw.atm.enX.debug
This is a bit map of debugging options.
This variable is only available when the driver is compiled with debugging
support.
.El
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.Pp
The driver supports the media options
.Ar sdh ,
.Ar noscramb
and
.Ar unassigned
(see
.Xr utopia 4 ).
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.Sh DIAGNOSTICS
.Bd -literal
en0 <Efficient Networks ENI-155p> rev 0 int a irq 5 on pci0:16
en0: ATM midway v0, board IDs 6.0, Utopia (pipelined), 512KB on-board RAM
en0: maximum DMA burst length = 64 bytes
en0: 7 32KB receive buffers, 8 32KB transmit buffers allocated
.Ed
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.Sh CAVEATS
The driver extensively uses DMA on PCI.
The first
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generation PCI chipsets do not work or exhibit poor performance.
.Sh SEE ALSO
.Xr natm 4 ,
.Xr natmip 4 ,
.Xr utopia 4 ,
.Xr ifconfig 8 ,
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.Xr route 8
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.Sh AUTHORS
.An Chuck Cranor
of Washington University implemented EN driver
in 1996 for
.Nx .