81 lines
1.8 KiB
Groff
81 lines
1.8 KiB
Groff
.\" $FreeBSD$
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.\"
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.Dd July 16, 2005
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.Dt EN 4
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.Os
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.Sh NAME
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.Nm en
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.Nd "device driver for Midway-based ATM interfaces"
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.Sh SYNOPSIS
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To compile support for the
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.Nm
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driver into your kernel, place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device en"
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.Cd "device atm"
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.Cd "device utopia"
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.Ed
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.Pp
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Alternatively, to load the
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.Nm
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driver at boot time, place the following liness in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_en_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports Midway-based ATM interfaces including the
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Efficient Networks, Inc.\& ENI-155 and Adaptec ANA-59x0.
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Midway is an AAL5 SAR (Segmentation and Reassembly) chip.
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.Pp
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For configuring the card for IP see
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.Xr natmip 4 .
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.Pp
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The following sysctls are recognized by the driver additionally to those
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handled by
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.Xr utopia 4 :
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.Bl -tag -width indent
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.It Va hw.atm.enX.istats
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Contains an array of
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.Vt uint32_t
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with internal driver statistics.
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.It Va hw.atm.enX.debug
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This is a bit map of debugging options.
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This variable is only available when the driver is compiled with debugging
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support.
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.El
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.Pp
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The driver supports the media options
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.Cm sdh ,
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.Cm noscramb
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and
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.Cm unassigned
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(see
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.Xr utopia 4 ) .
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.Sh DIAGNOSTICS
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.Bd -literal
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en0 <Efficient Networks ENI-155p> rev 0 int a irq 5 on pci0:16
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en0: ATM midway v0, board IDs 6.0, Utopia (pipelined), 512KB on-board RAM
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en0: maximum DMA burst length = 64 bytes
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en0: 7 32KB receive buffers, 8 32KB transmit buffers allocated
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.Ed
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.Sh CAVEATS
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The driver extensively uses DMA on PCI.
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The first
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generation PCI chipsets do not work or exhibit poor performance.
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.Sh SEE ALSO
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.Xr natm 4 ,
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.Xr natmip 4 ,
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.Xr utopia 4 ,
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.Xr ifconfig 8 ,
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.Xr route 8
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.Sh AUTHORS
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.An Chuck Cranor
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of Washington University implemented
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.Nm
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driver in 1996 for
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.Nx .
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