1998-07-29 05:42:20 +00:00
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.Dd December 29, 1997
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.Dt EN 4
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.Os BSD
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.Sh NAME
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.Nm en
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.Nd
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device driver for Midway-based ATM interfaces
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.Sh SYNOPSIS
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.Cd "device en0"
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.Cd "pseudo-device atm"
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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 ALL5 SAR (Segmentation and Reassenbly) chip.
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.Pp
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The driver only supports ATM PVCs. SVC or ATM-ARP is not supported.
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.Pp
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To configure the card for IP, use something like:
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.Dl # ifconfig en0 128.252.200.1 netmask 0xffffff00 up
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To add a PVC to a host you must use the ``route'' command:
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.Dl # route add -iface <remote IP address> -link en0:z.0.x.y
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where x and y are the byte encoding of the VCI to use, and z is the
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byte encoding of the following flags.
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.Dl 0x01 (use AAL5),
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.Dl 0x02 (if using AAL5, use a LLCSNAP header)
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Thus, parameter 3 means AAL5 and LLC/SNAP encapsulation.
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Note that BPF works only with LLC/SNAP encapsulation.
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.Sh EXAMPLES
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Suppose you have 2 hosts 128.252.200.1 and 128.252.200.2 connected
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by ATM through PVC # 201 (0xc9).
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To enable the link use the following commands:
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.Dl on host 128.252.200.1:
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.Dl # ifconfig en0 128.252.200.1 netmask 0xffffff00 up
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.Dl # route add -iface 128.252.200.2 -link en0:3.0.0.c9
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.Pp
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.Dl on host 128.252.200.2:
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.Dl # ifconfig en0 128.252.200.2 netmask 0xffffff00 up
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.Dl # route add -iface 128.252.200.1 -link en0:3.0.0.c9
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "en0 <Efficient Networks ENI-155p> rev 0 int a irq 5 on pci0:16"
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.It "en0: ATM midway v0, board IDs 6.0, Utopia (pipelined), 512KB on-board RAM"
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.It "en0: maximum DMA burst length = 64 bytes"
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.It "en0: 7 32KB receive buffers, 8 32KB transmit buffers allocated"
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.El
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.Sh CAVEATS
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The driver extensively uses DMA on PCI. 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 ifconfig 8 ,
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.Xr pvcsif 8 ,
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1998-08-31 16:41:09 +00:00
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.Xr pvctxctl 8 ,
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.Xr route 8
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1998-07-29 05:42:20 +00:00
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.Sh AUTHORS
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1999-08-15 10:48:36 +00:00
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.An Chuck Cranor
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of Washington University implemented EN driver
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in 1996 for
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.Nx .
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