cl man page on IRIX

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CL(7M)									CL(7M)

NAME
     cl - CrayLink Driver

SYNOPSIS
     /hw/xplink/raw/*/*

DESCRIPTION
     The cl module provides a raw device interface to XPC (cross partition
     communication).  These devices take advantage of the XPC rendezvous
     capabilities to allow DMA transfers directly from the source to the
     destination without any intermediate copying if possible.	The DMA
     operation is done using the BTE which supports transfers of multiple
     cache lines on cache line boundaries.  Therefore, in order to avoid the
     overhead of the cl driver copying data to an intermediate buffer, the
     source and destination must be 128 byte aligned.  If the transfer is not
     a multiple of 128 bytes, only the last part of the cache line will be
     copied through an intermediate buffer.

     The cross partition raw devices are located in the directory
     /hw/xplink/raw/<remote_partition>/<device_number>, where
     <remote_partition> is the partition ID to which a device should be
     opened, and the <device_number> specifies which of the 16 possible
     devices to open.  These devices appear in the hwgraph(4) the first time a
     remote partition is discovered (or activated) as two digit hexadecimal
     numbers.  They are never removed.

     Once a cl device is opened using the open(2) system call (and closed
     using close(2)), the file descriptors may be used to exchanged data with
     the remote partition using the read(2), write(2), and select(2) system
     calls.  The devices provide a byte stream type interface.

     open(2), close(2), read(2), write(2), or select(2) will fail for the cl
     devices and return to the calling process if one or more of the following
     are true

     EIO	 XPC could not be established for the partition requested.

     ENODEV	 The partition to which communication is requested no longer
		 exists.

     ENODEV	 The cl raw device requested does not exist on the remote
		 partition.

									Page 1

CL(7M)									CL(7M)

     EINTR	 A synchronous read or write was interrupted before
		 completion.

     ENOTCONN	 The XPC channel for this raw device has been unexpectedly
		 disconnected.

     EWOULDBLOCK The call would have blocked if the O_NONBLOCK flag had not
		 been specified to the open(2) function.

     EBUSY	 The raw device is currently busy connecting or disconnecting
		 with the remote partition.

     EAGAIN	 The XPC layer is still setting up.

     ENOTSUP	 The partition we are trying to communicate with does not have
		 support for XPC.

FILES
     /hw/xplink/raw/*/*
     /var/sysgen/master.d/cl

SEE ALSO
     open(2), close(2), select(2), read(2), write(2), mkpart(1m), hwgraph(4)

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