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dat.conf

DAT.CONF(5)															       DAT.CONF(5)

NAME

       dat.conf - configuration file for static registration of user-level DAT rdma providers

DESCRIPTION

       The  DAT (direct access transport) architecture supports the use of multiple DAT providers within a single consumer application.  Consumers
       implicitly select a provider using the Interface Adapter name parameter passed to dat_ia_open().

       The subsystem that maps Interface Adapter names to  provider  implementations  is  known  as  the  DAT  registry.  When	a  consumer  calls
       dat_ia_open(),  the  appropriate  provider  is found and notified of the consumer's request to access the IA. After this point, all DAT API
       calls acting on DAT objects are automatically directed to the appropriate provider entry points.

       A persistent, administratively configurable database is used to store mappings from IA names to provider information. This provider  infor-
       mation  includes: the file system path to the provider library object, version information, and thread safety information. The location and
       format of the registry is platform dependent. This database is known as the Static Registry  (SR)  and  is  provided  via  entries  in  the
       dat.conf file. The process of adding a provider entry is termed Static Registration.

Registry File Format

	   * All characters after # on a line are ignored (comments).
	   * Lines on which there are no characters other than whitespace
	     and comments are considered blank lines and are ignored.
	   * Non-blank lines must have seven whitespace separated fields.
	     These fields may contain whitespace if the field is quoted
	     with double quotes. Within fields quoated with double quotes,
	     the backslash or qoute are valid escape sequences:
	   * Each non-blank line will contain the following fields:
	       - The IA Name.
	       - The API version of the library:
		 [k|u]major.minor where "major" and "minor" are both integers
		 in decimal format. User-level examples: "u1.2", and "u2.0".
	       - Whether the library is thread-safe: [threadsafe|nonthreadsafe]
	       - Whether this is the default section: [default|nondefault]
	       - The library image, version included, to be loaded.
	       - The vendor id and version of DAPL provider: id.major.minor
	       - ia params, IA specific parameters - device name and port
	       - platform params, (not used)

Example netdev entries for OpenFabrics rdma_cm providers, both v1.2 and v2.0

	       OpenIB-cma u1.2 nonthreadsafe default libdaplcma.so.1 dapl.1.2 "ib0 0" ""
	       ofa-v2-ib0 u2.0 nonthreadsafe default libdaplofa.so.2 dapl.2.0 "ib0 0" ""

	       NOTE: The OpenFabrics providers use <ia_params> to specify the device with one of the following:
		     network address, network hostname, or netdev name; along with port number.

		     The OpenIB- and ofa-v2- IA names are unique mappings. Reserved for OpenFabrics providers.

       The  default  location  for  this  configuration  file is /etc/dat.conf.  The file location may be overridden with the environment variable
       DAT_OVERRIDE=/your_own_directory/your_dat.conf.

SEE ALSO

								   25 March 2008						       DAT.CONF(5)