Provided by: dapl2-utils_2.1.5-1_amd64 
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 information 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)
OpenFabrics RDMA providers:
Provider options for both 1.2 and 2.0, each using different CM services
1. cma - OpenFabrics rdma_cm - uses rdma_cm services for connections
- requires IPoIB and SA/SM services for IB
- netdev used for device name, without port
designation (ia_params)
- Supports any transport rdma_cm supports
including IB, iWARP, RoCEE
- libdaplcma.so (1.2), libdaplofa (2.0)
2. scm - uDAPL socket based CM - exchanges CM information over sockets
- eliminates the need for rdma_cm, IPoIB, and SA
for IB
- verbs device used for device name with port
designation (ia_param)
- Supports IB, RoCEE. Doesn't support iWARP
- libdaplscm.so (1.2), libdaploscm (2.0)
3. ucm - uDAPL unreliable IB CM - exchanges CM information via IB UD QP's
- eliminates the need for sockets or rdma_cm
- verbs device used for device name with port
designation (ia_param)
- Supports IB only, no name service.
- libdaplucm.so (1.2), libdaploucm (2.0)
Example entries for each OpenFabrics provider
1. cma - OpenFarbrics rdma_cm (v1.2 and v2.0 examples)
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" ""
ofa-v2-iwarp u2.0 nonthreadsafe default libdaplofa.so.2 dapl.2.0 "eth2 0" ""
ofa-v2-cma-roe-eth2 u2.0 nonthreadsafe default libdaplofa.so.2 dapl.2.0 "eth2 0"
""
ofa-v2-cma-roe-eth3 u2.0 nonthreadsafe default libdaplofa.so.2 dapl.2.0 "eth3 0"
""
NOTE: The OpenFabrics CMA providers use <ia_params> to specify the device with one
of the following:
network address, network hostname, or netdev name; along with port number.
2. scm - uDAPL socket based CM (v1.2 and v2.0 examples)
OpenIB-mlx4_0-1 u1.2 nonthreadsafe default libdaplscm.so.1 dapl.1.2 "mlx4_0 1" ""
OpenIB-ipath0-1 u1.2 nonthreadsafe default libdaplscm.so.1 dapl.1.2 "ipath0 1" ""
ofa-v2-mlx4_0-1 u2.0 nonthreadsafe default libdaploscm.so.2 dapl.2.0 "mlx4_0 1" ""
ofa-v2-mlx4_0-2 u2.0 nonthreadsafe default libdaploscm.so.2 dapl.2.0 "mlx4_0 2" ""
ofa-v2-mlx4_1-1 u2.0 nonthreadsafe default libdaploscm.so.2 dapl.2.0 "mlx4_1 1" ""
ofa-v2-ehca0-1 u2.0 nonthreadsafe default libdaploscm.so.2 dapl.2.0 "ehca0 1" ""
ofa-v2-scm-roe-mlx4_0-1 u2.0 nonthreadsafe default libdaploscm.so.2 dapl.2.0
"mlx4_0 1" ""
3. ucm - uDAPL unreliable IB CM (not supported in 1.2, v2.0 examples)
ofa-v2-mlx4_0-1u u2.0 nonthreadsafe default libdaploucm.so.2 dapl.2.0 "mlx4_0 1"
""
ofa-v2-mlx4_0-2u u2.0 nonthreadsafe default libdaploucm.so.2 dapl.2.0 "mlx4_0 2"
""
ofa-v2-ipath0-1u u2.0 nonthreadsafe default libdaploucm.so.2 dapl.2.0 "ipath0 1"
""
ofa-v2-ehca0-1u u2.0 nonthreadsafe default libdaploucm.so.2 dapl.2.0 "ehca0 1" ""
Note: 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 rdma_cm verbs socket
25 March 2008 DAT.CONF(5)