daplt

- uDAPL service driver

Synopsis

daplt@0:daplt

Description

The daplt module is the driver component of the uDAPL service provider which implements the provider functions of the uDAPL Specification 1.2 described under libdat(3LIB).

The daplt module is a child of the IB nexus driver, ib(7D), and layers on top of the Solaris kernel IB Transport Layer, ibtl(7D). The daplt driver uses the InfiniBand Transport Framework (IBTF). (See ibtl(7D), ibcm(7D), and ib(7D) to access privileged IB VERBS.)

The daplt driver copies out various HCA H/W object reference handles, including working and completion queues and User Access Region registers, to its own uDAPL service provider library. The library can refer back to these object handles and use them to mmap(2) in the mapping of these H/W queues and registers from the HCA driver. This process enables time-critical non-privileged IB VERBS such as send/receive work elements, RDMA read/write and memory window bind, to be invoked in the userland library and performed directly by the firmware or hardware. As a result, OS and network stack are bypassed, achieving true zero data copy with the lowest possible latency.

Files

/kernel/drv/sparcv9/daplt

64-bit SPARC ELF kernel driver

/kernel/drv/amd64/daplt

64–bit x86 ELF kernel driver

/kernel/drv/daplt.conf

driver configuration file

/dev/daplt

special character device.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

mmap(2), libdat(3LIB), driver.conf(4), attributes(5), ib(7D), ibcm(7D), ibdm(7D), ibtl(7D)

uDAPL Specification 1.2