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4
Implementing the Configure Section
The configure section of a network device driver contains the code
that incorporates the device driver into the kernel, either statically or
dynamically. In a static configuration, the device driver’s
configure
interface registers callback routines, which allow the cfgmgr framework
to configure the driver into the kernel at a specified point during system
startup. In a dynamic configuration, the configure interface cooperates
with the cfgmgr framework to handle user-level requests to dynamically
configure, reconfigure, and query a network device driver at run time.
Because these tasks are common to all network drivers, the code has been
consolidated into a single routine called lan_configure( ). Routines with
the prefix lan_ reside in the lan_common.c source file. A network driver’s
configure( ) routine can simply call lan_configure( ) to carry out the
following tasks:
• CFG_OP_CONFIGURE
• CFG_OP_RECONFIGURE
• CFG_OP_UNCONFIGURE
• CFG_OP_QUERY
The if_el driver’s configure section contains an attributes data structure
and the el_configure( ) routine.
The following sections describe how to initialize the cfg_subsys_attr_t
data structure and how to set up the el_configure( ) routine:
• Declaring configure-related variables and initializing the
cfg_subsys_attr_t data structure (Section 4.1)
• Setting up the el_configure( ) routine (Section 4.2)
4.1 Declaring Configure-Related Variables and the
cfg_subsys_attr_t Data Structure
As part of implementing a device driver’s configure interface, you declare a
number of variables and initialize the cfg_subsys_attr_t data structure.
Implementing the Configure Section 4–1