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#define is_ac is_ed->ess_ac 2
#define ztime is_ed->ess_ztime 3
#define ctrblk is_ed->ess_ctrblk 4
#define is_if is_ac.ac_if 5
#define is_addr is_ac.ac_enaddr 6
1 Declares an instance of the ether_driver data structure and calls
it is_ed. All network drivers must have an ether_driver data
structure. By convention, a pointer to this data structure is the first
element in the softc data structure.
2 Maps the ess_ac member of the ether_driver data structure to
the alternate name is_ac. The ess_ac member is referred to as the
“Ethernet common part” and is actually an instance of the arpcom data
structure. Figure 3–2 shows the is_ac alternate name and associated
mapping.
3 Maps the ess_ztime member of the ether_driver data structure to
the alternate name ztime. The ess_ztime member stores the time
counters that were last zeroed. Figure 3–2 shows the ztime alternate
name and associated mapping.
4 Maps the ess_ctrblk member of the ether_driver data structure
to the alternate name ctrblk. The ess_ctrblk member is referred
to as the “counter block” and is actually an instance of the estat data
structure. Figure 3–2 shows the ctrblk alternate name and associated
mapping.
You must define this line in your network device driver if you plan to
use ADD_RECV_MPACKET, ADD_RECV_PACKET, ADD_XMIT_MPACKET,
and ADD_XMIT_PACKET for maintaining LAN device counters. Each of
these macros references the ctrblk alternate name.
5 Maps the ac_if member of the arpcom data structure to the alternate
name is_if. The ac_if member is referred to as the “network-visible
interface” and is actually an instance of the ifnet data structure.
Figure 3–2 shows the is_if alternate name and associated mapping.
6 Maps the ac_enaddr member of the arpcom data structure to the
alternate name is_addr. The name ac_enaddr is actually an alternate
name for ac_hwaddr, which is the name of the actual member of
the arpcom data structure that stores the hardware address. The
if_ether.h file defines the ac_enaddr alternate name. Figure 3–2
shows the is_addr alternate name and associated mapping.
Defining the softc Data Structure 3–3