le(7)le(7)NAMEle - LeMAC Ethernet interface
SYNOPSIS
config_driver leDESCRIPTION
The le interface provides access to a 10 Mb/s Ethernet network through
the LeMAC controller.
The host's Internet address is specified at boot time with an SIOCSI‐
FADDR ioctl. The le interface employs the address resolution protocol
described in arp(7) to map dynamically between Internet and Ethernet
addresses on the local network.
The SIOCSPHYSADDR ioctl can be used to change the physical address of
the LeMAC. The SIOCRPHYSADDR ioctl can be used to read the physical
address of the LeMAC.
The SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add or delete
multicast addresses. The LeMAC recognizes a maximum of 12 multicast
addresses.
The SIOCRDCTRS and SIOCRDZCTRS ioctls can be used to read or ``read and
clear'' the Ethernet driver counters. The argument to these two ioctls
is a pointer to a counter structure, ctrreq, found in <net/if.h>.
The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to enable and
disable the interface loopback mode respectively.
ERRORS
The diagnostic error messages contain relevant information provided by
the LeMAC. The interface was handed a message with addresses formatted
in an unsuitable address family, and the packet was dropped. The le
driver was unable to allocate memory for internal data structures. The
IRQ for the LeMAC is missing from the CMOS configuration data or is
incorrect. The IRQ for the LeMAC is missing from the CMOS configura‐
tion data or is incorrect. Too many multicast requests have been made.
The shared memory block for the LeMAC's local RAM buffer is missing
from the CMOS configuration data. The station address PROM on the
LeMAC is corrupt or inaccessible. The hardware transmit queue has been
overflowed. An attempt was made to delete the Ethernet broadcast
address of ff-ff-ff-ff-ff.
EXAMPLES
To obtain the physical address of the adapter, use the SIOCRPHYSADDR
ioctl as in the following program example:
#include <stdio.h> /* standard I/O */ #include <errno.h>
/* error numbers */ #include <sys/socket.h> /* socket defini‐
tions */ #include <sys/ioctl.h> /* ioctls */ #include
<net/if.h> /* generic interface structures */
main() {
int s,i;
struct ifdevea devea;
/* Get a socket */
s = socket(AF_INET,SOCK_DGRAM,0);
if (s < 0) {
perror("socket");
exit(1);
}
strcpy(devea.ifr_name,"le0");
if (ioctl(s,SIOCRPHYSADDR,&devea) < 0) {
perror(&devea.ifr_name[0]);
exit(1);
}
printf("Address is ");
for (i = 0; i < 6; i++)
printf("%X ", devea.default_pa[i] & 0xff);
printf("\n");
close(s); }
To enable external loopback, use the SIOCENABLEBACK ioctl as in the
following program example:
#include <stdio.h> /* standard I/O */ #include <errno.h>
/* error numbers */ #include <sys/socket.h> /* socket defini‐
tions */ #include <sys/ioctl.h> /* ioctls */ #include
<net/if.h> /* generic interface structures */
main() {
int s;
struct ifreq data;
/* Get a socket */
s = socket(AF_INET,SOCK_DGRAM,0);
if (s < 0) {
perror("socket");
exit(1);
}
strcpy(data.ifr,"le0");
if (ioctl(s,SIOCENABLEBACK,&data) < 0) {
perror("SIOCENABLEBACK:");
exit(1);
}
close(s); }
SEE ALSOarp(7), inet(7), netintro(7)le(7)