mfa man page on OSF1

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mfa(7)									mfa(7)

NAME
       mfa - DEMFA FDDI Network Interface

SYNOPSIS
       config_driver mfa

DESCRIPTION
       The  mfa	 interface  is	a  high speed XMI adapter to a 100 Mbit/second
       Fiber Distributed  Data	Interface  (FDDI)  timed  token	 ring  network
       adapter.	 The mfa interface allows the host system to be an FDDI single
       attachment station.

       The host's Internet address is specified at boot time with  an  SIOCSI‐
       FADDR ioctl.  The mfa interface employs the address resolution protocol
       described in arp(7)  to	map  dynamically  between  Internet  and  FDDI
       addresses on the local network.

       The  maximum  frame  size for the mfa interface is 4500 bytes, which is
       substantially larger that the 1500 bytes maximum	 packet	 size  of  the
       Ethernet interfaces. The mfa interface does not support the BSD trailer
       encapsulation, which is specific to the VAX architecture.

       The SIOCRPHYSADDR ioctl can be used to read the physical address of the
       DEMFA adapter. The physical address of the DEMFA adapter can be changed
       by use of the SIOCSPHYSADDR ioctl.

       The SIOCADDMULTI and SIOCDELMULTI ioctls can be used to add  or	delete
       multicast addresses. The DEMFA supports up to 15 multicast addresses.

       The SIOCRDCTRS ioctl can be used to read the FDDI driver counters.  The
       DEMFA adapter status and characteristics can also be read through  this
       ioctl  by providing a FDDISTATUS flag . The argument to this ioctl is a
       pointer to a counter or status structure, ctrreq, found in <net/if.h>.

       The SIOCENABLBACK and SIOCDISABLBACK ioctls can be used to  enable  and
       disable the interface loopback mode, respectively.

       The SIOCIFRESET ioctl can be used to reset the adapter.

ERRORS
       Diagnostic  error  messages  contain  information  provided  by the mfa
       driver. For example: The DEMFA adapter did not pass the power-up	 self‐
       test  during autoconfiguration.	The DEMFA is unable to allocate system
       memory or cluster mbufs for device initialization.   The	 DEMFA	cannot
       transition  to  the  initialized state.	An interrupt has been received
       with no packets found.  An internal command to the device has failed to
       complete	 on  time.   An internal command to the device has returned an
       error.  The DEMFA has received an unknown type of unsolicited interrupt
       about  the  FDDI	 ring  state.	The  DEMFA has received an unsolicited
       interrupt, the FDDI ring state has been changed.	 The DEMFA was	unable
       to change FDDI characteristics and restart.  An attempt was made to add
       more than 15 multicast addresses to the device.	The DEMFA  has	failed
       internal	 self  test during a reset operation.  The DEMFA has failed to
       re-initialize after a reset operation.  The  DEMFA  has	encountered  a
       hard error which should cause the device to reset.

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;
	 static	  struct  ifdevea  devea;
	 /* Get a socket */
	 s = socket(AF_INET,SOCK_DGRAM,0);
	 if (s < 0) {
	    perror("socket");
	    exit(1);
	 }
	 strcpy(devea.ifr_name,"mfa0");
	 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  reset  the  adapter,	 use the SIOCIFRESET 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_name,"mfa0");
	 if (ioctl(s,SIOCIFRESET,&data) < 0) {
	    perror("SIOCIFRESET:");
	    exit(1);
	 }
	 close(s); }

SEE ALSO
       netstat(1), arp(7), inet(7), intro(7), fddi_config(8)

									mfa(7)
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