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sys_attrs_lfa(5)					     sys_attrs_lfa(5)



NAME

  sys_attrs_lfa	- lfa subsystem	attributes

DESCRIPTION

  This reference page lists and	describes attributes for the lfa (lfa) kernel
  subsystem. This subsystem is used by the Compaq HE622	and HE155 Asynchro-
  nous Transfer	Mode (ATM) adapters.

  Refer	to the sys_attrs(5) reference page for an introduction to the topic
  of kernel subsystem attributes.



  driver_version
      The version number of the	lfa driver. This is a read-only	attribute,
      and cannot be changed.



  minimal_isr
      A	value that enables (1) or disables (0) the awakening of	a separate
      thread to	handle real interrupt service work by the interrupt service
      routine.

      Do not modify the	default	setting	for this attribute unless instructed
      to do so by Compaq Computer Corporation support personnel	or by patch
      kit documentation.

      Default value: 1 (enabled)



  num_mac_addresses
      The number of Media Access Control (MAC) addresses to generate for the
      lfa adapter. The adapter has only	one MAC	address, but the driver	can
      generate unique locally administered addresses up	to the number speci-
      fied.

      Default value: 16	(addresses)

      Minimum value: 1

      Maximum value: 64



  num_vpi_bits
      The number of bits to use	for the	Virtual	Path Identifier	(VPI) field.
      A	total of 12 bits can be	divided	between	the VPI	and VCI	(Virtual
      Channel Identifier) fields.

      The mapping of the valid num_vpi_bits values to the different VPI	and
      VCI ranges are as	follows:





      _____________________________
      Value   VPI Range	  VCI Range
      _____________________________
      0	      0		  0-4095
      1	      0-1	  0-2047
      2	      0-3	  0-1023
      3	      0-7	  0-511
      4	      0-15	  0-255
      5	      0-31	  0-127
      6	      0-63	  0-63
      7	      0-127	  0-31
      8	      0-255	  0-15
      _____________________________

      Default value: 0 (bits), or 12 bits for the VCI

      Minimum value: 0

      Maximum Value: 8



  use_64bit
      A	value that enables (1) or disables (0) the use of 64-bit data
      transfers	by the adapter.	 When installed	in a 64-bit PCI	slot, the
      Compaq HE622 and HE155 adapters can perform 64-bit data transfers. To
      force the	driver to use 32-bit data transfers, set this attribute	to 0.

      Do not modify the	default	setting	for this attribute unless instructed
      to do so by Compaq Computer Corporation support personnel	or by patch
      kit documentation.

      Default value: 0 (disabled)

SEE ALSO

  sys_attrs(5)

  Asynchronous Transfer	Mode