DLC_ALTER

This sections explains the ioctl subroutine argument structure for altering an LS.

The ioctl subroutine argument structure for altering an LS (dlc_alter_arg) has the following specifics:

• The following alter flags are not supported:

  Item	Description
  SM1, SM2	Sets SDLC control mode.

• A protocol-specific data area must be appended to the generic alter link station argument structure (dlc_alter_arg). This structure provides DLCTOKEN with additional protocol-specific alter parameters.

  
  #define TRL_ALTER_PRTY 0x80000000 /* alter packet priority     */
  #define TRL_ALTER_DYNA 0x40000000 /* alter dynamic window incr.*/
     struct trl_start_psd
  {
     ulong_t   flags;      /* specific alter flags               */
     uchar_t   pkt_prty;   /* ring access packet priority value  */
     uchar_t   dyna_wnd;   /* dynamic window increment value     */
     ushort_t  reserved;   /* currently not used                 */
  };
  

  
  #define TRL_ALTER_PRTY 0x80000000 /* alter packet priority     */
  #define TRL_ALTER_DYNA 0x40000000 /* alter dynamic window incr.*/
     struct trl_start_psd
  {
     __ulong32_t   flags;      /* specific alter flags               */
     uchar_t       pkt_prty;   /* ring access packet priority value  */
     uchar_t       dyna_wnd;   /* dynamic window increment value     */
     ushort_t      reserved;   /* currently not used                 */
  };
  

  Specific alter flags are as follows:

  Item	Description
  TRL_ALTER_PRTY	Specifies alter priority. If this flag is set to 1, the pkt_prty value field replaces the current priority value being used by the LS. The LS must be started for this alter command to be valid.
  TRL_ALTER_DYNA	Specifies alter dynamic window. If this flag is set to 1, the dyna_wnd value field replaces the current dynamic window value being used by the LS. The LS must be started for this alter command to be valid.

  The protocol-specific parameters are as follows:

  Item	Description
  pkt_prty	Specifies the new priority reservation value for transmit packets.
  dyna_wnd	Specifies the new dynamic window value to control network congestion.