The L_SETTUNE ioctl sets tunable parameters in the LLC2 and LAPB drivers for a given PPA.
LLCS uses the llc2_tnioc structure
/* Ioctl block for LLC2 L_SETTUNE command */ struct llc2_tnioc { u_char lli_type; /* Table type = LI_LLC2TUNE */ u_char lli_spare[3]; /* (for alignment) */ u_int lli_ppa; /* PPA (0xff for all PPAs) */ llc2tune_t llc2_tune; /* Table of tuning values */ }; /* LLC2 tuning structure */ typedef struct llc2tune { u_short N2; /* Maximum number of retries */ u_short T1; /* Acknowledgment time (unit 0.1 sec) */ u_short Tpf; /* P/F cycle retry time (unit 0.1 sec) */ u_short Trej; /* Reject retry time (unit 0.1 sec) */ u_short Tbusy; /* Remote busy check time (unit 0.1 sec) */ u_short Tidle; /* Idle P/F cycle time (unit 0.1 sec) */ u_short ack_delay; /* RR delay time (unit 0.1 sec) */ u_short notack_max; /* Maximum number of unack'ed Rx I-frames */ u_short tx_window; /* Transmit window (if no XID received) */ u_short tx_probe; /* P-bit position before end of Tx window */ u_short max_I_len; /* Maximum I-frame length */ u_short xid_window; /* XID window size (receive window) */ u_short xid_Ndup; /* Duplicate MAC XID count (0 => no test) */ u_short xid_Tdup; /* Duplicate MAC XID time (unit 0.1 sec) */ } llc2tune_t;
The members of the llc2_tnoic structure are:
Table 11-41 Members of the llc2_tnoic structure
Member |
Description |
---|---|
lli_type |
The table type |
lli_ppa |
The PPA |
llc2_tune |
A table of tuning values |
LAPB uses the lapb_tnioc structure
/* Ioctl block for LAPB L_SETTUNE command */ struct lapb_tnioc { u_char lli_type; /* Table type = LI_LLAPBTUNE */ u_char lli_spare[3]; /* (for alignment) */ u_int lli_ppa; /* PPA (0xff for all PPAs) */ lapbtune_t lapb_tune;/* Table of tuning values */ }; /* LAPB tuning structure */ typedef struct lapb_tune { uint16 N2; /* Maximum number of retries */ uint16 T1; /* Acknowledgment time (unit 0.1 sec) */ uint16 Tpf; /* P/F cycle retry time (unit 0.1 sec) */ uint16 Trej; /* Reject retry time (unit 0.1 sec) */ uint16 Tbusy; /* Remote busy check time (unit 0.1 sec) */ uint16 Tidle; /* Idle P/F cycle time (unit 0.1 sec) */ uint16 ack_delay; /* RR delay time (unit 0.1 sec) */ uint16 notack_max; /* Maximum number of unack'ed Rx I-frames */ uint16 tx_window; /* Transmit window size */ uint16 tx_probe; /* P-bit position before end of Tx window */ uint16 max_I_len; /* Maximum I-frame length */ uint16 llconform; /* LAPB conformance */ } lapbtune_t;
The members of the lapb_tnoic structure are:
Table 11-42 Members of the lapb_tnoic structure
Member |
Description |
---|---|
lli_type |
The table type |
lli_ppa |
The PPA |
lapb_tune |
A table of tuning values |