11.2.2 LAPB ioctls
The ioctls described in this section can only be used over LAPB.
11.2.2.1 L_GETGSTATS--Reads Global Layer 2 Statistics
The L_GETGSTATS ioctl reads global layer 2 statistics from the LAPB driver.
Associated Structures
The lapb_gstioc structure is used.
/* Ioctl block for L_GETGSTATS ioctl */
struct lapb_gstioc {
uint8 lli_type; /* Table type = LI_GSTATS */
uint8 lli_spare[3]; /* (for alignment) */
uint32 lapbgstats[globstatmax];
/* global statistics table */
};
/* Global L2 statistics */
#define frames_tx 0 /* frames transmitted */
#define frames_rx 1 /* frames received */
#define sabme_tx 2 /* SABMEs transmitted */
#define sabme_rx 3 /* SABMEs received */
#define bytes_tx 4 /* data bytes transmitted */
#define bytes_rx 5 /* data bytes received */
#define globstatmax 6 /* size of global stats array */
The members of the lapb_gstioc structure are:
Table 11-43 Members of the lapb_gstioc structure|
Member |
Description |
|---|---|
|
lli_type |
The table type |
|
lapbgstats |
The global statistics table |
11.2.2.2 L_GETPPA--Returns the PPA Associated With a Stream
This ioctl returns the PPA and link index associated with the stream.
Associated Structure:
/* Ioctl block for L_SETPPA and L_GETPPA commands */
struct ll_snioc {
uint8 lli_type; /* Table type = LI_SPPA */
uint8 lli_class; /* DTE/DCE/extended */
uint16 lli_slp_pri; /* SLP priority */
uint32 lli_ppa; /* PPA/ Subnetwork ID character */
uint32 lli_index; /* Link index */
};
The members of the ll_snioc structure are:
Table 11-44 Members of the ll_snioc structure|
Member |
Description |
|---|---|
|
lli_type |
The table type. This should always be LI_SPPA. |
|
lli_class |
This indicates the type of link. LC_LLC2 must be used for LLC2; LC__LAPBDTE or LC_LAPBDCE must be used for LAPB. The file /usr/include/netdlc/ll_proto.h contains a complete list of values. |
|
lli_slp_pri |
This determines the priority of SLP when MLP is used. |
|
lli_ppa |
The PPA identifier |
|
lli_index |
The link index. This must be set with the muxid value returned by the I-LINK ioctl when LAPB is placed over a serial driver. |
Errors
Table 11-45 L_GETPPA errors|
Error |
Description |
|---|---|
|
ENODEV |
No such device or a DL_ATTACH_REQ has not been sent. |
11.2.2.3 L_GETSTATS--Retrieves Per-Link Statistics
The L_GETSTATS ioctl reads per-link (i.e., per-PPA) statistics from the LAPB driver.
Associated Structures
The lapb_stioc structure is used
/* Ioctl block for L_GETSTATS ioctl */
struct lapb_stioc {
uint8 lli_type; /* Table type = LI_STATS */
uint8 lli_spare[3]; /* (for alignment) */
uint32 lli_ppa; /* PPA */
lapbstats_t lli_stats; /* Table of stats values */
};
The lapbstats_t structure needed for L_GETSTATS is defined as follows:
Example 11-1 lapbstats_t structure
typedef struct lapb2_stats {
uint32 lapbmonarray[laphstatmax]; /* array of LAPB stats */
} lapbstats_t;
/* Statistics table definitions */
#define tx_ign 0 /* no. ignored + not sent */
#define rx_badlen 1 /* bad length frames received */
#define rx_unknown 2 /* unknown frames received */
#define t1_exp 3 /* no. of T1 timeouts */
#define t4_exp 4 /* no. of T4 timeouts */
#define t4_n2_exp 5 /* T4 timeouts after N2 times */
#define RR_rx_cmd 6 /* RR = Receive Ready */
#define RR_rx_rsp 7 /* tx = transmitted */
#define RR_tx_cmd 8 /* rx = received */
#define RR_tx_rsp 9 /* cmd/rsp = command/response */
#define RR_tx_cmd_p 10 /* p = p-bit set */
#define RNR_rx_cmd 11 /* RNR = Receive Not Ready */
#define RNR_rx_rsp 12
#define RNR_tx_cmd 13
#define RNR_tx_rsp 14
#define RNR_tx_cmd_p 15
#define REJ_rx_cmd 16 /* REJ = Reject */
#define REJ_rx_rsp 17
#define REJ_tx_cmd 18
#define REJ_tx_rsp 19
#define REJ_tx_cmd_p 20
#define SABME_rx_cmd 21 /* SABME = Set Asynchronous */
#define SABME_tx_cmd 22 /* Balanced Mode Extended */
#define DISC_rx_cmd 23 /* DISC = Disconnect */
#define DISC_tx_cmd 24
#define UA_rx_rsp 25 /* UA = Unnumbered */
#define UA_tx_rsp 26 /* Acknowledgment */
#define DM_rx_rsp 27 /* */
#define DM_tx_rsp 28
#define I_rx_cmd 29 /* I = Information */
#define I_tx_cmd 30
#define FRMR_rx_rsp 31 /* FRMR = Frame Reject */
#define FRMR_tx_rsp 32
#define tx_rtr 33 /* no. of retransmitted frames */
#define rx_bad 34 /* erroneous frames received */
#define rx_dud 35 /* received and discarded */
#define rx_ign 36 /* received and ignored */
#define I_rx_rsp 37
#define I_tx_rsp 38
#define UI_rx_cmd 39
#define UI_tx_cmd 40
#define XID_rx_cmd 41
#define XID_rx_rsp 42
#define XID_tx_cmd 43
#define XID_tx_rsp 44
#define TEST_rx_cmd 45
#define TEST_rx_rsp 46
#define TEST_tx_cmd 47
#define TEST_tx_rsp 48
#define llc2statmax 40
11.2.2.4 L_SETPPA--Associates a PPA With a Physical Device
This ioctl associates a PPA with a physical device underneath the layer two provider.
Associated Structure:
/* Ioctl block for L_SETPPA and L_GETPPA commands */
struct ll_snioc {
uint8 lli_type; /* Table type = LI_SPPA */
uint8 lli_class; /* DTE/DCE/extended */
uint16 lli_slp_pri; /* SLP priority */
uint32 lli_ppa; /* PPA/ Subnetwork ID character */
uint32 lli_index; /* Link index */
};
The members are:
Table 11-46 Members of the ll_snioc structure|
Member |
Description |
|---|---|
|
lli_type |
The table type. This should always be LI_SPPA. |
|
lli_class |
This indicates the type of link. LC_LAPBDTE or LC_LAPBDCE must be used for LAPB. The file /usr/include/netdlc/ll_proto.h contains a complete list of values. |
|
lli_slp_pri |
This determines the priority of SLP when MLP is used. |
|
lli_ppa |
The PPA identifier |
|
lli_index |
The link index. This must be set with the muxid value returned by the I-LINK ioctl when LAPB is placed over a serial driver. |
Errors
Table 11-47 L_SETPPA errors|
Error |
Description |
|---|---|
|
EBUSY |
The PPA is already being used by another stream. |
|
ENODEV |
The specified lli_index has not been found. |
11.2.2.5 L_ZEROSTATS--Clears the Per-Link Statistics Count
The L_ZEROSTATS ioctl clears per-link statistics in the LLC2 and LAPB drivers.
Associated Structure
/* Ioctl block for L_ZEROSTATS ioctl */
struct ll_hdioc {
uint8 lli_type; /* Table type = LI_PLAIN */
uint8 lli_spare[3]; /* (for alignment) */
uint32 lli_ppa; /* PPA (0xff for all links) */
};
11.2.2.6 W_SETTUNE--Sets wanmod Tunable Parameters
The W_SETTUNE ioctl sets the tunable parameters of the LAPB wanmod module. This controls physical parameters such as the maximum frame length and line speed.
Associated Structure
The following is from the file /usr/include/netx25/wan_control.h.
/* Ioctl block for WAN W_SETTUNE command
*/
struct wan_tnioc {
uint8 w_type; /* Always = WAN_TUNE */
uint8 w_spare[3]; /* (for alignment) */
uint32 w_snid; /* subnetwork id character ('*' => 'all') */
wantune_t wan_tune; /* Table of tuning values
*/
};
/* WAN tuning structure */
typedef struct wantune {
uint16 WAN_options; /* WAN options */
struct WAN_hddef WAN_hd; /* HD information. */
} wantune_t;
/*
This is the structure which contains all tuneable information
*/
struct WAN_hddef {
uint16 WAN_maxframe; /* WAN maximum frame size */
int WAN_baud; /* WAN baud rate */
uint16 WAN_interface ; /* WAN physical interface */
}
union {
uint16 WAN_cptype; /* Variant type */
struct WAN_x21 WAN_x21def;
struct WAN_v25 WAN_v25def;
} WAN_cpdef ; /* WAN call procedural definition * * for hardware interface. */
};
/*
This contains all of the national network specific timeouts.
*/
struct WAN_v25 {
uint16 WAN_cptype; /* Variant type. */
uint16 callreq; /* Abort time for call request command * * if network does not support CFI. */
};
The members of the wan_tnioc structure are:
Table 11-48 Members of the wan_tnioc structure|
Member |
Description |
|---|---|
|
w_snid |
The link id. It should be set to the same value as lli_ppa in the L_SETPPA L_SETTUNE ioctls. |
|
WAN_options |
Reserved for future use. Must be set to 0. |
|
WAN_maxframe |
The maximum frame size to be used on this interface (unit is octet). |
|
WAN_baud |
The speed of the line (unit is baud, 0 is used for external clocking). |
|
WAN_interface |
The type of interface. Should always be set to WAN_V28 |
|
WAN_cptype |
The type of interface. Set this to WAN_NONE if no calling procedures are used (the most frequent case), or to WAN_V25bis if a calling procedure and V25bis modem are used. In this instance, the WAN_v25 structure must be filled. |
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