ctcm_mpc.h

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/*
 * Copyright IBM Corp. 2007
 * Authors: Peter Tiedemann ([email protected])
 *
 *  MPC additions:
 *      Belinda Thompson ([email protected])
 *      Andy Richter ([email protected])
 */

#ifndef _CTC_MPC_H_
#define _CTC_MPC_H_

#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include "fsm.h"

/*
 * MPC external interface
 * Note that ctc_mpc_xyz are called with a lock on ................
 */

/*  port_number is the mpc device 0, 1, 2 etc mpc2 is port_number 2 */

/*  passive open  Just wait for XID2 exchange */
extern int ctc_mpc_alloc_channel(int port,
        void (*callback)(int port_num, int max_write_size));
/* active open  Alloc then send XID2 */
extern void ctc_mpc_establish_connectivity(int port,
        void (*callback)(int port_num, int rc, int max_write_size));

extern void ctc_mpc_dealloc_ch(int port);
extern void ctc_mpc_flow_control(int port, int flowc);

/*
 * other MPC Group prototypes and structures
 */

#define ETH_P_SNA_DIX   0x80D5

/*
 * Declaration of an XID2
 *
 */
#define ALLZEROS 0x0000000000000000

#define XID_FM2     0x20
#define XID2_0      0x00
#define XID2_7      0x07
#define XID2_WRITE_SIDE 0x04
#define XID2_READ_SIDE  0x05

struct xid2 {
    __u8    xid2_type_id;
    __u8    xid2_len;
    __u32   xid2_adj_id;
    __u8    xid2_rlen;
    __u8    xid2_resv1;
    __u8    xid2_flag1;
    __u8    xid2_fmtt;
    __u8    xid2_flag4;
    __u16   xid2_resv2;
    __u8    xid2_tgnum;
    __u32   xid2_sender_id;
    __u8    xid2_flag2;
    __u8    xid2_option;
    char  xid2_resv3[8];
    __u16   xid2_resv4;
    __u8    xid2_dlc_type;
    __u16   xid2_resv5;
    __u8    xid2_mpc_flag;
    __u8    xid2_resv6;
    __u16   xid2_buf_len;
    char xid2_buffer[255 - (13 * sizeof(__u8) +
                2 * sizeof(__u32) +
                4 * sizeof(__u16) +
                8 * sizeof(char))];
} __attribute__ ((packed));

#define XID2_LENGTH  (sizeof(struct xid2))

struct th_header {
    __u8    th_seg;
    __u8    th_ch_flag;
#define TH_HAS_PDU  0xf0
#define TH_IS_XID   0x01
#define TH_SWEEP_REQ    0xfe
#define TH_SWEEP_RESP   0xff
    __u8    th_blk_flag;
#define TH_DATA_IS_XID  0x80
#define TH_RETRY    0x40
#define TH_DISCONTACT   0xc0
#define TH_SEG_BLK  0x20
#define TH_LAST_SEG 0x10
#define TH_PDU_PART 0x08
    __u8    th_is_xid;  /* is 0x01 if this is XID  */
    __u32   th_seq_num;
} __attribute__ ((packed));

struct th_addon {
    __u32   th_last_seq;
    __u32   th_resvd;
} __attribute__ ((packed));

struct th_sweep {
    struct th_header th;
    struct th_addon sw;
} __attribute__ ((packed));

#define TH_HEADER_LENGTH (sizeof(struct th_header))
#define TH_SWEEP_LENGTH (sizeof(struct th_sweep))

#define PDU_LAST    0x80
#define PDU_CNTL    0x40
#define PDU_FIRST   0x20

struct pdu {
    __u32   pdu_offset;
    __u8    pdu_flag;
    __u8    pdu_proto;   /*  0x01 is APPN SNA  */
    __u16   pdu_seq;
} __attribute__ ((packed));

#define PDU_HEADER_LENGTH  (sizeof(struct pdu))

struct qllc {
    __u8    qllc_address;
#define QLLC_REQ    0xFF
#define QLLC_RESP   0x00
    __u8    qllc_commands;
#define QLLC_DISCONNECT 0x53
#define QLLC_UNSEQACK   0x73
#define QLLC_SETMODE    0x93
#define QLLC_EXCHID 0xBF
} __attribute__ ((packed));


/*
 * Definition of one MPC group
 */

#define MAX_MPCGCHAN        10
#define MPC_XID_TIMEOUT_VALUE   10000
#define MPC_CHANNEL_ADD     0
#define MPC_CHANNEL_REMOVE  1
#define MPC_CHANNEL_ATTN    2
#define XSIDE   1
#define YSIDE   0

struct mpcg_info {
    struct sk_buff  *skb;
    struct channel  *ch;
    struct xid2 *xid;
    struct th_sweep *sweep;
    struct th_header *th;
};

struct mpc_group {
    struct tasklet_struct mpc_tasklet;
    struct tasklet_struct mpc_tasklet2;
    int changed_side;
    int saved_state;
    int channels_terminating;
    int out_of_sequence;
    int flow_off_called;
    int port_num;
    int port_persist;
    int alloc_called;
    __u32   xid2_adj_id;
    __u8    xid2_tgnum;
    __u32   xid2_sender_id;
    int num_channel_paths;
    int active_channels[2];
    __u16   group_max_buflen;
    int outstanding_xid2;
    int outstanding_xid7;
    int outstanding_xid7_p2;
    int sweep_req_pend_num;
    int sweep_rsp_pend_num;
    struct sk_buff  *xid_skb;
    char        *xid_skb_data;
    struct th_header *xid_th;
    struct xid2 *xid;
    char        *xid_id;
    struct th_header *rcvd_xid_th;
    struct sk_buff  *rcvd_xid_skb;
    char        *rcvd_xid_data;
    __u8        in_sweep;
    __u8        roll;
    struct xid2 *saved_xid2;
    void        (*allochanfunc)(int, int);
    int     allocchan_callback_retries;
    void        (*estconnfunc)(int, int, int);
    int     estconn_callback_retries;
    int     estconn_called;
    int     xidnogood;
    int     send_qllc_disc;
    fsm_timer   timer;
    fsm_instance    *fsm; /* group xid fsm */
};

#ifdef DEBUGDATA
void ctcmpc_dumpit(char *buf, int len);
#else
static inline void ctcmpc_dumpit(char *buf, int len)
{
}
#endif

#ifdef DEBUGDATA
/*
 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 *
 * skb   The struct sk_buff to dump.
 * offset Offset relative to skb-data, where to start the dump.
 */
void ctcmpc_dump_skb(struct sk_buff *skb, int offset);
#else
static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
{}
#endif

static inline void ctcmpc_dump32(char *buf, int len)
{
    if (len < 32)
        ctcmpc_dumpit(buf, len);
    else
        ctcmpc_dumpit(buf, 32);
}

int ctcmpc_open(struct net_device *);
void ctcm_ccw_check_rc(struct channel *, int, char *);
void mpc_group_ready(unsigned long adev);
void mpc_channel_action(struct channel *ch, int direction, int action);
void mpc_action_send_discontact(unsigned long thischan);
void mpc_action_discontact(fsm_instance *fi, int event, void *arg);
void ctcmpc_bh(unsigned long thischan);
#endif
/* --- This is the END my friend --- */