s390/net/ctcm_mpc.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * Copyright IBM Corp. 2007
0004  * Authors: Peter Tiedemann (ptiedem@de.ibm.com)
0005  *
0006  *  MPC additions:
0007  *      Belinda Thompson (belindat@us.ibm.com)
0008  *      Andy Richter (richtera@us.ibm.com)
0009  */
0010
0011 #ifndef _CTC_MPC_H_
0012 #define _CTC_MPC_H_
0013
0014 #include <linux/interrupt.h>
0015 #include <linux/skbuff.h>
0016 #include "fsm.h"
0017
0018 /*
0019  * MPC external interface
0020  * Note that ctc_mpc_xyz are called with a lock on ................
0021  */
0022
0023 /*  port_number is the mpc device 0, 1, 2 etc mpc2 is port_number 2 */
0024
0025 /*  passive open  Just wait for XID2 exchange */
0026 extern int ctc_mpc_alloc_channel(int port,
0027         void (*callback)(int port_num, int max_write_size));
0028 /* active open  Alloc then send XID2 */
0029 extern void ctc_mpc_establish_connectivity(int port,
0030         void (*callback)(int port_num, int rc, int max_write_size));
0031
0032 extern void ctc_mpc_dealloc_ch(int port);
0033 extern void ctc_mpc_flow_control(int port, int flowc);
0034
0035 /*
0036  * other MPC Group prototypes and structures
0037  */
0038
0039 #define ETH_P_SNA_DIX   0x80D5
0040
0041 /*
0042  * Declaration of an XID2
0043  *
0044  */
0045 #define ALLZEROS 0x0000000000000000
0046
0047 #define XID_FM2     0x20
0048 #define XID2_0      0x00
0049 #define XID2_7      0x07
0050 #define XID2_WRITE_SIDE 0x04
0051 #define XID2_READ_SIDE  0x05
0052
0053 struct xid2 {
0054     __u8    xid2_type_id;
0055     __u8    xid2_len;
0056     __u32   xid2_adj_id;
0057     __u8    xid2_rlen;
0058     __u8    xid2_resv1;
0059     __u8    xid2_flag1;
0060     __u8    xid2_fmtt;
0061     __u8    xid2_flag4;
0062     __u16   xid2_resv2;
0063     __u8    xid2_tgnum;
0064     __u32   xid2_sender_id;
0065     __u8    xid2_flag2;
0066     __u8    xid2_option;
0067     char  xid2_resv3[8];
0068     __u16   xid2_resv4;
0069     __u8    xid2_dlc_type;
0070     __u16   xid2_resv5;
0071     __u8    xid2_mpc_flag;
0072     __u8    xid2_resv6;
0073     __u16   xid2_buf_len;
0074     char xid2_buffer[255 - (13 * sizeof(__u8) +
0075                 2 * sizeof(__u32) +
0076                 4 * sizeof(__u16) +
0077                 8 * sizeof(char))];
0078 } __attribute__ ((packed));
0079
0080 #define XID2_LENGTH  (sizeof(struct xid2))
0081
0082 struct th_header {
0083     __u8    th_seg;
0084     __u8    th_ch_flag;
0085 #define TH_HAS_PDU  0xf0
0086 #define TH_IS_XID   0x01
0087 #define TH_SWEEP_REQ    0xfe
0088 #define TH_SWEEP_RESP   0xff
0089     __u8    th_blk_flag;
0090 #define TH_DATA_IS_XID  0x80
0091 #define TH_RETRY    0x40
0092 #define TH_DISCONTACT   0xc0
0093 #define TH_SEG_BLK  0x20
0094 #define TH_LAST_SEG 0x10
0095 #define TH_PDU_PART 0x08
0096     __u8    th_is_xid;  /* is 0x01 if this is XID  */
0097     __u32   th_seq_num;
0098 } __attribute__ ((packed));
0099
0100 struct th_addon {
0101     __u32   th_last_seq;
0102     __u32   th_resvd;
0103 } __attribute__ ((packed));
0104
0105 struct th_sweep {
0106     struct th_header th;
0107     struct th_addon sw;
0108 } __attribute__ ((packed));
0109
0110 #define TH_HEADER_LENGTH (sizeof(struct th_header))
0111 #define TH_SWEEP_LENGTH (sizeof(struct th_sweep))
0112
0113 #define PDU_LAST    0x80
0114 #define PDU_CNTL    0x40
0115 #define PDU_FIRST   0x20
0116
0117 struct pdu {
0118     __u32   pdu_offset;
0119     __u8    pdu_flag;
0120     __u8    pdu_proto;   /*  0x01 is APPN SNA  */
0121     __u16   pdu_seq;
0122 } __attribute__ ((packed));
0123
0124 #define PDU_HEADER_LENGTH  (sizeof(struct pdu))
0125
0126 struct qllc {
0127     __u8    qllc_address;
0128 #define QLLC_REQ    0xFF
0129 #define QLLC_RESP   0x00
0130     __u8    qllc_commands;
0131 #define QLLC_DISCONNECT 0x53
0132 #define QLLC_UNSEQACK   0x73
0133 #define QLLC_SETMODE    0x93
0134 #define QLLC_EXCHID 0xBF
0135 } __attribute__ ((packed));
0136
0137
0138 /*
0139  * Definition of one MPC group
0140  */
0141
0142 #define MAX_MPCGCHAN        10
0143 #define MPC_XID_TIMEOUT_VALUE   10000
0144 #define MPC_CHANNEL_ADD     0
0145 #define MPC_CHANNEL_REMOVE  1
0146 #define MPC_CHANNEL_ATTN    2
0147 #define XSIDE   1
0148 #define YSIDE   0
0149
0150 struct mpcg_info {
0151     struct sk_buff  *skb;
0152     struct channel  *ch;
0153     struct xid2 *xid;
0154     struct th_sweep *sweep;
0155     struct th_header *th;
0156 };
0157
0158 struct mpc_group {
0159     struct tasklet_struct mpc_tasklet;
0160     struct tasklet_struct mpc_tasklet2;
0161     int changed_side;
0162     int saved_state;
0163     int channels_terminating;
0164     int out_of_sequence;
0165     int flow_off_called;
0166     int port_num;
0167     int port_persist;
0168     int alloc_called;
0169     __u32   xid2_adj_id;
0170     __u8    xid2_tgnum;
0171     __u32   xid2_sender_id;
0172     int num_channel_paths;
0173     int active_channels[2];
0174     __u16   group_max_buflen;
0175     int outstanding_xid2;
0176     int outstanding_xid7;
0177     int outstanding_xid7_p2;
0178     int sweep_req_pend_num;
0179     int sweep_rsp_pend_num;
0180     struct sk_buff  *xid_skb;
0181     char        *xid_skb_data;
0182     struct th_header *xid_th;
0183     struct xid2 *xid;
0184     char        *xid_id;
0185     struct th_header *rcvd_xid_th;
0186     struct sk_buff  *rcvd_xid_skb;
0187     char        *rcvd_xid_data;
0188     __u8        in_sweep;
0189     __u8        roll;
0190     struct xid2 *saved_xid2;
0191     void        (*allochanfunc)(int, int);
0192     int     allocchan_callback_retries;
0193     void        (*estconnfunc)(int, int, int);
0194     int     estconn_callback_retries;
0195     int     estconn_called;
0196     int     xidnogood;
0197     int     send_qllc_disc;
0198     fsm_timer   timer;
0199     fsm_instance    *fsm; /* group xid fsm */
0200 };
0201
0202 #ifdef DEBUGDATA
0203 void ctcmpc_dumpit(char *buf, int len);
0204 #else
0205 static inline void ctcmpc_dumpit(char *buf, int len)
0206 {
0207 }
0208 #endif
0209
0210 #ifdef DEBUGDATA
0211 /*
0212  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
0213  *
0214  * skb   The struct sk_buff to dump.
0215  * offset Offset relative to skb-data, where to start the dump.
0216  */
0217 void ctcmpc_dump_skb(struct sk_buff *skb, int offset);
0218 #else
0219 static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
0220 {}
0221 #endif
0222
0223 static inline void ctcmpc_dump32(char *buf, int len)
0224 {
0225     if (len < 32)
0226         ctcmpc_dumpit(buf, len);
0227     else
0228         ctcmpc_dumpit(buf, 32);
0229 }
0230
0231 void ctcm_ccw_check_rc(struct channel *, int, char *);
0232 void mpc_group_ready(unsigned long adev);
0233 void mpc_channel_action(struct channel *ch, int direction, int action);
0234 void mpc_action_send_discontact(unsigned long thischan);
0235 void mpc_action_discontact(fsm_instance *fi, int event, void *arg);
0236 void ctcmpc_bh(unsigned long thischan);
0237 #endif
0238 /* --- This is the END my friend --- */