1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2007
4 * Authors:	Peter Tiedemann (ptiedem@de.ibm.com)
5 *
6 * 	MPC additions:
7 *		Belinda Thompson (belindat@us.ibm.com)
8 *		Andy Richter (richtera@us.ibm.com)
9 */
10
11#ifndef _CTC_MPC_H_
12#define _CTC_MPC_H_
13
14#include <linux/interrupt.h>
15#include <linux/skbuff.h>
16#include "fsm.h"
17
18/*
19 * MPC external interface
20 * Note that ctc_mpc_xyz are called with a lock on ................
21 */
22
23/*  port_number is the mpc device 0, 1, 2 etc mpc2 is port_number 2 */
24
25/*  passive open  Just wait for XID2 exchange */
26extern int ctc_mpc_alloc_channel(int port,
27		void (*callback)(int port_num, int max_write_size));
28/* active open  Alloc then send XID2 */
29extern void ctc_mpc_establish_connectivity(int port,
30		void (*callback)(int port_num, int rc, int max_write_size));
31
32extern void ctc_mpc_dealloc_ch(int port);
33extern void ctc_mpc_flow_control(int port, int flowc);
34
35/*
36 * other MPC Group prototypes and structures
37 */
38
39#define ETH_P_SNA_DIX	0x80D5
40
41/*
42 * Declaration of an XID2
43 *
44 */
45#define ALLZEROS 0x0000000000000000
46
47#define XID_FM2		0x20
48#define XID2_0		0x00
49#define XID2_7		0x07
50#define XID2_WRITE_SIDE 0x04
51#define XID2_READ_SIDE	0x05
52
53struct xid2 {
54	__u8	xid2_type_id;
55	__u8	xid2_len;
56	__u32	xid2_adj_id;
57	__u8	xid2_rlen;
58	__u8	xid2_resv1;
59	__u8	xid2_flag1;
60	__u8	xid2_fmtt;
61	__u8	xid2_flag4;
62	__u16	xid2_resv2;
63	__u8	xid2_tgnum;
64	__u32	xid2_sender_id;
65	__u8	xid2_flag2;
66	__u8	xid2_option;
67	char  xid2_resv3[8];
68	__u16	xid2_resv4;
69	__u8	xid2_dlc_type;
70	__u16	xid2_resv5;
71	__u8	xid2_mpc_flag;
72	__u8	xid2_resv6;
73	__u16	xid2_buf_len;
74	char xid2_buffer[255 - (13 * sizeof(__u8) +
75				2 * sizeof(__u32) +
76				4 * sizeof(__u16) +
77				8 * sizeof(char))];
78} __attribute__ ((packed));
79
80#define XID2_LENGTH  (sizeof(struct xid2))
81
82struct th_header {
83	__u8	th_seg;
84	__u8	th_ch_flag;
85#define TH_HAS_PDU	0xf0
86#define TH_IS_XID	0x01
87#define TH_SWEEP_REQ	0xfe
88#define TH_SWEEP_RESP	0xff
89	__u8	th_blk_flag;
90#define TH_DATA_IS_XID	0x80
91#define TH_RETRY	0x40
92#define TH_DISCONTACT	0xc0
93#define TH_SEG_BLK	0x20
94#define TH_LAST_SEG	0x10
95#define TH_PDU_PART	0x08
96	__u8	th_is_xid;	/* is 0x01 if this is XID  */
97	__u32	th_seq_num;
98} __attribute__ ((packed));
99
100struct th_addon {
101	__u32	th_last_seq;
102	__u32	th_resvd;
103} __attribute__ ((packed));
104
105struct th_sweep {
106	struct th_header th;
107	struct th_addon sw;
108} __attribute__ ((packed));
109
110#define TH_HEADER_LENGTH (sizeof(struct th_header))
111#define TH_SWEEP_LENGTH (sizeof(struct th_sweep))
112
113#define PDU_LAST	0x80
114#define PDU_CNTL	0x40
115#define PDU_FIRST	0x20
116
117struct pdu {
118	__u32	pdu_offset;
119	__u8	pdu_flag;
120	__u8	pdu_proto;   /*  0x01 is APPN SNA  */
121	__u16	pdu_seq;
122} __attribute__ ((packed));
123
124#define PDU_HEADER_LENGTH  (sizeof(struct pdu))
125
126struct qllc {
127	__u8	qllc_address;
128#define QLLC_REQ	0xFF
129#define QLLC_RESP	0x00
130	__u8	qllc_commands;
131#define QLLC_DISCONNECT 0x53
132#define QLLC_UNSEQACK	0x73
133#define QLLC_SETMODE	0x93
134#define QLLC_EXCHID	0xBF
135} __attribute__ ((packed));
136
137
138/*
139 * Definition of one MPC group
140 */
141
142#define MAX_MPCGCHAN		10
143#define MPC_XID_TIMEOUT_VALUE	10000
144#define MPC_CHANNEL_ADD		0
145#define MPC_CHANNEL_REMOVE	1
146#define MPC_CHANNEL_ATTN	2
147#define XSIDE	1
148#define YSIDE	0
149
150struct mpcg_info {
151	struct sk_buff	*skb;
152	struct channel	*ch;
153	struct xid2	*xid;
154	struct th_sweep	*sweep;
155	struct th_header *th;
156};
157
158struct mpc_group {
159	struct tasklet_struct mpc_tasklet;
160	struct tasklet_struct mpc_tasklet2;
161	int	changed_side;
162	int	saved_state;
163	int	channels_terminating;
164	int	out_of_sequence;
165	int	flow_off_called;
166	int	port_num;
167	int	port_persist;
168	int	alloc_called;
169	__u32	xid2_adj_id;
170	__u8	xid2_tgnum;
171	__u32	xid2_sender_id;
172	int	num_channel_paths;
173	int	active_channels[2];
174	__u16	group_max_buflen;
175	int	outstanding_xid2;
176	int	outstanding_xid7;
177	int	outstanding_xid7_p2;
178	int	sweep_req_pend_num;
179	int	sweep_rsp_pend_num;
180	struct sk_buff	*xid_skb;
181	char		*xid_skb_data;
182	struct th_header *xid_th;
183	struct xid2	*xid;
184	char		*xid_id;
185	struct th_header *rcvd_xid_th;
186	struct sk_buff	*rcvd_xid_skb;
187	char		*rcvd_xid_data;
188	__u8		in_sweep;
189	__u8		roll;
190	struct xid2	*saved_xid2;
191	void 		(*allochanfunc)(int, int);
192	int		allocchan_callback_retries;
193	void 		(*estconnfunc)(int, int, int);
194	int		estconn_callback_retries;
195	int		estconn_called;
196	int		xidnogood;
197	int		send_qllc_disc;
198	fsm_timer	timer;
199	fsm_instance	*fsm; /* group xid fsm */
200};
201
202#ifdef DEBUGDATA
203void ctcmpc_dumpit(char *buf, int len);
204#else
205static inline void ctcmpc_dumpit(char *buf, int len)
206{
207}
208#endif
209
210#ifdef DEBUGDATA
211/*
212 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
213 *
214 * skb	 The struct sk_buff to dump.
215 * offset Offset relative to skb-data, where to start the dump.
216 */
217void ctcmpc_dump_skb(struct sk_buff *skb, int offset);
218#else
219static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
220{}
221#endif
222
223static inline void ctcmpc_dump32(char *buf, int len)
224{
225	if (len < 32)
226		ctcmpc_dumpit(buf, len);
227	else
228		ctcmpc_dumpit(buf, 32);
229}
230
231void ctcm_ccw_check_rc(struct channel *, int, char *);
232void mpc_group_ready(unsigned long adev);
233void mpc_channel_action(struct channel *ch, int direction, int action);
234void mpc_action_send_discontact(unsigned long thischan);
235void mpc_action_discontact(fsm_instance *fi, int event, void *arg);
236void ctcmpc_bh(unsigned long thischan);
237#endif
238/* --- This is the END my friend --- */
239