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 */
26 extern int ctc_mpc_alloc_channel(int port,
27 		void (*callback)(int port_num, int max_write_size));
28 /* active open  Alloc then send XID2 */
29 extern void ctc_mpc_establish_connectivity(int port,
30 		void (*callback)(int port_num, int rc, int max_write_size));
31 
32 extern void ctc_mpc_dealloc_ch(int port);
33 extern 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 
53 struct 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 
82 struct 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 
100 struct th_addon {
101 	__u32	th_last_seq;
102 	__u32	th_resvd;
103 } __attribute__ ((packed));
104 
105 struct 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 
117 struct 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 
126 struct 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 
150 struct 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 
158 struct 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
203 void ctcmpc_dumpit(char *buf, int len);
204 #else
ctcmpc_dumpit(char * buf,int len)205 static 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  */
217 void ctcmpc_dump_skb(struct sk_buff *skb, int offset);
218 #else
ctcmpc_dump_skb(struct sk_buff * skb,int offset)219 static inline void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
220 {}
221 #endif
222 
ctcmpc_dump32(char * buf,int len)223 static 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 
231 int ctcmpc_open(struct net_device *);
232 void ctcm_ccw_check_rc(struct channel *, int, char *);
233 void mpc_group_ready(unsigned long adev);
234 void mpc_channel_action(struct channel *ch, int direction, int action);
235 void mpc_action_send_discontact(unsigned long thischan);
236 void mpc_action_discontact(fsm_instance *fi, int event, void *arg);
237 void ctcmpc_bh(unsigned long thischan);
238 #endif
239 /* --- This is the END my friend --- */
240