1 /*
2 * CTC / ESCON network driver
3 *
4 * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
6 Peter Tiedemann (ptiedem@de.ibm.com)
7 *
8 *
9 * Documentation used:
10 * - Principles of Operation (IBM doc#: SA22-7201-06)
11 * - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02)
12 * - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535)
13 * - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00)
14 * - ESCON I/O Interface (IBM doc#: SA22-7202-029
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2, or (at your option)
19 * any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 */
31
32 #ifndef _CTCMAIN_H_
33 #define _CTCMAIN_H_
34
35 #include <asm/ccwdev.h>
36 #include <asm/ccwgroup.h>
37
38 #include <linux/skbuff.h>
39 #include <linux/netdevice.h>
40
41 #include "fsm.h"
42 #include "cu3088.h"
43
44
45 /**
46 * CCW commands, used in this driver.
47 */
48 #define CCW_CMD_WRITE 0x01
49 #define CCW_CMD_READ 0x02
50 #define CCW_CMD_SET_EXTENDED 0xc3
51 #define CCW_CMD_PREPARE 0xe3
52
53 #define CTC_PROTO_S390 0
54 #define CTC_PROTO_LINUX 1
55 #define CTC_PROTO_OS390 3
56
57 #define CTC_BUFSIZE_LIMIT 65535
58 #define CTC_BUFSIZE_DEFAULT 32768
59
60 #define CTC_TIMEOUT_5SEC 5000
61
62 #define CTC_INITIAL_BLOCKLEN 2
63
64 #define READ 0
65 #define WRITE 1
66
67 #define CTC_ID_SIZE BUS_ID_SIZE+3
68
69
70 struct ctc_profile {
71 unsigned long maxmulti;
72 unsigned long maxcqueue;
73 unsigned long doios_single;
74 unsigned long doios_multi;
75 unsigned long txlen;
76 unsigned long tx_time;
77 struct timespec send_stamp;
78 };
79
80 /**
81 * Definition of one channel
82 */
83 struct channel {
84
85 /**
86 * Pointer to next channel in list.
87 */
88 struct channel *next;
89 char id[CTC_ID_SIZE];
90 struct ccw_device *cdev;
91
92 /**
93 * Type of this channel.
94 * CTC/A or Escon for valid channels.
95 */
96 enum channel_types type;
97
98 /**
99 * Misc. flags. See CHANNEL_FLAGS_... below
100 */
101 __u32 flags;
102
103 /**
104 * The protocol of this channel
105 */
106 __u16 protocol;
107
108 /**
109 * I/O and irq related stuff
110 */
111 struct ccw1 *ccw;
112 struct irb *irb;
113
114 /**
115 * RX/TX buffer size
116 */
117 int max_bufsize;
118
119 /**
120 * Transmit/Receive buffer.
121 */
122 struct sk_buff *trans_skb;
123
124 /**
125 * Universal I/O queue.
126 */
127 struct sk_buff_head io_queue;
128
129 /**
130 * TX queue for collecting skb's during busy.
131 */
132 struct sk_buff_head collect_queue;
133
134 /**
135 * Amount of data in collect_queue.
136 */
137 int collect_len;
138
139 /**
140 * spinlock for collect_queue and collect_len
141 */
142 spinlock_t collect_lock;
143
144 /**
145 * Timer for detecting unresposive
146 * I/O operations.
147 */
148 fsm_timer timer;
149
150 /**
151 * Retry counter for misc. operations.
152 */
153 int retry;
154
155 /**
156 * The finite state machine of this channel
157 */
158 fsm_instance *fsm;
159
160 /**
161 * The corresponding net_device this channel
162 * belongs to.
163 */
164 struct net_device *netdev;
165
166 struct ctc_profile prof;
167
168 unsigned char *trans_skb_data;
169
170 __u16 logflags;
171 };
172
173 #define CHANNEL_FLAGS_READ 0
174 #define CHANNEL_FLAGS_WRITE 1
175 #define CHANNEL_FLAGS_INUSE 2
176 #define CHANNEL_FLAGS_BUFSIZE_CHANGED 4
177 #define CHANNEL_FLAGS_FAILED 8
178 #define CHANNEL_FLAGS_WAITIRQ 16
179 #define CHANNEL_FLAGS_RWMASK 1
180 #define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
181
182 #define LOG_FLAG_ILLEGALPKT 1
183 #define LOG_FLAG_ILLEGALSIZE 2
184 #define LOG_FLAG_OVERRUN 4
185 #define LOG_FLAG_NOMEM 8
186
187 #define CTC_LOGLEVEL_INFO 1
188 #define CTC_LOGLEVEL_NOTICE 2
189 #define CTC_LOGLEVEL_WARN 4
190 #define CTC_LOGLEVEL_EMERG 8
191 #define CTC_LOGLEVEL_ERR 16
192 #define CTC_LOGLEVEL_DEBUG 32
193 #define CTC_LOGLEVEL_CRIT 64
194
195 #define CTC_LOGLEVEL_DEFAULT \
196 (CTC_LOGLEVEL_INFO | CTC_LOGLEVEL_NOTICE | CTC_LOGLEVEL_WARN | CTC_LOGLEVEL_CRIT)
197
198 #define CTC_LOGLEVEL_MAX ((CTC_LOGLEVEL_CRIT<<1)-1)
199
200 #define ctc_pr_debug(fmt, arg...) \
201 do { if (loglevel & CTC_LOGLEVEL_DEBUG) printk(KERN_DEBUG fmt,##arg); } while (0)
202
203 #define ctc_pr_info(fmt, arg...) \
204 do { if (loglevel & CTC_LOGLEVEL_INFO) printk(KERN_INFO fmt,##arg); } while (0)
205
206 #define ctc_pr_notice(fmt, arg...) \
207 do { if (loglevel & CTC_LOGLEVEL_NOTICE) printk(KERN_NOTICE fmt,##arg); } while (0)
208
209 #define ctc_pr_warn(fmt, arg...) \
210 do { if (loglevel & CTC_LOGLEVEL_WARN) printk(KERN_WARNING fmt,##arg); } while (0)
211
212 #define ctc_pr_emerg(fmt, arg...) \
213 do { if (loglevel & CTC_LOGLEVEL_EMERG) printk(KERN_EMERG fmt,##arg); } while (0)
214
215 #define ctc_pr_err(fmt, arg...) \
216 do { if (loglevel & CTC_LOGLEVEL_ERR) printk(KERN_ERR fmt,##arg); } while (0)
217
218 #define ctc_pr_crit(fmt, arg...) \
219 do { if (loglevel & CTC_LOGLEVEL_CRIT) printk(KERN_CRIT fmt,##arg); } while (0)
220
221 struct ctc_priv {
222 struct net_device_stats stats;
223 unsigned long tbusy;
224 /**
225 * The finite state machine of this interface.
226 */
227 fsm_instance *fsm;
228 /**
229 * The protocol of this device
230 */
231 __u16 protocol;
232 /**
233 * Timer for restarting after I/O Errors
234 */
235 fsm_timer restart_timer;
236
237 int buffer_size;
238
239 struct channel *channel[2];
240 };
241
242 /**
243 * Definition of our link level header.
244 */
245 struct ll_header {
246 __u16 length;
247 __u16 type;
248 __u16 unused;
249 };
250 #define LL_HEADER_LENGTH (sizeof(struct ll_header))
251
252 /**
253 * Compatibility macros for busy handling
254 * of network devices.
255 */
256 static __inline__ void
257 ctc_clear_busy(struct net_device * dev)
258 {
259 clear_bit(0, &(((struct ctc_priv *) dev->priv)->tbusy));
260 netif_wake_queue(dev);
261 }
262
263 static __inline__ int
264 ctc_test_and_set_busy(struct net_device * dev)
265 {
266 netif_stop_queue(dev);
267 return test_and_set_bit(0, &((struct ctc_priv *) dev->priv)->tbusy);
268 }
269
270 #endif
271
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