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1/*
2 * Copyright IBM Corp. 2001, 2007
3 * Authors: Fritz Elfert (felfert@millenux.com)
4 * Peter Tiedemann (ptiedem@de.ibm.com)
5 */
6
7#ifndef _CTCM_MAIN_H_
8#define _CTCM_MAIN_H_
9
10#include <asm/ccwdev.h>
11#include <asm/ccwgroup.h>
12
13#include <linux/skbuff.h>
14#include <linux/netdevice.h>
15
16#include "fsm.h"
17#include "ctcm_dbug.h"
18#include "ctcm_mpc.h"
19
20#define CTC_DRIVER_NAME "ctcm"
21#define CTC_DEVICE_NAME "ctc"
22#define MPC_DEVICE_NAME "mpc"
23#define CTC_DEVICE_GENE CTC_DEVICE_NAME "%d"
24#define MPC_DEVICE_GENE MPC_DEVICE_NAME "%d"
25
26#define CHANNEL_FLAGS_READ 0
27#define CHANNEL_FLAGS_WRITE 1
28#define CHANNEL_FLAGS_INUSE 2
29#define CHANNEL_FLAGS_BUFSIZE_CHANGED 4
30#define CHANNEL_FLAGS_FAILED 8
31#define CHANNEL_FLAGS_WAITIRQ 16
32#define CHANNEL_FLAGS_RWMASK 1
33#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
34
35#define LOG_FLAG_ILLEGALPKT 1
36#define LOG_FLAG_ILLEGALSIZE 2
37#define LOG_FLAG_OVERRUN 4
38#define LOG_FLAG_NOMEM 8
39
40#define ctcm_pr_debug(fmt, arg...) printk(KERN_DEBUG fmt, ##arg)
41
42#define CTCM_PR_DEBUG(fmt, arg...) \
43 do { \
44 if (do_debug) \
45 printk(KERN_DEBUG fmt, ##arg); \
46 } while (0)
47
48#define CTCM_PR_DBGDATA(fmt, arg...) \
49 do { \
50 if (do_debug_data) \
51 printk(KERN_DEBUG fmt, ##arg); \
52 } while (0)
53
54#define CTCM_D3_DUMP(buf, len) \
55 do { \
56 if (do_debug_data) \
57 ctcmpc_dumpit(buf, len); \
58 } while (0)
59
60#define CTCM_CCW_DUMP(buf, len) \
61 do { \
62 if (do_debug_ccw) \
63 ctcmpc_dumpit(buf, len); \
64 } while (0)
65
66/**
67 * Enum for classifying detected devices
68 */
69enum ctcm_channel_types {
70 /* Device is not a channel */
71 ctcm_channel_type_none,
72
73 /* Device is a CTC/A */
74 ctcm_channel_type_parallel,
75
76 /* Device is a FICON channel */
77 ctcm_channel_type_ficon,
78
79 /* Device is a ESCON channel */
80 ctcm_channel_type_escon
81};
82
83/*
84 * CCW commands, used in this driver.
85 */
86#define CCW_CMD_WRITE 0x01
87#define CCW_CMD_READ 0x02
88#define CCW_CMD_NOOP 0x03
89#define CCW_CMD_TIC 0x08
90#define CCW_CMD_SENSE_CMD 0x14
91#define CCW_CMD_WRITE_CTL 0x17
92#define CCW_CMD_SET_EXTENDED 0xc3
93#define CCW_CMD_PREPARE 0xe3
94
95#define CTCM_PROTO_S390 0
96#define CTCM_PROTO_LINUX 1
97#define CTCM_PROTO_LINUX_TTY 2
98#define CTCM_PROTO_OS390 3
99#define CTCM_PROTO_MPC 4
100#define CTCM_PROTO_MAX 4
101
102#define CTCM_BUFSIZE_LIMIT 65535
103#define CTCM_BUFSIZE_DEFAULT 32768
104#define MPC_BUFSIZE_DEFAULT CTCM_BUFSIZE_LIMIT
105
106#define CTCM_TIME_1_SEC 1000
107#define CTCM_TIME_5_SEC 5000
108#define CTCM_TIME_10_SEC 10000
109
110#define CTCM_INITIAL_BLOCKLEN 2
111
112#define CTCM_READ 0
113#define CTCM_WRITE 1
114
115#define CTCM_ID_SIZE 20+3
116
117struct ctcm_profile {
118 unsigned long maxmulti;
119 unsigned long maxcqueue;
120 unsigned long doios_single;
121 unsigned long doios_multi;
122 unsigned long txlen;
123 unsigned long tx_time;
124 struct timespec send_stamp;
125};
126
127/*
128 * Definition of one channel
129 */
130struct channel {
131 struct channel *next;
132 char id[CTCM_ID_SIZE];
133 struct ccw_device *cdev;
134 /*
135 * Type of this channel.
136 * CTC/A or Escon for valid channels.
137 */
138 enum ctcm_channel_types type;
139 /*
140 * Misc. flags. See CHANNEL_FLAGS_... below
141 */
142 __u32 flags;
143 __u16 protocol; /* protocol of this channel (4 = MPC) */
144 /*
145 * I/O and irq related stuff
146 */
147 struct ccw1 *ccw;
148 struct irb *irb;
149 /*
150 * RX/TX buffer size
151 */
152 int max_bufsize;
153 struct sk_buff *trans_skb; /* transmit/receive buffer */
154 struct sk_buff_head io_queue; /* universal I/O queue */
155 struct tasklet_struct ch_tasklet; /* MPC ONLY */
156 /*
157 * TX queue for collecting skb's during busy.
158 */
159 struct sk_buff_head collect_queue;
160 /*
161 * Amount of data in collect_queue.
162 */
163 int collect_len;
164 /*
165 * spinlock for collect_queue and collect_len
166 */
167 spinlock_t collect_lock;
168 /*
169 * Timer for detecting unresposive
170 * I/O operations.
171 */
172 fsm_timer timer;
173 /* MPC ONLY section begin */
174 __u32 th_seq_num; /* SNA TH seq number */
175 __u8 th_seg;
176 __u32 pdu_seq;
177 struct sk_buff *xid_skb;
178 char *xid_skb_data;
179 struct th_header *xid_th;
180 struct xid2 *xid;
181 char *xid_id;
182 struct th_header *rcvd_xid_th;
183 struct xid2 *rcvd_xid;
184 char *rcvd_xid_id;
185 __u8 in_mpcgroup;
186 fsm_timer sweep_timer;
187 struct sk_buff_head sweep_queue;
188 struct th_header *discontact_th;
189 struct tasklet_struct ch_disc_tasklet;
190 /* MPC ONLY section end */
191
192 int retry; /* retry counter for misc. operations */
193 fsm_instance *fsm; /* finite state machine of this channel */
194 struct net_device *netdev; /* corresponding net_device */
195 struct ctcm_profile prof;
196 __u8 *trans_skb_data;
197 __u16 logflags;
198 __u8 sense_rc; /* last unit check sense code report control */
199};
200
201struct ctcm_priv {
202 struct net_device_stats stats;
203 unsigned long tbusy;
204
205 /* The MPC group struct of this interface */
206 struct mpc_group *mpcg; /* MPC only */
207 struct xid2 *xid; /* MPC only */
208
209 /* The finite state machine of this interface */
210 fsm_instance *fsm;
211
212 /* The protocol of this device */
213 __u16 protocol;
214
215 /* Timer for restarting after I/O Errors */
216 fsm_timer restart_timer;
217
218 int buffer_size; /* ctc only */
219
220 struct channel *channel[2];
221};
222
223int ctcm_open(struct net_device *dev);
224int ctcm_close(struct net_device *dev);
225
226extern const struct attribute_group *ctcm_attr_groups[];
227
228/*
229 * Compatibility macros for busy handling
230 * of network devices.
231 */
232static inline void ctcm_clear_busy_do(struct net_device *dev)
233{
234 clear_bit(0, &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
235 netif_wake_queue(dev);
236}
237
238static inline void ctcm_clear_busy(struct net_device *dev)
239{
240 struct mpc_group *grp;
241 grp = ((struct ctcm_priv *)dev->ml_priv)->mpcg;
242
243 if (!(grp && grp->in_sweep))
244 ctcm_clear_busy_do(dev);
245}
246
247
248static inline int ctcm_test_and_set_busy(struct net_device *dev)
249{
250 netif_stop_queue(dev);
251 return test_and_set_bit(0,
252 &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
253}
254
255extern int loglevel;
256extern struct channel *channels;
257
258void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb);
259
260/*
261 * Functions related to setup and device detection.
262 */
263
264static inline int ctcm_less_than(char *id1, char *id2)
265{
266 unsigned long dev1, dev2;
267
268 id1 = id1 + 5;
269 id2 = id2 + 5;
270
271 dev1 = simple_strtoul(id1, &id1, 16);
272 dev2 = simple_strtoul(id2, &id2, 16);
273
274 return (dev1 < dev2);
275}
276
277int ctcm_ch_alloc_buffer(struct channel *ch);
278
279static inline int ctcm_checkalloc_buffer(struct channel *ch)
280{
281 if (ch->trans_skb == NULL)
282 return ctcm_ch_alloc_buffer(ch);
283 if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) {
284 dev_kfree_skb(ch->trans_skb);
285 return ctcm_ch_alloc_buffer(ch);
286 }
287 return 0;
288}
289
290struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
291
292/* test if protocol attribute (of struct ctcm_priv or struct channel)
293 * has MPC protocol setting. Type is not checked
294 */
295#define IS_MPC(p) ((p)->protocol == CTCM_PROTO_MPC)
296
297/* test if struct ctcm_priv of struct net_device has MPC protocol setting */
298#define IS_MPCDEV(dev) IS_MPC((struct ctcm_priv *)dev->ml_priv)
299
300static inline gfp_t gfp_type(void)
301{
302 return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
303}
304
305/*
306 * Definition of our link level header.
307 */
308struct ll_header {
309 __u16 length;
310 __u16 type;
311 __u16 unused;
312};
313#define LL_HEADER_LENGTH (sizeof(struct ll_header))
314
315#endif