netiucv: change name of nop function
[linux-2.6.git] / drivers / s390 / net / netiucv.c
1 /*
2  * IUCV network driver
3  *
4  * Copyright 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
5  * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
6  *
7  * Sysfs integration and all bugs therein by Cornelia Huck
8  * (cornelia.huck@de.ibm.com)
9  *
10  * Documentation used:
11  *  the source of the original IUCV driver by:
12  *    Stefan Hegewald <hegewald@de.ibm.com>
13  *    Hartmut Penner <hpenner@de.ibm.com>
14  *    Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
15  *    Martin Schwidefsky (schwidefsky@de.ibm.com)
16  *    Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
17  *
18  * This program is free software; you can redistribute it and/or modify
19  * it under the terms of the GNU General Public License as published by
20  * the Free Software Foundation; either version 2, or (at your option)
21  * any later version.
22  *
23  * This program is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
26  * GNU General Public License for more details.
27  *
28  * You should have received a copy of the GNU General Public License
29  * along with this program; if not, write to the Free Software
30  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31  *
32  */
33
34 #undef DEBUG
35
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/kernel.h>
39 #include <linux/slab.h>
40 #include <linux/errno.h>
41 #include <linux/types.h>
42 #include <linux/interrupt.h>
43 #include <linux/timer.h>
44 #include <linux/bitops.h>
45
46 #include <linux/signal.h>
47 #include <linux/string.h>
48 #include <linux/device.h>
49
50 #include <linux/ip.h>
51 #include <linux/if_arp.h>
52 #include <linux/tcp.h>
53 #include <linux/skbuff.h>
54 #include <linux/ctype.h>
55 #include <net/dst.h>
56
57 #include <asm/io.h>
58 #include <asm/uaccess.h>
59
60 #include <net/iucv/iucv.h>
61 #include "fsm.h"
62
63 MODULE_AUTHOR
64     ("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)");
65 MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver");
66
67 /**
68  * Debug Facility stuff
69  */
70 #define IUCV_DBF_SETUP_NAME "iucv_setup"
71 #define IUCV_DBF_SETUP_LEN 32
72 #define IUCV_DBF_SETUP_PAGES 2
73 #define IUCV_DBF_SETUP_NR_AREAS 1
74 #define IUCV_DBF_SETUP_LEVEL 3
75
76 #define IUCV_DBF_DATA_NAME "iucv_data"
77 #define IUCV_DBF_DATA_LEN 128
78 #define IUCV_DBF_DATA_PAGES 2
79 #define IUCV_DBF_DATA_NR_AREAS 1
80 #define IUCV_DBF_DATA_LEVEL 2
81
82 #define IUCV_DBF_TRACE_NAME "iucv_trace"
83 #define IUCV_DBF_TRACE_LEN 16
84 #define IUCV_DBF_TRACE_PAGES 4
85 #define IUCV_DBF_TRACE_NR_AREAS 1
86 #define IUCV_DBF_TRACE_LEVEL 3
87
88 #define IUCV_DBF_TEXT(name,level,text) \
89         do { \
90                 debug_text_event(iucv_dbf_##name,level,text); \
91         } while (0)
92
93 #define IUCV_DBF_HEX(name,level,addr,len) \
94         do { \
95                 debug_event(iucv_dbf_##name,level,(void*)(addr),len); \
96         } while (0)
97
98 DECLARE_PER_CPU(char[256], iucv_dbf_txt_buf);
99
100 #define IUCV_DBF_TEXT_(name,level,text...)                              \
101         do {                                                            \
102                 char* iucv_dbf_txt_buf = get_cpu_var(iucv_dbf_txt_buf); \
103                 sprintf(iucv_dbf_txt_buf, text);                        \
104                 debug_text_event(iucv_dbf_##name,level,iucv_dbf_txt_buf); \
105                 put_cpu_var(iucv_dbf_txt_buf);                          \
106         } while (0)
107
108 #define IUCV_DBF_SPRINTF(name,level,text...) \
109         do { \
110                 debug_sprintf_event(iucv_dbf_trace, level, ##text ); \
111                 debug_sprintf_event(iucv_dbf_trace, level, text ); \
112         } while (0)
113
114 /**
115  * some more debug stuff
116  */
117 #define IUCV_HEXDUMP16(importance,header,ptr) \
118 PRINT_##importance(header "%02x %02x %02x %02x  %02x %02x %02x %02x  " \
119                    "%02x %02x %02x %02x  %02x %02x %02x %02x\n", \
120                    *(((char*)ptr)),*(((char*)ptr)+1),*(((char*)ptr)+2), \
121                    *(((char*)ptr)+3),*(((char*)ptr)+4),*(((char*)ptr)+5), \
122                    *(((char*)ptr)+6),*(((char*)ptr)+7),*(((char*)ptr)+8), \
123                    *(((char*)ptr)+9),*(((char*)ptr)+10),*(((char*)ptr)+11), \
124                    *(((char*)ptr)+12),*(((char*)ptr)+13), \
125                    *(((char*)ptr)+14),*(((char*)ptr)+15)); \
126 PRINT_##importance(header "%02x %02x %02x %02x  %02x %02x %02x %02x  " \
127                    "%02x %02x %02x %02x  %02x %02x %02x %02x\n", \
128                    *(((char*)ptr)+16),*(((char*)ptr)+17), \
129                    *(((char*)ptr)+18),*(((char*)ptr)+19), \
130                    *(((char*)ptr)+20),*(((char*)ptr)+21), \
131                    *(((char*)ptr)+22),*(((char*)ptr)+23), \
132                    *(((char*)ptr)+24),*(((char*)ptr)+25), \
133                    *(((char*)ptr)+26),*(((char*)ptr)+27), \
134                    *(((char*)ptr)+28),*(((char*)ptr)+29), \
135                    *(((char*)ptr)+30),*(((char*)ptr)+31));
136
137 #define PRINTK_HEADER " iucv: "       /* for debugging */
138
139 static struct device_driver netiucv_driver = {
140         .owner = THIS_MODULE,
141         .name = "netiucv",
142         .bus  = &iucv_bus,
143 };
144
145 static int netiucv_callback_connreq(struct iucv_path *,
146                                     u8 ipvmid[8], u8 ipuser[16]);
147 static void netiucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
148 static void netiucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
149 static void netiucv_callback_connsusp(struct iucv_path *, u8 ipuser[16]);
150 static void netiucv_callback_connres(struct iucv_path *, u8 ipuser[16]);
151 static void netiucv_callback_rx(struct iucv_path *, struct iucv_message *);
152 static void netiucv_callback_txdone(struct iucv_path *, struct iucv_message *);
153
154 static struct iucv_handler netiucv_handler = {
155         .path_pending     = netiucv_callback_connreq,
156         .path_complete    = netiucv_callback_connack,
157         .path_severed     = netiucv_callback_connrej,
158         .path_quiesced    = netiucv_callback_connsusp,
159         .path_resumed     = netiucv_callback_connres,
160         .message_pending  = netiucv_callback_rx,
161         .message_complete = netiucv_callback_txdone
162 };
163
164 /**
165  * Per connection profiling data
166  */
167 struct connection_profile {
168         unsigned long maxmulti;
169         unsigned long maxcqueue;
170         unsigned long doios_single;
171         unsigned long doios_multi;
172         unsigned long txlen;
173         unsigned long tx_time;
174         struct timespec send_stamp;
175         unsigned long tx_pending;
176         unsigned long tx_max_pending;
177 };
178
179 /**
180  * Representation of one iucv connection
181  */
182 struct iucv_connection {
183         struct list_head          list;
184         struct iucv_path          *path;
185         struct sk_buff            *rx_buff;
186         struct sk_buff            *tx_buff;
187         struct sk_buff_head       collect_queue;
188         struct sk_buff_head       commit_queue;
189         spinlock_t                collect_lock;
190         int                       collect_len;
191         int                       max_buffsize;
192         fsm_timer                 timer;
193         fsm_instance              *fsm;
194         struct net_device         *netdev;
195         struct connection_profile prof;
196         char                      userid[9];
197 };
198
199 /**
200  * Linked list of all connection structs.
201  */
202 static LIST_HEAD(iucv_connection_list);
203 static DEFINE_RWLOCK(iucv_connection_rwlock);
204
205 /**
206  * Representation of event-data for the
207  * connection state machine.
208  */
209 struct iucv_event {
210         struct iucv_connection *conn;
211         void                   *data;
212 };
213
214 /**
215  * Private part of the network device structure
216  */
217 struct netiucv_priv {
218         struct net_device_stats stats;
219         unsigned long           tbusy;
220         fsm_instance            *fsm;
221         struct iucv_connection  *conn;
222         struct device           *dev;
223 };
224
225 /**
226  * Link level header for a packet.
227  */
228 struct ll_header {
229         u16 next;
230 };
231
232 #define NETIUCV_HDRLEN           (sizeof(struct ll_header))
233 #define NETIUCV_BUFSIZE_MAX      32768
234 #define NETIUCV_BUFSIZE_DEFAULT  NETIUCV_BUFSIZE_MAX
235 #define NETIUCV_MTU_MAX          (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN)
236 #define NETIUCV_MTU_DEFAULT      9216
237 #define NETIUCV_QUEUELEN_DEFAULT 50
238 #define NETIUCV_TIMEOUT_5SEC     5000
239
240 /**
241  * Compatibility macros for busy handling
242  * of network devices.
243  */
244 static inline void netiucv_clear_busy(struct net_device *dev)
245 {
246         struct netiucv_priv *priv = netdev_priv(dev);
247         clear_bit(0, &priv->tbusy);
248         netif_wake_queue(dev);
249 }
250
251 static inline int netiucv_test_and_set_busy(struct net_device *dev)
252 {
253         struct netiucv_priv *priv = netdev_priv(dev);
254         netif_stop_queue(dev);
255         return test_and_set_bit(0, &priv->tbusy);
256 }
257
258 static u8 iucvMagic[16] = {
259         0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
260         0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
261 };
262
263 /**
264  * Convert an iucv userId to its printable
265  * form (strip whitespace at end).
266  *
267  * @param An iucv userId
268  *
269  * @returns The printable string (static data!!)
270  */
271 static char *netiucv_printname(char *name)
272 {
273         static char tmp[9];
274         char *p = tmp;
275         memcpy(tmp, name, 8);
276         tmp[8] = '\0';
277         while (*p && (!isspace(*p)))
278                 p++;
279         *p = '\0';
280         return tmp;
281 }
282
283 /**
284  * States of the interface statemachine.
285  */
286 enum dev_states {
287         DEV_STATE_STOPPED,
288         DEV_STATE_STARTWAIT,
289         DEV_STATE_STOPWAIT,
290         DEV_STATE_RUNNING,
291         /**
292          * MUST be always the last element!!
293          */
294         NR_DEV_STATES
295 };
296
297 static const char *dev_state_names[] = {
298         "Stopped",
299         "StartWait",
300         "StopWait",
301         "Running",
302 };
303
304 /**
305  * Events of the interface statemachine.
306  */
307 enum dev_events {
308         DEV_EVENT_START,
309         DEV_EVENT_STOP,
310         DEV_EVENT_CONUP,
311         DEV_EVENT_CONDOWN,
312         /**
313          * MUST be always the last element!!
314          */
315         NR_DEV_EVENTS
316 };
317
318 static const char *dev_event_names[] = {
319         "Start",
320         "Stop",
321         "Connection up",
322         "Connection down",
323 };
324
325 /**
326  * Events of the connection statemachine
327  */
328 enum conn_events {
329         /**
330          * Events, representing callbacks from
331          * lowlevel iucv layer)
332          */
333         CONN_EVENT_CONN_REQ,
334         CONN_EVENT_CONN_ACK,
335         CONN_EVENT_CONN_REJ,
336         CONN_EVENT_CONN_SUS,
337         CONN_EVENT_CONN_RES,
338         CONN_EVENT_RX,
339         CONN_EVENT_TXDONE,
340
341         /**
342          * Events, representing errors return codes from
343          * calls to lowlevel iucv layer
344          */
345
346         /**
347          * Event, representing timer expiry.
348          */
349         CONN_EVENT_TIMER,
350
351         /**
352          * Events, representing commands from upper levels.
353          */
354         CONN_EVENT_START,
355         CONN_EVENT_STOP,
356
357         /**
358          * MUST be always the last element!!
359          */
360         NR_CONN_EVENTS,
361 };
362
363 static const char *conn_event_names[] = {
364         "Remote connection request",
365         "Remote connection acknowledge",
366         "Remote connection reject",
367         "Connection suspended",
368         "Connection resumed",
369         "Data received",
370         "Data sent",
371
372         "Timer",
373
374         "Start",
375         "Stop",
376 };
377
378 /**
379  * States of the connection statemachine.
380  */
381 enum conn_states {
382         /**
383          * Connection not assigned to any device,
384          * initial state, invalid
385          */
386         CONN_STATE_INVALID,
387
388         /**
389          * Userid assigned but not operating
390          */
391         CONN_STATE_STOPPED,
392
393         /**
394          * Connection registered,
395          * no connection request sent yet,
396          * no connection request received
397          */
398         CONN_STATE_STARTWAIT,
399
400         /**
401          * Connection registered and connection request sent,
402          * no acknowledge and no connection request received yet.
403          */
404         CONN_STATE_SETUPWAIT,
405
406         /**
407          * Connection up and running idle
408          */
409         CONN_STATE_IDLE,
410
411         /**
412          * Data sent, awaiting CONN_EVENT_TXDONE
413          */
414         CONN_STATE_TX,
415
416         /**
417          * Error during registration.
418          */
419         CONN_STATE_REGERR,
420
421         /**
422          * Error during registration.
423          */
424         CONN_STATE_CONNERR,
425
426         /**
427          * MUST be always the last element!!
428          */
429         NR_CONN_STATES,
430 };
431
432 static const char *conn_state_names[] = {
433         "Invalid",
434         "Stopped",
435         "StartWait",
436         "SetupWait",
437         "Idle",
438         "TX",
439         "Terminating",
440         "Registration error",
441         "Connect error",
442 };
443
444
445 /**
446  * Debug Facility Stuff
447  */
448 static debug_info_t *iucv_dbf_setup = NULL;
449 static debug_info_t *iucv_dbf_data = NULL;
450 static debug_info_t *iucv_dbf_trace = NULL;
451
452 DEFINE_PER_CPU(char[256], iucv_dbf_txt_buf);
453
454 static void iucv_unregister_dbf_views(void)
455 {
456         if (iucv_dbf_setup)
457                 debug_unregister(iucv_dbf_setup);
458         if (iucv_dbf_data)
459                 debug_unregister(iucv_dbf_data);
460         if (iucv_dbf_trace)
461                 debug_unregister(iucv_dbf_trace);
462 }
463 static int iucv_register_dbf_views(void)
464 {
465         iucv_dbf_setup = debug_register(IUCV_DBF_SETUP_NAME,
466                                         IUCV_DBF_SETUP_PAGES,
467                                         IUCV_DBF_SETUP_NR_AREAS,
468                                         IUCV_DBF_SETUP_LEN);
469         iucv_dbf_data = debug_register(IUCV_DBF_DATA_NAME,
470                                        IUCV_DBF_DATA_PAGES,
471                                        IUCV_DBF_DATA_NR_AREAS,
472                                        IUCV_DBF_DATA_LEN);
473         iucv_dbf_trace = debug_register(IUCV_DBF_TRACE_NAME,
474                                         IUCV_DBF_TRACE_PAGES,
475                                         IUCV_DBF_TRACE_NR_AREAS,
476                                         IUCV_DBF_TRACE_LEN);
477
478         if ((iucv_dbf_setup == NULL) || (iucv_dbf_data == NULL) ||
479             (iucv_dbf_trace == NULL)) {
480                 iucv_unregister_dbf_views();
481                 return -ENOMEM;
482         }
483         debug_register_view(iucv_dbf_setup, &debug_hex_ascii_view);
484         debug_set_level(iucv_dbf_setup, IUCV_DBF_SETUP_LEVEL);
485
486         debug_register_view(iucv_dbf_data, &debug_hex_ascii_view);
487         debug_set_level(iucv_dbf_data, IUCV_DBF_DATA_LEVEL);
488
489         debug_register_view(iucv_dbf_trace, &debug_hex_ascii_view);
490         debug_set_level(iucv_dbf_trace, IUCV_DBF_TRACE_LEVEL);
491
492         return 0;
493 }
494
495 /*
496  * Callback-wrappers, called from lowlevel iucv layer.
497  */
498
499 static void netiucv_callback_rx(struct iucv_path *path,
500                                 struct iucv_message *msg)
501 {
502         struct iucv_connection *conn = path->private;
503         struct iucv_event ev;
504
505         ev.conn = conn;
506         ev.data = msg;
507         fsm_event(conn->fsm, CONN_EVENT_RX, &ev);
508 }
509
510 static void netiucv_callback_txdone(struct iucv_path *path,
511                                     struct iucv_message *msg)
512 {
513         struct iucv_connection *conn = path->private;
514         struct iucv_event ev;
515
516         ev.conn = conn;
517         ev.data = msg;
518         fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev);
519 }
520
521 static void netiucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
522 {
523         struct iucv_connection *conn = path->private;
524
525         fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, conn);
526 }
527
528 static int netiucv_callback_connreq(struct iucv_path *path,
529                                     u8 ipvmid[8], u8 ipuser[16])
530 {
531         struct iucv_connection *conn = path->private;
532         struct iucv_event ev;
533         int rc;
534
535         if (memcmp(iucvMagic, ipuser, sizeof(ipuser)))
536                 /* ipuser must match iucvMagic. */
537                 return -EINVAL;
538         rc = -EINVAL;
539         read_lock_bh(&iucv_connection_rwlock);
540         list_for_each_entry(conn, &iucv_connection_list, list) {
541                 if (strncmp(ipvmid, conn->userid, 8))
542                         continue;
543                 /* Found a matching connection for this path. */
544                 conn->path = path;
545                 ev.conn = conn;
546                 ev.data = path;
547                 fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev);
548                 rc = 0;
549         }
550         read_unlock_bh(&iucv_connection_rwlock);
551         return rc;
552 }
553
554 static void netiucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
555 {
556         struct iucv_connection *conn = path->private;
557
558         fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, conn);
559 }
560
561 static void netiucv_callback_connsusp(struct iucv_path *path, u8 ipuser[16])
562 {
563         struct iucv_connection *conn = path->private;
564
565         fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, conn);
566 }
567
568 static void netiucv_callback_connres(struct iucv_path *path, u8 ipuser[16])
569 {
570         struct iucv_connection *conn = path->private;
571
572         fsm_event(conn->fsm, CONN_EVENT_CONN_RES, conn);
573 }
574
575 /**
576  * NOP action for statemachines
577  */
578 static void netiucv_action_nop(fsm_instance *fi, int event, void *arg)
579 {
580 }
581
582 /*
583  * Actions of the connection statemachine
584  */
585
586 /**
587  * netiucv_unpack_skb
588  * @conn: The connection where this skb has been received.
589  * @pskb: The received skb.
590  *
591  * Unpack a just received skb and hand it over to upper layers.
592  * Helper function for conn_action_rx.
593  */
594 static void netiucv_unpack_skb(struct iucv_connection *conn,
595                                struct sk_buff *pskb)
596 {
597         struct net_device     *dev = conn->netdev;
598         struct netiucv_priv   *privptr = netdev_priv(dev);
599         u16 offset = 0;
600
601         skb_put(pskb, NETIUCV_HDRLEN);
602         pskb->dev = dev;
603         pskb->ip_summed = CHECKSUM_NONE;
604         pskb->protocol = ntohs(ETH_P_IP);
605
606         while (1) {
607                 struct sk_buff *skb;
608                 struct ll_header *header = (struct ll_header *) pskb->data;
609
610                 if (!header->next)
611                         break;
612
613                 skb_pull(pskb, NETIUCV_HDRLEN);
614                 header->next -= offset;
615                 offset += header->next;
616                 header->next -= NETIUCV_HDRLEN;
617                 if (skb_tailroom(pskb) < header->next) {
618                         PRINT_WARN("%s: Illegal next field in iucv header: "
619                                "%d > %d\n",
620                                dev->name, header->next, skb_tailroom(pskb));
621                         IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n",
622                                 header->next, skb_tailroom(pskb));
623                         return;
624                 }
625                 skb_put(pskb, header->next);
626                 skb_reset_mac_header(pskb);
627                 skb = dev_alloc_skb(pskb->len);
628                 if (!skb) {
629                         PRINT_WARN("%s Out of memory in netiucv_unpack_skb\n",
630                                dev->name);
631                         IUCV_DBF_TEXT(data, 2,
632                                 "Out of memory in netiucv_unpack_skb\n");
633                         privptr->stats.rx_dropped++;
634                         return;
635                 }
636                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
637                                           pskb->len);
638                 skb_reset_mac_header(skb);
639                 skb->dev = pskb->dev;
640                 skb->protocol = pskb->protocol;
641                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
642                 privptr->stats.rx_packets++;
643                 privptr->stats.rx_bytes += skb->len;
644                 /*
645                  * Since receiving is always initiated from a tasklet (in iucv.c),
646                  * we must use netif_rx_ni() instead of netif_rx()
647                  */
648                 netif_rx_ni(skb);
649                 dev->last_rx = jiffies;
650                 skb_pull(pskb, header->next);
651                 skb_put(pskb, NETIUCV_HDRLEN);
652         }
653 }
654
655 static void conn_action_rx(fsm_instance *fi, int event, void *arg)
656 {
657         struct iucv_event *ev = arg;
658         struct iucv_connection *conn = ev->conn;
659         struct iucv_message *msg = ev->data;
660         struct netiucv_priv *privptr = netdev_priv(conn->netdev);
661         int rc;
662
663         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
664
665         if (!conn->netdev) {
666                 iucv_message_reject(conn->path, msg);
667                 PRINT_WARN("Received data for unlinked connection\n");
668                 IUCV_DBF_TEXT(data, 2,
669                               "Received data for unlinked connection\n");
670                 return;
671         }
672         if (msg->length > conn->max_buffsize) {
673                 iucv_message_reject(conn->path, msg);
674                 privptr->stats.rx_dropped++;
675                 PRINT_WARN("msglen %d > max_buffsize %d\n",
676                            msg->length, conn->max_buffsize);
677                 IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n",
678                                msg->length, conn->max_buffsize);
679                 return;
680         }
681         conn->rx_buff->data = conn->rx_buff->head;
682         skb_reset_tail_pointer(conn->rx_buff);
683         conn->rx_buff->len = 0;
684         rc = iucv_message_receive(conn->path, msg, 0, conn->rx_buff->data,
685                                   msg->length, NULL);
686         if (rc || msg->length < 5) {
687                 privptr->stats.rx_errors++;
688                 PRINT_WARN("iucv_receive returned %08x\n", rc);
689                 IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_receive\n", rc);
690                 return;
691         }
692         netiucv_unpack_skb(conn, conn->rx_buff);
693 }
694
695 static void conn_action_txdone(fsm_instance *fi, int event, void *arg)
696 {
697         struct iucv_event *ev = arg;
698         struct iucv_connection *conn = ev->conn;
699         struct iucv_message *msg = ev->data;
700         struct iucv_message txmsg;
701         struct netiucv_priv *privptr = NULL;
702         u32 single_flag = msg->tag;
703         u32 txbytes = 0;
704         u32 txpackets = 0;
705         u32 stat_maxcq = 0;
706         struct sk_buff *skb;
707         unsigned long saveflags;
708         struct ll_header header;
709         int rc;
710
711         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
712
713         if (conn && conn->netdev)
714                 privptr = netdev_priv(conn->netdev);
715         conn->prof.tx_pending--;
716         if (single_flag) {
717                 if ((skb = skb_dequeue(&conn->commit_queue))) {
718                         atomic_dec(&skb->users);
719                         dev_kfree_skb_any(skb);
720                         if (privptr) {
721                                 privptr->stats.tx_packets++;
722                                 privptr->stats.tx_bytes +=
723                                         (skb->len - NETIUCV_HDRLEN
724                                                   - NETIUCV_HDRLEN);
725                         }
726                 }
727         }
728         conn->tx_buff->data = conn->tx_buff->head;
729         skb_reset_tail_pointer(conn->tx_buff);
730         conn->tx_buff->len = 0;
731         spin_lock_irqsave(&conn->collect_lock, saveflags);
732         while ((skb = skb_dequeue(&conn->collect_queue))) {
733                 header.next = conn->tx_buff->len + skb->len + NETIUCV_HDRLEN;
734                 memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
735                        NETIUCV_HDRLEN);
736                 skb_copy_from_linear_data(skb,
737                                           skb_put(conn->tx_buff, skb->len),
738                                           skb->len);
739                 txbytes += skb->len;
740                 txpackets++;
741                 stat_maxcq++;
742                 atomic_dec(&skb->users);
743                 dev_kfree_skb_any(skb);
744         }
745         if (conn->collect_len > conn->prof.maxmulti)
746                 conn->prof.maxmulti = conn->collect_len;
747         conn->collect_len = 0;
748         spin_unlock_irqrestore(&conn->collect_lock, saveflags);
749         if (conn->tx_buff->len == 0) {
750                 fsm_newstate(fi, CONN_STATE_IDLE);
751                 return;
752         }
753
754         header.next = 0;
755         memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
756         conn->prof.send_stamp = current_kernel_time();
757         txmsg.class = 0;
758         txmsg.tag = 0;
759         rc = iucv_message_send(conn->path, &txmsg, 0, 0,
760                                conn->tx_buff->data, conn->tx_buff->len);
761         conn->prof.doios_multi++;
762         conn->prof.txlen += conn->tx_buff->len;
763         conn->prof.tx_pending++;
764         if (conn->prof.tx_pending > conn->prof.tx_max_pending)
765                 conn->prof.tx_max_pending = conn->prof.tx_pending;
766         if (rc) {
767                 conn->prof.tx_pending--;
768                 fsm_newstate(fi, CONN_STATE_IDLE);
769                 if (privptr)
770                         privptr->stats.tx_errors += txpackets;
771                 PRINT_WARN("iucv_send returned %08x\n", rc);
772                 IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
773         } else {
774                 if (privptr) {
775                         privptr->stats.tx_packets += txpackets;
776                         privptr->stats.tx_bytes += txbytes;
777                 }
778                 if (stat_maxcq > conn->prof.maxcqueue)
779                         conn->prof.maxcqueue = stat_maxcq;
780         }
781 }
782
783 static void conn_action_connaccept(fsm_instance *fi, int event, void *arg)
784 {
785         struct iucv_event *ev = arg;
786         struct iucv_connection *conn = ev->conn;
787         struct iucv_path *path = ev->data;
788         struct net_device *netdev = conn->netdev;
789         struct netiucv_priv *privptr = netdev_priv(netdev);
790         int rc;
791
792         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
793
794         conn->path = path;
795         path->msglim = NETIUCV_QUEUELEN_DEFAULT;
796         path->flags = 0;
797         rc = iucv_path_accept(path, &netiucv_handler, NULL, conn);
798         if (rc) {
799                 PRINT_WARN("%s: IUCV accept failed with error %d\n",
800                        netdev->name, rc);
801                 IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc);
802                 return;
803         }
804         fsm_newstate(fi, CONN_STATE_IDLE);
805         netdev->tx_queue_len = conn->path->msglim;
806         fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
807 }
808
809 static void conn_action_connreject(fsm_instance *fi, int event, void *arg)
810 {
811         struct iucv_event *ev = arg;
812         struct iucv_path *path = ev->data;
813
814         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
815         iucv_path_sever(path, NULL);
816 }
817
818 static void conn_action_connack(fsm_instance *fi, int event, void *arg)
819 {
820         struct iucv_connection *conn = arg;
821         struct net_device *netdev = conn->netdev;
822         struct netiucv_priv *privptr = netdev_priv(netdev);
823
824         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
825         fsm_deltimer(&conn->timer);
826         fsm_newstate(fi, CONN_STATE_IDLE);
827         netdev->tx_queue_len = conn->path->msglim;
828         fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
829 }
830
831 static void conn_action_conntimsev(fsm_instance *fi, int event, void *arg)
832 {
833         struct iucv_connection *conn = arg;
834
835         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
836         fsm_deltimer(&conn->timer);
837         iucv_path_sever(conn->path, NULL);
838         fsm_newstate(fi, CONN_STATE_STARTWAIT);
839 }
840
841 static void conn_action_connsever(fsm_instance *fi, int event, void *arg)
842 {
843         struct iucv_connection *conn = arg;
844         struct net_device *netdev = conn->netdev;
845         struct netiucv_priv *privptr = netdev_priv(netdev);
846
847         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
848
849         fsm_deltimer(&conn->timer);
850         iucv_path_sever(conn->path, NULL);
851         PRINT_INFO("%s: Remote dropped connection\n", netdev->name);
852         IUCV_DBF_TEXT(data, 2,
853                       "conn_action_connsever: Remote dropped connection\n");
854         fsm_newstate(fi, CONN_STATE_STARTWAIT);
855         fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
856 }
857
858 static void conn_action_start(fsm_instance *fi, int event, void *arg)
859 {
860         struct iucv_connection *conn = arg;
861         int rc;
862
863         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
864
865         fsm_newstate(fi, CONN_STATE_STARTWAIT);
866         PRINT_DEBUG("%s('%s'): connecting ...\n",
867                     conn->netdev->name, conn->userid);
868
869         /*
870          * We must set the state before calling iucv_connect because the
871          * callback handler could be called at any point after the connection
872          * request is sent
873          */
874
875         fsm_newstate(fi, CONN_STATE_SETUPWAIT);
876         conn->path = iucv_path_alloc(NETIUCV_QUEUELEN_DEFAULT, 0, GFP_KERNEL);
877         rc = iucv_path_connect(conn->path, &netiucv_handler, conn->userid,
878                                NULL, iucvMagic, conn);
879         switch (rc) {
880         case 0:
881                 conn->netdev->tx_queue_len = conn->path->msglim;
882                 fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC,
883                              CONN_EVENT_TIMER, conn);
884                 return;
885         case 11:
886                 PRINT_INFO("%s: User %s is currently not available.\n",
887                            conn->netdev->name,
888                            netiucv_printname(conn->userid));
889                 fsm_newstate(fi, CONN_STATE_STARTWAIT);
890                 break;
891         case 12:
892                 PRINT_INFO("%s: User %s is currently not ready.\n",
893                            conn->netdev->name,
894                            netiucv_printname(conn->userid));
895                 fsm_newstate(fi, CONN_STATE_STARTWAIT);
896                 break;
897         case 13:
898                 PRINT_WARN("%s: Too many IUCV connections.\n",
899                            conn->netdev->name);
900                 fsm_newstate(fi, CONN_STATE_CONNERR);
901                 break;
902         case 14:
903                 PRINT_WARN("%s: User %s has too many IUCV connections.\n",
904                            conn->netdev->name,
905                            netiucv_printname(conn->userid));
906                 fsm_newstate(fi, CONN_STATE_CONNERR);
907                 break;
908         case 15:
909                 PRINT_WARN("%s: No IUCV authorization in CP directory.\n",
910                            conn->netdev->name);
911                 fsm_newstate(fi, CONN_STATE_CONNERR);
912                 break;
913         default:
914                 PRINT_WARN("%s: iucv_connect returned error %d\n",
915                            conn->netdev->name, rc);
916                 fsm_newstate(fi, CONN_STATE_CONNERR);
917                 break;
918         }
919         IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc);
920         kfree(conn->path);
921         conn->path = NULL;
922 }
923
924 static void netiucv_purge_skb_queue(struct sk_buff_head *q)
925 {
926         struct sk_buff *skb;
927
928         while ((skb = skb_dequeue(q))) {
929                 atomic_dec(&skb->users);
930                 dev_kfree_skb_any(skb);
931         }
932 }
933
934 static void conn_action_stop(fsm_instance *fi, int event, void *arg)
935 {
936         struct iucv_event *ev = arg;
937         struct iucv_connection *conn = ev->conn;
938         struct net_device *netdev = conn->netdev;
939         struct netiucv_priv *privptr = netdev_priv(netdev);
940
941         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
942
943         fsm_deltimer(&conn->timer);
944         fsm_newstate(fi, CONN_STATE_STOPPED);
945         netiucv_purge_skb_queue(&conn->collect_queue);
946         if (conn->path) {
947                 IUCV_DBF_TEXT(trace, 5, "calling iucv_path_sever\n");
948                 iucv_path_sever(conn->path, iucvMagic);
949                 kfree(conn->path);
950                 conn->path = NULL;
951         }
952         netiucv_purge_skb_queue(&conn->commit_queue);
953         fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
954 }
955
956 static void conn_action_inval(fsm_instance *fi, int event, void *arg)
957 {
958         struct iucv_connection *conn = arg;
959         struct net_device *netdev = conn->netdev;
960
961         PRINT_WARN("%s: Cannot connect without username\n", netdev->name);
962         IUCV_DBF_TEXT(data, 2, "conn_action_inval called\n");
963 }
964
965 static const fsm_node conn_fsm[] = {
966         { CONN_STATE_INVALID,   CONN_EVENT_START,    conn_action_inval      },
967         { CONN_STATE_STOPPED,   CONN_EVENT_START,    conn_action_start      },
968
969         { CONN_STATE_STOPPED,   CONN_EVENT_STOP,     conn_action_stop       },
970         { CONN_STATE_STARTWAIT, CONN_EVENT_STOP,     conn_action_stop       },
971         { CONN_STATE_SETUPWAIT, CONN_EVENT_STOP,     conn_action_stop       },
972         { CONN_STATE_IDLE,      CONN_EVENT_STOP,     conn_action_stop       },
973         { CONN_STATE_TX,        CONN_EVENT_STOP,     conn_action_stop       },
974         { CONN_STATE_REGERR,    CONN_EVENT_STOP,     conn_action_stop       },
975         { CONN_STATE_CONNERR,   CONN_EVENT_STOP,     conn_action_stop       },
976
977         { CONN_STATE_STOPPED,   CONN_EVENT_CONN_REQ, conn_action_connreject },
978         { CONN_STATE_STARTWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
979         { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
980         { CONN_STATE_IDLE,      CONN_EVENT_CONN_REQ, conn_action_connreject },
981         { CONN_STATE_TX,        CONN_EVENT_CONN_REQ, conn_action_connreject },
982
983         { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_ACK, conn_action_connack    },
984         { CONN_STATE_SETUPWAIT, CONN_EVENT_TIMER,    conn_action_conntimsev },
985
986         { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REJ, conn_action_connsever  },
987         { CONN_STATE_IDLE,      CONN_EVENT_CONN_REJ, conn_action_connsever  },
988         { CONN_STATE_TX,        CONN_EVENT_CONN_REJ, conn_action_connsever  },
989
990         { CONN_STATE_IDLE,      CONN_EVENT_RX,       conn_action_rx         },
991         { CONN_STATE_TX,        CONN_EVENT_RX,       conn_action_rx         },
992
993         { CONN_STATE_TX,        CONN_EVENT_TXDONE,   conn_action_txdone     },
994         { CONN_STATE_IDLE,      CONN_EVENT_TXDONE,   conn_action_txdone     },
995 };
996
997 static const int CONN_FSM_LEN = sizeof(conn_fsm) / sizeof(fsm_node);
998
999
1000 /*
1001  * Actions for interface - statemachine.
1002  */
1003
1004 /**
1005  * dev_action_start
1006  * @fi: An instance of an interface statemachine.
1007  * @event: The event, just happened.
1008  * @arg: Generic pointer, casted from struct net_device * upon call.
1009  *
1010  * Startup connection by sending CONN_EVENT_START to it.
1011  */
1012 static void dev_action_start(fsm_instance *fi, int event, void *arg)
1013 {
1014         struct net_device   *dev = arg;
1015         struct netiucv_priv *privptr = netdev_priv(dev);
1016
1017         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1018
1019         fsm_newstate(fi, DEV_STATE_STARTWAIT);
1020         fsm_event(privptr->conn->fsm, CONN_EVENT_START, privptr->conn);
1021 }
1022
1023 /**
1024  * Shutdown connection by sending CONN_EVENT_STOP to it.
1025  *
1026  * @param fi    An instance of an interface statemachine.
1027  * @param event The event, just happened.
1028  * @param arg   Generic pointer, casted from struct net_device * upon call.
1029  */
1030 static void
1031 dev_action_stop(fsm_instance *fi, int event, void *arg)
1032 {
1033         struct net_device   *dev = arg;
1034         struct netiucv_priv *privptr = netdev_priv(dev);
1035         struct iucv_event   ev;
1036
1037         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1038
1039         ev.conn = privptr->conn;
1040
1041         fsm_newstate(fi, DEV_STATE_STOPWAIT);
1042         fsm_event(privptr->conn->fsm, CONN_EVENT_STOP, &ev);
1043 }
1044
1045 /**
1046  * Called from connection statemachine
1047  * when a connection is up and running.
1048  *
1049  * @param fi    An instance of an interface statemachine.
1050  * @param event The event, just happened.
1051  * @param arg   Generic pointer, casted from struct net_device * upon call.
1052  */
1053 static void
1054 dev_action_connup(fsm_instance *fi, int event, void *arg)
1055 {
1056         struct net_device   *dev = arg;
1057         struct netiucv_priv *privptr = netdev_priv(dev);
1058
1059         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1060
1061         switch (fsm_getstate(fi)) {
1062                 case DEV_STATE_STARTWAIT:
1063                         fsm_newstate(fi, DEV_STATE_RUNNING);
1064                         PRINT_INFO("%s: connected with remote side %s\n",
1065                                dev->name, privptr->conn->userid);
1066                         IUCV_DBF_TEXT(setup, 3,
1067                                 "connection is up and running\n");
1068                         break;
1069                 case DEV_STATE_STOPWAIT:
1070                         PRINT_INFO(
1071                                "%s: got connection UP event during shutdown!\n",
1072                                dev->name);
1073                         IUCV_DBF_TEXT(data, 2,
1074                                 "dev_action_connup: in DEV_STATE_STOPWAIT\n");
1075                         break;
1076         }
1077 }
1078
1079 /**
1080  * Called from connection statemachine
1081  * when a connection has been shutdown.
1082  *
1083  * @param fi    An instance of an interface statemachine.
1084  * @param event The event, just happened.
1085  * @param arg   Generic pointer, casted from struct net_device * upon call.
1086  */
1087 static void
1088 dev_action_conndown(fsm_instance *fi, int event, void *arg)
1089 {
1090         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1091
1092         switch (fsm_getstate(fi)) {
1093                 case DEV_STATE_RUNNING:
1094                         fsm_newstate(fi, DEV_STATE_STARTWAIT);
1095                         break;
1096                 case DEV_STATE_STOPWAIT:
1097                         fsm_newstate(fi, DEV_STATE_STOPPED);
1098                         IUCV_DBF_TEXT(setup, 3, "connection is down\n");
1099                         break;
1100         }
1101 }
1102
1103 static const fsm_node dev_fsm[] = {
1104         { DEV_STATE_STOPPED,    DEV_EVENT_START,   dev_action_start    },
1105
1106         { DEV_STATE_STOPWAIT,   DEV_EVENT_START,   dev_action_start    },
1107         { DEV_STATE_STOPWAIT,   DEV_EVENT_CONDOWN, dev_action_conndown },
1108
1109         { DEV_STATE_STARTWAIT,  DEV_EVENT_STOP,    dev_action_stop     },
1110         { DEV_STATE_STARTWAIT,  DEV_EVENT_CONUP,   dev_action_connup   },
1111
1112         { DEV_STATE_RUNNING,    DEV_EVENT_STOP,    dev_action_stop     },
1113         { DEV_STATE_RUNNING,    DEV_EVENT_CONDOWN, dev_action_conndown },
1114         { DEV_STATE_RUNNING,    DEV_EVENT_CONUP,   netiucv_action_nop  },
1115 };
1116
1117 static const int DEV_FSM_LEN = sizeof(dev_fsm) / sizeof(fsm_node);
1118
1119 /**
1120  * Transmit a packet.
1121  * This is a helper function for netiucv_tx().
1122  *
1123  * @param conn Connection to be used for sending.
1124  * @param skb Pointer to struct sk_buff of packet to send.
1125  *            The linklevel header has already been set up
1126  *            by netiucv_tx().
1127  *
1128  * @return 0 on success, -ERRNO on failure. (Never fails.)
1129  */
1130 static int netiucv_transmit_skb(struct iucv_connection *conn,
1131                                 struct sk_buff *skb)
1132 {
1133         struct iucv_message msg;
1134         unsigned long saveflags;
1135         struct ll_header header;
1136         int rc;
1137
1138         if (fsm_getstate(conn->fsm) != CONN_STATE_IDLE) {
1139                 int l = skb->len + NETIUCV_HDRLEN;
1140
1141                 spin_lock_irqsave(&conn->collect_lock, saveflags);
1142                 if (conn->collect_len + l >
1143                     (conn->max_buffsize - NETIUCV_HDRLEN)) {
1144                         rc = -EBUSY;
1145                         IUCV_DBF_TEXT(data, 2,
1146                                       "EBUSY from netiucv_transmit_skb\n");
1147                 } else {
1148                         atomic_inc(&skb->users);
1149                         skb_queue_tail(&conn->collect_queue, skb);
1150                         conn->collect_len += l;
1151                         rc = 0;
1152                 }
1153                 spin_unlock_irqrestore(&conn->collect_lock, saveflags);
1154         } else {
1155                 struct sk_buff *nskb = skb;
1156                 /**
1157                  * Copy the skb to a new allocated skb in lowmem only if the
1158                  * data is located above 2G in memory or tailroom is < 2.
1159                  */
1160                 unsigned long hi = ((unsigned long)(skb_tail_pointer(skb) +
1161                                     NETIUCV_HDRLEN)) >> 31;
1162                 int copied = 0;
1163                 if (hi || (skb_tailroom(skb) < 2)) {
1164                         nskb = alloc_skb(skb->len + NETIUCV_HDRLEN +
1165                                          NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA);
1166                         if (!nskb) {
1167                                 PRINT_WARN("%s: Could not allocate tx_skb\n",
1168                                        conn->netdev->name);
1169                                 IUCV_DBF_TEXT(data, 2, "alloc_skb failed\n");
1170                                 rc = -ENOMEM;
1171                                 return rc;
1172                         } else {
1173                                 skb_reserve(nskb, NETIUCV_HDRLEN);
1174                                 memcpy(skb_put(nskb, skb->len),
1175                                        skb->data, skb->len);
1176                         }
1177                         copied = 1;
1178                 }
1179                 /**
1180                  * skb now is below 2G and has enough room. Add headers.
1181                  */
1182                 header.next = nskb->len + NETIUCV_HDRLEN;
1183                 memcpy(skb_push(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
1184                 header.next = 0;
1185                 memcpy(skb_put(nskb, NETIUCV_HDRLEN), &header,  NETIUCV_HDRLEN);
1186
1187                 fsm_newstate(conn->fsm, CONN_STATE_TX);
1188                 conn->prof.send_stamp = current_kernel_time();
1189
1190                 msg.tag = 1;
1191                 msg.class = 0;
1192                 rc = iucv_message_send(conn->path, &msg, 0, 0,
1193                                        nskb->data, nskb->len);
1194                 conn->prof.doios_single++;
1195                 conn->prof.txlen += skb->len;
1196                 conn->prof.tx_pending++;
1197                 if (conn->prof.tx_pending > conn->prof.tx_max_pending)
1198                         conn->prof.tx_max_pending = conn->prof.tx_pending;
1199                 if (rc) {
1200                         struct netiucv_priv *privptr;
1201                         fsm_newstate(conn->fsm, CONN_STATE_IDLE);
1202                         conn->prof.tx_pending--;
1203                         privptr = netdev_priv(conn->netdev);
1204                         if (privptr)
1205                                 privptr->stats.tx_errors++;
1206                         if (copied)
1207                                 dev_kfree_skb(nskb);
1208                         else {
1209                                 /**
1210                                  * Remove our headers. They get added
1211                                  * again on retransmit.
1212                                  */
1213                                 skb_pull(skb, NETIUCV_HDRLEN);
1214                                 skb_trim(skb, skb->len - NETIUCV_HDRLEN);
1215                         }
1216                         PRINT_WARN("iucv_send returned %08x\n", rc);
1217                         IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
1218                 } else {
1219                         if (copied)
1220                                 dev_kfree_skb(skb);
1221                         atomic_inc(&nskb->users);
1222                         skb_queue_tail(&conn->commit_queue, nskb);
1223                 }
1224         }
1225
1226         return rc;
1227 }
1228
1229 /*
1230  * Interface API for upper network layers
1231  */
1232
1233 /**
1234  * Open an interface.
1235  * Called from generic network layer when ifconfig up is run.
1236  *
1237  * @param dev Pointer to interface struct.
1238  *
1239  * @return 0 on success, -ERRNO on failure. (Never fails.)
1240  */
1241 static int netiucv_open(struct net_device *dev)
1242 {
1243         struct netiucv_priv *priv = netdev_priv(dev);
1244
1245         fsm_event(priv->fsm, DEV_EVENT_START, dev);
1246         return 0;
1247 }
1248
1249 /**
1250  * Close an interface.
1251  * Called from generic network layer when ifconfig down is run.
1252  *
1253  * @param dev Pointer to interface struct.
1254  *
1255  * @return 0 on success, -ERRNO on failure. (Never fails.)
1256  */
1257 static int netiucv_close(struct net_device *dev)
1258 {
1259         struct netiucv_priv *priv = netdev_priv(dev);
1260
1261         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
1262         return 0;
1263 }
1264
1265 /**
1266  * Start transmission of a packet.
1267  * Called from generic network device layer.
1268  *
1269  * @param skb Pointer to buffer containing the packet.
1270  * @param dev Pointer to interface struct.
1271  *
1272  * @return 0 if packet consumed, !0 if packet rejected.
1273  *         Note: If we return !0, then the packet is free'd by
1274  *               the generic network layer.
1275  */
1276 static int netiucv_tx(struct sk_buff *skb, struct net_device *dev)
1277 {
1278         struct netiucv_priv *privptr = netdev_priv(dev);
1279         int rc;
1280
1281         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1282         /**
1283          * Some sanity checks ...
1284          */
1285         if (skb == NULL) {
1286                 PRINT_WARN("%s: NULL sk_buff passed\n", dev->name);
1287                 IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n");
1288                 privptr->stats.tx_dropped++;
1289                 return 0;
1290         }
1291         if (skb_headroom(skb) < NETIUCV_HDRLEN) {
1292                 PRINT_WARN("%s: Got sk_buff with head room < %ld bytes\n",
1293                        dev->name, NETIUCV_HDRLEN);
1294                 IUCV_DBF_TEXT(data, 2,
1295                         "netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n");
1296                 dev_kfree_skb(skb);
1297                 privptr->stats.tx_dropped++;
1298                 return 0;
1299         }
1300
1301         /**
1302          * If connection is not running, try to restart it
1303          * and throw away packet.
1304          */
1305         if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
1306                 if (!in_atomic())
1307                         fsm_event(privptr->fsm, DEV_EVENT_START, dev);
1308                 dev_kfree_skb(skb);
1309                 privptr->stats.tx_dropped++;
1310                 privptr->stats.tx_errors++;
1311                 privptr->stats.tx_carrier_errors++;
1312                 return 0;
1313         }
1314
1315         if (netiucv_test_and_set_busy(dev)) {
1316                 IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n");
1317                 return -EBUSY;
1318         }
1319         dev->trans_start = jiffies;
1320         rc = netiucv_transmit_skb(privptr->conn, skb) != 0;
1321         netiucv_clear_busy(dev);
1322         return rc;
1323 }
1324
1325 /**
1326  * netiucv_stats
1327  * @dev: Pointer to interface struct.
1328  *
1329  * Returns interface statistics of a device.
1330  *
1331  * Returns pointer to stats struct of this interface.
1332  */
1333 static struct net_device_stats *netiucv_stats (struct net_device * dev)
1334 {
1335         struct netiucv_priv *priv = netdev_priv(dev);
1336
1337         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1338         return &priv->stats;
1339 }
1340
1341 /**
1342  * netiucv_change_mtu
1343  * @dev: Pointer to interface struct.
1344  * @new_mtu: The new MTU to use for this interface.
1345  *
1346  * Sets MTU of an interface.
1347  *
1348  * Returns 0 on success, -EINVAL if MTU is out of valid range.
1349  *         (valid range is 576 .. NETIUCV_MTU_MAX).
1350  */
1351 static int netiucv_change_mtu(struct net_device * dev, int new_mtu)
1352 {
1353         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1354         if (new_mtu < 576 || new_mtu > NETIUCV_MTU_MAX) {
1355                 IUCV_DBF_TEXT(setup, 2, "given MTU out of valid range\n");
1356                 return -EINVAL;
1357         }
1358         dev->mtu = new_mtu;
1359         return 0;
1360 }
1361
1362 /*
1363  * attributes in sysfs
1364  */
1365
1366 static ssize_t user_show(struct device *dev, struct device_attribute *attr,
1367                          char *buf)
1368 {
1369         struct netiucv_priv *priv = dev->driver_data;
1370
1371         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1372         return sprintf(buf, "%s\n", netiucv_printname(priv->conn->userid));
1373 }
1374
1375 static ssize_t user_write(struct device *dev, struct device_attribute *attr,
1376                           const char *buf, size_t count)
1377 {
1378         struct netiucv_priv *priv = dev->driver_data;
1379         struct net_device *ndev = priv->conn->netdev;
1380         char    *p;
1381         char    *tmp;
1382         char    username[9];
1383         int     i;
1384         struct iucv_connection *cp;
1385
1386         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1387         if (count > 9) {
1388                 PRINT_WARN("netiucv: username too long (%d)!\n", (int) count);
1389                 IUCV_DBF_TEXT_(setup, 2,
1390                                "%d is length of username\n", (int) count);
1391                 return -EINVAL;
1392         }
1393
1394         tmp = strsep((char **) &buf, "\n");
1395         for (i = 0, p = tmp; i < 8 && *p; i++, p++) {
1396                 if (isalnum(*p) || (*p == '$')) {
1397                         username[i]= toupper(*p);
1398                         continue;
1399                 }
1400                 if (*p == '\n') {
1401                         /* trailing lf, grr */
1402                         break;
1403                 }
1404                 PRINT_WARN("netiucv: Invalid char %c in username!\n", *p);
1405                 IUCV_DBF_TEXT_(setup, 2,
1406                                "username: invalid character %c\n", *p);
1407                 return -EINVAL;
1408         }
1409         while (i < 8)
1410                 username[i++] = ' ';
1411         username[8] = '\0';
1412
1413         if (memcmp(username, priv->conn->userid, 9) &&
1414             (ndev->flags & (IFF_UP | IFF_RUNNING))) {
1415                 /* username changed while the interface is active. */
1416                 PRINT_WARN("netiucv: device %s active, connected to %s\n",
1417                            dev->bus_id, priv->conn->userid);
1418                 PRINT_WARN("netiucv: user cannot be updated\n");
1419                 IUCV_DBF_TEXT(setup, 2, "user_write: device active\n");
1420                 return -EBUSY;
1421         }
1422         read_lock_bh(&iucv_connection_rwlock);
1423         list_for_each_entry(cp, &iucv_connection_list, list) {
1424                 if (!strncmp(username, cp->userid, 9) && cp->netdev != ndev) {
1425                         read_unlock_bh(&iucv_connection_rwlock);
1426                         PRINT_WARN("netiucv: Connection to %s already "
1427                                    "exists\n", username);
1428                         return -EEXIST;
1429                 }
1430         }
1431         read_unlock_bh(&iucv_connection_rwlock);
1432         memcpy(priv->conn->userid, username, 9);
1433         return count;
1434 }
1435
1436 static DEVICE_ATTR(user, 0644, user_show, user_write);
1437
1438 static ssize_t buffer_show (struct device *dev, struct device_attribute *attr,
1439                             char *buf)
1440 {       struct netiucv_priv *priv = dev->driver_data;
1441
1442         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1443         return sprintf(buf, "%d\n", priv->conn->max_buffsize);
1444 }
1445
1446 static ssize_t buffer_write (struct device *dev, struct device_attribute *attr,
1447                              const char *buf, size_t count)
1448 {
1449         struct netiucv_priv *priv = dev->driver_data;
1450         struct net_device *ndev = priv->conn->netdev;
1451         char         *e;
1452         int          bs1;
1453
1454         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1455         if (count >= 39)
1456                 return -EINVAL;
1457
1458         bs1 = simple_strtoul(buf, &e, 0);
1459
1460         if (e && (!isspace(*e))) {
1461                 PRINT_WARN("netiucv: Invalid character in buffer!\n");
1462                 IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %c\n", *e);
1463                 return -EINVAL;
1464         }
1465         if (bs1 > NETIUCV_BUFSIZE_MAX) {
1466                 PRINT_WARN("netiucv: Given buffer size %d too large.\n",
1467                         bs1);
1468                 IUCV_DBF_TEXT_(setup, 2,
1469                         "buffer_write: buffer size %d too large\n",
1470                         bs1);
1471                 return -EINVAL;
1472         }
1473         if ((ndev->flags & IFF_RUNNING) &&
1474             (bs1 < (ndev->mtu + NETIUCV_HDRLEN + 2))) {
1475                 PRINT_WARN("netiucv: Given buffer size %d too small.\n",
1476                         bs1);
1477                 IUCV_DBF_TEXT_(setup, 2,
1478                         "buffer_write: buffer size %d too small\n",
1479                         bs1);
1480                 return -EINVAL;
1481         }
1482         if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) {
1483                 PRINT_WARN("netiucv: Given buffer size %d too small.\n",
1484                         bs1);
1485                 IUCV_DBF_TEXT_(setup, 2,
1486                         "buffer_write: buffer size %d too small\n",
1487                         bs1);
1488                 return -EINVAL;
1489         }
1490
1491         priv->conn->max_buffsize = bs1;
1492         if (!(ndev->flags & IFF_RUNNING))
1493                 ndev->mtu = bs1 - NETIUCV_HDRLEN - NETIUCV_HDRLEN;
1494
1495         return count;
1496
1497 }
1498
1499 static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
1500
1501 static ssize_t dev_fsm_show (struct device *dev, struct device_attribute *attr,
1502                              char *buf)
1503 {
1504         struct netiucv_priv *priv = dev->driver_data;
1505
1506         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1507         return sprintf(buf, "%s\n", fsm_getstate_str(priv->fsm));
1508 }
1509
1510 static DEVICE_ATTR(device_fsm_state, 0444, dev_fsm_show, NULL);
1511
1512 static ssize_t conn_fsm_show (struct device *dev,
1513                               struct device_attribute *attr, char *buf)
1514 {
1515         struct netiucv_priv *priv = dev->driver_data;
1516
1517         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1518         return sprintf(buf, "%s\n", fsm_getstate_str(priv->conn->fsm));
1519 }
1520
1521 static DEVICE_ATTR(connection_fsm_state, 0444, conn_fsm_show, NULL);
1522
1523 static ssize_t maxmulti_show (struct device *dev,
1524                               struct device_attribute *attr, char *buf)
1525 {
1526         struct netiucv_priv *priv = dev->driver_data;
1527
1528         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1529         return sprintf(buf, "%ld\n", priv->conn->prof.maxmulti);
1530 }
1531
1532 static ssize_t maxmulti_write (struct device *dev,
1533                                struct device_attribute *attr,
1534                                const char *buf, size_t count)
1535 {
1536         struct netiucv_priv *priv = dev->driver_data;
1537
1538         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1539         priv->conn->prof.maxmulti = 0;
1540         return count;
1541 }
1542
1543 static DEVICE_ATTR(max_tx_buffer_used, 0644, maxmulti_show, maxmulti_write);
1544
1545 static ssize_t maxcq_show (struct device *dev, struct device_attribute *attr,
1546                            char *buf)
1547 {
1548         struct netiucv_priv *priv = dev->driver_data;
1549
1550         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1551         return sprintf(buf, "%ld\n", priv->conn->prof.maxcqueue);
1552 }
1553
1554 static ssize_t maxcq_write (struct device *dev, struct device_attribute *attr,
1555                             const char *buf, size_t count)
1556 {
1557         struct netiucv_priv *priv = dev->driver_data;
1558
1559         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1560         priv->conn->prof.maxcqueue = 0;
1561         return count;
1562 }
1563
1564 static DEVICE_ATTR(max_chained_skbs, 0644, maxcq_show, maxcq_write);
1565
1566 static ssize_t sdoio_show (struct device *dev, struct device_attribute *attr,
1567                            char *buf)
1568 {
1569         struct netiucv_priv *priv = dev->driver_data;
1570
1571         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1572         return sprintf(buf, "%ld\n", priv->conn->prof.doios_single);
1573 }
1574
1575 static ssize_t sdoio_write (struct device *dev, struct device_attribute *attr,
1576                             const char *buf, size_t count)
1577 {
1578         struct netiucv_priv *priv = dev->driver_data;
1579
1580         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1581         priv->conn->prof.doios_single = 0;
1582         return count;
1583 }
1584
1585 static DEVICE_ATTR(tx_single_write_ops, 0644, sdoio_show, sdoio_write);
1586
1587 static ssize_t mdoio_show (struct device *dev, struct device_attribute *attr,
1588                            char *buf)
1589 {
1590         struct netiucv_priv *priv = dev->driver_data;
1591
1592         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1593         return sprintf(buf, "%ld\n", priv->conn->prof.doios_multi);
1594 }
1595
1596 static ssize_t mdoio_write (struct device *dev, struct device_attribute *attr,
1597                             const char *buf, size_t count)
1598 {
1599         struct netiucv_priv *priv = dev->driver_data;
1600
1601         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1602         priv->conn->prof.doios_multi = 0;
1603         return count;
1604 }
1605
1606 static DEVICE_ATTR(tx_multi_write_ops, 0644, mdoio_show, mdoio_write);
1607
1608 static ssize_t txlen_show (struct device *dev, struct device_attribute *attr,
1609                            char *buf)
1610 {
1611         struct netiucv_priv *priv = dev->driver_data;
1612
1613         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1614         return sprintf(buf, "%ld\n", priv->conn->prof.txlen);
1615 }
1616
1617 static ssize_t txlen_write (struct device *dev, struct device_attribute *attr,
1618                             const char *buf, size_t count)
1619 {
1620         struct netiucv_priv *priv = dev->driver_data;
1621
1622         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1623         priv->conn->prof.txlen = 0;
1624         return count;
1625 }
1626
1627 static DEVICE_ATTR(netto_bytes, 0644, txlen_show, txlen_write);
1628
1629 static ssize_t txtime_show (struct device *dev, struct device_attribute *attr,
1630                             char *buf)
1631 {
1632         struct netiucv_priv *priv = dev->driver_data;
1633
1634         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1635         return sprintf(buf, "%ld\n", priv->conn->prof.tx_time);
1636 }
1637
1638 static ssize_t txtime_write (struct device *dev, struct device_attribute *attr,
1639                              const char *buf, size_t count)
1640 {
1641         struct netiucv_priv *priv = dev->driver_data;
1642
1643         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1644         priv->conn->prof.tx_time = 0;
1645         return count;
1646 }
1647
1648 static DEVICE_ATTR(max_tx_io_time, 0644, txtime_show, txtime_write);
1649
1650 static ssize_t txpend_show (struct device *dev, struct device_attribute *attr,
1651                             char *buf)
1652 {
1653         struct netiucv_priv *priv = dev->driver_data;
1654
1655         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1656         return sprintf(buf, "%ld\n", priv->conn->prof.tx_pending);
1657 }
1658
1659 static ssize_t txpend_write (struct device *dev, struct device_attribute *attr,
1660                              const char *buf, size_t count)
1661 {
1662         struct netiucv_priv *priv = dev->driver_data;
1663
1664         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1665         priv->conn->prof.tx_pending = 0;
1666         return count;
1667 }
1668
1669 static DEVICE_ATTR(tx_pending, 0644, txpend_show, txpend_write);
1670
1671 static ssize_t txmpnd_show (struct device *dev, struct device_attribute *attr,
1672                             char *buf)
1673 {
1674         struct netiucv_priv *priv = dev->driver_data;
1675
1676         IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
1677         return sprintf(buf, "%ld\n", priv->conn->prof.tx_max_pending);
1678 }
1679
1680 static ssize_t txmpnd_write (struct device *dev, struct device_attribute *attr,
1681                              const char *buf, size_t count)
1682 {
1683         struct netiucv_priv *priv = dev->driver_data;
1684
1685         IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
1686         priv->conn->prof.tx_max_pending = 0;
1687         return count;
1688 }
1689
1690 static DEVICE_ATTR(tx_max_pending, 0644, txmpnd_show, txmpnd_write);
1691
1692 static struct attribute *netiucv_attrs[] = {
1693         &dev_attr_buffer.attr,
1694         &dev_attr_user.attr,
1695         NULL,
1696 };
1697
1698 static struct attribute_group netiucv_attr_group = {
1699         .attrs = netiucv_attrs,
1700 };
1701
1702 static struct attribute *netiucv_stat_attrs[] = {
1703         &dev_attr_device_fsm_state.attr,
1704         &dev_attr_connection_fsm_state.attr,
1705         &dev_attr_max_tx_buffer_used.attr,
1706         &dev_attr_max_chained_skbs.attr,
1707         &dev_attr_tx_single_write_ops.attr,
1708         &dev_attr_tx_multi_write_ops.attr,
1709         &dev_attr_netto_bytes.attr,
1710         &dev_attr_max_tx_io_time.attr,
1711         &dev_attr_tx_pending.attr,
1712         &dev_attr_tx_max_pending.attr,
1713         NULL,
1714 };
1715
1716 static struct attribute_group netiucv_stat_attr_group = {
1717         .name  = "stats",
1718         .attrs = netiucv_stat_attrs,
1719 };
1720
1721 static int netiucv_add_files(struct device *dev)
1722 {
1723         int ret;
1724
1725         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1726         ret = sysfs_create_group(&dev->kobj, &netiucv_attr_group);
1727         if (ret)
1728                 return ret;
1729         ret = sysfs_create_group(&dev->kobj, &netiucv_stat_attr_group);
1730         if (ret)
1731                 sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
1732         return ret;
1733 }
1734
1735 static void netiucv_remove_files(struct device *dev)
1736 {
1737         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1738         sysfs_remove_group(&dev->kobj, &netiucv_stat_attr_group);
1739         sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
1740 }
1741
1742 static int netiucv_register_device(struct net_device *ndev)
1743 {
1744         struct netiucv_priv *priv = netdev_priv(ndev);
1745         struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1746         int ret;
1747
1748
1749         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1750
1751         if (dev) {
1752                 snprintf(dev->bus_id, BUS_ID_SIZE, "net%s", ndev->name);
1753                 dev->bus = &iucv_bus;
1754                 dev->parent = iucv_root;
1755                 /*
1756                  * The release function could be called after the
1757                  * module has been unloaded. It's _only_ task is to
1758                  * free the struct. Therefore, we specify kfree()
1759                  * directly here. (Probably a little bit obfuscating
1760                  * but legitime ...).
1761                  */
1762                 dev->release = (void (*)(struct device *))kfree;
1763                 dev->driver = &netiucv_driver;
1764         } else
1765                 return -ENOMEM;
1766
1767         ret = device_register(dev);
1768
1769         if (ret)
1770                 return ret;
1771         ret = netiucv_add_files(dev);
1772         if (ret)
1773                 goto out_unreg;
1774         priv->dev = dev;
1775         dev->driver_data = priv;
1776         return 0;
1777
1778 out_unreg:
1779         device_unregister(dev);
1780         return ret;
1781 }
1782
1783 static void netiucv_unregister_device(struct device *dev)
1784 {
1785         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1786         netiucv_remove_files(dev);
1787         device_unregister(dev);
1788 }
1789
1790 /**
1791  * Allocate and initialize a new connection structure.
1792  * Add it to the list of netiucv connections;
1793  */
1794 static struct iucv_connection *netiucv_new_connection(struct net_device *dev,
1795                                                       char *username)
1796 {
1797         struct iucv_connection *conn;
1798
1799         conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1800         if (!conn)
1801                 goto out;
1802         skb_queue_head_init(&conn->collect_queue);
1803         skb_queue_head_init(&conn->commit_queue);
1804         spin_lock_init(&conn->collect_lock);
1805         conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;
1806         conn->netdev = dev;
1807
1808         conn->rx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
1809         if (!conn->rx_buff)
1810                 goto out_conn;
1811         conn->tx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
1812         if (!conn->tx_buff)
1813                 goto out_rx;
1814         conn->fsm = init_fsm("netiucvconn", conn_state_names,
1815                              conn_event_names, NR_CONN_STATES,
1816                              NR_CONN_EVENTS, conn_fsm, CONN_FSM_LEN,
1817                              GFP_KERNEL);
1818         if (!conn->fsm)
1819                 goto out_tx;
1820
1821         fsm_settimer(conn->fsm, &conn->timer);
1822         fsm_newstate(conn->fsm, CONN_STATE_INVALID);
1823
1824         if (username) {
1825                 memcpy(conn->userid, username, 9);
1826                 fsm_newstate(conn->fsm, CONN_STATE_STOPPED);
1827         }
1828
1829         write_lock_bh(&iucv_connection_rwlock);
1830         list_add_tail(&conn->list, &iucv_connection_list);
1831         write_unlock_bh(&iucv_connection_rwlock);
1832         return conn;
1833
1834 out_tx:
1835         kfree_skb(conn->tx_buff);
1836 out_rx:
1837         kfree_skb(conn->rx_buff);
1838 out_conn:
1839         kfree(conn);
1840 out:
1841         return NULL;
1842 }
1843
1844 /**
1845  * Release a connection structure and remove it from the
1846  * list of netiucv connections.
1847  */
1848 static void netiucv_remove_connection(struct iucv_connection *conn)
1849 {
1850         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1851         write_lock_bh(&iucv_connection_rwlock);
1852         list_del_init(&conn->list);
1853         write_unlock_bh(&iucv_connection_rwlock);
1854         fsm_deltimer(&conn->timer);
1855         netiucv_purge_skb_queue(&conn->collect_queue);
1856         if (conn->path) {
1857                 iucv_path_sever(conn->path, iucvMagic);
1858                 kfree(conn->path);
1859                 conn->path = NULL;
1860         }
1861         netiucv_purge_skb_queue(&conn->commit_queue);
1862         kfree_fsm(conn->fsm);
1863         kfree_skb(conn->rx_buff);
1864         kfree_skb(conn->tx_buff);
1865 }
1866
1867 /**
1868  * Release everything of a net device.
1869  */
1870 static void netiucv_free_netdevice(struct net_device *dev)
1871 {
1872         struct netiucv_priv *privptr = netdev_priv(dev);
1873
1874         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1875
1876         if (!dev)
1877                 return;
1878
1879         if (privptr) {
1880                 if (privptr->conn)
1881                         netiucv_remove_connection(privptr->conn);
1882                 if (privptr->fsm)
1883                         kfree_fsm(privptr->fsm);
1884                 privptr->conn = NULL; privptr->fsm = NULL;
1885                 /* privptr gets freed by free_netdev() */
1886         }
1887         free_netdev(dev);
1888 }
1889
1890 /**
1891  * Initialize a net device. (Called from kernel in alloc_netdev())
1892  */
1893 static void netiucv_setup_netdevice(struct net_device *dev)
1894 {
1895         dev->mtu                 = NETIUCV_MTU_DEFAULT;
1896         dev->hard_start_xmit     = netiucv_tx;
1897         dev->open                = netiucv_open;
1898         dev->stop                = netiucv_close;
1899         dev->get_stats           = netiucv_stats;
1900         dev->change_mtu          = netiucv_change_mtu;
1901         dev->destructor          = netiucv_free_netdevice;
1902         dev->hard_header_len     = NETIUCV_HDRLEN;
1903         dev->addr_len            = 0;
1904         dev->type                = ARPHRD_SLIP;
1905         dev->tx_queue_len        = NETIUCV_QUEUELEN_DEFAULT;
1906         dev->flags               = IFF_POINTOPOINT | IFF_NOARP;
1907 }
1908
1909 /**
1910  * Allocate and initialize everything of a net device.
1911  */
1912 static struct net_device *netiucv_init_netdevice(char *username)
1913 {
1914         struct netiucv_priv *privptr;
1915         struct net_device *dev;
1916
1917         dev = alloc_netdev(sizeof(struct netiucv_priv), "iucv%d",
1918                            netiucv_setup_netdevice);
1919         if (!dev)
1920                 return NULL;
1921         if (dev_alloc_name(dev, dev->name) < 0)
1922                 goto out_netdev;
1923
1924         privptr = netdev_priv(dev);
1925         privptr->fsm = init_fsm("netiucvdev", dev_state_names,
1926                                 dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS,
1927                                 dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
1928         if (!privptr->fsm)
1929                 goto out_netdev;
1930
1931         privptr->conn = netiucv_new_connection(dev, username);
1932         if (!privptr->conn) {
1933                 IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n");
1934                 goto out_fsm;
1935         }
1936         fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
1937         return dev;
1938
1939 out_fsm:
1940         kfree_fsm(privptr->fsm);
1941 out_netdev:
1942         free_netdev(dev);
1943         return NULL;
1944 }
1945
1946 static ssize_t conn_write(struct device_driver *drv,
1947                           const char *buf, size_t count)
1948 {
1949         const char *p;
1950         char username[9];
1951         int i, rc;
1952         struct net_device *dev;
1953         struct netiucv_priv *priv;
1954         struct iucv_connection *cp;
1955
1956         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
1957         if (count>9) {
1958                 PRINT_WARN("netiucv: username too long (%d)!\n", (int)count);
1959                 IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n");
1960                 return -EINVAL;
1961         }
1962
1963         for (i = 0, p = buf; i < 8 && *p; i++, p++) {
1964                 if (isalnum(*p) || *p == '$') {
1965                         username[i] = toupper(*p);
1966                         continue;
1967                 }
1968                 if (*p == '\n')
1969                         /* trailing lf, grr */
1970                         break;
1971                 PRINT_WARN("netiucv: Invalid character in username!\n");
1972                 IUCV_DBF_TEXT_(setup, 2,
1973                                "conn_write: invalid character %c\n", *p);
1974                 return -EINVAL;
1975         }
1976         while (i < 8)
1977                 username[i++] = ' ';
1978         username[8] = '\0';
1979
1980         read_lock_bh(&iucv_connection_rwlock);
1981         list_for_each_entry(cp, &iucv_connection_list, list) {
1982                 if (!strncmp(username, cp->userid, 9)) {
1983                         read_unlock_bh(&iucv_connection_rwlock);
1984                         PRINT_WARN("netiucv: Connection to %s already "
1985                                    "exists\n", username);
1986                         return -EEXIST;
1987                 }
1988         }
1989         read_unlock_bh(&iucv_connection_rwlock);
1990
1991         dev = netiucv_init_netdevice(username);
1992         if (!dev) {
1993                 PRINT_WARN("netiucv: Could not allocate network device "
1994                            "structure for user '%s'\n",
1995                            netiucv_printname(username));
1996                 IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n");
1997                 return -ENODEV;
1998         }
1999
2000         rc = netiucv_register_device(dev);
2001         if (rc) {
2002                 IUCV_DBF_TEXT_(setup, 2,
2003                         "ret %d from netiucv_register_device\n", rc);
2004                 goto out_free_ndev;
2005         }
2006
2007         /* sysfs magic */
2008         priv = netdev_priv(dev);
2009         SET_NETDEV_DEV(dev, priv->dev);
2010
2011         rc = register_netdev(dev);
2012         if (rc)
2013                 goto out_unreg;
2014
2015         PRINT_INFO("%s: '%s'\n", dev->name, netiucv_printname(username));
2016
2017         return count;
2018
2019 out_unreg:
2020         netiucv_unregister_device(priv->dev);
2021 out_free_ndev:
2022         PRINT_WARN("netiucv: Could not register '%s'\n", dev->name);
2023         IUCV_DBF_TEXT(setup, 2, "conn_write: could not register\n");
2024         netiucv_free_netdevice(dev);
2025         return rc;
2026 }
2027
2028 static DRIVER_ATTR(connection, 0200, NULL, conn_write);
2029
2030 static ssize_t remove_write (struct device_driver *drv,
2031                              const char *buf, size_t count)
2032 {
2033         struct iucv_connection *cp;
2034         struct net_device *ndev;
2035         struct netiucv_priv *priv;
2036         struct device *dev;
2037         char name[IFNAMSIZ];
2038         const char *p;
2039         int i;
2040
2041         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
2042
2043         if (count >= IFNAMSIZ)
2044                 count = IFNAMSIZ - 1;;
2045
2046         for (i = 0, p = buf; i < count && *p; i++, p++) {
2047                 if (*p == '\n' || *p == ' ')
2048                         /* trailing lf, grr */
2049                         break;
2050                 name[i] = *p;
2051         }
2052         name[i] = '\0';
2053
2054         read_lock_bh(&iucv_connection_rwlock);
2055         list_for_each_entry(cp, &iucv_connection_list, list) {
2056                 ndev = cp->netdev;
2057                 priv = netdev_priv(ndev);
2058                 dev = priv->dev;
2059                 if (strncmp(name, ndev->name, count))
2060                         continue;
2061                 read_unlock_bh(&iucv_connection_rwlock);
2062                 if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
2063                         PRINT_WARN("netiucv: net device %s active with peer "
2064                                    "%s\n", ndev->name, priv->conn->userid);
2065                         PRINT_WARN("netiucv: %s cannot be removed\n",
2066                                    ndev->name);
2067                         IUCV_DBF_TEXT(data, 2, "remove_write: still active\n");
2068                         return -EBUSY;
2069                 }
2070                 unregister_netdev(ndev);
2071                 netiucv_unregister_device(dev);
2072                 return count;
2073         }
2074         read_unlock_bh(&iucv_connection_rwlock);
2075         PRINT_WARN("netiucv: net device %s unknown\n", name);
2076         IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");
2077         return -EINVAL;
2078 }
2079
2080 static DRIVER_ATTR(remove, 0200, NULL, remove_write);
2081
2082 static struct attribute * netiucv_drv_attrs[] = {
2083         &driver_attr_connection.attr,
2084         &driver_attr_remove.attr,
2085         NULL,
2086 };
2087
2088 static struct attribute_group netiucv_drv_attr_group = {
2089         .attrs = netiucv_drv_attrs,
2090 };
2091
2092 static struct attribute_group *netiucv_drv_attr_groups[] = {
2093         &netiucv_drv_attr_group,
2094         NULL,
2095 };
2096
2097 static void netiucv_banner(void)
2098 {
2099         PRINT_INFO("NETIUCV driver initialized\n");
2100 }
2101
2102 static void __exit netiucv_exit(void)
2103 {
2104         struct iucv_connection *cp;
2105         struct net_device *ndev;
2106         struct netiucv_priv *priv;
2107         struct device *dev;
2108
2109         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
2110         while (!list_empty(&iucv_connection_list)) {
2111                 cp = list_entry(iucv_connection_list.next,
2112                                 struct iucv_connection, list);
2113                 ndev = cp->netdev;
2114                 priv = netdev_priv(ndev);
2115                 dev = priv->dev;
2116
2117                 unregister_netdev(ndev);
2118                 netiucv_unregister_device(dev);
2119         }
2120
2121         driver_unregister(&netiucv_driver);
2122         iucv_unregister(&netiucv_handler, 1);
2123         iucv_unregister_dbf_views();
2124
2125         PRINT_INFO("NETIUCV driver unloaded\n");
2126         return;
2127 }
2128
2129 static int __init netiucv_init(void)
2130 {
2131         int rc;
2132
2133         rc = iucv_register_dbf_views();
2134         if (rc)
2135                 goto out;
2136         rc = iucv_register(&netiucv_handler, 1);
2137         if (rc)
2138                 goto out_dbf;
2139         IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
2140         netiucv_driver.groups = netiucv_drv_attr_groups;
2141         rc = driver_register(&netiucv_driver);
2142         if (rc) {
2143                 PRINT_ERR("NETIUCV: failed to register driver.\n");
2144                 IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc);
2145                 goto out_iucv;
2146         }
2147
2148         netiucv_banner();
2149         return rc;
2150
2151 out_iucv:
2152         iucv_unregister(&netiucv_handler, 1);
2153 out_dbf:
2154         iucv_unregister_dbf_views();
2155 out:
2156         return rc;
2157 }
2158
2159 module_init(netiucv_init);
2160 module_exit(netiucv_exit);
2161 MODULE_LICENSE("GPL");