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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / s390 / net / netiucv.c
blob3f85b97ab8d2704820ba1f6f038a99534a14461a
1 /*
2 * IUCV network driver
3 *
4 * Copyright IBM Corp. 2001, 2009
5 *
6 * Author(s):
7 * Original netiucv driver:
8 * Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
9 * Sysfs integration and all bugs therein:
10 * Cornelia Huck (cornelia.huck@de.ibm.com)
11 * PM functions:
12 * Ursula Braun (ursula.braun@de.ibm.com)
13 *
14 * Documentation used:
15 * the source of the original IUCV driver by:
16 * Stefan Hegewald <hegewald@de.ibm.com>
17 * Hartmut Penner <hpenner@de.ibm.com>
18 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
19 * Martin Schwidefsky (schwidefsky@de.ibm.com)
20 * Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
21 *
22 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2, or (at your option)
25 * any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 *
36 */
37
38 #define KMSG_COMPONENT "netiucv"
39 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
40
41 #undef DEBUG
42
43 #include <linux/module.h>
44 #include <linux/init.h>
45 #include <linux/kernel.h>
46 #include <linux/slab.h>
47 #include <linux/errno.h>
48 #include <linux/types.h>
49 #include <linux/interrupt.h>
50 #include <linux/timer.h>
51 #include <linux/bitops.h>
52
53 #include <linux/signal.h>
54 #include <linux/string.h>
55 #include <linux/device.h>
56
57 #include <linux/ip.h>
58 #include <linux/if_arp.h>
59 #include <linux/tcp.h>
60 #include <linux/skbuff.h>
61 #include <linux/ctype.h>
62 #include <net/dst.h>
63
64 #include <asm/io.h>
65 #include <linux/uaccess.h>
66 #include <asm/ebcdic.h>
67
68 #include <net/iucv/iucv.h>
69 #include "fsm.h"
70
71 MODULE_AUTHOR
72 ("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)");
73 MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver");
74
75 /**
76 * Debug Facility stuff
77 */
78 #define IUCV_DBF_SETUP_NAME "iucv_setup"
79 #define IUCV_DBF_SETUP_LEN 64
80 #define IUCV_DBF_SETUP_PAGES 2
81 #define IUCV_DBF_SETUP_NR_AREAS 1
82 #define IUCV_DBF_SETUP_LEVEL 3
83
84 #define IUCV_DBF_DATA_NAME "iucv_data"
85 #define IUCV_DBF_DATA_LEN 128
86 #define IUCV_DBF_DATA_PAGES 2
87 #define IUCV_DBF_DATA_NR_AREAS 1
88 #define IUCV_DBF_DATA_LEVEL 2
89
90 #define IUCV_DBF_TRACE_NAME "iucv_trace"
91 #define IUCV_DBF_TRACE_LEN 16
92 #define IUCV_DBF_TRACE_PAGES 4
93 #define IUCV_DBF_TRACE_NR_AREAS 1
94 #define IUCV_DBF_TRACE_LEVEL 3
95
96 #define IUCV_DBF_TEXT(name,level,text) \
97 do { \
98 debug_text_event(iucv_dbf_##name,level,text); \
99 } while (0)
100
101 #define IUCV_DBF_HEX(name,level,addr,len) \
102 do { \
103 debug_event(iucv_dbf_##name,level,(void*)(addr),len); \
104 } while (0)
105
106 DECLARE_PER_CPU(char[256], iucv_dbf_txt_buf);
107
108 #define IUCV_DBF_TEXT_(name, level, text...) \
109 do { \
110 if (debug_level_enabled(iucv_dbf_##name, level)) { \
111 char* __buf = get_cpu_var(iucv_dbf_txt_buf); \
112 sprintf(__buf, text); \
113 debug_text_event(iucv_dbf_##name, level, __buf); \
114 put_cpu_var(iucv_dbf_txt_buf); \
115 } \
116 } while (0)
117
118 #define IUCV_DBF_SPRINTF(name,level,text...) \
119 do { \
120 debug_sprintf_event(iucv_dbf_trace, level, ##text ); \
121 debug_sprintf_event(iucv_dbf_trace, level, text ); \
122 } while (0)
123
124 /**
125 * some more debug stuff
126 */
127 #define PRINTK_HEADER " iucv: " /* for debugging */
128
129 /* dummy device to make sure netiucv_pm functions are called */
130 static struct device *netiucv_dev;
131
132 static int netiucv_pm_prepare(struct device *);
133 static void netiucv_pm_complete(struct device *);
134 static int netiucv_pm_freeze(struct device *);
135 static int netiucv_pm_restore_thaw(struct device *);
136
137 static const struct dev_pm_ops netiucv_pm_ops = {
138 .prepare = netiucv_pm_prepare,
139 .complete = netiucv_pm_complete,
140 .freeze = netiucv_pm_freeze,
141 .thaw = netiucv_pm_restore_thaw,
142 .restore = netiucv_pm_restore_thaw,
143 };
144
145 static struct device_driver netiucv_driver = {
146 .owner = THIS_MODULE,
147 .name = "netiucv",
148 .bus = &iucv_bus,
149 .pm = &netiucv_pm_ops,
150 };
151
152 static int netiucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
153 static void netiucv_callback_connack(struct iucv_path *, u8 *);
154 static void netiucv_callback_connrej(struct iucv_path *, u8 *);
155 static void netiucv_callback_connsusp(struct iucv_path *, u8 *);
156 static void netiucv_callback_connres(struct iucv_path *, u8 *);
157 static void netiucv_callback_rx(struct iucv_path *, struct iucv_message *);
158 static void netiucv_callback_txdone(struct iucv_path *, struct iucv_message *);
159
160 static struct iucv_handler netiucv_handler = {
161 .path_pending = netiucv_callback_connreq,
162 .path_complete = netiucv_callback_connack,
163 .path_severed = netiucv_callback_connrej,
164 .path_quiesced = netiucv_callback_connsusp,
165 .path_resumed = netiucv_callback_connres,
166 .message_pending = netiucv_callback_rx,
167 .message_complete = netiucv_callback_txdone
168 };
169
170 /**
171 * Per connection profiling data
172 */
173 struct connection_profile {
174 unsigned long maxmulti;
175 unsigned long maxcqueue;
176 unsigned long doios_single;
177 unsigned long doios_multi;
178 unsigned long txlen;
179 unsigned long tx_time;
180 unsigned long send_stamp;
181 unsigned long tx_pending;
182 unsigned long tx_max_pending;
183 };
184
185 /**
186 * Representation of one iucv connection
187 */
188 struct iucv_connection {
189 struct list_head list;
190 struct iucv_path *path;
191 struct sk_buff *rx_buff;
192 struct sk_buff *tx_buff;
193 struct sk_buff_head collect_queue;
194 struct sk_buff_head commit_queue;
195 spinlock_t collect_lock;
196 int collect_len;
197 int max_buffsize;
198 fsm_timer timer;
199 fsm_instance *fsm;
200 struct net_device *netdev;
201 struct connection_profile prof;
202 char userid[9];
203 char userdata[17];
204 };
205
206 /**
207 * Linked list of all connection structs.
208 */
209 static LIST_HEAD(iucv_connection_list);
210 static DEFINE_RWLOCK(iucv_connection_rwlock);
211
212 /**
213 * Representation of event-data for the
214 * connection state machine.
215 */
216 struct iucv_event {
217 struct iucv_connection *conn;
218 void *data;
219 };
220
221 /**
222 * Private part of the network device structure
223 */
224 struct netiucv_priv {
225 struct net_device_stats stats;
226 unsigned long tbusy;
227 fsm_instance *fsm;
228 struct iucv_connection *conn;
229 struct device *dev;
230 int pm_state;
231 };
232
233 /**
234 * Link level header for a packet.
235 */
236 struct ll_header {
237 u16 next;
238 };
239
240 #define NETIUCV_HDRLEN (sizeof(struct ll_header))
241 #define NETIUCV_BUFSIZE_MAX 65537
242 #define NETIUCV_BUFSIZE_DEFAULT NETIUCV_BUFSIZE_MAX
243 #define NETIUCV_MTU_MAX (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN)
244 #define NETIUCV_MTU_DEFAULT 9216
245 #define NETIUCV_QUEUELEN_DEFAULT 50
246 #define NETIUCV_TIMEOUT_5SEC 5000
247
248 /**
249 * Compatibility macros for busy handling
250 * of network devices.
251 */
252 static inline void netiucv_clear_busy(struct net_device *dev)
253 {
254 struct netiucv_priv *priv = netdev_priv(dev);
255 clear_bit(0, &priv->tbusy);
256 netif_wake_queue(dev);
257 }
258
259 static inline int netiucv_test_and_set_busy(struct net_device *dev)
260 {
261 struct netiucv_priv *priv = netdev_priv(dev);
262 netif_stop_queue(dev);
263 return test_and_set_bit(0, &priv->tbusy);
264 }
265
266 static u8 iucvMagic_ascii[16] = {
267 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
268 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
269 };
270
271 static u8 iucvMagic_ebcdic[16] = {
272 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
273 0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
274 };
275
276 /**
277 * Convert an iucv userId to its printable
278 * form (strip whitespace at end).
279 *
280 * @param An iucv userId
281 *
282 * @returns The printable string (static data!!)
283 */
284 static char *netiucv_printname(char *name, int len)
285 {
286 static char tmp[17];
287 char *p = tmp;
288 memcpy(tmp, name, len);
289 tmp[len] = '\0';
290 while (*p && ((p - tmp) < len) && (!isspace(*p)))
291 p++;
292 *p = '\0';
293 return tmp;
294 }
295
296 static char *netiucv_printuser(struct iucv_connection *conn)
297 {
298 static char tmp_uid[9];
299 static char tmp_udat[17];
300 static char buf[100];
301
302 if (memcmp(conn->userdata, iucvMagic_ebcdic, 16)) {
303 tmp_uid[8] = '\0';
304 tmp_udat[16] = '\0';
305 memcpy(tmp_uid, netiucv_printname(conn->userid, 8), 8);
306 memcpy(tmp_udat, conn->userdata, 16);
307 EBCASC(tmp_udat, 16);
308 memcpy(tmp_udat, netiucv_printname(tmp_udat, 16), 16);
309 sprintf(buf, "%s.%s", tmp_uid, tmp_udat);
310 return buf;
311 } else
312 return netiucv_printname(conn->userid, 8);
313 }
314
315 /**
316 * States of the interface statemachine.
317 */
318 enum dev_states {
319 DEV_STATE_STOPPED,
320 DEV_STATE_STARTWAIT,
321 DEV_STATE_STOPWAIT,
322 DEV_STATE_RUNNING,
323 /**
324 * MUST be always the last element!!
325 */
326 NR_DEV_STATES
327 };
328
329 static const char *dev_state_names[] = {
330 "Stopped",
331 "StartWait",
332 "StopWait",
333 "Running",
334 };
335
336 /**
337 * Events of the interface statemachine.
338 */
339 enum dev_events {
340 DEV_EVENT_START,
341 DEV_EVENT_STOP,
342 DEV_EVENT_CONUP,
343 DEV_EVENT_CONDOWN,
344 /**
345 * MUST be always the last element!!
346 */
347 NR_DEV_EVENTS
348 };
349
350 static const char *dev_event_names[] = {
351 "Start",
352 "Stop",
353 "Connection up",
354 "Connection down",
355 };
356
357 /**
358 * Events of the connection statemachine
359 */
360 enum conn_events {
361 /**
362 * Events, representing callbacks from
363 * lowlevel iucv layer)
364 */
365 CONN_EVENT_CONN_REQ,
366 CONN_EVENT_CONN_ACK,
367 CONN_EVENT_CONN_REJ,
368 CONN_EVENT_CONN_SUS,
369 CONN_EVENT_CONN_RES,
370 CONN_EVENT_RX,
371 CONN_EVENT_TXDONE,
372
373 /**
374 * Events, representing errors return codes from
375 * calls to lowlevel iucv layer
376 */
377
378 /**
379 * Event, representing timer expiry.
380 */
381 CONN_EVENT_TIMER,
382
383 /**
384 * Events, representing commands from upper levels.
385 */
386 CONN_EVENT_START,
387 CONN_EVENT_STOP,
388
389 /**
390 * MUST be always the last element!!
391 */
392 NR_CONN_EVENTS,
393 };
394
395 static const char *conn_event_names[] = {
396 "Remote connection request",
397 "Remote connection acknowledge",
398 "Remote connection reject",
399 "Connection suspended",
400 "Connection resumed",
401 "Data received",
402 "Data sent",
403
404 "Timer",
405
406 "Start",
407 "Stop",
408 };
409
410 /**
411 * States of the connection statemachine.
412 */
413 enum conn_states {
414 /**
415 * Connection not assigned to any device,
416 * initial state, invalid
417 */
418 CONN_STATE_INVALID,
419
420 /**
421 * Userid assigned but not operating
422 */
423 CONN_STATE_STOPPED,
424
425 /**
426 * Connection registered,
427 * no connection request sent yet,
428 * no connection request received
429 */
430 CONN_STATE_STARTWAIT,
431
432 /**
433 * Connection registered and connection request sent,
434 * no acknowledge and no connection request received yet.
435 */
436 CONN_STATE_SETUPWAIT,
437
438 /**
439 * Connection up and running idle
440 */
441 CONN_STATE_IDLE,
442
443 /**
444 * Data sent, awaiting CONN_EVENT_TXDONE
445 */
446 CONN_STATE_TX,
447
448 /**
449 * Error during registration.
450 */
451 CONN_STATE_REGERR,
452
453 /**
454 * Error during registration.
455 */
456 CONN_STATE_CONNERR,
457
458 /**
459 * MUST be always the last element!!
460 */
461 NR_CONN_STATES,
462 };
463
464 static const char *conn_state_names[] = {
465 "Invalid",
466 "Stopped",
467 "StartWait",
468 "SetupWait",
469 "Idle",
470 "TX",
471 "Terminating",
472 "Registration error",
473 "Connect error",
474 };
475
476
477 /**
478 * Debug Facility Stuff
479 */
480 static debug_info_t *iucv_dbf_setup = NULL;
481 static debug_info_t *iucv_dbf_data = NULL;
482 static debug_info_t *iucv_dbf_trace = NULL;
483
484 DEFINE_PER_CPU(char[256], iucv_dbf_txt_buf);
485
486 static void iucv_unregister_dbf_views(void)
487 {
488 debug_unregister(iucv_dbf_setup);
489 debug_unregister(iucv_dbf_data);
490 debug_unregister(iucv_dbf_trace);
491 }
492 static int iucv_register_dbf_views(void)
493 {
494 iucv_dbf_setup = debug_register(IUCV_DBF_SETUP_NAME,
495 IUCV_DBF_SETUP_PAGES,
496 IUCV_DBF_SETUP_NR_AREAS,
497 IUCV_DBF_SETUP_LEN);
498 iucv_dbf_data = debug_register(IUCV_DBF_DATA_NAME,
499 IUCV_DBF_DATA_PAGES,
500 IUCV_DBF_DATA_NR_AREAS,
501 IUCV_DBF_DATA_LEN);
502 iucv_dbf_trace = debug_register(IUCV_DBF_TRACE_NAME,
503 IUCV_DBF_TRACE_PAGES,
504 IUCV_DBF_TRACE_NR_AREAS,
505 IUCV_DBF_TRACE_LEN);
506
507 if ((iucv_dbf_setup == NULL) || (iucv_dbf_data == NULL) ||
508 (iucv_dbf_trace == NULL)) {
509 iucv_unregister_dbf_views();
510 return -ENOMEM;
511 }
512 debug_register_view(iucv_dbf_setup, &debug_hex_ascii_view);
513 debug_set_level(iucv_dbf_setup, IUCV_DBF_SETUP_LEVEL);
514
515 debug_register_view(iucv_dbf_data, &debug_hex_ascii_view);
516 debug_set_level(iucv_dbf_data, IUCV_DBF_DATA_LEVEL);
517
518 debug_register_view(iucv_dbf_trace, &debug_hex_ascii_view);
519 debug_set_level(iucv_dbf_trace, IUCV_DBF_TRACE_LEVEL);
520
521 return 0;
522 }
523
524 /*
525 * Callback-wrappers, called from lowlevel iucv layer.
526 */
527
528 static void netiucv_callback_rx(struct iucv_path *path,
529 struct iucv_message *msg)
530 {
531 struct iucv_connection *conn = path->private;
532 struct iucv_event ev;
533
534 ev.conn = conn;
535 ev.data = msg;
536 fsm_event(conn->fsm, CONN_EVENT_RX, &ev);
537 }
538
539 static void netiucv_callback_txdone(struct iucv_path *path,
540 struct iucv_message *msg)
541 {
542 struct iucv_connection *conn = path->private;
543 struct iucv_event ev;
544
545 ev.conn = conn;
546 ev.data = msg;
547 fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev);
548 }
549
550 static void netiucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
551 {
552 struct iucv_connection *conn = path->private;
553
554 fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, conn);
555 }
556
557 static int netiucv_callback_connreq(struct iucv_path *path, u8 *ipvmid,
558 u8 *ipuser)
559 {
560 struct iucv_connection *conn = path->private;
561 struct iucv_event ev;
562 static char tmp_user[9];
563 static char tmp_udat[17];
564 int rc;
565
566 rc = -EINVAL;
567 memcpy(tmp_user, netiucv_printname(ipvmid, 8), 8);
568 memcpy(tmp_udat, ipuser, 16);
569 EBCASC(tmp_udat, 16);
570 read_lock_bh(&iucv_connection_rwlock);
571 list_for_each_entry(conn, &iucv_connection_list, list) {
572 if (strncmp(ipvmid, conn->userid, 8) ||
573 strncmp(ipuser, conn->userdata, 16))
574 continue;
575 /* Found a matching connection for this path. */
576 conn->path = path;
577 ev.conn = conn;
578 ev.data = path;
579 fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev);
580 rc = 0;
581 }
582 IUCV_DBF_TEXT_(setup, 2, "Connection requested for %s.%s\n",
583 tmp_user, netiucv_printname(tmp_udat, 16));
584 read_unlock_bh(&iucv_connection_rwlock);
585 return rc;
586 }
587
588 static void netiucv_callback_connrej(struct iucv_path *path, u8 *ipuser)
589 {
590 struct iucv_connection *conn = path->private;
591
592 fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, conn);
593 }
594
595 static void netiucv_callback_connsusp(struct iucv_path *path, u8 *ipuser)
596 {
597 struct iucv_connection *conn = path->private;
598
599 fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, conn);
600 }
601
602 static void netiucv_callback_connres(struct iucv_path *path, u8 *ipuser)
603 {
604 struct iucv_connection *conn = path->private;
605
606 fsm_event(conn->fsm, CONN_EVENT_CONN_RES, conn);
607 }
608
609 /**
610 * NOP action for statemachines
611 */
612 static void netiucv_action_nop(fsm_instance *fi, int event, void *arg)
613 {
614 }
615
616 /*
617 * Actions of the connection statemachine
618 */
619
620 /**
621 * netiucv_unpack_skb
622 * @conn: The connection where this skb has been received.
623 * @pskb: The received skb.
624 *
625 * Unpack a just received skb and hand it over to upper layers.
626 * Helper function for conn_action_rx.
627 */
628 static void netiucv_unpack_skb(struct iucv_connection *conn,
629 struct sk_buff *pskb)
630 {
631 struct net_device *dev = conn->netdev;
632 struct netiucv_priv *privptr = netdev_priv(dev);
633 u16 offset = 0;
634
635 skb_put(pskb, NETIUCV_HDRLEN);
636 pskb->dev = dev;
637 pskb->ip_summed = CHECKSUM_NONE;
638 pskb->protocol = ntohs(ETH_P_IP);
639
640 while (1) {
641 struct sk_buff *skb;
642 struct ll_header *header = (struct ll_header *) pskb->data;
643
644 if (!header->next)
645 break;
646
647 skb_pull(pskb, NETIUCV_HDRLEN);
648 header->next -= offset;
649 offset += header->next;
650 header->next -= NETIUCV_HDRLEN;
651 if (skb_tailroom(pskb) < header->next) {
652 IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n",
653 header->next, skb_tailroom(pskb));
654 return;
655 }
656 skb_put(pskb, header->next);
657 skb_reset_mac_header(pskb);
658 skb = dev_alloc_skb(pskb->len);
659 if (!skb) {
660 IUCV_DBF_TEXT(data, 2,
661 "Out of memory in netiucv_unpack_skb\n");
662 privptr->stats.rx_dropped++;
663 return;
664 }
665 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
666 pskb->len);
667 skb_reset_mac_header(skb);
668 skb->dev = pskb->dev;
669 skb->protocol = pskb->protocol;
670 pskb->ip_summed = CHECKSUM_UNNECESSARY;
671 privptr->stats.rx_packets++;
672 privptr->stats.rx_bytes += skb->len;
673 /*
674 * Since receiving is always initiated from a tasklet (in iucv.c),
675 * we must use netif_rx_ni() instead of netif_rx()
676 */
677 netif_rx_ni(skb);
678 skb_pull(pskb, header->next);
679 skb_put(pskb, NETIUCV_HDRLEN);
680 }
681 }
682
683 static void conn_action_rx(fsm_instance *fi, int event, void *arg)
684 {
685 struct iucv_event *ev = arg;
686 struct iucv_connection *conn = ev->conn;
687 struct iucv_message *msg = ev->data;
688 struct netiucv_priv *privptr = netdev_priv(conn->netdev);
689 int rc;
690
691 IUCV_DBF_TEXT(trace, 4, __func__);
692
693 if (!conn->netdev) {
694 iucv_message_reject(conn->path, msg);
695 IUCV_DBF_TEXT(data, 2,
696 "Received data for unlinked connection\n");
697 return;
698 }
699 if (msg->length > conn->max_buffsize) {
700 iucv_message_reject(conn->path, msg);
701 privptr->stats.rx_dropped++;
702 IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n",
703 msg->length, conn->max_buffsize);
704 return;
705 }
706 conn->rx_buff->data = conn->rx_buff->head;
707 skb_reset_tail_pointer(conn->rx_buff);
708 conn->rx_buff->len = 0;
709 rc = iucv_message_receive(conn->path, msg, 0, conn->rx_buff->data,
710 msg->length, NULL);
711 if (rc || msg->length < 5) {
712 privptr->stats.rx_errors++;
713 IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_receive\n", rc);
714 return;
715 }
716 netiucv_unpack_skb(conn, conn->rx_buff);
717 }
718
719 static void conn_action_txdone(fsm_instance *fi, int event, void *arg)
720 {
721 struct iucv_event *ev = arg;
722 struct iucv_connection *conn = ev->conn;
723 struct iucv_message *msg = ev->data;
724 struct iucv_message txmsg;
725 struct netiucv_priv *privptr = NULL;
726 u32 single_flag = msg->tag;
727 u32 txbytes = 0;
728 u32 txpackets = 0;
729 u32 stat_maxcq = 0;
730 struct sk_buff *skb;
731 unsigned long saveflags;
732 struct ll_header header;
733 int rc;
734
735 IUCV_DBF_TEXT(trace, 4, __func__);
736
737 if (!conn || !conn->netdev) {
738 IUCV_DBF_TEXT(data, 2,
739 "Send confirmation for unlinked connection\n");
740 return;
741 }
742 privptr = netdev_priv(conn->netdev);
743 conn->prof.tx_pending--;
744 if (single_flag) {
745 if ((skb = skb_dequeue(&conn->commit_queue))) {
746 atomic_dec(&skb->users);
747 if (privptr) {
748 privptr->stats.tx_packets++;
749 privptr->stats.tx_bytes +=
750 (skb->len - NETIUCV_HDRLEN
751 - NETIUCV_HDRLEN);
752 }
753 dev_kfree_skb_any(skb);
754 }
755 }
756 conn->tx_buff->data = conn->tx_buff->head;
757 skb_reset_tail_pointer(conn->tx_buff);
758 conn->tx_buff->len = 0;
759 spin_lock_irqsave(&conn->collect_lock, saveflags);
760 while ((skb = skb_dequeue(&conn->collect_queue))) {
761 header.next = conn->tx_buff->len + skb->len + NETIUCV_HDRLEN;
762 memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
763 NETIUCV_HDRLEN);
764 skb_copy_from_linear_data(skb,
765 skb_put(conn->tx_buff, skb->len),
766 skb->len);
767 txbytes += skb->len;
768 txpackets++;
769 stat_maxcq++;
770 atomic_dec(&skb->users);
771 dev_kfree_skb_any(skb);
772 }
773 if (conn->collect_len > conn->prof.maxmulti)
774 conn->prof.maxmulti = conn->collect_len;
775 conn->collect_len = 0;
776 spin_unlock_irqrestore(&conn->collect_lock, saveflags);
777 if (conn->tx_buff->len == 0) {
778 fsm_newstate(fi, CONN_STATE_IDLE);
779 return;
780 }
781
782 header.next = 0;
783 memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
784 conn->prof.send_stamp = jiffies;
785 txmsg.class = 0;
786 txmsg.tag = 0;
787 rc = iucv_message_send(conn->path, &txmsg, 0, 0,
788 conn->tx_buff->data, conn->tx_buff->len);
789 conn->prof.doios_multi++;
790 conn->prof.txlen += conn->tx_buff->len;
791 conn->prof.tx_pending++;
792 if (conn->prof.tx_pending > conn->prof.tx_max_pending)
793 conn->prof.tx_max_pending = conn->prof.tx_pending;
794 if (rc) {
795 conn->prof.tx_pending--;
796 fsm_newstate(fi, CONN_STATE_IDLE);
797 if (privptr)
798 privptr->stats.tx_errors += txpackets;
799 IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
800 } else {
801 if (privptr) {
802 privptr->stats.tx_packets += txpackets;
803 privptr->stats.tx_bytes += txbytes;
804 }
805 if (stat_maxcq > conn->prof.maxcqueue)
806 conn->prof.maxcqueue = stat_maxcq;
807 }
808 }
809
810 static void conn_action_connaccept(fsm_instance *fi, int event, void *arg)
811 {
812 struct iucv_event *ev = arg;
813 struct iucv_connection *conn = ev->conn;
814 struct iucv_path *path = ev->data;
815 struct net_device *netdev = conn->netdev;
816 struct netiucv_priv *privptr = netdev_priv(netdev);
817 int rc;
818
819 IUCV_DBF_TEXT(trace, 3, __func__);
820
821 conn->path = path;
822 path->msglim = NETIUCV_QUEUELEN_DEFAULT;
823 path->flags = 0;
824 rc = iucv_path_accept(path, &netiucv_handler, conn->userdata , conn);
825 if (rc) {
826 IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc);
827 return;
828 }
829 fsm_newstate(fi, CONN_STATE_IDLE);
830 netdev->tx_queue_len = conn->path->msglim;
831 fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
832 }
833
834 static void conn_action_connreject(fsm_instance *fi, int event, void *arg)
835 {
836 struct iucv_event *ev = arg;
837 struct iucv_path *path = ev->data;
838
839 IUCV_DBF_TEXT(trace, 3, __func__);
840 iucv_path_sever(path, NULL);
841 }
842
843 static void conn_action_connack(fsm_instance *fi, int event, void *arg)
844 {
845 struct iucv_connection *conn = arg;
846 struct net_device *netdev = conn->netdev;
847 struct netiucv_priv *privptr = netdev_priv(netdev);
848
849 IUCV_DBF_TEXT(trace, 3, __func__);
850 fsm_deltimer(&conn->timer);
851 fsm_newstate(fi, CONN_STATE_IDLE);
852 netdev->tx_queue_len = conn->path->msglim;
853 fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
854 }
855
856 static void conn_action_conntimsev(fsm_instance *fi, int event, void *arg)
857 {
858 struct iucv_connection *conn = arg;
859
860 IUCV_DBF_TEXT(trace, 3, __func__);
861 fsm_deltimer(&conn->timer);
862 iucv_path_sever(conn->path, conn->userdata);
863 fsm_newstate(fi, CONN_STATE_STARTWAIT);
864 }
865
866 static void conn_action_connsever(fsm_instance *fi, int event, void *arg)
867 {
868 struct iucv_connection *conn = arg;
869 struct net_device *netdev = conn->netdev;
870 struct netiucv_priv *privptr = netdev_priv(netdev);
871
872 IUCV_DBF_TEXT(trace, 3, __func__);
873
874 fsm_deltimer(&conn->timer);
875 iucv_path_sever(conn->path, conn->userdata);
876 dev_info(privptr->dev, "The peer z/VM guest %s has closed the "
877 "connection\n", netiucv_printuser(conn));
878 IUCV_DBF_TEXT(data, 2,
879 "conn_action_connsever: Remote dropped connection\n");
880 fsm_newstate(fi, CONN_STATE_STARTWAIT);
881 fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
882 }
883
884 static void conn_action_start(fsm_instance *fi, int event, void *arg)
885 {
886 struct iucv_connection *conn = arg;
887 struct net_device *netdev = conn->netdev;
888 struct netiucv_priv *privptr = netdev_priv(netdev);
889 int rc;
890
891 IUCV_DBF_TEXT(trace, 3, __func__);
892
893 fsm_newstate(fi, CONN_STATE_STARTWAIT);
894
895 /*
896 * We must set the state before calling iucv_connect because the
897 * callback handler could be called at any point after the connection
898 * request is sent
899 */
900
901 fsm_newstate(fi, CONN_STATE_SETUPWAIT);
902 conn->path = iucv_path_alloc(NETIUCV_QUEUELEN_DEFAULT, 0, GFP_KERNEL);
903 IUCV_DBF_TEXT_(setup, 2, "%s: connecting to %s ...\n",
904 netdev->name, netiucv_printuser(conn));
905
906 rc = iucv_path_connect(conn->path, &netiucv_handler, conn->userid,
907 NULL, conn->userdata, conn);
908 switch (rc) {
909 case 0:
910 netdev->tx_queue_len = conn->path->msglim;
911 fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC,
912 CONN_EVENT_TIMER, conn);
913 return;
914 case 11:
915 dev_warn(privptr->dev,
916 "The IUCV device failed to connect to z/VM guest %s\n",
917 netiucv_printname(conn->userid, 8));
918 fsm_newstate(fi, CONN_STATE_STARTWAIT);
919 break;
920 case 12:
921 dev_warn(privptr->dev,
922 "The IUCV device failed to connect to the peer on z/VM"
923 " guest %s\n", netiucv_printname(conn->userid, 8));
924 fsm_newstate(fi, CONN_STATE_STARTWAIT);
925 break;
926 case 13:
927 dev_err(privptr->dev,
928 "Connecting the IUCV device would exceed the maximum"
929 " number of IUCV connections\n");
930 fsm_newstate(fi, CONN_STATE_CONNERR);
931 break;
932 case 14:
933 dev_err(privptr->dev,
934 "z/VM guest %s has too many IUCV connections"
935 " to connect with the IUCV device\n",
936 netiucv_printname(conn->userid, 8));
937 fsm_newstate(fi, CONN_STATE_CONNERR);
938 break;
939 case 15:
940 dev_err(privptr->dev,
941 "The IUCV device cannot connect to a z/VM guest with no"
942 " IUCV authorization\n");
943 fsm_newstate(fi, CONN_STATE_CONNERR);
944 break;
945 default:
946 dev_err(privptr->dev,
947 "Connecting the IUCV device failed with error %d\n",
948 rc);
949 fsm_newstate(fi, CONN_STATE_CONNERR);
950 break;
951 }
952 IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc);
953 kfree(conn->path);
954 conn->path = NULL;
955 }
956
957 static void netiucv_purge_skb_queue(struct sk_buff_head *q)
958 {
959 struct sk_buff *skb;
960
961 while ((skb = skb_dequeue(q))) {
962 atomic_dec(&skb->users);
963 dev_kfree_skb_any(skb);
964 }
965 }
966
967 static void conn_action_stop(fsm_instance *fi, int event, void *arg)
968 {
969 struct iucv_event *ev = arg;
970 struct iucv_connection *conn = ev->conn;
971 struct net_device *netdev = conn->netdev;
972 struct netiucv_priv *privptr = netdev_priv(netdev);
973
974 IUCV_DBF_TEXT(trace, 3, __func__);
975
976 fsm_deltimer(&conn->timer);
977 fsm_newstate(fi, CONN_STATE_STOPPED);
978 netiucv_purge_skb_queue(&conn->collect_queue);
979 if (conn->path) {
980 IUCV_DBF_TEXT(trace, 5, "calling iucv_path_sever\n");
981 iucv_path_sever(conn->path, conn->userdata);
982 kfree(conn->path);
983 conn->path = NULL;
984 }
985 netiucv_purge_skb_queue(&conn->commit_queue);
986 fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
987 }
988
989 static void conn_action_inval(fsm_instance *fi, int event, void *arg)
990 {
991 struct iucv_connection *conn = arg;
992 struct net_device *netdev = conn->netdev;
993
994 IUCV_DBF_TEXT_(data, 2, "%s('%s'): conn_action_inval called\n",
995 netdev->name, conn->userid);
996 }
997
998 static const fsm_node conn_fsm[] = {
999 { CONN_STATE_INVALID, CONN_EVENT_START, conn_action_inval },
1000 { CONN_STATE_STOPPED, CONN_EVENT_START, conn_action_start },
1001
1002 { CONN_STATE_STOPPED, CONN_EVENT_STOP, conn_action_stop },
1003 { CONN_STATE_STARTWAIT, CONN_EVENT_STOP, conn_action_stop },
1004 { CONN_STATE_SETUPWAIT, CONN_EVENT_STOP, conn_action_stop },
1005 { CONN_STATE_IDLE, CONN_EVENT_STOP, conn_action_stop },
1006 { CONN_STATE_TX, CONN_EVENT_STOP, conn_action_stop },
1007 { CONN_STATE_REGERR, CONN_EVENT_STOP, conn_action_stop },
1008 { CONN_STATE_CONNERR, CONN_EVENT_STOP, conn_action_stop },
1009
1010 { CONN_STATE_STOPPED, CONN_EVENT_CONN_REQ, conn_action_connreject },
1011 { CONN_STATE_STARTWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
1012 { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
1013 { CONN_STATE_IDLE, CONN_EVENT_CONN_REQ, conn_action_connreject },
1014 { CONN_STATE_TX, CONN_EVENT_CONN_REQ, conn_action_connreject },
1015
1016 { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_ACK, conn_action_connack },
1017 { CONN_STATE_SETUPWAIT, CONN_EVENT_TIMER, conn_action_conntimsev },
1018
1019 { CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REJ, conn_action_connsever },
1020 { CONN_STATE_IDLE, CONN_EVENT_CONN_REJ, conn_action_connsever },
1021 { CONN_STATE_TX, CONN_EVENT_CONN_REJ, conn_action_connsever },
1022
1023 { CONN_STATE_IDLE, CONN_EVENT_RX, conn_action_rx },
1024 { CONN_STATE_TX, CONN_EVENT_RX, conn_action_rx },
1025
1026 { CONN_STATE_TX, CONN_EVENT_TXDONE, conn_action_txdone },
1027 { CONN_STATE_IDLE, CONN_EVENT_TXDONE, conn_action_txdone },
1028 };
1029
1030 static const int CONN_FSM_LEN = sizeof(conn_fsm) / sizeof(fsm_node);
1031
1032
1033 /*
1034 * Actions for interface - statemachine.
1035 */
1036
1037 /**
1038 * dev_action_start
1039 * @fi: An instance of an interface statemachine.
1040 * @event: The event, just happened.
1041 * @arg: Generic pointer, casted from struct net_device * upon call.
1042 *
1043 * Startup connection by sending CONN_EVENT_START to it.
1044 */
1045 static void dev_action_start(fsm_instance *fi, int event, void *arg)
1046 {
1047 struct net_device *dev = arg;
1048 struct netiucv_priv *privptr = netdev_priv(dev);
1049
1050 IUCV_DBF_TEXT(trace, 3, __func__);
1051
1052 fsm_newstate(fi, DEV_STATE_STARTWAIT);
1053 fsm_event(privptr->conn->fsm, CONN_EVENT_START, privptr->conn);
1054 }
1055
1056 /**
1057 * Shutdown connection by sending CONN_EVENT_STOP to it.
1058 *
1059 * @param fi An instance of an interface statemachine.
1060 * @param event The event, just happened.
1061 * @param arg Generic pointer, casted from struct net_device * upon call.
1062 */
1063 static void
1064 dev_action_stop(fsm_instance *fi, int event, void *arg)
1065 {
1066 struct net_device *dev = arg;
1067 struct netiucv_priv *privptr = netdev_priv(dev);
1068 struct iucv_event ev;
1069
1070 IUCV_DBF_TEXT(trace, 3, __func__);
1071
1072 ev.conn = privptr->conn;
1073
1074 fsm_newstate(fi, DEV_STATE_STOPWAIT);
1075 fsm_event(privptr->conn->fsm, CONN_EVENT_STOP, &ev);
1076 }
1077
1078 /**
1079 * Called from connection statemachine
1080 * when a connection is up and running.
1081 *
1082 * @param fi An instance of an interface statemachine.
1083 * @param event The event, just happened.
1084 * @param arg Generic pointer, casted from struct net_device * upon call.
1085 */
1086 static void
1087 dev_action_connup(fsm_instance *fi, int event, void *arg)
1088 {
1089 struct net_device *dev = arg;
1090 struct netiucv_priv *privptr = netdev_priv(dev);
1091
1092 IUCV_DBF_TEXT(trace, 3, __func__);
1093
1094 switch (fsm_getstate(fi)) {
1095 case DEV_STATE_STARTWAIT:
1096 fsm_newstate(fi, DEV_STATE_RUNNING);
1097 dev_info(privptr->dev,
1098 "The IUCV device has been connected"
1099 " successfully to %s\n",
1100 netiucv_printuser(privptr->conn));
1101 IUCV_DBF_TEXT(setup, 3,
1102 "connection is up and running\n");
1103 break;
1104 case DEV_STATE_STOPWAIT:
1105 IUCV_DBF_TEXT(data, 2,
1106 "dev_action_connup: in DEV_STATE_STOPWAIT\n");
1107 break;
1108 }
1109 }
1110
1111 /**
1112 * Called from connection statemachine
1113 * when a connection has been shutdown.
1114 *
1115 * @param fi An instance of an interface statemachine.
1116 * @param event The event, just happened.
1117 * @param arg Generic pointer, casted from struct net_device * upon call.
1118 */
1119 static void
1120 dev_action_conndown(fsm_instance *fi, int event, void *arg)
1121 {
1122 IUCV_DBF_TEXT(trace, 3, __func__);
1123
1124 switch (fsm_getstate(fi)) {
1125 case DEV_STATE_RUNNING:
1126 fsm_newstate(fi, DEV_STATE_STARTWAIT);
1127 break;
1128 case DEV_STATE_STOPWAIT:
1129 fsm_newstate(fi, DEV_STATE_STOPPED);
1130 IUCV_DBF_TEXT(setup, 3, "connection is down\n");
1131 break;
1132 }
1133 }
1134
1135 static const fsm_node dev_fsm[] = {
1136 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
1137
1138 { DEV_STATE_STOPWAIT, DEV_EVENT_START, dev_action_start },
1139 { DEV_STATE_STOPWAIT, DEV_EVENT_CONDOWN, dev_action_conndown },
1140
1141 { DEV_STATE_STARTWAIT, DEV_EVENT_STOP, dev_action_stop },
1142 { DEV_STATE_STARTWAIT, DEV_EVENT_CONUP, dev_action_connup },
1143
1144 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
1145 { DEV_STATE_RUNNING, DEV_EVENT_CONDOWN, dev_action_conndown },
1146 { DEV_STATE_RUNNING, DEV_EVENT_CONUP, netiucv_action_nop },
1147 };
1148
1149 static const int DEV_FSM_LEN = sizeof(dev_fsm) / sizeof(fsm_node);
1150
1151 /**
1152 * Transmit a packet.
1153 * This is a helper function for netiucv_tx().
1154 *
1155 * @param conn Connection to be used for sending.
1156 * @param skb Pointer to struct sk_buff of packet to send.
1157 * The linklevel header has already been set up
1158 * by netiucv_tx().
1159 *
1160 * @return 0 on success, -ERRNO on failure. (Never fails.)
1161 */
1162 static int netiucv_transmit_skb(struct iucv_connection *conn,
1163 struct sk_buff *skb)
1164 {
1165 struct iucv_message msg;
1166 unsigned long saveflags;
1167 struct ll_header header;
1168 int rc;
1169
1170 if (fsm_getstate(conn->fsm) != CONN_STATE_IDLE) {
1171 int l = skb->len + NETIUCV_HDRLEN;
1172
1173 spin_lock_irqsave(&conn->collect_lock, saveflags);
1174 if (conn->collect_len + l >
1175 (conn->max_buffsize - NETIUCV_HDRLEN)) {
1176 rc = -EBUSY;
1177 IUCV_DBF_TEXT(data, 2,
1178 "EBUSY from netiucv_transmit_skb\n");
1179 } else {
1180 atomic_inc(&skb->users);
1181 skb_queue_tail(&conn->collect_queue, skb);
1182 conn->collect_len += l;
1183 rc = 0;
1184 }
1185 spin_unlock_irqrestore(&conn->collect_lock, saveflags);
1186 } else {
1187 struct sk_buff *nskb = skb;
1188 /**
1189 * Copy the skb to a new allocated skb in lowmem only if the
1190 * data is located above 2G in memory or tailroom is < 2.
1191 */
1192 unsigned long hi = ((unsigned long)(skb_tail_pointer(skb) +
1193 NETIUCV_HDRLEN)) >> 31;
1194 int copied = 0;
1195 if (hi || (skb_tailroom(skb) < 2)) {
1196 nskb = alloc_skb(skb->len + NETIUCV_HDRLEN +
1197 NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA);
1198 if (!nskb) {
1199 IUCV_DBF_TEXT(data, 2, "alloc_skb failed\n");
1200 rc = -ENOMEM;
1201 return rc;
1202 } else {
1203 skb_reserve(nskb, NETIUCV_HDRLEN);
1204 memcpy(skb_put(nskb, skb->len),
1205 skb->data, skb->len);
1206 }
1207 copied = 1;
1208 }
1209 /**
1210 * skb now is below 2G and has enough room. Add headers.
1211 */
1212 header.next = nskb->len + NETIUCV_HDRLEN;
1213 memcpy(skb_push(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
1214 header.next = 0;
1215 memcpy(skb_put(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
1216
1217 fsm_newstate(conn->fsm, CONN_STATE_TX);
1218 conn->prof.send_stamp = jiffies;
1219
1220 msg.tag = 1;
1221 msg.class = 0;
1222 rc = iucv_message_send(conn->path, &msg, 0, 0,
1223 nskb->data, nskb->len);
1224 conn->prof.doios_single++;
1225 conn->prof.txlen += skb->len;
1226 conn->prof.tx_pending++;
1227 if (conn->prof.tx_pending > conn->prof.tx_max_pending)
1228 conn->prof.tx_max_pending = conn->prof.tx_pending;
1229 if (rc) {
1230 struct netiucv_priv *privptr;
1231 fsm_newstate(conn->fsm, CONN_STATE_IDLE);
1232 conn->prof.tx_pending--;
1233 privptr = netdev_priv(conn->netdev);
1234 if (privptr)
1235 privptr->stats.tx_errors++;
1236 if (copied)
1237 dev_kfree_skb(nskb);
1238 else {
1239 /**
1240 * Remove our headers. They get added
1241 * again on retransmit.
1242 */
1243 skb_pull(skb, NETIUCV_HDRLEN);
1244 skb_trim(skb, skb->len - NETIUCV_HDRLEN);
1245 }
1246 IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
1247 } else {
1248 if (copied)
1249 dev_kfree_skb(skb);
1250 atomic_inc(&nskb->users);
1251 skb_queue_tail(&conn->commit_queue, nskb);
1252 }
1253 }
1254
1255 return rc;
1256 }
1257
1258 /*
1259 * Interface API for upper network layers
1260 */
1261
1262 /**
1263 * Open an interface.
1264 * Called from generic network layer when ifconfig up is run.
1265 *
1266 * @param dev Pointer to interface struct.
1267 *
1268 * @return 0 on success, -ERRNO on failure. (Never fails.)
1269 */
1270 static int netiucv_open(struct net_device *dev)
1271 {
1272 struct netiucv_priv *priv = netdev_priv(dev);
1273
1274 fsm_event(priv->fsm, DEV_EVENT_START, dev);
1275 return 0;
1276 }
1277
1278 /**
1279 * Close an interface.
1280 * Called from generic network layer when ifconfig down is run.
1281 *
1282 * @param dev Pointer to interface struct.
1283 *
1284 * @return 0 on success, -ERRNO on failure. (Never fails.)
1285 */
1286 static int netiucv_close(struct net_device *dev)
1287 {
1288 struct netiucv_priv *priv = netdev_priv(dev);
1289
1290 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
1291 return 0;
1292 }
1293
1294 static int netiucv_pm_prepare(struct device *dev)
1295 {
1296 IUCV_DBF_TEXT(trace, 3, __func__);
1297 return 0;
1298 }
1299
1300 static void netiucv_pm_complete(struct device *dev)
1301 {
1302 IUCV_DBF_TEXT(trace, 3, __func__);
1303 return;
1304 }
1305
1306 /**
1307 * netiucv_pm_freeze() - Freeze PM callback
1308 * @dev: netiucv device
1309 *
1310 * close open netiucv interfaces
1311 */
1312 static int netiucv_pm_freeze(struct device *dev)
1313 {
1314 struct netiucv_priv *priv = dev_get_drvdata(dev);
1315 struct net_device *ndev = NULL;
1316 int rc = 0;
1317
1318 IUCV_DBF_TEXT(trace, 3, __func__);
1319 if (priv && priv->conn)
1320 ndev = priv->conn->netdev;
1321 if (!ndev)
1322 goto out;
1323 netif_device_detach(ndev);
1324 priv->pm_state = fsm_getstate(priv->fsm);
1325 rc = netiucv_close(ndev);
1326 out:
1327 return rc;
1328 }
1329
1330 /**
1331 * netiucv_pm_restore_thaw() - Thaw and restore PM callback
1332 * @dev: netiucv device
1333 *
1334 * re-open netiucv interfaces closed during freeze
1335 */
1336 static int netiucv_pm_restore_thaw(struct device *dev)
1337 {
1338 struct netiucv_priv *priv = dev_get_drvdata(dev);
1339 struct net_device *ndev = NULL;
1340 int rc = 0;
1341
1342 IUCV_DBF_TEXT(trace, 3, __func__);
1343 if (priv && priv->conn)
1344 ndev = priv->conn->netdev;
1345 if (!ndev)
1346 goto out;
1347 switch (priv->pm_state) {
1348 case DEV_STATE_RUNNING:
1349 case DEV_STATE_STARTWAIT:
1350 rc = netiucv_open(ndev);
1351 break;
1352 default:
1353 break;
1354 }
1355 netif_device_attach(ndev);
1356 out:
1357 return rc;
1358 }
1359
1360 /**
1361 * Start transmission of a packet.
1362 * Called from generic network device layer.
1363 *
1364 * @param skb Pointer to buffer containing the packet.
1365 * @param dev Pointer to interface struct.
1366 *
1367 * @return 0 if packet consumed, !0 if packet rejected.
1368 * Note: If we return !0, then the packet is free'd by
1369 * the generic network layer.
1370 */
1371 static int netiucv_tx(struct sk_buff *skb, struct net_device *dev)
1372 {
1373 struct netiucv_priv *privptr = netdev_priv(dev);
1374 int rc;
1375
1376 IUCV_DBF_TEXT(trace, 4, __func__);
1377 /**
1378 * Some sanity checks ...
1379 */
1380 if (skb == NULL) {
1381 IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n");
1382 privptr->stats.tx_dropped++;
1383 return NETDEV_TX_OK;
1384 }
1385 if (skb_headroom(skb) < NETIUCV_HDRLEN) {
1386 IUCV_DBF_TEXT(data, 2,
1387 "netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n");
1388 dev_kfree_skb(skb);
1389 privptr->stats.tx_dropped++;
1390 return NETDEV_TX_OK;
1391 }
1392
1393 /**
1394 * If connection is not running, try to restart it
1395 * and throw away packet.
1396 */
1397 if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
1398 dev_kfree_skb(skb);
1399 privptr->stats.tx_dropped++;
1400 privptr->stats.tx_errors++;
1401 privptr->stats.tx_carrier_errors++;
1402 return NETDEV_TX_OK;
1403 }
1404
1405 if (netiucv_test_and_set_busy(dev)) {
1406 IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n");
1407 return NETDEV_TX_BUSY;
1408 }
1409 netif_trans_update(dev);
1410 rc = netiucv_transmit_skb(privptr->conn, skb);
1411 netiucv_clear_busy(dev);
1412 return rc ? NETDEV_TX_BUSY : NETDEV_TX_OK;
1413 }
1414
1415 /**
1416 * netiucv_stats
1417 * @dev: Pointer to interface struct.
1418 *
1419 * Returns interface statistics of a device.
1420 *
1421 * Returns pointer to stats struct of this interface.
1422 */
1423 static struct net_device_stats *netiucv_stats (struct net_device * dev)
1424 {
1425 struct netiucv_priv *priv = netdev_priv(dev);
1426
1427 IUCV_DBF_TEXT(trace, 5, __func__);
1428 return &priv->stats;
1429 }
1430
1431 /*
1432 * attributes in sysfs
1433 */
1434
1435 static ssize_t user_show(struct device *dev, struct device_attribute *attr,
1436 char *buf)
1437 {
1438 struct netiucv_priv *priv = dev_get_drvdata(dev);
1439
1440 IUCV_DBF_TEXT(trace, 5, __func__);
1441 return sprintf(buf, "%s\n", netiucv_printuser(priv->conn));
1442 }
1443
1444 static int netiucv_check_user(const char *buf, size_t count, char *username,
1445 char *userdata)
1446 {
1447 const char *p;
1448 int i;
1449
1450 p = strchr(buf, '.');
1451 if ((p && ((count > 26) ||
1452 ((p - buf) > 8) ||
1453 (buf + count - p > 18))) ||
1454 (!p && (count > 9))) {
1455 IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n");
1456 return -EINVAL;
1457 }
1458
1459 for (i = 0, p = buf; i < 8 && *p && *p != '.'; i++, p++) {
1460 if (isalnum(*p) || *p == '$') {
1461 username[i] = toupper(*p);
1462 continue;
1463 }
1464 if (*p == '\n')
1465 /* trailing lf, grr */
1466 break;
1467 IUCV_DBF_TEXT_(setup, 2,
1468 "conn_write: invalid character %02x\n", *p);
1469 return -EINVAL;
1470 }
1471 while (i < 8)
1472 username[i++] = ' ';
1473 username[8] = '\0';
1474
1475 if (*p == '.') {
1476 p++;
1477 for (i = 0; i < 16 && *p; i++, p++) {
1478 if (*p == '\n')
1479 break;
1480 userdata[i] = toupper(*p);
1481 }
1482 while (i > 0 && i < 16)
1483 userdata[i++] = ' ';
1484 } else
1485 memcpy(userdata, iucvMagic_ascii, 16);
1486 userdata[16] = '\0';
1487 ASCEBC(userdata, 16);
1488
1489 return 0;
1490 }
1491
1492 static ssize_t user_write(struct device *dev, struct device_attribute *attr,
1493 const char *buf, size_t count)
1494 {
1495 struct netiucv_priv *priv = dev_get_drvdata(dev);
1496 struct net_device *ndev = priv->conn->netdev;
1497 char username[9];
1498 char userdata[17];
1499 int rc;
1500 struct iucv_connection *cp;
1501
1502 IUCV_DBF_TEXT(trace, 3, __func__);
1503 rc = netiucv_check_user(buf, count, username, userdata);
1504 if (rc)
1505 return rc;
1506
1507 if (memcmp(username, priv->conn->userid, 9) &&
1508 (ndev->flags & (IFF_UP | IFF_RUNNING))) {
1509 /* username changed while the interface is active. */
1510 IUCV_DBF_TEXT(setup, 2, "user_write: device active\n");
1511 return -EPERM;
1512 }
1513 read_lock_bh(&iucv_connection_rwlock);
1514 list_for_each_entry(cp, &iucv_connection_list, list) {
1515 if (!strncmp(username, cp->userid, 9) &&
1516 !strncmp(userdata, cp->userdata, 17) && cp->netdev != ndev) {
1517 read_unlock_bh(&iucv_connection_rwlock);
1518 IUCV_DBF_TEXT_(setup, 2, "user_write: Connection to %s "
1519 "already exists\n", netiucv_printuser(cp));
1520 return -EEXIST;
1521 }
1522 }
1523 read_unlock_bh(&iucv_connection_rwlock);
1524 memcpy(priv->conn->userid, username, 9);
1525 memcpy(priv->conn->userdata, userdata, 17);
1526 return count;
1527 }
1528
1529 static DEVICE_ATTR(user, 0644, user_show, user_write);
1530
1531 static ssize_t buffer_show (struct device *dev, struct device_attribute *attr,
1532 char *buf)
1533 {
1534 struct netiucv_priv *priv = dev_get_drvdata(dev);
1535
1536 IUCV_DBF_TEXT(trace, 5, __func__);
1537 return sprintf(buf, "%d\n", priv->conn->max_buffsize);
1538 }
1539
1540 static ssize_t buffer_write (struct device *dev, struct device_attribute *attr,
1541 const char *buf, size_t count)
1542 {
1543 struct netiucv_priv *priv = dev_get_drvdata(dev);
1544 struct net_device *ndev = priv->conn->netdev;
1545 unsigned int bs1;
1546 int rc;
1547
1548 IUCV_DBF_TEXT(trace, 3, __func__);
1549 if (count >= 39)
1550 return -EINVAL;
1551
1552 rc = kstrtouint(buf, 0, &bs1);
1553
1554 if (rc == -EINVAL) {
1555 IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %s\n",
1556 buf);
1557 return -EINVAL;
1558 }
1559 if ((rc == -ERANGE) || (bs1 > NETIUCV_BUFSIZE_MAX)) {
1560 IUCV_DBF_TEXT_(setup, 2,
1561 "buffer_write: buffer size %d too large\n",
1562 bs1);
1563 return -EINVAL;
1564 }
1565 if ((ndev->flags & IFF_RUNNING) &&
1566 (bs1 < (ndev->mtu + NETIUCV_HDRLEN + 2))) {
1567 IUCV_DBF_TEXT_(setup, 2,
1568 "buffer_write: buffer size %d too small\n",
1569 bs1);
1570 return -EINVAL;
1571 }
1572 if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) {
1573 IUCV_DBF_TEXT_(setup, 2,
1574 "buffer_write: buffer size %d too small\n",
1575 bs1);
1576 return -EINVAL;
1577 }
1578
1579 priv->conn->max_buffsize = bs1;
1580 if (!(ndev->flags & IFF_RUNNING))
1581 ndev->mtu = bs1 - NETIUCV_HDRLEN - NETIUCV_HDRLEN;
1582
1583 return count;
1584
1585 }
1586
1587 static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
1588
1589 static ssize_t dev_fsm_show (struct device *dev, struct device_attribute *attr,
1590 char *buf)
1591 {
1592 struct netiucv_priv *priv = dev_get_drvdata(dev);
1593
1594 IUCV_DBF_TEXT(trace, 5, __func__);
1595 return sprintf(buf, "%s\n", fsm_getstate_str(priv->fsm));
1596 }
1597
1598 static DEVICE_ATTR(device_fsm_state, 0444, dev_fsm_show, NULL);
1599
1600 static ssize_t conn_fsm_show (struct device *dev,
1601 struct device_attribute *attr, char *buf)
1602 {
1603 struct netiucv_priv *priv = dev_get_drvdata(dev);
1604
1605 IUCV_DBF_TEXT(trace, 5, __func__);
1606 return sprintf(buf, "%s\n", fsm_getstate_str(priv->conn->fsm));
1607 }
1608
1609 static DEVICE_ATTR(connection_fsm_state, 0444, conn_fsm_show, NULL);
1610
1611 static ssize_t maxmulti_show (struct device *dev,
1612 struct device_attribute *attr, char *buf)
1613 {
1614 struct netiucv_priv *priv = dev_get_drvdata(dev);
1615
1616 IUCV_DBF_TEXT(trace, 5, __func__);
1617 return sprintf(buf, "%ld\n", priv->conn->prof.maxmulti);
1618 }
1619
1620 static ssize_t maxmulti_write (struct device *dev,
1621 struct device_attribute *attr,
1622 const char *buf, size_t count)
1623 {
1624 struct netiucv_priv *priv = dev_get_drvdata(dev);
1625
1626 IUCV_DBF_TEXT(trace, 4, __func__);
1627 priv->conn->prof.maxmulti = 0;
1628 return count;
1629 }
1630
1631 static DEVICE_ATTR(max_tx_buffer_used, 0644, maxmulti_show, maxmulti_write);
1632
1633 static ssize_t maxcq_show (struct device *dev, struct device_attribute *attr,
1634 char *buf)
1635 {
1636 struct netiucv_priv *priv = dev_get_drvdata(dev);
1637
1638 IUCV_DBF_TEXT(trace, 5, __func__);
1639 return sprintf(buf, "%ld\n", priv->conn->prof.maxcqueue);
1640 }
1641
1642 static ssize_t maxcq_write (struct device *dev, struct device_attribute *attr,
1643 const char *buf, size_t count)
1644 {
1645 struct netiucv_priv *priv = dev_get_drvdata(dev);
1646
1647 IUCV_DBF_TEXT(trace, 4, __func__);
1648 priv->conn->prof.maxcqueue = 0;
1649 return count;
1650 }
1651
1652 static DEVICE_ATTR(max_chained_skbs, 0644, maxcq_show, maxcq_write);
1653
1654 static ssize_t sdoio_show (struct device *dev, struct device_attribute *attr,
1655 char *buf)
1656 {
1657 struct netiucv_priv *priv = dev_get_drvdata(dev);
1658
1659 IUCV_DBF_TEXT(trace, 5, __func__);
1660 return sprintf(buf, "%ld\n", priv->conn->prof.doios_single);
1661 }
1662
1663 static ssize_t sdoio_write (struct device *dev, struct device_attribute *attr,
1664 const char *buf, size_t count)
1665 {
1666 struct netiucv_priv *priv = dev_get_drvdata(dev);
1667
1668 IUCV_DBF_TEXT(trace, 4, __func__);
1669 priv->conn->prof.doios_single = 0;
1670 return count;
1671 }
1672
1673 static DEVICE_ATTR(tx_single_write_ops, 0644, sdoio_show, sdoio_write);
1674
1675 static ssize_t mdoio_show (struct device *dev, struct device_attribute *attr,
1676 char *buf)
1677 {
1678 struct netiucv_priv *priv = dev_get_drvdata(dev);
1679
1680 IUCV_DBF_TEXT(trace, 5, __func__);
1681 return sprintf(buf, "%ld\n", priv->conn->prof.doios_multi);
1682 }
1683
1684 static ssize_t mdoio_write (struct device *dev, struct device_attribute *attr,
1685 const char *buf, size_t count)
1686 {
1687 struct netiucv_priv *priv = dev_get_drvdata(dev);
1688
1689 IUCV_DBF_TEXT(trace, 5, __func__);
1690 priv->conn->prof.doios_multi = 0;
1691 return count;
1692 }
1693
1694 static DEVICE_ATTR(tx_multi_write_ops, 0644, mdoio_show, mdoio_write);
1695
1696 static ssize_t txlen_show (struct device *dev, struct device_attribute *attr,
1697 char *buf)
1698 {
1699 struct netiucv_priv *priv = dev_get_drvdata(dev);
1700
1701 IUCV_DBF_TEXT(trace, 5, __func__);
1702 return sprintf(buf, "%ld\n", priv->conn->prof.txlen);
1703 }
1704
1705 static ssize_t txlen_write (struct device *dev, struct device_attribute *attr,
1706 const char *buf, size_t count)
1707 {
1708 struct netiucv_priv *priv = dev_get_drvdata(dev);
1709
1710 IUCV_DBF_TEXT(trace, 4, __func__);
1711 priv->conn->prof.txlen = 0;
1712 return count;
1713 }
1714
1715 static DEVICE_ATTR(netto_bytes, 0644, txlen_show, txlen_write);
1716
1717 static ssize_t txtime_show (struct device *dev, struct device_attribute *attr,
1718 char *buf)
1719 {
1720 struct netiucv_priv *priv = dev_get_drvdata(dev);
1721
1722 IUCV_DBF_TEXT(trace, 5, __func__);
1723 return sprintf(buf, "%ld\n", priv->conn->prof.tx_time);
1724 }
1725
1726 static ssize_t txtime_write (struct device *dev, struct device_attribute *attr,
1727 const char *buf, size_t count)
1728 {
1729 struct netiucv_priv *priv = dev_get_drvdata(dev);
1730
1731 IUCV_DBF_TEXT(trace, 4, __func__);
1732 priv->conn->prof.tx_time = 0;
1733 return count;
1734 }
1735
1736 static DEVICE_ATTR(max_tx_io_time, 0644, txtime_show, txtime_write);
1737
1738 static ssize_t txpend_show (struct device *dev, struct device_attribute *attr,
1739 char *buf)
1740 {
1741 struct netiucv_priv *priv = dev_get_drvdata(dev);
1742
1743 IUCV_DBF_TEXT(trace, 5, __func__);
1744 return sprintf(buf, "%ld\n", priv->conn->prof.tx_pending);
1745 }
1746
1747 static ssize_t txpend_write (struct device *dev, struct device_attribute *attr,
1748 const char *buf, size_t count)
1749 {
1750 struct netiucv_priv *priv = dev_get_drvdata(dev);
1751
1752 IUCV_DBF_TEXT(trace, 4, __func__);
1753 priv->conn->prof.tx_pending = 0;
1754 return count;
1755 }
1756
1757 static DEVICE_ATTR(tx_pending, 0644, txpend_show, txpend_write);
1758
1759 static ssize_t txmpnd_show (struct device *dev, struct device_attribute *attr,
1760 char *buf)
1761 {
1762 struct netiucv_priv *priv = dev_get_drvdata(dev);
1763
1764 IUCV_DBF_TEXT(trace, 5, __func__);
1765 return sprintf(buf, "%ld\n", priv->conn->prof.tx_max_pending);
1766 }
1767
1768 static ssize_t txmpnd_write (struct device *dev, struct device_attribute *attr,
1769 const char *buf, size_t count)
1770 {
1771 struct netiucv_priv *priv = dev_get_drvdata(dev);
1772
1773 IUCV_DBF_TEXT(trace, 4, __func__);
1774 priv->conn->prof.tx_max_pending = 0;
1775 return count;
1776 }
1777
1778 static DEVICE_ATTR(tx_max_pending, 0644, txmpnd_show, txmpnd_write);
1779
1780 static struct attribute *netiucv_attrs[] = {
1781 &dev_attr_buffer.attr,
1782 &dev_attr_user.attr,
1783 NULL,
1784 };
1785
1786 static struct attribute_group netiucv_attr_group = {
1787 .attrs = netiucv_attrs,
1788 };
1789
1790 static struct attribute *netiucv_stat_attrs[] = {
1791 &dev_attr_device_fsm_state.attr,
1792 &dev_attr_connection_fsm_state.attr,
1793 &dev_attr_max_tx_buffer_used.attr,
1794 &dev_attr_max_chained_skbs.attr,
1795 &dev_attr_tx_single_write_ops.attr,
1796 &dev_attr_tx_multi_write_ops.attr,
1797 &dev_attr_netto_bytes.attr,
1798 &dev_attr_max_tx_io_time.attr,
1799 &dev_attr_tx_pending.attr,
1800 &dev_attr_tx_max_pending.attr,
1801 NULL,
1802 };
1803
1804 static struct attribute_group netiucv_stat_attr_group = {
1805 .name = "stats",
1806 .attrs = netiucv_stat_attrs,
1807 };
1808
1809 static const struct attribute_group *netiucv_attr_groups[] = {
1810 &netiucv_stat_attr_group,
1811 &netiucv_attr_group,
1812 NULL,
1813 };
1814
1815 static int netiucv_register_device(struct net_device *ndev)
1816 {
1817 struct netiucv_priv *priv = netdev_priv(ndev);
1818 struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1819 int ret;
1820
1821 IUCV_DBF_TEXT(trace, 3, __func__);
1822
1823 if (dev) {
1824 dev_set_name(dev, "net%s", ndev->name);
1825 dev->bus = &iucv_bus;
1826 dev->parent = iucv_root;
1827 dev->groups = netiucv_attr_groups;
1828 /*
1829 * The release function could be called after the
1830 * module has been unloaded. It's _only_ task is to
1831 * free the struct. Therefore, we specify kfree()
1832 * directly here. (Probably a little bit obfuscating
1833 * but legitime ...).
1834 */
1835 dev->release = (void (*)(struct device *))kfree;
1836 dev->driver = &netiucv_driver;
1837 } else
1838 return -ENOMEM;
1839
1840 ret = device_register(dev);
1841 if (ret) {
1842 put_device(dev);
1843 return ret;
1844 }
1845 priv->dev = dev;
1846 dev_set_drvdata(dev, priv);
1847 return 0;
1848 }
1849
1850 static void netiucv_unregister_device(struct device *dev)
1851 {
1852 IUCV_DBF_TEXT(trace, 3, __func__);
1853 device_unregister(dev);
1854 }
1855
1856 /**
1857 * Allocate and initialize a new connection structure.
1858 * Add it to the list of netiucv connections;
1859 */
1860 static struct iucv_connection *netiucv_new_connection(struct net_device *dev,
1861 char *username,
1862 char *userdata)
1863 {
1864 struct iucv_connection *conn;
1865
1866 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1867 if (!conn)
1868 goto out;
1869 skb_queue_head_init(&conn->collect_queue);
1870 skb_queue_head_init(&conn->commit_queue);
1871 spin_lock_init(&conn->collect_lock);
1872 conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;
1873 conn->netdev = dev;
1874
1875 conn->rx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
1876 if (!conn->rx_buff)
1877 goto out_conn;
1878 conn->tx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
1879 if (!conn->tx_buff)
1880 goto out_rx;
1881 conn->fsm = init_fsm("netiucvconn", conn_state_names,
1882 conn_event_names, NR_CONN_STATES,
1883 NR_CONN_EVENTS, conn_fsm, CONN_FSM_LEN,
1884 GFP_KERNEL);
1885 if (!conn->fsm)
1886 goto out_tx;
1887
1888 fsm_settimer(conn->fsm, &conn->timer);
1889 fsm_newstate(conn->fsm, CONN_STATE_INVALID);
1890
1891 if (userdata)
1892 memcpy(conn->userdata, userdata, 17);
1893 if (username) {
1894 memcpy(conn->userid, username, 9);
1895 fsm_newstate(conn->fsm, CONN_STATE_STOPPED);
1896 }
1897
1898 write_lock_bh(&iucv_connection_rwlock);
1899 list_add_tail(&conn->list, &iucv_connection_list);
1900 write_unlock_bh(&iucv_connection_rwlock);
1901 return conn;
1902
1903 out_tx:
1904 kfree_skb(conn->tx_buff);
1905 out_rx:
1906 kfree_skb(conn->rx_buff);
1907 out_conn:
1908 kfree(conn);
1909 out:
1910 return NULL;
1911 }
1912
1913 /**
1914 * Release a connection structure and remove it from the
1915 * list of netiucv connections.
1916 */
1917 static void netiucv_remove_connection(struct iucv_connection *conn)
1918 {
1919
1920 IUCV_DBF_TEXT(trace, 3, __func__);
1921 write_lock_bh(&iucv_connection_rwlock);
1922 list_del_init(&conn->list);
1923 write_unlock_bh(&iucv_connection_rwlock);
1924 fsm_deltimer(&conn->timer);
1925 netiucv_purge_skb_queue(&conn->collect_queue);
1926 if (conn->path) {
1927 iucv_path_sever(conn->path, conn->userdata);
1928 kfree(conn->path);
1929 conn->path = NULL;
1930 }
1931 netiucv_purge_skb_queue(&conn->commit_queue);
1932 kfree_fsm(conn->fsm);
1933 kfree_skb(conn->rx_buff);
1934 kfree_skb(conn->tx_buff);
1935 }
1936
1937 /**
1938 * Release everything of a net device.
1939 */
1940 static void netiucv_free_netdevice(struct net_device *dev)
1941 {
1942 struct netiucv_priv *privptr = netdev_priv(dev);
1943
1944 IUCV_DBF_TEXT(trace, 3, __func__);
1945
1946 if (!dev)
1947 return;
1948
1949 if (privptr) {
1950 if (privptr->conn)
1951 netiucv_remove_connection(privptr->conn);
1952 if (privptr->fsm)
1953 kfree_fsm(privptr->fsm);
1954 privptr->conn = NULL; privptr->fsm = NULL;
1955 /* privptr gets freed by free_netdev() */
1956 }
1957 free_netdev(dev);
1958 }
1959
1960 /**
1961 * Initialize a net device. (Called from kernel in alloc_netdev())
1962 */
1963 static const struct net_device_ops netiucv_netdev_ops = {
1964 .ndo_open = netiucv_open,
1965 .ndo_stop = netiucv_close,
1966 .ndo_get_stats = netiucv_stats,
1967 .ndo_start_xmit = netiucv_tx,
1968 };
1969
1970 static void netiucv_setup_netdevice(struct net_device *dev)
1971 {
1972 dev->mtu = NETIUCV_MTU_DEFAULT;
1973 dev->min_mtu = 576;
1974 dev->max_mtu = NETIUCV_MTU_MAX;
1975 dev->destructor = netiucv_free_netdevice;
1976 dev->hard_header_len = NETIUCV_HDRLEN;
1977 dev->addr_len = 0;
1978 dev->type = ARPHRD_SLIP;
1979 dev->tx_queue_len = NETIUCV_QUEUELEN_DEFAULT;
1980 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1981 dev->netdev_ops = &netiucv_netdev_ops;
1982 }
1983
1984 /**
1985 * Allocate and initialize everything of a net device.
1986 */
1987 static struct net_device *netiucv_init_netdevice(char *username, char *userdata)
1988 {
1989 struct netiucv_priv *privptr;
1990 struct net_device *dev;
1991
1992 dev = alloc_netdev(sizeof(struct netiucv_priv), "iucv%d",
1993 NET_NAME_UNKNOWN, netiucv_setup_netdevice);
1994 if (!dev)
1995 return NULL;
1996 rtnl_lock();
1997 if (dev_alloc_name(dev, dev->name) < 0)
1998 goto out_netdev;
1999
2000 privptr = netdev_priv(dev);
2001 privptr->fsm = init_fsm("netiucvdev", dev_state_names,
2002 dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS,
2003 dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
2004 if (!privptr->fsm)
2005 goto out_netdev;
2006
2007 privptr->conn = netiucv_new_connection(dev, username, userdata);
2008 if (!privptr->conn) {
2009 IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n");
2010 goto out_fsm;
2011 }
2012 fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
2013 return dev;
2014
2015 out_fsm:
2016 kfree_fsm(privptr->fsm);
2017 out_netdev:
2018 rtnl_unlock();
2019 free_netdev(dev);
2020 return NULL;
2021 }
2022
2023 static ssize_t conn_write(struct device_driver *drv,
2024 const char *buf, size_t count)
2025 {
2026 char username[9];
2027 char userdata[17];
2028 int rc;
2029 struct net_device *dev;
2030 struct netiucv_priv *priv;
2031 struct iucv_connection *cp;
2032
2033 IUCV_DBF_TEXT(trace, 3, __func__);
2034 rc = netiucv_check_user(buf, count, username, userdata);
2035 if (rc)
2036 return rc;
2037
2038 read_lock_bh(&iucv_connection_rwlock);
2039 list_for_each_entry(cp, &iucv_connection_list, list) {
2040 if (!strncmp(username, cp->userid, 9) &&
2041 !strncmp(userdata, cp->userdata, 17)) {
2042 read_unlock_bh(&iucv_connection_rwlock);
2043 IUCV_DBF_TEXT_(setup, 2, "conn_write: Connection to %s "
2044 "already exists\n", netiucv_printuser(cp));
2045 return -EEXIST;
2046 }
2047 }
2048 read_unlock_bh(&iucv_connection_rwlock);
2049
2050 dev = netiucv_init_netdevice(username, userdata);
2051 if (!dev) {
2052 IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n");
2053 return -ENODEV;
2054 }
2055
2056 rc = netiucv_register_device(dev);
2057 if (rc) {
2058 rtnl_unlock();
2059 IUCV_DBF_TEXT_(setup, 2,
2060 "ret %d from netiucv_register_device\n", rc);
2061 goto out_free_ndev;
2062 }
2063
2064 /* sysfs magic */
2065 priv = netdev_priv(dev);
2066 SET_NETDEV_DEV(dev, priv->dev);
2067
2068 rc = register_netdevice(dev);
2069 rtnl_unlock();
2070 if (rc)
2071 goto out_unreg;
2072
2073 dev_info(priv->dev, "The IUCV interface to %s has been established "
2074 "successfully\n",
2075 netiucv_printuser(priv->conn));
2076
2077 return count;
2078
2079 out_unreg:
2080 netiucv_unregister_device(priv->dev);
2081 out_free_ndev:
2082 netiucv_free_netdevice(dev);
2083 return rc;
2084 }
2085
2086 static DRIVER_ATTR(connection, 0200, NULL, conn_write);
2087
2088 static ssize_t remove_write (struct device_driver *drv,
2089 const char *buf, size_t count)
2090 {
2091 struct iucv_connection *cp;
2092 struct net_device *ndev;
2093 struct netiucv_priv *priv;
2094 struct device *dev;
2095 char name[IFNAMSIZ];
2096 const char *p;
2097 int i;
2098
2099 IUCV_DBF_TEXT(trace, 3, __func__);
2100
2101 if (count >= IFNAMSIZ)
2102 count = IFNAMSIZ - 1;
2103
2104 for (i = 0, p = buf; i < count && *p; i++, p++) {
2105 if (*p == '\n' || *p == ' ')
2106 /* trailing lf, grr */
2107 break;
2108 name[i] = *p;
2109 }
2110 name[i] = '\0';
2111
2112 read_lock_bh(&iucv_connection_rwlock);
2113 list_for_each_entry(cp, &iucv_connection_list, list) {
2114 ndev = cp->netdev;
2115 priv = netdev_priv(ndev);
2116 dev = priv->dev;
2117 if (strncmp(name, ndev->name, count))
2118 continue;
2119 read_unlock_bh(&iucv_connection_rwlock);
2120 if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
2121 dev_warn(dev, "The IUCV device is connected"
2122 " to %s and cannot be removed\n",
2123 priv->conn->userid);
2124 IUCV_DBF_TEXT(data, 2, "remove_write: still active\n");
2125 return -EPERM;
2126 }
2127 unregister_netdev(ndev);
2128 netiucv_unregister_device(dev);
2129 return count;
2130 }
2131 read_unlock_bh(&iucv_connection_rwlock);
2132 IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");
2133 return -EINVAL;
2134 }
2135
2136 static DRIVER_ATTR(remove, 0200, NULL, remove_write);
2137
2138 static struct attribute * netiucv_drv_attrs[] = {
2139 &driver_attr_connection.attr,
2140 &driver_attr_remove.attr,
2141 NULL,
2142 };
2143
2144 static struct attribute_group netiucv_drv_attr_group = {
2145 .attrs = netiucv_drv_attrs,
2146 };
2147
2148 static const struct attribute_group *netiucv_drv_attr_groups[] = {
2149 &netiucv_drv_attr_group,
2150 NULL,
2151 };
2152
2153 static void netiucv_banner(void)
2154 {
2155 pr_info("driver initialized\n");
2156 }
2157
2158 static void __exit netiucv_exit(void)
2159 {
2160 struct iucv_connection *cp;
2161 struct net_device *ndev;
2162 struct netiucv_priv *priv;
2163 struct device *dev;
2164
2165 IUCV_DBF_TEXT(trace, 3, __func__);
2166 while (!list_empty(&iucv_connection_list)) {
2167 cp = list_entry(iucv_connection_list.next,
2168 struct iucv_connection, list);
2169 ndev = cp->netdev;
2170 priv = netdev_priv(ndev);
2171 dev = priv->dev;
2172
2173 unregister_netdev(ndev);
2174 netiucv_unregister_device(dev);
2175 }
2176
2177 device_unregister(netiucv_dev);
2178 driver_unregister(&netiucv_driver);
2179 iucv_unregister(&netiucv_handler, 1);
2180 iucv_unregister_dbf_views();
2181
2182 pr_info("driver unloaded\n");
2183 return;
2184 }
2185
2186 static int __init netiucv_init(void)
2187 {
2188 int rc;
2189
2190 rc = iucv_register_dbf_views();
2191 if (rc)
2192 goto out;
2193 rc = iucv_register(&netiucv_handler, 1);
2194 if (rc)
2195 goto out_dbf;
2196 IUCV_DBF_TEXT(trace, 3, __func__);
2197 netiucv_driver.groups = netiucv_drv_attr_groups;
2198 rc = driver_register(&netiucv_driver);
2199 if (rc) {
2200 IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc);
2201 goto out_iucv;
2202 }
2203 /* establish dummy device */
2204 netiucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2205 if (!netiucv_dev) {
2206 rc = -ENOMEM;
2207 goto out_driver;
2208 }
2209 dev_set_name(netiucv_dev, "netiucv");
2210 netiucv_dev->bus = &iucv_bus;
2211 netiucv_dev->parent = iucv_root;
2212 netiucv_dev->release = (void (*)(struct device *))kfree;
2213 netiucv_dev->driver = &netiucv_driver;
2214 rc = device_register(netiucv_dev);
2215 if (rc) {
2216 put_device(netiucv_dev);
2217 goto out_driver;
2218 }
2219 netiucv_banner();
2220 return rc;
2221
2222 out_driver:
2223 driver_unregister(&netiucv_driver);
2224 out_iucv:
2225 iucv_unregister(&netiucv_handler, 1);
2226 out_dbf:
2227 iucv_unregister_dbf_views();
2228 out:
2229 return rc;
2230 }
2231
2232 module_init(netiucv_init);
2233 module_exit(netiucv_exit);
2234 MODULE_LICENSE("GPL");
Linux with added FPC-III support