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lockdep: Reintroduce generation count to make BFS faster
[linux-2.6.git] / drivers / s390 / net / ctcm_mpc.c
blob781e18be7e8fb1cb26dcabc09df6750edac6bd2f
1 /*
2 * drivers/s390/net/ctcm_mpc.c
3 *
4 * Copyright IBM Corp. 2004, 2007
5 * Authors: Belinda Thompson (belindat@us.ibm.com)
6 * Andy Richter (richtera@us.ibm.com)
7 * Peter Tiedemann (ptiedem@de.ibm.com)
8 */
9
10 /*
11 This module exports functions to be used by CCS:
12 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
13 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
14 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
15 EXPORT_SYMBOL(ctc_mpc_flow_control);
16 */
17
18 #undef DEBUG
19 #undef DEBUGDATA
20 #undef DEBUGCCW
21
22 #define KMSG_COMPONENT "ctcm"
23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
24
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/interrupt.h>
32 #include <linux/timer.h>
33 #include <linux/sched.h>
34
35 #include <linux/signal.h>
36 #include <linux/string.h>
37 #include <linux/proc_fs.h>
38
39 #include <linux/ip.h>
40 #include <linux/if_arp.h>
41 #include <linux/tcp.h>
42 #include <linux/skbuff.h>
43 #include <linux/ctype.h>
44 #include <linux/netdevice.h>
45 #include <net/dst.h>
46
47 #include <linux/io.h> /* instead of <asm/io.h> ok ? */
48 #include <asm/ccwdev.h>
49 #include <asm/ccwgroup.h>
50 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */
51 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */
52 #include <linux/wait.h>
53 #include <linux/moduleparam.h>
54 #include <asm/idals.h>
55
56 #include "cu3088.h"
57 #include "ctcm_mpc.h"
58 #include "ctcm_main.h"
59 #include "ctcm_fsms.h"
60
61 static const struct xid2 init_xid = {
62 .xid2_type_id = XID_FM2,
63 .xid2_len = 0x45,
64 .xid2_adj_id = 0,
65 .xid2_rlen = 0x31,
66 .xid2_resv1 = 0,
67 .xid2_flag1 = 0,
68 .xid2_fmtt = 0,
69 .xid2_flag4 = 0x80,
70 .xid2_resv2 = 0,
71 .xid2_tgnum = 0,
72 .xid2_sender_id = 0,
73 .xid2_flag2 = 0,
74 .xid2_option = XID2_0,
75 .xid2_resv3 = "\x00",
76 .xid2_resv4 = 0,
77 .xid2_dlc_type = XID2_READ_SIDE,
78 .xid2_resv5 = 0,
79 .xid2_mpc_flag = 0,
80 .xid2_resv6 = 0,
81 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
82 };
83
84 static const struct th_header thnorm = {
85 .th_seg = 0x00,
86 .th_ch_flag = TH_IS_XID,
87 .th_blk_flag = TH_DATA_IS_XID,
88 .th_is_xid = 0x01,
89 .th_seq_num = 0x00000000,
90 };
91
92 static const struct th_header thdummy = {
93 .th_seg = 0x00,
94 .th_ch_flag = 0x00,
95 .th_blk_flag = TH_DATA_IS_XID,
96 .th_is_xid = 0x01,
97 .th_seq_num = 0x00000000,
98 };
99
100 /*
101 * Definition of one MPC group
102 */
103
104 /*
105 * Compatibility macros for busy handling
106 * of network devices.
107 */
108
109 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
110
111 /*
112 * MPC Group state machine actions (static prototypes)
113 */
114 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
115 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
116 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
117 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
118 static int mpc_validate_xid(struct mpcg_info *mpcginfo);
119 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
120 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
121 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
122 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
123 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
124 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
125
126 #ifdef DEBUGDATA
127 /*-------------------------------------------------------------------*
128 * Dump buffer format *
129 * *
130 *--------------------------------------------------------------------*/
131 void ctcmpc_dumpit(char *buf, int len)
132 {
133 __u32 ct, sw, rm, dup;
134 char *ptr, *rptr;
135 char tbuf[82], tdup[82];
136 #if (UTS_MACHINE == s390x)
137 char addr[22];
138 #else
139 char addr[12];
140 #endif
141 char boff[12];
142 char bhex[82], duphex[82];
143 char basc[40];
144
145 sw = 0;
146 rptr = ptr = buf;
147 rm = 16;
148 duphex[0] = 0x00;
149 dup = 0;
150
151 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
152 if (sw == 0) {
153 #if (UTS_MACHINE == s390x)
154 sprintf(addr, "%16.16lx", (__u64)rptr);
155 #else
156 sprintf(addr, "%8.8X", (__u32)rptr);
157 #endif
158
159 sprintf(boff, "%4.4X", (__u32)ct);
160 bhex[0] = '\0';
161 basc[0] = '\0';
162 }
163 if ((sw == 4) || (sw == 12))
164 strcat(bhex, " ");
165 if (sw == 8)
166 strcat(bhex, " ");
167
168 #if (UTS_MACHINE == s390x)
169 sprintf(tbuf, "%2.2lX", (__u64)*ptr);
170 #else
171 sprintf(tbuf, "%2.2X", (__u32)*ptr);
172 #endif
173
174 tbuf[2] = '\0';
175 strcat(bhex, tbuf);
176 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
177 basc[sw] = *ptr;
178 else
179 basc[sw] = '.';
180
181 basc[sw+1] = '\0';
182 sw++;
183 rm--;
184 if (sw != 16)
185 continue;
186 if ((strcmp(duphex, bhex)) != 0) {
187 if (dup != 0) {
188 sprintf(tdup,
189 "Duplicate as above to %s", addr);
190 ctcm_pr_debug(" --- %s ---\n",
191 tdup);
192 }
193 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
194 addr, boff, bhex, basc);
195 dup = 0;
196 strcpy(duphex, bhex);
197 } else
198 dup++;
199
200 sw = 0;
201 rm = 16;
202 } /* endfor */
203
204 if (sw != 0) {
205 for ( ; rm > 0; rm--, sw++) {
206 if ((sw == 4) || (sw == 12))
207 strcat(bhex, " ");
208 if (sw == 8)
209 strcat(bhex, " ");
210 strcat(bhex, " ");
211 strcat(basc, " ");
212 }
213 if (dup != 0) {
214 sprintf(tdup, "Duplicate as above to %s", addr);
215 ctcm_pr_debug(" --- %s ---\n", tdup);
216 }
217 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
218 addr, boff, bhex, basc);
219 } else {
220 if (dup >= 1) {
221 sprintf(tdup, "Duplicate as above to %s", addr);
222 ctcm_pr_debug(" --- %s ---\n", tdup);
223 }
224 if (dup != 0) {
225 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
226 addr, boff, bhex, basc);
227 }
228 }
229
230 return;
231
232 } /* end of ctcmpc_dumpit */
233 #endif
234
235 #ifdef DEBUGDATA
236 /*
237 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
238 *
239 * skb The sk_buff to dump.
240 * offset Offset relative to skb-data, where to start the dump.
241 */
242 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
243 {
244 __u8 *p = skb->data;
245 struct th_header *header;
246 struct pdu *pheader;
247 int bl = skb->len;
248 int i;
249
250 if (p == NULL)
251 return;
252
253 p += offset;
254 header = (struct th_header *)p;
255
256 ctcm_pr_debug("dump:\n");
257 ctcm_pr_debug("skb len=%d \n", skb->len);
258 if (skb->len > 2) {
259 switch (header->th_ch_flag) {
260 case TH_HAS_PDU:
261 break;
262 case 0x00:
263 case TH_IS_XID:
264 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
265 (header->th_is_xid == 0x01))
266 goto dumpth;
267 case TH_SWEEP_REQ:
268 goto dumpth;
269 case TH_SWEEP_RESP:
270 goto dumpth;
271 default:
272 break;
273 }
274
275 pheader = (struct pdu *)p;
276 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
277 pheader->pdu_offset, pheader->pdu_offset);
278 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
279 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
280 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
281 goto dumpdata;
282
283 dumpth:
284 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
285 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
286 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
287 ctcm_pr_debug("th->type : %s\n",
288 (header->th_is_xid) ? "DATA" : "XID");
289 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
290
291 }
292 dumpdata:
293 if (bl > 32)
294 bl = 32;
295 ctcm_pr_debug("data: ");
296 for (i = 0; i < bl; i++)
297 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
298 ctcm_pr_debug("\n");
299 }
300 #endif
301
302 static struct net_device *ctcmpc_get_dev(int port_num)
303 {
304 char device[20];
305 struct net_device *dev;
306 struct ctcm_priv *priv;
307
308 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
309
310 dev = __dev_get_by_name(&init_net, device);
311
312 if (dev == NULL) {
313 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
314 "%s: Device not found by name: %s",
315 CTCM_FUNTAIL, device);
316 return NULL;
317 }
318 priv = dev->ml_priv;
319 if (priv == NULL) {
320 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
321 "%s(%s): dev->ml_priv is NULL",
322 CTCM_FUNTAIL, device);
323 return NULL;
324 }
325 if (priv->mpcg == NULL) {
326 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
327 "%s(%s): priv->mpcg is NULL",
328 CTCM_FUNTAIL, device);
329 return NULL;
330 }
331 return dev;
332 }
333
334 /*
335 * ctc_mpc_alloc_channel
336 * (exported interface)
337 *
338 * Device Initialization :
339 * ACTPATH driven IO operations
340 */
341 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
342 {
343 struct net_device *dev;
344 struct mpc_group *grp;
345 struct ctcm_priv *priv;
346
347 dev = ctcmpc_get_dev(port_num);
348 if (dev == NULL)
349 return 1;
350 priv = dev->ml_priv;
351 grp = priv->mpcg;
352
353 grp->allochanfunc = callback;
354 grp->port_num = port_num;
355 grp->port_persist = 1;
356
357 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
358 "%s(%s): state=%s",
359 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
360
361 switch (fsm_getstate(grp->fsm)) {
362 case MPCG_STATE_INOP:
363 /* Group is in the process of terminating */
364 grp->alloc_called = 1;
365 break;
366 case MPCG_STATE_RESET:
367 /* MPC Group will transition to state */
368 /* MPCG_STATE_XID2INITW iff the minimum number */
369 /* of 1 read and 1 write channel have successfully*/
370 /* activated */
371 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
372 if (callback)
373 grp->send_qllc_disc = 1;
374 case MPCG_STATE_XID0IOWAIT:
375 fsm_deltimer(&grp->timer);
376 grp->outstanding_xid2 = 0;
377 grp->outstanding_xid7 = 0;
378 grp->outstanding_xid7_p2 = 0;
379 grp->saved_xid2 = NULL;
380 if (callback)
381 ctcm_open(dev);
382 fsm_event(priv->fsm, DEV_EVENT_START, dev);
383 break;
384 case MPCG_STATE_READY:
385 /* XID exchanges completed after PORT was activated */
386 /* Link station already active */
387 /* Maybe timing issue...retry callback */
388 grp->allocchan_callback_retries++;
389 if (grp->allocchan_callback_retries < 4) {
390 if (grp->allochanfunc)
391 grp->allochanfunc(grp->port_num,
392 grp->group_max_buflen);
393 } else {
394 /* there are problems...bail out */
395 /* there may be a state mismatch so restart */
396 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
397 grp->allocchan_callback_retries = 0;
398 }
399 break;
400 }
401
402 return 0;
403 }
404 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
405
406 /*
407 * ctc_mpc_establish_connectivity
408 * (exported interface)
409 */
410 void ctc_mpc_establish_connectivity(int port_num,
411 void (*callback)(int, int, int))
412 {
413 struct net_device *dev;
414 struct mpc_group *grp;
415 struct ctcm_priv *priv;
416 struct channel *rch, *wch;
417
418 dev = ctcmpc_get_dev(port_num);
419 if (dev == NULL)
420 return;
421 priv = dev->ml_priv;
422 grp = priv->mpcg;
423 rch = priv->channel[READ];
424 wch = priv->channel[WRITE];
425
426 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
427 "%s(%s): state=%s",
428 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
429
430 grp->estconnfunc = callback;
431 grp->port_num = port_num;
432
433 switch (fsm_getstate(grp->fsm)) {
434 case MPCG_STATE_READY:
435 /* XID exchanges completed after PORT was activated */
436 /* Link station already active */
437 /* Maybe timing issue...retry callback */
438 fsm_deltimer(&grp->timer);
439 grp->estconn_callback_retries++;
440 if (grp->estconn_callback_retries < 4) {
441 if (grp->estconnfunc) {
442 grp->estconnfunc(grp->port_num, 0,
443 grp->group_max_buflen);
444 grp->estconnfunc = NULL;
445 }
446 } else {
447 /* there are problems...bail out */
448 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
449 grp->estconn_callback_retries = 0;
450 }
451 break;
452 case MPCG_STATE_INOP:
453 case MPCG_STATE_RESET:
454 /* MPC Group is not ready to start XID - min num of */
455 /* 1 read and 1 write channel have not been acquired*/
456
457 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
458 "%s(%s): REJECTED - inactive channels",
459 CTCM_FUNTAIL, dev->name);
460 if (grp->estconnfunc) {
461 grp->estconnfunc(grp->port_num, -1, 0);
462 grp->estconnfunc = NULL;
463 }
464 break;
465 case MPCG_STATE_XID2INITW:
466 /* alloc channel was called but no XID exchange */
467 /* has occurred. initiate xside XID exchange */
468 /* make sure yside XID0 processing has not started */
469
470 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
471 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
472 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
473 "%s(%s): ABORT - PASSIVE XID",
474 CTCM_FUNTAIL, dev->name);
475 break;
476 }
477 grp->send_qllc_disc = 1;
478 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
479 fsm_deltimer(&grp->timer);
480 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
481 MPCG_EVENT_TIMER, dev);
482 grp->outstanding_xid7 = 0;
483 grp->outstanding_xid7_p2 = 0;
484 grp->saved_xid2 = NULL;
485 if ((rch->in_mpcgroup) &&
486 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
487 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
488 else {
489 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
490 "%s(%s): RX-%s not ready for ACTIVE XID0",
491 CTCM_FUNTAIL, dev->name, rch->id);
492 if (grp->estconnfunc) {
493 grp->estconnfunc(grp->port_num, -1, 0);
494 grp->estconnfunc = NULL;
495 }
496 fsm_deltimer(&grp->timer);
497 goto done;
498 }
499 if ((wch->in_mpcgroup) &&
500 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
501 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
502 else {
503 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
504 "%s(%s): WX-%s not ready for ACTIVE XID0",
505 CTCM_FUNTAIL, dev->name, wch->id);
506 if (grp->estconnfunc) {
507 grp->estconnfunc(grp->port_num, -1, 0);
508 grp->estconnfunc = NULL;
509 }
510 fsm_deltimer(&grp->timer);
511 goto done;
512 }
513 break;
514 case MPCG_STATE_XID0IOWAIT:
515 /* already in active XID negotiations */
516 default:
517 break;
518 }
519
520 done:
521 CTCM_PR_DEBUG("Exit %s()\n", __func__);
522 return;
523 }
524 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
525
526 /*
527 * ctc_mpc_dealloc_ch
528 * (exported interface)
529 */
530 void ctc_mpc_dealloc_ch(int port_num)
531 {
532 struct net_device *dev;
533 struct ctcm_priv *priv;
534 struct mpc_group *grp;
535
536 dev = ctcmpc_get_dev(port_num);
537 if (dev == NULL)
538 return;
539 priv = dev->ml_priv;
540 grp = priv->mpcg;
541
542 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
543 "%s: %s: refcount = %d\n",
544 CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt));
545
546 fsm_deltimer(&priv->restart_timer);
547 grp->channels_terminating = 0;
548 fsm_deltimer(&grp->timer);
549 grp->allochanfunc = NULL;
550 grp->estconnfunc = NULL;
551 grp->port_persist = 0;
552 grp->send_qllc_disc = 0;
553 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
554
555 ctcm_close(dev);
556 return;
557 }
558 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
559
560 /*
561 * ctc_mpc_flow_control
562 * (exported interface)
563 */
564 void ctc_mpc_flow_control(int port_num, int flowc)
565 {
566 struct ctcm_priv *priv;
567 struct mpc_group *grp;
568 struct net_device *dev;
569 struct channel *rch;
570 int mpcg_state;
571
572 dev = ctcmpc_get_dev(port_num);
573 if (dev == NULL)
574 return;
575 priv = dev->ml_priv;
576 grp = priv->mpcg;
577
578 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
579 "%s: %s: flowc = %d",
580 CTCM_FUNTAIL, dev->name, flowc);
581
582 rch = priv->channel[READ];
583
584 mpcg_state = fsm_getstate(grp->fsm);
585 switch (flowc) {
586 case 1:
587 if (mpcg_state == MPCG_STATE_FLOWC)
588 break;
589 if (mpcg_state == MPCG_STATE_READY) {
590 if (grp->flow_off_called == 1)
591 grp->flow_off_called = 0;
592 else
593 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
594 break;
595 }
596 break;
597 case 0:
598 if (mpcg_state == MPCG_STATE_FLOWC) {
599 fsm_newstate(grp->fsm, MPCG_STATE_READY);
600 /* ensure any data that has accumulated */
601 /* on the io_queue will now be sen t */
602 tasklet_schedule(&rch->ch_tasklet);
603 }
604 /* possible race condition */
605 if (mpcg_state == MPCG_STATE_READY) {
606 grp->flow_off_called = 1;
607 break;
608 }
609 break;
610 }
611
612 }
613 EXPORT_SYMBOL(ctc_mpc_flow_control);
614
615 static int mpc_send_qllc_discontact(struct net_device *);
616
617 /*
618 * helper function of ctcmpc_unpack_skb
619 */
620 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
621 {
622 struct channel *rch = mpcginfo->ch;
623 struct net_device *dev = rch->netdev;
624 struct ctcm_priv *priv = dev->ml_priv;
625 struct mpc_group *grp = priv->mpcg;
626 struct channel *ch = priv->channel[WRITE];
627
628 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
629 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
630
631 grp->sweep_rsp_pend_num--;
632
633 if ((grp->sweep_req_pend_num == 0) &&
634 (grp->sweep_rsp_pend_num == 0)) {
635 fsm_deltimer(&ch->sweep_timer);
636 grp->in_sweep = 0;
637 rch->th_seq_num = 0x00;
638 ch->th_seq_num = 0x00;
639 ctcm_clear_busy_do(dev);
640 }
641
642 kfree(mpcginfo);
643
644 return;
645
646 }
647
648 /*
649 * helper function of mpc_rcvd_sweep_req
650 * which is a helper of ctcmpc_unpack_skb
651 */
652 static void ctcmpc_send_sweep_resp(struct channel *rch)
653 {
654 struct net_device *dev = rch->netdev;
655 struct ctcm_priv *priv = dev->ml_priv;
656 struct mpc_group *grp = priv->mpcg;
657 int rc = 0;
658 struct th_sweep *header;
659 struct sk_buff *sweep_skb;
660 struct channel *ch = priv->channel[WRITE];
661
662 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
663
664 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
665 if (sweep_skb == NULL) {
666 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
667 "%s(%s): sweep_skb allocation ERROR\n",
668 CTCM_FUNTAIL, rch->id);
669 rc = -ENOMEM;
670 goto done;
671 }
672
673 header = (struct th_sweep *)
674 kmalloc(sizeof(struct th_sweep), gfp_type());
675
676 if (!header) {
677 dev_kfree_skb_any(sweep_skb);
678 rc = -ENOMEM;
679 goto done;
680 }
681
682 header->th.th_seg = 0x00 ;
683 header->th.th_ch_flag = TH_SWEEP_RESP;
684 header->th.th_blk_flag = 0x00;
685 header->th.th_is_xid = 0x00;
686 header->th.th_seq_num = 0x00;
687 header->sw.th_last_seq = ch->th_seq_num;
688
689 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
690
691 kfree(header);
692
693 dev->trans_start = jiffies;
694 skb_queue_tail(&ch->sweep_queue, sweep_skb);
695
696 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
697
698 return;
699
700 done:
701 grp->in_sweep = 0;
702 ctcm_clear_busy_do(dev);
703 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
704
705 return;
706 }
707
708 /*
709 * helper function of ctcmpc_unpack_skb
710 */
711 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
712 {
713 struct channel *rch = mpcginfo->ch;
714 struct net_device *dev = rch->netdev;
715 struct ctcm_priv *priv = dev->ml_priv;
716 struct mpc_group *grp = priv->mpcg;
717 struct channel *ch = priv->channel[WRITE];
718
719 if (do_debug)
720 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
721 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
722
723 if (grp->in_sweep == 0) {
724 grp->in_sweep = 1;
725 ctcm_test_and_set_busy(dev);
726 grp->sweep_req_pend_num = grp->active_channels[READ];
727 grp->sweep_rsp_pend_num = grp->active_channels[READ];
728 }
729
730 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
731
732 grp->sweep_req_pend_num--;
733 ctcmpc_send_sweep_resp(ch);
734 kfree(mpcginfo);
735 return;
736 }
737
738 /*
739 * MPC Group Station FSM definitions
740 */
741 static const char *mpcg_event_names[] = {
742 [MPCG_EVENT_INOP] = "INOP Condition",
743 [MPCG_EVENT_DISCONC] = "Discontact Received",
744 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
745 [MPCG_EVENT_XID2] = "XID2 Received",
746 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
747 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
748 [MPCG_EVENT_TIMER] = "XID Setup Timer",
749 [MPCG_EVENT_DOIO] = "XID DoIO",
750 };
751
752 static const char *mpcg_state_names[] = {
753 [MPCG_STATE_RESET] = "Reset",
754 [MPCG_STATE_INOP] = "INOP",
755 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
756 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
757 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
758 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
759 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
760 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
761 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
762 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
763 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
764 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
765 [MPCG_STATE_READY] = "READY",
766 };
767
768 /*
769 * The MPC Group Station FSM
770 * 22 events
771 */
772 static const fsm_node mpcg_fsm[] = {
773 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
774 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
775 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
776
777 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
778 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
779
780 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
781 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
782 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
783 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
784 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
785
786 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
787 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
788 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
789 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
790 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
791
792 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
793 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
794 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
795 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
796 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
797 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
798 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
799
800 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
801 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
802 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
803 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
804 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
805 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
806
807 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
808 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
809 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
810 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
811 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
812 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
813
814 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
815 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
816 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
817 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
818 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
819 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
820
821 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
822 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
823 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
824 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
825 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
826 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
827 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
828
829 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
830 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
831 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
832 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
833 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
834 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
835
836 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
837 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
838 };
839
840 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
841
842 /*
843 * MPC Group Station FSM action
844 * CTCM_PROTO_MPC only
845 */
846 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
847 {
848 struct net_device *dev = arg;
849 struct ctcm_priv *priv = dev->ml_priv;
850 struct mpc_group *grp = priv->mpcg;
851
852 if (grp == NULL) {
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
854 "%s(%s): No MPC group",
855 CTCM_FUNTAIL, dev->name);
856 return;
857 }
858
859 fsm_deltimer(&grp->timer);
860
861 if (grp->saved_xid2->xid2_flag2 == 0x40) {
862 priv->xid->xid2_flag2 = 0x00;
863 if (grp->estconnfunc) {
864 grp->estconnfunc(grp->port_num, 1,
865 grp->group_max_buflen);
866 grp->estconnfunc = NULL;
867 } else if (grp->allochanfunc)
868 grp->send_qllc_disc = 1;
869
870 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
871 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
872 "%s(%s): fails",
873 CTCM_FUNTAIL, dev->name);
874 return;
875 }
876
877 grp->port_persist = 1;
878 grp->out_of_sequence = 0;
879 grp->estconn_called = 0;
880
881 tasklet_hi_schedule(&grp->mpc_tasklet2);
882
883 return;
884 }
885
886 /*
887 * helper of ctcm_init_netdevice
888 * CTCM_PROTO_MPC only
889 */
890 void mpc_group_ready(unsigned long adev)
891 {
892 struct net_device *dev = (struct net_device *)adev;
893 struct ctcm_priv *priv = dev->ml_priv;
894 struct mpc_group *grp = priv->mpcg;
895 struct channel *ch = NULL;
896
897 if (grp == NULL) {
898 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
899 "%s(%s): No MPC group",
900 CTCM_FUNTAIL, dev->name);
901 return;
902 }
903
904 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
905 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
906 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
907
908 fsm_newstate(grp->fsm, MPCG_STATE_READY);
909
910 /* Put up a read on the channel */
911 ch = priv->channel[READ];
912 ch->pdu_seq = 0;
913 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
914 __func__, ch->pdu_seq);
915
916 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
917 /* Put the write channel in idle state */
918 ch = priv->channel[WRITE];
919 if (ch->collect_len > 0) {
920 spin_lock(&ch->collect_lock);
921 ctcm_purge_skb_queue(&ch->collect_queue);
922 ch->collect_len = 0;
923 spin_unlock(&ch->collect_lock);
924 }
925 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
926 ctcm_clear_busy(dev);
927
928 if (grp->estconnfunc) {
929 grp->estconnfunc(grp->port_num, 0,
930 grp->group_max_buflen);
931 grp->estconnfunc = NULL;
932 } else if (grp->allochanfunc)
933 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
934
935 grp->send_qllc_disc = 1;
936 grp->changed_side = 0;
937
938 return;
939
940 }
941
942 /*
943 * Increment the MPC Group Active Channel Counts
944 * helper of dev_action (called from channel fsm)
945 */
946 void mpc_channel_action(struct channel *ch, int direction, int action)
947 {
948 struct net_device *dev = ch->netdev;
949 struct ctcm_priv *priv = dev->ml_priv;
950 struct mpc_group *grp = priv->mpcg;
951
952 if (grp == NULL) {
953 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
954 "%s(%s): No MPC group",
955 CTCM_FUNTAIL, dev->name);
956 return;
957 }
958
959 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
960
961 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
962 "%s: %i / Grp:%s total_channels=%i, active_channels: "
963 "read=%i, write=%i\n", __func__, action,
964 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
965 grp->active_channels[READ], grp->active_channels[WRITE]);
966
967 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
968 grp->num_channel_paths++;
969 grp->active_channels[direction]++;
970 grp->outstanding_xid2++;
971 ch->in_mpcgroup = 1;
972
973 if (ch->xid_skb != NULL)
974 dev_kfree_skb_any(ch->xid_skb);
975
976 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
977 GFP_ATOMIC | GFP_DMA);
978 if (ch->xid_skb == NULL) {
979 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
980 "%s(%s): Couldn't alloc ch xid_skb\n",
981 CTCM_FUNTAIL, dev->name);
982 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
983 return;
984 }
985 ch->xid_skb_data = ch->xid_skb->data;
986 ch->xid_th = (struct th_header *)ch->xid_skb->data;
987 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
988 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
989 skb_put(ch->xid_skb, XID2_LENGTH);
990 ch->xid_id = skb_tail_pointer(ch->xid_skb);
991 ch->xid_skb->data = ch->xid_skb_data;
992 skb_reset_tail_pointer(ch->xid_skb);
993 ch->xid_skb->len = 0;
994
995 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
996 grp->xid_skb->data,
997 grp->xid_skb->len);
998
999 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ)
1000 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
1001
1002 if (CHANNEL_DIRECTION(ch->flags) == WRITE)
1003 ch->xid->xid2_buf_len = 0x00;
1004
1005 ch->xid_skb->data = ch->xid_skb_data;
1006 skb_reset_tail_pointer(ch->xid_skb);
1007 ch->xid_skb->len = 0;
1008
1009 fsm_newstate(ch->fsm, CH_XID0_PENDING);
1010
1011 if ((grp->active_channels[READ] > 0) &&
1012 (grp->active_channels[WRITE] > 0) &&
1013 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
1014 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1015 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1016 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1017 __func__, dev->name);
1018 }
1019 } else if ((action == MPC_CHANNEL_REMOVE) &&
1020 (ch->in_mpcgroup == 1)) {
1021 ch->in_mpcgroup = 0;
1022 grp->num_channel_paths--;
1023 grp->active_channels[direction]--;
1024
1025 if (ch->xid_skb != NULL)
1026 dev_kfree_skb_any(ch->xid_skb);
1027 ch->xid_skb = NULL;
1028
1029 if (grp->channels_terminating)
1030 goto done;
1031
1032 if (((grp->active_channels[READ] == 0) &&
1033 (grp->active_channels[WRITE] > 0))
1034 || ((grp->active_channels[WRITE] == 0) &&
1035 (grp->active_channels[READ] > 0)))
1036 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1037 }
1038 done:
1039 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1040 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1041 "read=%i, write=%i\n", __func__, action,
1042 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1043 grp->active_channels[READ], grp->active_channels[WRITE]);
1044
1045 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1046 }
1047
1048 /**
1049 * Unpack a just received skb and hand it over to
1050 * upper layers.
1051 * special MPC version of unpack_skb.
1052 *
1053 * ch The channel where this skb has been received.
1054 * pskb The received skb.
1055 */
1056 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1057 {
1058 struct net_device *dev = ch->netdev;
1059 struct ctcm_priv *priv = dev->ml_priv;
1060 struct mpc_group *grp = priv->mpcg;
1061 struct pdu *curr_pdu;
1062 struct mpcg_info *mpcginfo;
1063 struct th_header *header = NULL;
1064 struct th_sweep *sweep = NULL;
1065 int pdu_last_seen = 0;
1066 __u32 new_len;
1067 struct sk_buff *skb;
1068 int skblen;
1069 int sendrc = 0;
1070
1071 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1072 __func__, dev->name, smp_processor_id(), ch->id);
1073
1074 header = (struct th_header *)pskb->data;
1075 if ((header->th_seg == 0) &&
1076 (header->th_ch_flag == 0) &&
1077 (header->th_blk_flag == 0) &&
1078 (header->th_seq_num == 0))
1079 /* nothing for us */ goto done;
1080
1081 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1082 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1083 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1084
1085 pskb->dev = dev;
1086 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1087 skb_pull(pskb, TH_HEADER_LENGTH);
1088
1089 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1090 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1091 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1092 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1093 (header->th_seq_num != ch->th_seq_num + 1) &&
1094 (ch->th_seq_num != 0))) {
1095 /* This is NOT the next segment *
1096 * we are not the correct race winner *
1097 * go away and let someone else win *
1098 * BUT..this only applies if xid negot *
1099 * is done *
1100 */
1101 grp->out_of_sequence += 1;
1102 __skb_push(pskb, TH_HEADER_LENGTH);
1103 skb_queue_tail(&ch->io_queue, pskb);
1104 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1105 "got:%08x\n", __func__,
1106 ch->th_seq_num + 1, header->th_seq_num);
1107
1108 return;
1109 }
1110 grp->out_of_sequence = 0;
1111 ch->th_seq_num = header->th_seq_num;
1112
1113 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1114 __func__, ch->th_seq_num);
1115
1116 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1117 goto done;
1118 while ((pskb->len > 0) && !pdu_last_seen) {
1119 curr_pdu = (struct pdu *)pskb->data;
1120
1121 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1122 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1123 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1124 __func__, pskb->len);
1125
1126 skb_pull(pskb, PDU_HEADER_LENGTH);
1127
1128 if (curr_pdu->pdu_flag & PDU_LAST)
1129 pdu_last_seen = 1;
1130 if (curr_pdu->pdu_flag & PDU_CNTL)
1131 pskb->protocol = htons(ETH_P_SNAP);
1132 else
1133 pskb->protocol = htons(ETH_P_SNA_DIX);
1134
1135 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137 "%s(%s): Dropping packet with "
1138 "illegal siize %d",
1139 CTCM_FUNTAIL, dev->name, pskb->len);
1140
1141 priv->stats.rx_dropped++;
1142 priv->stats.rx_length_errors++;
1143 goto done;
1144 }
1145 skb_reset_mac_header(pskb);
1146 new_len = curr_pdu->pdu_offset;
1147 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1148 __func__, new_len);
1149 if ((new_len == 0) || (new_len > pskb->len)) {
1150 /* should never happen */
1151 /* pskb len must be hosed...bail out */
1152 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1153 "%s(%s): non valid pdu_offset: %04x",
1154 /* "data may be lost", */
1155 CTCM_FUNTAIL, dev->name, new_len);
1156 goto done;
1157 }
1158 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1159
1160 if (!skb) {
1161 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1162 "%s(%s): MEMORY allocation error",
1163 CTCM_FUNTAIL, dev->name);
1164 priv->stats.rx_dropped++;
1165 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1166 goto done;
1167 }
1168 memcpy(skb_put(skb, new_len), pskb->data, new_len);
1169
1170 skb_reset_mac_header(skb);
1171 skb->dev = pskb->dev;
1172 skb->protocol = pskb->protocol;
1173 skb->ip_summed = CHECKSUM_UNNECESSARY;
1174 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1175 ch->pdu_seq++;
1176
1177 if (do_debug_data) {
1178 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1179 __func__, ch->pdu_seq);
1180 ctcm_pr_debug("%s: skb:%0lx "
1181 "skb len: %d \n", __func__,
1182 (unsigned long)skb, skb->len);
1183 ctcm_pr_debug("%s: up to 32 bytes "
1184 "of pdu_data sent\n", __func__);
1185 ctcmpc_dump32((char *)skb->data, skb->len);
1186 }
1187
1188 skblen = skb->len;
1189 sendrc = netif_rx(skb);
1190 priv->stats.rx_packets++;
1191 priv->stats.rx_bytes += skblen;
1192 skb_pull(pskb, new_len); /* point to next PDU */
1193 }
1194 } else {
1195 mpcginfo = (struct mpcg_info *)
1196 kmalloc(sizeof(struct mpcg_info), gfp_type());
1197 if (mpcginfo == NULL)
1198 goto done;
1199
1200 mpcginfo->ch = ch;
1201 mpcginfo->th = header;
1202 mpcginfo->skb = pskb;
1203 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1204 __func__);
1205 /* it's a sweep? */
1206 sweep = (struct th_sweep *)pskb->data;
1207 mpcginfo->sweep = sweep;
1208 if (header->th_ch_flag == TH_SWEEP_REQ)
1209 mpc_rcvd_sweep_req(mpcginfo);
1210 else if (header->th_ch_flag == TH_SWEEP_RESP)
1211 mpc_rcvd_sweep_resp(mpcginfo);
1212 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1213 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1214 skb_pull(pskb, XID2_LENGTH);
1215 mpcginfo->xid = thisxid;
1216 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1217 } else if (header->th_blk_flag == TH_DISCONTACT)
1218 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1219 else if (header->th_seq_num != 0) {
1220 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1221 "%s(%s): control pkt expected\n",
1222 CTCM_FUNTAIL, dev->name);
1223 priv->stats.rx_dropped++;
1224 /* mpcginfo only used for non-data transfers */
1225 kfree(mpcginfo);
1226 if (do_debug_data)
1227 ctcmpc_dump_skb(pskb, -8);
1228 }
1229 }
1230 done:
1231
1232 dev_kfree_skb_any(pskb);
1233 if (sendrc == NET_RX_DROP) {
1234 dev_warn(&dev->dev,
1235 "The network backlog for %s is exceeded, "
1236 "package dropped\n", __func__);
1237 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1238 }
1239
1240 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1241 __func__, dev->name, ch, ch->id);
1242 }
1243
1244 /**
1245 * tasklet helper for mpc's skb unpacking.
1246 *
1247 * ch The channel to work on.
1248 * Allow flow control back pressure to occur here.
1249 * Throttling back channel can result in excessive
1250 * channel inactivity and system deact of channel
1251 */
1252 void ctcmpc_bh(unsigned long thischan)
1253 {
1254 struct channel *ch = (struct channel *)thischan;
1255 struct sk_buff *skb;
1256 struct net_device *dev = ch->netdev;
1257 struct ctcm_priv *priv = dev->ml_priv;
1258 struct mpc_group *grp = priv->mpcg;
1259
1260 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1261 dev->name, smp_processor_id(), __func__, ch->id);
1262 /* caller has requested driver to throttle back */
1263 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1264 (skb = skb_dequeue(&ch->io_queue))) {
1265 ctcmpc_unpack_skb(ch, skb);
1266 if (grp->out_of_sequence > 20) {
1267 /* assume data loss has occurred if */
1268 /* missing seq_num for extended */
1269 /* period of time */
1270 grp->out_of_sequence = 0;
1271 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1272 break;
1273 }
1274 if (skb == skb_peek(&ch->io_queue))
1275 break;
1276 }
1277 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1278 __func__, dev->name, ch, ch->id);
1279 return;
1280 }
1281
1282 /*
1283 * MPC Group Initializations
1284 */
1285 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1286 {
1287 struct mpc_group *grp;
1288
1289 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1290 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1291
1292 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1293 if (grp == NULL)
1294 return NULL;
1295
1296 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1297 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1298 mpcg_fsm_len, GFP_KERNEL);
1299 if (grp->fsm == NULL) {
1300 kfree(grp);
1301 return NULL;
1302 }
1303
1304 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1305 fsm_settimer(grp->fsm, &grp->timer);
1306
1307 grp->xid_skb =
1308 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1309 if (grp->xid_skb == NULL) {
1310 kfree_fsm(grp->fsm);
1311 kfree(grp);
1312 return NULL;
1313 }
1314 /* base xid for all channels in group */
1315 grp->xid_skb_data = grp->xid_skb->data;
1316 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1317 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1318 &thnorm, TH_HEADER_LENGTH);
1319
1320 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1321 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1322 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1323 grp->xid->xid2_sender_id = jiffies;
1324
1325 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1326 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1327
1328 grp->rcvd_xid_skb =
1329 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1330 if (grp->rcvd_xid_skb == NULL) {
1331 kfree_fsm(grp->fsm);
1332 dev_kfree_skb(grp->xid_skb);
1333 kfree(grp);
1334 return NULL;
1335 }
1336 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1337 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1338 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1339 &thnorm, TH_HEADER_LENGTH);
1340 grp->saved_xid2 = NULL;
1341 priv->xid = grp->xid;
1342 priv->mpcg = grp;
1343 return grp;
1344 }
1345
1346 /*
1347 * The MPC Group Station FSM
1348 */
1349
1350 /*
1351 * MPC Group Station FSM actions
1352 * CTCM_PROTO_MPC only
1353 */
1354
1355 /**
1356 * NOP action for statemachines
1357 */
1358 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1359 {
1360 }
1361
1362 /*
1363 * invoked when the device transitions to dev_stopped
1364 * MPC will stop each individual channel if a single XID failure
1365 * occurs, or will intitiate all channels be stopped if a GROUP
1366 * level failure occurs.
1367 */
1368 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1369 {
1370 struct net_device *dev = arg;
1371 struct ctcm_priv *priv;
1372 struct mpc_group *grp;
1373 int rc = 0;
1374 struct channel *wch, *rch;
1375
1376 BUG_ON(dev == NULL);
1377 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1378
1379 priv = dev->ml_priv;
1380 grp = priv->mpcg;
1381 grp->flow_off_called = 0;
1382 fsm_deltimer(&grp->timer);
1383 if (grp->channels_terminating)
1384 return;
1385
1386 grp->channels_terminating = 1;
1387 grp->saved_state = fsm_getstate(grp->fsm);
1388 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1389 if (grp->saved_state > MPCG_STATE_XID7INITF)
1390 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1391 "%s(%s): MPC GROUP INOPERATIVE",
1392 CTCM_FUNTAIL, dev->name);
1393 if ((grp->saved_state != MPCG_STATE_RESET) ||
1394 /* dealloc_channel has been called */
1395 (grp->port_persist == 0))
1396 fsm_deltimer(&priv->restart_timer);
1397
1398 wch = priv->channel[WRITE];
1399 rch = priv->channel[READ];
1400
1401 switch (grp->saved_state) {
1402 case MPCG_STATE_RESET:
1403 case MPCG_STATE_INOP:
1404 case MPCG_STATE_XID2INITW:
1405 case MPCG_STATE_XID0IOWAIT:
1406 case MPCG_STATE_XID2INITX:
1407 case MPCG_STATE_XID7INITW:
1408 case MPCG_STATE_XID7INITX:
1409 case MPCG_STATE_XID0IOWAIX:
1410 case MPCG_STATE_XID7INITI:
1411 case MPCG_STATE_XID7INITZ:
1412 case MPCG_STATE_XID7INITF:
1413 break;
1414 case MPCG_STATE_FLOWC:
1415 case MPCG_STATE_READY:
1416 default:
1417 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1418 }
1419
1420 grp->xid2_tgnum = 0;
1421 grp->group_max_buflen = 0; /*min of all received */
1422 grp->outstanding_xid2 = 0;
1423 grp->outstanding_xid7 = 0;
1424 grp->outstanding_xid7_p2 = 0;
1425 grp->saved_xid2 = NULL;
1426 grp->xidnogood = 0;
1427 grp->changed_side = 0;
1428
1429 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1430 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1431 grp->rcvd_xid_skb->len = 0;
1432 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1433 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1434 TH_HEADER_LENGTH);
1435
1436 if (grp->send_qllc_disc == 1) {
1437 grp->send_qllc_disc = 0;
1438 rc = mpc_send_qllc_discontact(dev);
1439 }
1440
1441 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1442 /* This can result in INOP of VTAM PU due to halting of */
1443 /* outstanding IO which causes a sense to be returned */
1444 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1445 /* become unreachable without manual intervention */
1446 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1447 grp->alloc_called = 0;
1448 fsm_deltimer(&priv->restart_timer);
1449 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1450 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1451 if (grp->saved_state > MPCG_STATE_XID7INITF)
1452 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1453 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1454 CTCM_FUNTAIL, dev->name);
1455 } else {
1456 fsm_deltimer(&priv->restart_timer);
1457 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1458 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1459 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1460 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1461 CTCM_FUNTAIL, dev->name);
1462 }
1463 }
1464
1465 /**
1466 * Handle mpc group action timeout.
1467 * MPC Group Station FSM action
1468 * CTCM_PROTO_MPC only
1469 *
1470 * fi An instance of an mpc_group fsm.
1471 * event The event, just happened.
1472 * arg Generic pointer, casted from net_device * upon call.
1473 */
1474 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1475 {
1476 struct net_device *dev = arg;
1477 struct ctcm_priv *priv;
1478 struct mpc_group *grp;
1479 struct channel *wch;
1480 struct channel *rch;
1481
1482 BUG_ON(dev == NULL);
1483
1484 priv = dev->ml_priv;
1485 grp = priv->mpcg;
1486 wch = priv->channel[WRITE];
1487 rch = priv->channel[READ];
1488
1489 switch (fsm_getstate(grp->fsm)) {
1490 case MPCG_STATE_XID2INITW:
1491 /* Unless there is outstanding IO on the */
1492 /* channel just return and wait for ATTN */
1493 /* interrupt to begin XID negotiations */
1494 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1495 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1496 break;
1497 default:
1498 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1499 }
1500
1501 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1502 "%s: dev=%s exit",
1503 CTCM_FUNTAIL, dev->name);
1504 return;
1505 }
1506
1507 /*
1508 * MPC Group Station FSM action
1509 * CTCM_PROTO_MPC only
1510 */
1511 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1512 {
1513 struct mpcg_info *mpcginfo = arg;
1514 struct channel *ch = mpcginfo->ch;
1515 struct net_device *dev;
1516 struct ctcm_priv *priv;
1517 struct mpc_group *grp;
1518
1519 if (ch) {
1520 dev = ch->netdev;
1521 if (dev) {
1522 priv = dev->ml_priv;
1523 if (priv) {
1524 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1525 "%s: %s: %s\n",
1526 CTCM_FUNTAIL, dev->name, ch->id);
1527 grp = priv->mpcg;
1528 grp->send_qllc_disc = 1;
1529 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1530 }
1531 }
1532 }
1533
1534 return;
1535 }
1536
1537 /*
1538 * MPC Group Station - not part of FSM
1539 * CTCM_PROTO_MPC only
1540 * called from add_channel in ctcm_main.c
1541 */
1542 void mpc_action_send_discontact(unsigned long thischan)
1543 {
1544 int rc;
1545 struct channel *ch = (struct channel *)thischan;
1546 unsigned long saveflags = 0;
1547
1548 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1549 rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1550 (unsigned long)ch, 0xff, 0);
1551 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1552
1553 if (rc != 0) {
1554 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1555 }
1556
1557 return;
1558 }
1559
1560
1561 /*
1562 * helper function of mpc FSM
1563 * CTCM_PROTO_MPC only
1564 * mpc_action_rcvd_xid7
1565 */
1566 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1567 {
1568 struct channel *ch = mpcginfo->ch;
1569 struct net_device *dev = ch->netdev;
1570 struct ctcm_priv *priv = dev->ml_priv;
1571 struct mpc_group *grp = priv->mpcg;
1572 struct xid2 *xid = mpcginfo->xid;
1573 int rc = 0;
1574 __u64 our_id = 0;
1575 __u64 their_id = 0;
1576 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1577
1578 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1579
1580 if (xid == NULL) {
1581 rc = 1;
1582 /* XID REJECTED: xid == NULL */
1583 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1584 "%s(%s): xid = NULL",
1585 CTCM_FUNTAIL, ch->id);
1586 goto done;
1587 }
1588
1589 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1590
1591 /*the received direction should be the opposite of ours */
1592 if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE :
1593 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1594 rc = 2;
1595 /* XID REJECTED: r/w channel pairing mismatch */
1596 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1597 "%s(%s): r/w channel pairing mismatch",
1598 CTCM_FUNTAIL, ch->id);
1599 goto done;
1600 }
1601
1602 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1603 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1604 grp->group_max_buflen, xid->xid2_buf_len);
1605
1606 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1607 xid->xid2_buf_len - len)
1608 grp->group_max_buflen = xid->xid2_buf_len - len;
1609 }
1610
1611 if (grp->saved_xid2 == NULL) {
1612 grp->saved_xid2 =
1613 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1614
1615 memcpy(skb_put(grp->rcvd_xid_skb,
1616 XID2_LENGTH), xid, XID2_LENGTH);
1617 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1618
1619 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1620 grp->rcvd_xid_skb->len = 0;
1621
1622 /* convert two 32 bit numbers into 1 64 bit for id compare */
1623 our_id = (__u64)priv->xid->xid2_adj_id;
1624 our_id = our_id << 32;
1625 our_id = our_id + priv->xid->xid2_sender_id;
1626 their_id = (__u64)xid->xid2_adj_id;
1627 their_id = their_id << 32;
1628 their_id = their_id + xid->xid2_sender_id;
1629 /* lower id assume the xside role */
1630 if (our_id < their_id) {
1631 grp->roll = XSIDE;
1632 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1633 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1634 CTCM_FUNTAIL, ch->id);
1635 } else {
1636 grp->roll = YSIDE;
1637 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1638 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1639 CTCM_FUNTAIL, ch->id);
1640 }
1641
1642 } else {
1643 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1644 rc = 3;
1645 /* XID REJECTED: xid flag byte4 mismatch */
1646 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1647 "%s(%s): xid flag byte4 mismatch",
1648 CTCM_FUNTAIL, ch->id);
1649 }
1650 if (xid->xid2_flag2 == 0x40) {
1651 rc = 4;
1652 /* XID REJECTED - xid NOGOOD */
1653 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1654 "%s(%s): xid NOGOOD",
1655 CTCM_FUNTAIL, ch->id);
1656 }
1657 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1658 rc = 5;
1659 /* XID REJECTED - Adjacent Station ID Mismatch */
1660 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1661 "%s(%s): Adjacent Station ID Mismatch",
1662 CTCM_FUNTAIL, ch->id);
1663 }
1664 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1665 rc = 6;
1666 /* XID REJECTED - Sender Address Mismatch */
1667 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1668 "%s(%s): Sender Address Mismatch",
1669 CTCM_FUNTAIL, ch->id);
1670 }
1671 }
1672 done:
1673 if (rc) {
1674 dev_warn(&dev->dev,
1675 "The XID used in the MPC protocol is not valid, "
1676 "rc = %d\n", rc);
1677 priv->xid->xid2_flag2 = 0x40;
1678 grp->saved_xid2->xid2_flag2 = 0x40;
1679 }
1680
1681 return rc;
1682 }
1683
1684 /*
1685 * MPC Group Station FSM action
1686 * CTCM_PROTO_MPC only
1687 */
1688 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1689 {
1690 struct channel *ch = arg;
1691 int rc = 0;
1692 int gotlock = 0;
1693 unsigned long saveflags = 0; /* avoids compiler warning with
1694 spin_unlock_irqrestore */
1695
1696 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1697 __func__, smp_processor_id(), ch, ch->id);
1698
1699 if (ctcm_checkalloc_buffer(ch))
1700 goto done;
1701
1702 /*
1703 * skb data-buffer referencing:
1704 */
1705 ch->trans_skb->data = ch->trans_skb_data;
1706 skb_reset_tail_pointer(ch->trans_skb);
1707 ch->trans_skb->len = 0;
1708 /* result of the previous 3 statements is NOT always
1709 * already set after ctcm_checkalloc_buffer
1710 * because of possible reuse of the trans_skb
1711 */
1712 memset(ch->trans_skb->data, 0, 16);
1713 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1714 /* check is main purpose here: */
1715 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1716 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1717 /* check is main purpose here: */
1718 skb_put(ch->trans_skb, XID2_LENGTH);
1719 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1720 /* cleanup back to startpoint */
1721 ch->trans_skb->data = ch->trans_skb_data;
1722 skb_reset_tail_pointer(ch->trans_skb);
1723 ch->trans_skb->len = 0;
1724
1725 /* non-checking rewrite of above skb data-buffer referencing: */
1726 /*
1727 memset(ch->trans_skb->data, 0, 16);
1728 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1729 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1730 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1731 */
1732
1733 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1734 ch->ccw[8].count = 0;
1735 ch->ccw[8].cda = 0x00;
1736
1737 if (!(ch->xid_th && ch->xid && ch->xid_id))
1738 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1739 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1740 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1741
1742 if (side == XSIDE) {
1743 /* mpc_action_xside_xid */
1744 if (ch->xid_th == NULL)
1745 goto done;
1746 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1747 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1748 ch->ccw[9].count = TH_HEADER_LENGTH;
1749 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1750
1751 if (ch->xid == NULL)
1752 goto done;
1753 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1754 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1755 ch->ccw[10].count = XID2_LENGTH;
1756 ch->ccw[10].cda = virt_to_phys(ch->xid);
1757
1758 ch->ccw[11].cmd_code = CCW_CMD_READ;
1759 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1760 ch->ccw[11].count = TH_HEADER_LENGTH;
1761 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1762
1763 ch->ccw[12].cmd_code = CCW_CMD_READ;
1764 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1765 ch->ccw[12].count = XID2_LENGTH;
1766 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1767
1768 ch->ccw[13].cmd_code = CCW_CMD_READ;
1769 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1770
1771 } else { /* side == YSIDE : mpc_action_yside_xid */
1772 ch->ccw[9].cmd_code = CCW_CMD_READ;
1773 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1774 ch->ccw[9].count = TH_HEADER_LENGTH;
1775 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1776
1777 ch->ccw[10].cmd_code = CCW_CMD_READ;
1778 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1779 ch->ccw[10].count = XID2_LENGTH;
1780 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1781
1782 if (ch->xid_th == NULL)
1783 goto done;
1784 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1785 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1786 ch->ccw[11].count = TH_HEADER_LENGTH;
1787 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1788
1789 if (ch->xid == NULL)
1790 goto done;
1791 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1792 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1793 ch->ccw[12].count = XID2_LENGTH;
1794 ch->ccw[12].cda = virt_to_phys(ch->xid);
1795
1796 if (ch->xid_id == NULL)
1797 goto done;
1798 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1799 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1800
1801 }
1802 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1803 ch->ccw[13].count = 4;
1804
1805 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1806 ch->ccw[14].flags = CCW_FLAG_SLI;
1807 ch->ccw[14].count = 0;
1808 ch->ccw[14].cda = 0;
1809
1810 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1811 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1812 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1813 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1814
1815 if (!in_irq()) {
1816 /* Such conditional locking is a known problem for
1817 * sparse because its static undeterministic.
1818 * Warnings should be ignored here. */
1819 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1820 gotlock = 1;
1821 }
1822
1823 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1824 rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1825 (unsigned long)ch, 0xff, 0);
1826
1827 if (gotlock) /* see remark above about conditional locking */
1828 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1829
1830 if (rc != 0) {
1831 ctcm_ccw_check_rc(ch, rc,
1832 (side == XSIDE) ? "x-side XID" : "y-side XID");
1833 }
1834
1835 done:
1836 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1837 __func__, ch, ch->id);
1838 return;
1839
1840 }
1841
1842 /*
1843 * MPC Group Station FSM action
1844 * CTCM_PROTO_MPC only
1845 */
1846 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1847 {
1848 mpc_action_side_xid(fsm, arg, XSIDE);
1849 }
1850
1851 /*
1852 * MPC Group Station FSM action
1853 * CTCM_PROTO_MPC only
1854 */
1855 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1856 {
1857 mpc_action_side_xid(fsm, arg, YSIDE);
1858 }
1859
1860 /*
1861 * MPC Group Station FSM action
1862 * CTCM_PROTO_MPC only
1863 */
1864 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1865 {
1866 struct channel *ch = arg;
1867 struct net_device *dev = ch->netdev;
1868 struct ctcm_priv *priv = dev->ml_priv;
1869 struct mpc_group *grp = priv->mpcg;
1870
1871 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1872 __func__, smp_processor_id(), ch, ch->id);
1873
1874 if (ch->xid == NULL) {
1875 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1876 "%s(%s): ch->xid == NULL",
1877 CTCM_FUNTAIL, dev->name);
1878 return;
1879 }
1880
1881 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1882
1883 ch->xid->xid2_option = XID2_0;
1884
1885 switch (fsm_getstate(grp->fsm)) {
1886 case MPCG_STATE_XID2INITW:
1887 case MPCG_STATE_XID2INITX:
1888 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1889 break;
1890 case MPCG_STATE_XID0IOWAIT:
1891 case MPCG_STATE_XID0IOWAIX:
1892 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1893 break;
1894 }
1895
1896 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1897
1898 return;
1899 }
1900
1901 /*
1902 * MPC Group Station FSM action
1903 * CTCM_PROTO_MPC only
1904 */
1905 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1906 {
1907 struct net_device *dev = arg;
1908 struct ctcm_priv *priv = dev->ml_priv;
1909 struct mpc_group *grp = NULL;
1910 int direction;
1911 int send = 0;
1912
1913 if (priv)
1914 grp = priv->mpcg;
1915 if (grp == NULL)
1916 return;
1917
1918 for (direction = READ; direction <= WRITE; direction++) {
1919 struct channel *ch = priv->channel[direction];
1920 struct xid2 *thisxid = ch->xid;
1921 ch->xid_skb->data = ch->xid_skb_data;
1922 skb_reset_tail_pointer(ch->xid_skb);
1923 ch->xid_skb->len = 0;
1924 thisxid->xid2_option = XID2_7;
1925 send = 0;
1926
1927 /* xid7 phase 1 */
1928 if (grp->outstanding_xid7_p2 > 0) {
1929 if (grp->roll == YSIDE) {
1930 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1931 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1932 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1933 memcpy(skb_put(ch->xid_skb,
1934 TH_HEADER_LENGTH),
1935 &thdummy, TH_HEADER_LENGTH);
1936 send = 1;
1937 }
1938 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1939 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1940 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1941 memcpy(skb_put(ch->xid_skb,
1942 TH_HEADER_LENGTH),
1943 &thnorm, TH_HEADER_LENGTH);
1944 send = 1;
1945 }
1946 } else {
1947 /* xid7 phase 2 */
1948 if (grp->roll == YSIDE) {
1949 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1950 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1951 memcpy(skb_put(ch->xid_skb,
1952 TH_HEADER_LENGTH),
1953 &thnorm, TH_HEADER_LENGTH);
1954 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1955 send = 1;
1956 }
1957 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1958 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1959 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1960 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1961 &thdummy, TH_HEADER_LENGTH);
1962 send = 1;
1963 }
1964 }
1965
1966 if (send)
1967 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1968 }
1969
1970 return;
1971 }
1972
1973 /*
1974 * MPC Group Station FSM action
1975 * CTCM_PROTO_MPC only
1976 */
1977 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1978 {
1979
1980 struct mpcg_info *mpcginfo = arg;
1981 struct channel *ch = mpcginfo->ch;
1982 struct net_device *dev = ch->netdev;
1983 struct ctcm_priv *priv = dev->ml_priv;
1984 struct mpc_group *grp = priv->mpcg;
1985
1986 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1987 __func__, ch->id, grp->outstanding_xid2,
1988 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1989
1990 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1991 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1992
1993 grp->outstanding_xid2--;
1994 grp->outstanding_xid7++;
1995 grp->outstanding_xid7_p2++;
1996
1997 /* must change state before validating xid to */
1998 /* properly handle interim interrupts received*/
1999 switch (fsm_getstate(grp->fsm)) {
2000 case MPCG_STATE_XID2INITW:
2001 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
2002 mpc_validate_xid(mpcginfo);
2003 break;
2004 case MPCG_STATE_XID0IOWAIT:
2005 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
2006 mpc_validate_xid(mpcginfo);
2007 break;
2008 case MPCG_STATE_XID2INITX:
2009 if (grp->outstanding_xid2 == 0) {
2010 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
2011 mpc_validate_xid(mpcginfo);
2012 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2013 }
2014 break;
2015 case MPCG_STATE_XID0IOWAIX:
2016 if (grp->outstanding_xid2 == 0) {
2017 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
2018 mpc_validate_xid(mpcginfo);
2019 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2020 }
2021 break;
2022 }
2023 kfree(mpcginfo);
2024
2025 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2026 __func__, ch->id, grp->outstanding_xid2,
2027 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2028 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2029 __func__, ch->id,
2030 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2031 return;
2032
2033 }
2034
2035
2036 /*
2037 * MPC Group Station FSM action
2038 * CTCM_PROTO_MPC only
2039 */
2040 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2041 {
2042 struct mpcg_info *mpcginfo = arg;
2043 struct channel *ch = mpcginfo->ch;
2044 struct net_device *dev = ch->netdev;
2045 struct ctcm_priv *priv = dev->ml_priv;
2046 struct mpc_group *grp = priv->mpcg;
2047
2048 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2049 __func__, smp_processor_id(), ch, ch->id);
2050 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2051 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2052
2053 grp->outstanding_xid7--;
2054 ch->xid_skb->data = ch->xid_skb_data;
2055 skb_reset_tail_pointer(ch->xid_skb);
2056 ch->xid_skb->len = 0;
2057
2058 switch (fsm_getstate(grp->fsm)) {
2059 case MPCG_STATE_XID7INITI:
2060 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2061 mpc_validate_xid(mpcginfo);
2062 break;
2063 case MPCG_STATE_XID7INITW:
2064 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2065 mpc_validate_xid(mpcginfo);
2066 break;
2067 case MPCG_STATE_XID7INITZ:
2068 case MPCG_STATE_XID7INITX:
2069 if (grp->outstanding_xid7 == 0) {
2070 if (grp->outstanding_xid7_p2 > 0) {
2071 grp->outstanding_xid7 =
2072 grp->outstanding_xid7_p2;
2073 grp->outstanding_xid7_p2 = 0;
2074 } else
2075 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2076
2077 mpc_validate_xid(mpcginfo);
2078 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2079 break;
2080 }
2081 mpc_validate_xid(mpcginfo);
2082 break;
2083 }
2084 kfree(mpcginfo);
2085 return;
2086 }
2087
2088 /*
2089 * mpc_action helper of an MPC Group Station FSM action
2090 * CTCM_PROTO_MPC only
2091 */
2092 static int mpc_send_qllc_discontact(struct net_device *dev)
2093 {
2094 __u32 new_len = 0;
2095 struct sk_buff *skb;
2096 struct qllc *qllcptr;
2097 struct ctcm_priv *priv = dev->ml_priv;
2098 struct mpc_group *grp = priv->mpcg;
2099
2100 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2101 __func__, mpcg_state_names[grp->saved_state]);
2102
2103 switch (grp->saved_state) {
2104 /*
2105 * establish conn callback function is
2106 * preferred method to report failure
2107 */
2108 case MPCG_STATE_XID0IOWAIT:
2109 case MPCG_STATE_XID0IOWAIX:
2110 case MPCG_STATE_XID7INITI:
2111 case MPCG_STATE_XID7INITZ:
2112 case MPCG_STATE_XID2INITW:
2113 case MPCG_STATE_XID2INITX:
2114 case MPCG_STATE_XID7INITW:
2115 case MPCG_STATE_XID7INITX:
2116 if (grp->estconnfunc) {
2117 grp->estconnfunc(grp->port_num, -1, 0);
2118 grp->estconnfunc = NULL;
2119 break;
2120 }
2121 case MPCG_STATE_FLOWC:
2122 case MPCG_STATE_READY:
2123 grp->send_qllc_disc = 2;
2124 new_len = sizeof(struct qllc);
2125 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2126 if (qllcptr == NULL) {
2127 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2128 "%s(%s): qllcptr allocation error",
2129 CTCM_FUNTAIL, dev->name);
2130 return -ENOMEM;
2131 }
2132
2133 qllcptr->qllc_address = 0xcc;
2134 qllcptr->qllc_commands = 0x03;
2135
2136 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2137
2138 if (skb == NULL) {
2139 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2140 "%s(%s): skb allocation error",
2141 CTCM_FUNTAIL, dev->name);
2142 priv->stats.rx_dropped++;
2143 kfree(qllcptr);
2144 return -ENOMEM;
2145 }
2146
2147 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2148 kfree(qllcptr);
2149
2150 if (skb_headroom(skb) < 4) {
2151 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2152 "%s(%s): skb_headroom error",
2153 CTCM_FUNTAIL, dev->name);
2154 dev_kfree_skb_any(skb);
2155 return -ENOMEM;
2156 }
2157
2158 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq;
2159 priv->channel[READ]->pdu_seq++;
2160 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2161 __func__, priv->channel[READ]->pdu_seq);
2162
2163 /* receipt of CC03 resets anticipated sequence number on
2164 receiving side */
2165 priv->channel[READ]->pdu_seq = 0x00;
2166 skb_reset_mac_header(skb);
2167 skb->dev = dev;
2168 skb->protocol = htons(ETH_P_SNAP);
2169 skb->ip_summed = CHECKSUM_UNNECESSARY;
2170
2171 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2172
2173 netif_rx(skb);
2174 break;
2175 default:
2176 break;
2177
2178 }
2179
2180 return 0;
2181 }
2182 /* --- This is the END my friend --- */
2183
Linus' kernel tree