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License cleanup: add SPDX GPL-2.0 license identifier to files with no license
[thirdparty/kernel/linux.git] / drivers / s390 / net / ctcm_mpc.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2004, 2007
4 * Authors: Belinda Thompson (belindat@us.ibm.com)
5 * Andy Richter (richtera@us.ibm.com)
6 * Peter Tiedemann (ptiedem@de.ibm.com)
7 */
8
9 /*
10 This module exports functions to be used by CCS:
11 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
12 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
13 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
14 EXPORT_SYMBOL(ctc_mpc_flow_control);
15 */
16
17 #undef DEBUG
18 #undef DEBUGDATA
19 #undef DEBUGCCW
20
21 #define KMSG_COMPONENT "ctcm"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/interrupt.h>
31 #include <linux/timer.h>
32 #include <linux/sched.h>
33
34 #include <linux/signal.h>
35 #include <linux/string.h>
36 #include <linux/proc_fs.h>
37
38 #include <linux/ip.h>
39 #include <linux/if_arp.h>
40 #include <linux/tcp.h>
41 #include <linux/skbuff.h>
42 #include <linux/ctype.h>
43 #include <linux/netdevice.h>
44 #include <net/dst.h>
45
46 #include <linux/io.h> /* instead of <asm/io.h> ok ? */
47 #include <asm/ccwdev.h>
48 #include <asm/ccwgroup.h>
49 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */
50 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */
51 #include <linux/wait.h>
52 #include <linux/moduleparam.h>
53 #include <asm/idals.h>
54
55 #include "ctcm_main.h"
56 #include "ctcm_mpc.h"
57 #include "ctcm_fsms.h"
58
59 static const struct xid2 init_xid = {
60 .xid2_type_id = XID_FM2,
61 .xid2_len = 0x45,
62 .xid2_adj_id = 0,
63 .xid2_rlen = 0x31,
64 .xid2_resv1 = 0,
65 .xid2_flag1 = 0,
66 .xid2_fmtt = 0,
67 .xid2_flag4 = 0x80,
68 .xid2_resv2 = 0,
69 .xid2_tgnum = 0,
70 .xid2_sender_id = 0,
71 .xid2_flag2 = 0,
72 .xid2_option = XID2_0,
73 .xid2_resv3 = "\x00",
74 .xid2_resv4 = 0,
75 .xid2_dlc_type = XID2_READ_SIDE,
76 .xid2_resv5 = 0,
77 .xid2_mpc_flag = 0,
78 .xid2_resv6 = 0,
79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
80 };
81
82 static const struct th_header thnorm = {
83 .th_seg = 0x00,
84 .th_ch_flag = TH_IS_XID,
85 .th_blk_flag = TH_DATA_IS_XID,
86 .th_is_xid = 0x01,
87 .th_seq_num = 0x00000000,
88 };
89
90 static const struct th_header thdummy = {
91 .th_seg = 0x00,
92 .th_ch_flag = 0x00,
93 .th_blk_flag = TH_DATA_IS_XID,
94 .th_is_xid = 0x01,
95 .th_seq_num = 0x00000000,
96 };
97
98 /*
99 * Definition of one MPC group
100 */
101
102 /*
103 * Compatibility macros for busy handling
104 * of network devices.
105 */
106
107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
108
109 /*
110 * MPC Group state machine actions (static prototypes)
111 */
112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
116 static int mpc_validate_xid(struct mpcg_info *mpcginfo);
117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
123
124 #ifdef DEBUGDATA
125 /*-------------------------------------------------------------------*
126 * Dump buffer format *
127 * *
128 *--------------------------------------------------------------------*/
129 void ctcmpc_dumpit(char *buf, int len)
130 {
131 __u32 ct, sw, rm, dup;
132 char *ptr, *rptr;
133 char tbuf[82], tdup[82];
134 char addr[22];
135 char boff[12];
136 char bhex[82], duphex[82];
137 char basc[40];
138
139 sw = 0;
140 rptr = ptr = buf;
141 rm = 16;
142 duphex[0] = 0x00;
143 dup = 0;
144
145 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
146 if (sw == 0) {
147 sprintf(addr, "%16.16llx", (__u64)rptr);
148
149 sprintf(boff, "%4.4X", (__u32)ct);
150 bhex[0] = '\0';
151 basc[0] = '\0';
152 }
153 if ((sw == 4) || (sw == 12))
154 strcat(bhex, " ");
155 if (sw == 8)
156 strcat(bhex, " ");
157
158 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
159
160 tbuf[2] = '\0';
161 strcat(bhex, tbuf);
162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
163 basc[sw] = *ptr;
164 else
165 basc[sw] = '.';
166
167 basc[sw+1] = '\0';
168 sw++;
169 rm--;
170 if (sw != 16)
171 continue;
172 if ((strcmp(duphex, bhex)) != 0) {
173 if (dup != 0) {
174 sprintf(tdup,
175 "Duplicate as above to %s", addr);
176 ctcm_pr_debug(" --- %s ---\n",
177 tdup);
178 }
179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
180 addr, boff, bhex, basc);
181 dup = 0;
182 strcpy(duphex, bhex);
183 } else
184 dup++;
185
186 sw = 0;
187 rm = 16;
188 } /* endfor */
189
190 if (sw != 0) {
191 for ( ; rm > 0; rm--, sw++) {
192 if ((sw == 4) || (sw == 12))
193 strcat(bhex, " ");
194 if (sw == 8)
195 strcat(bhex, " ");
196 strcat(bhex, " ");
197 strcat(basc, " ");
198 }
199 if (dup != 0) {
200 sprintf(tdup, "Duplicate as above to %s", addr);
201 ctcm_pr_debug(" --- %s ---\n", tdup);
202 }
203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
204 addr, boff, bhex, basc);
205 } else {
206 if (dup >= 1) {
207 sprintf(tdup, "Duplicate as above to %s", addr);
208 ctcm_pr_debug(" --- %s ---\n", tdup);
209 }
210 if (dup != 0) {
211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
212 addr, boff, bhex, basc);
213 }
214 }
215
216 return;
217
218 } /* end of ctcmpc_dumpit */
219 #endif
220
221 #ifdef DEBUGDATA
222 /*
223 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
224 *
225 * skb The sk_buff to dump.
226 * offset Offset relative to skb-data, where to start the dump.
227 */
228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
229 {
230 __u8 *p = skb->data;
231 struct th_header *header;
232 struct pdu *pheader;
233 int bl = skb->len;
234 int i;
235
236 if (p == NULL)
237 return;
238
239 p += offset;
240 header = (struct th_header *)p;
241
242 ctcm_pr_debug("dump:\n");
243 ctcm_pr_debug("skb len=%d \n", skb->len);
244 if (skb->len > 2) {
245 switch (header->th_ch_flag) {
246 case TH_HAS_PDU:
247 break;
248 case 0x00:
249 case TH_IS_XID:
250 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
251 (header->th_is_xid == 0x01))
252 goto dumpth;
253 case TH_SWEEP_REQ:
254 goto dumpth;
255 case TH_SWEEP_RESP:
256 goto dumpth;
257 default:
258 break;
259 }
260
261 pheader = (struct pdu *)p;
262 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
263 pheader->pdu_offset, pheader->pdu_offset);
264 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
265 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
266 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
267 goto dumpdata;
268
269 dumpth:
270 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
271 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
272 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
273 ctcm_pr_debug("th->type : %s\n",
274 (header->th_is_xid) ? "DATA" : "XID");
275 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
276
277 }
278 dumpdata:
279 if (bl > 32)
280 bl = 32;
281 ctcm_pr_debug("data: ");
282 for (i = 0; i < bl; i++)
283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
284 ctcm_pr_debug("\n");
285 }
286 #endif
287
288 static struct net_device *ctcmpc_get_dev(int port_num)
289 {
290 char device[20];
291 struct net_device *dev;
292 struct ctcm_priv *priv;
293
294 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
295
296 dev = __dev_get_by_name(&init_net, device);
297
298 if (dev == NULL) {
299 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
300 "%s: Device not found by name: %s",
301 CTCM_FUNTAIL, device);
302 return NULL;
303 }
304 priv = dev->ml_priv;
305 if (priv == NULL) {
306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
307 "%s(%s): dev->ml_priv is NULL",
308 CTCM_FUNTAIL, device);
309 return NULL;
310 }
311 if (priv->mpcg == NULL) {
312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
313 "%s(%s): priv->mpcg is NULL",
314 CTCM_FUNTAIL, device);
315 return NULL;
316 }
317 return dev;
318 }
319
320 /*
321 * ctc_mpc_alloc_channel
322 * (exported interface)
323 *
324 * Device Initialization :
325 * ACTPATH driven IO operations
326 */
327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
328 {
329 struct net_device *dev;
330 struct mpc_group *grp;
331 struct ctcm_priv *priv;
332
333 dev = ctcmpc_get_dev(port_num);
334 if (dev == NULL)
335 return 1;
336 priv = dev->ml_priv;
337 grp = priv->mpcg;
338
339 grp->allochanfunc = callback;
340 grp->port_num = port_num;
341 grp->port_persist = 1;
342
343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
344 "%s(%s): state=%s",
345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
346
347 switch (fsm_getstate(grp->fsm)) {
348 case MPCG_STATE_INOP:
349 /* Group is in the process of terminating */
350 grp->alloc_called = 1;
351 break;
352 case MPCG_STATE_RESET:
353 /* MPC Group will transition to state */
354 /* MPCG_STATE_XID2INITW iff the minimum number */
355 /* of 1 read and 1 write channel have successfully*/
356 /* activated */
357 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
358 if (callback)
359 grp->send_qllc_disc = 1;
360 case MPCG_STATE_XID0IOWAIT:
361 fsm_deltimer(&grp->timer);
362 grp->outstanding_xid2 = 0;
363 grp->outstanding_xid7 = 0;
364 grp->outstanding_xid7_p2 = 0;
365 grp->saved_xid2 = NULL;
366 if (callback)
367 ctcm_open(dev);
368 fsm_event(priv->fsm, DEV_EVENT_START, dev);
369 break;
370 case MPCG_STATE_READY:
371 /* XID exchanges completed after PORT was activated */
372 /* Link station already active */
373 /* Maybe timing issue...retry callback */
374 grp->allocchan_callback_retries++;
375 if (grp->allocchan_callback_retries < 4) {
376 if (grp->allochanfunc)
377 grp->allochanfunc(grp->port_num,
378 grp->group_max_buflen);
379 } else {
380 /* there are problems...bail out */
381 /* there may be a state mismatch so restart */
382 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
383 grp->allocchan_callback_retries = 0;
384 }
385 break;
386 }
387
388 return 0;
389 }
390 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
391
392 /*
393 * ctc_mpc_establish_connectivity
394 * (exported interface)
395 */
396 void ctc_mpc_establish_connectivity(int port_num,
397 void (*callback)(int, int, int))
398 {
399 struct net_device *dev;
400 struct mpc_group *grp;
401 struct ctcm_priv *priv;
402 struct channel *rch, *wch;
403
404 dev = ctcmpc_get_dev(port_num);
405 if (dev == NULL)
406 return;
407 priv = dev->ml_priv;
408 grp = priv->mpcg;
409 rch = priv->channel[CTCM_READ];
410 wch = priv->channel[CTCM_WRITE];
411
412 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
413 "%s(%s): state=%s",
414 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
415
416 grp->estconnfunc = callback;
417 grp->port_num = port_num;
418
419 switch (fsm_getstate(grp->fsm)) {
420 case MPCG_STATE_READY:
421 /* XID exchanges completed after PORT was activated */
422 /* Link station already active */
423 /* Maybe timing issue...retry callback */
424 fsm_deltimer(&grp->timer);
425 grp->estconn_callback_retries++;
426 if (grp->estconn_callback_retries < 4) {
427 if (grp->estconnfunc) {
428 grp->estconnfunc(grp->port_num, 0,
429 grp->group_max_buflen);
430 grp->estconnfunc = NULL;
431 }
432 } else {
433 /* there are problems...bail out */
434 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
435 grp->estconn_callback_retries = 0;
436 }
437 break;
438 case MPCG_STATE_INOP:
439 case MPCG_STATE_RESET:
440 /* MPC Group is not ready to start XID - min num of */
441 /* 1 read and 1 write channel have not been acquired*/
442
443 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
444 "%s(%s): REJECTED - inactive channels",
445 CTCM_FUNTAIL, dev->name);
446 if (grp->estconnfunc) {
447 grp->estconnfunc(grp->port_num, -1, 0);
448 grp->estconnfunc = NULL;
449 }
450 break;
451 case MPCG_STATE_XID2INITW:
452 /* alloc channel was called but no XID exchange */
453 /* has occurred. initiate xside XID exchange */
454 /* make sure yside XID0 processing has not started */
455
456 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
457 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
458 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
459 "%s(%s): ABORT - PASSIVE XID",
460 CTCM_FUNTAIL, dev->name);
461 break;
462 }
463 grp->send_qllc_disc = 1;
464 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
465 fsm_deltimer(&grp->timer);
466 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
467 MPCG_EVENT_TIMER, dev);
468 grp->outstanding_xid7 = 0;
469 grp->outstanding_xid7_p2 = 0;
470 grp->saved_xid2 = NULL;
471 if ((rch->in_mpcgroup) &&
472 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
473 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
474 else {
475 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
476 "%s(%s): RX-%s not ready for ACTIVE XID0",
477 CTCM_FUNTAIL, dev->name, rch->id);
478 if (grp->estconnfunc) {
479 grp->estconnfunc(grp->port_num, -1, 0);
480 grp->estconnfunc = NULL;
481 }
482 fsm_deltimer(&grp->timer);
483 goto done;
484 }
485 if ((wch->in_mpcgroup) &&
486 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
487 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
488 else {
489 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
490 "%s(%s): WX-%s not ready for ACTIVE XID0",
491 CTCM_FUNTAIL, dev->name, wch->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 break;
500 case MPCG_STATE_XID0IOWAIT:
501 /* already in active XID negotiations */
502 default:
503 break;
504 }
505
506 done:
507 CTCM_PR_DEBUG("Exit %s()\n", __func__);
508 return;
509 }
510 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
511
512 /*
513 * ctc_mpc_dealloc_ch
514 * (exported interface)
515 */
516 void ctc_mpc_dealloc_ch(int port_num)
517 {
518 struct net_device *dev;
519 struct ctcm_priv *priv;
520 struct mpc_group *grp;
521
522 dev = ctcmpc_get_dev(port_num);
523 if (dev == NULL)
524 return;
525 priv = dev->ml_priv;
526 grp = priv->mpcg;
527
528 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
529 "%s: %s: refcount = %d\n",
530 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
531
532 fsm_deltimer(&priv->restart_timer);
533 grp->channels_terminating = 0;
534 fsm_deltimer(&grp->timer);
535 grp->allochanfunc = NULL;
536 grp->estconnfunc = NULL;
537 grp->port_persist = 0;
538 grp->send_qllc_disc = 0;
539 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
540
541 ctcm_close(dev);
542 return;
543 }
544 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
545
546 /*
547 * ctc_mpc_flow_control
548 * (exported interface)
549 */
550 void ctc_mpc_flow_control(int port_num, int flowc)
551 {
552 struct ctcm_priv *priv;
553 struct mpc_group *grp;
554 struct net_device *dev;
555 struct channel *rch;
556 int mpcg_state;
557
558 dev = ctcmpc_get_dev(port_num);
559 if (dev == NULL)
560 return;
561 priv = dev->ml_priv;
562 grp = priv->mpcg;
563
564 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
565 "%s: %s: flowc = %d",
566 CTCM_FUNTAIL, dev->name, flowc);
567
568 rch = priv->channel[CTCM_READ];
569
570 mpcg_state = fsm_getstate(grp->fsm);
571 switch (flowc) {
572 case 1:
573 if (mpcg_state == MPCG_STATE_FLOWC)
574 break;
575 if (mpcg_state == MPCG_STATE_READY) {
576 if (grp->flow_off_called == 1)
577 grp->flow_off_called = 0;
578 else
579 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
580 break;
581 }
582 break;
583 case 0:
584 if (mpcg_state == MPCG_STATE_FLOWC) {
585 fsm_newstate(grp->fsm, MPCG_STATE_READY);
586 /* ensure any data that has accumulated */
587 /* on the io_queue will now be sen t */
588 tasklet_schedule(&rch->ch_tasklet);
589 }
590 /* possible race condition */
591 if (mpcg_state == MPCG_STATE_READY) {
592 grp->flow_off_called = 1;
593 break;
594 }
595 break;
596 }
597
598 }
599 EXPORT_SYMBOL(ctc_mpc_flow_control);
600
601 static int mpc_send_qllc_discontact(struct net_device *);
602
603 /*
604 * helper function of ctcmpc_unpack_skb
605 */
606 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
607 {
608 struct channel *rch = mpcginfo->ch;
609 struct net_device *dev = rch->netdev;
610 struct ctcm_priv *priv = dev->ml_priv;
611 struct mpc_group *grp = priv->mpcg;
612 struct channel *ch = priv->channel[CTCM_WRITE];
613
614 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
615 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
616
617 grp->sweep_rsp_pend_num--;
618
619 if ((grp->sweep_req_pend_num == 0) &&
620 (grp->sweep_rsp_pend_num == 0)) {
621 fsm_deltimer(&ch->sweep_timer);
622 grp->in_sweep = 0;
623 rch->th_seq_num = 0x00;
624 ch->th_seq_num = 0x00;
625 ctcm_clear_busy_do(dev);
626 }
627
628 kfree(mpcginfo);
629
630 return;
631
632 }
633
634 /*
635 * helper function of mpc_rcvd_sweep_req
636 * which is a helper of ctcmpc_unpack_skb
637 */
638 static void ctcmpc_send_sweep_resp(struct channel *rch)
639 {
640 struct net_device *dev = rch->netdev;
641 struct ctcm_priv *priv = dev->ml_priv;
642 struct mpc_group *grp = priv->mpcg;
643 struct th_sweep *header;
644 struct sk_buff *sweep_skb;
645 struct channel *ch = priv->channel[CTCM_WRITE];
646
647 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
648
649 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
650 if (sweep_skb == NULL) {
651 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
652 "%s(%s): sweep_skb allocation ERROR\n",
653 CTCM_FUNTAIL, rch->id);
654 goto done;
655 }
656
657 header = kmalloc(sizeof(struct th_sweep), gfp_type());
658
659 if (!header) {
660 dev_kfree_skb_any(sweep_skb);
661 goto done;
662 }
663
664 header->th.th_seg = 0x00 ;
665 header->th.th_ch_flag = TH_SWEEP_RESP;
666 header->th.th_blk_flag = 0x00;
667 header->th.th_is_xid = 0x00;
668 header->th.th_seq_num = 0x00;
669 header->sw.th_last_seq = ch->th_seq_num;
670
671 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
672
673 kfree(header);
674
675 netif_trans_update(dev);
676 skb_queue_tail(&ch->sweep_queue, sweep_skb);
677
678 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
679
680 return;
681
682 done:
683 grp->in_sweep = 0;
684 ctcm_clear_busy_do(dev);
685 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
686
687 return;
688 }
689
690 /*
691 * helper function of ctcmpc_unpack_skb
692 */
693 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
694 {
695 struct channel *rch = mpcginfo->ch;
696 struct net_device *dev = rch->netdev;
697 struct ctcm_priv *priv = dev->ml_priv;
698 struct mpc_group *grp = priv->mpcg;
699 struct channel *ch = priv->channel[CTCM_WRITE];
700
701 if (do_debug)
702 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
703 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
704
705 if (grp->in_sweep == 0) {
706 grp->in_sweep = 1;
707 ctcm_test_and_set_busy(dev);
708 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
709 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
710 }
711
712 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
713
714 grp->sweep_req_pend_num--;
715 ctcmpc_send_sweep_resp(ch);
716 kfree(mpcginfo);
717 return;
718 }
719
720 /*
721 * MPC Group Station FSM definitions
722 */
723 static const char *mpcg_event_names[] = {
724 [MPCG_EVENT_INOP] = "INOP Condition",
725 [MPCG_EVENT_DISCONC] = "Discontact Received",
726 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
727 [MPCG_EVENT_XID2] = "XID2 Received",
728 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
729 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
730 [MPCG_EVENT_TIMER] = "XID Setup Timer",
731 [MPCG_EVENT_DOIO] = "XID DoIO",
732 };
733
734 static const char *mpcg_state_names[] = {
735 [MPCG_STATE_RESET] = "Reset",
736 [MPCG_STATE_INOP] = "INOP",
737 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
738 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
739 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
740 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
741 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
742 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
743 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
744 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
745 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
746 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
747 [MPCG_STATE_READY] = "READY",
748 };
749
750 /*
751 * The MPC Group Station FSM
752 * 22 events
753 */
754 static const fsm_node mpcg_fsm[] = {
755 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
756 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
757 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
758
759 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
760 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
761
762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
763 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
764 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
765 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
766 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
767
768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
769 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
770 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
771 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
772 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
773
774 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
775 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
776 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
777 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
778 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
779 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
780 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
781
782 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
783 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
784 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
785 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
786 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
787 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
788
789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
794 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
795
796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
801 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
802
803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
804 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
805 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
806 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
807 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
808 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
809 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
810
811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
816 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
817
818 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
819 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
820 };
821
822 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
823
824 /*
825 * MPC Group Station FSM action
826 * CTCM_PROTO_MPC only
827 */
828 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
829 {
830 struct net_device *dev = arg;
831 struct ctcm_priv *priv = dev->ml_priv;
832 struct mpc_group *grp = priv->mpcg;
833
834 if (grp == NULL) {
835 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
836 "%s(%s): No MPC group",
837 CTCM_FUNTAIL, dev->name);
838 return;
839 }
840
841 fsm_deltimer(&grp->timer);
842
843 if (grp->saved_xid2->xid2_flag2 == 0x40) {
844 priv->xid->xid2_flag2 = 0x00;
845 if (grp->estconnfunc) {
846 grp->estconnfunc(grp->port_num, 1,
847 grp->group_max_buflen);
848 grp->estconnfunc = NULL;
849 } else if (grp->allochanfunc)
850 grp->send_qllc_disc = 1;
851
852 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
854 "%s(%s): fails",
855 CTCM_FUNTAIL, dev->name);
856 return;
857 }
858
859 grp->port_persist = 1;
860 grp->out_of_sequence = 0;
861 grp->estconn_called = 0;
862
863 tasklet_hi_schedule(&grp->mpc_tasklet2);
864
865 return;
866 }
867
868 /*
869 * helper of ctcm_init_netdevice
870 * CTCM_PROTO_MPC only
871 */
872 void mpc_group_ready(unsigned long adev)
873 {
874 struct net_device *dev = (struct net_device *)adev;
875 struct ctcm_priv *priv = dev->ml_priv;
876 struct mpc_group *grp = priv->mpcg;
877 struct channel *ch = NULL;
878
879 if (grp == NULL) {
880 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
881 "%s(%s): No MPC group",
882 CTCM_FUNTAIL, dev->name);
883 return;
884 }
885
886 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
887 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
888 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
889
890 fsm_newstate(grp->fsm, MPCG_STATE_READY);
891
892 /* Put up a read on the channel */
893 ch = priv->channel[CTCM_READ];
894 ch->pdu_seq = 0;
895 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
896 __func__, ch->pdu_seq);
897
898 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
899 /* Put the write channel in idle state */
900 ch = priv->channel[CTCM_WRITE];
901 if (ch->collect_len > 0) {
902 spin_lock(&ch->collect_lock);
903 ctcm_purge_skb_queue(&ch->collect_queue);
904 ch->collect_len = 0;
905 spin_unlock(&ch->collect_lock);
906 }
907 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
908 ctcm_clear_busy(dev);
909
910 if (grp->estconnfunc) {
911 grp->estconnfunc(grp->port_num, 0,
912 grp->group_max_buflen);
913 grp->estconnfunc = NULL;
914 } else if (grp->allochanfunc)
915 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
916
917 grp->send_qllc_disc = 1;
918 grp->changed_side = 0;
919
920 return;
921
922 }
923
924 /*
925 * Increment the MPC Group Active Channel Counts
926 * helper of dev_action (called from channel fsm)
927 */
928 void mpc_channel_action(struct channel *ch, int direction, int action)
929 {
930 struct net_device *dev = ch->netdev;
931 struct ctcm_priv *priv = dev->ml_priv;
932 struct mpc_group *grp = priv->mpcg;
933
934 if (grp == NULL) {
935 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
936 "%s(%s): No MPC group",
937 CTCM_FUNTAIL, dev->name);
938 return;
939 }
940
941 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
942
943 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
944 "%s: %i / Grp:%s total_channels=%i, active_channels: "
945 "read=%i, write=%i\n", __func__, action,
946 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
947 grp->active_channels[CTCM_READ],
948 grp->active_channels[CTCM_WRITE]);
949
950 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
951 grp->num_channel_paths++;
952 grp->active_channels[direction]++;
953 grp->outstanding_xid2++;
954 ch->in_mpcgroup = 1;
955
956 if (ch->xid_skb != NULL)
957 dev_kfree_skb_any(ch->xid_skb);
958
959 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
960 GFP_ATOMIC | GFP_DMA);
961 if (ch->xid_skb == NULL) {
962 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
963 "%s(%s): Couldn't alloc ch xid_skb\n",
964 CTCM_FUNTAIL, dev->name);
965 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
966 return;
967 }
968 ch->xid_skb_data = ch->xid_skb->data;
969 ch->xid_th = (struct th_header *)ch->xid_skb->data;
970 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
971 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
972 skb_put(ch->xid_skb, XID2_LENGTH);
973 ch->xid_id = skb_tail_pointer(ch->xid_skb);
974 ch->xid_skb->data = ch->xid_skb_data;
975 skb_reset_tail_pointer(ch->xid_skb);
976 ch->xid_skb->len = 0;
977
978 skb_put_data(ch->xid_skb, grp->xid_skb->data,
979 grp->xid_skb->len);
980
981 ch->xid->xid2_dlc_type =
982 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
983 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
984
985 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
986 ch->xid->xid2_buf_len = 0x00;
987
988 ch->xid_skb->data = ch->xid_skb_data;
989 skb_reset_tail_pointer(ch->xid_skb);
990 ch->xid_skb->len = 0;
991
992 fsm_newstate(ch->fsm, CH_XID0_PENDING);
993
994 if ((grp->active_channels[CTCM_READ] > 0) &&
995 (grp->active_channels[CTCM_WRITE] > 0) &&
996 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
997 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
998 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
999 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1000 __func__, dev->name);
1001 }
1002 } else if ((action == MPC_CHANNEL_REMOVE) &&
1003 (ch->in_mpcgroup == 1)) {
1004 ch->in_mpcgroup = 0;
1005 grp->num_channel_paths--;
1006 grp->active_channels[direction]--;
1007
1008 if (ch->xid_skb != NULL)
1009 dev_kfree_skb_any(ch->xid_skb);
1010 ch->xid_skb = NULL;
1011
1012 if (grp->channels_terminating)
1013 goto done;
1014
1015 if (((grp->active_channels[CTCM_READ] == 0) &&
1016 (grp->active_channels[CTCM_WRITE] > 0))
1017 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1018 (grp->active_channels[CTCM_READ] > 0)))
1019 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1020 }
1021 done:
1022 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1023 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1024 "read=%i, write=%i\n", __func__, action,
1025 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1026 grp->active_channels[CTCM_READ],
1027 grp->active_channels[CTCM_WRITE]);
1028
1029 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1030 }
1031
1032 /**
1033 * Unpack a just received skb and hand it over to
1034 * upper layers.
1035 * special MPC version of unpack_skb.
1036 *
1037 * ch The channel where this skb has been received.
1038 * pskb The received skb.
1039 */
1040 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1041 {
1042 struct net_device *dev = ch->netdev;
1043 struct ctcm_priv *priv = dev->ml_priv;
1044 struct mpc_group *grp = priv->mpcg;
1045 struct pdu *curr_pdu;
1046 struct mpcg_info *mpcginfo;
1047 struct th_header *header = NULL;
1048 struct th_sweep *sweep = NULL;
1049 int pdu_last_seen = 0;
1050 __u32 new_len;
1051 struct sk_buff *skb;
1052 int skblen;
1053 int sendrc = 0;
1054
1055 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1056 __func__, dev->name, smp_processor_id(), ch->id);
1057
1058 header = (struct th_header *)pskb->data;
1059 if ((header->th_seg == 0) &&
1060 (header->th_ch_flag == 0) &&
1061 (header->th_blk_flag == 0) &&
1062 (header->th_seq_num == 0))
1063 /* nothing for us */ goto done;
1064
1065 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1066 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1067 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1068
1069 pskb->dev = dev;
1070 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1071 skb_pull(pskb, TH_HEADER_LENGTH);
1072
1073 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1074 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1075 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1076 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1077 (header->th_seq_num != ch->th_seq_num + 1) &&
1078 (ch->th_seq_num != 0))) {
1079 /* This is NOT the next segment *
1080 * we are not the correct race winner *
1081 * go away and let someone else win *
1082 * BUT..this only applies if xid negot *
1083 * is done *
1084 */
1085 grp->out_of_sequence += 1;
1086 __skb_push(pskb, TH_HEADER_LENGTH);
1087 skb_queue_tail(&ch->io_queue, pskb);
1088 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1089 "got:%08x\n", __func__,
1090 ch->th_seq_num + 1, header->th_seq_num);
1091
1092 return;
1093 }
1094 grp->out_of_sequence = 0;
1095 ch->th_seq_num = header->th_seq_num;
1096
1097 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1098 __func__, ch->th_seq_num);
1099
1100 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1101 goto done;
1102 while ((pskb->len > 0) && !pdu_last_seen) {
1103 curr_pdu = (struct pdu *)pskb->data;
1104
1105 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1106 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1107 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1108 __func__, pskb->len);
1109
1110 skb_pull(pskb, PDU_HEADER_LENGTH);
1111
1112 if (curr_pdu->pdu_flag & PDU_LAST)
1113 pdu_last_seen = 1;
1114 if (curr_pdu->pdu_flag & PDU_CNTL)
1115 pskb->protocol = htons(ETH_P_SNAP);
1116 else
1117 pskb->protocol = htons(ETH_P_SNA_DIX);
1118
1119 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1120 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1121 "%s(%s): Dropping packet with "
1122 "illegal siize %d",
1123 CTCM_FUNTAIL, dev->name, pskb->len);
1124
1125 priv->stats.rx_dropped++;
1126 priv->stats.rx_length_errors++;
1127 goto done;
1128 }
1129 skb_reset_mac_header(pskb);
1130 new_len = curr_pdu->pdu_offset;
1131 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1132 __func__, new_len);
1133 if ((new_len == 0) || (new_len > pskb->len)) {
1134 /* should never happen */
1135 /* pskb len must be hosed...bail out */
1136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137 "%s(%s): non valid pdu_offset: %04x",
1138 /* "data may be lost", */
1139 CTCM_FUNTAIL, dev->name, new_len);
1140 goto done;
1141 }
1142 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1143
1144 if (!skb) {
1145 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1146 "%s(%s): MEMORY allocation error",
1147 CTCM_FUNTAIL, dev->name);
1148 priv->stats.rx_dropped++;
1149 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1150 goto done;
1151 }
1152 skb_put_data(skb, pskb->data, new_len);
1153
1154 skb_reset_mac_header(skb);
1155 skb->dev = pskb->dev;
1156 skb->protocol = pskb->protocol;
1157 skb->ip_summed = CHECKSUM_UNNECESSARY;
1158 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1159 ch->pdu_seq++;
1160
1161 if (do_debug_data) {
1162 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1163 __func__, ch->pdu_seq);
1164 ctcm_pr_debug("%s: skb:%0lx "
1165 "skb len: %d \n", __func__,
1166 (unsigned long)skb, skb->len);
1167 ctcm_pr_debug("%s: up to 32 bytes "
1168 "of pdu_data sent\n", __func__);
1169 ctcmpc_dump32((char *)skb->data, skb->len);
1170 }
1171
1172 skblen = skb->len;
1173 sendrc = netif_rx(skb);
1174 priv->stats.rx_packets++;
1175 priv->stats.rx_bytes += skblen;
1176 skb_pull(pskb, new_len); /* point to next PDU */
1177 }
1178 } else {
1179 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1180 if (mpcginfo == NULL)
1181 goto done;
1182
1183 mpcginfo->ch = ch;
1184 mpcginfo->th = header;
1185 mpcginfo->skb = pskb;
1186 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1187 __func__);
1188 /* it's a sweep? */
1189 sweep = (struct th_sweep *)pskb->data;
1190 mpcginfo->sweep = sweep;
1191 if (header->th_ch_flag == TH_SWEEP_REQ)
1192 mpc_rcvd_sweep_req(mpcginfo);
1193 else if (header->th_ch_flag == TH_SWEEP_RESP)
1194 mpc_rcvd_sweep_resp(mpcginfo);
1195 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1196 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1197 skb_pull(pskb, XID2_LENGTH);
1198 mpcginfo->xid = thisxid;
1199 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1200 } else if (header->th_blk_flag == TH_DISCONTACT)
1201 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1202 else if (header->th_seq_num != 0) {
1203 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1204 "%s(%s): control pkt expected\n",
1205 CTCM_FUNTAIL, dev->name);
1206 priv->stats.rx_dropped++;
1207 /* mpcginfo only used for non-data transfers */
1208 kfree(mpcginfo);
1209 if (do_debug_data)
1210 ctcmpc_dump_skb(pskb, -8);
1211 }
1212 }
1213 done:
1214
1215 dev_kfree_skb_any(pskb);
1216 if (sendrc == NET_RX_DROP) {
1217 dev_warn(&dev->dev,
1218 "The network backlog for %s is exceeded, "
1219 "package dropped\n", __func__);
1220 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1221 }
1222
1223 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1224 __func__, dev->name, ch, ch->id);
1225 }
1226
1227 /**
1228 * tasklet helper for mpc's skb unpacking.
1229 *
1230 * ch The channel to work on.
1231 * Allow flow control back pressure to occur here.
1232 * Throttling back channel can result in excessive
1233 * channel inactivity and system deact of channel
1234 */
1235 void ctcmpc_bh(unsigned long thischan)
1236 {
1237 struct channel *ch = (struct channel *)thischan;
1238 struct sk_buff *skb;
1239 struct net_device *dev = ch->netdev;
1240 struct ctcm_priv *priv = dev->ml_priv;
1241 struct mpc_group *grp = priv->mpcg;
1242
1243 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1244 dev->name, smp_processor_id(), __func__, ch->id);
1245 /* caller has requested driver to throttle back */
1246 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1247 (skb = skb_dequeue(&ch->io_queue))) {
1248 ctcmpc_unpack_skb(ch, skb);
1249 if (grp->out_of_sequence > 20) {
1250 /* assume data loss has occurred if */
1251 /* missing seq_num for extended */
1252 /* period of time */
1253 grp->out_of_sequence = 0;
1254 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1255 break;
1256 }
1257 if (skb == skb_peek(&ch->io_queue))
1258 break;
1259 }
1260 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1261 __func__, dev->name, ch, ch->id);
1262 return;
1263 }
1264
1265 /*
1266 * MPC Group Initializations
1267 */
1268 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1269 {
1270 struct mpc_group *grp;
1271
1272 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1273 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1274
1275 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1276 if (grp == NULL)
1277 return NULL;
1278
1279 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1280 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1281 mpcg_fsm_len, GFP_KERNEL);
1282 if (grp->fsm == NULL) {
1283 kfree(grp);
1284 return NULL;
1285 }
1286
1287 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1288 fsm_settimer(grp->fsm, &grp->timer);
1289
1290 grp->xid_skb =
1291 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1292 if (grp->xid_skb == NULL) {
1293 kfree_fsm(grp->fsm);
1294 kfree(grp);
1295 return NULL;
1296 }
1297 /* base xid for all channels in group */
1298 grp->xid_skb_data = grp->xid_skb->data;
1299 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1300 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1301
1302 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1303 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1304 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1305 grp->xid->xid2_sender_id = jiffies;
1306
1307 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1308 skb_put_data(grp->xid_skb, "VTAM", 4);
1309
1310 grp->rcvd_xid_skb =
1311 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1312 if (grp->rcvd_xid_skb == NULL) {
1313 kfree_fsm(grp->fsm);
1314 dev_kfree_skb(grp->xid_skb);
1315 kfree(grp);
1316 return NULL;
1317 }
1318 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1319 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1320 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1321 grp->saved_xid2 = NULL;
1322 priv->xid = grp->xid;
1323 priv->mpcg = grp;
1324 return grp;
1325 }
1326
1327 /*
1328 * The MPC Group Station FSM
1329 */
1330
1331 /*
1332 * MPC Group Station FSM actions
1333 * CTCM_PROTO_MPC only
1334 */
1335
1336 /**
1337 * NOP action for statemachines
1338 */
1339 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1340 {
1341 }
1342
1343 /*
1344 * invoked when the device transitions to dev_stopped
1345 * MPC will stop each individual channel if a single XID failure
1346 * occurs, or will intitiate all channels be stopped if a GROUP
1347 * level failure occurs.
1348 */
1349 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1350 {
1351 struct net_device *dev = arg;
1352 struct ctcm_priv *priv;
1353 struct mpc_group *grp;
1354 struct channel *wch;
1355
1356 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1357
1358 priv = dev->ml_priv;
1359 grp = priv->mpcg;
1360 grp->flow_off_called = 0;
1361 fsm_deltimer(&grp->timer);
1362 if (grp->channels_terminating)
1363 return;
1364
1365 grp->channels_terminating = 1;
1366 grp->saved_state = fsm_getstate(grp->fsm);
1367 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1368 if (grp->saved_state > MPCG_STATE_XID7INITF)
1369 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1370 "%s(%s): MPC GROUP INOPERATIVE",
1371 CTCM_FUNTAIL, dev->name);
1372 if ((grp->saved_state != MPCG_STATE_RESET) ||
1373 /* dealloc_channel has been called */
1374 (grp->port_persist == 0))
1375 fsm_deltimer(&priv->restart_timer);
1376
1377 wch = priv->channel[CTCM_WRITE];
1378
1379 switch (grp->saved_state) {
1380 case MPCG_STATE_RESET:
1381 case MPCG_STATE_INOP:
1382 case MPCG_STATE_XID2INITW:
1383 case MPCG_STATE_XID0IOWAIT:
1384 case MPCG_STATE_XID2INITX:
1385 case MPCG_STATE_XID7INITW:
1386 case MPCG_STATE_XID7INITX:
1387 case MPCG_STATE_XID0IOWAIX:
1388 case MPCG_STATE_XID7INITI:
1389 case MPCG_STATE_XID7INITZ:
1390 case MPCG_STATE_XID7INITF:
1391 break;
1392 case MPCG_STATE_FLOWC:
1393 case MPCG_STATE_READY:
1394 default:
1395 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1396 }
1397
1398 grp->xid2_tgnum = 0;
1399 grp->group_max_buflen = 0; /*min of all received */
1400 grp->outstanding_xid2 = 0;
1401 grp->outstanding_xid7 = 0;
1402 grp->outstanding_xid7_p2 = 0;
1403 grp->saved_xid2 = NULL;
1404 grp->xidnogood = 0;
1405 grp->changed_side = 0;
1406
1407 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1408 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1409 grp->rcvd_xid_skb->len = 0;
1410 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1411 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1412
1413 if (grp->send_qllc_disc == 1) {
1414 grp->send_qllc_disc = 0;
1415 mpc_send_qllc_discontact(dev);
1416 }
1417
1418 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1419 /* This can result in INOP of VTAM PU due to halting of */
1420 /* outstanding IO which causes a sense to be returned */
1421 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1422 /* become unreachable without manual intervention */
1423 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1424 grp->alloc_called = 0;
1425 fsm_deltimer(&priv->restart_timer);
1426 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1427 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1428 if (grp->saved_state > MPCG_STATE_XID7INITF)
1429 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1430 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1431 CTCM_FUNTAIL, dev->name);
1432 } else {
1433 fsm_deltimer(&priv->restart_timer);
1434 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1435 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1436 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1437 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1438 CTCM_FUNTAIL, dev->name);
1439 }
1440 }
1441
1442 /**
1443 * Handle mpc group action timeout.
1444 * MPC Group Station FSM action
1445 * CTCM_PROTO_MPC only
1446 *
1447 * fi An instance of an mpc_group fsm.
1448 * event The event, just happened.
1449 * arg Generic pointer, casted from net_device * upon call.
1450 */
1451 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1452 {
1453 struct net_device *dev = arg;
1454 struct ctcm_priv *priv;
1455 struct mpc_group *grp;
1456 struct channel *wch;
1457 struct channel *rch;
1458
1459 priv = dev->ml_priv;
1460 grp = priv->mpcg;
1461 wch = priv->channel[CTCM_WRITE];
1462 rch = priv->channel[CTCM_READ];
1463
1464 switch (fsm_getstate(grp->fsm)) {
1465 case MPCG_STATE_XID2INITW:
1466 /* Unless there is outstanding IO on the */
1467 /* channel just return and wait for ATTN */
1468 /* interrupt to begin XID negotiations */
1469 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1470 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1471 break;
1472 default:
1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1474 }
1475
1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1477 "%s: dev=%s exit",
1478 CTCM_FUNTAIL, dev->name);
1479 return;
1480 }
1481
1482 /*
1483 * MPC Group Station FSM action
1484 * CTCM_PROTO_MPC only
1485 */
1486 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1487 {
1488 struct mpcg_info *mpcginfo = arg;
1489 struct channel *ch = mpcginfo->ch;
1490 struct net_device *dev;
1491 struct ctcm_priv *priv;
1492 struct mpc_group *grp;
1493
1494 if (ch) {
1495 dev = ch->netdev;
1496 if (dev) {
1497 priv = dev->ml_priv;
1498 if (priv) {
1499 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1500 "%s: %s: %s\n",
1501 CTCM_FUNTAIL, dev->name, ch->id);
1502 grp = priv->mpcg;
1503 grp->send_qllc_disc = 1;
1504 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1505 }
1506 }
1507 }
1508
1509 return;
1510 }
1511
1512 /*
1513 * MPC Group Station - not part of FSM
1514 * CTCM_PROTO_MPC only
1515 * called from add_channel in ctcm_main.c
1516 */
1517 void mpc_action_send_discontact(unsigned long thischan)
1518 {
1519 int rc;
1520 struct channel *ch = (struct channel *)thischan;
1521 unsigned long saveflags = 0;
1522
1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1525 (unsigned long)ch, 0xff, 0);
1526 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1527
1528 if (rc != 0) {
1529 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1530 }
1531
1532 return;
1533 }
1534
1535
1536 /*
1537 * helper function of mpc FSM
1538 * CTCM_PROTO_MPC only
1539 * mpc_action_rcvd_xid7
1540 */
1541 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1542 {
1543 struct channel *ch = mpcginfo->ch;
1544 struct net_device *dev = ch->netdev;
1545 struct ctcm_priv *priv = dev->ml_priv;
1546 struct mpc_group *grp = priv->mpcg;
1547 struct xid2 *xid = mpcginfo->xid;
1548 int rc = 0;
1549 __u64 our_id = 0;
1550 __u64 their_id = 0;
1551 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1552
1553 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1554
1555 if (xid == NULL) {
1556 rc = 1;
1557 /* XID REJECTED: xid == NULL */
1558 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1559 "%s(%s): xid = NULL",
1560 CTCM_FUNTAIL, ch->id);
1561 goto done;
1562 }
1563
1564 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1565
1566 /*the received direction should be the opposite of ours */
1567 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1568 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1569 rc = 2;
1570 /* XID REJECTED: r/w channel pairing mismatch */
1571 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1572 "%s(%s): r/w channel pairing mismatch",
1573 CTCM_FUNTAIL, ch->id);
1574 goto done;
1575 }
1576
1577 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1578 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1579 grp->group_max_buflen, xid->xid2_buf_len);
1580
1581 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1582 xid->xid2_buf_len - len)
1583 grp->group_max_buflen = xid->xid2_buf_len - len;
1584 }
1585
1586 if (grp->saved_xid2 == NULL) {
1587 grp->saved_xid2 =
1588 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1589
1590 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1591 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1592
1593 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1594 grp->rcvd_xid_skb->len = 0;
1595
1596 /* convert two 32 bit numbers into 1 64 bit for id compare */
1597 our_id = (__u64)priv->xid->xid2_adj_id;
1598 our_id = our_id << 32;
1599 our_id = our_id + priv->xid->xid2_sender_id;
1600 their_id = (__u64)xid->xid2_adj_id;
1601 their_id = their_id << 32;
1602 their_id = their_id + xid->xid2_sender_id;
1603 /* lower id assume the xside role */
1604 if (our_id < their_id) {
1605 grp->roll = XSIDE;
1606 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1607 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1608 CTCM_FUNTAIL, ch->id);
1609 } else {
1610 grp->roll = YSIDE;
1611 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1612 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1613 CTCM_FUNTAIL, ch->id);
1614 }
1615
1616 } else {
1617 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1618 rc = 3;
1619 /* XID REJECTED: xid flag byte4 mismatch */
1620 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1621 "%s(%s): xid flag byte4 mismatch",
1622 CTCM_FUNTAIL, ch->id);
1623 }
1624 if (xid->xid2_flag2 == 0x40) {
1625 rc = 4;
1626 /* XID REJECTED - xid NOGOOD */
1627 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1628 "%s(%s): xid NOGOOD",
1629 CTCM_FUNTAIL, ch->id);
1630 }
1631 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1632 rc = 5;
1633 /* XID REJECTED - Adjacent Station ID Mismatch */
1634 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1635 "%s(%s): Adjacent Station ID Mismatch",
1636 CTCM_FUNTAIL, ch->id);
1637 }
1638 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1639 rc = 6;
1640 /* XID REJECTED - Sender Address Mismatch */
1641 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1642 "%s(%s): Sender Address Mismatch",
1643 CTCM_FUNTAIL, ch->id);
1644 }
1645 }
1646 done:
1647 if (rc) {
1648 dev_warn(&dev->dev,
1649 "The XID used in the MPC protocol is not valid, "
1650 "rc = %d\n", rc);
1651 priv->xid->xid2_flag2 = 0x40;
1652 grp->saved_xid2->xid2_flag2 = 0x40;
1653 }
1654
1655 return rc;
1656 }
1657
1658 /*
1659 * MPC Group Station FSM action
1660 * CTCM_PROTO_MPC only
1661 */
1662 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1663 {
1664 struct channel *ch = arg;
1665 int rc = 0;
1666 int gotlock = 0;
1667 unsigned long saveflags = 0; /* avoids compiler warning with
1668 spin_unlock_irqrestore */
1669
1670 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1671 __func__, smp_processor_id(), ch, ch->id);
1672
1673 if (ctcm_checkalloc_buffer(ch))
1674 goto done;
1675
1676 /*
1677 * skb data-buffer referencing:
1678 */
1679 ch->trans_skb->data = ch->trans_skb_data;
1680 skb_reset_tail_pointer(ch->trans_skb);
1681 ch->trans_skb->len = 0;
1682 /* result of the previous 3 statements is NOT always
1683 * already set after ctcm_checkalloc_buffer
1684 * because of possible reuse of the trans_skb
1685 */
1686 memset(ch->trans_skb->data, 0, 16);
1687 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1688 /* check is main purpose here: */
1689 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1690 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1691 /* check is main purpose here: */
1692 skb_put(ch->trans_skb, XID2_LENGTH);
1693 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1694 /* cleanup back to startpoint */
1695 ch->trans_skb->data = ch->trans_skb_data;
1696 skb_reset_tail_pointer(ch->trans_skb);
1697 ch->trans_skb->len = 0;
1698
1699 /* non-checking rewrite of above skb data-buffer referencing: */
1700 /*
1701 memset(ch->trans_skb->data, 0, 16);
1702 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1703 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1704 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1705 */
1706
1707 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1708 ch->ccw[8].count = 0;
1709 ch->ccw[8].cda = 0x00;
1710
1711 if (!(ch->xid_th && ch->xid && ch->xid_id))
1712 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1713 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1714 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1715
1716 if (side == XSIDE) {
1717 /* mpc_action_xside_xid */
1718 if (ch->xid_th == NULL)
1719 goto done;
1720 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1721 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1722 ch->ccw[9].count = TH_HEADER_LENGTH;
1723 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1724
1725 if (ch->xid == NULL)
1726 goto done;
1727 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1728 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1729 ch->ccw[10].count = XID2_LENGTH;
1730 ch->ccw[10].cda = virt_to_phys(ch->xid);
1731
1732 ch->ccw[11].cmd_code = CCW_CMD_READ;
1733 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1734 ch->ccw[11].count = TH_HEADER_LENGTH;
1735 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1736
1737 ch->ccw[12].cmd_code = CCW_CMD_READ;
1738 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1739 ch->ccw[12].count = XID2_LENGTH;
1740 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1741
1742 ch->ccw[13].cmd_code = CCW_CMD_READ;
1743 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1744
1745 } else { /* side == YSIDE : mpc_action_yside_xid */
1746 ch->ccw[9].cmd_code = CCW_CMD_READ;
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->rcvd_xid_th);
1750
1751 ch->ccw[10].cmd_code = CCW_CMD_READ;
1752 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1753 ch->ccw[10].count = XID2_LENGTH;
1754 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1755
1756 if (ch->xid_th == NULL)
1757 goto done;
1758 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
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->xid_th);
1762
1763 if (ch->xid == NULL)
1764 goto done;
1765 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1766 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1767 ch->ccw[12].count = XID2_LENGTH;
1768 ch->ccw[12].cda = virt_to_phys(ch->xid);
1769
1770 if (ch->xid_id == NULL)
1771 goto done;
1772 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1773 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1774
1775 }
1776 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1777 ch->ccw[13].count = 4;
1778
1779 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1780 ch->ccw[14].flags = CCW_FLAG_SLI;
1781 ch->ccw[14].count = 0;
1782 ch->ccw[14].cda = 0;
1783
1784 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1785 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1786 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1787 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1788
1789 if (!in_irq()) {
1790 /* Such conditional locking is a known problem for
1791 * sparse because its static undeterministic.
1792 * Warnings should be ignored here. */
1793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1794 gotlock = 1;
1795 }
1796
1797 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1798 rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1799 (unsigned long)ch, 0xff, 0);
1800
1801 if (gotlock) /* see remark above about conditional locking */
1802 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1803
1804 if (rc != 0) {
1805 ctcm_ccw_check_rc(ch, rc,
1806 (side == XSIDE) ? "x-side XID" : "y-side XID");
1807 }
1808
1809 done:
1810 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1811 __func__, ch, ch->id);
1812 return;
1813
1814 }
1815
1816 /*
1817 * MPC Group Station FSM action
1818 * CTCM_PROTO_MPC only
1819 */
1820 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1821 {
1822 mpc_action_side_xid(fsm, arg, XSIDE);
1823 }
1824
1825 /*
1826 * MPC Group Station FSM action
1827 * CTCM_PROTO_MPC only
1828 */
1829 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1830 {
1831 mpc_action_side_xid(fsm, arg, YSIDE);
1832 }
1833
1834 /*
1835 * MPC Group Station FSM action
1836 * CTCM_PROTO_MPC only
1837 */
1838 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1839 {
1840 struct channel *ch = arg;
1841 struct net_device *dev = ch->netdev;
1842 struct ctcm_priv *priv = dev->ml_priv;
1843 struct mpc_group *grp = priv->mpcg;
1844
1845 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1846 __func__, smp_processor_id(), ch, ch->id);
1847
1848 if (ch->xid == NULL) {
1849 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1850 "%s(%s): ch->xid == NULL",
1851 CTCM_FUNTAIL, dev->name);
1852 return;
1853 }
1854
1855 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1856
1857 ch->xid->xid2_option = XID2_0;
1858
1859 switch (fsm_getstate(grp->fsm)) {
1860 case MPCG_STATE_XID2INITW:
1861 case MPCG_STATE_XID2INITX:
1862 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1863 break;
1864 case MPCG_STATE_XID0IOWAIT:
1865 case MPCG_STATE_XID0IOWAIX:
1866 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1867 break;
1868 }
1869
1870 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1871
1872 return;
1873 }
1874
1875 /*
1876 * MPC Group Station FSM action
1877 * CTCM_PROTO_MPC only
1878 */
1879 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1880 {
1881 struct net_device *dev = arg;
1882 struct ctcm_priv *priv = dev->ml_priv;
1883 struct mpc_group *grp = NULL;
1884 int direction;
1885 int send = 0;
1886
1887 if (priv)
1888 grp = priv->mpcg;
1889 if (grp == NULL)
1890 return;
1891
1892 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1893 struct channel *ch = priv->channel[direction];
1894 struct xid2 *thisxid = ch->xid;
1895 ch->xid_skb->data = ch->xid_skb_data;
1896 skb_reset_tail_pointer(ch->xid_skb);
1897 ch->xid_skb->len = 0;
1898 thisxid->xid2_option = XID2_7;
1899 send = 0;
1900
1901 /* xid7 phase 1 */
1902 if (grp->outstanding_xid7_p2 > 0) {
1903 if (grp->roll == YSIDE) {
1904 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1905 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1906 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1907 skb_put_data(ch->xid_skb, &thdummy,
1908 TH_HEADER_LENGTH);
1909 send = 1;
1910 }
1911 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1912 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1913 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1914 skb_put_data(ch->xid_skb, &thnorm,
1915 TH_HEADER_LENGTH);
1916 send = 1;
1917 }
1918 } else {
1919 /* xid7 phase 2 */
1920 if (grp->roll == YSIDE) {
1921 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1922 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1923 skb_put_data(ch->xid_skb, &thnorm,
1924 TH_HEADER_LENGTH);
1925 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1926 send = 1;
1927 }
1928 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1929 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1930 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1931 skb_put_data(ch->xid_skb, &thdummy,
1932 TH_HEADER_LENGTH);
1933 send = 1;
1934 }
1935 }
1936
1937 if (send)
1938 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1939 }
1940
1941 return;
1942 }
1943
1944 /*
1945 * MPC Group Station FSM action
1946 * CTCM_PROTO_MPC only
1947 */
1948 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1949 {
1950
1951 struct mpcg_info *mpcginfo = arg;
1952 struct channel *ch = mpcginfo->ch;
1953 struct net_device *dev = ch->netdev;
1954 struct ctcm_priv *priv = dev->ml_priv;
1955 struct mpc_group *grp = priv->mpcg;
1956
1957 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1958 __func__, ch->id, grp->outstanding_xid2,
1959 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1960
1961 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1962 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1963
1964 grp->outstanding_xid2--;
1965 grp->outstanding_xid7++;
1966 grp->outstanding_xid7_p2++;
1967
1968 /* must change state before validating xid to */
1969 /* properly handle interim interrupts received*/
1970 switch (fsm_getstate(grp->fsm)) {
1971 case MPCG_STATE_XID2INITW:
1972 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1973 mpc_validate_xid(mpcginfo);
1974 break;
1975 case MPCG_STATE_XID0IOWAIT:
1976 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1977 mpc_validate_xid(mpcginfo);
1978 break;
1979 case MPCG_STATE_XID2INITX:
1980 if (grp->outstanding_xid2 == 0) {
1981 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1982 mpc_validate_xid(mpcginfo);
1983 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1984 }
1985 break;
1986 case MPCG_STATE_XID0IOWAIX:
1987 if (grp->outstanding_xid2 == 0) {
1988 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1989 mpc_validate_xid(mpcginfo);
1990 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991 }
1992 break;
1993 }
1994 kfree(mpcginfo);
1995
1996 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1997 __func__, ch->id, grp->outstanding_xid2,
1998 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1999 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2000 __func__, ch->id,
2001 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2002 return;
2003
2004 }
2005
2006
2007 /*
2008 * MPC Group Station FSM action
2009 * CTCM_PROTO_MPC only
2010 */
2011 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2012 {
2013 struct mpcg_info *mpcginfo = arg;
2014 struct channel *ch = mpcginfo->ch;
2015 struct net_device *dev = ch->netdev;
2016 struct ctcm_priv *priv = dev->ml_priv;
2017 struct mpc_group *grp = priv->mpcg;
2018
2019 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2020 __func__, smp_processor_id(), ch, ch->id);
2021 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2022 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2023
2024 grp->outstanding_xid7--;
2025 ch->xid_skb->data = ch->xid_skb_data;
2026 skb_reset_tail_pointer(ch->xid_skb);
2027 ch->xid_skb->len = 0;
2028
2029 switch (fsm_getstate(grp->fsm)) {
2030 case MPCG_STATE_XID7INITI:
2031 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2032 mpc_validate_xid(mpcginfo);
2033 break;
2034 case MPCG_STATE_XID7INITW:
2035 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2036 mpc_validate_xid(mpcginfo);
2037 break;
2038 case MPCG_STATE_XID7INITZ:
2039 case MPCG_STATE_XID7INITX:
2040 if (grp->outstanding_xid7 == 0) {
2041 if (grp->outstanding_xid7_p2 > 0) {
2042 grp->outstanding_xid7 =
2043 grp->outstanding_xid7_p2;
2044 grp->outstanding_xid7_p2 = 0;
2045 } else
2046 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2047
2048 mpc_validate_xid(mpcginfo);
2049 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2050 break;
2051 }
2052 mpc_validate_xid(mpcginfo);
2053 break;
2054 }
2055 kfree(mpcginfo);
2056 return;
2057 }
2058
2059 /*
2060 * mpc_action helper of an MPC Group Station FSM action
2061 * CTCM_PROTO_MPC only
2062 */
2063 static int mpc_send_qllc_discontact(struct net_device *dev)
2064 {
2065 __u32 new_len = 0;
2066 struct sk_buff *skb;
2067 struct qllc *qllcptr;
2068 struct ctcm_priv *priv = dev->ml_priv;
2069 struct mpc_group *grp = priv->mpcg;
2070
2071 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2072 __func__, mpcg_state_names[grp->saved_state]);
2073
2074 switch (grp->saved_state) {
2075 /*
2076 * establish conn callback function is
2077 * preferred method to report failure
2078 */
2079 case MPCG_STATE_XID0IOWAIT:
2080 case MPCG_STATE_XID0IOWAIX:
2081 case MPCG_STATE_XID7INITI:
2082 case MPCG_STATE_XID7INITZ:
2083 case MPCG_STATE_XID2INITW:
2084 case MPCG_STATE_XID2INITX:
2085 case MPCG_STATE_XID7INITW:
2086 case MPCG_STATE_XID7INITX:
2087 if (grp->estconnfunc) {
2088 grp->estconnfunc(grp->port_num, -1, 0);
2089 grp->estconnfunc = NULL;
2090 break;
2091 }
2092 case MPCG_STATE_FLOWC:
2093 case MPCG_STATE_READY:
2094 grp->send_qllc_disc = 2;
2095 new_len = sizeof(struct qllc);
2096 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2097 if (qllcptr == NULL) {
2098 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2099 "%s(%s): qllcptr allocation error",
2100 CTCM_FUNTAIL, dev->name);
2101 return -ENOMEM;
2102 }
2103
2104 qllcptr->qllc_address = 0xcc;
2105 qllcptr->qllc_commands = 0x03;
2106
2107 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2108
2109 if (skb == NULL) {
2110 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2111 "%s(%s): skb allocation error",
2112 CTCM_FUNTAIL, dev->name);
2113 priv->stats.rx_dropped++;
2114 kfree(qllcptr);
2115 return -ENOMEM;
2116 }
2117
2118 skb_put_data(skb, qllcptr, new_len);
2119 kfree(qllcptr);
2120
2121 if (skb_headroom(skb) < 4) {
2122 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2123 "%s(%s): skb_headroom error",
2124 CTCM_FUNTAIL, dev->name);
2125 dev_kfree_skb_any(skb);
2126 return -ENOMEM;
2127 }
2128
2129 *((__u32 *)skb_push(skb, 4)) =
2130 priv->channel[CTCM_READ]->pdu_seq;
2131 priv->channel[CTCM_READ]->pdu_seq++;
2132 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2133 __func__, priv->channel[CTCM_READ]->pdu_seq);
2134
2135 /* receipt of CC03 resets anticipated sequence number on
2136 receiving side */
2137 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2138 skb_reset_mac_header(skb);
2139 skb->dev = dev;
2140 skb->protocol = htons(ETH_P_SNAP);
2141 skb->ip_summed = CHECKSUM_UNNECESSARY;
2142
2143 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2144
2145 netif_rx(skb);
2146 break;
2147 default:
2148 break;
2149
2150 }
2151
2152 return 0;
2153 }
2154 /* --- This is the END my friend --- */
2155
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