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drm/panel: samsung-s6e88a0-ams452ef01: transition to mipi_dsi wrapped functions
[drm/drm-misc.git] / drivers / s390 / net / ctcm_mpc.c
blob9e580ef69bdaabe69128399baba45f8e957691b3
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>
47 #include <linux/bitops.h>
48 #include <linux/uaccess.h>
49 #include <linux/wait.h>
50 #include <linux/moduleparam.h>
51 #include <asm/ccwdev.h>
52 #include <asm/ccwgroup.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 scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr);
148
149 scnprintf(boff, sizeof(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 scnprintf(tbuf, sizeof(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 scnprintf(tdup, sizeof(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 scnprintf(tdup, sizeof(tdup),
201 "Duplicate as above to %s", addr);
202 ctcm_pr_debug(" --- %s ---\n", tdup);
203 }
204 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
205 addr, boff, bhex, basc);
206 } else {
207 if (dup >= 1) {
208 scnprintf(tdup, sizeof(tdup),
209 "Duplicate as above to %s", addr);
210 ctcm_pr_debug(" --- %s ---\n", tdup);
211 }
212 if (dup != 0) {
213 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
214 addr, boff, bhex, basc);
215 }
216 }
217
218 return;
219
220 } /* end of ctcmpc_dumpit */
221 #endif
222
223 #ifdef DEBUGDATA
224 /*
225 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
226 *
227 * skb The sk_buff to dump.
228 * offset Offset relative to skb-data, where to start the dump.
229 */
230 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
231 {
232 __u8 *p = skb->data;
233 struct th_header *header;
234 struct pdu *pheader;
235 int bl = skb->len;
236 int i;
237
238 if (p == NULL)
239 return;
240
241 p += offset;
242 header = (struct th_header *)p;
243
244 ctcm_pr_debug("dump:\n");
245 ctcm_pr_debug("skb len=%d \n", skb->len);
246 if (skb->len > 2) {
247 switch (header->th_ch_flag) {
248 case TH_HAS_PDU:
249 break;
250 case 0x00:
251 case TH_IS_XID:
252 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
253 (header->th_is_xid == 0x01))
254 goto dumpth;
255 case TH_SWEEP_REQ:
256 goto dumpth;
257 case TH_SWEEP_RESP:
258 goto dumpth;
259 default:
260 break;
261 }
262
263 pheader = (struct pdu *)p;
264 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
265 pheader->pdu_offset, pheader->pdu_offset);
266 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
267 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
268 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
269 goto dumpdata;
270
271 dumpth:
272 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
273 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
274 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
275 ctcm_pr_debug("th->type : %s\n",
276 (header->th_is_xid) ? "DATA" : "XID");
277 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
278
279 }
280 dumpdata:
281 if (bl > 32)
282 bl = 32;
283 ctcm_pr_debug("data: ");
284 for (i = 0; i < bl; i++)
285 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
286 ctcm_pr_debug("\n");
287 }
288 #endif
289
290 static struct net_device *ctcmpc_get_dev(int port_num)
291 {
292 char device[20];
293 struct net_device *dev;
294 struct ctcm_priv *priv;
295
296 scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num);
297
298 dev = __dev_get_by_name(&init_net, device);
299
300 if (dev == NULL) {
301 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
302 "%s: Device not found by name: %s",
303 CTCM_FUNTAIL, device);
304 return NULL;
305 }
306 priv = dev->ml_priv;
307 if (priv == NULL) {
308 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
309 "%s(%s): dev->ml_priv is NULL",
310 CTCM_FUNTAIL, device);
311 return NULL;
312 }
313 if (priv->mpcg == NULL) {
314 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
315 "%s(%s): priv->mpcg is NULL",
316 CTCM_FUNTAIL, device);
317 return NULL;
318 }
319 return dev;
320 }
321
322 /*
323 * ctc_mpc_alloc_channel
324 * (exported interface)
325 *
326 * Device Initialization :
327 * ACTPATH driven IO operations
328 */
329 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
330 {
331 struct net_device *dev;
332 struct mpc_group *grp;
333 struct ctcm_priv *priv;
334
335 dev = ctcmpc_get_dev(port_num);
336 if (dev == NULL)
337 return 1;
338 priv = dev->ml_priv;
339 grp = priv->mpcg;
340
341 grp->allochanfunc = callback;
342 grp->port_num = port_num;
343 grp->port_persist = 1;
344
345 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
346 "%s(%s): state=%s",
347 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
348
349 switch (fsm_getstate(grp->fsm)) {
350 case MPCG_STATE_INOP:
351 /* Group is in the process of terminating */
352 grp->alloc_called = 1;
353 break;
354 case MPCG_STATE_RESET:
355 /* MPC Group will transition to state */
356 /* MPCG_STATE_XID2INITW iff the minimum number */
357 /* of 1 read and 1 write channel have successfully*/
358 /* activated */
359 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
360 if (callback)
361 grp->send_qllc_disc = 1;
362 fallthrough;
363 case MPCG_STATE_XID0IOWAIT:
364 fsm_deltimer(&grp->timer);
365 grp->outstanding_xid2 = 0;
366 grp->outstanding_xid7 = 0;
367 grp->outstanding_xid7_p2 = 0;
368 grp->saved_xid2 = NULL;
369 if (callback)
370 ctcm_open(dev);
371 fsm_event(priv->fsm, DEV_EVENT_START, dev);
372 break;
373 case MPCG_STATE_READY:
374 /* XID exchanges completed after PORT was activated */
375 /* Link station already active */
376 /* Maybe timing issue...retry callback */
377 grp->allocchan_callback_retries++;
378 if (grp->allocchan_callback_retries < 4) {
379 if (grp->allochanfunc)
380 grp->allochanfunc(grp->port_num,
381 grp->group_max_buflen);
382 } else {
383 /* there are problems...bail out */
384 /* there may be a state mismatch so restart */
385 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
386 grp->allocchan_callback_retries = 0;
387 }
388 break;
389 }
390
391 return 0;
392 }
393 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
394
395 /*
396 * ctc_mpc_establish_connectivity
397 * (exported interface)
398 */
399 void ctc_mpc_establish_connectivity(int port_num,
400 void (*callback)(int, int, int))
401 {
402 struct net_device *dev;
403 struct mpc_group *grp;
404 struct ctcm_priv *priv;
405 struct channel *rch, *wch;
406
407 dev = ctcmpc_get_dev(port_num);
408 if (dev == NULL)
409 return;
410 priv = dev->ml_priv;
411 grp = priv->mpcg;
412 rch = priv->channel[CTCM_READ];
413 wch = priv->channel[CTCM_WRITE];
414
415 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
416 "%s(%s): state=%s",
417 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
418
419 grp->estconnfunc = callback;
420 grp->port_num = port_num;
421
422 switch (fsm_getstate(grp->fsm)) {
423 case MPCG_STATE_READY:
424 /* XID exchanges completed after PORT was activated */
425 /* Link station already active */
426 /* Maybe timing issue...retry callback */
427 fsm_deltimer(&grp->timer);
428 grp->estconn_callback_retries++;
429 if (grp->estconn_callback_retries < 4) {
430 if (grp->estconnfunc) {
431 grp->estconnfunc(grp->port_num, 0,
432 grp->group_max_buflen);
433 grp->estconnfunc = NULL;
434 }
435 } else {
436 /* there are problems...bail out */
437 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
438 grp->estconn_callback_retries = 0;
439 }
440 break;
441 case MPCG_STATE_INOP:
442 case MPCG_STATE_RESET:
443 /* MPC Group is not ready to start XID - min num of */
444 /* 1 read and 1 write channel have not been acquired*/
445
446 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
447 "%s(%s): REJECTED - inactive channels",
448 CTCM_FUNTAIL, dev->name);
449 if (grp->estconnfunc) {
450 grp->estconnfunc(grp->port_num, -1, 0);
451 grp->estconnfunc = NULL;
452 }
453 break;
454 case MPCG_STATE_XID2INITW:
455 /* alloc channel was called but no XID exchange */
456 /* has occurred. initiate xside XID exchange */
457 /* make sure yside XID0 processing has not started */
458
459 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
460 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
461 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
462 "%s(%s): ABORT - PASSIVE XID",
463 CTCM_FUNTAIL, dev->name);
464 break;
465 }
466 grp->send_qllc_disc = 1;
467 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
468 fsm_deltimer(&grp->timer);
469 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
470 MPCG_EVENT_TIMER, dev);
471 grp->outstanding_xid7 = 0;
472 grp->outstanding_xid7_p2 = 0;
473 grp->saved_xid2 = NULL;
474 if ((rch->in_mpcgroup) &&
475 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
476 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
477 else {
478 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
479 "%s(%s): RX-%s not ready for ACTIVE XID0",
480 CTCM_FUNTAIL, dev->name, rch->id);
481 if (grp->estconnfunc) {
482 grp->estconnfunc(grp->port_num, -1, 0);
483 grp->estconnfunc = NULL;
484 }
485 fsm_deltimer(&grp->timer);
486 goto done;
487 }
488 if ((wch->in_mpcgroup) &&
489 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
490 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
491 else {
492 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
493 "%s(%s): WX-%s not ready for ACTIVE XID0",
494 CTCM_FUNTAIL, dev->name, wch->id);
495 if (grp->estconnfunc) {
496 grp->estconnfunc(grp->port_num, -1, 0);
497 grp->estconnfunc = NULL;
498 }
499 fsm_deltimer(&grp->timer);
500 goto done;
501 }
502 break;
503 case MPCG_STATE_XID0IOWAIT:
504 /* already in active XID negotiations */
505 default:
506 break;
507 }
508
509 done:
510 CTCM_PR_DEBUG("Exit %s()\n", __func__);
511 return;
512 }
513 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
514
515 /*
516 * ctc_mpc_dealloc_ch
517 * (exported interface)
518 */
519 void ctc_mpc_dealloc_ch(int port_num)
520 {
521 struct net_device *dev;
522 struct ctcm_priv *priv;
523 struct mpc_group *grp;
524
525 dev = ctcmpc_get_dev(port_num);
526 if (dev == NULL)
527 return;
528 priv = dev->ml_priv;
529 grp = priv->mpcg;
530
531 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
532 "%s: %s: refcount = %d\n",
533 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
534
535 fsm_deltimer(&priv->restart_timer);
536 grp->channels_terminating = 0;
537 fsm_deltimer(&grp->timer);
538 grp->allochanfunc = NULL;
539 grp->estconnfunc = NULL;
540 grp->port_persist = 0;
541 grp->send_qllc_disc = 0;
542 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
543
544 ctcm_close(dev);
545 return;
546 }
547 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
548
549 /*
550 * ctc_mpc_flow_control
551 * (exported interface)
552 */
553 void ctc_mpc_flow_control(int port_num, int flowc)
554 {
555 struct ctcm_priv *priv;
556 struct mpc_group *grp;
557 struct net_device *dev;
558 struct channel *rch;
559 int mpcg_state;
560
561 dev = ctcmpc_get_dev(port_num);
562 if (dev == NULL)
563 return;
564 priv = dev->ml_priv;
565 grp = priv->mpcg;
566
567 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
568 "%s: %s: flowc = %d",
569 CTCM_FUNTAIL, dev->name, flowc);
570
571 rch = priv->channel[CTCM_READ];
572
573 mpcg_state = fsm_getstate(grp->fsm);
574 switch (flowc) {
575 case 1:
576 if (mpcg_state == MPCG_STATE_FLOWC)
577 break;
578 if (mpcg_state == MPCG_STATE_READY) {
579 if (grp->flow_off_called == 1)
580 grp->flow_off_called = 0;
581 else
582 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
583 break;
584 }
585 break;
586 case 0:
587 if (mpcg_state == MPCG_STATE_FLOWC) {
588 fsm_newstate(grp->fsm, MPCG_STATE_READY);
589 /* ensure any data that has accumulated */
590 /* on the io_queue will now be sen t */
591 tasklet_schedule(&rch->ch_tasklet);
592 }
593 /* possible race condition */
594 if (mpcg_state == MPCG_STATE_READY) {
595 grp->flow_off_called = 1;
596 break;
597 }
598 break;
599 }
600
601 }
602 EXPORT_SYMBOL(ctc_mpc_flow_control);
603
604 static int mpc_send_qllc_discontact(struct net_device *);
605
606 /*
607 * helper function of ctcmpc_unpack_skb
608 */
609 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
610 {
611 struct channel *rch = mpcginfo->ch;
612 struct net_device *dev = rch->netdev;
613 struct ctcm_priv *priv = dev->ml_priv;
614 struct mpc_group *grp = priv->mpcg;
615 struct channel *ch = priv->channel[CTCM_WRITE];
616
617 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
618 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
619
620 grp->sweep_rsp_pend_num--;
621
622 if ((grp->sweep_req_pend_num == 0) &&
623 (grp->sweep_rsp_pend_num == 0)) {
624 fsm_deltimer(&ch->sweep_timer);
625 grp->in_sweep = 0;
626 rch->th_seq_num = 0x00;
627 ch->th_seq_num = 0x00;
628 ctcm_clear_busy_do(dev);
629 }
630
631 return;
632
633 }
634
635 /*
636 * helper function of mpc_rcvd_sweep_req
637 * which is a helper of ctcmpc_unpack_skb
638 */
639 static void ctcmpc_send_sweep_resp(struct channel *rch)
640 {
641 struct net_device *dev = rch->netdev;
642 struct ctcm_priv *priv = dev->ml_priv;
643 struct mpc_group *grp = priv->mpcg;
644 struct th_sweep *header;
645 struct sk_buff *sweep_skb;
646 struct channel *ch = priv->channel[CTCM_WRITE];
647
648 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
649
650 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
651 if (sweep_skb == NULL) {
652 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
653 "%s(%s): sweep_skb allocation ERROR\n",
654 CTCM_FUNTAIL, rch->id);
655 goto done;
656 }
657
658 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
659 header->th.th_ch_flag = TH_SWEEP_RESP;
660 header->sw.th_last_seq = ch->th_seq_num;
661
662 netif_trans_update(dev);
663 skb_queue_tail(&ch->sweep_queue, sweep_skb);
664
665 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
666
667 return;
668
669 done:
670 grp->in_sweep = 0;
671 ctcm_clear_busy_do(dev);
672 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
673
674 return;
675 }
676
677 /*
678 * helper function of ctcmpc_unpack_skb
679 */
680 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
681 {
682 struct channel *rch = mpcginfo->ch;
683 struct net_device *dev = rch->netdev;
684 struct ctcm_priv *priv = dev->ml_priv;
685 struct mpc_group *grp = priv->mpcg;
686 struct channel *ch = priv->channel[CTCM_WRITE];
687
688 if (do_debug)
689 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
690 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
691
692 if (grp->in_sweep == 0) {
693 grp->in_sweep = 1;
694 ctcm_test_and_set_busy(dev);
695 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
696 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
697 }
698
699 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
700
701 grp->sweep_req_pend_num--;
702 ctcmpc_send_sweep_resp(ch);
703 kfree(mpcginfo);
704 return;
705 }
706
707 /*
708 * MPC Group Station FSM definitions
709 */
710 static const char *mpcg_event_names[] = {
711 [MPCG_EVENT_INOP] = "INOP Condition",
712 [MPCG_EVENT_DISCONC] = "Discontact Received",
713 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
714 [MPCG_EVENT_XID2] = "XID2 Received",
715 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
716 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
717 [MPCG_EVENT_TIMER] = "XID Setup Timer",
718 [MPCG_EVENT_DOIO] = "XID DoIO",
719 };
720
721 static const char *mpcg_state_names[] = {
722 [MPCG_STATE_RESET] = "Reset",
723 [MPCG_STATE_INOP] = "INOP",
724 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
725 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
726 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
727 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
728 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
729 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
730 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
731 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
732 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
733 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
734 [MPCG_STATE_READY] = "READY",
735 };
736
737 /*
738 * The MPC Group Station FSM
739 * 22 events
740 */
741 static const fsm_node mpcg_fsm[] = {
742 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
743 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
744 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
745
746 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
747 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
748
749 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
750 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
751 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
752 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
753 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
754
755 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
756 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
757 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
758 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
759 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
760
761 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
762 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
763 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
764 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
765 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
766 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
767 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
768
769 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
770 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
771 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
772 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
773 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
774 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
775
776 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
777 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
778 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
779 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
780 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
781 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
782
783 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
784 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
785 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
786 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
787 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
788 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
789
790 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
791 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
792 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
793 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
794 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
795 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
796 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
797
798 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
799 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
800 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
801 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
802 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
803 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
804
805 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
806 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
807 };
808
809 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
810
811 /*
812 * MPC Group Station FSM action
813 * CTCM_PROTO_MPC only
814 */
815 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
816 {
817 struct net_device *dev = arg;
818 struct ctcm_priv *priv = dev->ml_priv;
819 struct mpc_group *grp = priv->mpcg;
820
821 if (grp == NULL) {
822 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
823 "%s(%s): No MPC group",
824 CTCM_FUNTAIL, dev->name);
825 return;
826 }
827
828 fsm_deltimer(&grp->timer);
829
830 if (grp->saved_xid2->xid2_flag2 == 0x40) {
831 priv->xid->xid2_flag2 = 0x00;
832 if (grp->estconnfunc) {
833 grp->estconnfunc(grp->port_num, 1,
834 grp->group_max_buflen);
835 grp->estconnfunc = NULL;
836 } else if (grp->allochanfunc)
837 grp->send_qllc_disc = 1;
838
839 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
840 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
841 "%s(%s): fails",
842 CTCM_FUNTAIL, dev->name);
843 return;
844 }
845
846 grp->port_persist = 1;
847 grp->out_of_sequence = 0;
848 grp->estconn_called = 0;
849
850 tasklet_hi_schedule(&grp->mpc_tasklet2);
851
852 return;
853 }
854
855 /*
856 * helper of ctcm_init_netdevice
857 * CTCM_PROTO_MPC only
858 */
859 void mpc_group_ready(unsigned long adev)
860 {
861 struct net_device *dev = (struct net_device *)adev;
862 struct ctcm_priv *priv = dev->ml_priv;
863 struct mpc_group *grp = priv->mpcg;
864 struct channel *ch = NULL;
865
866 if (grp == NULL) {
867 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
868 "%s(%s): No MPC group",
869 CTCM_FUNTAIL, dev->name);
870 return;
871 }
872
873 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
874 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
875 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
876
877 fsm_newstate(grp->fsm, MPCG_STATE_READY);
878
879 /* Put up a read on the channel */
880 ch = priv->channel[CTCM_READ];
881 ch->pdu_seq = 0;
882 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
883 __func__, ch->pdu_seq);
884
885 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
886 /* Put the write channel in idle state */
887 ch = priv->channel[CTCM_WRITE];
888 if (ch->collect_len > 0) {
889 spin_lock(&ch->collect_lock);
890 ctcm_purge_skb_queue(&ch->collect_queue);
891 ch->collect_len = 0;
892 spin_unlock(&ch->collect_lock);
893 }
894 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
895 ctcm_clear_busy(dev);
896
897 if (grp->estconnfunc) {
898 grp->estconnfunc(grp->port_num, 0,
899 grp->group_max_buflen);
900 grp->estconnfunc = NULL;
901 } else if (grp->allochanfunc) {
902 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
903 }
904
905 grp->send_qllc_disc = 1;
906 grp->changed_side = 0;
907
908 return;
909
910 }
911
912 /*
913 * Increment the MPC Group Active Channel Counts
914 * helper of dev_action (called from channel fsm)
915 */
916 void mpc_channel_action(struct channel *ch, int direction, int action)
917 {
918 struct net_device *dev = ch->netdev;
919 struct ctcm_priv *priv = dev->ml_priv;
920 struct mpc_group *grp = priv->mpcg;
921
922 if (grp == NULL) {
923 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
924 "%s(%s): No MPC group",
925 CTCM_FUNTAIL, dev->name);
926 return;
927 }
928
929 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
930
931 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
932 "%s: %i / Grp:%s total_channels=%i, active_channels: "
933 "read=%i, write=%i\n", __func__, action,
934 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
935 grp->active_channels[CTCM_READ],
936 grp->active_channels[CTCM_WRITE]);
937
938 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
939 grp->num_channel_paths++;
940 grp->active_channels[direction]++;
941 grp->outstanding_xid2++;
942 ch->in_mpcgroup = 1;
943
944 if (ch->xid_skb != NULL)
945 dev_kfree_skb_any(ch->xid_skb);
946
947 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
948 GFP_ATOMIC | GFP_DMA);
949 if (ch->xid_skb == NULL) {
950 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
951 "%s(%s): Couldn't alloc ch xid_skb\n",
952 CTCM_FUNTAIL, dev->name);
953 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
954 return;
955 }
956 ch->xid_skb_data = ch->xid_skb->data;
957 ch->xid_th = (struct th_header *)ch->xid_skb->data;
958 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
959 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
960 skb_put(ch->xid_skb, XID2_LENGTH);
961 ch->xid_id = skb_tail_pointer(ch->xid_skb);
962 ch->xid_skb->data = ch->xid_skb_data;
963 skb_reset_tail_pointer(ch->xid_skb);
964 ch->xid_skb->len = 0;
965
966 skb_put_data(ch->xid_skb, grp->xid_skb->data,
967 grp->xid_skb->len);
968
969 ch->xid->xid2_dlc_type =
970 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
971 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
972
973 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
974 ch->xid->xid2_buf_len = 0x00;
975
976 ch->xid_skb->data = ch->xid_skb_data;
977 skb_reset_tail_pointer(ch->xid_skb);
978 ch->xid_skb->len = 0;
979
980 fsm_newstate(ch->fsm, CH_XID0_PENDING);
981
982 if ((grp->active_channels[CTCM_READ] > 0) &&
983 (grp->active_channels[CTCM_WRITE] > 0) &&
984 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
985 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
986 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
987 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
988 __func__, dev->name);
989 }
990 } else if ((action == MPC_CHANNEL_REMOVE) &&
991 (ch->in_mpcgroup == 1)) {
992 ch->in_mpcgroup = 0;
993 grp->num_channel_paths--;
994 grp->active_channels[direction]--;
995
996 if (ch->xid_skb != NULL)
997 dev_kfree_skb_any(ch->xid_skb);
998 ch->xid_skb = NULL;
999
1000 if (grp->channels_terminating)
1001 goto done;
1002
1003 if (((grp->active_channels[CTCM_READ] == 0) &&
1004 (grp->active_channels[CTCM_WRITE] > 0))
1005 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1006 (grp->active_channels[CTCM_READ] > 0)))
1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008 }
1009 done:
1010 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1011 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1012 "read=%i, write=%i\n", __func__, action,
1013 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1014 grp->active_channels[CTCM_READ],
1015 grp->active_channels[CTCM_WRITE]);
1016
1017 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1018 }
1019
1020 /*
1021 * Unpack a just received skb and hand it over to
1022 * upper layers.
1023 * special MPC version of unpack_skb.
1024 *
1025 * ch The channel where this skb has been received.
1026 * pskb The received skb.
1027 */
1028 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1029 {
1030 struct net_device *dev = ch->netdev;
1031 struct ctcm_priv *priv = dev->ml_priv;
1032 struct mpc_group *grp = priv->mpcg;
1033 struct pdu *curr_pdu;
1034 struct mpcg_info *mpcginfo;
1035 struct th_header *header = NULL;
1036 struct th_sweep *sweep = NULL;
1037 int pdu_last_seen = 0;
1038 __u32 new_len;
1039 struct sk_buff *skb;
1040 int skblen;
1041 int sendrc = 0;
1042
1043 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1044 __func__, dev->name, smp_processor_id(), ch->id);
1045
1046 header = (struct th_header *)pskb->data;
1047 if ((header->th_seg == 0) &&
1048 (header->th_ch_flag == 0) &&
1049 (header->th_blk_flag == 0) &&
1050 (header->th_seq_num == 0))
1051 /* nothing for us */ goto done;
1052
1053 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1054 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1055 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1056
1057 pskb->dev = dev;
1058 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1059 skb_pull(pskb, TH_HEADER_LENGTH);
1060
1061 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1062 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1063 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1064 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1065 (header->th_seq_num != ch->th_seq_num + 1) &&
1066 (ch->th_seq_num != 0))) {
1067 /* This is NOT the next segment *
1068 * we are not the correct race winner *
1069 * go away and let someone else win *
1070 * BUT..this only applies if xid negot *
1071 * is done *
1072 */
1073 grp->out_of_sequence += 1;
1074 __skb_push(pskb, TH_HEADER_LENGTH);
1075 skb_queue_tail(&ch->io_queue, pskb);
1076 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1077 "got:%08x\n", __func__,
1078 ch->th_seq_num + 1, header->th_seq_num);
1079
1080 return;
1081 }
1082 grp->out_of_sequence = 0;
1083 ch->th_seq_num = header->th_seq_num;
1084
1085 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1086 __func__, ch->th_seq_num);
1087
1088 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1089 goto done;
1090 while ((pskb->len > 0) && !pdu_last_seen) {
1091 curr_pdu = (struct pdu *)pskb->data;
1092
1093 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1094 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1095 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1096 __func__, pskb->len);
1097
1098 skb_pull(pskb, PDU_HEADER_LENGTH);
1099
1100 if (curr_pdu->pdu_flag & PDU_LAST)
1101 pdu_last_seen = 1;
1102 if (curr_pdu->pdu_flag & PDU_CNTL)
1103 pskb->protocol = htons(ETH_P_SNAP);
1104 else
1105 pskb->protocol = htons(ETH_P_SNA_DIX);
1106
1107 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1108 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1109 "%s(%s): Dropping packet with "
1110 "illegal siize %d",
1111 CTCM_FUNTAIL, dev->name, pskb->len);
1112
1113 priv->stats.rx_dropped++;
1114 priv->stats.rx_length_errors++;
1115 goto done;
1116 }
1117 skb_reset_mac_header(pskb);
1118 new_len = curr_pdu->pdu_offset;
1119 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1120 __func__, new_len);
1121 if ((new_len == 0) || (new_len > pskb->len)) {
1122 /* should never happen */
1123 /* pskb len must be hosed...bail out */
1124 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1125 "%s(%s): non valid pdu_offset: %04x",
1126 /* "data may be lost", */
1127 CTCM_FUNTAIL, dev->name, new_len);
1128 goto done;
1129 }
1130 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1131
1132 if (!skb) {
1133 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1134 "%s(%s): MEMORY allocation error",
1135 CTCM_FUNTAIL, dev->name);
1136 priv->stats.rx_dropped++;
1137 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1138 goto done;
1139 }
1140 skb_put_data(skb, pskb->data, new_len);
1141
1142 skb_reset_mac_header(skb);
1143 skb->dev = pskb->dev;
1144 skb->protocol = pskb->protocol;
1145 skb->ip_summed = CHECKSUM_UNNECESSARY;
1146 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1147 ch->pdu_seq++;
1148
1149 if (do_debug_data) {
1150 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1151 __func__, ch->pdu_seq);
1152 ctcm_pr_debug("%s: skb:%0lx "
1153 "skb len: %d \n", __func__,
1154 (unsigned long)skb, skb->len);
1155 ctcm_pr_debug("%s: up to 32 bytes "
1156 "of pdu_data sent\n", __func__);
1157 ctcmpc_dump32((char *)skb->data, skb->len);
1158 }
1159
1160 skblen = skb->len;
1161 sendrc = netif_rx(skb);
1162 priv->stats.rx_packets++;
1163 priv->stats.rx_bytes += skblen;
1164 skb_pull(pskb, new_len); /* point to next PDU */
1165 }
1166 } else {
1167 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1168 if (mpcginfo == NULL)
1169 goto done;
1170
1171 mpcginfo->ch = ch;
1172 mpcginfo->th = header;
1173 mpcginfo->skb = pskb;
1174 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1175 __func__);
1176 /* it's a sweep? */
1177 sweep = (struct th_sweep *)pskb->data;
1178 mpcginfo->sweep = sweep;
1179 if (header->th_ch_flag == TH_SWEEP_REQ)
1180 mpc_rcvd_sweep_req(mpcginfo);
1181 else if (header->th_ch_flag == TH_SWEEP_RESP)
1182 mpc_rcvd_sweep_resp(mpcginfo);
1183 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1184 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1185 skb_pull(pskb, XID2_LENGTH);
1186 mpcginfo->xid = thisxid;
1187 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1188 } else if (header->th_blk_flag == TH_DISCONTACT)
1189 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1190 else if (header->th_seq_num != 0) {
1191 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1192 "%s(%s): control pkt expected\n",
1193 CTCM_FUNTAIL, dev->name);
1194 priv->stats.rx_dropped++;
1195 /* mpcginfo only used for non-data transfers */
1196 if (do_debug_data)
1197 ctcmpc_dump_skb(pskb, -8);
1198 }
1199 kfree(mpcginfo);
1200 }
1201 done:
1202
1203 dev_kfree_skb_any(pskb);
1204 if (sendrc == NET_RX_DROP) {
1205 dev_warn(&dev->dev,
1206 "The network backlog for %s is exceeded, "
1207 "package dropped\n", __func__);
1208 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1209 }
1210
1211 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1212 __func__, dev->name, ch, ch->id);
1213 }
1214
1215 /*
1216 * tasklet helper for mpc's skb unpacking.
1217 *
1218 * ch The channel to work on.
1219 * Allow flow control back pressure to occur here.
1220 * Throttling back channel can result in excessive
1221 * channel inactivity and system deact of channel
1222 */
1223 void ctcmpc_bh(unsigned long thischan)
1224 {
1225 struct channel *ch = (struct channel *)thischan;
1226 struct sk_buff *skb;
1227 struct net_device *dev = ch->netdev;
1228 struct ctcm_priv *priv = dev->ml_priv;
1229 struct mpc_group *grp = priv->mpcg;
1230
1231 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1232 dev->name, smp_processor_id(), __func__, ch->id);
1233 /* caller has requested driver to throttle back */
1234 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1235 (skb = skb_dequeue(&ch->io_queue))) {
1236 ctcmpc_unpack_skb(ch, skb);
1237 if (grp->out_of_sequence > 20) {
1238 /* assume data loss has occurred if */
1239 /* missing seq_num for extended */
1240 /* period of time */
1241 grp->out_of_sequence = 0;
1242 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1243 break;
1244 }
1245 if (skb == skb_peek(&ch->io_queue))
1246 break;
1247 }
1248 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1249 __func__, dev->name, ch, ch->id);
1250 return;
1251 }
1252
1253 /*
1254 * MPC Group Initializations
1255 */
1256 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1257 {
1258 struct mpc_group *grp;
1259
1260 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1261 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1262
1263 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1264 if (grp == NULL)
1265 return NULL;
1266
1267 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1268 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1269 mpcg_fsm_len, GFP_KERNEL);
1270 if (grp->fsm == NULL) {
1271 kfree(grp);
1272 return NULL;
1273 }
1274
1275 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1276 fsm_settimer(grp->fsm, &grp->timer);
1277
1278 grp->xid_skb =
1279 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1280 if (grp->xid_skb == NULL) {
1281 kfree_fsm(grp->fsm);
1282 kfree(grp);
1283 return NULL;
1284 }
1285 /* base xid for all channels in group */
1286 grp->xid_skb_data = grp->xid_skb->data;
1287 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1288 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1289
1290 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1291 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1292 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1293 grp->xid->xid2_sender_id = jiffies;
1294
1295 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1296 skb_put_data(grp->xid_skb, "VTAM", 4);
1297
1298 grp->rcvd_xid_skb =
1299 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1300 if (grp->rcvd_xid_skb == NULL) {
1301 kfree_fsm(grp->fsm);
1302 dev_kfree_skb(grp->xid_skb);
1303 kfree(grp);
1304 return NULL;
1305 }
1306 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1307 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1308 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1309 grp->saved_xid2 = NULL;
1310 priv->xid = grp->xid;
1311 priv->mpcg = grp;
1312 return grp;
1313 }
1314
1315 /*
1316 * The MPC Group Station FSM
1317 */
1318
1319 /*
1320 * MPC Group Station FSM actions
1321 * CTCM_PROTO_MPC only
1322 */
1323
1324 /*
1325 * NOP action for statemachines
1326 */
1327 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1328 {
1329 }
1330
1331 /*
1332 * invoked when the device transitions to dev_stopped
1333 * MPC will stop each individual channel if a single XID failure
1334 * occurs, or will intitiate all channels be stopped if a GROUP
1335 * level failure occurs.
1336 */
1337 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1338 {
1339 struct net_device *dev = arg;
1340 struct ctcm_priv *priv;
1341 struct mpc_group *grp;
1342 struct channel *wch;
1343
1344 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1345
1346 priv = dev->ml_priv;
1347 grp = priv->mpcg;
1348 grp->flow_off_called = 0;
1349 fsm_deltimer(&grp->timer);
1350 if (grp->channels_terminating)
1351 return;
1352
1353 grp->channels_terminating = 1;
1354 grp->saved_state = fsm_getstate(grp->fsm);
1355 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1356 if (grp->saved_state > MPCG_STATE_XID7INITF)
1357 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1358 "%s(%s): MPC GROUP INOPERATIVE",
1359 CTCM_FUNTAIL, dev->name);
1360 if ((grp->saved_state != MPCG_STATE_RESET) ||
1361 /* dealloc_channel has been called */
1362 (grp->port_persist == 0))
1363 fsm_deltimer(&priv->restart_timer);
1364
1365 wch = priv->channel[CTCM_WRITE];
1366
1367 switch (grp->saved_state) {
1368 case MPCG_STATE_RESET:
1369 case MPCG_STATE_INOP:
1370 case MPCG_STATE_XID2INITW:
1371 case MPCG_STATE_XID0IOWAIT:
1372 case MPCG_STATE_XID2INITX:
1373 case MPCG_STATE_XID7INITW:
1374 case MPCG_STATE_XID7INITX:
1375 case MPCG_STATE_XID0IOWAIX:
1376 case MPCG_STATE_XID7INITI:
1377 case MPCG_STATE_XID7INITZ:
1378 case MPCG_STATE_XID7INITF:
1379 break;
1380 case MPCG_STATE_FLOWC:
1381 case MPCG_STATE_READY:
1382 default:
1383 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1384 }
1385
1386 grp->xid2_tgnum = 0;
1387 grp->group_max_buflen = 0; /*min of all received */
1388 grp->outstanding_xid2 = 0;
1389 grp->outstanding_xid7 = 0;
1390 grp->outstanding_xid7_p2 = 0;
1391 grp->saved_xid2 = NULL;
1392 grp->xidnogood = 0;
1393 grp->changed_side = 0;
1394
1395 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1396 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1397 grp->rcvd_xid_skb->len = 0;
1398 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1399 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1400
1401 if (grp->send_qllc_disc == 1) {
1402 grp->send_qllc_disc = 0;
1403 mpc_send_qllc_discontact(dev);
1404 }
1405
1406 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1407 /* This can result in INOP of VTAM PU due to halting of */
1408 /* outstanding IO which causes a sense to be returned */
1409 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1410 /* become unreachable without manual intervention */
1411 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1412 grp->alloc_called = 0;
1413 fsm_deltimer(&priv->restart_timer);
1414 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1415 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1416 if (grp->saved_state > MPCG_STATE_XID7INITF)
1417 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1418 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1419 CTCM_FUNTAIL, dev->name);
1420 } else {
1421 fsm_deltimer(&priv->restart_timer);
1422 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1423 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1424 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1425 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1426 CTCM_FUNTAIL, dev->name);
1427 }
1428 }
1429
1430 /*
1431 * Handle mpc group action timeout.
1432 * MPC Group Station FSM action
1433 * CTCM_PROTO_MPC only
1434 *
1435 * fi An instance of an mpc_group fsm.
1436 * event The event, just happened.
1437 * arg Generic pointer, casted from net_device * upon call.
1438 */
1439 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1440 {
1441 struct net_device *dev = arg;
1442 struct ctcm_priv *priv;
1443 struct mpc_group *grp;
1444 struct channel *wch;
1445 struct channel *rch;
1446
1447 priv = dev->ml_priv;
1448 grp = priv->mpcg;
1449 wch = priv->channel[CTCM_WRITE];
1450 rch = priv->channel[CTCM_READ];
1451
1452 switch (fsm_getstate(grp->fsm)) {
1453 case MPCG_STATE_XID2INITW:
1454 /* Unless there is outstanding IO on the */
1455 /* channel just return and wait for ATTN */
1456 /* interrupt to begin XID negotiations */
1457 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1458 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1459 break;
1460 fallthrough;
1461 default:
1462 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1463 }
1464
1465 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1466 "%s: dev=%s exit",
1467 CTCM_FUNTAIL, dev->name);
1468 return;
1469 }
1470
1471 /*
1472 * MPC Group Station FSM action
1473 * CTCM_PROTO_MPC only
1474 */
1475 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1476 {
1477 struct mpcg_info *mpcginfo = arg;
1478 struct channel *ch = mpcginfo->ch;
1479 struct net_device *dev;
1480 struct ctcm_priv *priv;
1481 struct mpc_group *grp;
1482
1483 if (ch) {
1484 dev = ch->netdev;
1485 if (dev) {
1486 priv = dev->ml_priv;
1487 if (priv) {
1488 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1489 "%s: %s: %s\n",
1490 CTCM_FUNTAIL, dev->name, ch->id);
1491 grp = priv->mpcg;
1492 grp->send_qllc_disc = 1;
1493 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1494 }
1495 }
1496 }
1497
1498 return;
1499 }
1500
1501 /*
1502 * MPC Group Station - not part of FSM
1503 * CTCM_PROTO_MPC only
1504 * called from add_channel in ctcm_main.c
1505 */
1506 void mpc_action_send_discontact(unsigned long thischan)
1507 {
1508 int rc;
1509 struct channel *ch = (struct channel *)thischan;
1510 unsigned long saveflags = 0;
1511
1512 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1513 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1514 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1515
1516 if (rc != 0) {
1517 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1518 }
1519
1520 return;
1521 }
1522
1523
1524 /*
1525 * helper function of mpc FSM
1526 * CTCM_PROTO_MPC only
1527 * mpc_action_rcvd_xid7
1528 */
1529 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1530 {
1531 struct channel *ch = mpcginfo->ch;
1532 struct net_device *dev = ch->netdev;
1533 struct ctcm_priv *priv = dev->ml_priv;
1534 struct mpc_group *grp = priv->mpcg;
1535 struct xid2 *xid = mpcginfo->xid;
1536 int rc = 0;
1537 __u64 our_id = 0;
1538 __u64 their_id = 0;
1539 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1540
1541 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1542
1543 if (xid == NULL) {
1544 rc = 1;
1545 /* XID REJECTED: xid == NULL */
1546 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1547 "%s(%s): xid = NULL",
1548 CTCM_FUNTAIL, ch->id);
1549 goto done;
1550 }
1551
1552 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1553
1554 /*the received direction should be the opposite of ours */
1555 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1556 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1557 rc = 2;
1558 /* XID REJECTED: r/w channel pairing mismatch */
1559 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1560 "%s(%s): r/w channel pairing mismatch",
1561 CTCM_FUNTAIL, ch->id);
1562 goto done;
1563 }
1564
1565 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1566 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1567 grp->group_max_buflen, xid->xid2_buf_len);
1568
1569 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1570 xid->xid2_buf_len - len)
1571 grp->group_max_buflen = xid->xid2_buf_len - len;
1572 }
1573
1574 if (grp->saved_xid2 == NULL) {
1575 grp->saved_xid2 =
1576 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1577
1578 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1579 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1580
1581 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1582 grp->rcvd_xid_skb->len = 0;
1583
1584 /* convert two 32 bit numbers into 1 64 bit for id compare */
1585 our_id = (__u64)priv->xid->xid2_adj_id;
1586 our_id = our_id << 32;
1587 our_id = our_id + priv->xid->xid2_sender_id;
1588 their_id = (__u64)xid->xid2_adj_id;
1589 their_id = their_id << 32;
1590 their_id = their_id + xid->xid2_sender_id;
1591 /* lower id assume the xside role */
1592 if (our_id < their_id) {
1593 grp->roll = XSIDE;
1594 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1595 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1596 CTCM_FUNTAIL, ch->id);
1597 } else {
1598 grp->roll = YSIDE;
1599 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1600 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1601 CTCM_FUNTAIL, ch->id);
1602 }
1603
1604 } else {
1605 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1606 rc = 3;
1607 /* XID REJECTED: xid flag byte4 mismatch */
1608 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1609 "%s(%s): xid flag byte4 mismatch",
1610 CTCM_FUNTAIL, ch->id);
1611 }
1612 if (xid->xid2_flag2 == 0x40) {
1613 rc = 4;
1614 /* XID REJECTED - xid NOGOOD */
1615 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1616 "%s(%s): xid NOGOOD",
1617 CTCM_FUNTAIL, ch->id);
1618 }
1619 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1620 rc = 5;
1621 /* XID REJECTED - Adjacent Station ID Mismatch */
1622 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1623 "%s(%s): Adjacent Station ID Mismatch",
1624 CTCM_FUNTAIL, ch->id);
1625 }
1626 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1627 rc = 6;
1628 /* XID REJECTED - Sender Address Mismatch */
1629 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1630 "%s(%s): Sender Address Mismatch",
1631 CTCM_FUNTAIL, ch->id);
1632 }
1633 }
1634 done:
1635 if (rc) {
1636 dev_warn(&dev->dev,
1637 "The XID used in the MPC protocol is not valid, "
1638 "rc = %d\n", rc);
1639 priv->xid->xid2_flag2 = 0x40;
1640 grp->saved_xid2->xid2_flag2 = 0x40;
1641 }
1642
1643 return rc;
1644 }
1645
1646 /*
1647 * MPC Group Station FSM action
1648 * CTCM_PROTO_MPC only
1649 */
1650 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1651 {
1652 struct channel *ch = arg;
1653 int rc = 0;
1654 int gotlock = 0;
1655 unsigned long saveflags = 0; /* avoids compiler warning with
1656 spin_unlock_irqrestore */
1657
1658 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1659 __func__, smp_processor_id(), ch, ch->id);
1660
1661 if (ctcm_checkalloc_buffer(ch))
1662 goto done;
1663
1664 /*
1665 * skb data-buffer referencing:
1666 */
1667 ch->trans_skb->data = ch->trans_skb_data;
1668 skb_reset_tail_pointer(ch->trans_skb);
1669 ch->trans_skb->len = 0;
1670 /* result of the previous 3 statements is NOT always
1671 * already set after ctcm_checkalloc_buffer
1672 * because of possible reuse of the trans_skb
1673 */
1674 memset(ch->trans_skb->data, 0, 16);
1675 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1676 /* check is main purpose here: */
1677 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1678 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1679 /* check is main purpose here: */
1680 skb_put(ch->trans_skb, XID2_LENGTH);
1681 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1682 /* cleanup back to startpoint */
1683 ch->trans_skb->data = ch->trans_skb_data;
1684 skb_reset_tail_pointer(ch->trans_skb);
1685 ch->trans_skb->len = 0;
1686
1687 /* non-checking rewrite of above skb data-buffer referencing: */
1688 /*
1689 memset(ch->trans_skb->data, 0, 16);
1690 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1691 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1692 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1693 */
1694
1695 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1696 ch->ccw[8].count = 0;
1697 ch->ccw[8].cda = 0x00;
1698
1699 if (!(ch->xid_th && ch->xid && ch->xid_id))
1700 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1701 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1702 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1703
1704 if (side == XSIDE) {
1705 /* mpc_action_xside_xid */
1706 if (ch->xid_th == NULL)
1707 goto done;
1708 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1709 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1710 ch->ccw[9].count = TH_HEADER_LENGTH;
1711 ch->ccw[9].cda = virt_to_dma32(ch->xid_th);
1712
1713 if (ch->xid == NULL)
1714 goto done;
1715 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1716 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1717 ch->ccw[10].count = XID2_LENGTH;
1718 ch->ccw[10].cda = virt_to_dma32(ch->xid);
1719
1720 ch->ccw[11].cmd_code = CCW_CMD_READ;
1721 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1722 ch->ccw[11].count = TH_HEADER_LENGTH;
1723 ch->ccw[11].cda = virt_to_dma32(ch->rcvd_xid_th);
1724
1725 ch->ccw[12].cmd_code = CCW_CMD_READ;
1726 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1727 ch->ccw[12].count = XID2_LENGTH;
1728 ch->ccw[12].cda = virt_to_dma32(ch->rcvd_xid);
1729
1730 ch->ccw[13].cmd_code = CCW_CMD_READ;
1731 ch->ccw[13].cda = virt_to_dma32(ch->rcvd_xid_id);
1732
1733 } else { /* side == YSIDE : mpc_action_yside_xid */
1734 ch->ccw[9].cmd_code = CCW_CMD_READ;
1735 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1736 ch->ccw[9].count = TH_HEADER_LENGTH;
1737 ch->ccw[9].cda = virt_to_dma32(ch->rcvd_xid_th);
1738
1739 ch->ccw[10].cmd_code = CCW_CMD_READ;
1740 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1741 ch->ccw[10].count = XID2_LENGTH;
1742 ch->ccw[10].cda = virt_to_dma32(ch->rcvd_xid);
1743
1744 if (ch->xid_th == NULL)
1745 goto done;
1746 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1747 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1748 ch->ccw[11].count = TH_HEADER_LENGTH;
1749 ch->ccw[11].cda = virt_to_dma32(ch->xid_th);
1750
1751 if (ch->xid == NULL)
1752 goto done;
1753 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1754 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1755 ch->ccw[12].count = XID2_LENGTH;
1756 ch->ccw[12].cda = virt_to_dma32(ch->xid);
1757
1758 if (ch->xid_id == NULL)
1759 goto done;
1760 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1761 ch->ccw[13].cda = virt_to_dma32(ch->xid_id);
1762
1763 }
1764 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1765 ch->ccw[13].count = 4;
1766
1767 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1768 ch->ccw[14].flags = CCW_FLAG_SLI;
1769 ch->ccw[14].count = 0;
1770 ch->ccw[14].cda = 0;
1771
1772 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1773 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1774 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1775 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1776
1777 if (!in_hardirq()) {
1778 /* Such conditional locking is a known problem for
1779 * sparse because its static undeterministic.
1780 * Warnings should be ignored here. */
1781 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1782 gotlock = 1;
1783 }
1784
1785 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1786 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1787
1788 if (gotlock) /* see remark above about conditional locking */
1789 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1790
1791 if (rc != 0) {
1792 ctcm_ccw_check_rc(ch, rc,
1793 (side == XSIDE) ? "x-side XID" : "y-side XID");
1794 }
1795
1796 done:
1797 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1798 __func__, ch, ch->id);
1799 return;
1800
1801 }
1802
1803 /*
1804 * MPC Group Station FSM action
1805 * CTCM_PROTO_MPC only
1806 */
1807 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1808 {
1809 mpc_action_side_xid(fsm, arg, XSIDE);
1810 }
1811
1812 /*
1813 * MPC Group Station FSM action
1814 * CTCM_PROTO_MPC only
1815 */
1816 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1817 {
1818 mpc_action_side_xid(fsm, arg, YSIDE);
1819 }
1820
1821 /*
1822 * MPC Group Station FSM action
1823 * CTCM_PROTO_MPC only
1824 */
1825 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1826 {
1827 struct channel *ch = arg;
1828 struct net_device *dev = ch->netdev;
1829 struct ctcm_priv *priv = dev->ml_priv;
1830 struct mpc_group *grp = priv->mpcg;
1831
1832 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1833 __func__, smp_processor_id(), ch, ch->id);
1834
1835 if (ch->xid == NULL) {
1836 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1837 "%s(%s): ch->xid == NULL",
1838 CTCM_FUNTAIL, dev->name);
1839 return;
1840 }
1841
1842 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1843
1844 ch->xid->xid2_option = XID2_0;
1845
1846 switch (fsm_getstate(grp->fsm)) {
1847 case MPCG_STATE_XID2INITW:
1848 case MPCG_STATE_XID2INITX:
1849 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1850 break;
1851 case MPCG_STATE_XID0IOWAIT:
1852 case MPCG_STATE_XID0IOWAIX:
1853 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1854 break;
1855 }
1856
1857 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1858
1859 return;
1860 }
1861
1862 /*
1863 * MPC Group Station FSM action
1864 * CTCM_PROTO_MPC only
1865 */
1866 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1867 {
1868 struct net_device *dev = arg;
1869 struct ctcm_priv *priv = dev->ml_priv;
1870 struct mpc_group *grp = NULL;
1871 int direction;
1872 int send = 0;
1873
1874 if (priv)
1875 grp = priv->mpcg;
1876 if (grp == NULL)
1877 return;
1878
1879 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1880 struct channel *ch = priv->channel[direction];
1881 struct xid2 *thisxid = ch->xid;
1882 ch->xid_skb->data = ch->xid_skb_data;
1883 skb_reset_tail_pointer(ch->xid_skb);
1884 ch->xid_skb->len = 0;
1885 thisxid->xid2_option = XID2_7;
1886 send = 0;
1887
1888 /* xid7 phase 1 */
1889 if (grp->outstanding_xid7_p2 > 0) {
1890 if (grp->roll == YSIDE) {
1891 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1892 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1893 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1894 skb_put_data(ch->xid_skb, &thdummy,
1895 TH_HEADER_LENGTH);
1896 send = 1;
1897 }
1898 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1899 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1900 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1901 skb_put_data(ch->xid_skb, &thnorm,
1902 TH_HEADER_LENGTH);
1903 send = 1;
1904 }
1905 } else {
1906 /* xid7 phase 2 */
1907 if (grp->roll == YSIDE) {
1908 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1909 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1910 skb_put_data(ch->xid_skb, &thnorm,
1911 TH_HEADER_LENGTH);
1912 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1913 send = 1;
1914 }
1915 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1916 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1917 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1918 skb_put_data(ch->xid_skb, &thdummy,
1919 TH_HEADER_LENGTH);
1920 send = 1;
1921 }
1922 }
1923
1924 if (send)
1925 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1926 }
1927
1928 return;
1929 }
1930
1931 /*
1932 * MPC Group Station FSM action
1933 * CTCM_PROTO_MPC only
1934 */
1935 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1936 {
1937
1938 struct mpcg_info *mpcginfo = arg;
1939 struct channel *ch = mpcginfo->ch;
1940 struct net_device *dev = ch->netdev;
1941 struct ctcm_priv *priv = dev->ml_priv;
1942 struct mpc_group *grp = priv->mpcg;
1943
1944 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1945 __func__, ch->id, grp->outstanding_xid2,
1946 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1947
1948 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1949 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1950
1951 grp->outstanding_xid2--;
1952 grp->outstanding_xid7++;
1953 grp->outstanding_xid7_p2++;
1954
1955 /* must change state before validating xid to */
1956 /* properly handle interim interrupts received*/
1957 switch (fsm_getstate(grp->fsm)) {
1958 case MPCG_STATE_XID2INITW:
1959 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1960 mpc_validate_xid(mpcginfo);
1961 break;
1962 case MPCG_STATE_XID0IOWAIT:
1963 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1964 mpc_validate_xid(mpcginfo);
1965 break;
1966 case MPCG_STATE_XID2INITX:
1967 if (grp->outstanding_xid2 == 0) {
1968 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1969 mpc_validate_xid(mpcginfo);
1970 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1971 }
1972 break;
1973 case MPCG_STATE_XID0IOWAIX:
1974 if (grp->outstanding_xid2 == 0) {
1975 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1976 mpc_validate_xid(mpcginfo);
1977 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1978 }
1979 break;
1980 }
1981
1982 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1983 __func__, ch->id, grp->outstanding_xid2,
1984 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1985 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1986 __func__, ch->id,
1987 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1988 return;
1989
1990 }
1991
1992
1993 /*
1994 * MPC Group Station FSM action
1995 * CTCM_PROTO_MPC only
1996 */
1997 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
1998 {
1999 struct mpcg_info *mpcginfo = arg;
2000 struct channel *ch = mpcginfo->ch;
2001 struct net_device *dev = ch->netdev;
2002 struct ctcm_priv *priv = dev->ml_priv;
2003 struct mpc_group *grp = priv->mpcg;
2004
2005 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2006 __func__, smp_processor_id(), ch, ch->id);
2007 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2008 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2009
2010 grp->outstanding_xid7--;
2011 ch->xid_skb->data = ch->xid_skb_data;
2012 skb_reset_tail_pointer(ch->xid_skb);
2013 ch->xid_skb->len = 0;
2014
2015 switch (fsm_getstate(grp->fsm)) {
2016 case MPCG_STATE_XID7INITI:
2017 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2018 mpc_validate_xid(mpcginfo);
2019 break;
2020 case MPCG_STATE_XID7INITW:
2021 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2022 mpc_validate_xid(mpcginfo);
2023 break;
2024 case MPCG_STATE_XID7INITZ:
2025 case MPCG_STATE_XID7INITX:
2026 if (grp->outstanding_xid7 == 0) {
2027 if (grp->outstanding_xid7_p2 > 0) {
2028 grp->outstanding_xid7 =
2029 grp->outstanding_xid7_p2;
2030 grp->outstanding_xid7_p2 = 0;
2031 } else
2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2033
2034 mpc_validate_xid(mpcginfo);
2035 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2036 break;
2037 }
2038 mpc_validate_xid(mpcginfo);
2039 break;
2040 }
2041 return;
2042 }
2043
2044 /*
2045 * mpc_action helper of an MPC Group Station FSM action
2046 * CTCM_PROTO_MPC only
2047 */
2048 static int mpc_send_qllc_discontact(struct net_device *dev)
2049 {
2050 struct sk_buff *skb;
2051 struct qllc *qllcptr;
2052 struct ctcm_priv *priv = dev->ml_priv;
2053 struct mpc_group *grp = priv->mpcg;
2054
2055 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2056 __func__, mpcg_state_names[grp->saved_state]);
2057
2058 switch (grp->saved_state) {
2059 /*
2060 * establish conn callback function is
2061 * preferred method to report failure
2062 */
2063 case MPCG_STATE_XID0IOWAIT:
2064 case MPCG_STATE_XID0IOWAIX:
2065 case MPCG_STATE_XID7INITI:
2066 case MPCG_STATE_XID7INITZ:
2067 case MPCG_STATE_XID2INITW:
2068 case MPCG_STATE_XID2INITX:
2069 case MPCG_STATE_XID7INITW:
2070 case MPCG_STATE_XID7INITX:
2071 if (grp->estconnfunc) {
2072 grp->estconnfunc(grp->port_num, -1, 0);
2073 grp->estconnfunc = NULL;
2074 break;
2075 }
2076 fallthrough;
2077 case MPCG_STATE_FLOWC:
2078 case MPCG_STATE_READY:
2079 grp->send_qllc_disc = 2;
2080
2081 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2082 if (skb == NULL) {
2083 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2084 "%s(%s): skb allocation error",
2085 CTCM_FUNTAIL, dev->name);
2086 priv->stats.rx_dropped++;
2087 return -ENOMEM;
2088 }
2089
2090 qllcptr = skb_put(skb, sizeof(struct qllc));
2091 qllcptr->qllc_address = 0xcc;
2092 qllcptr->qllc_commands = 0x03;
2093
2094 if (skb_headroom(skb) < 4) {
2095 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2096 "%s(%s): skb_headroom error",
2097 CTCM_FUNTAIL, dev->name);
2098 dev_kfree_skb_any(skb);
2099 return -ENOMEM;
2100 }
2101
2102 *((__u32 *)skb_push(skb, 4)) =
2103 priv->channel[CTCM_READ]->pdu_seq;
2104 priv->channel[CTCM_READ]->pdu_seq++;
2105 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2106 __func__, priv->channel[CTCM_READ]->pdu_seq);
2107
2108 /* receipt of CC03 resets anticipated sequence number on
2109 receiving side */
2110 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2111 skb_reset_mac_header(skb);
2112 skb->dev = dev;
2113 skb->protocol = htons(ETH_P_SNAP);
2114 skb->ip_summed = CHECKSUM_UNNECESSARY;
2115
2116 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2117
2118 netif_rx(skb);
2119 break;
2120 default:
2121 break;
2122
2123 }
2124
2125 return 0;
2126 }
2127 /* --- This is the END my friend --- */
2128
Kernel DRM miscellaneous fixes and cross-tree changes