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