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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / s390 / net / ctcm_mpc.c
blob2dbc77b5137bacb4e3d283ed6b0eea4fa45c8395
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 #ifdef CONFIG_64BIT
134 char addr[22];
135 #else
136 char addr[12];
137 #endif
138 char boff[12];
139 char bhex[82], duphex[82];
140 char basc[40];
141
142 sw = 0;
143 rptr = ptr = buf;
144 rm = 16;
145 duphex[0] = 0x00;
146 dup = 0;
147
148 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
149 if (sw == 0) {
150 #ifdef CONFIG_64BIT
151 sprintf(addr, "%16.16llx", (__u64)rptr);
152 #else
153 sprintf(addr, "%8.8X", (__u32)rptr);
154 #endif
155
156 sprintf(boff, "%4.4X", (__u32)ct);
157 bhex[0] = '\0';
158 basc[0] = '\0';
159 }
160 if ((sw == 4) || (sw == 12))
161 strcat(bhex, " ");
162 if (sw == 8)
163 strcat(bhex, " ");
164
165 #if CONFIG_64BIT
166 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
167 #else
168 sprintf(tbuf, "%2.2X", (__u32)*ptr);
169 #endif
170
171 tbuf[2] = '\0';
172 strcat(bhex, tbuf);
173 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
174 basc[sw] = *ptr;
175 else
176 basc[sw] = '.';
177
178 basc[sw+1] = '\0';
179 sw++;
180 rm--;
181 if (sw != 16)
182 continue;
183 if ((strcmp(duphex, bhex)) != 0) {
184 if (dup != 0) {
185 sprintf(tdup,
186 "Duplicate as above to %s", addr);
187 ctcm_pr_debug(" --- %s ---\n",
188 tdup);
189 }
190 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
191 addr, boff, bhex, basc);
192 dup = 0;
193 strcpy(duphex, bhex);
194 } else
195 dup++;
196
197 sw = 0;
198 rm = 16;
199 } /* endfor */
200
201 if (sw != 0) {
202 for ( ; rm > 0; rm--, sw++) {
203 if ((sw == 4) || (sw == 12))
204 strcat(bhex, " ");
205 if (sw == 8)
206 strcat(bhex, " ");
207 strcat(bhex, " ");
208 strcat(basc, " ");
209 }
210 if (dup != 0) {
211 sprintf(tdup, "Duplicate as above to %s", addr);
212 ctcm_pr_debug(" --- %s ---\n", tdup);
213 }
214 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
215 addr, boff, bhex, basc);
216 } else {
217 if (dup >= 1) {
218 sprintf(tdup, "Duplicate as above to %s", addr);
219 ctcm_pr_debug(" --- %s ---\n", tdup);
220 }
221 if (dup != 0) {
222 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
223 addr, boff, bhex, basc);
224 }
225 }
226
227 return;
228
229 } /* end of ctcmpc_dumpit */
230 #endif
231
232 #ifdef DEBUGDATA
233 /*
234 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
235 *
236 * skb The sk_buff to dump.
237 * offset Offset relative to skb-data, where to start the dump.
238 */
239 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
240 {
241 __u8 *p = skb->data;
242 struct th_header *header;
243 struct pdu *pheader;
244 int bl = skb->len;
245 int i;
246
247 if (p == NULL)
248 return;
249
250 p += offset;
251 header = (struct th_header *)p;
252
253 ctcm_pr_debug("dump:\n");
254 ctcm_pr_debug("skb len=%d \n", skb->len);
255 if (skb->len > 2) {
256 switch (header->th_ch_flag) {
257 case TH_HAS_PDU:
258 break;
259 case 0x00:
260 case TH_IS_XID:
261 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
262 (header->th_is_xid == 0x01))
263 goto dumpth;
264 case TH_SWEEP_REQ:
265 goto dumpth;
266 case TH_SWEEP_RESP:
267 goto dumpth;
268 default:
269 break;
270 }
271
272 pheader = (struct pdu *)p;
273 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
274 pheader->pdu_offset, pheader->pdu_offset);
275 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
276 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
277 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
278 goto dumpdata;
279
280 dumpth:
281 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
282 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
283 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
284 ctcm_pr_debug("th->type : %s\n",
285 (header->th_is_xid) ? "DATA" : "XID");
286 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
287
288 }
289 dumpdata:
290 if (bl > 32)
291 bl = 32;
292 ctcm_pr_debug("data: ");
293 for (i = 0; i < bl; i++)
294 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
295 ctcm_pr_debug("\n");
296 }
297 #endif
298
299 static struct net_device *ctcmpc_get_dev(int port_num)
300 {
301 char device[20];
302 struct net_device *dev;
303 struct ctcm_priv *priv;
304
305 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
306
307 dev = __dev_get_by_name(&init_net, device);
308
309 if (dev == NULL) {
310 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
311 "%s: Device not found by name: %s",
312 CTCM_FUNTAIL, device);
313 return NULL;
314 }
315 priv = dev->ml_priv;
316 if (priv == NULL) {
317 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
318 "%s(%s): dev->ml_priv is NULL",
319 CTCM_FUNTAIL, device);
320 return NULL;
321 }
322 if (priv->mpcg == NULL) {
323 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
324 "%s(%s): priv->mpcg is NULL",
325 CTCM_FUNTAIL, device);
326 return NULL;
327 }
328 return dev;
329 }
330
331 /*
332 * ctc_mpc_alloc_channel
333 * (exported interface)
334 *
335 * Device Initialization :
336 * ACTPATH driven IO operations
337 */
338 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
339 {
340 struct net_device *dev;
341 struct mpc_group *grp;
342 struct ctcm_priv *priv;
343
344 dev = ctcmpc_get_dev(port_num);
345 if (dev == NULL)
346 return 1;
347 priv = dev->ml_priv;
348 grp = priv->mpcg;
349
350 grp->allochanfunc = callback;
351 grp->port_num = port_num;
352 grp->port_persist = 1;
353
354 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
355 "%s(%s): state=%s",
356 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
357
358 switch (fsm_getstate(grp->fsm)) {
359 case MPCG_STATE_INOP:
360 /* Group is in the process of terminating */
361 grp->alloc_called = 1;
362 break;
363 case MPCG_STATE_RESET:
364 /* MPC Group will transition to state */
365 /* MPCG_STATE_XID2INITW iff the minimum number */
366 /* of 1 read and 1 write channel have successfully*/
367 /* activated */
368 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
369 if (callback)
370 grp->send_qllc_disc = 1;
371 case MPCG_STATE_XID0IOWAIT:
372 fsm_deltimer(&grp->timer);
373 grp->outstanding_xid2 = 0;
374 grp->outstanding_xid7 = 0;
375 grp->outstanding_xid7_p2 = 0;
376 grp->saved_xid2 = NULL;
377 if (callback)
378 ctcm_open(dev);
379 fsm_event(priv->fsm, DEV_EVENT_START, dev);
380 break;
381 case MPCG_STATE_READY:
382 /* XID exchanges completed after PORT was activated */
383 /* Link station already active */
384 /* Maybe timing issue...retry callback */
385 grp->allocchan_callback_retries++;
386 if (grp->allocchan_callback_retries < 4) {
387 if (grp->allochanfunc)
388 grp->allochanfunc(grp->port_num,
389 grp->group_max_buflen);
390 } else {
391 /* there are problems...bail out */
392 /* there may be a state mismatch so restart */
393 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
394 grp->allocchan_callback_retries = 0;
395 }
396 break;
397 }
398
399 return 0;
400 }
401 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
402
403 /*
404 * ctc_mpc_establish_connectivity
405 * (exported interface)
406 */
407 void ctc_mpc_establish_connectivity(int port_num,
408 void (*callback)(int, int, int))
409 {
410 struct net_device *dev;
411 struct mpc_group *grp;
412 struct ctcm_priv *priv;
413 struct channel *rch, *wch;
414
415 dev = ctcmpc_get_dev(port_num);
416 if (dev == NULL)
417 return;
418 priv = dev->ml_priv;
419 grp = priv->mpcg;
420 rch = priv->channel[CTCM_READ];
421 wch = priv->channel[CTCM_WRITE];
422
423 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
424 "%s(%s): state=%s",
425 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
426
427 grp->estconnfunc = callback;
428 grp->port_num = port_num;
429
430 switch (fsm_getstate(grp->fsm)) {
431 case MPCG_STATE_READY:
432 /* XID exchanges completed after PORT was activated */
433 /* Link station already active */
434 /* Maybe timing issue...retry callback */
435 fsm_deltimer(&grp->timer);
436 grp->estconn_callback_retries++;
437 if (grp->estconn_callback_retries < 4) {
438 if (grp->estconnfunc) {
439 grp->estconnfunc(grp->port_num, 0,
440 grp->group_max_buflen);
441 grp->estconnfunc = NULL;
442 }
443 } else {
444 /* there are problems...bail out */
445 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
446 grp->estconn_callback_retries = 0;
447 }
448 break;
449 case MPCG_STATE_INOP:
450 case MPCG_STATE_RESET:
451 /* MPC Group is not ready to start XID - min num of */
452 /* 1 read and 1 write channel have not been acquired*/
453
454 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
455 "%s(%s): REJECTED - inactive channels",
456 CTCM_FUNTAIL, dev->name);
457 if (grp->estconnfunc) {
458 grp->estconnfunc(grp->port_num, -1, 0);
459 grp->estconnfunc = NULL;
460 }
461 break;
462 case MPCG_STATE_XID2INITW:
463 /* alloc channel was called but no XID exchange */
464 /* has occurred. initiate xside XID exchange */
465 /* make sure yside XID0 processing has not started */
466
467 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
468 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
469 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
470 "%s(%s): ABORT - PASSIVE XID",
471 CTCM_FUNTAIL, dev->name);
472 break;
473 }
474 grp->send_qllc_disc = 1;
475 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
476 fsm_deltimer(&grp->timer);
477 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
478 MPCG_EVENT_TIMER, dev);
479 grp->outstanding_xid7 = 0;
480 grp->outstanding_xid7_p2 = 0;
481 grp->saved_xid2 = NULL;
482 if ((rch->in_mpcgroup) &&
483 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
484 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
485 else {
486 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
487 "%s(%s): RX-%s not ready for ACTIVE XID0",
488 CTCM_FUNTAIL, dev->name, rch->id);
489 if (grp->estconnfunc) {
490 grp->estconnfunc(grp->port_num, -1, 0);
491 grp->estconnfunc = NULL;
492 }
493 fsm_deltimer(&grp->timer);
494 goto done;
495 }
496 if ((wch->in_mpcgroup) &&
497 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
498 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
499 else {
500 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
501 "%s(%s): WX-%s not ready for ACTIVE XID0",
502 CTCM_FUNTAIL, dev->name, wch->id);
503 if (grp->estconnfunc) {
504 grp->estconnfunc(grp->port_num, -1, 0);
505 grp->estconnfunc = NULL;
506 }
507 fsm_deltimer(&grp->timer);
508 goto done;
509 }
510 break;
511 case MPCG_STATE_XID0IOWAIT:
512 /* already in active XID negotiations */
513 default:
514 break;
515 }
516
517 done:
518 CTCM_PR_DEBUG("Exit %s()\n", __func__);
519 return;
520 }
521 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
522
523 /*
524 * ctc_mpc_dealloc_ch
525 * (exported interface)
526 */
527 void ctc_mpc_dealloc_ch(int port_num)
528 {
529 struct net_device *dev;
530 struct ctcm_priv *priv;
531 struct mpc_group *grp;
532
533 dev = ctcmpc_get_dev(port_num);
534 if (dev == NULL)
535 return;
536 priv = dev->ml_priv;
537 grp = priv->mpcg;
538
539 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
540 "%s: %s: refcount = %d\n",
541 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
542
543 fsm_deltimer(&priv->restart_timer);
544 grp->channels_terminating = 0;
545 fsm_deltimer(&grp->timer);
546 grp->allochanfunc = NULL;
547 grp->estconnfunc = NULL;
548 grp->port_persist = 0;
549 grp->send_qllc_disc = 0;
550 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
551
552 ctcm_close(dev);
553 return;
554 }
555 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
556
557 /*
558 * ctc_mpc_flow_control
559 * (exported interface)
560 */
561 void ctc_mpc_flow_control(int port_num, int flowc)
562 {
563 struct ctcm_priv *priv;
564 struct mpc_group *grp;
565 struct net_device *dev;
566 struct channel *rch;
567 int mpcg_state;
568
569 dev = ctcmpc_get_dev(port_num);
570 if (dev == NULL)
571 return;
572 priv = dev->ml_priv;
573 grp = priv->mpcg;
574
575 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
576 "%s: %s: flowc = %d",
577 CTCM_FUNTAIL, dev->name, flowc);
578
579 rch = priv->channel[CTCM_READ];
580
581 mpcg_state = fsm_getstate(grp->fsm);
582 switch (flowc) {
583 case 1:
584 if (mpcg_state == MPCG_STATE_FLOWC)
585 break;
586 if (mpcg_state == MPCG_STATE_READY) {
587 if (grp->flow_off_called == 1)
588 grp->flow_off_called = 0;
589 else
590 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
591 break;
592 }
593 break;
594 case 0:
595 if (mpcg_state == MPCG_STATE_FLOWC) {
596 fsm_newstate(grp->fsm, MPCG_STATE_READY);
597 /* ensure any data that has accumulated */
598 /* on the io_queue will now be sen t */
599 tasklet_schedule(&rch->ch_tasklet);
600 }
601 /* possible race condition */
602 if (mpcg_state == MPCG_STATE_READY) {
603 grp->flow_off_called = 1;
604 break;
605 }
606 break;
607 }
608
609 }
610 EXPORT_SYMBOL(ctc_mpc_flow_control);
611
612 static int mpc_send_qllc_discontact(struct net_device *);
613
614 /*
615 * helper function of ctcmpc_unpack_skb
616 */
617 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
618 {
619 struct channel *rch = mpcginfo->ch;
620 struct net_device *dev = rch->netdev;
621 struct ctcm_priv *priv = dev->ml_priv;
622 struct mpc_group *grp = priv->mpcg;
623 struct channel *ch = priv->channel[CTCM_WRITE];
624
625 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
626 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
627
628 grp->sweep_rsp_pend_num--;
629
630 if ((grp->sweep_req_pend_num == 0) &&
631 (grp->sweep_rsp_pend_num == 0)) {
632 fsm_deltimer(&ch->sweep_timer);
633 grp->in_sweep = 0;
634 rch->th_seq_num = 0x00;
635 ch->th_seq_num = 0x00;
636 ctcm_clear_busy_do(dev);
637 }
638
639 kfree(mpcginfo);
640
641 return;
642
643 }
644
645 /*
646 * helper function of mpc_rcvd_sweep_req
647 * which is a helper of ctcmpc_unpack_skb
648 */
649 static void ctcmpc_send_sweep_resp(struct channel *rch)
650 {
651 struct net_device *dev = rch->netdev;
652 struct ctcm_priv *priv = dev->ml_priv;
653 struct mpc_group *grp = priv->mpcg;
654 struct th_sweep *header;
655 struct sk_buff *sweep_skb;
656 struct channel *ch = priv->channel[CTCM_WRITE];
657
658 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
659
660 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
661 if (sweep_skb == NULL) {
662 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
663 "%s(%s): sweep_skb allocation ERROR\n",
664 CTCM_FUNTAIL, rch->id);
665 goto done;
666 }
667
668 header = kmalloc(sizeof(struct th_sweep), gfp_type());
669
670 if (!header) {
671 dev_kfree_skb_any(sweep_skb);
672 goto done;
673 }
674
675 header->th.th_seg = 0x00 ;
676 header->th.th_ch_flag = TH_SWEEP_RESP;
677 header->th.th_blk_flag = 0x00;
678 header->th.th_is_xid = 0x00;
679 header->th.th_seq_num = 0x00;
680 header->sw.th_last_seq = ch->th_seq_num;
681
682 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
683
684 kfree(header);
685
686 dev->trans_start = jiffies;
687 skb_queue_tail(&ch->sweep_queue, sweep_skb);
688
689 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
690
691 return;
692
693 done:
694 grp->in_sweep = 0;
695 ctcm_clear_busy_do(dev);
696 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
697
698 return;
699 }
700
701 /*
702 * helper function of ctcmpc_unpack_skb
703 */
704 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
705 {
706 struct channel *rch = mpcginfo->ch;
707 struct net_device *dev = rch->netdev;
708 struct ctcm_priv *priv = dev->ml_priv;
709 struct mpc_group *grp = priv->mpcg;
710 struct channel *ch = priv->channel[CTCM_WRITE];
711
712 if (do_debug)
713 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
714 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
715
716 if (grp->in_sweep == 0) {
717 grp->in_sweep = 1;
718 ctcm_test_and_set_busy(dev);
719 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
720 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
721 }
722
723 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
724
725 grp->sweep_req_pend_num--;
726 ctcmpc_send_sweep_resp(ch);
727 kfree(mpcginfo);
728 return;
729 }
730
731 /*
732 * MPC Group Station FSM definitions
733 */
734 static const char *mpcg_event_names[] = {
735 [MPCG_EVENT_INOP] = "INOP Condition",
736 [MPCG_EVENT_DISCONC] = "Discontact Received",
737 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
738 [MPCG_EVENT_XID2] = "XID2 Received",
739 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
740 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
741 [MPCG_EVENT_TIMER] = "XID Setup Timer",
742 [MPCG_EVENT_DOIO] = "XID DoIO",
743 };
744
745 static const char *mpcg_state_names[] = {
746 [MPCG_STATE_RESET] = "Reset",
747 [MPCG_STATE_INOP] = "INOP",
748 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
749 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
750 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
751 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
752 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
753 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
754 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
755 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
756 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
757 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
758 [MPCG_STATE_READY] = "READY",
759 };
760
761 /*
762 * The MPC Group Station FSM
763 * 22 events
764 */
765 static const fsm_node mpcg_fsm[] = {
766 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
767 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
768 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
769
770 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
771 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
772
773 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
774 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
775 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
776 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
777 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
778
779 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
780 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
781 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
782 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
783 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
784
785 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
786 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
787 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
788 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
789 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
790 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
791 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
792
793 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
794 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
795 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
796 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
797 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
798 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
799
800 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
801 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
802 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
803 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
804 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
805 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
806
807 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
808 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
809 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
810 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
811 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
812 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
813
814 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
815 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
816 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
817 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
818 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
819 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
820 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
821
822 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
823 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
824 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
825 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
826 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
827 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
828
829 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
830 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
831 };
832
833 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
834
835 /*
836 * MPC Group Station FSM action
837 * CTCM_PROTO_MPC only
838 */
839 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
840 {
841 struct net_device *dev = arg;
842 struct ctcm_priv *priv = dev->ml_priv;
843 struct mpc_group *grp = priv->mpcg;
844
845 if (grp == NULL) {
846 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
847 "%s(%s): No MPC group",
848 CTCM_FUNTAIL, dev->name);
849 return;
850 }
851
852 fsm_deltimer(&grp->timer);
853
854 if (grp->saved_xid2->xid2_flag2 == 0x40) {
855 priv->xid->xid2_flag2 = 0x00;
856 if (grp->estconnfunc) {
857 grp->estconnfunc(grp->port_num, 1,
858 grp->group_max_buflen);
859 grp->estconnfunc = NULL;
860 } else if (grp->allochanfunc)
861 grp->send_qllc_disc = 1;
862
863 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
864 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
865 "%s(%s): fails",
866 CTCM_FUNTAIL, dev->name);
867 return;
868 }
869
870 grp->port_persist = 1;
871 grp->out_of_sequence = 0;
872 grp->estconn_called = 0;
873
874 tasklet_hi_schedule(&grp->mpc_tasklet2);
875
876 return;
877 }
878
879 /*
880 * helper of ctcm_init_netdevice
881 * CTCM_PROTO_MPC only
882 */
883 void mpc_group_ready(unsigned long adev)
884 {
885 struct net_device *dev = (struct net_device *)adev;
886 struct ctcm_priv *priv = dev->ml_priv;
887 struct mpc_group *grp = priv->mpcg;
888 struct channel *ch = NULL;
889
890 if (grp == NULL) {
891 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
892 "%s(%s): No MPC group",
893 CTCM_FUNTAIL, dev->name);
894 return;
895 }
896
897 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
898 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
899 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
900
901 fsm_newstate(grp->fsm, MPCG_STATE_READY);
902
903 /* Put up a read on the channel */
904 ch = priv->channel[CTCM_READ];
905 ch->pdu_seq = 0;
906 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
907 __func__, ch->pdu_seq);
908
909 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
910 /* Put the write channel in idle state */
911 ch = priv->channel[CTCM_WRITE];
912 if (ch->collect_len > 0) {
913 spin_lock(&ch->collect_lock);
914 ctcm_purge_skb_queue(&ch->collect_queue);
915 ch->collect_len = 0;
916 spin_unlock(&ch->collect_lock);
917 }
918 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
919 ctcm_clear_busy(dev);
920
921 if (grp->estconnfunc) {
922 grp->estconnfunc(grp->port_num, 0,
923 grp->group_max_buflen);
924 grp->estconnfunc = NULL;
925 } else if (grp->allochanfunc)
926 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
927
928 grp->send_qllc_disc = 1;
929 grp->changed_side = 0;
930
931 return;
932
933 }
934
935 /*
936 * Increment the MPC Group Active Channel Counts
937 * helper of dev_action (called from channel fsm)
938 */
939 void mpc_channel_action(struct channel *ch, int direction, int action)
940 {
941 struct net_device *dev = ch->netdev;
942 struct ctcm_priv *priv = dev->ml_priv;
943 struct mpc_group *grp = priv->mpcg;
944
945 if (grp == NULL) {
946 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
947 "%s(%s): No MPC group",
948 CTCM_FUNTAIL, dev->name);
949 return;
950 }
951
952 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
953
954 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
955 "%s: %i / Grp:%s total_channels=%i, active_channels: "
956 "read=%i, write=%i\n", __func__, action,
957 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
958 grp->active_channels[CTCM_READ],
959 grp->active_channels[CTCM_WRITE]);
960
961 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
962 grp->num_channel_paths++;
963 grp->active_channels[direction]++;
964 grp->outstanding_xid2++;
965 ch->in_mpcgroup = 1;
966
967 if (ch->xid_skb != NULL)
968 dev_kfree_skb_any(ch->xid_skb);
969
970 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
971 GFP_ATOMIC | GFP_DMA);
972 if (ch->xid_skb == NULL) {
973 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
974 "%s(%s): Couldn't alloc ch xid_skb\n",
975 CTCM_FUNTAIL, dev->name);
976 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
977 return;
978 }
979 ch->xid_skb_data = ch->xid_skb->data;
980 ch->xid_th = (struct th_header *)ch->xid_skb->data;
981 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
982 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
983 skb_put(ch->xid_skb, XID2_LENGTH);
984 ch->xid_id = skb_tail_pointer(ch->xid_skb);
985 ch->xid_skb->data = ch->xid_skb_data;
986 skb_reset_tail_pointer(ch->xid_skb);
987 ch->xid_skb->len = 0;
988
989 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
990 grp->xid_skb->data,
991 grp->xid_skb->len);
992
993 ch->xid->xid2_dlc_type =
994 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
995 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
996
997 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
998 ch->xid->xid2_buf_len = 0x00;
999
1000 ch->xid_skb->data = ch->xid_skb_data;
1001 skb_reset_tail_pointer(ch->xid_skb);
1002 ch->xid_skb->len = 0;
1003
1004 fsm_newstate(ch->fsm, CH_XID0_PENDING);
1005
1006 if ((grp->active_channels[CTCM_READ] > 0) &&
1007 (grp->active_channels[CTCM_WRITE] > 0) &&
1008 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
1009 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1010 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1011 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1012 __func__, dev->name);
1013 }
1014 } else if ((action == MPC_CHANNEL_REMOVE) &&
1015 (ch->in_mpcgroup == 1)) {
1016 ch->in_mpcgroup = 0;
1017 grp->num_channel_paths--;
1018 grp->active_channels[direction]--;
1019
1020 if (ch->xid_skb != NULL)
1021 dev_kfree_skb_any(ch->xid_skb);
1022 ch->xid_skb = NULL;
1023
1024 if (grp->channels_terminating)
1025 goto done;
1026
1027 if (((grp->active_channels[CTCM_READ] == 0) &&
1028 (grp->active_channels[CTCM_WRITE] > 0))
1029 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1030 (grp->active_channels[CTCM_READ] > 0)))
1031 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1032 }
1033 done:
1034 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1035 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1036 "read=%i, write=%i\n", __func__, action,
1037 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1038 grp->active_channels[CTCM_READ],
1039 grp->active_channels[CTCM_WRITE]);
1040
1041 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1042 }
1043
1044 /**
1045 * Unpack a just received skb and hand it over to
1046 * upper layers.
1047 * special MPC version of unpack_skb.
1048 *
1049 * ch The channel where this skb has been received.
1050 * pskb The received skb.
1051 */
1052 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1053 {
1054 struct net_device *dev = ch->netdev;
1055 struct ctcm_priv *priv = dev->ml_priv;
1056 struct mpc_group *grp = priv->mpcg;
1057 struct pdu *curr_pdu;
1058 struct mpcg_info *mpcginfo;
1059 struct th_header *header = NULL;
1060 struct th_sweep *sweep = NULL;
1061 int pdu_last_seen = 0;
1062 __u32 new_len;
1063 struct sk_buff *skb;
1064 int skblen;
1065 int sendrc = 0;
1066
1067 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1068 __func__, dev->name, smp_processor_id(), ch->id);
1069
1070 header = (struct th_header *)pskb->data;
1071 if ((header->th_seg == 0) &&
1072 (header->th_ch_flag == 0) &&
1073 (header->th_blk_flag == 0) &&
1074 (header->th_seq_num == 0))
1075 /* nothing for us */ goto done;
1076
1077 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1078 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1079 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1080
1081 pskb->dev = dev;
1082 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1083 skb_pull(pskb, TH_HEADER_LENGTH);
1084
1085 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1086 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1087 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1088 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1089 (header->th_seq_num != ch->th_seq_num + 1) &&
1090 (ch->th_seq_num != 0))) {
1091 /* This is NOT the next segment *
1092 * we are not the correct race winner *
1093 * go away and let someone else win *
1094 * BUT..this only applies if xid negot *
1095 * is done *
1096 */
1097 grp->out_of_sequence += 1;
1098 __skb_push(pskb, TH_HEADER_LENGTH);
1099 skb_queue_tail(&ch->io_queue, pskb);
1100 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1101 "got:%08x\n", __func__,
1102 ch->th_seq_num + 1, header->th_seq_num);
1103
1104 return;
1105 }
1106 grp->out_of_sequence = 0;
1107 ch->th_seq_num = header->th_seq_num;
1108
1109 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1110 __func__, ch->th_seq_num);
1111
1112 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1113 goto done;
1114 while ((pskb->len > 0) && !pdu_last_seen) {
1115 curr_pdu = (struct pdu *)pskb->data;
1116
1117 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1118 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1119 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1120 __func__, pskb->len);
1121
1122 skb_pull(pskb, PDU_HEADER_LENGTH);
1123
1124 if (curr_pdu->pdu_flag & PDU_LAST)
1125 pdu_last_seen = 1;
1126 if (curr_pdu->pdu_flag & PDU_CNTL)
1127 pskb->protocol = htons(ETH_P_SNAP);
1128 else
1129 pskb->protocol = htons(ETH_P_SNA_DIX);
1130
1131 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1132 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1133 "%s(%s): Dropping packet with "
1134 "illegal siize %d",
1135 CTCM_FUNTAIL, dev->name, pskb->len);
1136
1137 priv->stats.rx_dropped++;
1138 priv->stats.rx_length_errors++;
1139 goto done;
1140 }
1141 skb_reset_mac_header(pskb);
1142 new_len = curr_pdu->pdu_offset;
1143 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1144 __func__, new_len);
1145 if ((new_len == 0) || (new_len > pskb->len)) {
1146 /* should never happen */
1147 /* pskb len must be hosed...bail out */
1148 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1149 "%s(%s): non valid pdu_offset: %04x",
1150 /* "data may be lost", */
1151 CTCM_FUNTAIL, dev->name, new_len);
1152 goto done;
1153 }
1154 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1155
1156 if (!skb) {
1157 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1158 "%s(%s): MEMORY allocation error",
1159 CTCM_FUNTAIL, dev->name);
1160 priv->stats.rx_dropped++;
1161 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1162 goto done;
1163 }
1164 memcpy(skb_put(skb, new_len), pskb->data, new_len);
1165
1166 skb_reset_mac_header(skb);
1167 skb->dev = pskb->dev;
1168 skb->protocol = pskb->protocol;
1169 skb->ip_summed = CHECKSUM_UNNECESSARY;
1170 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1171 ch->pdu_seq++;
1172
1173 if (do_debug_data) {
1174 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1175 __func__, ch->pdu_seq);
1176 ctcm_pr_debug("%s: skb:%0lx "
1177 "skb len: %d \n", __func__,
1178 (unsigned long)skb, skb->len);
1179 ctcm_pr_debug("%s: up to 32 bytes "
1180 "of pdu_data sent\n", __func__);
1181 ctcmpc_dump32((char *)skb->data, skb->len);
1182 }
1183
1184 skblen = skb->len;
1185 sendrc = netif_rx(skb);
1186 priv->stats.rx_packets++;
1187 priv->stats.rx_bytes += skblen;
1188 skb_pull(pskb, new_len); /* point to next PDU */
1189 }
1190 } else {
1191 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1192 if (mpcginfo == NULL)
1193 goto done;
1194
1195 mpcginfo->ch = ch;
1196 mpcginfo->th = header;
1197 mpcginfo->skb = pskb;
1198 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1199 __func__);
1200 /* it's a sweep? */
1201 sweep = (struct th_sweep *)pskb->data;
1202 mpcginfo->sweep = sweep;
1203 if (header->th_ch_flag == TH_SWEEP_REQ)
1204 mpc_rcvd_sweep_req(mpcginfo);
1205 else if (header->th_ch_flag == TH_SWEEP_RESP)
1206 mpc_rcvd_sweep_resp(mpcginfo);
1207 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1208 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1209 skb_pull(pskb, XID2_LENGTH);
1210 mpcginfo->xid = thisxid;
1211 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1212 } else if (header->th_blk_flag == TH_DISCONTACT)
1213 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1214 else if (header->th_seq_num != 0) {
1215 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1216 "%s(%s): control pkt expected\n",
1217 CTCM_FUNTAIL, dev->name);
1218 priv->stats.rx_dropped++;
1219 /* mpcginfo only used for non-data transfers */
1220 kfree(mpcginfo);
1221 if (do_debug_data)
1222 ctcmpc_dump_skb(pskb, -8);
1223 }
1224 }
1225 done:
1226
1227 dev_kfree_skb_any(pskb);
1228 if (sendrc == NET_RX_DROP) {
1229 dev_warn(&dev->dev,
1230 "The network backlog for %s is exceeded, "
1231 "package dropped\n", __func__);
1232 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1233 }
1234
1235 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1236 __func__, dev->name, ch, ch->id);
1237 }
1238
1239 /**
1240 * tasklet helper for mpc's skb unpacking.
1241 *
1242 * ch The channel to work on.
1243 * Allow flow control back pressure to occur here.
1244 * Throttling back channel can result in excessive
1245 * channel inactivity and system deact of channel
1246 */
1247 void ctcmpc_bh(unsigned long thischan)
1248 {
1249 struct channel *ch = (struct channel *)thischan;
1250 struct sk_buff *skb;
1251 struct net_device *dev = ch->netdev;
1252 struct ctcm_priv *priv = dev->ml_priv;
1253 struct mpc_group *grp = priv->mpcg;
1254
1255 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1256 dev->name, smp_processor_id(), __func__, ch->id);
1257 /* caller has requested driver to throttle back */
1258 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1259 (skb = skb_dequeue(&ch->io_queue))) {
1260 ctcmpc_unpack_skb(ch, skb);
1261 if (grp->out_of_sequence > 20) {
1262 /* assume data loss has occurred if */
1263 /* missing seq_num for extended */
1264 /* period of time */
1265 grp->out_of_sequence = 0;
1266 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1267 break;
1268 }
1269 if (skb == skb_peek(&ch->io_queue))
1270 break;
1271 }
1272 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1273 __func__, dev->name, ch, ch->id);
1274 return;
1275 }
1276
1277 /*
1278 * MPC Group Initializations
1279 */
1280 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1281 {
1282 struct mpc_group *grp;
1283
1284 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1285 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1286
1287 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1288 if (grp == NULL)
1289 return NULL;
1290
1291 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1292 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1293 mpcg_fsm_len, GFP_KERNEL);
1294 if (grp->fsm == NULL) {
1295 kfree(grp);
1296 return NULL;
1297 }
1298
1299 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1300 fsm_settimer(grp->fsm, &grp->timer);
1301
1302 grp->xid_skb =
1303 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1304 if (grp->xid_skb == NULL) {
1305 kfree_fsm(grp->fsm);
1306 kfree(grp);
1307 return NULL;
1308 }
1309 /* base xid for all channels in group */
1310 grp->xid_skb_data = grp->xid_skb->data;
1311 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1312 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1313 &thnorm, TH_HEADER_LENGTH);
1314
1315 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1316 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1317 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1318 grp->xid->xid2_sender_id = jiffies;
1319
1320 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1321 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1322
1323 grp->rcvd_xid_skb =
1324 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1325 if (grp->rcvd_xid_skb == NULL) {
1326 kfree_fsm(grp->fsm);
1327 dev_kfree_skb(grp->xid_skb);
1328 kfree(grp);
1329 return NULL;
1330 }
1331 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1332 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1333 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1334 &thnorm, TH_HEADER_LENGTH);
1335 grp->saved_xid2 = NULL;
1336 priv->xid = grp->xid;
1337 priv->mpcg = grp;
1338 return grp;
1339 }
1340
1341 /*
1342 * The MPC Group Station FSM
1343 */
1344
1345 /*
1346 * MPC Group Station FSM actions
1347 * CTCM_PROTO_MPC only
1348 */
1349
1350 /**
1351 * NOP action for statemachines
1352 */
1353 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1354 {
1355 }
1356
1357 /*
1358 * invoked when the device transitions to dev_stopped
1359 * MPC will stop each individual channel if a single XID failure
1360 * occurs, or will intitiate all channels be stopped if a GROUP
1361 * level failure occurs.
1362 */
1363 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1364 {
1365 struct net_device *dev = arg;
1366 struct ctcm_priv *priv;
1367 struct mpc_group *grp;
1368 struct channel *wch;
1369
1370 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1371
1372 priv = dev->ml_priv;
1373 grp = priv->mpcg;
1374 grp->flow_off_called = 0;
1375 fsm_deltimer(&grp->timer);
1376 if (grp->channels_terminating)
1377 return;
1378
1379 grp->channels_terminating = 1;
1380 grp->saved_state = fsm_getstate(grp->fsm);
1381 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1382 if (grp->saved_state > MPCG_STATE_XID7INITF)
1383 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1384 "%s(%s): MPC GROUP INOPERATIVE",
1385 CTCM_FUNTAIL, dev->name);
1386 if ((grp->saved_state != MPCG_STATE_RESET) ||
1387 /* dealloc_channel has been called */
1388 (grp->port_persist == 0))
1389 fsm_deltimer(&priv->restart_timer);
1390
1391 wch = priv->channel[CTCM_WRITE];
1392
1393 switch (grp->saved_state) {
1394 case MPCG_STATE_RESET:
1395 case MPCG_STATE_INOP:
1396 case MPCG_STATE_XID2INITW:
1397 case MPCG_STATE_XID0IOWAIT:
1398 case MPCG_STATE_XID2INITX:
1399 case MPCG_STATE_XID7INITW:
1400 case MPCG_STATE_XID7INITX:
1401 case MPCG_STATE_XID0IOWAIX:
1402 case MPCG_STATE_XID7INITI:
1403 case MPCG_STATE_XID7INITZ:
1404 case MPCG_STATE_XID7INITF:
1405 break;
1406 case MPCG_STATE_FLOWC:
1407 case MPCG_STATE_READY:
1408 default:
1409 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1410 }
1411
1412 grp->xid2_tgnum = 0;
1413 grp->group_max_buflen = 0; /*min of all received */
1414 grp->outstanding_xid2 = 0;
1415 grp->outstanding_xid7 = 0;
1416 grp->outstanding_xid7_p2 = 0;
1417 grp->saved_xid2 = NULL;
1418 grp->xidnogood = 0;
1419 grp->changed_side = 0;
1420
1421 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1422 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1423 grp->rcvd_xid_skb->len = 0;
1424 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1425 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1426 TH_HEADER_LENGTH);
1427
1428 if (grp->send_qllc_disc == 1) {
1429 grp->send_qllc_disc = 0;
1430 mpc_send_qllc_discontact(dev);
1431 }
1432
1433 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1434 /* This can result in INOP of VTAM PU due to halting of */
1435 /* outstanding IO which causes a sense to be returned */
1436 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1437 /* become unreachable without manual intervention */
1438 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1439 grp->alloc_called = 0;
1440 fsm_deltimer(&priv->restart_timer);
1441 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1442 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1443 if (grp->saved_state > MPCG_STATE_XID7INITF)
1444 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1445 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1446 CTCM_FUNTAIL, dev->name);
1447 } else {
1448 fsm_deltimer(&priv->restart_timer);
1449 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1450 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1451 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1452 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1453 CTCM_FUNTAIL, dev->name);
1454 }
1455 }
1456
1457 /**
1458 * Handle mpc group action timeout.
1459 * MPC Group Station FSM action
1460 * CTCM_PROTO_MPC only
1461 *
1462 * fi An instance of an mpc_group fsm.
1463 * event The event, just happened.
1464 * arg Generic pointer, casted from net_device * upon call.
1465 */
1466 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1467 {
1468 struct net_device *dev = arg;
1469 struct ctcm_priv *priv;
1470 struct mpc_group *grp;
1471 struct channel *wch;
1472 struct channel *rch;
1473
1474 priv = dev->ml_priv;
1475 grp = priv->mpcg;
1476 wch = priv->channel[CTCM_WRITE];
1477 rch = priv->channel[CTCM_READ];
1478
1479 switch (fsm_getstate(grp->fsm)) {
1480 case MPCG_STATE_XID2INITW:
1481 /* Unless there is outstanding IO on the */
1482 /* channel just return and wait for ATTN */
1483 /* interrupt to begin XID negotiations */
1484 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1485 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1486 break;
1487 default:
1488 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1489 }
1490
1491 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1492 "%s: dev=%s exit",
1493 CTCM_FUNTAIL, dev->name);
1494 return;
1495 }
1496
1497 /*
1498 * MPC Group Station FSM action
1499 * CTCM_PROTO_MPC only
1500 */
1501 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1502 {
1503 struct mpcg_info *mpcginfo = arg;
1504 struct channel *ch = mpcginfo->ch;
1505 struct net_device *dev;
1506 struct ctcm_priv *priv;
1507 struct mpc_group *grp;
1508
1509 if (ch) {
1510 dev = ch->netdev;
1511 if (dev) {
1512 priv = dev->ml_priv;
1513 if (priv) {
1514 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1515 "%s: %s: %s\n",
1516 CTCM_FUNTAIL, dev->name, ch->id);
1517 grp = priv->mpcg;
1518 grp->send_qllc_disc = 1;
1519 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1520 }
1521 }
1522 }
1523
1524 return;
1525 }
1526
1527 /*
1528 * MPC Group Station - not part of FSM
1529 * CTCM_PROTO_MPC only
1530 * called from add_channel in ctcm_main.c
1531 */
1532 void mpc_action_send_discontact(unsigned long thischan)
1533 {
1534 int rc;
1535 struct channel *ch = (struct channel *)thischan;
1536 unsigned long saveflags = 0;
1537
1538 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1539 rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1540 (unsigned long)ch, 0xff, 0);
1541 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1542
1543 if (rc != 0) {
1544 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1545 }
1546
1547 return;
1548 }
1549
1550
1551 /*
1552 * helper function of mpc FSM
1553 * CTCM_PROTO_MPC only
1554 * mpc_action_rcvd_xid7
1555 */
1556 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1557 {
1558 struct channel *ch = mpcginfo->ch;
1559 struct net_device *dev = ch->netdev;
1560 struct ctcm_priv *priv = dev->ml_priv;
1561 struct mpc_group *grp = priv->mpcg;
1562 struct xid2 *xid = mpcginfo->xid;
1563 int rc = 0;
1564 __u64 our_id = 0;
1565 __u64 their_id = 0;
1566 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1567
1568 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1569
1570 if (xid == NULL) {
1571 rc = 1;
1572 /* XID REJECTED: xid == NULL */
1573 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1574 "%s(%s): xid = NULL",
1575 CTCM_FUNTAIL, ch->id);
1576 goto done;
1577 }
1578
1579 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1580
1581 /*the received direction should be the opposite of ours */
1582 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1583 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1584 rc = 2;
1585 /* XID REJECTED: r/w channel pairing mismatch */
1586 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1587 "%s(%s): r/w channel pairing mismatch",
1588 CTCM_FUNTAIL, ch->id);
1589 goto done;
1590 }
1591
1592 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1593 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1594 grp->group_max_buflen, xid->xid2_buf_len);
1595
1596 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1597 xid->xid2_buf_len - len)
1598 grp->group_max_buflen = xid->xid2_buf_len - len;
1599 }
1600
1601 if (grp->saved_xid2 == NULL) {
1602 grp->saved_xid2 =
1603 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1604
1605 memcpy(skb_put(grp->rcvd_xid_skb,
1606 XID2_LENGTH), xid, XID2_LENGTH);
1607 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1608
1609 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1610 grp->rcvd_xid_skb->len = 0;
1611
1612 /* convert two 32 bit numbers into 1 64 bit for id compare */
1613 our_id = (__u64)priv->xid->xid2_adj_id;
1614 our_id = our_id << 32;
1615 our_id = our_id + priv->xid->xid2_sender_id;
1616 their_id = (__u64)xid->xid2_adj_id;
1617 their_id = their_id << 32;
1618 their_id = their_id + xid->xid2_sender_id;
1619 /* lower id assume the xside role */
1620 if (our_id < their_id) {
1621 grp->roll = XSIDE;
1622 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1623 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1624 CTCM_FUNTAIL, ch->id);
1625 } else {
1626 grp->roll = YSIDE;
1627 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1628 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1629 CTCM_FUNTAIL, ch->id);
1630 }
1631
1632 } else {
1633 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1634 rc = 3;
1635 /* XID REJECTED: xid flag byte4 mismatch */
1636 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1637 "%s(%s): xid flag byte4 mismatch",
1638 CTCM_FUNTAIL, ch->id);
1639 }
1640 if (xid->xid2_flag2 == 0x40) {
1641 rc = 4;
1642 /* XID REJECTED - xid NOGOOD */
1643 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1644 "%s(%s): xid NOGOOD",
1645 CTCM_FUNTAIL, ch->id);
1646 }
1647 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1648 rc = 5;
1649 /* XID REJECTED - Adjacent Station ID Mismatch */
1650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1651 "%s(%s): Adjacent Station ID Mismatch",
1652 CTCM_FUNTAIL, ch->id);
1653 }
1654 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1655 rc = 6;
1656 /* XID REJECTED - Sender Address Mismatch */
1657 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1658 "%s(%s): Sender Address Mismatch",
1659 CTCM_FUNTAIL, ch->id);
1660 }
1661 }
1662 done:
1663 if (rc) {
1664 dev_warn(&dev->dev,
1665 "The XID used in the MPC protocol is not valid, "
1666 "rc = %d\n", rc);
1667 priv->xid->xid2_flag2 = 0x40;
1668 grp->saved_xid2->xid2_flag2 = 0x40;
1669 }
1670
1671 return rc;
1672 }
1673
1674 /*
1675 * MPC Group Station FSM action
1676 * CTCM_PROTO_MPC only
1677 */
1678 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1679 {
1680 struct channel *ch = arg;
1681 int rc = 0;
1682 int gotlock = 0;
1683 unsigned long saveflags = 0; /* avoids compiler warning with
1684 spin_unlock_irqrestore */
1685
1686 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1687 __func__, smp_processor_id(), ch, ch->id);
1688
1689 if (ctcm_checkalloc_buffer(ch))
1690 goto done;
1691
1692 /*
1693 * skb data-buffer referencing:
1694 */
1695 ch->trans_skb->data = ch->trans_skb_data;
1696 skb_reset_tail_pointer(ch->trans_skb);
1697 ch->trans_skb->len = 0;
1698 /* result of the previous 3 statements is NOT always
1699 * already set after ctcm_checkalloc_buffer
1700 * because of possible reuse of the trans_skb
1701 */
1702 memset(ch->trans_skb->data, 0, 16);
1703 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1704 /* check is main purpose here: */
1705 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1706 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1707 /* check is main purpose here: */
1708 skb_put(ch->trans_skb, XID2_LENGTH);
1709 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1710 /* cleanup back to startpoint */
1711 ch->trans_skb->data = ch->trans_skb_data;
1712 skb_reset_tail_pointer(ch->trans_skb);
1713 ch->trans_skb->len = 0;
1714
1715 /* non-checking rewrite of above skb data-buffer referencing: */
1716 /*
1717 memset(ch->trans_skb->data, 0, 16);
1718 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1719 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1720 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1721 */
1722
1723 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1724 ch->ccw[8].count = 0;
1725 ch->ccw[8].cda = 0x00;
1726
1727 if (!(ch->xid_th && ch->xid && ch->xid_id))
1728 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1729 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1730 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1731
1732 if (side == XSIDE) {
1733 /* mpc_action_xside_xid */
1734 if (ch->xid_th == NULL)
1735 goto done;
1736 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1737 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1738 ch->ccw[9].count = TH_HEADER_LENGTH;
1739 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1740
1741 if (ch->xid == NULL)
1742 goto done;
1743 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1744 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1745 ch->ccw[10].count = XID2_LENGTH;
1746 ch->ccw[10].cda = virt_to_phys(ch->xid);
1747
1748 ch->ccw[11].cmd_code = CCW_CMD_READ;
1749 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1750 ch->ccw[11].count = TH_HEADER_LENGTH;
1751 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1752
1753 ch->ccw[12].cmd_code = CCW_CMD_READ;
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_phys(ch->rcvd_xid);
1757
1758 ch->ccw[13].cmd_code = CCW_CMD_READ;
1759 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1760
1761 } else { /* side == YSIDE : mpc_action_yside_xid */
1762 ch->ccw[9].cmd_code = CCW_CMD_READ;
1763 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1764 ch->ccw[9].count = TH_HEADER_LENGTH;
1765 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1766
1767 ch->ccw[10].cmd_code = CCW_CMD_READ;
1768 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1769 ch->ccw[10].count = XID2_LENGTH;
1770 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1771
1772 if (ch->xid_th == NULL)
1773 goto done;
1774 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1775 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1776 ch->ccw[11].count = TH_HEADER_LENGTH;
1777 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1778
1779 if (ch->xid == NULL)
1780 goto done;
1781 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1782 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1783 ch->ccw[12].count = XID2_LENGTH;
1784 ch->ccw[12].cda = virt_to_phys(ch->xid);
1785
1786 if (ch->xid_id == NULL)
1787 goto done;
1788 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1789 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1790
1791 }
1792 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1793 ch->ccw[13].count = 4;
1794
1795 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1796 ch->ccw[14].flags = CCW_FLAG_SLI;
1797 ch->ccw[14].count = 0;
1798 ch->ccw[14].cda = 0;
1799
1800 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1801 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1802 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1803 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1804
1805 if (!in_irq()) {
1806 /* Such conditional locking is a known problem for
1807 * sparse because its static undeterministic.
1808 * Warnings should be ignored here. */
1809 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1810 gotlock = 1;
1811 }
1812
1813 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1814 rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1815 (unsigned long)ch, 0xff, 0);
1816
1817 if (gotlock) /* see remark above about conditional locking */
1818 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1819
1820 if (rc != 0) {
1821 ctcm_ccw_check_rc(ch, rc,
1822 (side == XSIDE) ? "x-side XID" : "y-side XID");
1823 }
1824
1825 done:
1826 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1827 __func__, ch, ch->id);
1828 return;
1829
1830 }
1831
1832 /*
1833 * MPC Group Station FSM action
1834 * CTCM_PROTO_MPC only
1835 */
1836 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1837 {
1838 mpc_action_side_xid(fsm, arg, XSIDE);
1839 }
1840
1841 /*
1842 * MPC Group Station FSM action
1843 * CTCM_PROTO_MPC only
1844 */
1845 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1846 {
1847 mpc_action_side_xid(fsm, arg, YSIDE);
1848 }
1849
1850 /*
1851 * MPC Group Station FSM action
1852 * CTCM_PROTO_MPC only
1853 */
1854 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1855 {
1856 struct channel *ch = arg;
1857 struct net_device *dev = ch->netdev;
1858 struct ctcm_priv *priv = dev->ml_priv;
1859 struct mpc_group *grp = priv->mpcg;
1860
1861 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1862 __func__, smp_processor_id(), ch, ch->id);
1863
1864 if (ch->xid == NULL) {
1865 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1866 "%s(%s): ch->xid == NULL",
1867 CTCM_FUNTAIL, dev->name);
1868 return;
1869 }
1870
1871 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1872
1873 ch->xid->xid2_option = XID2_0;
1874
1875 switch (fsm_getstate(grp->fsm)) {
1876 case MPCG_STATE_XID2INITW:
1877 case MPCG_STATE_XID2INITX:
1878 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1879 break;
1880 case MPCG_STATE_XID0IOWAIT:
1881 case MPCG_STATE_XID0IOWAIX:
1882 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1883 break;
1884 }
1885
1886 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1887
1888 return;
1889 }
1890
1891 /*
1892 * MPC Group Station FSM action
1893 * CTCM_PROTO_MPC only
1894 */
1895 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1896 {
1897 struct net_device *dev = arg;
1898 struct ctcm_priv *priv = dev->ml_priv;
1899 struct mpc_group *grp = NULL;
1900 int direction;
1901 int send = 0;
1902
1903 if (priv)
1904 grp = priv->mpcg;
1905 if (grp == NULL)
1906 return;
1907
1908 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1909 struct channel *ch = priv->channel[direction];
1910 struct xid2 *thisxid = ch->xid;
1911 ch->xid_skb->data = ch->xid_skb_data;
1912 skb_reset_tail_pointer(ch->xid_skb);
1913 ch->xid_skb->len = 0;
1914 thisxid->xid2_option = XID2_7;
1915 send = 0;
1916
1917 /* xid7 phase 1 */
1918 if (grp->outstanding_xid7_p2 > 0) {
1919 if (grp->roll == YSIDE) {
1920 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1921 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1922 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1923 memcpy(skb_put(ch->xid_skb,
1924 TH_HEADER_LENGTH),
1925 &thdummy, TH_HEADER_LENGTH);
1926 send = 1;
1927 }
1928 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1929 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1930 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1931 memcpy(skb_put(ch->xid_skb,
1932 TH_HEADER_LENGTH),
1933 &thnorm, TH_HEADER_LENGTH);
1934 send = 1;
1935 }
1936 } else {
1937 /* xid7 phase 2 */
1938 if (grp->roll == YSIDE) {
1939 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1940 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1941 memcpy(skb_put(ch->xid_skb,
1942 TH_HEADER_LENGTH),
1943 &thnorm, TH_HEADER_LENGTH);
1944 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1945 send = 1;
1946 }
1947 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1948 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1949 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1950 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1951 &thdummy, TH_HEADER_LENGTH);
1952 send = 1;
1953 }
1954 }
1955
1956 if (send)
1957 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1958 }
1959
1960 return;
1961 }
1962
1963 /*
1964 * MPC Group Station FSM action
1965 * CTCM_PROTO_MPC only
1966 */
1967 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1968 {
1969
1970 struct mpcg_info *mpcginfo = arg;
1971 struct channel *ch = mpcginfo->ch;
1972 struct net_device *dev = ch->netdev;
1973 struct ctcm_priv *priv = dev->ml_priv;
1974 struct mpc_group *grp = priv->mpcg;
1975
1976 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1977 __func__, ch->id, grp->outstanding_xid2,
1978 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1979
1980 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1981 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1982
1983 grp->outstanding_xid2--;
1984 grp->outstanding_xid7++;
1985 grp->outstanding_xid7_p2++;
1986
1987 /* must change state before validating xid to */
1988 /* properly handle interim interrupts received*/
1989 switch (fsm_getstate(grp->fsm)) {
1990 case MPCG_STATE_XID2INITW:
1991 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1992 mpc_validate_xid(mpcginfo);
1993 break;
1994 case MPCG_STATE_XID0IOWAIT:
1995 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1996 mpc_validate_xid(mpcginfo);
1997 break;
1998 case MPCG_STATE_XID2INITX:
1999 if (grp->outstanding_xid2 == 0) {
2000 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
2001 mpc_validate_xid(mpcginfo);
2002 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2003 }
2004 break;
2005 case MPCG_STATE_XID0IOWAIX:
2006 if (grp->outstanding_xid2 == 0) {
2007 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
2008 mpc_validate_xid(mpcginfo);
2009 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2010 }
2011 break;
2012 }
2013 kfree(mpcginfo);
2014
2015 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2016 __func__, ch->id, grp->outstanding_xid2,
2017 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2018 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2019 __func__, ch->id,
2020 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2021 return;
2022
2023 }
2024
2025
2026 /*
2027 * MPC Group Station FSM action
2028 * CTCM_PROTO_MPC only
2029 */
2030 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2031 {
2032 struct mpcg_info *mpcginfo = arg;
2033 struct channel *ch = mpcginfo->ch;
2034 struct net_device *dev = ch->netdev;
2035 struct ctcm_priv *priv = dev->ml_priv;
2036 struct mpc_group *grp = priv->mpcg;
2037
2038 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2039 __func__, smp_processor_id(), ch, ch->id);
2040 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2041 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2042
2043 grp->outstanding_xid7--;
2044 ch->xid_skb->data = ch->xid_skb_data;
2045 skb_reset_tail_pointer(ch->xid_skb);
2046 ch->xid_skb->len = 0;
2047
2048 switch (fsm_getstate(grp->fsm)) {
2049 case MPCG_STATE_XID7INITI:
2050 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2051 mpc_validate_xid(mpcginfo);
2052 break;
2053 case MPCG_STATE_XID7INITW:
2054 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2055 mpc_validate_xid(mpcginfo);
2056 break;
2057 case MPCG_STATE_XID7INITZ:
2058 case MPCG_STATE_XID7INITX:
2059 if (grp->outstanding_xid7 == 0) {
2060 if (grp->outstanding_xid7_p2 > 0) {
2061 grp->outstanding_xid7 =
2062 grp->outstanding_xid7_p2;
2063 grp->outstanding_xid7_p2 = 0;
2064 } else
2065 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2066
2067 mpc_validate_xid(mpcginfo);
2068 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2069 break;
2070 }
2071 mpc_validate_xid(mpcginfo);
2072 break;
2073 }
2074 kfree(mpcginfo);
2075 return;
2076 }
2077
2078 /*
2079 * mpc_action helper of an MPC Group Station FSM action
2080 * CTCM_PROTO_MPC only
2081 */
2082 static int mpc_send_qllc_discontact(struct net_device *dev)
2083 {
2084 __u32 new_len = 0;
2085 struct sk_buff *skb;
2086 struct qllc *qllcptr;
2087 struct ctcm_priv *priv = dev->ml_priv;
2088 struct mpc_group *grp = priv->mpcg;
2089
2090 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2091 __func__, mpcg_state_names[grp->saved_state]);
2092
2093 switch (grp->saved_state) {
2094 /*
2095 * establish conn callback function is
2096 * preferred method to report failure
2097 */
2098 case MPCG_STATE_XID0IOWAIT:
2099 case MPCG_STATE_XID0IOWAIX:
2100 case MPCG_STATE_XID7INITI:
2101 case MPCG_STATE_XID7INITZ:
2102 case MPCG_STATE_XID2INITW:
2103 case MPCG_STATE_XID2INITX:
2104 case MPCG_STATE_XID7INITW:
2105 case MPCG_STATE_XID7INITX:
2106 if (grp->estconnfunc) {
2107 grp->estconnfunc(grp->port_num, -1, 0);
2108 grp->estconnfunc = NULL;
2109 break;
2110 }
2111 case MPCG_STATE_FLOWC:
2112 case MPCG_STATE_READY:
2113 grp->send_qllc_disc = 2;
2114 new_len = sizeof(struct qllc);
2115 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2116 if (qllcptr == NULL) {
2117 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2118 "%s(%s): qllcptr allocation error",
2119 CTCM_FUNTAIL, dev->name);
2120 return -ENOMEM;
2121 }
2122
2123 qllcptr->qllc_address = 0xcc;
2124 qllcptr->qllc_commands = 0x03;
2125
2126 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2127
2128 if (skb == NULL) {
2129 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2130 "%s(%s): skb allocation error",
2131 CTCM_FUNTAIL, dev->name);
2132 priv->stats.rx_dropped++;
2133 kfree(qllcptr);
2134 return -ENOMEM;
2135 }
2136
2137 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2138 kfree(qllcptr);
2139
2140 if (skb_headroom(skb) < 4) {
2141 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2142 "%s(%s): skb_headroom error",
2143 CTCM_FUNTAIL, dev->name);
2144 dev_kfree_skb_any(skb);
2145 return -ENOMEM;
2146 }
2147
2148 *((__u32 *)skb_push(skb, 4)) =
2149 priv->channel[CTCM_READ]->pdu_seq;
2150 priv->channel[CTCM_READ]->pdu_seq++;
2151 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2152 __func__, priv->channel[CTCM_READ]->pdu_seq);
2153
2154 /* receipt of CC03 resets anticipated sequence number on
2155 receiving side */
2156 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2157 skb_reset_mac_header(skb);
2158 skb->dev = dev;
2159 skb->protocol = htons(ETH_P_SNAP);
2160 skb->ip_summed = CHECKSUM_UNNECESSARY;
2161
2162 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2163
2164 netif_rx(skb);
2165 break;
2166 default:
2167 break;
2168
2169 }
2170
2171 return 0;
2172 }
2173 /* --- This is the END my friend --- */
2174
Linux with added FPC-III support