1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2004, 2007
4 * Authors: Belinda Thompson (belindat@us.ibm.com)
5 * Andy Richter (richtera@us.ibm.com)
6 * Peter Tiedemann (ptiedem@de.ibm.com)
7 */
8
9 /*
10 This module exports functions to be used by CCS:
11 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
12 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
13 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
14 EXPORT_SYMBOL(ctc_mpc_flow_control);
15 */
16
17 #undef DEBUG
18 #undef DEBUGDATA
19 #undef DEBUGCCW
20
21 #define KMSG_COMPONENT "ctcm"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/interrupt.h>
31 #include <linux/timer.h>
32 #include <linux/sched.h>
33
34 #include <linux/signal.h>
35 #include <linux/string.h>
36 #include <linux/proc_fs.h>
37
38 #include <linux/ip.h>
39 #include <linux/if_arp.h>
40 #include <linux/tcp.h>
41 #include <linux/skbuff.h>
42 #include <linux/ctype.h>
43 #include <linux/netdevice.h>
44 #include <net/dst.h>
45
46 #include <linux/io.h> /* instead of <asm/io.h> ok ? */
47 #include <asm/ccwdev.h>
48 #include <asm/ccwgroup.h>
49 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */
50 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */
51 #include <linux/wait.h>
52 #include <linux/moduleparam.h>
53 #include <asm/idals.h>
54
55 #include "ctcm_main.h"
56 #include "ctcm_mpc.h"
57 #include "ctcm_fsms.h"
58
59 static const struct xid2 init_xid = {
60 .xid2_type_id = XID_FM2,
61 .xid2_len = 0x45,
62 .xid2_adj_id = 0,
63 .xid2_rlen = 0x31,
64 .xid2_resv1 = 0,
65 .xid2_flag1 = 0,
66 .xid2_fmtt = 0,
67 .xid2_flag4 = 0x80,
68 .xid2_resv2 = 0,
69 .xid2_tgnum = 0,
70 .xid2_sender_id = 0,
71 .xid2_flag2 = 0,
72 .xid2_option = XID2_0,
73 .xid2_resv3 = "\x00",
74 .xid2_resv4 = 0,
75 .xid2_dlc_type = XID2_READ_SIDE,
76 .xid2_resv5 = 0,
77 .xid2_mpc_flag = 0,
78 .xid2_resv6 = 0,
79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
80 };
81
82 static const struct th_header thnorm = {
83 .th_seg = 0x00,
84 .th_ch_flag = TH_IS_XID,
85 .th_blk_flag = TH_DATA_IS_XID,
86 .th_is_xid = 0x01,
87 .th_seq_num = 0x00000000,
88 };
89
90 static const struct th_header thdummy = {
91 .th_seg = 0x00,
92 .th_ch_flag = 0x00,
93 .th_blk_flag = TH_DATA_IS_XID,
94 .th_is_xid = 0x01,
95 .th_seq_num = 0x00000000,
96 };
97
98 /*
99 * Definition of one MPC group
100 */
101
102 /*
103 * Compatibility macros for busy handling
104 * of network devices.
105 */
106
107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
108
109 /*
110 * MPC Group state machine actions (static prototypes)
111 */
112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
116 static int mpc_validate_xid(struct mpcg_info *mpcginfo);
117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
123
124 #ifdef DEBUGDATA
125 /*-------------------------------------------------------------------*
126 * Dump buffer format *
127 * *
128 *--------------------------------------------------------------------*/
ctcmpc_dumpit(char * buf,int len)129 void ctcmpc_dumpit(char *buf, int len)
130 {
131 __u32 ct, sw, rm, dup;
132 char *ptr, *rptr;
133 char tbuf[82], tdup[82];
134 char addr[22];
135 char boff[12];
136 char bhex[82], duphex[82];
137 char basc[40];
138
139 sw = 0;
140 rptr = ptr = buf;
141 rm = 16;
142 duphex[0] = 0x00;
143 dup = 0;
144
145 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
146 if (sw == 0) {
147 sprintf(addr, "%16.16llx", (__u64)rptr);
148
149 sprintf(boff, "%4.4X", (__u32)ct);
150 bhex[0] = '\0';
151 basc[0] = '\0';
152 }
153 if ((sw == 4) || (sw == 12))
154 strcat(bhex, " ");
155 if (sw == 8)
156 strcat(bhex, " ");
157
158 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
159
160 tbuf[2] = '\0';
161 strcat(bhex, tbuf);
162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
163 basc[sw] = *ptr;
164 else
165 basc[sw] = '.';
166
167 basc[sw+1] = '\0';
168 sw++;
169 rm--;
170 if (sw != 16)
171 continue;
172 if ((strcmp(duphex, bhex)) != 0) {
173 if (dup != 0) {
174 sprintf(tdup,
175 "Duplicate as above to %s", addr);
176 ctcm_pr_debug(" --- %s ---\n",
177 tdup);
178 }
179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
180 addr, boff, bhex, basc);
181 dup = 0;
182 strcpy(duphex, bhex);
183 } else
184 dup++;
185
186 sw = 0;
187 rm = 16;
188 } /* endfor */
189
190 if (sw != 0) {
191 for ( ; rm > 0; rm--, sw++) {
192 if ((sw == 4) || (sw == 12))
193 strcat(bhex, " ");
194 if (sw == 8)
195 strcat(bhex, " ");
196 strcat(bhex, " ");
197 strcat(basc, " ");
198 }
199 if (dup != 0) {
200 sprintf(tdup, "Duplicate as above to %s", addr);
201 ctcm_pr_debug(" --- %s ---\n", tdup);
202 }
203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
204 addr, boff, bhex, basc);
205 } else {
206 if (dup >= 1) {
207 sprintf(tdup, "Duplicate as above to %s", addr);
208 ctcm_pr_debug(" --- %s ---\n", tdup);
209 }
210 if (dup != 0) {
211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
212 addr, boff, bhex, basc);
213 }
214 }
215
216 return;
217
218 } /* end of ctcmpc_dumpit */
219 #endif
220
221 #ifdef DEBUGDATA
222 /*
223 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
224 *
225 * skb The sk_buff to dump.
226 * offset Offset relative to skb-data, where to start the dump.
227 */
ctcmpc_dump_skb(struct sk_buff * skb,int offset)228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
229 {
230 __u8 *p = skb->data;
231 struct th_header *header;
232 struct pdu *pheader;
233 int bl = skb->len;
234 int i;
235
236 if (p == NULL)
237 return;
238
239 p += offset;
240 header = (struct th_header *)p;
241
242 ctcm_pr_debug("dump:\n");
243 ctcm_pr_debug("skb len=%d \n", skb->len);
244 if (skb->len > 2) {
245 switch (header->th_ch_flag) {
246 case TH_HAS_PDU:
247 break;
248 case 0x00:
249 case TH_IS_XID:
250 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
251 (header->th_is_xid == 0x01))
252 goto dumpth;
253 case TH_SWEEP_REQ:
254 goto dumpth;
255 case TH_SWEEP_RESP:
256 goto dumpth;
257 default:
258 break;
259 }
260
261 pheader = (struct pdu *)p;
262 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
263 pheader->pdu_offset, pheader->pdu_offset);
264 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
265 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
266 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
267 goto dumpdata;
268
269 dumpth:
270 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
271 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
272 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
273 ctcm_pr_debug("th->type : %s\n",
274 (header->th_is_xid) ? "DATA" : "XID");
275 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
276
277 }
278 dumpdata:
279 if (bl > 32)
280 bl = 32;
281 ctcm_pr_debug("data: ");
282 for (i = 0; i < bl; i++)
283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
284 ctcm_pr_debug("\n");
285 }
286 #endif
287
ctcmpc_get_dev(int port_num)288 static struct net_device *ctcmpc_get_dev(int port_num)
289 {
290 char device[20];
291 struct net_device *dev;
292 struct ctcm_priv *priv;
293
294 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
295
296 dev = __dev_get_by_name(&init_net, device);
297
298 if (dev == NULL) {
299 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
300 "%s: Device not found by name: %s",
301 CTCM_FUNTAIL, device);
302 return NULL;
303 }
304 priv = dev->ml_priv;
305 if (priv == NULL) {
306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
307 "%s(%s): dev->ml_priv is NULL",
308 CTCM_FUNTAIL, device);
309 return NULL;
310 }
311 if (priv->mpcg == NULL) {
312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
313 "%s(%s): priv->mpcg is NULL",
314 CTCM_FUNTAIL, device);
315 return NULL;
316 }
317 return dev;
318 }
319
320 /*
321 * ctc_mpc_alloc_channel
322 * (exported interface)
323 *
324 * Device Initialization :
325 * ACTPATH driven IO operations
326 */
ctc_mpc_alloc_channel(int port_num,void (* callback)(int,int))327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
328 {
329 struct net_device *dev;
330 struct mpc_group *grp;
331 struct ctcm_priv *priv;
332
333 dev = ctcmpc_get_dev(port_num);
334 if (dev == NULL)
335 return 1;
336 priv = dev->ml_priv;
337 grp = priv->mpcg;
338
339 grp->allochanfunc = callback;
340 grp->port_num = port_num;
341 grp->port_persist = 1;
342
343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
344 "%s(%s): state=%s",
345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
346
347 switch (fsm_getstate(grp->fsm)) {
348 case MPCG_STATE_INOP:
349 /* Group is in the process of terminating */
350 grp->alloc_called = 1;
351 break;
352 case MPCG_STATE_RESET:
353 /* MPC Group will transition to state */
354 /* MPCG_STATE_XID2INITW iff the minimum number */
355 /* of 1 read and 1 write channel have successfully*/
356 /* activated */
357 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
358 if (callback)
359 grp->send_qllc_disc = 1;
360 fallthrough;
361 case MPCG_STATE_XID0IOWAIT:
362 fsm_deltimer(&grp->timer);
363 grp->outstanding_xid2 = 0;
364 grp->outstanding_xid7 = 0;
365 grp->outstanding_xid7_p2 = 0;
366 grp->saved_xid2 = NULL;
367 if (callback)
368 ctcm_open(dev);
369 fsm_event(priv->fsm, DEV_EVENT_START, dev);
370 break;
371 case MPCG_STATE_READY:
372 /* XID exchanges completed after PORT was activated */
373 /* Link station already active */
374 /* Maybe timing issue...retry callback */
375 grp->allocchan_callback_retries++;
376 if (grp->allocchan_callback_retries < 4) {
377 if (grp->allochanfunc)
378 grp->allochanfunc(grp->port_num,
379 grp->group_max_buflen);
380 } else {
381 /* there are problems...bail out */
382 /* there may be a state mismatch so restart */
383 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
384 grp->allocchan_callback_retries = 0;
385 }
386 break;
387 }
388
389 return 0;
390 }
391 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
392
393 /*
394 * ctc_mpc_establish_connectivity
395 * (exported interface)
396 */
ctc_mpc_establish_connectivity(int port_num,void (* callback)(int,int,int))397 void ctc_mpc_establish_connectivity(int port_num,
398 void (*callback)(int, int, int))
399 {
400 struct net_device *dev;
401 struct mpc_group *grp;
402 struct ctcm_priv *priv;
403 struct channel *rch, *wch;
404
405 dev = ctcmpc_get_dev(port_num);
406 if (dev == NULL)
407 return;
408 priv = dev->ml_priv;
409 grp = priv->mpcg;
410 rch = priv->channel[CTCM_READ];
411 wch = priv->channel[CTCM_WRITE];
412
413 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
414 "%s(%s): state=%s",
415 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
416
417 grp->estconnfunc = callback;
418 grp->port_num = port_num;
419
420 switch (fsm_getstate(grp->fsm)) {
421 case MPCG_STATE_READY:
422 /* XID exchanges completed after PORT was activated */
423 /* Link station already active */
424 /* Maybe timing issue...retry callback */
425 fsm_deltimer(&grp->timer);
426 grp->estconn_callback_retries++;
427 if (grp->estconn_callback_retries < 4) {
428 if (grp->estconnfunc) {
429 grp->estconnfunc(grp->port_num, 0,
430 grp->group_max_buflen);
431 grp->estconnfunc = NULL;
432 }
433 } else {
434 /* there are problems...bail out */
435 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
436 grp->estconn_callback_retries = 0;
437 }
438 break;
439 case MPCG_STATE_INOP:
440 case MPCG_STATE_RESET:
441 /* MPC Group is not ready to start XID - min num of */
442 /* 1 read and 1 write channel have not been acquired*/
443
444 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
445 "%s(%s): REJECTED - inactive channels",
446 CTCM_FUNTAIL, dev->name);
447 if (grp->estconnfunc) {
448 grp->estconnfunc(grp->port_num, -1, 0);
449 grp->estconnfunc = NULL;
450 }
451 break;
452 case MPCG_STATE_XID2INITW:
453 /* alloc channel was called but no XID exchange */
454 /* has occurred. initiate xside XID exchange */
455 /* make sure yside XID0 processing has not started */
456
457 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
458 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
459 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
460 "%s(%s): ABORT - PASSIVE XID",
461 CTCM_FUNTAIL, dev->name);
462 break;
463 }
464 grp->send_qllc_disc = 1;
465 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
466 fsm_deltimer(&grp->timer);
467 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
468 MPCG_EVENT_TIMER, dev);
469 grp->outstanding_xid7 = 0;
470 grp->outstanding_xid7_p2 = 0;
471 grp->saved_xid2 = NULL;
472 if ((rch->in_mpcgroup) &&
473 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
474 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
475 else {
476 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
477 "%s(%s): RX-%s not ready for ACTIVE XID0",
478 CTCM_FUNTAIL, dev->name, rch->id);
479 if (grp->estconnfunc) {
480 grp->estconnfunc(grp->port_num, -1, 0);
481 grp->estconnfunc = NULL;
482 }
483 fsm_deltimer(&grp->timer);
484 goto done;
485 }
486 if ((wch->in_mpcgroup) &&
487 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
488 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
489 else {
490 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
491 "%s(%s): WX-%s not ready for ACTIVE XID0",
492 CTCM_FUNTAIL, dev->name, wch->id);
493 if (grp->estconnfunc) {
494 grp->estconnfunc(grp->port_num, -1, 0);
495 grp->estconnfunc = NULL;
496 }
497 fsm_deltimer(&grp->timer);
498 goto done;
499 }
500 break;
501 case MPCG_STATE_XID0IOWAIT:
502 /* already in active XID negotiations */
503 default:
504 break;
505 }
506
507 done:
508 CTCM_PR_DEBUG("Exit %s()\n", __func__);
509 return;
510 }
511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
512
513 /*
514 * ctc_mpc_dealloc_ch
515 * (exported interface)
516 */
ctc_mpc_dealloc_ch(int port_num)517 void ctc_mpc_dealloc_ch(int port_num)
518 {
519 struct net_device *dev;
520 struct ctcm_priv *priv;
521 struct mpc_group *grp;
522
523 dev = ctcmpc_get_dev(port_num);
524 if (dev == NULL)
525 return;
526 priv = dev->ml_priv;
527 grp = priv->mpcg;
528
529 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
530 "%s: %s: refcount = %d\n",
531 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
532
533 fsm_deltimer(&priv->restart_timer);
534 grp->channels_terminating = 0;
535 fsm_deltimer(&grp->timer);
536 grp->allochanfunc = NULL;
537 grp->estconnfunc = NULL;
538 grp->port_persist = 0;
539 grp->send_qllc_disc = 0;
540 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
541
542 ctcm_close(dev);
543 return;
544 }
545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
546
547 /*
548 * ctc_mpc_flow_control
549 * (exported interface)
550 */
ctc_mpc_flow_control(int port_num,int flowc)551 void ctc_mpc_flow_control(int port_num, int flowc)
552 {
553 struct ctcm_priv *priv;
554 struct mpc_group *grp;
555 struct net_device *dev;
556 struct channel *rch;
557 int mpcg_state;
558
559 dev = ctcmpc_get_dev(port_num);
560 if (dev == NULL)
561 return;
562 priv = dev->ml_priv;
563 grp = priv->mpcg;
564
565 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
566 "%s: %s: flowc = %d",
567 CTCM_FUNTAIL, dev->name, flowc);
568
569 rch = priv->channel[CTCM_READ];
570
571 mpcg_state = fsm_getstate(grp->fsm);
572 switch (flowc) {
573 case 1:
574 if (mpcg_state == MPCG_STATE_FLOWC)
575 break;
576 if (mpcg_state == MPCG_STATE_READY) {
577 if (grp->flow_off_called == 1)
578 grp->flow_off_called = 0;
579 else
580 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
581 break;
582 }
583 break;
584 case 0:
585 if (mpcg_state == MPCG_STATE_FLOWC) {
586 fsm_newstate(grp->fsm, MPCG_STATE_READY);
587 /* ensure any data that has accumulated */
588 /* on the io_queue will now be sen t */
589 tasklet_schedule(&rch->ch_tasklet);
590 }
591 /* possible race condition */
592 if (mpcg_state == MPCG_STATE_READY) {
593 grp->flow_off_called = 1;
594 break;
595 }
596 break;
597 }
598
599 }
600 EXPORT_SYMBOL(ctc_mpc_flow_control);
601
602 static int mpc_send_qllc_discontact(struct net_device *);
603
604 /*
605 * helper function of ctcmpc_unpack_skb
606 */
mpc_rcvd_sweep_resp(struct mpcg_info * mpcginfo)607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
608 {
609 struct channel *rch = mpcginfo->ch;
610 struct net_device *dev = rch->netdev;
611 struct ctcm_priv *priv = dev->ml_priv;
612 struct mpc_group *grp = priv->mpcg;
613 struct channel *ch = priv->channel[CTCM_WRITE];
614
615 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
616 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
617
618 grp->sweep_rsp_pend_num--;
619
620 if ((grp->sweep_req_pend_num == 0) &&
621 (grp->sweep_rsp_pend_num == 0)) {
622 fsm_deltimer(&ch->sweep_timer);
623 grp->in_sweep = 0;
624 rch->th_seq_num = 0x00;
625 ch->th_seq_num = 0x00;
626 ctcm_clear_busy_do(dev);
627 }
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 */
ctcmpc_send_sweep_resp(struct channel * rch)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 = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
657 header->th.th_ch_flag = TH_SWEEP_RESP;
658 header->sw.th_last_seq = ch->th_seq_num;
659
660 netif_trans_update(dev);
661 skb_queue_tail(&ch->sweep_queue, sweep_skb);
662
663 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
664
665 return;
666
667 done:
668 grp->in_sweep = 0;
669 ctcm_clear_busy_do(dev);
670 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
671
672 return;
673 }
674
675 /*
676 * helper function of ctcmpc_unpack_skb
677 */
mpc_rcvd_sweep_req(struct mpcg_info * mpcginfo)678 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
679 {
680 struct channel *rch = mpcginfo->ch;
681 struct net_device *dev = rch->netdev;
682 struct ctcm_priv *priv = dev->ml_priv;
683 struct mpc_group *grp = priv->mpcg;
684 struct channel *ch = priv->channel[CTCM_WRITE];
685
686 if (do_debug)
687 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
688 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
689
690 if (grp->in_sweep == 0) {
691 grp->in_sweep = 1;
692 ctcm_test_and_set_busy(dev);
693 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
694 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
695 }
696
697 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
698
699 grp->sweep_req_pend_num--;
700 ctcmpc_send_sweep_resp(ch);
701 kfree(mpcginfo);
702 return;
703 }
704
705 /*
706 * MPC Group Station FSM definitions
707 */
708 static const char *mpcg_event_names[] = {
709 [MPCG_EVENT_INOP] = "INOP Condition",
710 [MPCG_EVENT_DISCONC] = "Discontact Received",
711 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
712 [MPCG_EVENT_XID2] = "XID2 Received",
713 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
714 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
715 [MPCG_EVENT_TIMER] = "XID Setup Timer",
716 [MPCG_EVENT_DOIO] = "XID DoIO",
717 };
718
719 static const char *mpcg_state_names[] = {
720 [MPCG_STATE_RESET] = "Reset",
721 [MPCG_STATE_INOP] = "INOP",
722 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
723 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
724 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
725 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
726 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
727 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
728 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
729 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
730 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
731 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
732 [MPCG_STATE_READY] = "READY",
733 };
734
735 /*
736 * The MPC Group Station FSM
737 * 22 events
738 */
739 static const fsm_node mpcg_fsm[] = {
740 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
741 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
742 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
743
744 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
745 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
746
747 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
748 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
749 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
750 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
751 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
752
753 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
754 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
755 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
756 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
757 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
758
759 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
760 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
761 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
762 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
763 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
764 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
765 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
766
767 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
768 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
769 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
770 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
771 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
772 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
773
774 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
775 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
776 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
777 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
778 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
779 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
780
781 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
782 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
783 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
784 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
785 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
786 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
787
788 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
789 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
790 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
791 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
792 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
793 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
794 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
795
796 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
797 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
798 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
799 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
800 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
801 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
802
803 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
804 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
805 };
806
807 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
808
809 /*
810 * MPC Group Station FSM action
811 * CTCM_PROTO_MPC only
812 */
mpc_action_go_ready(fsm_instance * fsm,int event,void * arg)813 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
814 {
815 struct net_device *dev = arg;
816 struct ctcm_priv *priv = dev->ml_priv;
817 struct mpc_group *grp = priv->mpcg;
818
819 if (grp == NULL) {
820 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
821 "%s(%s): No MPC group",
822 CTCM_FUNTAIL, dev->name);
823 return;
824 }
825
826 fsm_deltimer(&grp->timer);
827
828 if (grp->saved_xid2->xid2_flag2 == 0x40) {
829 priv->xid->xid2_flag2 = 0x00;
830 if (grp->estconnfunc) {
831 grp->estconnfunc(grp->port_num, 1,
832 grp->group_max_buflen);
833 grp->estconnfunc = NULL;
834 } else if (grp->allochanfunc)
835 grp->send_qllc_disc = 1;
836
837 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
838 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
839 "%s(%s): fails",
840 CTCM_FUNTAIL, dev->name);
841 return;
842 }
843
844 grp->port_persist = 1;
845 grp->out_of_sequence = 0;
846 grp->estconn_called = 0;
847
848 tasklet_hi_schedule(&grp->mpc_tasklet2);
849
850 return;
851 }
852
853 /*
854 * helper of ctcm_init_netdevice
855 * CTCM_PROTO_MPC only
856 */
mpc_group_ready(unsigned long adev)857 void mpc_group_ready(unsigned long adev)
858 {
859 struct net_device *dev = (struct net_device *)adev;
860 struct ctcm_priv *priv = dev->ml_priv;
861 struct mpc_group *grp = priv->mpcg;
862 struct channel *ch = NULL;
863
864 if (grp == NULL) {
865 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
866 "%s(%s): No MPC group",
867 CTCM_FUNTAIL, dev->name);
868 return;
869 }
870
871 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
872 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
873 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
874
875 fsm_newstate(grp->fsm, MPCG_STATE_READY);
876
877 /* Put up a read on the channel */
878 ch = priv->channel[CTCM_READ];
879 ch->pdu_seq = 0;
880 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
881 __func__, ch->pdu_seq);
882
883 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
884 /* Put the write channel in idle state */
885 ch = priv->channel[CTCM_WRITE];
886 if (ch->collect_len > 0) {
887 spin_lock(&ch->collect_lock);
888 ctcm_purge_skb_queue(&ch->collect_queue);
889 ch->collect_len = 0;
890 spin_unlock(&ch->collect_lock);
891 }
892 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
893 ctcm_clear_busy(dev);
894
895 if (grp->estconnfunc) {
896 grp->estconnfunc(grp->port_num, 0,
897 grp->group_max_buflen);
898 grp->estconnfunc = NULL;
899 } else if (grp->allochanfunc)
900 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
901
902 grp->send_qllc_disc = 1;
903 grp->changed_side = 0;
904
905 return;
906
907 }
908
909 /*
910 * Increment the MPC Group Active Channel Counts
911 * helper of dev_action (called from channel fsm)
912 */
mpc_channel_action(struct channel * ch,int direction,int action)913 void mpc_channel_action(struct channel *ch, int direction, int action)
914 {
915 struct net_device *dev = ch->netdev;
916 struct ctcm_priv *priv = dev->ml_priv;
917 struct mpc_group *grp = priv->mpcg;
918
919 if (grp == NULL) {
920 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
921 "%s(%s): No MPC group",
922 CTCM_FUNTAIL, dev->name);
923 return;
924 }
925
926 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
927
928 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
929 "%s: %i / Grp:%s total_channels=%i, active_channels: "
930 "read=%i, write=%i\n", __func__, action,
931 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
932 grp->active_channels[CTCM_READ],
933 grp->active_channels[CTCM_WRITE]);
934
935 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
936 grp->num_channel_paths++;
937 grp->active_channels[direction]++;
938 grp->outstanding_xid2++;
939 ch->in_mpcgroup = 1;
940
941 if (ch->xid_skb != NULL)
942 dev_kfree_skb_any(ch->xid_skb);
943
944 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
945 GFP_ATOMIC | GFP_DMA);
946 if (ch->xid_skb == NULL) {
947 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
948 "%s(%s): Couldn't alloc ch xid_skb\n",
949 CTCM_FUNTAIL, dev->name);
950 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
951 return;
952 }
953 ch->xid_skb_data = ch->xid_skb->data;
954 ch->xid_th = (struct th_header *)ch->xid_skb->data;
955 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
956 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
957 skb_put(ch->xid_skb, XID2_LENGTH);
958 ch->xid_id = skb_tail_pointer(ch->xid_skb);
959 ch->xid_skb->data = ch->xid_skb_data;
960 skb_reset_tail_pointer(ch->xid_skb);
961 ch->xid_skb->len = 0;
962
963 skb_put_data(ch->xid_skb, grp->xid_skb->data,
964 grp->xid_skb->len);
965
966 ch->xid->xid2_dlc_type =
967 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
968 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
969
970 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
971 ch->xid->xid2_buf_len = 0x00;
972
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 fsm_newstate(ch->fsm, CH_XID0_PENDING);
978
979 if ((grp->active_channels[CTCM_READ] > 0) &&
980 (grp->active_channels[CTCM_WRITE] > 0) &&
981 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
982 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
983 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
984 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
985 __func__, dev->name);
986 }
987 } else if ((action == MPC_CHANNEL_REMOVE) &&
988 (ch->in_mpcgroup == 1)) {
989 ch->in_mpcgroup = 0;
990 grp->num_channel_paths--;
991 grp->active_channels[direction]--;
992
993 if (ch->xid_skb != NULL)
994 dev_kfree_skb_any(ch->xid_skb);
995 ch->xid_skb = NULL;
996
997 if (grp->channels_terminating)
998 goto done;
999
1000 if (((grp->active_channels[CTCM_READ] == 0) &&
1001 (grp->active_channels[CTCM_WRITE] > 0))
1002 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1003 (grp->active_channels[CTCM_READ] > 0)))
1004 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1005 }
1006 done:
1007 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1008 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1009 "read=%i, write=%i\n", __func__, action,
1010 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1011 grp->active_channels[CTCM_READ],
1012 grp->active_channels[CTCM_WRITE]);
1013
1014 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1015 }
1016
1017 /**
1018 * Unpack a just received skb and hand it over to
1019 * upper layers.
1020 * special MPC version of unpack_skb.
1021 *
1022 * ch The channel where this skb has been received.
1023 * pskb The received skb.
1024 */
ctcmpc_unpack_skb(struct channel * ch,struct sk_buff * pskb)1025 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1026 {
1027 struct net_device *dev = ch->netdev;
1028 struct ctcm_priv *priv = dev->ml_priv;
1029 struct mpc_group *grp = priv->mpcg;
1030 struct pdu *curr_pdu;
1031 struct mpcg_info *mpcginfo;
1032 struct th_header *header = NULL;
1033 struct th_sweep *sweep = NULL;
1034 int pdu_last_seen = 0;
1035 __u32 new_len;
1036 struct sk_buff *skb;
1037 int skblen;
1038 int sendrc = 0;
1039
1040 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1041 __func__, dev->name, smp_processor_id(), ch->id);
1042
1043 header = (struct th_header *)pskb->data;
1044 if ((header->th_seg == 0) &&
1045 (header->th_ch_flag == 0) &&
1046 (header->th_blk_flag == 0) &&
1047 (header->th_seq_num == 0))
1048 /* nothing for us */ goto done;
1049
1050 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1051 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1052 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1053
1054 pskb->dev = dev;
1055 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1056 skb_pull(pskb, TH_HEADER_LENGTH);
1057
1058 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1059 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1060 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1061 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1062 (header->th_seq_num != ch->th_seq_num + 1) &&
1063 (ch->th_seq_num != 0))) {
1064 /* This is NOT the next segment *
1065 * we are not the correct race winner *
1066 * go away and let someone else win *
1067 * BUT..this only applies if xid negot *
1068 * is done *
1069 */
1070 grp->out_of_sequence += 1;
1071 __skb_push(pskb, TH_HEADER_LENGTH);
1072 skb_queue_tail(&ch->io_queue, pskb);
1073 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1074 "got:%08x\n", __func__,
1075 ch->th_seq_num + 1, header->th_seq_num);
1076
1077 return;
1078 }
1079 grp->out_of_sequence = 0;
1080 ch->th_seq_num = header->th_seq_num;
1081
1082 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1083 __func__, ch->th_seq_num);
1084
1085 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1086 goto done;
1087 while ((pskb->len > 0) && !pdu_last_seen) {
1088 curr_pdu = (struct pdu *)pskb->data;
1089
1090 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1091 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1092 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1093 __func__, pskb->len);
1094
1095 skb_pull(pskb, PDU_HEADER_LENGTH);
1096
1097 if (curr_pdu->pdu_flag & PDU_LAST)
1098 pdu_last_seen = 1;
1099 if (curr_pdu->pdu_flag & PDU_CNTL)
1100 pskb->protocol = htons(ETH_P_SNAP);
1101 else
1102 pskb->protocol = htons(ETH_P_SNA_DIX);
1103
1104 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1105 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1106 "%s(%s): Dropping packet with "
1107 "illegal siize %d",
1108 CTCM_FUNTAIL, dev->name, pskb->len);
1109
1110 priv->stats.rx_dropped++;
1111 priv->stats.rx_length_errors++;
1112 goto done;
1113 }
1114 skb_reset_mac_header(pskb);
1115 new_len = curr_pdu->pdu_offset;
1116 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1117 __func__, new_len);
1118 if ((new_len == 0) || (new_len > pskb->len)) {
1119 /* should never happen */
1120 /* pskb len must be hosed...bail out */
1121 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1122 "%s(%s): non valid pdu_offset: %04x",
1123 /* "data may be lost", */
1124 CTCM_FUNTAIL, dev->name, new_len);
1125 goto done;
1126 }
1127 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1128
1129 if (!skb) {
1130 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1131 "%s(%s): MEMORY allocation error",
1132 CTCM_FUNTAIL, dev->name);
1133 priv->stats.rx_dropped++;
1134 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1135 goto done;
1136 }
1137 skb_put_data(skb, pskb->data, new_len);
1138
1139 skb_reset_mac_header(skb);
1140 skb->dev = pskb->dev;
1141 skb->protocol = pskb->protocol;
1142 skb->ip_summed = CHECKSUM_UNNECESSARY;
1143 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1144 ch->pdu_seq++;
1145
1146 if (do_debug_data) {
1147 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1148 __func__, ch->pdu_seq);
1149 ctcm_pr_debug("%s: skb:%0lx "
1150 "skb len: %d \n", __func__,
1151 (unsigned long)skb, skb->len);
1152 ctcm_pr_debug("%s: up to 32 bytes "
1153 "of pdu_data sent\n", __func__);
1154 ctcmpc_dump32((char *)skb->data, skb->len);
1155 }
1156
1157 skblen = skb->len;
1158 sendrc = netif_rx(skb);
1159 priv->stats.rx_packets++;
1160 priv->stats.rx_bytes += skblen;
1161 skb_pull(pskb, new_len); /* point to next PDU */
1162 }
1163 } else {
1164 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1165 if (mpcginfo == NULL)
1166 goto done;
1167
1168 mpcginfo->ch = ch;
1169 mpcginfo->th = header;
1170 mpcginfo->skb = pskb;
1171 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1172 __func__);
1173 /* it's a sweep? */
1174 sweep = (struct th_sweep *)pskb->data;
1175 mpcginfo->sweep = sweep;
1176 if (header->th_ch_flag == TH_SWEEP_REQ)
1177 mpc_rcvd_sweep_req(mpcginfo);
1178 else if (header->th_ch_flag == TH_SWEEP_RESP)
1179 mpc_rcvd_sweep_resp(mpcginfo);
1180 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1181 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1182 skb_pull(pskb, XID2_LENGTH);
1183 mpcginfo->xid = thisxid;
1184 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1185 } else if (header->th_blk_flag == TH_DISCONTACT)
1186 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1187 else if (header->th_seq_num != 0) {
1188 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1189 "%s(%s): control pkt expected\n",
1190 CTCM_FUNTAIL, dev->name);
1191 priv->stats.rx_dropped++;
1192 /* mpcginfo only used for non-data transfers */
1193 if (do_debug_data)
1194 ctcmpc_dump_skb(pskb, -8);
1195 }
1196 kfree(mpcginfo);
1197 }
1198 done:
1199
1200 dev_kfree_skb_any(pskb);
1201 if (sendrc == NET_RX_DROP) {
1202 dev_warn(&dev->dev,
1203 "The network backlog for %s is exceeded, "
1204 "package dropped\n", __func__);
1205 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1206 }
1207
1208 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1209 __func__, dev->name, ch, ch->id);
1210 }
1211
1212 /**
1213 * tasklet helper for mpc's skb unpacking.
1214 *
1215 * ch The channel to work on.
1216 * Allow flow control back pressure to occur here.
1217 * Throttling back channel can result in excessive
1218 * channel inactivity and system deact of channel
1219 */
ctcmpc_bh(unsigned long thischan)1220 void ctcmpc_bh(unsigned long thischan)
1221 {
1222 struct channel *ch = (struct channel *)thischan;
1223 struct sk_buff *skb;
1224 struct net_device *dev = ch->netdev;
1225 struct ctcm_priv *priv = dev->ml_priv;
1226 struct mpc_group *grp = priv->mpcg;
1227
1228 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1229 dev->name, smp_processor_id(), __func__, ch->id);
1230 /* caller has requested driver to throttle back */
1231 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1232 (skb = skb_dequeue(&ch->io_queue))) {
1233 ctcmpc_unpack_skb(ch, skb);
1234 if (grp->out_of_sequence > 20) {
1235 /* assume data loss has occurred if */
1236 /* missing seq_num for extended */
1237 /* period of time */
1238 grp->out_of_sequence = 0;
1239 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1240 break;
1241 }
1242 if (skb == skb_peek(&ch->io_queue))
1243 break;
1244 }
1245 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1246 __func__, dev->name, ch, ch->id);
1247 return;
1248 }
1249
1250 /*
1251 * MPC Group Initializations
1252 */
ctcmpc_init_mpc_group(struct ctcm_priv * priv)1253 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1254 {
1255 struct mpc_group *grp;
1256
1257 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1258 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1259
1260 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1261 if (grp == NULL)
1262 return NULL;
1263
1264 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1265 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1266 mpcg_fsm_len, GFP_KERNEL);
1267 if (grp->fsm == NULL) {
1268 kfree(grp);
1269 return NULL;
1270 }
1271
1272 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1273 fsm_settimer(grp->fsm, &grp->timer);
1274
1275 grp->xid_skb =
1276 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1277 if (grp->xid_skb == NULL) {
1278 kfree_fsm(grp->fsm);
1279 kfree(grp);
1280 return NULL;
1281 }
1282 /* base xid for all channels in group */
1283 grp->xid_skb_data = grp->xid_skb->data;
1284 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1285 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1286
1287 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1288 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1289 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1290 grp->xid->xid2_sender_id = jiffies;
1291
1292 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1293 skb_put_data(grp->xid_skb, "VTAM", 4);
1294
1295 grp->rcvd_xid_skb =
1296 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1297 if (grp->rcvd_xid_skb == NULL) {
1298 kfree_fsm(grp->fsm);
1299 dev_kfree_skb(grp->xid_skb);
1300 kfree(grp);
1301 return NULL;
1302 }
1303 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1304 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1305 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1306 grp->saved_xid2 = NULL;
1307 priv->xid = grp->xid;
1308 priv->mpcg = grp;
1309 return grp;
1310 }
1311
1312 /*
1313 * The MPC Group Station FSM
1314 */
1315
1316 /*
1317 * MPC Group Station FSM actions
1318 * CTCM_PROTO_MPC only
1319 */
1320
1321 /**
1322 * NOP action for statemachines
1323 */
mpc_action_nop(fsm_instance * fi,int event,void * arg)1324 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1325 {
1326 }
1327
1328 /*
1329 * invoked when the device transitions to dev_stopped
1330 * MPC will stop each individual channel if a single XID failure
1331 * occurs, or will intitiate all channels be stopped if a GROUP
1332 * level failure occurs.
1333 */
mpc_action_go_inop(fsm_instance * fi,int event,void * arg)1334 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1335 {
1336 struct net_device *dev = arg;
1337 struct ctcm_priv *priv;
1338 struct mpc_group *grp;
1339 struct channel *wch;
1340
1341 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1342
1343 priv = dev->ml_priv;
1344 grp = priv->mpcg;
1345 grp->flow_off_called = 0;
1346 fsm_deltimer(&grp->timer);
1347 if (grp->channels_terminating)
1348 return;
1349
1350 grp->channels_terminating = 1;
1351 grp->saved_state = fsm_getstate(grp->fsm);
1352 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1353 if (grp->saved_state > MPCG_STATE_XID7INITF)
1354 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1355 "%s(%s): MPC GROUP INOPERATIVE",
1356 CTCM_FUNTAIL, dev->name);
1357 if ((grp->saved_state != MPCG_STATE_RESET) ||
1358 /* dealloc_channel has been called */
1359 (grp->port_persist == 0))
1360 fsm_deltimer(&priv->restart_timer);
1361
1362 wch = priv->channel[CTCM_WRITE];
1363
1364 switch (grp->saved_state) {
1365 case MPCG_STATE_RESET:
1366 case MPCG_STATE_INOP:
1367 case MPCG_STATE_XID2INITW:
1368 case MPCG_STATE_XID0IOWAIT:
1369 case MPCG_STATE_XID2INITX:
1370 case MPCG_STATE_XID7INITW:
1371 case MPCG_STATE_XID7INITX:
1372 case MPCG_STATE_XID0IOWAIX:
1373 case MPCG_STATE_XID7INITI:
1374 case MPCG_STATE_XID7INITZ:
1375 case MPCG_STATE_XID7INITF:
1376 break;
1377 case MPCG_STATE_FLOWC:
1378 case MPCG_STATE_READY:
1379 default:
1380 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1381 }
1382
1383 grp->xid2_tgnum = 0;
1384 grp->group_max_buflen = 0; /*min of all received */
1385 grp->outstanding_xid2 = 0;
1386 grp->outstanding_xid7 = 0;
1387 grp->outstanding_xid7_p2 = 0;
1388 grp->saved_xid2 = NULL;
1389 grp->xidnogood = 0;
1390 grp->changed_side = 0;
1391
1392 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1393 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1394 grp->rcvd_xid_skb->len = 0;
1395 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1396 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1397
1398 if (grp->send_qllc_disc == 1) {
1399 grp->send_qllc_disc = 0;
1400 mpc_send_qllc_discontact(dev);
1401 }
1402
1403 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1404 /* This can result in INOP of VTAM PU due to halting of */
1405 /* outstanding IO which causes a sense to be returned */
1406 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1407 /* become unreachable without manual intervention */
1408 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1409 grp->alloc_called = 0;
1410 fsm_deltimer(&priv->restart_timer);
1411 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1412 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1413 if (grp->saved_state > MPCG_STATE_XID7INITF)
1414 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1415 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1416 CTCM_FUNTAIL, dev->name);
1417 } else {
1418 fsm_deltimer(&priv->restart_timer);
1419 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1420 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1421 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1422 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1423 CTCM_FUNTAIL, dev->name);
1424 }
1425 }
1426
1427 /**
1428 * Handle mpc group action timeout.
1429 * MPC Group Station FSM action
1430 * CTCM_PROTO_MPC only
1431 *
1432 * fi An instance of an mpc_group fsm.
1433 * event The event, just happened.
1434 * arg Generic pointer, casted from net_device * upon call.
1435 */
mpc_action_timeout(fsm_instance * fi,int event,void * arg)1436 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1437 {
1438 struct net_device *dev = arg;
1439 struct ctcm_priv *priv;
1440 struct mpc_group *grp;
1441 struct channel *wch;
1442 struct channel *rch;
1443
1444 priv = dev->ml_priv;
1445 grp = priv->mpcg;
1446 wch = priv->channel[CTCM_WRITE];
1447 rch = priv->channel[CTCM_READ];
1448
1449 switch (fsm_getstate(grp->fsm)) {
1450 case MPCG_STATE_XID2INITW:
1451 /* Unless there is outstanding IO on the */
1452 /* channel just return and wait for ATTN */
1453 /* interrupt to begin XID negotiations */
1454 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1455 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1456 break;
1457 fallthrough;
1458 default:
1459 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1460 }
1461
1462 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1463 "%s: dev=%s exit",
1464 CTCM_FUNTAIL, dev->name);
1465 return;
1466 }
1467
1468 /*
1469 * MPC Group Station FSM action
1470 * CTCM_PROTO_MPC only
1471 */
mpc_action_discontact(fsm_instance * fi,int event,void * arg)1472 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1473 {
1474 struct mpcg_info *mpcginfo = arg;
1475 struct channel *ch = mpcginfo->ch;
1476 struct net_device *dev;
1477 struct ctcm_priv *priv;
1478 struct mpc_group *grp;
1479
1480 if (ch) {
1481 dev = ch->netdev;
1482 if (dev) {
1483 priv = dev->ml_priv;
1484 if (priv) {
1485 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1486 "%s: %s: %s\n",
1487 CTCM_FUNTAIL, dev->name, ch->id);
1488 grp = priv->mpcg;
1489 grp->send_qllc_disc = 1;
1490 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1491 }
1492 }
1493 }
1494
1495 return;
1496 }
1497
1498 /*
1499 * MPC Group Station - not part of FSM
1500 * CTCM_PROTO_MPC only
1501 * called from add_channel in ctcm_main.c
1502 */
mpc_action_send_discontact(unsigned long thischan)1503 void mpc_action_send_discontact(unsigned long thischan)
1504 {
1505 int rc;
1506 struct channel *ch = (struct channel *)thischan;
1507 unsigned long saveflags = 0;
1508
1509 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1510 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1511 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1512
1513 if (rc != 0) {
1514 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1515 }
1516
1517 return;
1518 }
1519
1520
1521 /*
1522 * helper function of mpc FSM
1523 * CTCM_PROTO_MPC only
1524 * mpc_action_rcvd_xid7
1525 */
mpc_validate_xid(struct mpcg_info * mpcginfo)1526 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1527 {
1528 struct channel *ch = mpcginfo->ch;
1529 struct net_device *dev = ch->netdev;
1530 struct ctcm_priv *priv = dev->ml_priv;
1531 struct mpc_group *grp = priv->mpcg;
1532 struct xid2 *xid = mpcginfo->xid;
1533 int rc = 0;
1534 __u64 our_id = 0;
1535 __u64 their_id = 0;
1536 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1537
1538 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1539
1540 if (xid == NULL) {
1541 rc = 1;
1542 /* XID REJECTED: xid == NULL */
1543 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1544 "%s(%s): xid = NULL",
1545 CTCM_FUNTAIL, ch->id);
1546 goto done;
1547 }
1548
1549 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1550
1551 /*the received direction should be the opposite of ours */
1552 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1553 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1554 rc = 2;
1555 /* XID REJECTED: r/w channel pairing mismatch */
1556 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1557 "%s(%s): r/w channel pairing mismatch",
1558 CTCM_FUNTAIL, ch->id);
1559 goto done;
1560 }
1561
1562 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1563 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1564 grp->group_max_buflen, xid->xid2_buf_len);
1565
1566 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1567 xid->xid2_buf_len - len)
1568 grp->group_max_buflen = xid->xid2_buf_len - len;
1569 }
1570
1571 if (grp->saved_xid2 == NULL) {
1572 grp->saved_xid2 =
1573 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1574
1575 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1576 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1577
1578 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1579 grp->rcvd_xid_skb->len = 0;
1580
1581 /* convert two 32 bit numbers into 1 64 bit for id compare */
1582 our_id = (__u64)priv->xid->xid2_adj_id;
1583 our_id = our_id << 32;
1584 our_id = our_id + priv->xid->xid2_sender_id;
1585 their_id = (__u64)xid->xid2_adj_id;
1586 their_id = their_id << 32;
1587 their_id = their_id + xid->xid2_sender_id;
1588 /* lower id assume the xside role */
1589 if (our_id < their_id) {
1590 grp->roll = XSIDE;
1591 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1592 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1593 CTCM_FUNTAIL, ch->id);
1594 } else {
1595 grp->roll = YSIDE;
1596 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1597 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1598 CTCM_FUNTAIL, ch->id);
1599 }
1600
1601 } else {
1602 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1603 rc = 3;
1604 /* XID REJECTED: xid flag byte4 mismatch */
1605 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1606 "%s(%s): xid flag byte4 mismatch",
1607 CTCM_FUNTAIL, ch->id);
1608 }
1609 if (xid->xid2_flag2 == 0x40) {
1610 rc = 4;
1611 /* XID REJECTED - xid NOGOOD */
1612 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1613 "%s(%s): xid NOGOOD",
1614 CTCM_FUNTAIL, ch->id);
1615 }
1616 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1617 rc = 5;
1618 /* XID REJECTED - Adjacent Station ID Mismatch */
1619 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620 "%s(%s): Adjacent Station ID Mismatch",
1621 CTCM_FUNTAIL, ch->id);
1622 }
1623 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1624 rc = 6;
1625 /* XID REJECTED - Sender Address Mismatch */
1626 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627 "%s(%s): Sender Address Mismatch",
1628 CTCM_FUNTAIL, ch->id);
1629 }
1630 }
1631 done:
1632 if (rc) {
1633 dev_warn(&dev->dev,
1634 "The XID used in the MPC protocol is not valid, "
1635 "rc = %d\n", rc);
1636 priv->xid->xid2_flag2 = 0x40;
1637 grp->saved_xid2->xid2_flag2 = 0x40;
1638 }
1639
1640 return rc;
1641 }
1642
1643 /*
1644 * MPC Group Station FSM action
1645 * CTCM_PROTO_MPC only
1646 */
mpc_action_side_xid(fsm_instance * fsm,void * arg,int side)1647 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1648 {
1649 struct channel *ch = arg;
1650 int rc = 0;
1651 int gotlock = 0;
1652 unsigned long saveflags = 0; /* avoids compiler warning with
1653 spin_unlock_irqrestore */
1654
1655 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1656 __func__, smp_processor_id(), ch, ch->id);
1657
1658 if (ctcm_checkalloc_buffer(ch))
1659 goto done;
1660
1661 /*
1662 * skb data-buffer referencing:
1663 */
1664 ch->trans_skb->data = ch->trans_skb_data;
1665 skb_reset_tail_pointer(ch->trans_skb);
1666 ch->trans_skb->len = 0;
1667 /* result of the previous 3 statements is NOT always
1668 * already set after ctcm_checkalloc_buffer
1669 * because of possible reuse of the trans_skb
1670 */
1671 memset(ch->trans_skb->data, 0, 16);
1672 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1673 /* check is main purpose here: */
1674 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1675 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1676 /* check is main purpose here: */
1677 skb_put(ch->trans_skb, XID2_LENGTH);
1678 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1679 /* cleanup back to startpoint */
1680 ch->trans_skb->data = ch->trans_skb_data;
1681 skb_reset_tail_pointer(ch->trans_skb);
1682 ch->trans_skb->len = 0;
1683
1684 /* non-checking rewrite of above skb data-buffer referencing: */
1685 /*
1686 memset(ch->trans_skb->data, 0, 16);
1687 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1688 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1689 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1690 */
1691
1692 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1693 ch->ccw[8].count = 0;
1694 ch->ccw[8].cda = 0x00;
1695
1696 if (!(ch->xid_th && ch->xid && ch->xid_id))
1697 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1698 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1699 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1700
1701 if (side == XSIDE) {
1702 /* mpc_action_xside_xid */
1703 if (ch->xid_th == NULL)
1704 goto done;
1705 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1706 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1707 ch->ccw[9].count = TH_HEADER_LENGTH;
1708 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1709
1710 if (ch->xid == NULL)
1711 goto done;
1712 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1713 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1714 ch->ccw[10].count = XID2_LENGTH;
1715 ch->ccw[10].cda = virt_to_phys(ch->xid);
1716
1717 ch->ccw[11].cmd_code = CCW_CMD_READ;
1718 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1719 ch->ccw[11].count = TH_HEADER_LENGTH;
1720 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1721
1722 ch->ccw[12].cmd_code = CCW_CMD_READ;
1723 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1724 ch->ccw[12].count = XID2_LENGTH;
1725 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1726
1727 ch->ccw[13].cmd_code = CCW_CMD_READ;
1728 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1729
1730 } else { /* side == YSIDE : mpc_action_yside_xid */
1731 ch->ccw[9].cmd_code = CCW_CMD_READ;
1732 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1733 ch->ccw[9].count = TH_HEADER_LENGTH;
1734 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1735
1736 ch->ccw[10].cmd_code = CCW_CMD_READ;
1737 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1738 ch->ccw[10].count = XID2_LENGTH;
1739 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1740
1741 if (ch->xid_th == NULL)
1742 goto done;
1743 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1744 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1745 ch->ccw[11].count = TH_HEADER_LENGTH;
1746 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1747
1748 if (ch->xid == NULL)
1749 goto done;
1750 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1751 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1752 ch->ccw[12].count = XID2_LENGTH;
1753 ch->ccw[12].cda = virt_to_phys(ch->xid);
1754
1755 if (ch->xid_id == NULL)
1756 goto done;
1757 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1758 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1759
1760 }
1761 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1762 ch->ccw[13].count = 4;
1763
1764 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1765 ch->ccw[14].flags = CCW_FLAG_SLI;
1766 ch->ccw[14].count = 0;
1767 ch->ccw[14].cda = 0;
1768
1769 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1770 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1771 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1772 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1773
1774 if (!in_hardirq()) {
1775 /* Such conditional locking is a known problem for
1776 * sparse because its static undeterministic.
1777 * Warnings should be ignored here. */
1778 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1779 gotlock = 1;
1780 }
1781
1782 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1783 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1784
1785 if (gotlock) /* see remark above about conditional locking */
1786 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1787
1788 if (rc != 0) {
1789 ctcm_ccw_check_rc(ch, rc,
1790 (side == XSIDE) ? "x-side XID" : "y-side XID");
1791 }
1792
1793 done:
1794 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1795 __func__, ch, ch->id);
1796 return;
1797
1798 }
1799
1800 /*
1801 * MPC Group Station FSM action
1802 * CTCM_PROTO_MPC only
1803 */
mpc_action_xside_xid(fsm_instance * fsm,int event,void * arg)1804 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1805 {
1806 mpc_action_side_xid(fsm, arg, XSIDE);
1807 }
1808
1809 /*
1810 * MPC Group Station FSM action
1811 * CTCM_PROTO_MPC only
1812 */
mpc_action_yside_xid(fsm_instance * fsm,int event,void * arg)1813 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1814 {
1815 mpc_action_side_xid(fsm, arg, YSIDE);
1816 }
1817
1818 /*
1819 * MPC Group Station FSM action
1820 * CTCM_PROTO_MPC only
1821 */
mpc_action_doxid0(fsm_instance * fsm,int event,void * arg)1822 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1823 {
1824 struct channel *ch = arg;
1825 struct net_device *dev = ch->netdev;
1826 struct ctcm_priv *priv = dev->ml_priv;
1827 struct mpc_group *grp = priv->mpcg;
1828
1829 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1830 __func__, smp_processor_id(), ch, ch->id);
1831
1832 if (ch->xid == NULL) {
1833 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1834 "%s(%s): ch->xid == NULL",
1835 CTCM_FUNTAIL, dev->name);
1836 return;
1837 }
1838
1839 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1840
1841 ch->xid->xid2_option = XID2_0;
1842
1843 switch (fsm_getstate(grp->fsm)) {
1844 case MPCG_STATE_XID2INITW:
1845 case MPCG_STATE_XID2INITX:
1846 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1847 break;
1848 case MPCG_STATE_XID0IOWAIT:
1849 case MPCG_STATE_XID0IOWAIX:
1850 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1851 break;
1852 }
1853
1854 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1855
1856 return;
1857 }
1858
1859 /*
1860 * MPC Group Station FSM action
1861 * CTCM_PROTO_MPC only
1862 */
mpc_action_doxid7(fsm_instance * fsm,int event,void * arg)1863 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1864 {
1865 struct net_device *dev = arg;
1866 struct ctcm_priv *priv = dev->ml_priv;
1867 struct mpc_group *grp = NULL;
1868 int direction;
1869 int send = 0;
1870
1871 if (priv)
1872 grp = priv->mpcg;
1873 if (grp == NULL)
1874 return;
1875
1876 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1877 struct channel *ch = priv->channel[direction];
1878 struct xid2 *thisxid = ch->xid;
1879 ch->xid_skb->data = ch->xid_skb_data;
1880 skb_reset_tail_pointer(ch->xid_skb);
1881 ch->xid_skb->len = 0;
1882 thisxid->xid2_option = XID2_7;
1883 send = 0;
1884
1885 /* xid7 phase 1 */
1886 if (grp->outstanding_xid7_p2 > 0) {
1887 if (grp->roll == YSIDE) {
1888 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1889 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1890 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1891 skb_put_data(ch->xid_skb, &thdummy,
1892 TH_HEADER_LENGTH);
1893 send = 1;
1894 }
1895 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1896 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1897 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1898 skb_put_data(ch->xid_skb, &thnorm,
1899 TH_HEADER_LENGTH);
1900 send = 1;
1901 }
1902 } else {
1903 /* xid7 phase 2 */
1904 if (grp->roll == YSIDE) {
1905 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1906 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1907 skb_put_data(ch->xid_skb, &thnorm,
1908 TH_HEADER_LENGTH);
1909 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1910 send = 1;
1911 }
1912 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1913 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1914 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1915 skb_put_data(ch->xid_skb, &thdummy,
1916 TH_HEADER_LENGTH);
1917 send = 1;
1918 }
1919 }
1920
1921 if (send)
1922 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1923 }
1924
1925 return;
1926 }
1927
1928 /*
1929 * MPC Group Station FSM action
1930 * CTCM_PROTO_MPC only
1931 */
mpc_action_rcvd_xid0(fsm_instance * fsm,int event,void * arg)1932 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1933 {
1934
1935 struct mpcg_info *mpcginfo = arg;
1936 struct channel *ch = mpcginfo->ch;
1937 struct net_device *dev = ch->netdev;
1938 struct ctcm_priv *priv = dev->ml_priv;
1939 struct mpc_group *grp = priv->mpcg;
1940
1941 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1942 __func__, ch->id, grp->outstanding_xid2,
1943 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1944
1945 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1946 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1947
1948 grp->outstanding_xid2--;
1949 grp->outstanding_xid7++;
1950 grp->outstanding_xid7_p2++;
1951
1952 /* must change state before validating xid to */
1953 /* properly handle interim interrupts received*/
1954 switch (fsm_getstate(grp->fsm)) {
1955 case MPCG_STATE_XID2INITW:
1956 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1957 mpc_validate_xid(mpcginfo);
1958 break;
1959 case MPCG_STATE_XID0IOWAIT:
1960 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1961 mpc_validate_xid(mpcginfo);
1962 break;
1963 case MPCG_STATE_XID2INITX:
1964 if (grp->outstanding_xid2 == 0) {
1965 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1966 mpc_validate_xid(mpcginfo);
1967 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1968 }
1969 break;
1970 case MPCG_STATE_XID0IOWAIX:
1971 if (grp->outstanding_xid2 == 0) {
1972 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1973 mpc_validate_xid(mpcginfo);
1974 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1975 }
1976 break;
1977 }
1978
1979 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1980 __func__, ch->id, grp->outstanding_xid2,
1981 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1982 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1983 __func__, ch->id,
1984 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1985 return;
1986
1987 }
1988
1989
1990 /*
1991 * MPC Group Station FSM action
1992 * CTCM_PROTO_MPC only
1993 */
mpc_action_rcvd_xid7(fsm_instance * fsm,int event,void * arg)1994 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
1995 {
1996 struct mpcg_info *mpcginfo = arg;
1997 struct channel *ch = mpcginfo->ch;
1998 struct net_device *dev = ch->netdev;
1999 struct ctcm_priv *priv = dev->ml_priv;
2000 struct mpc_group *grp = priv->mpcg;
2001
2002 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2003 __func__, smp_processor_id(), ch, ch->id);
2004 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2005 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2006
2007 grp->outstanding_xid7--;
2008 ch->xid_skb->data = ch->xid_skb_data;
2009 skb_reset_tail_pointer(ch->xid_skb);
2010 ch->xid_skb->len = 0;
2011
2012 switch (fsm_getstate(grp->fsm)) {
2013 case MPCG_STATE_XID7INITI:
2014 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2015 mpc_validate_xid(mpcginfo);
2016 break;
2017 case MPCG_STATE_XID7INITW:
2018 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2019 mpc_validate_xid(mpcginfo);
2020 break;
2021 case MPCG_STATE_XID7INITZ:
2022 case MPCG_STATE_XID7INITX:
2023 if (grp->outstanding_xid7 == 0) {
2024 if (grp->outstanding_xid7_p2 > 0) {
2025 grp->outstanding_xid7 =
2026 grp->outstanding_xid7_p2;
2027 grp->outstanding_xid7_p2 = 0;
2028 } else
2029 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2030
2031 mpc_validate_xid(mpcginfo);
2032 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2033 break;
2034 }
2035 mpc_validate_xid(mpcginfo);
2036 break;
2037 }
2038 return;
2039 }
2040
2041 /*
2042 * mpc_action helper of an MPC Group Station FSM action
2043 * CTCM_PROTO_MPC only
2044 */
mpc_send_qllc_discontact(struct net_device * dev)2045 static int mpc_send_qllc_discontact(struct net_device *dev)
2046 {
2047 struct sk_buff *skb;
2048 struct qllc *qllcptr;
2049 struct ctcm_priv *priv = dev->ml_priv;
2050 struct mpc_group *grp = priv->mpcg;
2051
2052 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2053 __func__, mpcg_state_names[grp->saved_state]);
2054
2055 switch (grp->saved_state) {
2056 /*
2057 * establish conn callback function is
2058 * preferred method to report failure
2059 */
2060 case MPCG_STATE_XID0IOWAIT:
2061 case MPCG_STATE_XID0IOWAIX:
2062 case MPCG_STATE_XID7INITI:
2063 case MPCG_STATE_XID7INITZ:
2064 case MPCG_STATE_XID2INITW:
2065 case MPCG_STATE_XID2INITX:
2066 case MPCG_STATE_XID7INITW:
2067 case MPCG_STATE_XID7INITX:
2068 if (grp->estconnfunc) {
2069 grp->estconnfunc(grp->port_num, -1, 0);
2070 grp->estconnfunc = NULL;
2071 break;
2072 }
2073 fallthrough;
2074 case MPCG_STATE_FLOWC:
2075 case MPCG_STATE_READY:
2076 grp->send_qllc_disc = 2;
2077
2078 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2079 if (skb == NULL) {
2080 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2081 "%s(%s): skb allocation error",
2082 CTCM_FUNTAIL, dev->name);
2083 priv->stats.rx_dropped++;
2084 return -ENOMEM;
2085 }
2086
2087 qllcptr = skb_put(skb, sizeof(struct qllc));
2088 qllcptr->qllc_address = 0xcc;
2089 qllcptr->qllc_commands = 0x03;
2090
2091 if (skb_headroom(skb) < 4) {
2092 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2093 "%s(%s): skb_headroom error",
2094 CTCM_FUNTAIL, dev->name);
2095 dev_kfree_skb_any(skb);
2096 return -ENOMEM;
2097 }
2098
2099 *((__u32 *)skb_push(skb, 4)) =
2100 priv->channel[CTCM_READ]->pdu_seq;
2101 priv->channel[CTCM_READ]->pdu_seq++;
2102 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2103 __func__, priv->channel[CTCM_READ]->pdu_seq);
2104
2105 /* receipt of CC03 resets anticipated sequence number on
2106 receiving side */
2107 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2108 skb_reset_mac_header(skb);
2109 skb->dev = dev;
2110 skb->protocol = htons(ETH_P_SNAP);
2111 skb->ip_summed = CHECKSUM_UNNECESSARY;
2112
2113 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2114
2115 netif_rx(skb);
2116 break;
2117 default:
2118 break;
2119
2120 }
2121
2122 return 0;
2123 }
2124 /* --- This is the END my friend --- */
2125
2126