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
903 grp->send_qllc_disc = 1;
904 grp->changed_side = 0;
905
906 return;
907
908 }
909
910 /*
911 * Increment the MPC Group Active Channel Counts
912 * helper of dev_action (called from channel fsm)
913 */
mpc_channel_action(struct channel * ch,int direction,int action)914 void mpc_channel_action(struct channel *ch, int direction, int action)
915 {
916 struct net_device *dev = ch->netdev;
917 struct ctcm_priv *priv = dev->ml_priv;
918 struct mpc_group *grp = priv->mpcg;
919
920 if (grp == NULL) {
921 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
922 "%s(%s): No MPC group",
923 CTCM_FUNTAIL, dev->name);
924 return;
925 }
926
927 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
928
929 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
930 "%s: %i / Grp:%s total_channels=%i, active_channels: "
931 "read=%i, write=%i\n", __func__, action,
932 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
933 grp->active_channels[CTCM_READ],
934 grp->active_channels[CTCM_WRITE]);
935
936 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
937 grp->num_channel_paths++;
938 grp->active_channels[direction]++;
939 grp->outstanding_xid2++;
940 ch->in_mpcgroup = 1;
941
942 if (ch->xid_skb != NULL)
943 dev_kfree_skb_any(ch->xid_skb);
944
945 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
946 GFP_ATOMIC | GFP_DMA);
947 if (ch->xid_skb == NULL) {
948 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
949 "%s(%s): Couldn't alloc ch xid_skb\n",
950 CTCM_FUNTAIL, dev->name);
951 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
952 return;
953 }
954 ch->xid_skb_data = ch->xid_skb->data;
955 ch->xid_th = (struct th_header *)ch->xid_skb->data;
956 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
957 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
958 skb_put(ch->xid_skb, XID2_LENGTH);
959 ch->xid_id = skb_tail_pointer(ch->xid_skb);
960 ch->xid_skb->data = ch->xid_skb_data;
961 skb_reset_tail_pointer(ch->xid_skb);
962 ch->xid_skb->len = 0;
963
964 skb_put_data(ch->xid_skb, grp->xid_skb->data,
965 grp->xid_skb->len);
966
967 ch->xid->xid2_dlc_type =
968 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
969 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
970
971 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
972 ch->xid->xid2_buf_len = 0x00;
973
974 ch->xid_skb->data = ch->xid_skb_data;
975 skb_reset_tail_pointer(ch->xid_skb);
976 ch->xid_skb->len = 0;
977
978 fsm_newstate(ch->fsm, CH_XID0_PENDING);
979
980 if ((grp->active_channels[CTCM_READ] > 0) &&
981 (grp->active_channels[CTCM_WRITE] > 0) &&
982 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
983 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
984 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
985 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
986 __func__, dev->name);
987 }
988 } else if ((action == MPC_CHANNEL_REMOVE) &&
989 (ch->in_mpcgroup == 1)) {
990 ch->in_mpcgroup = 0;
991 grp->num_channel_paths--;
992 grp->active_channels[direction]--;
993
994 if (ch->xid_skb != NULL)
995 dev_kfree_skb_any(ch->xid_skb);
996 ch->xid_skb = NULL;
997
998 if (grp->channels_terminating)
999 goto done;
1000
1001 if (((grp->active_channels[CTCM_READ] == 0) &&
1002 (grp->active_channels[CTCM_WRITE] > 0))
1003 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1004 (grp->active_channels[CTCM_READ] > 0)))
1005 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1006 }
1007 done:
1008 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1009 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1010 "read=%i, write=%i\n", __func__, action,
1011 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1012 grp->active_channels[CTCM_READ],
1013 grp->active_channels[CTCM_WRITE]);
1014
1015 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1016 }
1017
1018 /*
1019 * Unpack a just received skb and hand it over to
1020 * upper layers.
1021 * special MPC version of unpack_skb.
1022 *
1023 * ch The channel where this skb has been received.
1024 * pskb The received skb.
1025 */
ctcmpc_unpack_skb(struct channel * ch,struct sk_buff * pskb)1026 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1027 {
1028 struct net_device *dev = ch->netdev;
1029 struct ctcm_priv *priv = dev->ml_priv;
1030 struct mpc_group *grp = priv->mpcg;
1031 struct pdu *curr_pdu;
1032 struct mpcg_info *mpcginfo;
1033 struct th_header *header = NULL;
1034 struct th_sweep *sweep = NULL;
1035 int pdu_last_seen = 0;
1036 __u32 new_len;
1037 struct sk_buff *skb;
1038 int skblen;
1039 int sendrc = 0;
1040
1041 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1042 __func__, dev->name, smp_processor_id(), ch->id);
1043
1044 header = (struct th_header *)pskb->data;
1045 if ((header->th_seg == 0) &&
1046 (header->th_ch_flag == 0) &&
1047 (header->th_blk_flag == 0) &&
1048 (header->th_seq_num == 0))
1049 /* nothing for us */ goto done;
1050
1051 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1052 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1053 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1054
1055 pskb->dev = dev;
1056 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1057 skb_pull(pskb, TH_HEADER_LENGTH);
1058
1059 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1060 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1061 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1062 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1063 (header->th_seq_num != ch->th_seq_num + 1) &&
1064 (ch->th_seq_num != 0))) {
1065 /* This is NOT the next segment *
1066 * we are not the correct race winner *
1067 * go away and let someone else win *
1068 * BUT..this only applies if xid negot *
1069 * is done *
1070 */
1071 grp->out_of_sequence += 1;
1072 __skb_push(pskb, TH_HEADER_LENGTH);
1073 skb_queue_tail(&ch->io_queue, pskb);
1074 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1075 "got:%08x\n", __func__,
1076 ch->th_seq_num + 1, header->th_seq_num);
1077
1078 return;
1079 }
1080 grp->out_of_sequence = 0;
1081 ch->th_seq_num = header->th_seq_num;
1082
1083 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1084 __func__, ch->th_seq_num);
1085
1086 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1087 goto done;
1088 while ((pskb->len > 0) && !pdu_last_seen) {
1089 curr_pdu = (struct pdu *)pskb->data;
1090
1091 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1092 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1093 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1094 __func__, pskb->len);
1095
1096 skb_pull(pskb, PDU_HEADER_LENGTH);
1097
1098 if (curr_pdu->pdu_flag & PDU_LAST)
1099 pdu_last_seen = 1;
1100 if (curr_pdu->pdu_flag & PDU_CNTL)
1101 pskb->protocol = htons(ETH_P_SNAP);
1102 else
1103 pskb->protocol = htons(ETH_P_SNA_DIX);
1104
1105 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1106 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1107 "%s(%s): Dropping packet with "
1108 "illegal siize %d",
1109 CTCM_FUNTAIL, dev->name, pskb->len);
1110
1111 priv->stats.rx_dropped++;
1112 priv->stats.rx_length_errors++;
1113 goto done;
1114 }
1115 skb_reset_mac_header(pskb);
1116 new_len = curr_pdu->pdu_offset;
1117 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1118 __func__, new_len);
1119 if ((new_len == 0) || (new_len > pskb->len)) {
1120 /* should never happen */
1121 /* pskb len must be hosed...bail out */
1122 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1123 "%s(%s): non valid pdu_offset: %04x",
1124 /* "data may be lost", */
1125 CTCM_FUNTAIL, dev->name, new_len);
1126 goto done;
1127 }
1128 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1129
1130 if (!skb) {
1131 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1132 "%s(%s): MEMORY allocation error",
1133 CTCM_FUNTAIL, dev->name);
1134 priv->stats.rx_dropped++;
1135 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1136 goto done;
1137 }
1138 skb_put_data(skb, pskb->data, new_len);
1139
1140 skb_reset_mac_header(skb);
1141 skb->dev = pskb->dev;
1142 skb->protocol = pskb->protocol;
1143 skb->ip_summed = CHECKSUM_UNNECESSARY;
1144 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1145 ch->pdu_seq++;
1146
1147 if (do_debug_data) {
1148 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1149 __func__, ch->pdu_seq);
1150 ctcm_pr_debug("%s: skb:%0lx "
1151 "skb len: %d \n", __func__,
1152 (unsigned long)skb, skb->len);
1153 ctcm_pr_debug("%s: up to 32 bytes "
1154 "of pdu_data sent\n", __func__);
1155 ctcmpc_dump32((char *)skb->data, skb->len);
1156 }
1157
1158 skblen = skb->len;
1159 sendrc = netif_rx(skb);
1160 priv->stats.rx_packets++;
1161 priv->stats.rx_bytes += skblen;
1162 skb_pull(pskb, new_len); /* point to next PDU */
1163 }
1164 } else {
1165 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1166 if (mpcginfo == NULL)
1167 goto done;
1168
1169 mpcginfo->ch = ch;
1170 mpcginfo->th = header;
1171 mpcginfo->skb = pskb;
1172 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1173 __func__);
1174 /* it's a sweep? */
1175 sweep = (struct th_sweep *)pskb->data;
1176 mpcginfo->sweep = sweep;
1177 if (header->th_ch_flag == TH_SWEEP_REQ)
1178 mpc_rcvd_sweep_req(mpcginfo);
1179 else if (header->th_ch_flag == TH_SWEEP_RESP)
1180 mpc_rcvd_sweep_resp(mpcginfo);
1181 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1182 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1183 skb_pull(pskb, XID2_LENGTH);
1184 mpcginfo->xid = thisxid;
1185 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1186 } else if (header->th_blk_flag == TH_DISCONTACT)
1187 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1188 else if (header->th_seq_num != 0) {
1189 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1190 "%s(%s): control pkt expected\n",
1191 CTCM_FUNTAIL, dev->name);
1192 priv->stats.rx_dropped++;
1193 /* mpcginfo only used for non-data transfers */
1194 if (do_debug_data)
1195 ctcmpc_dump_skb(pskb, -8);
1196 }
1197 kfree(mpcginfo);
1198 }
1199 done:
1200
1201 dev_kfree_skb_any(pskb);
1202 if (sendrc == NET_RX_DROP) {
1203 dev_warn(&dev->dev,
1204 "The network backlog for %s is exceeded, "
1205 "package dropped\n", __func__);
1206 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1207 }
1208
1209 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1210 __func__, dev->name, ch, ch->id);
1211 }
1212
1213 /*
1214 * tasklet helper for mpc's skb unpacking.
1215 *
1216 * ch The channel to work on.
1217 * Allow flow control back pressure to occur here.
1218 * Throttling back channel can result in excessive
1219 * channel inactivity and system deact of channel
1220 */
ctcmpc_bh(unsigned long thischan)1221 void ctcmpc_bh(unsigned long thischan)
1222 {
1223 struct channel *ch = (struct channel *)thischan;
1224 struct sk_buff *skb;
1225 struct net_device *dev = ch->netdev;
1226 struct ctcm_priv *priv = dev->ml_priv;
1227 struct mpc_group *grp = priv->mpcg;
1228
1229 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1230 dev->name, smp_processor_id(), __func__, ch->id);
1231 /* caller has requested driver to throttle back */
1232 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1233 (skb = skb_dequeue(&ch->io_queue))) {
1234 ctcmpc_unpack_skb(ch, skb);
1235 if (grp->out_of_sequence > 20) {
1236 /* assume data loss has occurred if */
1237 /* missing seq_num for extended */
1238 /* period of time */
1239 grp->out_of_sequence = 0;
1240 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1241 break;
1242 }
1243 if (skb == skb_peek(&ch->io_queue))
1244 break;
1245 }
1246 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1247 __func__, dev->name, ch, ch->id);
1248 return;
1249 }
1250
1251 /*
1252 * MPC Group Initializations
1253 */
ctcmpc_init_mpc_group(struct ctcm_priv * priv)1254 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1255 {
1256 struct mpc_group *grp;
1257
1258 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1259 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1260
1261 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1262 if (grp == NULL)
1263 return NULL;
1264
1265 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1266 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1267 mpcg_fsm_len, GFP_KERNEL);
1268 if (grp->fsm == NULL) {
1269 kfree(grp);
1270 return NULL;
1271 }
1272
1273 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1274 fsm_settimer(grp->fsm, &grp->timer);
1275
1276 grp->xid_skb =
1277 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1278 if (grp->xid_skb == NULL) {
1279 kfree_fsm(grp->fsm);
1280 kfree(grp);
1281 return NULL;
1282 }
1283 /* base xid for all channels in group */
1284 grp->xid_skb_data = grp->xid_skb->data;
1285 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1286 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1287
1288 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1289 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1290 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1291 grp->xid->xid2_sender_id = jiffies;
1292
1293 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1294 skb_put_data(grp->xid_skb, "VTAM", 4);
1295
1296 grp->rcvd_xid_skb =
1297 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1298 if (grp->rcvd_xid_skb == NULL) {
1299 kfree_fsm(grp->fsm);
1300 dev_kfree_skb(grp->xid_skb);
1301 kfree(grp);
1302 return NULL;
1303 }
1304 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1305 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1306 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1307 grp->saved_xid2 = NULL;
1308 priv->xid = grp->xid;
1309 priv->mpcg = grp;
1310 return grp;
1311 }
1312
1313 /*
1314 * The MPC Group Station FSM
1315 */
1316
1317 /*
1318 * MPC Group Station FSM actions
1319 * CTCM_PROTO_MPC only
1320 */
1321
1322 /*
1323 * NOP action for statemachines
1324 */
mpc_action_nop(fsm_instance * fi,int event,void * arg)1325 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1326 {
1327 }
1328
1329 /*
1330 * invoked when the device transitions to dev_stopped
1331 * MPC will stop each individual channel if a single XID failure
1332 * occurs, or will intitiate all channels be stopped if a GROUP
1333 * level failure occurs.
1334 */
mpc_action_go_inop(fsm_instance * fi,int event,void * arg)1335 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1336 {
1337 struct net_device *dev = arg;
1338 struct ctcm_priv *priv;
1339 struct mpc_group *grp;
1340 struct channel *wch;
1341
1342 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1343
1344 priv = dev->ml_priv;
1345 grp = priv->mpcg;
1346 grp->flow_off_called = 0;
1347 fsm_deltimer(&grp->timer);
1348 if (grp->channels_terminating)
1349 return;
1350
1351 grp->channels_terminating = 1;
1352 grp->saved_state = fsm_getstate(grp->fsm);
1353 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1354 if (grp->saved_state > MPCG_STATE_XID7INITF)
1355 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1356 "%s(%s): MPC GROUP INOPERATIVE",
1357 CTCM_FUNTAIL, dev->name);
1358 if ((grp->saved_state != MPCG_STATE_RESET) ||
1359 /* dealloc_channel has been called */
1360 (grp->port_persist == 0))
1361 fsm_deltimer(&priv->restart_timer);
1362
1363 wch = priv->channel[CTCM_WRITE];
1364
1365 switch (grp->saved_state) {
1366 case MPCG_STATE_RESET:
1367 case MPCG_STATE_INOP:
1368 case MPCG_STATE_XID2INITW:
1369 case MPCG_STATE_XID0IOWAIT:
1370 case MPCG_STATE_XID2INITX:
1371 case MPCG_STATE_XID7INITW:
1372 case MPCG_STATE_XID7INITX:
1373 case MPCG_STATE_XID0IOWAIX:
1374 case MPCG_STATE_XID7INITI:
1375 case MPCG_STATE_XID7INITZ:
1376 case MPCG_STATE_XID7INITF:
1377 break;
1378 case MPCG_STATE_FLOWC:
1379 case MPCG_STATE_READY:
1380 default:
1381 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1382 }
1383
1384 grp->xid2_tgnum = 0;
1385 grp->group_max_buflen = 0; /*min of all received */
1386 grp->outstanding_xid2 = 0;
1387 grp->outstanding_xid7 = 0;
1388 grp->outstanding_xid7_p2 = 0;
1389 grp->saved_xid2 = NULL;
1390 grp->xidnogood = 0;
1391 grp->changed_side = 0;
1392
1393 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1394 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1395 grp->rcvd_xid_skb->len = 0;
1396 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1397 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1398
1399 if (grp->send_qllc_disc == 1) {
1400 grp->send_qllc_disc = 0;
1401 mpc_send_qllc_discontact(dev);
1402 }
1403
1404 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1405 /* This can result in INOP of VTAM PU due to halting of */
1406 /* outstanding IO which causes a sense to be returned */
1407 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1408 /* become unreachable without manual intervention */
1409 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1410 grp->alloc_called = 0;
1411 fsm_deltimer(&priv->restart_timer);
1412 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1413 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1414 if (grp->saved_state > MPCG_STATE_XID7INITF)
1415 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1416 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1417 CTCM_FUNTAIL, dev->name);
1418 } else {
1419 fsm_deltimer(&priv->restart_timer);
1420 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1421 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1422 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1423 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1424 CTCM_FUNTAIL, dev->name);
1425 }
1426 }
1427
1428 /*
1429 * Handle mpc group action timeout.
1430 * MPC Group Station FSM action
1431 * CTCM_PROTO_MPC only
1432 *
1433 * fi An instance of an mpc_group fsm.
1434 * event The event, just happened.
1435 * arg Generic pointer, casted from net_device * upon call.
1436 */
mpc_action_timeout(fsm_instance * fi,int event,void * arg)1437 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1438 {
1439 struct net_device *dev = arg;
1440 struct ctcm_priv *priv;
1441 struct mpc_group *grp;
1442 struct channel *wch;
1443 struct channel *rch;
1444
1445 priv = dev->ml_priv;
1446 grp = priv->mpcg;
1447 wch = priv->channel[CTCM_WRITE];
1448 rch = priv->channel[CTCM_READ];
1449
1450 switch (fsm_getstate(grp->fsm)) {
1451 case MPCG_STATE_XID2INITW:
1452 /* Unless there is outstanding IO on the */
1453 /* channel just return and wait for ATTN */
1454 /* interrupt to begin XID negotiations */
1455 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1456 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1457 break;
1458 fallthrough;
1459 default:
1460 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1461 }
1462
1463 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1464 "%s: dev=%s exit",
1465 CTCM_FUNTAIL, dev->name);
1466 return;
1467 }
1468
1469 /*
1470 * MPC Group Station FSM action
1471 * CTCM_PROTO_MPC only
1472 */
mpc_action_discontact(fsm_instance * fi,int event,void * arg)1473 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1474 {
1475 struct mpcg_info *mpcginfo = arg;
1476 struct channel *ch = mpcginfo->ch;
1477 struct net_device *dev;
1478 struct ctcm_priv *priv;
1479 struct mpc_group *grp;
1480
1481 if (ch) {
1482 dev = ch->netdev;
1483 if (dev) {
1484 priv = dev->ml_priv;
1485 if (priv) {
1486 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1487 "%s: %s: %s\n",
1488 CTCM_FUNTAIL, dev->name, ch->id);
1489 grp = priv->mpcg;
1490 grp->send_qllc_disc = 1;
1491 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1492 }
1493 }
1494 }
1495
1496 return;
1497 }
1498
1499 /*
1500 * MPC Group Station - not part of FSM
1501 * CTCM_PROTO_MPC only
1502 * called from add_channel in ctcm_main.c
1503 */
mpc_action_send_discontact(unsigned long thischan)1504 void mpc_action_send_discontact(unsigned long thischan)
1505 {
1506 int rc;
1507 struct channel *ch = (struct channel *)thischan;
1508 unsigned long saveflags = 0;
1509
1510 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1511 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1512 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1513
1514 if (rc != 0) {
1515 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1516 }
1517
1518 return;
1519 }
1520
1521
1522 /*
1523 * helper function of mpc FSM
1524 * CTCM_PROTO_MPC only
1525 * mpc_action_rcvd_xid7
1526 */
mpc_validate_xid(struct mpcg_info * mpcginfo)1527 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1528 {
1529 struct channel *ch = mpcginfo->ch;
1530 struct net_device *dev = ch->netdev;
1531 struct ctcm_priv *priv = dev->ml_priv;
1532 struct mpc_group *grp = priv->mpcg;
1533 struct xid2 *xid = mpcginfo->xid;
1534 int rc = 0;
1535 __u64 our_id = 0;
1536 __u64 their_id = 0;
1537 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1538
1539 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1540
1541 if (xid == NULL) {
1542 rc = 1;
1543 /* XID REJECTED: xid == NULL */
1544 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1545 "%s(%s): xid = NULL",
1546 CTCM_FUNTAIL, ch->id);
1547 goto done;
1548 }
1549
1550 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1551
1552 /*the received direction should be the opposite of ours */
1553 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1554 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1555 rc = 2;
1556 /* XID REJECTED: r/w channel pairing mismatch */
1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1558 "%s(%s): r/w channel pairing mismatch",
1559 CTCM_FUNTAIL, ch->id);
1560 goto done;
1561 }
1562
1563 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1564 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1565 grp->group_max_buflen, xid->xid2_buf_len);
1566
1567 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1568 xid->xid2_buf_len - len)
1569 grp->group_max_buflen = xid->xid2_buf_len - len;
1570 }
1571
1572 if (grp->saved_xid2 == NULL) {
1573 grp->saved_xid2 =
1574 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1575
1576 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1577 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1578
1579 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1580 grp->rcvd_xid_skb->len = 0;
1581
1582 /* convert two 32 bit numbers into 1 64 bit for id compare */
1583 our_id = (__u64)priv->xid->xid2_adj_id;
1584 our_id = our_id << 32;
1585 our_id = our_id + priv->xid->xid2_sender_id;
1586 their_id = (__u64)xid->xid2_adj_id;
1587 their_id = their_id << 32;
1588 their_id = their_id + xid->xid2_sender_id;
1589 /* lower id assume the xside role */
1590 if (our_id < their_id) {
1591 grp->roll = XSIDE;
1592 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1593 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1594 CTCM_FUNTAIL, ch->id);
1595 } else {
1596 grp->roll = YSIDE;
1597 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1598 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1599 CTCM_FUNTAIL, ch->id);
1600 }
1601
1602 } else {
1603 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1604 rc = 3;
1605 /* XID REJECTED: xid flag byte4 mismatch */
1606 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1607 "%s(%s): xid flag byte4 mismatch",
1608 CTCM_FUNTAIL, ch->id);
1609 }
1610 if (xid->xid2_flag2 == 0x40) {
1611 rc = 4;
1612 /* XID REJECTED - xid NOGOOD */
1613 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1614 "%s(%s): xid NOGOOD",
1615 CTCM_FUNTAIL, ch->id);
1616 }
1617 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1618 rc = 5;
1619 /* XID REJECTED - Adjacent Station ID Mismatch */
1620 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1621 "%s(%s): Adjacent Station ID Mismatch",
1622 CTCM_FUNTAIL, ch->id);
1623 }
1624 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1625 rc = 6;
1626 /* XID REJECTED - Sender Address Mismatch */
1627 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1628 "%s(%s): Sender Address Mismatch",
1629 CTCM_FUNTAIL, ch->id);
1630 }
1631 }
1632 done:
1633 if (rc) {
1634 dev_warn(&dev->dev,
1635 "The XID used in the MPC protocol is not valid, "
1636 "rc = %d\n", rc);
1637 priv->xid->xid2_flag2 = 0x40;
1638 grp->saved_xid2->xid2_flag2 = 0x40;
1639 }
1640
1641 return rc;
1642 }
1643
1644 /*
1645 * MPC Group Station FSM action
1646 * CTCM_PROTO_MPC only
1647 */
mpc_action_side_xid(fsm_instance * fsm,void * arg,int side)1648 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1649 {
1650 struct channel *ch = arg;
1651 int rc = 0;
1652 int gotlock = 0;
1653 unsigned long saveflags = 0; /* avoids compiler warning with
1654 spin_unlock_irqrestore */
1655
1656 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1657 __func__, smp_processor_id(), ch, ch->id);
1658
1659 if (ctcm_checkalloc_buffer(ch))
1660 goto done;
1661
1662 /*
1663 * skb data-buffer referencing:
1664 */
1665 ch->trans_skb->data = ch->trans_skb_data;
1666 skb_reset_tail_pointer(ch->trans_skb);
1667 ch->trans_skb->len = 0;
1668 /* result of the previous 3 statements is NOT always
1669 * already set after ctcm_checkalloc_buffer
1670 * because of possible reuse of the trans_skb
1671 */
1672 memset(ch->trans_skb->data, 0, 16);
1673 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1674 /* check is main purpose here: */
1675 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1676 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1677 /* check is main purpose here: */
1678 skb_put(ch->trans_skb, XID2_LENGTH);
1679 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1680 /* cleanup back to startpoint */
1681 ch->trans_skb->data = ch->trans_skb_data;
1682 skb_reset_tail_pointer(ch->trans_skb);
1683 ch->trans_skb->len = 0;
1684
1685 /* non-checking rewrite of above skb data-buffer referencing: */
1686 /*
1687 memset(ch->trans_skb->data, 0, 16);
1688 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1689 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1690 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1691 */
1692
1693 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1694 ch->ccw[8].count = 0;
1695 ch->ccw[8].cda = 0x00;
1696
1697 if (!(ch->xid_th && ch->xid && ch->xid_id))
1698 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1699 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1700 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1701
1702 if (side == XSIDE) {
1703 /* mpc_action_xside_xid */
1704 if (ch->xid_th == NULL)
1705 goto done;
1706 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1707 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1708 ch->ccw[9].count = TH_HEADER_LENGTH;
1709 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1710
1711 if (ch->xid == NULL)
1712 goto done;
1713 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1714 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1715 ch->ccw[10].count = XID2_LENGTH;
1716 ch->ccw[10].cda = virt_to_phys(ch->xid);
1717
1718 ch->ccw[11].cmd_code = CCW_CMD_READ;
1719 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1720 ch->ccw[11].count = TH_HEADER_LENGTH;
1721 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1722
1723 ch->ccw[12].cmd_code = CCW_CMD_READ;
1724 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1725 ch->ccw[12].count = XID2_LENGTH;
1726 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1727
1728 ch->ccw[13].cmd_code = CCW_CMD_READ;
1729 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1730
1731 } else { /* side == YSIDE : mpc_action_yside_xid */
1732 ch->ccw[9].cmd_code = CCW_CMD_READ;
1733 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1734 ch->ccw[9].count = TH_HEADER_LENGTH;
1735 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1736
1737 ch->ccw[10].cmd_code = CCW_CMD_READ;
1738 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1739 ch->ccw[10].count = XID2_LENGTH;
1740 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1741
1742 if (ch->xid_th == NULL)
1743 goto done;
1744 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1745 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1746 ch->ccw[11].count = TH_HEADER_LENGTH;
1747 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1748
1749 if (ch->xid == NULL)
1750 goto done;
1751 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1752 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1753 ch->ccw[12].count = XID2_LENGTH;
1754 ch->ccw[12].cda = virt_to_phys(ch->xid);
1755
1756 if (ch->xid_id == NULL)
1757 goto done;
1758 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1759 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1760
1761 }
1762 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1763 ch->ccw[13].count = 4;
1764
1765 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1766 ch->ccw[14].flags = CCW_FLAG_SLI;
1767 ch->ccw[14].count = 0;
1768 ch->ccw[14].cda = 0;
1769
1770 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1771 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1772 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1773 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1774
1775 if (!in_hardirq()) {
1776 /* Such conditional locking is a known problem for
1777 * sparse because its static undeterministic.
1778 * Warnings should be ignored here. */
1779 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1780 gotlock = 1;
1781 }
1782
1783 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1784 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1785
1786 if (gotlock) /* see remark above about conditional locking */
1787 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1788
1789 if (rc != 0) {
1790 ctcm_ccw_check_rc(ch, rc,
1791 (side == XSIDE) ? "x-side XID" : "y-side XID");
1792 }
1793
1794 done:
1795 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1796 __func__, ch, ch->id);
1797 return;
1798
1799 }
1800
1801 /*
1802 * MPC Group Station FSM action
1803 * CTCM_PROTO_MPC only
1804 */
mpc_action_xside_xid(fsm_instance * fsm,int event,void * arg)1805 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1806 {
1807 mpc_action_side_xid(fsm, arg, XSIDE);
1808 }
1809
1810 /*
1811 * MPC Group Station FSM action
1812 * CTCM_PROTO_MPC only
1813 */
mpc_action_yside_xid(fsm_instance * fsm,int event,void * arg)1814 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1815 {
1816 mpc_action_side_xid(fsm, arg, YSIDE);
1817 }
1818
1819 /*
1820 * MPC Group Station FSM action
1821 * CTCM_PROTO_MPC only
1822 */
mpc_action_doxid0(fsm_instance * fsm,int event,void * arg)1823 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1824 {
1825 struct channel *ch = arg;
1826 struct net_device *dev = ch->netdev;
1827 struct ctcm_priv *priv = dev->ml_priv;
1828 struct mpc_group *grp = priv->mpcg;
1829
1830 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1831 __func__, smp_processor_id(), ch, ch->id);
1832
1833 if (ch->xid == NULL) {
1834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1835 "%s(%s): ch->xid == NULL",
1836 CTCM_FUNTAIL, dev->name);
1837 return;
1838 }
1839
1840 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1841
1842 ch->xid->xid2_option = XID2_0;
1843
1844 switch (fsm_getstate(grp->fsm)) {
1845 case MPCG_STATE_XID2INITW:
1846 case MPCG_STATE_XID2INITX:
1847 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1848 break;
1849 case MPCG_STATE_XID0IOWAIT:
1850 case MPCG_STATE_XID0IOWAIX:
1851 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1852 break;
1853 }
1854
1855 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1856
1857 return;
1858 }
1859
1860 /*
1861 * MPC Group Station FSM action
1862 * CTCM_PROTO_MPC only
1863 */
mpc_action_doxid7(fsm_instance * fsm,int event,void * arg)1864 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1865 {
1866 struct net_device *dev = arg;
1867 struct ctcm_priv *priv = dev->ml_priv;
1868 struct mpc_group *grp = NULL;
1869 int direction;
1870 int send = 0;
1871
1872 if (priv)
1873 grp = priv->mpcg;
1874 if (grp == NULL)
1875 return;
1876
1877 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1878 struct channel *ch = priv->channel[direction];
1879 struct xid2 *thisxid = ch->xid;
1880 ch->xid_skb->data = ch->xid_skb_data;
1881 skb_reset_tail_pointer(ch->xid_skb);
1882 ch->xid_skb->len = 0;
1883 thisxid->xid2_option = XID2_7;
1884 send = 0;
1885
1886 /* xid7 phase 1 */
1887 if (grp->outstanding_xid7_p2 > 0) {
1888 if (grp->roll == YSIDE) {
1889 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1890 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1891 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1892 skb_put_data(ch->xid_skb, &thdummy,
1893 TH_HEADER_LENGTH);
1894 send = 1;
1895 }
1896 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1897 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1898 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1899 skb_put_data(ch->xid_skb, &thnorm,
1900 TH_HEADER_LENGTH);
1901 send = 1;
1902 }
1903 } else {
1904 /* xid7 phase 2 */
1905 if (grp->roll == YSIDE) {
1906 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1907 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1908 skb_put_data(ch->xid_skb, &thnorm,
1909 TH_HEADER_LENGTH);
1910 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1911 send = 1;
1912 }
1913 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1914 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1915 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1916 skb_put_data(ch->xid_skb, &thdummy,
1917 TH_HEADER_LENGTH);
1918 send = 1;
1919 }
1920 }
1921
1922 if (send)
1923 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1924 }
1925
1926 return;
1927 }
1928
1929 /*
1930 * MPC Group Station FSM action
1931 * CTCM_PROTO_MPC only
1932 */
mpc_action_rcvd_xid0(fsm_instance * fsm,int event,void * arg)1933 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1934 {
1935
1936 struct mpcg_info *mpcginfo = arg;
1937 struct channel *ch = mpcginfo->ch;
1938 struct net_device *dev = ch->netdev;
1939 struct ctcm_priv *priv = dev->ml_priv;
1940 struct mpc_group *grp = priv->mpcg;
1941
1942 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1943 __func__, ch->id, grp->outstanding_xid2,
1944 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1945
1946 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1947 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1948
1949 grp->outstanding_xid2--;
1950 grp->outstanding_xid7++;
1951 grp->outstanding_xid7_p2++;
1952
1953 /* must change state before validating xid to */
1954 /* properly handle interim interrupts received*/
1955 switch (fsm_getstate(grp->fsm)) {
1956 case MPCG_STATE_XID2INITW:
1957 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1958 mpc_validate_xid(mpcginfo);
1959 break;
1960 case MPCG_STATE_XID0IOWAIT:
1961 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1962 mpc_validate_xid(mpcginfo);
1963 break;
1964 case MPCG_STATE_XID2INITX:
1965 if (grp->outstanding_xid2 == 0) {
1966 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1967 mpc_validate_xid(mpcginfo);
1968 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1969 }
1970 break;
1971 case MPCG_STATE_XID0IOWAIX:
1972 if (grp->outstanding_xid2 == 0) {
1973 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1974 mpc_validate_xid(mpcginfo);
1975 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1976 }
1977 break;
1978 }
1979
1980 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1981 __func__, ch->id, grp->outstanding_xid2,
1982 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1983 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1984 __func__, ch->id,
1985 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1986 return;
1987
1988 }
1989
1990
1991 /*
1992 * MPC Group Station FSM action
1993 * CTCM_PROTO_MPC only
1994 */
mpc_action_rcvd_xid7(fsm_instance * fsm,int event,void * arg)1995 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
1996 {
1997 struct mpcg_info *mpcginfo = arg;
1998 struct channel *ch = mpcginfo->ch;
1999 struct net_device *dev = ch->netdev;
2000 struct ctcm_priv *priv = dev->ml_priv;
2001 struct mpc_group *grp = priv->mpcg;
2002
2003 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2004 __func__, smp_processor_id(), ch, ch->id);
2005 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2006 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2007
2008 grp->outstanding_xid7--;
2009 ch->xid_skb->data = ch->xid_skb_data;
2010 skb_reset_tail_pointer(ch->xid_skb);
2011 ch->xid_skb->len = 0;
2012
2013 switch (fsm_getstate(grp->fsm)) {
2014 case MPCG_STATE_XID7INITI:
2015 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2016 mpc_validate_xid(mpcginfo);
2017 break;
2018 case MPCG_STATE_XID7INITW:
2019 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2020 mpc_validate_xid(mpcginfo);
2021 break;
2022 case MPCG_STATE_XID7INITZ:
2023 case MPCG_STATE_XID7INITX:
2024 if (grp->outstanding_xid7 == 0) {
2025 if (grp->outstanding_xid7_p2 > 0) {
2026 grp->outstanding_xid7 =
2027 grp->outstanding_xid7_p2;
2028 grp->outstanding_xid7_p2 = 0;
2029 } else
2030 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2031
2032 mpc_validate_xid(mpcginfo);
2033 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2034 break;
2035 }
2036 mpc_validate_xid(mpcginfo);
2037 break;
2038 }
2039 return;
2040 }
2041
2042 /*
2043 * mpc_action helper of an MPC Group Station FSM action
2044 * CTCM_PROTO_MPC only
2045 */
mpc_send_qllc_discontact(struct net_device * dev)2046 static int mpc_send_qllc_discontact(struct net_device *dev)
2047 {
2048 struct sk_buff *skb;
2049 struct qllc *qllcptr;
2050 struct ctcm_priv *priv = dev->ml_priv;
2051 struct mpc_group *grp = priv->mpcg;
2052
2053 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2054 __func__, mpcg_state_names[grp->saved_state]);
2055
2056 switch (grp->saved_state) {
2057 /*
2058 * establish conn callback function is
2059 * preferred method to report failure
2060 */
2061 case MPCG_STATE_XID0IOWAIT:
2062 case MPCG_STATE_XID0IOWAIX:
2063 case MPCG_STATE_XID7INITI:
2064 case MPCG_STATE_XID7INITZ:
2065 case MPCG_STATE_XID2INITW:
2066 case MPCG_STATE_XID2INITX:
2067 case MPCG_STATE_XID7INITW:
2068 case MPCG_STATE_XID7INITX:
2069 if (grp->estconnfunc) {
2070 grp->estconnfunc(grp->port_num, -1, 0);
2071 grp->estconnfunc = NULL;
2072 break;
2073 }
2074 fallthrough;
2075 case MPCG_STATE_FLOWC:
2076 case MPCG_STATE_READY:
2077 grp->send_qllc_disc = 2;
2078
2079 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2080 if (skb == NULL) {
2081 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2082 "%s(%s): skb allocation error",
2083 CTCM_FUNTAIL, dev->name);
2084 priv->stats.rx_dropped++;
2085 return -ENOMEM;
2086 }
2087
2088 qllcptr = skb_put(skb, sizeof(struct qllc));
2089 qllcptr->qllc_address = 0xcc;
2090 qllcptr->qllc_commands = 0x03;
2091
2092 if (skb_headroom(skb) < 4) {
2093 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2094 "%s(%s): skb_headroom error",
2095 CTCM_FUNTAIL, dev->name);
2096 dev_kfree_skb_any(skb);
2097 return -ENOMEM;
2098 }
2099
2100 *((__u32 *)skb_push(skb, 4)) =
2101 priv->channel[CTCM_READ]->pdu_seq;
2102 priv->channel[CTCM_READ]->pdu_seq++;
2103 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2104 __func__, priv->channel[CTCM_READ]->pdu_seq);
2105
2106 /* receipt of CC03 resets anticipated sequence number on
2107 receiving side */
2108 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2109 skb_reset_mac_header(skb);
2110 skb->dev = dev;
2111 skb->protocol = htons(ETH_P_SNAP);
2112 skb->ip_summed = CHECKSUM_UNNECESSARY;
2113
2114 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2115
2116 netif_rx(skb);
2117 break;
2118 default:
2119 break;
2120
2121 }
2122
2123 return 0;
2124 }
2125 /* --- This is the END my friend --- */
2126
2127