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 = kmalloc(sizeof(struct th_sweep), gfp_type());
657
658 if (!header) {
659 dev_kfree_skb_any(sweep_skb);
660 goto done;
661 }
662
663 header->th.th_seg = 0x00 ;
664 header->th.th_ch_flag = TH_SWEEP_RESP;
665 header->th.th_blk_flag = 0x00;
666 header->th.th_is_xid = 0x00;
667 header->th.th_seq_num = 0x00;
668 header->sw.th_last_seq = ch->th_seq_num;
669
670 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
671
672 kfree(header);
673
674 netif_trans_update(dev);
675 skb_queue_tail(&ch->sweep_queue, sweep_skb);
676
677 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
678
679 return;
680
681 done:
682 grp->in_sweep = 0;
683 ctcm_clear_busy_do(dev);
684 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
685
686 return;
687 }
688
689 /*
690 * helper function of ctcmpc_unpack_skb
691 */
mpc_rcvd_sweep_req(struct mpcg_info * mpcginfo)692 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
693 {
694 struct channel *rch = mpcginfo->ch;
695 struct net_device *dev = rch->netdev;
696 struct ctcm_priv *priv = dev->ml_priv;
697 struct mpc_group *grp = priv->mpcg;
698 struct channel *ch = priv->channel[CTCM_WRITE];
699
700 if (do_debug)
701 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
702 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
703
704 if (grp->in_sweep == 0) {
705 grp->in_sweep = 1;
706 ctcm_test_and_set_busy(dev);
707 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
708 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
709 }
710
711 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
712
713 grp->sweep_req_pend_num--;
714 ctcmpc_send_sweep_resp(ch);
715 kfree(mpcginfo);
716 return;
717 }
718
719 /*
720 * MPC Group Station FSM definitions
721 */
722 static const char *mpcg_event_names[] = {
723 [MPCG_EVENT_INOP] = "INOP Condition",
724 [MPCG_EVENT_DISCONC] = "Discontact Received",
725 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
726 [MPCG_EVENT_XID2] = "XID2 Received",
727 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
728 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
729 [MPCG_EVENT_TIMER] = "XID Setup Timer",
730 [MPCG_EVENT_DOIO] = "XID DoIO",
731 };
732
733 static const char *mpcg_state_names[] = {
734 [MPCG_STATE_RESET] = "Reset",
735 [MPCG_STATE_INOP] = "INOP",
736 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
737 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
738 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
739 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
740 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
741 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
742 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
743 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
744 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
745 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
746 [MPCG_STATE_READY] = "READY",
747 };
748
749 /*
750 * The MPC Group Station FSM
751 * 22 events
752 */
753 static const fsm_node mpcg_fsm[] = {
754 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
755 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
756 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
757
758 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
759 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
760
761 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
763 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
764 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
765 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
766
767 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
769 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
770 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
771 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
772
773 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
774 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
775 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
776 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
777 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
778 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
779 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
780
781 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
782 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
783 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
784 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
785 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
786 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
787
788 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
794
795 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
801
802 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
804 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
805 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
806 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
807 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
808 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
809
810 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
816
817 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
818 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
819 };
820
821 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
822
823 /*
824 * MPC Group Station FSM action
825 * CTCM_PROTO_MPC only
826 */
mpc_action_go_ready(fsm_instance * fsm,int event,void * arg)827 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
828 {
829 struct net_device *dev = arg;
830 struct ctcm_priv *priv = dev->ml_priv;
831 struct mpc_group *grp = priv->mpcg;
832
833 if (grp == NULL) {
834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
835 "%s(%s): No MPC group",
836 CTCM_FUNTAIL, dev->name);
837 return;
838 }
839
840 fsm_deltimer(&grp->timer);
841
842 if (grp->saved_xid2->xid2_flag2 == 0x40) {
843 priv->xid->xid2_flag2 = 0x00;
844 if (grp->estconnfunc) {
845 grp->estconnfunc(grp->port_num, 1,
846 grp->group_max_buflen);
847 grp->estconnfunc = NULL;
848 } else if (grp->allochanfunc)
849 grp->send_qllc_disc = 1;
850
851 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
852 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
853 "%s(%s): fails",
854 CTCM_FUNTAIL, dev->name);
855 return;
856 }
857
858 grp->port_persist = 1;
859 grp->out_of_sequence = 0;
860 grp->estconn_called = 0;
861
862 tasklet_hi_schedule(&grp->mpc_tasklet2);
863
864 return;
865 }
866
867 /*
868 * helper of ctcm_init_netdevice
869 * CTCM_PROTO_MPC only
870 */
mpc_group_ready(unsigned long adev)871 void mpc_group_ready(unsigned long adev)
872 {
873 struct net_device *dev = (struct net_device *)adev;
874 struct ctcm_priv *priv = dev->ml_priv;
875 struct mpc_group *grp = priv->mpcg;
876 struct channel *ch = NULL;
877
878 if (grp == NULL) {
879 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
880 "%s(%s): No MPC group",
881 CTCM_FUNTAIL, dev->name);
882 return;
883 }
884
885 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
886 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
887 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
888
889 fsm_newstate(grp->fsm, MPCG_STATE_READY);
890
891 /* Put up a read on the channel */
892 ch = priv->channel[CTCM_READ];
893 ch->pdu_seq = 0;
894 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
895 __func__, ch->pdu_seq);
896
897 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
898 /* Put the write channel in idle state */
899 ch = priv->channel[CTCM_WRITE];
900 if (ch->collect_len > 0) {
901 spin_lock(&ch->collect_lock);
902 ctcm_purge_skb_queue(&ch->collect_queue);
903 ch->collect_len = 0;
904 spin_unlock(&ch->collect_lock);
905 }
906 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
907 ctcm_clear_busy(dev);
908
909 if (grp->estconnfunc) {
910 grp->estconnfunc(grp->port_num, 0,
911 grp->group_max_buflen);
912 grp->estconnfunc = NULL;
913 } else if (grp->allochanfunc)
914 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
915
916 grp->send_qllc_disc = 1;
917 grp->changed_side = 0;
918
919 return;
920
921 }
922
923 /*
924 * Increment the MPC Group Active Channel Counts
925 * helper of dev_action (called from channel fsm)
926 */
mpc_channel_action(struct channel * ch,int direction,int action)927 void mpc_channel_action(struct channel *ch, int direction, int action)
928 {
929 struct net_device *dev = ch->netdev;
930 struct ctcm_priv *priv = dev->ml_priv;
931 struct mpc_group *grp = priv->mpcg;
932
933 if (grp == NULL) {
934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
935 "%s(%s): No MPC group",
936 CTCM_FUNTAIL, dev->name);
937 return;
938 }
939
940 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
941
942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
943 "%s: %i / Grp:%s total_channels=%i, active_channels: "
944 "read=%i, write=%i\n", __func__, action,
945 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
946 grp->active_channels[CTCM_READ],
947 grp->active_channels[CTCM_WRITE]);
948
949 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
950 grp->num_channel_paths++;
951 grp->active_channels[direction]++;
952 grp->outstanding_xid2++;
953 ch->in_mpcgroup = 1;
954
955 if (ch->xid_skb != NULL)
956 dev_kfree_skb_any(ch->xid_skb);
957
958 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
959 GFP_ATOMIC | GFP_DMA);
960 if (ch->xid_skb == NULL) {
961 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
962 "%s(%s): Couldn't alloc ch xid_skb\n",
963 CTCM_FUNTAIL, dev->name);
964 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
965 return;
966 }
967 ch->xid_skb_data = ch->xid_skb->data;
968 ch->xid_th = (struct th_header *)ch->xid_skb->data;
969 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
970 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
971 skb_put(ch->xid_skb, XID2_LENGTH);
972 ch->xid_id = skb_tail_pointer(ch->xid_skb);
973 ch->xid_skb->data = ch->xid_skb_data;
974 skb_reset_tail_pointer(ch->xid_skb);
975 ch->xid_skb->len = 0;
976
977 skb_put_data(ch->xid_skb, grp->xid_skb->data,
978 grp->xid_skb->len);
979
980 ch->xid->xid2_dlc_type =
981 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
982 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
983
984 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
985 ch->xid->xid2_buf_len = 0x00;
986
987 ch->xid_skb->data = ch->xid_skb_data;
988 skb_reset_tail_pointer(ch->xid_skb);
989 ch->xid_skb->len = 0;
990
991 fsm_newstate(ch->fsm, CH_XID0_PENDING);
992
993 if ((grp->active_channels[CTCM_READ] > 0) &&
994 (grp->active_channels[CTCM_WRITE] > 0) &&
995 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
996 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
997 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
998 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
999 __func__, dev->name);
1000 }
1001 } else if ((action == MPC_CHANNEL_REMOVE) &&
1002 (ch->in_mpcgroup == 1)) {
1003 ch->in_mpcgroup = 0;
1004 grp->num_channel_paths--;
1005 grp->active_channels[direction]--;
1006
1007 if (ch->xid_skb != NULL)
1008 dev_kfree_skb_any(ch->xid_skb);
1009 ch->xid_skb = NULL;
1010
1011 if (grp->channels_terminating)
1012 goto done;
1013
1014 if (((grp->active_channels[CTCM_READ] == 0) &&
1015 (grp->active_channels[CTCM_WRITE] > 0))
1016 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1017 (grp->active_channels[CTCM_READ] > 0)))
1018 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1019 }
1020 done:
1021 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1022 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1023 "read=%i, write=%i\n", __func__, action,
1024 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1025 grp->active_channels[CTCM_READ],
1026 grp->active_channels[CTCM_WRITE]);
1027
1028 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1029 }
1030
1031 /**
1032 * Unpack a just received skb and hand it over to
1033 * upper layers.
1034 * special MPC version of unpack_skb.
1035 *
1036 * ch The channel where this skb has been received.
1037 * pskb The received skb.
1038 */
ctcmpc_unpack_skb(struct channel * ch,struct sk_buff * pskb)1039 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1040 {
1041 struct net_device *dev = ch->netdev;
1042 struct ctcm_priv *priv = dev->ml_priv;
1043 struct mpc_group *grp = priv->mpcg;
1044 struct pdu *curr_pdu;
1045 struct mpcg_info *mpcginfo;
1046 struct th_header *header = NULL;
1047 struct th_sweep *sweep = NULL;
1048 int pdu_last_seen = 0;
1049 __u32 new_len;
1050 struct sk_buff *skb;
1051 int skblen;
1052 int sendrc = 0;
1053
1054 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1055 __func__, dev->name, smp_processor_id(), ch->id);
1056
1057 header = (struct th_header *)pskb->data;
1058 if ((header->th_seg == 0) &&
1059 (header->th_ch_flag == 0) &&
1060 (header->th_blk_flag == 0) &&
1061 (header->th_seq_num == 0))
1062 /* nothing for us */ goto done;
1063
1064 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1065 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1066 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1067
1068 pskb->dev = dev;
1069 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1070 skb_pull(pskb, TH_HEADER_LENGTH);
1071
1072 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1073 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1074 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1075 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1076 (header->th_seq_num != ch->th_seq_num + 1) &&
1077 (ch->th_seq_num != 0))) {
1078 /* This is NOT the next segment *
1079 * we are not the correct race winner *
1080 * go away and let someone else win *
1081 * BUT..this only applies if xid negot *
1082 * is done *
1083 */
1084 grp->out_of_sequence += 1;
1085 __skb_push(pskb, TH_HEADER_LENGTH);
1086 skb_queue_tail(&ch->io_queue, pskb);
1087 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1088 "got:%08x\n", __func__,
1089 ch->th_seq_num + 1, header->th_seq_num);
1090
1091 return;
1092 }
1093 grp->out_of_sequence = 0;
1094 ch->th_seq_num = header->th_seq_num;
1095
1096 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1097 __func__, ch->th_seq_num);
1098
1099 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1100 goto done;
1101 while ((pskb->len > 0) && !pdu_last_seen) {
1102 curr_pdu = (struct pdu *)pskb->data;
1103
1104 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1105 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1106 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1107 __func__, pskb->len);
1108
1109 skb_pull(pskb, PDU_HEADER_LENGTH);
1110
1111 if (curr_pdu->pdu_flag & PDU_LAST)
1112 pdu_last_seen = 1;
1113 if (curr_pdu->pdu_flag & PDU_CNTL)
1114 pskb->protocol = htons(ETH_P_SNAP);
1115 else
1116 pskb->protocol = htons(ETH_P_SNA_DIX);
1117
1118 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1120 "%s(%s): Dropping packet with "
1121 "illegal siize %d",
1122 CTCM_FUNTAIL, dev->name, pskb->len);
1123
1124 priv->stats.rx_dropped++;
1125 priv->stats.rx_length_errors++;
1126 goto done;
1127 }
1128 skb_reset_mac_header(pskb);
1129 new_len = curr_pdu->pdu_offset;
1130 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1131 __func__, new_len);
1132 if ((new_len == 0) || (new_len > pskb->len)) {
1133 /* should never happen */
1134 /* pskb len must be hosed...bail out */
1135 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1136 "%s(%s): non valid pdu_offset: %04x",
1137 /* "data may be lost", */
1138 CTCM_FUNTAIL, dev->name, new_len);
1139 goto done;
1140 }
1141 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1142
1143 if (!skb) {
1144 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1145 "%s(%s): MEMORY allocation error",
1146 CTCM_FUNTAIL, dev->name);
1147 priv->stats.rx_dropped++;
1148 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1149 goto done;
1150 }
1151 skb_put_data(skb, pskb->data, new_len);
1152
1153 skb_reset_mac_header(skb);
1154 skb->dev = pskb->dev;
1155 skb->protocol = pskb->protocol;
1156 skb->ip_summed = CHECKSUM_UNNECESSARY;
1157 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1158 ch->pdu_seq++;
1159
1160 if (do_debug_data) {
1161 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1162 __func__, ch->pdu_seq);
1163 ctcm_pr_debug("%s: skb:%0lx "
1164 "skb len: %d \n", __func__,
1165 (unsigned long)skb, skb->len);
1166 ctcm_pr_debug("%s: up to 32 bytes "
1167 "of pdu_data sent\n", __func__);
1168 ctcmpc_dump32((char *)skb->data, skb->len);
1169 }
1170
1171 skblen = skb->len;
1172 sendrc = netif_rx(skb);
1173 priv->stats.rx_packets++;
1174 priv->stats.rx_bytes += skblen;
1175 skb_pull(pskb, new_len); /* point to next PDU */
1176 }
1177 } else {
1178 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1179 if (mpcginfo == NULL)
1180 goto done;
1181
1182 mpcginfo->ch = ch;
1183 mpcginfo->th = header;
1184 mpcginfo->skb = pskb;
1185 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1186 __func__);
1187 /* it's a sweep? */
1188 sweep = (struct th_sweep *)pskb->data;
1189 mpcginfo->sweep = sweep;
1190 if (header->th_ch_flag == TH_SWEEP_REQ)
1191 mpc_rcvd_sweep_req(mpcginfo);
1192 else if (header->th_ch_flag == TH_SWEEP_RESP)
1193 mpc_rcvd_sweep_resp(mpcginfo);
1194 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1195 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1196 skb_pull(pskb, XID2_LENGTH);
1197 mpcginfo->xid = thisxid;
1198 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1199 } else if (header->th_blk_flag == TH_DISCONTACT)
1200 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1201 else if (header->th_seq_num != 0) {
1202 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1203 "%s(%s): control pkt expected\n",
1204 CTCM_FUNTAIL, dev->name);
1205 priv->stats.rx_dropped++;
1206 /* mpcginfo only used for non-data transfers */
1207 if (do_debug_data)
1208 ctcmpc_dump_skb(pskb, -8);
1209 }
1210 kfree(mpcginfo);
1211 }
1212 done:
1213
1214 dev_kfree_skb_any(pskb);
1215 if (sendrc == NET_RX_DROP) {
1216 dev_warn(&dev->dev,
1217 "The network backlog for %s is exceeded, "
1218 "package dropped\n", __func__);
1219 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1220 }
1221
1222 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1223 __func__, dev->name, ch, ch->id);
1224 }
1225
1226 /**
1227 * tasklet helper for mpc's skb unpacking.
1228 *
1229 * ch The channel to work on.
1230 * Allow flow control back pressure to occur here.
1231 * Throttling back channel can result in excessive
1232 * channel inactivity and system deact of channel
1233 */
ctcmpc_bh(unsigned long thischan)1234 void ctcmpc_bh(unsigned long thischan)
1235 {
1236 struct channel *ch = (struct channel *)thischan;
1237 struct sk_buff *skb;
1238 struct net_device *dev = ch->netdev;
1239 struct ctcm_priv *priv = dev->ml_priv;
1240 struct mpc_group *grp = priv->mpcg;
1241
1242 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1243 dev->name, smp_processor_id(), __func__, ch->id);
1244 /* caller has requested driver to throttle back */
1245 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1246 (skb = skb_dequeue(&ch->io_queue))) {
1247 ctcmpc_unpack_skb(ch, skb);
1248 if (grp->out_of_sequence > 20) {
1249 /* assume data loss has occurred if */
1250 /* missing seq_num for extended */
1251 /* period of time */
1252 grp->out_of_sequence = 0;
1253 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1254 break;
1255 }
1256 if (skb == skb_peek(&ch->io_queue))
1257 break;
1258 }
1259 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1260 __func__, dev->name, ch, ch->id);
1261 return;
1262 }
1263
1264 /*
1265 * MPC Group Initializations
1266 */
ctcmpc_init_mpc_group(struct ctcm_priv * priv)1267 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1268 {
1269 struct mpc_group *grp;
1270
1271 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1272 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1273
1274 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1275 if (grp == NULL)
1276 return NULL;
1277
1278 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1279 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1280 mpcg_fsm_len, GFP_KERNEL);
1281 if (grp->fsm == NULL) {
1282 kfree(grp);
1283 return NULL;
1284 }
1285
1286 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1287 fsm_settimer(grp->fsm, &grp->timer);
1288
1289 grp->xid_skb =
1290 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1291 if (grp->xid_skb == NULL) {
1292 kfree_fsm(grp->fsm);
1293 kfree(grp);
1294 return NULL;
1295 }
1296 /* base xid for all channels in group */
1297 grp->xid_skb_data = grp->xid_skb->data;
1298 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1299 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1300
1301 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1302 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1303 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1304 grp->xid->xid2_sender_id = jiffies;
1305
1306 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1307 skb_put_data(grp->xid_skb, "VTAM", 4);
1308
1309 grp->rcvd_xid_skb =
1310 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1311 if (grp->rcvd_xid_skb == NULL) {
1312 kfree_fsm(grp->fsm);
1313 dev_kfree_skb(grp->xid_skb);
1314 kfree(grp);
1315 return NULL;
1316 }
1317 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1318 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1319 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1320 grp->saved_xid2 = NULL;
1321 priv->xid = grp->xid;
1322 priv->mpcg = grp;
1323 return grp;
1324 }
1325
1326 /*
1327 * The MPC Group Station FSM
1328 */
1329
1330 /*
1331 * MPC Group Station FSM actions
1332 * CTCM_PROTO_MPC only
1333 */
1334
1335 /**
1336 * NOP action for statemachines
1337 */
mpc_action_nop(fsm_instance * fi,int event,void * arg)1338 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1339 {
1340 }
1341
1342 /*
1343 * invoked when the device transitions to dev_stopped
1344 * MPC will stop each individual channel if a single XID failure
1345 * occurs, or will intitiate all channels be stopped if a GROUP
1346 * level failure occurs.
1347 */
mpc_action_go_inop(fsm_instance * fi,int event,void * arg)1348 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1349 {
1350 struct net_device *dev = arg;
1351 struct ctcm_priv *priv;
1352 struct mpc_group *grp;
1353 struct channel *wch;
1354
1355 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1356
1357 priv = dev->ml_priv;
1358 grp = priv->mpcg;
1359 grp->flow_off_called = 0;
1360 fsm_deltimer(&grp->timer);
1361 if (grp->channels_terminating)
1362 return;
1363
1364 grp->channels_terminating = 1;
1365 grp->saved_state = fsm_getstate(grp->fsm);
1366 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1367 if (grp->saved_state > MPCG_STATE_XID7INITF)
1368 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1369 "%s(%s): MPC GROUP INOPERATIVE",
1370 CTCM_FUNTAIL, dev->name);
1371 if ((grp->saved_state != MPCG_STATE_RESET) ||
1372 /* dealloc_channel has been called */
1373 (grp->port_persist == 0))
1374 fsm_deltimer(&priv->restart_timer);
1375
1376 wch = priv->channel[CTCM_WRITE];
1377
1378 switch (grp->saved_state) {
1379 case MPCG_STATE_RESET:
1380 case MPCG_STATE_INOP:
1381 case MPCG_STATE_XID2INITW:
1382 case MPCG_STATE_XID0IOWAIT:
1383 case MPCG_STATE_XID2INITX:
1384 case MPCG_STATE_XID7INITW:
1385 case MPCG_STATE_XID7INITX:
1386 case MPCG_STATE_XID0IOWAIX:
1387 case MPCG_STATE_XID7INITI:
1388 case MPCG_STATE_XID7INITZ:
1389 case MPCG_STATE_XID7INITF:
1390 break;
1391 case MPCG_STATE_FLOWC:
1392 case MPCG_STATE_READY:
1393 default:
1394 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1395 }
1396
1397 grp->xid2_tgnum = 0;
1398 grp->group_max_buflen = 0; /*min of all received */
1399 grp->outstanding_xid2 = 0;
1400 grp->outstanding_xid7 = 0;
1401 grp->outstanding_xid7_p2 = 0;
1402 grp->saved_xid2 = NULL;
1403 grp->xidnogood = 0;
1404 grp->changed_side = 0;
1405
1406 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1407 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1408 grp->rcvd_xid_skb->len = 0;
1409 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1410 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1411
1412 if (grp->send_qllc_disc == 1) {
1413 grp->send_qllc_disc = 0;
1414 mpc_send_qllc_discontact(dev);
1415 }
1416
1417 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1418 /* This can result in INOP of VTAM PU due to halting of */
1419 /* outstanding IO which causes a sense to be returned */
1420 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1421 /* become unreachable without manual intervention */
1422 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1423 grp->alloc_called = 0;
1424 fsm_deltimer(&priv->restart_timer);
1425 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1426 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1427 if (grp->saved_state > MPCG_STATE_XID7INITF)
1428 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1429 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1430 CTCM_FUNTAIL, dev->name);
1431 } else {
1432 fsm_deltimer(&priv->restart_timer);
1433 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1434 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1435 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1436 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1437 CTCM_FUNTAIL, dev->name);
1438 }
1439 }
1440
1441 /**
1442 * Handle mpc group action timeout.
1443 * MPC Group Station FSM action
1444 * CTCM_PROTO_MPC only
1445 *
1446 * fi An instance of an mpc_group fsm.
1447 * event The event, just happened.
1448 * arg Generic pointer, casted from net_device * upon call.
1449 */
mpc_action_timeout(fsm_instance * fi,int event,void * arg)1450 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1451 {
1452 struct net_device *dev = arg;
1453 struct ctcm_priv *priv;
1454 struct mpc_group *grp;
1455 struct channel *wch;
1456 struct channel *rch;
1457
1458 priv = dev->ml_priv;
1459 grp = priv->mpcg;
1460 wch = priv->channel[CTCM_WRITE];
1461 rch = priv->channel[CTCM_READ];
1462
1463 switch (fsm_getstate(grp->fsm)) {
1464 case MPCG_STATE_XID2INITW:
1465 /* Unless there is outstanding IO on the */
1466 /* channel just return and wait for ATTN */
1467 /* interrupt to begin XID negotiations */
1468 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1469 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1470 break;
1471 fallthrough;
1472 default:
1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1474 }
1475
1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1477 "%s: dev=%s exit",
1478 CTCM_FUNTAIL, dev->name);
1479 return;
1480 }
1481
1482 /*
1483 * MPC Group Station FSM action
1484 * CTCM_PROTO_MPC only
1485 */
mpc_action_discontact(fsm_instance * fi,int event,void * arg)1486 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1487 {
1488 struct mpcg_info *mpcginfo = arg;
1489 struct channel *ch = mpcginfo->ch;
1490 struct net_device *dev;
1491 struct ctcm_priv *priv;
1492 struct mpc_group *grp;
1493
1494 if (ch) {
1495 dev = ch->netdev;
1496 if (dev) {
1497 priv = dev->ml_priv;
1498 if (priv) {
1499 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1500 "%s: %s: %s\n",
1501 CTCM_FUNTAIL, dev->name, ch->id);
1502 grp = priv->mpcg;
1503 grp->send_qllc_disc = 1;
1504 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1505 }
1506 }
1507 }
1508
1509 return;
1510 }
1511
1512 /*
1513 * MPC Group Station - not part of FSM
1514 * CTCM_PROTO_MPC only
1515 * called from add_channel in ctcm_main.c
1516 */
mpc_action_send_discontact(unsigned long thischan)1517 void mpc_action_send_discontact(unsigned long thischan)
1518 {
1519 int rc;
1520 struct channel *ch = (struct channel *)thischan;
1521 unsigned long saveflags = 0;
1522
1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1525 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1526
1527 if (rc != 0) {
1528 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1529 }
1530
1531 return;
1532 }
1533
1534
1535 /*
1536 * helper function of mpc FSM
1537 * CTCM_PROTO_MPC only
1538 * mpc_action_rcvd_xid7
1539 */
mpc_validate_xid(struct mpcg_info * mpcginfo)1540 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1541 {
1542 struct channel *ch = mpcginfo->ch;
1543 struct net_device *dev = ch->netdev;
1544 struct ctcm_priv *priv = dev->ml_priv;
1545 struct mpc_group *grp = priv->mpcg;
1546 struct xid2 *xid = mpcginfo->xid;
1547 int rc = 0;
1548 __u64 our_id = 0;
1549 __u64 their_id = 0;
1550 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1551
1552 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1553
1554 if (xid == NULL) {
1555 rc = 1;
1556 /* XID REJECTED: xid == NULL */
1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1558 "%s(%s): xid = NULL",
1559 CTCM_FUNTAIL, ch->id);
1560 goto done;
1561 }
1562
1563 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1564
1565 /*the received direction should be the opposite of ours */
1566 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1567 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1568 rc = 2;
1569 /* XID REJECTED: r/w channel pairing mismatch */
1570 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1571 "%s(%s): r/w channel pairing mismatch",
1572 CTCM_FUNTAIL, ch->id);
1573 goto done;
1574 }
1575
1576 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1577 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1578 grp->group_max_buflen, xid->xid2_buf_len);
1579
1580 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1581 xid->xid2_buf_len - len)
1582 grp->group_max_buflen = xid->xid2_buf_len - len;
1583 }
1584
1585 if (grp->saved_xid2 == NULL) {
1586 grp->saved_xid2 =
1587 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1588
1589 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1590 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1591
1592 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1593 grp->rcvd_xid_skb->len = 0;
1594
1595 /* convert two 32 bit numbers into 1 64 bit for id compare */
1596 our_id = (__u64)priv->xid->xid2_adj_id;
1597 our_id = our_id << 32;
1598 our_id = our_id + priv->xid->xid2_sender_id;
1599 their_id = (__u64)xid->xid2_adj_id;
1600 their_id = their_id << 32;
1601 their_id = their_id + xid->xid2_sender_id;
1602 /* lower id assume the xside role */
1603 if (our_id < their_id) {
1604 grp->roll = XSIDE;
1605 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1606 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1607 CTCM_FUNTAIL, ch->id);
1608 } else {
1609 grp->roll = YSIDE;
1610 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1611 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1612 CTCM_FUNTAIL, ch->id);
1613 }
1614
1615 } else {
1616 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1617 rc = 3;
1618 /* XID REJECTED: xid flag byte4 mismatch */
1619 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620 "%s(%s): xid flag byte4 mismatch",
1621 CTCM_FUNTAIL, ch->id);
1622 }
1623 if (xid->xid2_flag2 == 0x40) {
1624 rc = 4;
1625 /* XID REJECTED - xid NOGOOD */
1626 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627 "%s(%s): xid NOGOOD",
1628 CTCM_FUNTAIL, ch->id);
1629 }
1630 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1631 rc = 5;
1632 /* XID REJECTED - Adjacent Station ID Mismatch */
1633 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1634 "%s(%s): Adjacent Station ID Mismatch",
1635 CTCM_FUNTAIL, ch->id);
1636 }
1637 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1638 rc = 6;
1639 /* XID REJECTED - Sender Address Mismatch */
1640 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1641 "%s(%s): Sender Address Mismatch",
1642 CTCM_FUNTAIL, ch->id);
1643 }
1644 }
1645 done:
1646 if (rc) {
1647 dev_warn(&dev->dev,
1648 "The XID used in the MPC protocol is not valid, "
1649 "rc = %d\n", rc);
1650 priv->xid->xid2_flag2 = 0x40;
1651 grp->saved_xid2->xid2_flag2 = 0x40;
1652 }
1653
1654 return rc;
1655 }
1656
1657 /*
1658 * MPC Group Station FSM action
1659 * CTCM_PROTO_MPC only
1660 */
mpc_action_side_xid(fsm_instance * fsm,void * arg,int side)1661 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1662 {
1663 struct channel *ch = arg;
1664 int rc = 0;
1665 int gotlock = 0;
1666 unsigned long saveflags = 0; /* avoids compiler warning with
1667 spin_unlock_irqrestore */
1668
1669 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1670 __func__, smp_processor_id(), ch, ch->id);
1671
1672 if (ctcm_checkalloc_buffer(ch))
1673 goto done;
1674
1675 /*
1676 * skb data-buffer referencing:
1677 */
1678 ch->trans_skb->data = ch->trans_skb_data;
1679 skb_reset_tail_pointer(ch->trans_skb);
1680 ch->trans_skb->len = 0;
1681 /* result of the previous 3 statements is NOT always
1682 * already set after ctcm_checkalloc_buffer
1683 * because of possible reuse of the trans_skb
1684 */
1685 memset(ch->trans_skb->data, 0, 16);
1686 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1687 /* check is main purpose here: */
1688 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1689 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1690 /* check is main purpose here: */
1691 skb_put(ch->trans_skb, XID2_LENGTH);
1692 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1693 /* cleanup back to startpoint */
1694 ch->trans_skb->data = ch->trans_skb_data;
1695 skb_reset_tail_pointer(ch->trans_skb);
1696 ch->trans_skb->len = 0;
1697
1698 /* non-checking rewrite of above skb data-buffer referencing: */
1699 /*
1700 memset(ch->trans_skb->data, 0, 16);
1701 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1702 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1703 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1704 */
1705
1706 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1707 ch->ccw[8].count = 0;
1708 ch->ccw[8].cda = 0x00;
1709
1710 if (!(ch->xid_th && ch->xid && ch->xid_id))
1711 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1712 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1713 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1714
1715 if (side == XSIDE) {
1716 /* mpc_action_xside_xid */
1717 if (ch->xid_th == NULL)
1718 goto done;
1719 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1720 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1721 ch->ccw[9].count = TH_HEADER_LENGTH;
1722 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1723
1724 if (ch->xid == NULL)
1725 goto done;
1726 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1727 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1728 ch->ccw[10].count = XID2_LENGTH;
1729 ch->ccw[10].cda = virt_to_phys(ch->xid);
1730
1731 ch->ccw[11].cmd_code = CCW_CMD_READ;
1732 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1733 ch->ccw[11].count = TH_HEADER_LENGTH;
1734 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1735
1736 ch->ccw[12].cmd_code = CCW_CMD_READ;
1737 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1738 ch->ccw[12].count = XID2_LENGTH;
1739 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1740
1741 ch->ccw[13].cmd_code = CCW_CMD_READ;
1742 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1743
1744 } else { /* side == YSIDE : mpc_action_yside_xid */
1745 ch->ccw[9].cmd_code = CCW_CMD_READ;
1746 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1747 ch->ccw[9].count = TH_HEADER_LENGTH;
1748 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1749
1750 ch->ccw[10].cmd_code = CCW_CMD_READ;
1751 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1752 ch->ccw[10].count = XID2_LENGTH;
1753 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1754
1755 if (ch->xid_th == NULL)
1756 goto done;
1757 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1758 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1759 ch->ccw[11].count = TH_HEADER_LENGTH;
1760 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1761
1762 if (ch->xid == NULL)
1763 goto done;
1764 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1765 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1766 ch->ccw[12].count = XID2_LENGTH;
1767 ch->ccw[12].cda = virt_to_phys(ch->xid);
1768
1769 if (ch->xid_id == NULL)
1770 goto done;
1771 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1772 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1773
1774 }
1775 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1776 ch->ccw[13].count = 4;
1777
1778 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1779 ch->ccw[14].flags = CCW_FLAG_SLI;
1780 ch->ccw[14].count = 0;
1781 ch->ccw[14].cda = 0;
1782
1783 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1784 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1785 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1786 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1787
1788 if (!in_irq()) {
1789 /* Such conditional locking is a known problem for
1790 * sparse because its static undeterministic.
1791 * Warnings should be ignored here. */
1792 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1793 gotlock = 1;
1794 }
1795
1796 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1797 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1798
1799 if (gotlock) /* see remark above about conditional locking */
1800 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1801
1802 if (rc != 0) {
1803 ctcm_ccw_check_rc(ch, rc,
1804 (side == XSIDE) ? "x-side XID" : "y-side XID");
1805 }
1806
1807 done:
1808 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1809 __func__, ch, ch->id);
1810 return;
1811
1812 }
1813
1814 /*
1815 * MPC Group Station FSM action
1816 * CTCM_PROTO_MPC only
1817 */
mpc_action_xside_xid(fsm_instance * fsm,int event,void * arg)1818 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1819 {
1820 mpc_action_side_xid(fsm, arg, XSIDE);
1821 }
1822
1823 /*
1824 * MPC Group Station FSM action
1825 * CTCM_PROTO_MPC only
1826 */
mpc_action_yside_xid(fsm_instance * fsm,int event,void * arg)1827 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1828 {
1829 mpc_action_side_xid(fsm, arg, YSIDE);
1830 }
1831
1832 /*
1833 * MPC Group Station FSM action
1834 * CTCM_PROTO_MPC only
1835 */
mpc_action_doxid0(fsm_instance * fsm,int event,void * arg)1836 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1837 {
1838 struct channel *ch = arg;
1839 struct net_device *dev = ch->netdev;
1840 struct ctcm_priv *priv = dev->ml_priv;
1841 struct mpc_group *grp = priv->mpcg;
1842
1843 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1844 __func__, smp_processor_id(), ch, ch->id);
1845
1846 if (ch->xid == NULL) {
1847 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1848 "%s(%s): ch->xid == NULL",
1849 CTCM_FUNTAIL, dev->name);
1850 return;
1851 }
1852
1853 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1854
1855 ch->xid->xid2_option = XID2_0;
1856
1857 switch (fsm_getstate(grp->fsm)) {
1858 case MPCG_STATE_XID2INITW:
1859 case MPCG_STATE_XID2INITX:
1860 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1861 break;
1862 case MPCG_STATE_XID0IOWAIT:
1863 case MPCG_STATE_XID0IOWAIX:
1864 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1865 break;
1866 }
1867
1868 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1869
1870 return;
1871 }
1872
1873 /*
1874 * MPC Group Station FSM action
1875 * CTCM_PROTO_MPC only
1876 */
mpc_action_doxid7(fsm_instance * fsm,int event,void * arg)1877 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1878 {
1879 struct net_device *dev = arg;
1880 struct ctcm_priv *priv = dev->ml_priv;
1881 struct mpc_group *grp = NULL;
1882 int direction;
1883 int send = 0;
1884
1885 if (priv)
1886 grp = priv->mpcg;
1887 if (grp == NULL)
1888 return;
1889
1890 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1891 struct channel *ch = priv->channel[direction];
1892 struct xid2 *thisxid = ch->xid;
1893 ch->xid_skb->data = ch->xid_skb_data;
1894 skb_reset_tail_pointer(ch->xid_skb);
1895 ch->xid_skb->len = 0;
1896 thisxid->xid2_option = XID2_7;
1897 send = 0;
1898
1899 /* xid7 phase 1 */
1900 if (grp->outstanding_xid7_p2 > 0) {
1901 if (grp->roll == YSIDE) {
1902 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1903 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1904 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1905 skb_put_data(ch->xid_skb, &thdummy,
1906 TH_HEADER_LENGTH);
1907 send = 1;
1908 }
1909 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1910 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1911 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1912 skb_put_data(ch->xid_skb, &thnorm,
1913 TH_HEADER_LENGTH);
1914 send = 1;
1915 }
1916 } else {
1917 /* xid7 phase 2 */
1918 if (grp->roll == YSIDE) {
1919 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1920 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1921 skb_put_data(ch->xid_skb, &thnorm,
1922 TH_HEADER_LENGTH);
1923 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1924 send = 1;
1925 }
1926 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1927 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1928 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1929 skb_put_data(ch->xid_skb, &thdummy,
1930 TH_HEADER_LENGTH);
1931 send = 1;
1932 }
1933 }
1934
1935 if (send)
1936 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1937 }
1938
1939 return;
1940 }
1941
1942 /*
1943 * MPC Group Station FSM action
1944 * CTCM_PROTO_MPC only
1945 */
mpc_action_rcvd_xid0(fsm_instance * fsm,int event,void * arg)1946 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1947 {
1948
1949 struct mpcg_info *mpcginfo = arg;
1950 struct channel *ch = mpcginfo->ch;
1951 struct net_device *dev = ch->netdev;
1952 struct ctcm_priv *priv = dev->ml_priv;
1953 struct mpc_group *grp = priv->mpcg;
1954
1955 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1956 __func__, ch->id, grp->outstanding_xid2,
1957 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1958
1959 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1960 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1961
1962 grp->outstanding_xid2--;
1963 grp->outstanding_xid7++;
1964 grp->outstanding_xid7_p2++;
1965
1966 /* must change state before validating xid to */
1967 /* properly handle interim interrupts received*/
1968 switch (fsm_getstate(grp->fsm)) {
1969 case MPCG_STATE_XID2INITW:
1970 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1971 mpc_validate_xid(mpcginfo);
1972 break;
1973 case MPCG_STATE_XID0IOWAIT:
1974 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1975 mpc_validate_xid(mpcginfo);
1976 break;
1977 case MPCG_STATE_XID2INITX:
1978 if (grp->outstanding_xid2 == 0) {
1979 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1980 mpc_validate_xid(mpcginfo);
1981 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1982 }
1983 break;
1984 case MPCG_STATE_XID0IOWAIX:
1985 if (grp->outstanding_xid2 == 0) {
1986 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1987 mpc_validate_xid(mpcginfo);
1988 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1989 }
1990 break;
1991 }
1992
1993 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1994 __func__, ch->id, grp->outstanding_xid2,
1995 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1996 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1997 __func__, ch->id,
1998 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1999 return;
2000
2001 }
2002
2003
2004 /*
2005 * MPC Group Station FSM action
2006 * CTCM_PROTO_MPC only
2007 */
mpc_action_rcvd_xid7(fsm_instance * fsm,int event,void * arg)2008 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2009 {
2010 struct mpcg_info *mpcginfo = arg;
2011 struct channel *ch = mpcginfo->ch;
2012 struct net_device *dev = ch->netdev;
2013 struct ctcm_priv *priv = dev->ml_priv;
2014 struct mpc_group *grp = priv->mpcg;
2015
2016 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2017 __func__, smp_processor_id(), ch, ch->id);
2018 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2019 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2020
2021 grp->outstanding_xid7--;
2022 ch->xid_skb->data = ch->xid_skb_data;
2023 skb_reset_tail_pointer(ch->xid_skb);
2024 ch->xid_skb->len = 0;
2025
2026 switch (fsm_getstate(grp->fsm)) {
2027 case MPCG_STATE_XID7INITI:
2028 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2029 mpc_validate_xid(mpcginfo);
2030 break;
2031 case MPCG_STATE_XID7INITW:
2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2033 mpc_validate_xid(mpcginfo);
2034 break;
2035 case MPCG_STATE_XID7INITZ:
2036 case MPCG_STATE_XID7INITX:
2037 if (grp->outstanding_xid7 == 0) {
2038 if (grp->outstanding_xid7_p2 > 0) {
2039 grp->outstanding_xid7 =
2040 grp->outstanding_xid7_p2;
2041 grp->outstanding_xid7_p2 = 0;
2042 } else
2043 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2044
2045 mpc_validate_xid(mpcginfo);
2046 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2047 break;
2048 }
2049 mpc_validate_xid(mpcginfo);
2050 break;
2051 }
2052 return;
2053 }
2054
2055 /*
2056 * mpc_action helper of an MPC Group Station FSM action
2057 * CTCM_PROTO_MPC only
2058 */
mpc_send_qllc_discontact(struct net_device * dev)2059 static int mpc_send_qllc_discontact(struct net_device *dev)
2060 {
2061 __u32 new_len = 0;
2062 struct sk_buff *skb;
2063 struct qllc *qllcptr;
2064 struct ctcm_priv *priv = dev->ml_priv;
2065 struct mpc_group *grp = priv->mpcg;
2066
2067 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2068 __func__, mpcg_state_names[grp->saved_state]);
2069
2070 switch (grp->saved_state) {
2071 /*
2072 * establish conn callback function is
2073 * preferred method to report failure
2074 */
2075 case MPCG_STATE_XID0IOWAIT:
2076 case MPCG_STATE_XID0IOWAIX:
2077 case MPCG_STATE_XID7INITI:
2078 case MPCG_STATE_XID7INITZ:
2079 case MPCG_STATE_XID2INITW:
2080 case MPCG_STATE_XID2INITX:
2081 case MPCG_STATE_XID7INITW:
2082 case MPCG_STATE_XID7INITX:
2083 if (grp->estconnfunc) {
2084 grp->estconnfunc(grp->port_num, -1, 0);
2085 grp->estconnfunc = NULL;
2086 break;
2087 }
2088 fallthrough;
2089 case MPCG_STATE_FLOWC:
2090 case MPCG_STATE_READY:
2091 grp->send_qllc_disc = 2;
2092 new_len = sizeof(struct qllc);
2093 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2094 if (qllcptr == NULL) {
2095 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2096 "%s(%s): qllcptr allocation error",
2097 CTCM_FUNTAIL, dev->name);
2098 return -ENOMEM;
2099 }
2100
2101 qllcptr->qllc_address = 0xcc;
2102 qllcptr->qllc_commands = 0x03;
2103
2104 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2105
2106 if (skb == NULL) {
2107 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2108 "%s(%s): skb allocation error",
2109 CTCM_FUNTAIL, dev->name);
2110 priv->stats.rx_dropped++;
2111 kfree(qllcptr);
2112 return -ENOMEM;
2113 }
2114
2115 skb_put_data(skb, qllcptr, new_len);
2116 kfree(qllcptr);
2117
2118 if (skb_headroom(skb) < 4) {
2119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2120 "%s(%s): skb_headroom error",
2121 CTCM_FUNTAIL, dev->name);
2122 dev_kfree_skb_any(skb);
2123 return -ENOMEM;
2124 }
2125
2126 *((__u32 *)skb_push(skb, 4)) =
2127 priv->channel[CTCM_READ]->pdu_seq;
2128 priv->channel[CTCM_READ]->pdu_seq++;
2129 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2130 __func__, priv->channel[CTCM_READ]->pdu_seq);
2131
2132 /* receipt of CC03 resets anticipated sequence number on
2133 receiving side */
2134 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2135 skb_reset_mac_header(skb);
2136 skb->dev = dev;
2137 skb->protocol = htons(ETH_P_SNAP);
2138 skb->ip_summed = CHECKSUM_UNNECESSARY;
2139
2140 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2141
2142 netif_rx(skb);
2143 break;
2144 default:
2145 break;
2146
2147 }
2148
2149 return 0;
2150 }
2151 /* --- This is the END my friend --- */
2152
2153