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Merge tag 'amlogic-dt-2' of https://git.kernel.org/pub/scm/linux/kernel/git/khilman...
[linux-2.6-block.git] / drivers / s390 / net / ctcm_mpc.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
293d984f 2/*
293d984f
PT		 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
2a7c6f2c
PT		 21#define KMSG_COMPONENT "ctcm"
22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
293d984f
PT		 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
293d984f 55#include "ctcm_main.h"
ce1f8938 56#include "ctcm_mpc.h"
293d984f
PT		 57#include "ctcm_fsms.h"
58
59static 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
82static 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
90static 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
107static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
108
109/*
110 * MPC Group state machine actions (static prototypes)
111 */
112static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
113static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
114static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
115static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
116static int mpc_validate_xid(struct mpcg_info *mpcginfo);
117static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
118static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
119static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
120static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
121static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
122static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
123
124#ifdef DEBUGDATA
125/*-------------------------------------------------------------------*
126* Dump buffer format *
127* *
128*--------------------------------------------------------------------*/
129void ctcmpc_dumpit(char *buf, int len)
130{
131 __u32 ct, sw, rm, dup;
132 char *ptr, *rptr;
133 char tbuf[82], tdup[82];
293d984f 134 char addr[22];
293d984f
PT		 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) {
ce1f8938 147 sprintf(addr, "%16.16llx", (__u64)rptr);
293d984f
PT		 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
ce1f8938 158 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
293d984f
PT		 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--;
aa3f2cb6
PT		 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",
293d984f 180 addr, boff, bhex, basc);
aa3f2cb6
PT		 181 dup = 0;
182 strcpy(duphex, bhex);
183 } else
184 dup++;
293d984f 185
aa3f2cb6
PT		 186 sw = 0;
187 rm = 16;
293d984f
PT		 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);
aa3f2cb6 201 ctcm_pr_debug(" --- %s ---\n", tdup);
293d984f 202 }
aa3f2cb6
PT		 203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
204 addr, boff, bhex, basc);
293d984f
PT		 205 } else {
206 if (dup >= 1) {
207 sprintf(tdup, "Duplicate as above to %s", addr);
aa3f2cb6 208 ctcm_pr_debug(" --- %s ---\n", tdup);
293d984f
PT		 209 }
210 if (dup != 0) {
aa3f2cb6 211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
293d984f
PT		 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 */
228void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
229{
aa3f2cb6 230 __u8 *p = skb->data;
293d984f
PT		 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
aa3f2cb6
PT		 242 ctcm_pr_debug("dump:\n");
243 ctcm_pr_debug("skb len=%d \n", skb->len);
293d984f
PT		 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;
aa3f2cb6
PT		 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);
293d984f
PT		 267 goto dumpdata;
268
269dumpth:
aa3f2cb6
PT		 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);
293d984f
PT		 276
277 }
278dumpdata:
279 if (bl > 32)
280 bl = 32;
aa3f2cb6 281 ctcm_pr_debug("data: ");
293d984f 282 for (i = 0; i < bl; i++)
aa3f2cb6
PT		 283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
284 ctcm_pr_debug("\n");
293d984f
PT		 285}
286#endif
287
aa3f2cb6
PT		 288static 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 }
261893d3 304 priv = dev->ml_priv;
aa3f2cb6
PT		 305 if (priv == NULL) {
306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
261893d3 307 "%s(%s): dev->ml_priv is NULL",
aa3f2cb6
PT		 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
293d984f
PT		 320/*
321 * ctc_mpc_alloc_channel
322 * (exported interface)
323 *
324 * Device Initialization :
325 * ACTPATH driven IO operations
326 */
327int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
328{
293d984f
PT		 329 struct net_device *dev;
330 struct mpc_group *grp;
331 struct ctcm_priv *priv;
332
aa3f2cb6
PT		 333 dev = ctcmpc_get_dev(port_num);
334 if (dev == NULL)
293d984f 335 return 1;
261893d3 336 priv = dev->ml_priv;
293d984f 337 grp = priv->mpcg;
293d984f
PT		 338
339 grp->allochanfunc = callback;
340 grp->port_num = port_num;
341 grp->port_persist = 1;
342
aa3f2cb6
PT		 343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
344 "%s(%s): state=%s",
345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
293d984f
PT		 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 case MPCG_STATE_XID0IOWAIT:
361 fsm_deltimer(&grp->timer);
362 grp->outstanding_xid2 = 0;
363 grp->outstanding_xid7 = 0;
364 grp->outstanding_xid7_p2 = 0;
365 grp->saved_xid2 = NULL;
366 if (callback)
367 ctcm_open(dev);
368 fsm_event(priv->fsm, DEV_EVENT_START, dev);
369 break;
370 case MPCG_STATE_READY:
371 /* XID exchanges completed after PORT was activated */
372 /* Link station already active */
373 /* Maybe timing issue...retry callback */
374 grp->allocchan_callback_retries++;
375 if (grp->allocchan_callback_retries < 4) {
376 if (grp->allochanfunc)
377 grp->allochanfunc(grp->port_num,
2a7c6f2c 378 grp->group_max_buflen);
293d984f
PT		 379 } else {
380 /* there are problems...bail out */
381 /* there may be a state mismatch so restart */
293d984f
PT		 382 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
383 grp->allocchan_callback_retries = 0;
384 }
385 break;
293d984f
PT		 386 }
387
293d984f
PT		 388 return 0;
389}
390EXPORT_SYMBOL(ctc_mpc_alloc_channel);
391
392/*
393 * ctc_mpc_establish_connectivity
394 * (exported interface)
395 */
396void ctc_mpc_establish_connectivity(int port_num,
397 void (*callback)(int, int, int))
398{
293d984f
PT		 399 struct net_device *dev;
400 struct mpc_group *grp;
401 struct ctcm_priv *priv;
402 struct channel *rch, *wch;
403
aa3f2cb6
PT		 404 dev = ctcmpc_get_dev(port_num);
405 if (dev == NULL)
293d984f 406 return;
261893d3 407 priv = dev->ml_priv;
aa3f2cb6 408 grp = priv->mpcg;
3c09e264
UB		 409 rch = priv->channel[CTCM_READ];
410 wch = priv->channel[CTCM_WRITE];
293d984f 411
aa3f2cb6
PT		 412 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
413 "%s(%s): state=%s",
414 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
293d984f
PT		 415
416 grp->estconnfunc = callback;
417 grp->port_num = port_num;
418
419 switch (fsm_getstate(grp->fsm)) {
420 case MPCG_STATE_READY:
421 /* XID exchanges completed after PORT was activated */
422 /* Link station already active */
423 /* Maybe timing issue...retry callback */
424 fsm_deltimer(&grp->timer);
425 grp->estconn_callback_retries++;
426 if (grp->estconn_callback_retries < 4) {
427 if (grp->estconnfunc) {
428 grp->estconnfunc(grp->port_num, 0,
429 grp->group_max_buflen);
430 grp->estconnfunc = NULL;
431 }
432 } else {
433 /* there are problems...bail out */
434 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
435 grp->estconn_callback_retries = 0;
436 }
437 break;
438 case MPCG_STATE_INOP:
439 case MPCG_STATE_RESET:
440 /* MPC Group is not ready to start XID - min num of */
441 /* 1 read and 1 write channel have not been acquired*/
aa3f2cb6
PT		 442
443 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
444 "%s(%s): REJECTED - inactive channels",
445 CTCM_FUNTAIL, dev->name);
293d984f
PT		 446 if (grp->estconnfunc) {
447 grp->estconnfunc(grp->port_num, -1, 0);
448 grp->estconnfunc = NULL;
449 }
450 break;
451 case MPCG_STATE_XID2INITW:
452 /* alloc channel was called but no XID exchange */
453 /* has occurred. initiate xside XID exchange */
454 /* make sure yside XID0 processing has not started */
aa3f2cb6 455
293d984f
PT		 456 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
457 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
aa3f2cb6
PT		 458 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
459 "%s(%s): ABORT - PASSIVE XID",
460 CTCM_FUNTAIL, dev->name);
293d984f
PT		 461 break;
462 }
463 grp->send_qllc_disc = 1;
464 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
465 fsm_deltimer(&grp->timer);
466 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
467 MPCG_EVENT_TIMER, dev);
468 grp->outstanding_xid7 = 0;
469 grp->outstanding_xid7_p2 = 0;
470 grp->saved_xid2 = NULL;
471 if ((rch->in_mpcgroup) &&
472 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
473 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
474 else {
aa3f2cb6
PT		 475 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
476 "%s(%s): RX-%s not ready for ACTIVE XID0",
477 CTCM_FUNTAIL, dev->name, rch->id);
293d984f
PT		 478 if (grp->estconnfunc) {
479 grp->estconnfunc(grp->port_num, -1, 0);
480 grp->estconnfunc = NULL;
481 }
482 fsm_deltimer(&grp->timer);
483 goto done;
484 }
485 if ((wch->in_mpcgroup) &&
486 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
487 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
488 else {
aa3f2cb6
PT		 489 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
490 "%s(%s): WX-%s not ready for ACTIVE XID0",
491 CTCM_FUNTAIL, dev->name, wch->id);
293d984f
PT		 492 if (grp->estconnfunc) {
493 grp->estconnfunc(grp->port_num, -1, 0);
494 grp->estconnfunc = NULL;
495 }
496 fsm_deltimer(&grp->timer);
497 goto done;
498 }
499 break;
500 case MPCG_STATE_XID0IOWAIT:
501 /* already in active XID negotiations */
502 default:
503 break;
504 }
505
506done:
aa3f2cb6 507 CTCM_PR_DEBUG("Exit %s()\n", __func__);
293d984f
PT		 508 return;
509}
510EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
511
512/*
513 * ctc_mpc_dealloc_ch
514 * (exported interface)
515 */
516void ctc_mpc_dealloc_ch(int port_num)
517{
518 struct net_device *dev;
293d984f
PT		 519 struct ctcm_priv *priv;
520 struct mpc_group *grp;
521
aa3f2cb6
PT		 522 dev = ctcmpc_get_dev(port_num);
523 if (dev == NULL)
524 return;
261893d3 525 priv = dev->ml_priv;
aa3f2cb6 526 grp = priv->mpcg;
293d984f 527
aa3f2cb6
PT		 528 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
529 "%s: %s: refcount = %d\n",
9fbb711e 530 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
293d984f 531
293d984f 532 fsm_deltimer(&priv->restart_timer);
293d984f 533 grp->channels_terminating = 0;
293d984f 534 fsm_deltimer(&grp->timer);
293d984f
PT		 535 grp->allochanfunc = NULL;
536 grp->estconnfunc = NULL;
537 grp->port_persist = 0;
538 grp->send_qllc_disc = 0;
539 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
540
541 ctcm_close(dev);
293d984f
PT		 542 return;
543}
544EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
545
546/*
547 * ctc_mpc_flow_control
548 * (exported interface)
549 */
550void ctc_mpc_flow_control(int port_num, int flowc)
551{
293d984f
PT		 552 struct ctcm_priv *priv;
553 struct mpc_group *grp;
554 struct net_device *dev;
555 struct channel *rch;
556 int mpcg_state;
557
aa3f2cb6
PT		 558 dev = ctcmpc_get_dev(port_num);
559 if (dev == NULL)
293d984f 560 return;
261893d3 561 priv = dev->ml_priv;
aa3f2cb6 562 grp = priv->mpcg;
293d984f 563
aa3f2cb6
PT		 564 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
565 "%s: %s: flowc = %d",
566 CTCM_FUNTAIL, dev->name, flowc);
293d984f 567
3c09e264 568 rch = priv->channel[CTCM_READ];
293d984f
PT		 569
570 mpcg_state = fsm_getstate(grp->fsm);
571 switch (flowc) {
572 case 1:
573 if (mpcg_state == MPCG_STATE_FLOWC)
574 break;
575 if (mpcg_state == MPCG_STATE_READY) {
576 if (grp->flow_off_called == 1)
577 grp->flow_off_called = 0;
578 else
579 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
580 break;
581 }
582 break;
583 case 0:
584 if (mpcg_state == MPCG_STATE_FLOWC) {
585 fsm_newstate(grp->fsm, MPCG_STATE_READY);
586 /* ensure any data that has accumulated */
587 /* on the io_queue will now be sen t */
588 tasklet_schedule(&rch->ch_tasklet);
589 }
590 /* possible race condition */
591 if (mpcg_state == MPCG_STATE_READY) {
592 grp->flow_off_called = 1;
593 break;
594 }
595 break;
596 }
597
293d984f
PT		 598}
599EXPORT_SYMBOL(ctc_mpc_flow_control);
600
601static int mpc_send_qllc_discontact(struct net_device *);
602
603/*
604 * helper function of ctcmpc_unpack_skb
605*/
606static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
607{
608 struct channel *rch = mpcginfo->ch;
609 struct net_device *dev = rch->netdev;
261893d3 610 struct ctcm_priv *priv = dev->ml_priv;
293d984f 611 struct mpc_group *grp = priv->mpcg;
3c09e264 612 struct channel *ch = priv->channel[CTCM_WRITE];
293d984f 613
aa3f2cb6
PT		 614 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
615 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
293d984f
PT		 616
617 grp->sweep_rsp_pend_num--;
618
619 if ((grp->sweep_req_pend_num == 0) &&
620 (grp->sweep_rsp_pend_num == 0)) {
621 fsm_deltimer(&ch->sweep_timer);
622 grp->in_sweep = 0;
623 rch->th_seq_num = 0x00;
624 ch->th_seq_num = 0x00;
625 ctcm_clear_busy_do(dev);
626 }
627
628 kfree(mpcginfo);
629
630 return;
631
632}
633
634/*
635 * helper function of mpc_rcvd_sweep_req
636 * which is a helper of ctcmpc_unpack_skb
637 */
638static void ctcmpc_send_sweep_resp(struct channel *rch)
639{
640 struct net_device *dev = rch->netdev;
261893d3 641 struct ctcm_priv *priv = dev->ml_priv;
293d984f 642 struct mpc_group *grp = priv->mpcg;
293d984f
PT		 643 struct th_sweep *header;
644 struct sk_buff *sweep_skb;
3c09e264 645 struct channel *ch = priv->channel[CTCM_WRITE];
293d984f 646
aa3f2cb6 647 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
293d984f 648
aa3f2cb6 649 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
293d984f 650 if (sweep_skb == NULL) {
aa3f2cb6
PT		 651 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
652 "%s(%s): sweep_skb allocation ERROR\n",
653 CTCM_FUNTAIL, rch->id);
ff2aed7d 654 goto done;
293d984f
PT		 655 }
656
ae57b20a 657 header = kmalloc(sizeof(struct th_sweep), gfp_type());
293d984f
PT		 658
659 if (!header) {
660 dev_kfree_skb_any(sweep_skb);
ff2aed7d 661 goto done;
293d984f
PT		 662 }
663
664 header->th.th_seg = 0x00 ;
665 header->th.th_ch_flag = TH_SWEEP_RESP;
666 header->th.th_blk_flag = 0x00;
667 header->th.th_is_xid = 0x00;
668 header->th.th_seq_num = 0x00;
669 header->sw.th_last_seq = ch->th_seq_num;
670
59ae1d12 671 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
293d984f
PT		 672
673 kfree(header);
674
860e9538 675 netif_trans_update(dev);
293d984f
PT		 676 skb_queue_tail(&ch->sweep_queue, sweep_skb);
677
678 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
679
680 return;
681
682done:
e2fc8cb4
JF		 683 grp->in_sweep = 0;
684 ctcm_clear_busy_do(dev);
685 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
293d984f
PT		 686
687 return;
688}
689
690/*
691 * helper function of ctcmpc_unpack_skb
692 */
693static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
694{
695 struct channel *rch = mpcginfo->ch;
696 struct net_device *dev = rch->netdev;
261893d3 697 struct ctcm_priv *priv = dev->ml_priv;
293d984f 698 struct mpc_group *grp = priv->mpcg;
3c09e264 699 struct channel *ch = priv->channel[CTCM_WRITE];
293d984f
PT		 700
701 if (do_debug)
702 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
aa3f2cb6 703 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
293d984f
PT		 704
705 if (grp->in_sweep == 0) {
706 grp->in_sweep = 1;
707 ctcm_test_and_set_busy(dev);
3c09e264
UB		 708 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
709 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
293d984f
PT		 710 }
711
aa3f2cb6 712 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
293d984f
PT		 713
714 grp->sweep_req_pend_num--;
715 ctcmpc_send_sweep_resp(ch);
716 kfree(mpcginfo);
717 return;
718}
719
720/*
721 * MPC Group Station FSM definitions
722 */
723static const char *mpcg_event_names[] = {
724 [MPCG_EVENT_INOP] = "INOP Condition",
725 [MPCG_EVENT_DISCONC] = "Discontact Received",
726 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
727 [MPCG_EVENT_XID2] = "XID2 Received",
728 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
729 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
730 [MPCG_EVENT_TIMER] = "XID Setup Timer",
731 [MPCG_EVENT_DOIO] = "XID DoIO",
732};
733
734static const char *mpcg_state_names[] = {
735 [MPCG_STATE_RESET] = "Reset",
736 [MPCG_STATE_INOP] = "INOP",
737 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
738 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
739 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
740 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
741 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
742 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
743 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
744 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
745 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
746 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
747 [MPCG_STATE_READY] = "READY",
748};
749
750/*
751 * The MPC Group Station FSM
752 * 22 events
753 */
754static const fsm_node mpcg_fsm[] = {
755 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
756 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
757 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
758
759 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
760 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
761
762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
763 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
764 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
765 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
766 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
767
768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
769 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
770 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
771 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
772 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
773
774 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
775 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
776 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
777 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
778 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
779 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
780 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
781
782 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
783 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
784 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
785 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
786 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
787 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
788
789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
794 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
795
796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
801 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
802
803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
804 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
805 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
806 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
807 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
808 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
809 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
810
811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
816 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
817
818 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
819 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
820};
821
822static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
823
824/*
825 * MPC Group Station FSM action
826 * CTCM_PROTO_MPC only
827 */
828static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
829{
830 struct net_device *dev = arg;
261893d3 831 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 832 struct mpc_group *grp = priv->mpcg;
293d984f 833
293d984f 834 if (grp == NULL) {
aa3f2cb6
PT		 835 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
836 "%s(%s): No MPC group",
837 CTCM_FUNTAIL, dev->name);
293d984f
PT		 838 return;
839 }
840
841 fsm_deltimer(&grp->timer);
842
843 if (grp->saved_xid2->xid2_flag2 == 0x40) {
844 priv->xid->xid2_flag2 = 0x00;
845 if (grp->estconnfunc) {
846 grp->estconnfunc(grp->port_num, 1,
847 grp->group_max_buflen);
848 grp->estconnfunc = NULL;
849 } else if (grp->allochanfunc)
850 grp->send_qllc_disc = 1;
aa3f2cb6
PT		 851
852 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
854 "%s(%s): fails",
855 CTCM_FUNTAIL, dev->name);
856 return;
293d984f
PT		 857 }
858
859 grp->port_persist = 1;
860 grp->out_of_sequence = 0;
861 grp->estconn_called = 0;
862
863 tasklet_hi_schedule(&grp->mpc_tasklet2);
864
293d984f 865 return;
293d984f
PT		 866}
867
868/*
869 * helper of ctcm_init_netdevice
870 * CTCM_PROTO_MPC only
871 */
872void mpc_group_ready(unsigned long adev)
873{
874 struct net_device *dev = (struct net_device *)adev;
261893d3 875 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 876 struct mpc_group *grp = priv->mpcg;
293d984f
PT		 877 struct channel *ch = NULL;
878
293d984f 879 if (grp == NULL) {
aa3f2cb6
PT		 880 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
881 "%s(%s): No MPC group",
882 CTCM_FUNTAIL, dev->name);
293d984f
PT		 883 return;
884 }
885
aa3f2cb6
PT		 886 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
887 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
888 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
293d984f
PT		 889
890 fsm_newstate(grp->fsm, MPCG_STATE_READY);
891
892 /* Put up a read on the channel */
3c09e264 893 ch = priv->channel[CTCM_READ];
293d984f 894 ch->pdu_seq = 0;
aa3f2cb6
PT		 895 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
896 __func__, ch->pdu_seq);
293d984f
PT		 897
898 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
899 /* Put the write channel in idle state */
3c09e264 900 ch = priv->channel[CTCM_WRITE];
293d984f
PT		 901 if (ch->collect_len > 0) {
902 spin_lock(&ch->collect_lock);
903 ctcm_purge_skb_queue(&ch->collect_queue);
904 ch->collect_len = 0;
905 spin_unlock(&ch->collect_lock);
906 }
907 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
293d984f
PT		 908 ctcm_clear_busy(dev);
909
910 if (grp->estconnfunc) {
911 grp->estconnfunc(grp->port_num, 0,
912 grp->group_max_buflen);
913 grp->estconnfunc = NULL;
aa3f2cb6
PT		 914 } else if (grp->allochanfunc)
915 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
293d984f
PT		 916
917 grp->send_qllc_disc = 1;
918 grp->changed_side = 0;
919
293d984f
PT		 920 return;
921
922}
923
924/*
925 * Increment the MPC Group Active Channel Counts
926 * helper of dev_action (called from channel fsm)
927 */
aa3f2cb6 928void mpc_channel_action(struct channel *ch, int direction, int action)
293d984f 929{
aa3f2cb6 930 struct net_device *dev = ch->netdev;
261893d3 931 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 932 struct mpc_group *grp = priv->mpcg;
293d984f
PT		 933
934 if (grp == NULL) {
aa3f2cb6
PT		 935 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
936 "%s(%s): No MPC group",
937 CTCM_FUNTAIL, dev->name);
938 return;
293d984f
PT		 939 }
940
aa3f2cb6
PT		 941 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
942
943 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
944 "%s: %i / Grp:%s total_channels=%i, active_channels: "
945 "read=%i, write=%i\n", __func__, action,
946 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
3c09e264
UB		 947 grp->active_channels[CTCM_READ],
948 grp->active_channels[CTCM_WRITE]);
293d984f
PT		 949
950 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
951 grp->num_channel_paths++;
952 grp->active_channels[direction]++;
953 grp->outstanding_xid2++;
954 ch->in_mpcgroup = 1;
955
956 if (ch->xid_skb != NULL)
957 dev_kfree_skb_any(ch->xid_skb);
958
959 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
960 GFP_ATOMIC | GFP_DMA);
961 if (ch->xid_skb == NULL) {
aa3f2cb6
PT		 962 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
963 "%s(%s): Couldn't alloc ch xid_skb\n",
964 CTCM_FUNTAIL, dev->name);
293d984f 965 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
aa3f2cb6 966 return;
293d984f
PT		 967 }
968 ch->xid_skb_data = ch->xid_skb->data;
969 ch->xid_th = (struct th_header *)ch->xid_skb->data;
970 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
971 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
972 skb_put(ch->xid_skb, XID2_LENGTH);
973 ch->xid_id = skb_tail_pointer(ch->xid_skb);
974 ch->xid_skb->data = ch->xid_skb_data;
975 skb_reset_tail_pointer(ch->xid_skb);
976 ch->xid_skb->len = 0;
977
59ae1d12
JB		 978 skb_put_data(ch->xid_skb, grp->xid_skb->data,
979 grp->xid_skb->len);
293d984f 980
3c09e264
UB		 981 ch->xid->xid2_dlc_type =
982 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
293d984f
PT		 983 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
984
3c09e264 985 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
293d984f
PT		 986 ch->xid->xid2_buf_len = 0x00;
987
988 ch->xid_skb->data = ch->xid_skb_data;
989 skb_reset_tail_pointer(ch->xid_skb);
990 ch->xid_skb->len = 0;
991
992 fsm_newstate(ch->fsm, CH_XID0_PENDING);
993
3c09e264
UB		 994 if ((grp->active_channels[CTCM_READ] > 0) &&
995 (grp->active_channels[CTCM_WRITE] > 0) &&
293d984f
PT		 996 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
997 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
aa3f2cb6
PT		 998 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
999 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1000 __func__, dev->name);
293d984f
PT		 1001 }
1002 } else if ((action == MPC_CHANNEL_REMOVE) &&
1003 (ch->in_mpcgroup == 1)) {
1004 ch->in_mpcgroup = 0;
1005 grp->num_channel_paths--;
1006 grp->active_channels[direction]--;
1007
1008 if (ch->xid_skb != NULL)
1009 dev_kfree_skb_any(ch->xid_skb);
1010 ch->xid_skb = NULL;
1011
1012 if (grp->channels_terminating)
1013 goto done;
1014
3c09e264
UB		 1015 if (((grp->active_channels[CTCM_READ] == 0) &&
1016 (grp->active_channels[CTCM_WRITE] > 0))
1017 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1018 (grp->active_channels[CTCM_READ] > 0)))
293d984f
PT		 1019 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1020 }
293d984f 1021done:
aa3f2cb6
PT		 1022 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1023 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1024 "read=%i, write=%i\n", __func__, action,
1025 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
3c09e264
UB		 1026 grp->active_channels[CTCM_READ],
1027 grp->active_channels[CTCM_WRITE]);
293d984f 1028
aa3f2cb6 1029 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
293d984f
PT		 1030}
1031
1032/**
1033 * Unpack a just received skb and hand it over to
1034 * upper layers.
1035 * special MPC version of unpack_skb.
1036 *
1037 * ch The channel where this skb has been received.
1038 * pskb The received skb.
1039 */
1040static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1041{
1042 struct net_device *dev = ch->netdev;
261893d3 1043 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 1044 struct mpc_group *grp = priv->mpcg;
1045 struct pdu *curr_pdu;
1046 struct mpcg_info *mpcginfo;
1047 struct th_header *header = NULL;
1048 struct th_sweep *sweep = NULL;
1049 int pdu_last_seen = 0;
1050 __u32 new_len;
1051 struct sk_buff *skb;
1052 int skblen;
1053 int sendrc = 0;
1054
aa3f2cb6
PT		 1055 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1056 __func__, dev->name, smp_processor_id(), ch->id);
293d984f
PT		 1057
1058 header = (struct th_header *)pskb->data;
1059 if ((header->th_seg == 0) &&
1060 (header->th_ch_flag == 0) &&
1061 (header->th_blk_flag == 0) &&
1062 (header->th_seq_num == 0))
1063 /* nothing for us */ goto done;
1064
aa3f2cb6
PT		 1065 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1066 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1067 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
293d984f
PT		 1068
1069 pskb->dev = dev;
1070 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1071 skb_pull(pskb, TH_HEADER_LENGTH);
1072
1073 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
aa3f2cb6 1074 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
293d984f
PT		 1075 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1076 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1077 (header->th_seq_num != ch->th_seq_num + 1) &&
1078 (ch->th_seq_num != 0))) {
1079 /* This is NOT the next segment *
1080 * we are not the correct race winner *
1081 * go away and let someone else win *
1082 * BUT..this only applies if xid negot *
1083 * is done *
1084 */
1085 grp->out_of_sequence += 1;
1086 __skb_push(pskb, TH_HEADER_LENGTH);
1087 skb_queue_tail(&ch->io_queue, pskb);
aa3f2cb6
PT		 1088 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1089 "got:%08x\n", __func__,
1090 ch->th_seq_num + 1, header->th_seq_num);
293d984f
PT		 1091
1092 return;
1093 }
1094 grp->out_of_sequence = 0;
1095 ch->th_seq_num = header->th_seq_num;
1096
aa3f2cb6
PT		 1097 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1098 __func__, ch->th_seq_num);
293d984f
PT		 1099
1100 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1101 goto done;
293d984f
PT		 1102 while ((pskb->len > 0) && !pdu_last_seen) {
1103 curr_pdu = (struct pdu *)pskb->data;
aa3f2cb6
PT		 1104
1105 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1106 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1107 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1108 __func__, pskb->len);
1109
293d984f
PT		 1110 skb_pull(pskb, PDU_HEADER_LENGTH);
1111
1112 if (curr_pdu->pdu_flag & PDU_LAST)
1113 pdu_last_seen = 1;
1114 if (curr_pdu->pdu_flag & PDU_CNTL)
1115 pskb->protocol = htons(ETH_P_SNAP);
1116 else
1117 pskb->protocol = htons(ETH_P_SNA_DIX);
1118
1119 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
aa3f2cb6
PT		 1120 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1121 "%s(%s): Dropping packet with "
1122 "illegal siize %d",
1123 CTCM_FUNTAIL, dev->name, pskb->len);
1124
293d984f
PT		 1125 priv->stats.rx_dropped++;
1126 priv->stats.rx_length_errors++;
1127 goto done;
1128 }
1129 skb_reset_mac_header(pskb);
1130 new_len = curr_pdu->pdu_offset;
aa3f2cb6
PT		 1131 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1132 __func__, new_len);
293d984f
PT		 1133 if ((new_len == 0) || (new_len > pskb->len)) {
1134 /* should never happen */
1135 /* pskb len must be hosed...bail out */
aa3f2cb6
PT		 1136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137 "%s(%s): non valid pdu_offset: %04x",
1138 /* "data may be lost", */
1139 CTCM_FUNTAIL, dev->name, new_len);
1140 goto done;
293d984f
PT		 1141 }
1142 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1143
1144 if (!skb) {
aa3f2cb6
PT		 1145 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1146 "%s(%s): MEMORY allocation error",
1147 CTCM_FUNTAIL, dev->name);
293d984f 1148 priv->stats.rx_dropped++;
aa3f2cb6 1149 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
293d984f
PT		 1150 goto done;
1151 }
59ae1d12 1152 skb_put_data(skb, pskb->data, new_len);
293d984f
PT		 1153
1154 skb_reset_mac_header(skb);
1155 skb->dev = pskb->dev;
1156 skb->protocol = pskb->protocol;
1157 skb->ip_summed = CHECKSUM_UNNECESSARY;
1158 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1159 ch->pdu_seq++;
1160
293d984f 1161 if (do_debug_data) {
aa3f2cb6
PT		 1162 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1163 __func__, ch->pdu_seq);
1164 ctcm_pr_debug("%s: skb:%0lx "
1165 "skb len: %d \n", __func__,
1166 (unsigned long)skb, skb->len);
1167 ctcm_pr_debug("%s: up to 32 bytes "
1168 "of pdu_data sent\n", __func__);
293d984f
PT		 1169 ctcmpc_dump32((char *)skb->data, skb->len);
1170 }
1171
1172 skblen = skb->len;
1173 sendrc = netif_rx(skb);
1174 priv->stats.rx_packets++;
1175 priv->stats.rx_bytes += skblen;
1176 skb_pull(pskb, new_len); /* point to next PDU */
1177 }
1178 } else {
ae57b20a 1179 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
293d984f
PT		 1180 if (mpcginfo == NULL)
1181 goto done;
1182
1183 mpcginfo->ch = ch;
1184 mpcginfo->th = header;
1185 mpcginfo->skb = pskb;
aa3f2cb6
PT		 1186 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1187 __func__);
293d984f
PT		 1188 /* it's a sweep? */
1189 sweep = (struct th_sweep *)pskb->data;
1190 mpcginfo->sweep = sweep;
1191 if (header->th_ch_flag == TH_SWEEP_REQ)
1192 mpc_rcvd_sweep_req(mpcginfo);
1193 else if (header->th_ch_flag == TH_SWEEP_RESP)
1194 mpc_rcvd_sweep_resp(mpcginfo);
1195 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1196 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1197 skb_pull(pskb, XID2_LENGTH);
1198 mpcginfo->xid = thisxid;
1199 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1200 } else if (header->th_blk_flag == TH_DISCONTACT)
1201 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1202 else if (header->th_seq_num != 0) {
aa3f2cb6
PT		 1203 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1204 "%s(%s): control pkt expected\n",
1205 CTCM_FUNTAIL, dev->name);
293d984f
PT		 1206 priv->stats.rx_dropped++;
1207 /* mpcginfo only used for non-data transfers */
1208 kfree(mpcginfo);
1209 if (do_debug_data)
1210 ctcmpc_dump_skb(pskb, -8);
1211 }
1212 }
1213done:
1214
1215 dev_kfree_skb_any(pskb);
1216 if (sendrc == NET_RX_DROP) {
2a7c6f2c
PT		 1217 dev_warn(&dev->dev,
1218 "The network backlog for %s is exceeded, "
1219 "package dropped\n", __func__);
293d984f
PT		 1220 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1221 }
1222
aa3f2cb6
PT		 1223 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1224 __func__, dev->name, ch, ch->id);
293d984f
PT		 1225}
1226
1227/**
1228 * tasklet helper for mpc's skb unpacking.
1229 *
1230 * ch The channel to work on.
1231 * Allow flow control back pressure to occur here.
1232 * Throttling back channel can result in excessive
1233 * channel inactivity and system deact of channel
1234 */
1235void ctcmpc_bh(unsigned long thischan)
1236{
aa3f2cb6 1237 struct channel *ch = (struct channel *)thischan;
293d984f 1238 struct sk_buff *skb;
aa3f2cb6 1239 struct net_device *dev = ch->netdev;
261893d3 1240 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 1241 struct mpc_group *grp = priv->mpcg;
293d984f 1242
aa3f2cb6
PT		 1243 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1244 dev->name, smp_processor_id(), __func__, ch->id);
293d984f
PT		 1245 /* caller has requested driver to throttle back */
1246 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1247 (skb = skb_dequeue(&ch->io_queue))) {
1248 ctcmpc_unpack_skb(ch, skb);
1249 if (grp->out_of_sequence > 20) {
1250 /* assume data loss has occurred if */
1251 /* missing seq_num for extended */
1252 /* period of time */
1253 grp->out_of_sequence = 0;
1254 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1255 break;
1256 }
1257 if (skb == skb_peek(&ch->io_queue))
1258 break;
1259 }
aa3f2cb6
PT		 1260 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1261 __func__, dev->name, ch, ch->id);
293d984f
PT		 1262 return;
1263}
1264
1265/*
1266 * MPC Group Initializations
1267 */
1268struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1269{
1270 struct mpc_group *grp;
1271
aa3f2cb6
PT		 1272 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1273 "Enter %s(%p)", CTCM_FUNTAIL, priv);
293d984f
PT		 1274
1275 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1276 if (grp == NULL)
1277 return NULL;
1278
aa3f2cb6
PT		 1279 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1280 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1281 mpcg_fsm_len, GFP_KERNEL);
293d984f
PT		 1282 if (grp->fsm == NULL) {
1283 kfree(grp);
1284 return NULL;
1285 }
1286
1287 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1288 fsm_settimer(grp->fsm, &grp->timer);
1289
1290 grp->xid_skb =
1291 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1292 if (grp->xid_skb == NULL) {
293d984f
PT		 1293 kfree_fsm(grp->fsm);
1294 kfree(grp);
1295 return NULL;
1296 }
1297 /* base xid for all channels in group */
1298 grp->xid_skb_data = grp->xid_skb->data;
1299 grp->xid_th = (struct th_header *)grp->xid_skb->data;
59ae1d12 1300 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
293d984f 1301
aa3f2cb6 1302 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
59ae1d12 1303 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
293d984f
PT		 1304 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1305 grp->xid->xid2_sender_id = jiffies;
1306
1307 grp->xid_id = skb_tail_pointer(grp->xid_skb);
59ae1d12 1308 skb_put_data(grp->xid_skb, "VTAM", 4);
293d984f
PT		 1309
1310 grp->rcvd_xid_skb =
1311 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1312 if (grp->rcvd_xid_skb == NULL) {
293d984f
PT		 1313 kfree_fsm(grp->fsm);
1314 dev_kfree_skb(grp->xid_skb);
1315 kfree(grp);
1316 return NULL;
1317 }
1318 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1319 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
59ae1d12 1320 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
293d984f
PT		 1321 grp->saved_xid2 = NULL;
1322 priv->xid = grp->xid;
1323 priv->mpcg = grp;
1324 return grp;
1325}
1326
1327/*
1328 * The MPC Group Station FSM
1329 */
1330
1331/*
1332 * MPC Group Station FSM actions
1333 * CTCM_PROTO_MPC only
1334 */
1335
1336/**
1337 * NOP action for statemachines
1338 */
1339static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1340{
1341}
1342
1343/*
1344 * invoked when the device transitions to dev_stopped
1345 * MPC will stop each individual channel if a single XID failure
1346 * occurs, or will intitiate all channels be stopped if a GROUP
1347 * level failure occurs.
1348 */
1349static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1350{
1351 struct net_device *dev = arg;
1352 struct ctcm_priv *priv;
1353 struct mpc_group *grp;
ff2aed7d 1354 struct channel *wch;
293d984f 1355
aa3f2cb6 1356 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
293d984f 1357
261893d3 1358 priv = dev->ml_priv;
293d984f
PT		 1359 grp = priv->mpcg;
1360 grp->flow_off_called = 0;
293d984f 1361 fsm_deltimer(&grp->timer);
293d984f 1362 if (grp->channels_terminating)
aa3f2cb6 1363 return;
293d984f
PT		 1364
1365 grp->channels_terminating = 1;
293d984f
PT		 1366 grp->saved_state = fsm_getstate(grp->fsm);
1367 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1368 if (grp->saved_state > MPCG_STATE_XID7INITF)
aa3f2cb6
PT		 1369 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1370 "%s(%s): MPC GROUP INOPERATIVE",
1371 CTCM_FUNTAIL, dev->name);
293d984f
PT		 1372 if ((grp->saved_state != MPCG_STATE_RESET) ||
1373 /* dealloc_channel has been called */
e2fc8cb4 1374 (grp->port_persist == 0))
293d984f
PT		 1375 fsm_deltimer(&priv->restart_timer);
1376
3c09e264 1377 wch = priv->channel[CTCM_WRITE];
293d984f
PT		 1378
1379 switch (grp->saved_state) {
1380 case MPCG_STATE_RESET:
1381 case MPCG_STATE_INOP:
1382 case MPCG_STATE_XID2INITW:
1383 case MPCG_STATE_XID0IOWAIT:
1384 case MPCG_STATE_XID2INITX:
1385 case MPCG_STATE_XID7INITW:
1386 case MPCG_STATE_XID7INITX:
1387 case MPCG_STATE_XID0IOWAIX:
1388 case MPCG_STATE_XID7INITI:
1389 case MPCG_STATE_XID7INITZ:
1390 case MPCG_STATE_XID7INITF:
1391 break;
1392 case MPCG_STATE_FLOWC:
1393 case MPCG_STATE_READY:
1394 default:
1395 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1396 }
1397
1398 grp->xid2_tgnum = 0;
1399 grp->group_max_buflen = 0; /*min of all received */
1400 grp->outstanding_xid2 = 0;
1401 grp->outstanding_xid7 = 0;
1402 grp->outstanding_xid7_p2 = 0;
1403 grp->saved_xid2 = NULL;
1404 grp->xidnogood = 0;
1405 grp->changed_side = 0;
1406
1407 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1408 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1409 grp->rcvd_xid_skb->len = 0;
1410 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
59ae1d12 1411 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
293d984f
PT		 1412
1413 if (grp->send_qllc_disc == 1) {
1414 grp->send_qllc_disc = 0;
ff2aed7d 1415 mpc_send_qllc_discontact(dev);
293d984f
PT		 1416 }
1417
1418 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1419 /* This can result in INOP of VTAM PU due to halting of */
1420 /* outstanding IO which causes a sense to be returned */
1421 /* Only about 3 senses are allowed and then IOS/VTAM will*/
aa3f2cb6
PT		 1422 /* become unreachable without manual intervention */
1423 if ((grp->port_persist == 1) || (grp->alloc_called)) {
293d984f
PT		 1424 grp->alloc_called = 0;
1425 fsm_deltimer(&priv->restart_timer);
aa3f2cb6 1426 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
293d984f
PT		 1427 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1428 if (grp->saved_state > MPCG_STATE_XID7INITF)
aa3f2cb6
PT		 1429 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1430 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1431 CTCM_FUNTAIL, dev->name);
293d984f
PT		 1432 } else {
1433 fsm_deltimer(&priv->restart_timer);
1434 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1435 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
aa3f2cb6
PT		 1436 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1437 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1438 CTCM_FUNTAIL, dev->name);
293d984f 1439 }
293d984f
PT		 1440}
1441
1442/**
1443 * Handle mpc group action timeout.
1444 * MPC Group Station FSM action
1445 * CTCM_PROTO_MPC only
1446 *
1447 * fi An instance of an mpc_group fsm.
1448 * event The event, just happened.
1449 * arg Generic pointer, casted from net_device * upon call.
1450 */
1451static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1452{
1453 struct net_device *dev = arg;
1454 struct ctcm_priv *priv;
1455 struct mpc_group *grp;
1456 struct channel *wch;
1457 struct channel *rch;
1458
261893d3 1459 priv = dev->ml_priv;
293d984f 1460 grp = priv->mpcg;
3c09e264
UB		 1461 wch = priv->channel[CTCM_WRITE];
1462 rch = priv->channel[CTCM_READ];
293d984f
PT		 1463
1464 switch (fsm_getstate(grp->fsm)) {
1465 case MPCG_STATE_XID2INITW:
1466 /* Unless there is outstanding IO on the */
1467 /* channel just return and wait for ATTN */
1468 /* interrupt to begin XID negotiations */
1469 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1470 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1471 break;
1472 default:
1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1474 }
1475
aa3f2cb6
PT		 1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1477 "%s: dev=%s exit",
1478 CTCM_FUNTAIL, dev->name);
293d984f
PT		 1479 return;
1480}
1481
1482/*
1483 * MPC Group Station FSM action
1484 * CTCM_PROTO_MPC only
1485 */
1486void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1487{
1488 struct mpcg_info *mpcginfo = arg;
1489 struct channel *ch = mpcginfo->ch;
aa3f2cb6
PT		 1490 struct net_device *dev;
1491 struct ctcm_priv *priv;
1492 struct mpc_group *grp;
293d984f 1493
aa3f2cb6
PT		 1494 if (ch) {
1495 dev = ch->netdev;
1496 if (dev) {
261893d3 1497 priv = dev->ml_priv;
aa3f2cb6
PT		 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 }
293d984f
PT		 1507 }
1508
293d984f
PT		 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 */
1517void mpc_action_send_discontact(unsigned long thischan)
1518{
aa3f2cb6
PT		 1519 int rc;
1520 struct channel *ch = (struct channel *)thischan;
1521 unsigned long saveflags = 0;
293d984f
PT		 1522
1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1525 (unsigned long)ch, 0xff, 0);
1526 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1527
1528 if (rc != 0) {
aa3f2cb6 1529 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
293d984f
PT		 1530 }
1531
293d984f
PT		 1532 return;
1533}
1534
1535
1536/*
1537 * helper function of mpc FSM
1538 * CTCM_PROTO_MPC only
1539 * mpc_action_rcvd_xid7
1540*/
1541static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1542{
aa3f2cb6
PT		 1543 struct channel *ch = mpcginfo->ch;
1544 struct net_device *dev = ch->netdev;
261893d3 1545 struct ctcm_priv *priv = dev->ml_priv;
293d984f 1546 struct mpc_group *grp = priv->mpcg;
aa3f2cb6
PT		 1547 struct xid2 *xid = mpcginfo->xid;
1548 int rc = 0;
1549 __u64 our_id = 0;
1550 __u64 their_id = 0;
1551 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
293d984f 1552
aa3f2cb6 1553 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
293d984f 1554
aa3f2cb6 1555 if (xid == NULL) {
293d984f 1556 rc = 1;
aa3f2cb6
PT		 1557 /* XID REJECTED: xid == NULL */
1558 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1559 "%s(%s): xid = NULL",
1560 CTCM_FUNTAIL, ch->id);
1561 goto done;
293d984f
PT		 1562 }
1563
aa3f2cb6 1564 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
293d984f
PT		 1565
1566 /*the received direction should be the opposite of ours */
3c09e264 1567 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
293d984f 1568 XID2_READ_SIDE) != xid->xid2_dlc_type) {
aa3f2cb6
PT		 1569 rc = 2;
1570 /* XID REJECTED: r/w channel pairing mismatch */
1571 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1572 "%s(%s): r/w channel pairing mismatch",
1573 CTCM_FUNTAIL, ch->id);
1574 goto done;
293d984f
PT		 1575 }
1576
1577 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
aa3f2cb6
PT		 1578 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1579 grp->group_max_buflen, xid->xid2_buf_len);
293d984f 1580
aa3f2cb6
PT		 1581 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1582 xid->xid2_buf_len - len)
293d984f
PT		 1583 grp->group_max_buflen = xid->xid2_buf_len - len;
1584 }
1585
aa3f2cb6 1586 if (grp->saved_xid2 == NULL) {
293d984f
PT		 1587 grp->saved_xid2 =
1588 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1589
59ae1d12 1590 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
293d984f
PT		 1591 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1592
1593 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1594 grp->rcvd_xid_skb->len = 0;
1595
1596 /* convert two 32 bit numbers into 1 64 bit for id compare */
1597 our_id = (__u64)priv->xid->xid2_adj_id;
1598 our_id = our_id << 32;
1599 our_id = our_id + priv->xid->xid2_sender_id;
1600 their_id = (__u64)xid->xid2_adj_id;
1601 their_id = their_id << 32;
1602 their_id = their_id + xid->xid2_sender_id;
1603 /* lower id assume the xside role */
1604 if (our_id < their_id) {
1605 grp->roll = XSIDE;
aa3f2cb6
PT		 1606 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1607 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1608 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1609 } else {
1610 grp->roll = YSIDE;
aa3f2cb6
PT		 1611 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1612 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1613 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1614 }
1615
1616 } else {
1617 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
aa3f2cb6
PT		 1618 rc = 3;
1619 /* XID REJECTED: xid flag byte4 mismatch */
1620 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1621 "%s(%s): xid flag byte4 mismatch",
1622 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1623 }
1624 if (xid->xid2_flag2 == 0x40) {
aa3f2cb6
PT		 1625 rc = 4;
1626 /* XID REJECTED - xid NOGOOD */
1627 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1628 "%s(%s): xid NOGOOD",
1629 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1630 }
1631 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
aa3f2cb6
PT		 1632 rc = 5;
1633 /* XID REJECTED - Adjacent Station ID Mismatch */
1634 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1635 "%s(%s): Adjacent Station ID Mismatch",
1636 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1637 }
1638 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
aa3f2cb6
PT		 1639 rc = 6;
1640 /* XID REJECTED - Sender Address Mismatch */
1641 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1642 "%s(%s): Sender Address Mismatch",
1643 CTCM_FUNTAIL, ch->id);
293d984f
PT		 1644 }
1645 }
aa3f2cb6
PT		 1646done:
1647 if (rc) {
2a7c6f2c
PT		 1648 dev_warn(&dev->dev,
1649 "The XID used in the MPC protocol is not valid, "
1650 "rc = %d\n", rc);
293d984f
PT		 1651 priv->xid->xid2_flag2 = 0x40;
1652 grp->saved_xid2->xid2_flag2 = 0x40;
293d984f
PT		 1653 }
1654
293d984f
PT		 1655 return rc;
1656}
1657
1658/*
1659 * MPC Group Station FSM action
1660 * CTCM_PROTO_MPC only
1661 */
1662static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1663{
1664 struct channel *ch = arg;
293d984f
PT		 1665 int rc = 0;
1666 int gotlock = 0;
1667 unsigned long saveflags = 0; /* avoids compiler warning with
aa3f2cb6 1668 spin_unlock_irqrestore */
293d984f 1669
aa3f2cb6
PT		 1670 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1671 __func__, smp_processor_id(), ch, ch->id);
293d984f
PT		 1672
1673 if (ctcm_checkalloc_buffer(ch))
1674 goto done;
1675
aa3f2cb6
PT		 1676 /*
1677 * skb data-buffer referencing:
1678 */
293d984f
PT		 1679 ch->trans_skb->data = ch->trans_skb_data;
1680 skb_reset_tail_pointer(ch->trans_skb);
1681 ch->trans_skb->len = 0;
1682 /* result of the previous 3 statements is NOT always
1683 * already set after ctcm_checkalloc_buffer
1684 * because of possible reuse of the trans_skb
1685 */
1686 memset(ch->trans_skb->data, 0, 16);
1687 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1688 /* check is main purpose here: */
1689 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1690 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1691 /* check is main purpose here: */
1692 skb_put(ch->trans_skb, XID2_LENGTH);
1693 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1694 /* cleanup back to startpoint */
1695 ch->trans_skb->data = ch->trans_skb_data;
1696 skb_reset_tail_pointer(ch->trans_skb);
1697 ch->trans_skb->len = 0;
1698
1699 /* non-checking rewrite of above skb data-buffer referencing: */
1700 /*
1701 memset(ch->trans_skb->data, 0, 16);
1702 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1703 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1704 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1705 */
1706
1707 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1708 ch->ccw[8].count = 0;
1709 ch->ccw[8].cda = 0x00;
1710
aa3f2cb6
PT		 1711 if (!(ch->xid_th && ch->xid && ch->xid_id))
1712 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1713 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1714 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1715
293d984f
PT		 1716 if (side == XSIDE) {
1717 /* mpc_action_xside_xid */
aa3f2cb6
PT		 1718 if (ch->xid_th == NULL)
1719 goto done;
293d984f
PT		 1720 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1721 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1722 ch->ccw[9].count = TH_HEADER_LENGTH;
1723 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1724
aa3f2cb6
PT		 1725 if (ch->xid == NULL)
1726 goto done;
293d984f
PT		 1727 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1728 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1729 ch->ccw[10].count = XID2_LENGTH;
1730 ch->ccw[10].cda = virt_to_phys(ch->xid);
1731
1732 ch->ccw[11].cmd_code = CCW_CMD_READ;
1733 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1734 ch->ccw[11].count = TH_HEADER_LENGTH;
1735 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1736
1737 ch->ccw[12].cmd_code = CCW_CMD_READ;
1738 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1739 ch->ccw[12].count = XID2_LENGTH;
1740 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1741
1742 ch->ccw[13].cmd_code = CCW_CMD_READ;
1743 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1744
1745 } else { /* side == YSIDE : mpc_action_yside_xid */
1746 ch->ccw[9].cmd_code = CCW_CMD_READ;
1747 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1748 ch->ccw[9].count = TH_HEADER_LENGTH;
1749 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1750
1751 ch->ccw[10].cmd_code = CCW_CMD_READ;
1752 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1753 ch->ccw[10].count = XID2_LENGTH;
1754 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1755
aa3f2cb6
PT		 1756 if (ch->xid_th == NULL)
1757 goto done;
293d984f
PT		 1758 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1759 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1760 ch->ccw[11].count = TH_HEADER_LENGTH;
1761 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1762
aa3f2cb6
PT		 1763 if (ch->xid == NULL)
1764 goto done;
293d984f
PT		 1765 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1766 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1767 ch->ccw[12].count = XID2_LENGTH;
1768 ch->ccw[12].cda = virt_to_phys(ch->xid);
1769
aa3f2cb6
PT		 1770 if (ch->xid_id == NULL)
1771 goto done;
293d984f
PT		 1772 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1773 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1774
1775 }
1776 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1777 ch->ccw[13].count = 4;
1778
1779 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1780 ch->ccw[14].flags = CCW_FLAG_SLI;
1781 ch->ccw[14].count = 0;
1782 ch->ccw[14].cda = 0;
1783
aa3f2cb6
PT		 1784 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1785 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1786 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1787 CTCM_D3_DUMP((char *)ch->xid_id, 4);
293d984f 1788
293d984f
PT		 1789 if (!in_irq()) {
1790 /* Such conditional locking is a known problem for
1791 * sparse because its static undeterministic.
1792 * Warnings should be ignored here. */
1793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1794 gotlock = 1;
1795 }
1796
1797 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1798 rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1799 (unsigned long)ch, 0xff, 0);
1800
1801 if (gotlock) /* see remark above about conditional locking */
1802 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1803
1804 if (rc != 0) {
293d984f
PT		 1805 ctcm_ccw_check_rc(ch, rc,
1806 (side == XSIDE) ? "x-side XID" : "y-side XID");
1807 }
1808
1809done:
aa3f2cb6
PT		 1810 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1811 __func__, ch, ch->id);
293d984f
PT		 1812 return;
1813
1814}
1815
1816/*
1817 * MPC Group Station FSM action
1818 * CTCM_PROTO_MPC only
1819 */
1820static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1821{
1822 mpc_action_side_xid(fsm, arg, XSIDE);
1823}
1824
1825/*
1826 * MPC Group Station FSM action
1827 * CTCM_PROTO_MPC only
1828 */
1829static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1830{
1831 mpc_action_side_xid(fsm, arg, YSIDE);
1832}
1833
1834/*
1835 * MPC Group Station FSM action
1836 * CTCM_PROTO_MPC only
1837 */
1838static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1839{
aa3f2cb6
PT		 1840 struct channel *ch = arg;
1841 struct net_device *dev = ch->netdev;
261893d3 1842 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 1843 struct mpc_group *grp = priv->mpcg;
293d984f 1844
aa3f2cb6
PT		 1845 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1846 __func__, smp_processor_id(), ch, ch->id);
293d984f
PT		 1847
1848 if (ch->xid == NULL) {
aa3f2cb6
PT		 1849 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1850 "%s(%s): ch->xid == NULL",
1851 CTCM_FUNTAIL, dev->name);
1852 return;
293d984f
PT		 1853 }
1854
1855 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1856
1857 ch->xid->xid2_option = XID2_0;
1858
1859 switch (fsm_getstate(grp->fsm)) {
1860 case MPCG_STATE_XID2INITW:
1861 case MPCG_STATE_XID2INITX:
1862 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1863 break;
1864 case MPCG_STATE_XID0IOWAIT:
1865 case MPCG_STATE_XID0IOWAIX:
1866 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1867 break;
1868 }
1869
1870 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1871
293d984f 1872 return;
293d984f
PT		 1873}
1874
1875/*
1876 * MPC Group Station FSM action
1877 * CTCM_PROTO_MPC only
1878*/
1879static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1880{
1881 struct net_device *dev = arg;
261893d3 1882 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 1883 struct mpc_group *grp = NULL;
293d984f 1884 int direction;
293d984f
PT		 1885 int send = 0;
1886
aa3f2cb6
PT		 1887 if (priv)
1888 grp = priv->mpcg;
e2fc8cb4 1889 if (grp == NULL)
aa3f2cb6 1890 return;
293d984f 1891
3c09e264 1892 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
293d984f
PT		 1893 struct channel *ch = priv->channel[direction];
1894 struct xid2 *thisxid = ch->xid;
1895 ch->xid_skb->data = ch->xid_skb_data;
1896 skb_reset_tail_pointer(ch->xid_skb);
1897 ch->xid_skb->len = 0;
1898 thisxid->xid2_option = XID2_7;
1899 send = 0;
1900
1901 /* xid7 phase 1 */
1902 if (grp->outstanding_xid7_p2 > 0) {
1903 if (grp->roll == YSIDE) {
1904 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1905 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1906 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
59ae1d12
JB		 1907 skb_put_data(ch->xid_skb, &thdummy,
1908 TH_HEADER_LENGTH);
293d984f
PT		 1909 send = 1;
1910 }
1911 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1912 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1913 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
59ae1d12
JB		 1914 skb_put_data(ch->xid_skb, &thnorm,
1915 TH_HEADER_LENGTH);
293d984f
PT		 1916 send = 1;
1917 }
1918 } else {
1919 /* xid7 phase 2 */
1920 if (grp->roll == YSIDE) {
1921 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1922 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
59ae1d12
JB		 1923 skb_put_data(ch->xid_skb, &thnorm,
1924 TH_HEADER_LENGTH);
293d984f
PT		 1925 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1926 send = 1;
1927 }
1928 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1929 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1930 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
59ae1d12
JB		 1931 skb_put_data(ch->xid_skb, &thdummy,
1932 TH_HEADER_LENGTH);
293d984f
PT		 1933 send = 1;
1934 }
1935 }
1936
1937 if (send)
1938 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1939 }
1940
293d984f
PT		 1941 return;
1942}
1943
1944/*
1945 * MPC Group Station FSM action
1946 * CTCM_PROTO_MPC only
1947 */
1948static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1949{
1950
aa3f2cb6
PT		 1951 struct mpcg_info *mpcginfo = arg;
1952 struct channel *ch = mpcginfo->ch;
1953 struct net_device *dev = ch->netdev;
261893d3 1954 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 1955 struct mpc_group *grp = priv->mpcg;
293d984f 1956
aa3f2cb6
PT		 1957 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1958 __func__, ch->id, grp->outstanding_xid2,
1959 grp->outstanding_xid7, grp->outstanding_xid7_p2);
293d984f
PT		 1960
1961 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1962 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1963
1964 grp->outstanding_xid2--;
1965 grp->outstanding_xid7++;
1966 grp->outstanding_xid7_p2++;
1967
1968 /* must change state before validating xid to */
1969 /* properly handle interim interrupts received*/
1970 switch (fsm_getstate(grp->fsm)) {
1971 case MPCG_STATE_XID2INITW:
1972 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1973 mpc_validate_xid(mpcginfo);
1974 break;
1975 case MPCG_STATE_XID0IOWAIT:
1976 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1977 mpc_validate_xid(mpcginfo);
1978 break;
1979 case MPCG_STATE_XID2INITX:
1980 if (grp->outstanding_xid2 == 0) {
1981 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1982 mpc_validate_xid(mpcginfo);
1983 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1984 }
1985 break;
1986 case MPCG_STATE_XID0IOWAIX:
1987 if (grp->outstanding_xid2 == 0) {
1988 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1989 mpc_validate_xid(mpcginfo);
1990 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991 }
1992 break;
1993 }
1994 kfree(mpcginfo);
1995
aa3f2cb6
PT		 1996 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1997 __func__, ch->id, grp->outstanding_xid2,
1998 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1999 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2000 __func__, ch->id,
2001 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
293d984f
PT		 2002 return;
2003
2004}
2005
2006
2007/*
2008 * MPC Group Station FSM action
2009 * CTCM_PROTO_MPC only
2010 */
2011static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2012{
2013 struct mpcg_info *mpcginfo = arg;
2014 struct channel *ch = mpcginfo->ch;
2015 struct net_device *dev = ch->netdev;
261893d3 2016 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 2017 struct mpc_group *grp = priv->mpcg;
2018
aa3f2cb6
PT		 2019 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2020 __func__, smp_processor_id(), ch, ch->id);
2021 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2022 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
293d984f
PT		 2023
2024 grp->outstanding_xid7--;
2025 ch->xid_skb->data = ch->xid_skb_data;
2026 skb_reset_tail_pointer(ch->xid_skb);
2027 ch->xid_skb->len = 0;
2028
2029 switch (fsm_getstate(grp->fsm)) {
2030 case MPCG_STATE_XID7INITI:
2031 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2032 mpc_validate_xid(mpcginfo);
2033 break;
2034 case MPCG_STATE_XID7INITW:
2035 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2036 mpc_validate_xid(mpcginfo);
2037 break;
2038 case MPCG_STATE_XID7INITZ:
2039 case MPCG_STATE_XID7INITX:
2040 if (grp->outstanding_xid7 == 0) {
2041 if (grp->outstanding_xid7_p2 > 0) {
2042 grp->outstanding_xid7 =
2043 grp->outstanding_xid7_p2;
2044 grp->outstanding_xid7_p2 = 0;
2045 } else
2046 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2047
2048 mpc_validate_xid(mpcginfo);
2049 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2050 break;
2051 }
2052 mpc_validate_xid(mpcginfo);
2053 break;
2054 }
293d984f 2055 kfree(mpcginfo);
293d984f 2056 return;
293d984f
PT		 2057}
2058
2059/*
2060 * mpc_action helper of an MPC Group Station FSM action
2061 * CTCM_PROTO_MPC only
2062 */
2063static int mpc_send_qllc_discontact(struct net_device *dev)
2064{
293d984f
PT		 2065 __u32 new_len = 0;
2066 struct sk_buff *skb;
2067 struct qllc *qllcptr;
261893d3 2068 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 2069 struct mpc_group *grp = priv->mpcg;
293d984f 2070
aa3f2cb6
PT		 2071 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2072 __func__, mpcg_state_names[grp->saved_state]);
293d984f
PT		 2073
2074 switch (grp->saved_state) {
2075 /*
2076 * establish conn callback function is
2077 * preferred method to report failure
2078 */
2079 case MPCG_STATE_XID0IOWAIT:
2080 case MPCG_STATE_XID0IOWAIX:
2081 case MPCG_STATE_XID7INITI:
2082 case MPCG_STATE_XID7INITZ:
2083 case MPCG_STATE_XID2INITW:
2084 case MPCG_STATE_XID2INITX:
2085 case MPCG_STATE_XID7INITW:
2086 case MPCG_STATE_XID7INITX:
2087 if (grp->estconnfunc) {
2088 grp->estconnfunc(grp->port_num, -1, 0);
2089 grp->estconnfunc = NULL;
2090 break;
2091 }
2092 case MPCG_STATE_FLOWC:
2093 case MPCG_STATE_READY:
2094 grp->send_qllc_disc = 2;
2095 new_len = sizeof(struct qllc);
2096 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2097 if (qllcptr == NULL) {
aa3f2cb6
PT		 2098 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2099 "%s(%s): qllcptr allocation error",
2100 CTCM_FUNTAIL, dev->name);
2101 return -ENOMEM;
293d984f
PT		 2102 }
2103
2104 qllcptr->qllc_address = 0xcc;
2105 qllcptr->qllc_commands = 0x03;
2106
2107 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2108
2109 if (skb == NULL) {
aa3f2cb6
PT		 2110 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2111 "%s(%s): skb allocation error",
2112 CTCM_FUNTAIL, dev->name);
293d984f 2113 priv->stats.rx_dropped++;
293d984f 2114 kfree(qllcptr);
aa3f2cb6 2115 return -ENOMEM;
293d984f
PT		 2116 }
2117
59ae1d12 2118 skb_put_data(skb, qllcptr, new_len);
293d984f
PT		 2119 kfree(qllcptr);
2120
2121 if (skb_headroom(skb) < 4) {
aa3f2cb6
PT		 2122 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2123 "%s(%s): skb_headroom error",
2124 CTCM_FUNTAIL, dev->name);
293d984f 2125 dev_kfree_skb_any(skb);
aa3f2cb6 2126 return -ENOMEM;
293d984f
PT		 2127 }
2128
3c09e264
UB		 2129 *((__u32 *)skb_push(skb, 4)) =
2130 priv->channel[CTCM_READ]->pdu_seq;
2131 priv->channel[CTCM_READ]->pdu_seq++;
aa3f2cb6 2132 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
3c09e264 2133 __func__, priv->channel[CTCM_READ]->pdu_seq);
293d984f
PT		 2134
2135 /* receipt of CC03 resets anticipated sequence number on
2136 receiving side */
3c09e264 2137 priv->channel[CTCM_READ]->pdu_seq = 0x00;
293d984f
PT		 2138 skb_reset_mac_header(skb);
2139 skb->dev = dev;
2140 skb->protocol = htons(ETH_P_SNAP);
2141 skb->ip_summed = CHECKSUM_UNNECESSARY;
2142
aa3f2cb6 2143 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
293d984f
PT		 2144
2145 netif_rx(skb);
2146 break;
2147 default:
2148 break;
2149
2150 }
2151
aa3f2cb6 2152 return 0;
293d984f
PT		 2153}
2154/* --- This is the END my friend --- */
2155
Linux 6.x block layer and io_uring tree(s)