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> |
47 | #include <linux/bitops.h> |
48 | #include <linux/uaccess.h> |
49 | #include <linux/wait.h> |
50 | #include <linux/moduleparam.h> |
51 | #include <asm/ccwdev.h> |
52 | #include <asm/ccwgroup.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 | *--------------------------------------------------------------------*/ |
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 | scnprintf(addr, sizeof(addr), "%16.16llx" , (__u64)rptr); |
148 | |
149 | scnprintf(boff, sizeof(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 | scnprintf(tbuf, sizeof(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 | scnprintf(tdup, sizeof(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 | scnprintf(tdup, sizeof(tdup), |
201 | "Duplicate as above to %s" , addr); |
202 | ctcm_pr_debug(" --- %s ---\n" , tdup); |
203 | } |
204 | ctcm_pr_debug(" %s (+%s) : %s [%s]\n" , |
205 | addr, boff, bhex, basc); |
206 | } else { |
207 | if (dup >= 1) { |
208 | scnprintf(tdup, sizeof(tdup), |
209 | "Duplicate as above to %s" , addr); |
210 | ctcm_pr_debug(" --- %s ---\n" , tdup); |
211 | } |
212 | if (dup != 0) { |
213 | ctcm_pr_debug(" %s (+%s) : %s [%s]\n" , |
214 | addr, boff, bhex, basc); |
215 | } |
216 | } |
217 | |
218 | return; |
219 | |
220 | } /* end of ctcmpc_dumpit */ |
221 | #endif |
222 | |
223 | #ifdef DEBUGDATA |
224 | /* |
225 | * Dump header and first 16 bytes of an sk_buff for debugging purposes. |
226 | * |
227 | * skb The sk_buff to dump. |
228 | * offset Offset relative to skb-data, where to start the dump. |
229 | */ |
230 | void ctcmpc_dump_skb(struct sk_buff *skb, int offset) |
231 | { |
232 | __u8 *p = skb->data; |
233 | struct th_header *header; |
234 | struct pdu *pheader; |
235 | int bl = skb->len; |
236 | int i; |
237 | |
238 | if (p == NULL) |
239 | return; |
240 | |
241 | p += offset; |
242 | header = (struct th_header *)p; |
243 | |
244 | ctcm_pr_debug("dump:\n" ); |
245 | ctcm_pr_debug("skb len=%d \n" , skb->len); |
246 | if (skb->len > 2) { |
247 | switch (header->th_ch_flag) { |
248 | case TH_HAS_PDU: |
249 | break; |
250 | case 0x00: |
251 | case TH_IS_XID: |
252 | if ((header->th_blk_flag == TH_DATA_IS_XID) && |
253 | (header->th_is_xid == 0x01)) |
254 | goto dumpth; |
255 | case TH_SWEEP_REQ: |
256 | goto dumpth; |
257 | case TH_SWEEP_RESP: |
258 | goto dumpth; |
259 | default: |
260 | break; |
261 | } |
262 | |
263 | pheader = (struct pdu *)p; |
264 | ctcm_pr_debug("pdu->offset: %d hex: %04x\n" , |
265 | pheader->pdu_offset, pheader->pdu_offset); |
266 | ctcm_pr_debug("pdu->flag : %02x\n" , pheader->pdu_flag); |
267 | ctcm_pr_debug("pdu->proto : %02x\n" , pheader->pdu_proto); |
268 | ctcm_pr_debug("pdu->seq : %02x\n" , pheader->pdu_seq); |
269 | goto dumpdata; |
270 | |
271 | dumpth: |
272 | ctcm_pr_debug("th->seg : %02x\n" , header->th_seg); |
273 | ctcm_pr_debug("th->ch : %02x\n" , header->th_ch_flag); |
274 | ctcm_pr_debug("th->blk_flag: %02x\n" , header->th_blk_flag); |
275 | ctcm_pr_debug("th->type : %s\n" , |
276 | (header->th_is_xid) ? "DATA" : "XID" ); |
277 | ctcm_pr_debug("th->seqnum : %04x\n" , header->th_seq_num); |
278 | |
279 | } |
280 | dumpdata: |
281 | if (bl > 32) |
282 | bl = 32; |
283 | ctcm_pr_debug("data: " ); |
284 | for (i = 0; i < bl; i++) |
285 | ctcm_pr_debug("%02x%s" , *p++, (i % 16) ? " " : "\n" ); |
286 | ctcm_pr_debug("\n" ); |
287 | } |
288 | #endif |
289 | |
290 | static struct net_device *ctcmpc_get_dev(int port_num) |
291 | { |
292 | char device[20]; |
293 | struct net_device *dev; |
294 | struct ctcm_priv *priv; |
295 | |
296 | scnprintf(buf: device, size: sizeof(device), fmt: "%s%i" , MPC_DEVICE_NAME, port_num); |
297 | |
298 | dev = __dev_get_by_name(net: &init_net, name: device); |
299 | |
300 | if (dev == NULL) { |
301 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
302 | "%s: Device not found by name: %s" , |
303 | CTCM_FUNTAIL, device); |
304 | return NULL; |
305 | } |
306 | priv = dev->ml_priv; |
307 | if (priv == NULL) { |
308 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
309 | "%s(%s): dev->ml_priv is NULL" , |
310 | CTCM_FUNTAIL, device); |
311 | return NULL; |
312 | } |
313 | if (priv->mpcg == NULL) { |
314 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
315 | "%s(%s): priv->mpcg is NULL" , |
316 | CTCM_FUNTAIL, device); |
317 | return NULL; |
318 | } |
319 | return dev; |
320 | } |
321 | |
322 | /* |
323 | * ctc_mpc_alloc_channel |
324 | * (exported interface) |
325 | * |
326 | * Device Initialization : |
327 | * ACTPATH driven IO operations |
328 | */ |
329 | int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) |
330 | { |
331 | struct net_device *dev; |
332 | struct mpc_group *grp; |
333 | struct ctcm_priv *priv; |
334 | |
335 | dev = ctcmpc_get_dev(port_num); |
336 | if (dev == NULL) |
337 | return 1; |
338 | priv = dev->ml_priv; |
339 | grp = priv->mpcg; |
340 | |
341 | grp->allochanfunc = callback; |
342 | grp->port_num = port_num; |
343 | grp->port_persist = 1; |
344 | |
345 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, |
346 | "%s(%s): state=%s" , |
347 | CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); |
348 | |
349 | switch (fsm_getstate(fi: grp->fsm)) { |
350 | case MPCG_STATE_INOP: |
351 | /* Group is in the process of terminating */ |
352 | grp->alloc_called = 1; |
353 | break; |
354 | case MPCG_STATE_RESET: |
355 | /* MPC Group will transition to state */ |
356 | /* MPCG_STATE_XID2INITW iff the minimum number */ |
357 | /* of 1 read and 1 write channel have successfully*/ |
358 | /* activated */ |
359 | /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ |
360 | if (callback) |
361 | grp->send_qllc_disc = 1; |
362 | fallthrough; |
363 | case MPCG_STATE_XID0IOWAIT: |
364 | fsm_deltimer(timer: &grp->timer); |
365 | grp->outstanding_xid2 = 0; |
366 | grp->outstanding_xid7 = 0; |
367 | grp->outstanding_xid7_p2 = 0; |
368 | grp->saved_xid2 = NULL; |
369 | if (callback) |
370 | ctcm_open(dev); |
371 | fsm_event(fi: priv->fsm, event: DEV_EVENT_START, arg: dev); |
372 | break; |
373 | case MPCG_STATE_READY: |
374 | /* XID exchanges completed after PORT was activated */ |
375 | /* Link station already active */ |
376 | /* Maybe timing issue...retry callback */ |
377 | grp->allocchan_callback_retries++; |
378 | if (grp->allocchan_callback_retries < 4) { |
379 | if (grp->allochanfunc) |
380 | grp->allochanfunc(grp->port_num, |
381 | grp->group_max_buflen); |
382 | } else { |
383 | /* there are problems...bail out */ |
384 | /* there may be a state mismatch so restart */ |
385 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
386 | grp->allocchan_callback_retries = 0; |
387 | } |
388 | break; |
389 | } |
390 | |
391 | return 0; |
392 | } |
393 | EXPORT_SYMBOL(ctc_mpc_alloc_channel); |
394 | |
395 | /* |
396 | * ctc_mpc_establish_connectivity |
397 | * (exported interface) |
398 | */ |
399 | void ctc_mpc_establish_connectivity(int port_num, |
400 | void (*callback)(int, int, int)) |
401 | { |
402 | struct net_device *dev; |
403 | struct mpc_group *grp; |
404 | struct ctcm_priv *priv; |
405 | struct channel *rch, *wch; |
406 | |
407 | dev = ctcmpc_get_dev(port_num); |
408 | if (dev == NULL) |
409 | return; |
410 | priv = dev->ml_priv; |
411 | grp = priv->mpcg; |
412 | rch = priv->channel[CTCM_READ]; |
413 | wch = priv->channel[CTCM_WRITE]; |
414 | |
415 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, |
416 | "%s(%s): state=%s" , |
417 | CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); |
418 | |
419 | grp->estconnfunc = callback; |
420 | grp->port_num = port_num; |
421 | |
422 | switch (fsm_getstate(fi: grp->fsm)) { |
423 | case MPCG_STATE_READY: |
424 | /* XID exchanges completed after PORT was activated */ |
425 | /* Link station already active */ |
426 | /* Maybe timing issue...retry callback */ |
427 | fsm_deltimer(timer: &grp->timer); |
428 | grp->estconn_callback_retries++; |
429 | if (grp->estconn_callback_retries < 4) { |
430 | if (grp->estconnfunc) { |
431 | grp->estconnfunc(grp->port_num, 0, |
432 | grp->group_max_buflen); |
433 | grp->estconnfunc = NULL; |
434 | } |
435 | } else { |
436 | /* there are problems...bail out */ |
437 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
438 | grp->estconn_callback_retries = 0; |
439 | } |
440 | break; |
441 | case MPCG_STATE_INOP: |
442 | case MPCG_STATE_RESET: |
443 | /* MPC Group is not ready to start XID - min num of */ |
444 | /* 1 read and 1 write channel have not been acquired*/ |
445 | |
446 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
447 | "%s(%s): REJECTED - inactive channels" , |
448 | CTCM_FUNTAIL, dev->name); |
449 | if (grp->estconnfunc) { |
450 | grp->estconnfunc(grp->port_num, -1, 0); |
451 | grp->estconnfunc = NULL; |
452 | } |
453 | break; |
454 | case MPCG_STATE_XID2INITW: |
455 | /* alloc channel was called but no XID exchange */ |
456 | /* has occurred. initiate xside XID exchange */ |
457 | /* make sure yside XID0 processing has not started */ |
458 | |
459 | if ((fsm_getstate(fi: rch->fsm) > CH_XID0_PENDING) || |
460 | (fsm_getstate(fi: wch->fsm) > CH_XID0_PENDING)) { |
461 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
462 | "%s(%s): ABORT - PASSIVE XID" , |
463 | CTCM_FUNTAIL, dev->name); |
464 | break; |
465 | } |
466 | grp->send_qllc_disc = 1; |
467 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID0IOWAIT); |
468 | fsm_deltimer(timer: &grp->timer); |
469 | fsm_addtimer(timer: &grp->timer, MPC_XID_TIMEOUT_VALUE, |
470 | event: MPCG_EVENT_TIMER, arg: dev); |
471 | grp->outstanding_xid7 = 0; |
472 | grp->outstanding_xid7_p2 = 0; |
473 | grp->saved_xid2 = NULL; |
474 | if ((rch->in_mpcgroup) && |
475 | (fsm_getstate(fi: rch->fsm) == CH_XID0_PENDING)) |
476 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID0DO, arg: rch); |
477 | else { |
478 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
479 | "%s(%s): RX-%s not ready for ACTIVE XID0" , |
480 | CTCM_FUNTAIL, dev->name, rch->id); |
481 | if (grp->estconnfunc) { |
482 | grp->estconnfunc(grp->port_num, -1, 0); |
483 | grp->estconnfunc = NULL; |
484 | } |
485 | fsm_deltimer(timer: &grp->timer); |
486 | goto done; |
487 | } |
488 | if ((wch->in_mpcgroup) && |
489 | (fsm_getstate(fi: wch->fsm) == CH_XID0_PENDING)) |
490 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID0DO, arg: wch); |
491 | else { |
492 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
493 | "%s(%s): WX-%s not ready for ACTIVE XID0" , |
494 | CTCM_FUNTAIL, dev->name, wch->id); |
495 | if (grp->estconnfunc) { |
496 | grp->estconnfunc(grp->port_num, -1, 0); |
497 | grp->estconnfunc = NULL; |
498 | } |
499 | fsm_deltimer(timer: &grp->timer); |
500 | goto done; |
501 | } |
502 | break; |
503 | case MPCG_STATE_XID0IOWAIT: |
504 | /* already in active XID negotiations */ |
505 | default: |
506 | break; |
507 | } |
508 | |
509 | done: |
510 | CTCM_PR_DEBUG("Exit %s()\n" , __func__); |
511 | return; |
512 | } |
513 | EXPORT_SYMBOL(ctc_mpc_establish_connectivity); |
514 | |
515 | /* |
516 | * ctc_mpc_dealloc_ch |
517 | * (exported interface) |
518 | */ |
519 | void ctc_mpc_dealloc_ch(int port_num) |
520 | { |
521 | struct net_device *dev; |
522 | struct ctcm_priv *priv; |
523 | struct mpc_group *grp; |
524 | |
525 | dev = ctcmpc_get_dev(port_num); |
526 | if (dev == NULL) |
527 | return; |
528 | priv = dev->ml_priv; |
529 | grp = priv->mpcg; |
530 | |
531 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, |
532 | "%s: %s: refcount = %d\n" , |
533 | CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); |
534 | |
535 | fsm_deltimer(timer: &priv->restart_timer); |
536 | grp->channels_terminating = 0; |
537 | fsm_deltimer(timer: &grp->timer); |
538 | grp->allochanfunc = NULL; |
539 | grp->estconnfunc = NULL; |
540 | grp->port_persist = 0; |
541 | grp->send_qllc_disc = 0; |
542 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
543 | |
544 | ctcm_close(dev); |
545 | return; |
546 | } |
547 | EXPORT_SYMBOL(ctc_mpc_dealloc_ch); |
548 | |
549 | /* |
550 | * ctc_mpc_flow_control |
551 | * (exported interface) |
552 | */ |
553 | void ctc_mpc_flow_control(int port_num, int flowc) |
554 | { |
555 | struct ctcm_priv *priv; |
556 | struct mpc_group *grp; |
557 | struct net_device *dev; |
558 | struct channel *rch; |
559 | int mpcg_state; |
560 | |
561 | dev = ctcmpc_get_dev(port_num); |
562 | if (dev == NULL) |
563 | return; |
564 | priv = dev->ml_priv; |
565 | grp = priv->mpcg; |
566 | |
567 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, |
568 | "%s: %s: flowc = %d" , |
569 | CTCM_FUNTAIL, dev->name, flowc); |
570 | |
571 | rch = priv->channel[CTCM_READ]; |
572 | |
573 | mpcg_state = fsm_getstate(fi: grp->fsm); |
574 | switch (flowc) { |
575 | case 1: |
576 | if (mpcg_state == MPCG_STATE_FLOWC) |
577 | break; |
578 | if (mpcg_state == MPCG_STATE_READY) { |
579 | if (grp->flow_off_called == 1) |
580 | grp->flow_off_called = 0; |
581 | else |
582 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_FLOWC); |
583 | break; |
584 | } |
585 | break; |
586 | case 0: |
587 | if (mpcg_state == MPCG_STATE_FLOWC) { |
588 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_READY); |
589 | /* ensure any data that has accumulated */ |
590 | /* on the io_queue will now be sen t */ |
591 | tasklet_schedule(t: &rch->ch_tasklet); |
592 | } |
593 | /* possible race condition */ |
594 | if (mpcg_state == MPCG_STATE_READY) { |
595 | grp->flow_off_called = 1; |
596 | break; |
597 | } |
598 | break; |
599 | } |
600 | |
601 | } |
602 | EXPORT_SYMBOL(ctc_mpc_flow_control); |
603 | |
604 | static int mpc_send_qllc_discontact(struct net_device *); |
605 | |
606 | /* |
607 | * helper function of ctcmpc_unpack_skb |
608 | */ |
609 | static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) |
610 | { |
611 | struct channel *rch = mpcginfo->ch; |
612 | struct net_device *dev = rch->netdev; |
613 | struct ctcm_priv *priv = dev->ml_priv; |
614 | struct mpc_group *grp = priv->mpcg; |
615 | struct channel *ch = priv->channel[CTCM_WRITE]; |
616 | |
617 | CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n" , __func__, ch, ch->id); |
618 | CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); |
619 | |
620 | grp->sweep_rsp_pend_num--; |
621 | |
622 | if ((grp->sweep_req_pend_num == 0) && |
623 | (grp->sweep_rsp_pend_num == 0)) { |
624 | fsm_deltimer(timer: &ch->sweep_timer); |
625 | grp->in_sweep = 0; |
626 | rch->th_seq_num = 0x00; |
627 | ch->th_seq_num = 0x00; |
628 | ctcm_clear_busy_do(dev); |
629 | } |
630 | |
631 | return; |
632 | |
633 | } |
634 | |
635 | /* |
636 | * helper function of mpc_rcvd_sweep_req |
637 | * which is a helper of ctcmpc_unpack_skb |
638 | */ |
639 | static void ctcmpc_send_sweep_resp(struct channel *rch) |
640 | { |
641 | struct net_device *dev = rch->netdev; |
642 | struct ctcm_priv *priv = dev->ml_priv; |
643 | struct mpc_group *grp = priv->mpcg; |
644 | struct th_sweep *; |
645 | struct sk_buff *sweep_skb; |
646 | struct channel *ch = priv->channel[CTCM_WRITE]; |
647 | |
648 | CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n" , __func__, rch, rch->id); |
649 | |
650 | sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); |
651 | if (sweep_skb == NULL) { |
652 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
653 | "%s(%s): sweep_skb allocation ERROR\n" , |
654 | CTCM_FUNTAIL, rch->id); |
655 | goto done; |
656 | } |
657 | |
658 | header = skb_put_zero(skb: sweep_skb, TH_SWEEP_LENGTH); |
659 | header->th.th_ch_flag = TH_SWEEP_RESP; |
660 | header->sw.th_last_seq = ch->th_seq_num; |
661 | |
662 | netif_trans_update(dev); |
663 | skb_queue_tail(list: &ch->sweep_queue, newsk: sweep_skb); |
664 | |
665 | fsm_addtimer(timer: &ch->sweep_timer, millisec: 100, event: CTC_EVENT_RSWEEP_TIMER, arg: ch); |
666 | |
667 | return; |
668 | |
669 | done: |
670 | grp->in_sweep = 0; |
671 | ctcm_clear_busy_do(dev); |
672 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
673 | |
674 | return; |
675 | } |
676 | |
677 | /* |
678 | * helper function of ctcmpc_unpack_skb |
679 | */ |
680 | static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) |
681 | { |
682 | struct channel *rch = mpcginfo->ch; |
683 | struct net_device *dev = rch->netdev; |
684 | struct ctcm_priv *priv = dev->ml_priv; |
685 | struct mpc_group *grp = priv->mpcg; |
686 | struct channel *ch = priv->channel[CTCM_WRITE]; |
687 | |
688 | if (do_debug) |
689 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, |
690 | " %s(): ch=0x%p id=%s\n" , __func__, ch, ch->id); |
691 | |
692 | if (grp->in_sweep == 0) { |
693 | grp->in_sweep = 1; |
694 | ctcm_test_and_set_busy(dev); |
695 | grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; |
696 | grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; |
697 | } |
698 | |
699 | CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); |
700 | |
701 | grp->sweep_req_pend_num--; |
702 | ctcmpc_send_sweep_resp(rch: ch); |
703 | kfree(objp: mpcginfo); |
704 | return; |
705 | } |
706 | |
707 | /* |
708 | * MPC Group Station FSM definitions |
709 | */ |
710 | static const char *mpcg_event_names[] = { |
711 | [MPCG_EVENT_INOP] = "INOP Condition" , |
712 | [MPCG_EVENT_DISCONC] = "Discontact Received" , |
713 | [MPCG_EVENT_XID0DO] = "Channel Active - Start XID" , |
714 | [MPCG_EVENT_XID2] = "XID2 Received" , |
715 | [MPCG_EVENT_XID2DONE] = "XID0 Complete" , |
716 | [MPCG_EVENT_XID7DONE] = "XID7 Complete" , |
717 | [MPCG_EVENT_TIMER] = "XID Setup Timer" , |
718 | [MPCG_EVENT_DOIO] = "XID DoIO" , |
719 | }; |
720 | |
721 | static const char *mpcg_state_names[] = { |
722 | [MPCG_STATE_RESET] = "Reset" , |
723 | [MPCG_STATE_INOP] = "INOP" , |
724 | [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start" , |
725 | [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete" , |
726 | [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start" , |
727 | [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete" , |
728 | [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start" , |
729 | [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete" , |
730 | [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start" , |
731 | [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete " , |
732 | [MPCG_STATE_XID7INITF] = "XID - XID7 Complete " , |
733 | [MPCG_STATE_FLOWC] = "FLOW CONTROL ON" , |
734 | [MPCG_STATE_READY] = "READY" , |
735 | }; |
736 | |
737 | /* |
738 | * The MPC Group Station FSM |
739 | * 22 events |
740 | */ |
741 | static const fsm_node mpcg_fsm[] = { |
742 | { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, |
743 | { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, |
744 | { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, |
745 | |
746 | { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
747 | { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, |
748 | |
749 | { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, |
750 | { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, |
751 | { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, |
752 | { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, |
753 | { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, |
754 | |
755 | { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, |
756 | { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, |
757 | { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, |
758 | { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, |
759 | { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, |
760 | |
761 | { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, |
762 | { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
763 | { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, |
764 | { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, |
765 | { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, |
766 | { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, |
767 | { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, |
768 | |
769 | { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
770 | { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, |
771 | { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, |
772 | { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, |
773 | { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, |
774 | { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, |
775 | |
776 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, |
777 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
778 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, |
779 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, |
780 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, |
781 | { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, |
782 | |
783 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, |
784 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
785 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, |
786 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, |
787 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, |
788 | { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, |
789 | |
790 | { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, |
791 | { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, |
792 | { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
793 | { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, |
794 | { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, |
795 | { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, |
796 | { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, |
797 | |
798 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, |
799 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, |
800 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, |
801 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, |
802 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, |
803 | { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, |
804 | |
805 | { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, |
806 | { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, |
807 | }; |
808 | |
809 | static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); |
810 | |
811 | /* |
812 | * MPC Group Station FSM action |
813 | * CTCM_PROTO_MPC only |
814 | */ |
815 | static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) |
816 | { |
817 | struct net_device *dev = arg; |
818 | struct ctcm_priv *priv = dev->ml_priv; |
819 | struct mpc_group *grp = priv->mpcg; |
820 | |
821 | if (grp == NULL) { |
822 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
823 | "%s(%s): No MPC group" , |
824 | CTCM_FUNTAIL, dev->name); |
825 | return; |
826 | } |
827 | |
828 | fsm_deltimer(timer: &grp->timer); |
829 | |
830 | if (grp->saved_xid2->xid2_flag2 == 0x40) { |
831 | priv->xid->xid2_flag2 = 0x00; |
832 | if (grp->estconnfunc) { |
833 | grp->estconnfunc(grp->port_num, 1, |
834 | grp->group_max_buflen); |
835 | grp->estconnfunc = NULL; |
836 | } else if (grp->allochanfunc) |
837 | grp->send_qllc_disc = 1; |
838 | |
839 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
840 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
841 | "%s(%s): fails" , |
842 | CTCM_FUNTAIL, dev->name); |
843 | return; |
844 | } |
845 | |
846 | grp->port_persist = 1; |
847 | grp->out_of_sequence = 0; |
848 | grp->estconn_called = 0; |
849 | |
850 | tasklet_hi_schedule(t: &grp->mpc_tasklet2); |
851 | |
852 | return; |
853 | } |
854 | |
855 | /* |
856 | * helper of ctcm_init_netdevice |
857 | * CTCM_PROTO_MPC only |
858 | */ |
859 | void mpc_group_ready(unsigned long adev) |
860 | { |
861 | struct net_device *dev = (struct net_device *)adev; |
862 | struct ctcm_priv *priv = dev->ml_priv; |
863 | struct mpc_group *grp = priv->mpcg; |
864 | struct channel *ch = NULL; |
865 | |
866 | if (grp == NULL) { |
867 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
868 | "%s(%s): No MPC group" , |
869 | CTCM_FUNTAIL, dev->name); |
870 | return; |
871 | } |
872 | |
873 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, |
874 | "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n" , |
875 | CTCM_FUNTAIL, dev->name, grp->group_max_buflen); |
876 | |
877 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_READY); |
878 | |
879 | /* Put up a read on the channel */ |
880 | ch = priv->channel[CTCM_READ]; |
881 | ch->pdu_seq = 0; |
882 | CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , |
883 | __func__, ch->pdu_seq); |
884 | |
885 | ctcmpc_chx_rxidle(fi: ch->fsm, event: CTC_EVENT_START, arg: ch); |
886 | /* Put the write channel in idle state */ |
887 | ch = priv->channel[CTCM_WRITE]; |
888 | if (ch->collect_len > 0) { |
889 | spin_lock(lock: &ch->collect_lock); |
890 | ctcm_purge_skb_queue(q: &ch->collect_queue); |
891 | ch->collect_len = 0; |
892 | spin_unlock(lock: &ch->collect_lock); |
893 | } |
894 | ctcm_chx_txidle(fi: ch->fsm, event: CTC_EVENT_START, arg: ch); |
895 | ctcm_clear_busy(dev); |
896 | |
897 | if (grp->estconnfunc) { |
898 | grp->estconnfunc(grp->port_num, 0, |
899 | grp->group_max_buflen); |
900 | grp->estconnfunc = NULL; |
901 | } else if (grp->allochanfunc) { |
902 | grp->allochanfunc(grp->port_num, grp->group_max_buflen); |
903 | } |
904 | |
905 | grp->send_qllc_disc = 1; |
906 | grp->changed_side = 0; |
907 | |
908 | return; |
909 | |
910 | } |
911 | |
912 | /* |
913 | * Increment the MPC Group Active Channel Counts |
914 | * helper of dev_action (called from channel fsm) |
915 | */ |
916 | void mpc_channel_action(struct channel *ch, int direction, int action) |
917 | { |
918 | struct net_device *dev = ch->netdev; |
919 | struct ctcm_priv *priv = dev->ml_priv; |
920 | struct mpc_group *grp = priv->mpcg; |
921 | |
922 | if (grp == NULL) { |
923 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
924 | "%s(%s): No MPC group" , |
925 | CTCM_FUNTAIL, dev->name); |
926 | return; |
927 | } |
928 | |
929 | CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n" , __func__, ch, ch->id); |
930 | |
931 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, |
932 | "%s: %i / Grp:%s total_channels=%i, active_channels: " |
933 | "read=%i, write=%i\n" , __func__, action, |
934 | fsm_getstate_str(grp->fsm), grp->num_channel_paths, |
935 | grp->active_channels[CTCM_READ], |
936 | grp->active_channels[CTCM_WRITE]); |
937 | |
938 | if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { |
939 | grp->num_channel_paths++; |
940 | grp->active_channels[direction]++; |
941 | grp->outstanding_xid2++; |
942 | ch->in_mpcgroup = 1; |
943 | |
944 | if (ch->xid_skb != NULL) |
945 | dev_kfree_skb_any(skb: ch->xid_skb); |
946 | |
947 | ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, |
948 | GFP_ATOMIC | GFP_DMA); |
949 | if (ch->xid_skb == NULL) { |
950 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
951 | "%s(%s): Couldn't alloc ch xid_skb\n" , |
952 | CTCM_FUNTAIL, dev->name); |
953 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
954 | return; |
955 | } |
956 | ch->xid_skb_data = ch->xid_skb->data; |
957 | ch->xid_th = (struct th_header *)ch->xid_skb->data; |
958 | skb_put(skb: ch->xid_skb, TH_HEADER_LENGTH); |
959 | ch->xid = (struct xid2 *)skb_tail_pointer(skb: ch->xid_skb); |
960 | skb_put(skb: ch->xid_skb, XID2_LENGTH); |
961 | ch->xid_id = skb_tail_pointer(skb: ch->xid_skb); |
962 | ch->xid_skb->data = ch->xid_skb_data; |
963 | skb_reset_tail_pointer(skb: ch->xid_skb); |
964 | ch->xid_skb->len = 0; |
965 | |
966 | skb_put_data(skb: ch->xid_skb, data: grp->xid_skb->data, |
967 | len: grp->xid_skb->len); |
968 | |
969 | ch->xid->xid2_dlc_type = |
970 | ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) |
971 | ? XID2_READ_SIDE : XID2_WRITE_SIDE); |
972 | |
973 | if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) |
974 | ch->xid->xid2_buf_len = 0x00; |
975 | |
976 | ch->xid_skb->data = ch->xid_skb_data; |
977 | skb_reset_tail_pointer(skb: ch->xid_skb); |
978 | ch->xid_skb->len = 0; |
979 | |
980 | fsm_newstate(fi: ch->fsm, newstate: CH_XID0_PENDING); |
981 | |
982 | if ((grp->active_channels[CTCM_READ] > 0) && |
983 | (grp->active_channels[CTCM_WRITE] > 0) && |
984 | (fsm_getstate(fi: grp->fsm) < MPCG_STATE_XID2INITW)) { |
985 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID2INITW); |
986 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, |
987 | "%s: %s: MPC GROUP CHANNELS ACTIVE\n" , |
988 | __func__, dev->name); |
989 | } |
990 | } else if ((action == MPC_CHANNEL_REMOVE) && |
991 | (ch->in_mpcgroup == 1)) { |
992 | ch->in_mpcgroup = 0; |
993 | grp->num_channel_paths--; |
994 | grp->active_channels[direction]--; |
995 | |
996 | if (ch->xid_skb != NULL) |
997 | dev_kfree_skb_any(skb: ch->xid_skb); |
998 | ch->xid_skb = NULL; |
999 | |
1000 | if (grp->channels_terminating) |
1001 | goto done; |
1002 | |
1003 | if (((grp->active_channels[CTCM_READ] == 0) && |
1004 | (grp->active_channels[CTCM_WRITE] > 0)) |
1005 | || ((grp->active_channels[CTCM_WRITE] == 0) && |
1006 | (grp->active_channels[CTCM_READ] > 0))) |
1007 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1008 | } |
1009 | done: |
1010 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, |
1011 | "exit %s: %i / Grp:%s total_channels=%i, active_channels: " |
1012 | "read=%i, write=%i\n" , __func__, action, |
1013 | fsm_getstate_str(grp->fsm), grp->num_channel_paths, |
1014 | grp->active_channels[CTCM_READ], |
1015 | grp->active_channels[CTCM_WRITE]); |
1016 | |
1017 | CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n" , __func__, ch, ch->id); |
1018 | } |
1019 | |
1020 | /* |
1021 | * Unpack a just received skb and hand it over to |
1022 | * upper layers. |
1023 | * special MPC version of unpack_skb. |
1024 | * |
1025 | * ch The channel where this skb has been received. |
1026 | * pskb The received skb. |
1027 | */ |
1028 | static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) |
1029 | { |
1030 | struct net_device *dev = ch->netdev; |
1031 | struct ctcm_priv *priv = dev->ml_priv; |
1032 | struct mpc_group *grp = priv->mpcg; |
1033 | struct pdu *curr_pdu; |
1034 | struct mpcg_info *mpcginfo; |
1035 | struct th_header * = NULL; |
1036 | struct th_sweep *sweep = NULL; |
1037 | int pdu_last_seen = 0; |
1038 | __u32 new_len; |
1039 | struct sk_buff *skb; |
1040 | int skblen; |
1041 | int sendrc = 0; |
1042 | |
1043 | CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n" , |
1044 | __func__, dev->name, smp_processor_id(), ch->id); |
1045 | |
1046 | header = (struct th_header *)pskb->data; |
1047 | if ((header->th_seg == 0) && |
1048 | (header->th_ch_flag == 0) && |
1049 | (header->th_blk_flag == 0) && |
1050 | (header->th_seq_num == 0)) |
1051 | /* nothing for us */ goto done; |
1052 | |
1053 | CTCM_PR_DBGDATA("%s: th_header\n" , __func__); |
1054 | CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); |
1055 | CTCM_PR_DBGDATA("%s: pskb len: %04x \n" , __func__, pskb->len); |
1056 | |
1057 | pskb->dev = dev; |
1058 | pskb->ip_summed = CHECKSUM_UNNECESSARY; |
1059 | skb_pull(skb: pskb, TH_HEADER_LENGTH); |
1060 | |
1061 | if (likely(header->th_ch_flag == TH_HAS_PDU)) { |
1062 | CTCM_PR_DBGDATA("%s: came into th_has_pdu\n" , __func__); |
1063 | if ((fsm_getstate(fi: grp->fsm) == MPCG_STATE_FLOWC) || |
1064 | ((fsm_getstate(fi: grp->fsm) == MPCG_STATE_READY) && |
1065 | (header->th_seq_num != ch->th_seq_num + 1) && |
1066 | (ch->th_seq_num != 0))) { |
1067 | /* This is NOT the next segment * |
1068 | * we are not the correct race winner * |
1069 | * go away and let someone else win * |
1070 | * BUT..this only applies if xid negot * |
1071 | * is done * |
1072 | */ |
1073 | grp->out_of_sequence += 1; |
1074 | __skb_push(skb: pskb, TH_HEADER_LENGTH); |
1075 | skb_queue_tail(list: &ch->io_queue, newsk: pskb); |
1076 | CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " |
1077 | "got:%08x\n" , __func__, |
1078 | ch->th_seq_num + 1, header->th_seq_num); |
1079 | |
1080 | return; |
1081 | } |
1082 | grp->out_of_sequence = 0; |
1083 | ch->th_seq_num = header->th_seq_num; |
1084 | |
1085 | CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n" , |
1086 | __func__, ch->th_seq_num); |
1087 | |
1088 | if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) |
1089 | goto done; |
1090 | while ((pskb->len > 0) && !pdu_last_seen) { |
1091 | curr_pdu = (struct pdu *)pskb->data; |
1092 | |
1093 | CTCM_PR_DBGDATA("%s: pdu_header\n" , __func__); |
1094 | CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); |
1095 | CTCM_PR_DBGDATA("%s: pskb len: %04x \n" , |
1096 | __func__, pskb->len); |
1097 | |
1098 | skb_pull(skb: pskb, PDU_HEADER_LENGTH); |
1099 | |
1100 | if (curr_pdu->pdu_flag & PDU_LAST) |
1101 | pdu_last_seen = 1; |
1102 | if (curr_pdu->pdu_flag & PDU_CNTL) |
1103 | pskb->protocol = htons(ETH_P_SNAP); |
1104 | else |
1105 | pskb->protocol = htons(ETH_P_SNA_DIX); |
1106 | |
1107 | if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { |
1108 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1109 | "%s(%s): Dropping packet with " |
1110 | "illegal siize %d" , |
1111 | CTCM_FUNTAIL, dev->name, pskb->len); |
1112 | |
1113 | priv->stats.rx_dropped++; |
1114 | priv->stats.rx_length_errors++; |
1115 | goto done; |
1116 | } |
1117 | skb_reset_mac_header(skb: pskb); |
1118 | new_len = curr_pdu->pdu_offset; |
1119 | CTCM_PR_DBGDATA("%s: new_len: %04x \n" , |
1120 | __func__, new_len); |
1121 | if ((new_len == 0) || (new_len > pskb->len)) { |
1122 | /* should never happen */ |
1123 | /* pskb len must be hosed...bail out */ |
1124 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1125 | "%s(%s): non valid pdu_offset: %04x" , |
1126 | /* "data may be lost", */ |
1127 | CTCM_FUNTAIL, dev->name, new_len); |
1128 | goto done; |
1129 | } |
1130 | skb = __dev_alloc_skb(length: new_len+4, GFP_ATOMIC); |
1131 | |
1132 | if (!skb) { |
1133 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1134 | "%s(%s): MEMORY allocation error" , |
1135 | CTCM_FUNTAIL, dev->name); |
1136 | priv->stats.rx_dropped++; |
1137 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1138 | goto done; |
1139 | } |
1140 | skb_put_data(skb, data: pskb->data, len: new_len); |
1141 | |
1142 | skb_reset_mac_header(skb); |
1143 | skb->dev = pskb->dev; |
1144 | skb->protocol = pskb->protocol; |
1145 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1146 | *((__u32 *) skb_push(skb, len: 4)) = ch->pdu_seq; |
1147 | ch->pdu_seq++; |
1148 | |
1149 | if (do_debug_data) { |
1150 | ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n" , |
1151 | __func__, ch->pdu_seq); |
1152 | ctcm_pr_debug("%s: skb:%0lx " |
1153 | "skb len: %d \n" , __func__, |
1154 | (unsigned long)skb, skb->len); |
1155 | ctcm_pr_debug("%s: up to 32 bytes " |
1156 | "of pdu_data sent\n" , __func__); |
1157 | ctcmpc_dump32(buf: (char *)skb->data, len: skb->len); |
1158 | } |
1159 | |
1160 | skblen = skb->len; |
1161 | sendrc = netif_rx(skb); |
1162 | priv->stats.rx_packets++; |
1163 | priv->stats.rx_bytes += skblen; |
1164 | skb_pull(skb: pskb, len: new_len); /* point to next PDU */ |
1165 | } |
1166 | } else { |
1167 | mpcginfo = kmalloc(size: sizeof(struct mpcg_info), GFP_ATOMIC); |
1168 | if (mpcginfo == NULL) |
1169 | goto done; |
1170 | |
1171 | mpcginfo->ch = ch; |
1172 | mpcginfo->th = header; |
1173 | mpcginfo->skb = pskb; |
1174 | CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n" , |
1175 | __func__); |
1176 | /* it's a sweep? */ |
1177 | sweep = (struct th_sweep *)pskb->data; |
1178 | mpcginfo->sweep = sweep; |
1179 | if (header->th_ch_flag == TH_SWEEP_REQ) |
1180 | mpc_rcvd_sweep_req(mpcginfo); |
1181 | else if (header->th_ch_flag == TH_SWEEP_RESP) |
1182 | mpc_rcvd_sweep_resp(mpcginfo); |
1183 | else if (header->th_blk_flag == TH_DATA_IS_XID) { |
1184 | struct xid2 *thisxid = (struct xid2 *)pskb->data; |
1185 | skb_pull(skb: pskb, XID2_LENGTH); |
1186 | mpcginfo->xid = thisxid; |
1187 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID2, arg: mpcginfo); |
1188 | } else if (header->th_blk_flag == TH_DISCONTACT) |
1189 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_DISCONC, arg: mpcginfo); |
1190 | else if (header->th_seq_num != 0) { |
1191 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1192 | "%s(%s): control pkt expected\n" , |
1193 | CTCM_FUNTAIL, dev->name); |
1194 | priv->stats.rx_dropped++; |
1195 | /* mpcginfo only used for non-data transfers */ |
1196 | if (do_debug_data) |
1197 | ctcmpc_dump_skb(skb: pskb, offset: -8); |
1198 | } |
1199 | kfree(objp: mpcginfo); |
1200 | } |
1201 | done: |
1202 | |
1203 | dev_kfree_skb_any(skb: pskb); |
1204 | if (sendrc == NET_RX_DROP) { |
1205 | dev_warn(&dev->dev, |
1206 | "The network backlog for %s is exceeded, " |
1207 | "package dropped\n" , __func__); |
1208 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1209 | } |
1210 | |
1211 | CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n" , |
1212 | __func__, dev->name, ch, ch->id); |
1213 | } |
1214 | |
1215 | /* |
1216 | * tasklet helper for mpc's skb unpacking. |
1217 | * |
1218 | * ch The channel to work on. |
1219 | * Allow flow control back pressure to occur here. |
1220 | * Throttling back channel can result in excessive |
1221 | * channel inactivity and system deact of channel |
1222 | */ |
1223 | void ctcmpc_bh(unsigned long thischan) |
1224 | { |
1225 | struct channel *ch = (struct channel *)thischan; |
1226 | struct sk_buff *skb; |
1227 | struct net_device *dev = ch->netdev; |
1228 | struct ctcm_priv *priv = dev->ml_priv; |
1229 | struct mpc_group *grp = priv->mpcg; |
1230 | |
1231 | CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n" , |
1232 | dev->name, smp_processor_id(), __func__, ch->id); |
1233 | /* caller has requested driver to throttle back */ |
1234 | while ((fsm_getstate(fi: grp->fsm) != MPCG_STATE_FLOWC) && |
1235 | (skb = skb_dequeue(list: &ch->io_queue))) { |
1236 | ctcmpc_unpack_skb(ch, pskb: skb); |
1237 | if (grp->out_of_sequence > 20) { |
1238 | /* assume data loss has occurred if */ |
1239 | /* missing seq_num for extended */ |
1240 | /* period of time */ |
1241 | grp->out_of_sequence = 0; |
1242 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1243 | break; |
1244 | } |
1245 | if (skb == skb_peek(list_: &ch->io_queue)) |
1246 | break; |
1247 | } |
1248 | CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n" , |
1249 | __func__, dev->name, ch, ch->id); |
1250 | return; |
1251 | } |
1252 | |
1253 | /* |
1254 | * MPC Group Initializations |
1255 | */ |
1256 | struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) |
1257 | { |
1258 | struct mpc_group *grp; |
1259 | |
1260 | CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, |
1261 | "Enter %s(%p)" , CTCM_FUNTAIL, priv); |
1262 | |
1263 | grp = kzalloc(size: sizeof(struct mpc_group), GFP_KERNEL); |
1264 | if (grp == NULL) |
1265 | return NULL; |
1266 | |
1267 | grp->fsm = init_fsm(name: "mpcg" , state_names: mpcg_state_names, event_names: mpcg_event_names, |
1268 | nr_states: MPCG_NR_STATES, nr_events: MPCG_NR_EVENTS, tmpl: mpcg_fsm, |
1269 | tmpl_len: mpcg_fsm_len, GFP_KERNEL); |
1270 | if (grp->fsm == NULL) { |
1271 | kfree(objp: grp); |
1272 | return NULL; |
1273 | } |
1274 | |
1275 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_RESET); |
1276 | fsm_settimer(fi: grp->fsm, &grp->timer); |
1277 | |
1278 | grp->xid_skb = |
1279 | __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); |
1280 | if (grp->xid_skb == NULL) { |
1281 | kfree_fsm(fi: grp->fsm); |
1282 | kfree(objp: grp); |
1283 | return NULL; |
1284 | } |
1285 | /* base xid for all channels in group */ |
1286 | grp->xid_skb_data = grp->xid_skb->data; |
1287 | grp->xid_th = (struct th_header *)grp->xid_skb->data; |
1288 | skb_put_data(skb: grp->xid_skb, data: &thnorm, TH_HEADER_LENGTH); |
1289 | |
1290 | grp->xid = (struct xid2 *)skb_tail_pointer(skb: grp->xid_skb); |
1291 | skb_put_data(skb: grp->xid_skb, data: &init_xid, XID2_LENGTH); |
1292 | grp->xid->xid2_adj_id = jiffies | 0xfff00000; |
1293 | grp->xid->xid2_sender_id = jiffies; |
1294 | |
1295 | grp->xid_id = skb_tail_pointer(skb: grp->xid_skb); |
1296 | skb_put_data(skb: grp->xid_skb, data: "VTAM" , len: 4); |
1297 | |
1298 | grp->rcvd_xid_skb = |
1299 | __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); |
1300 | if (grp->rcvd_xid_skb == NULL) { |
1301 | kfree_fsm(fi: grp->fsm); |
1302 | dev_kfree_skb(grp->xid_skb); |
1303 | kfree(objp: grp); |
1304 | return NULL; |
1305 | } |
1306 | grp->rcvd_xid_data = grp->rcvd_xid_skb->data; |
1307 | grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; |
1308 | skb_put_data(skb: grp->rcvd_xid_skb, data: &thnorm, TH_HEADER_LENGTH); |
1309 | grp->saved_xid2 = NULL; |
1310 | priv->xid = grp->xid; |
1311 | priv->mpcg = grp; |
1312 | return grp; |
1313 | } |
1314 | |
1315 | /* |
1316 | * The MPC Group Station FSM |
1317 | */ |
1318 | |
1319 | /* |
1320 | * MPC Group Station FSM actions |
1321 | * CTCM_PROTO_MPC only |
1322 | */ |
1323 | |
1324 | /* |
1325 | * NOP action for statemachines |
1326 | */ |
1327 | static void mpc_action_nop(fsm_instance *fi, int event, void *arg) |
1328 | { |
1329 | } |
1330 | |
1331 | /* |
1332 | * invoked when the device transitions to dev_stopped |
1333 | * MPC will stop each individual channel if a single XID failure |
1334 | * occurs, or will intitiate all channels be stopped if a GROUP |
1335 | * level failure occurs. |
1336 | */ |
1337 | static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) |
1338 | { |
1339 | struct net_device *dev = arg; |
1340 | struct ctcm_priv *priv; |
1341 | struct mpc_group *grp; |
1342 | struct channel *wch; |
1343 | |
1344 | CTCM_PR_DEBUG("Enter %s: %s\n" , __func__, dev->name); |
1345 | |
1346 | priv = dev->ml_priv; |
1347 | grp = priv->mpcg; |
1348 | grp->flow_off_called = 0; |
1349 | fsm_deltimer(timer: &grp->timer); |
1350 | if (grp->channels_terminating) |
1351 | return; |
1352 | |
1353 | grp->channels_terminating = 1; |
1354 | grp->saved_state = fsm_getstate(fi: grp->fsm); |
1355 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_INOP); |
1356 | if (grp->saved_state > MPCG_STATE_XID7INITF) |
1357 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, |
1358 | "%s(%s): MPC GROUP INOPERATIVE" , |
1359 | CTCM_FUNTAIL, dev->name); |
1360 | if ((grp->saved_state != MPCG_STATE_RESET) || |
1361 | /* dealloc_channel has been called */ |
1362 | (grp->port_persist == 0)) |
1363 | fsm_deltimer(timer: &priv->restart_timer); |
1364 | |
1365 | wch = priv->channel[CTCM_WRITE]; |
1366 | |
1367 | switch (grp->saved_state) { |
1368 | case MPCG_STATE_RESET: |
1369 | case MPCG_STATE_INOP: |
1370 | case MPCG_STATE_XID2INITW: |
1371 | case MPCG_STATE_XID0IOWAIT: |
1372 | case MPCG_STATE_XID2INITX: |
1373 | case MPCG_STATE_XID7INITW: |
1374 | case MPCG_STATE_XID7INITX: |
1375 | case MPCG_STATE_XID0IOWAIX: |
1376 | case MPCG_STATE_XID7INITI: |
1377 | case MPCG_STATE_XID7INITZ: |
1378 | case MPCG_STATE_XID7INITF: |
1379 | break; |
1380 | case MPCG_STATE_FLOWC: |
1381 | case MPCG_STATE_READY: |
1382 | default: |
1383 | tasklet_hi_schedule(t: &wch->ch_disc_tasklet); |
1384 | } |
1385 | |
1386 | grp->xid2_tgnum = 0; |
1387 | grp->group_max_buflen = 0; /*min of all received */ |
1388 | grp->outstanding_xid2 = 0; |
1389 | grp->outstanding_xid7 = 0; |
1390 | grp->outstanding_xid7_p2 = 0; |
1391 | grp->saved_xid2 = NULL; |
1392 | grp->xidnogood = 0; |
1393 | grp->changed_side = 0; |
1394 | |
1395 | grp->rcvd_xid_skb->data = grp->rcvd_xid_data; |
1396 | skb_reset_tail_pointer(skb: grp->rcvd_xid_skb); |
1397 | grp->rcvd_xid_skb->len = 0; |
1398 | grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; |
1399 | skb_put_data(skb: grp->rcvd_xid_skb, data: &thnorm, TH_HEADER_LENGTH); |
1400 | |
1401 | if (grp->send_qllc_disc == 1) { |
1402 | grp->send_qllc_disc = 0; |
1403 | mpc_send_qllc_discontact(dev); |
1404 | } |
1405 | |
1406 | /* DO NOT issue DEV_EVENT_STOP directly out of this code */ |
1407 | /* This can result in INOP of VTAM PU due to halting of */ |
1408 | /* outstanding IO which causes a sense to be returned */ |
1409 | /* Only about 3 senses are allowed and then IOS/VTAM will*/ |
1410 | /* become unreachable without manual intervention */ |
1411 | if ((grp->port_persist == 1) || (grp->alloc_called)) { |
1412 | grp->alloc_called = 0; |
1413 | fsm_deltimer(timer: &priv->restart_timer); |
1414 | fsm_addtimer(timer: &priv->restart_timer, millisec: 500, event: DEV_EVENT_RESTART, arg: dev); |
1415 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_RESET); |
1416 | if (grp->saved_state > MPCG_STATE_XID7INITF) |
1417 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, |
1418 | "%s(%s): MPC GROUP RECOVERY SCHEDULED" , |
1419 | CTCM_FUNTAIL, dev->name); |
1420 | } else { |
1421 | fsm_deltimer(timer: &priv->restart_timer); |
1422 | fsm_addtimer(timer: &priv->restart_timer, millisec: 500, event: DEV_EVENT_STOP, arg: dev); |
1423 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_RESET); |
1424 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, |
1425 | "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED" , |
1426 | CTCM_FUNTAIL, dev->name); |
1427 | } |
1428 | } |
1429 | |
1430 | /* |
1431 | * Handle mpc group action timeout. |
1432 | * MPC Group Station FSM action |
1433 | * CTCM_PROTO_MPC only |
1434 | * |
1435 | * fi An instance of an mpc_group fsm. |
1436 | * event The event, just happened. |
1437 | * arg Generic pointer, casted from net_device * upon call. |
1438 | */ |
1439 | static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) |
1440 | { |
1441 | struct net_device *dev = arg; |
1442 | struct ctcm_priv *priv; |
1443 | struct mpc_group *grp; |
1444 | struct channel *wch; |
1445 | struct channel *rch; |
1446 | |
1447 | priv = dev->ml_priv; |
1448 | grp = priv->mpcg; |
1449 | wch = priv->channel[CTCM_WRITE]; |
1450 | rch = priv->channel[CTCM_READ]; |
1451 | |
1452 | switch (fsm_getstate(fi: grp->fsm)) { |
1453 | case MPCG_STATE_XID2INITW: |
1454 | /* Unless there is outstanding IO on the */ |
1455 | /* channel just return and wait for ATTN */ |
1456 | /* interrupt to begin XID negotiations */ |
1457 | if ((fsm_getstate(fi: rch->fsm) == CH_XID0_PENDING) && |
1458 | (fsm_getstate(fi: wch->fsm) == CH_XID0_PENDING)) |
1459 | break; |
1460 | fallthrough; |
1461 | default: |
1462 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1463 | } |
1464 | |
1465 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, |
1466 | "%s: dev=%s exit" , |
1467 | CTCM_FUNTAIL, dev->name); |
1468 | return; |
1469 | } |
1470 | |
1471 | /* |
1472 | * MPC Group Station FSM action |
1473 | * CTCM_PROTO_MPC only |
1474 | */ |
1475 | void mpc_action_discontact(fsm_instance *fi, int event, void *arg) |
1476 | { |
1477 | struct mpcg_info *mpcginfo = arg; |
1478 | struct channel *ch = mpcginfo->ch; |
1479 | struct net_device *dev; |
1480 | struct ctcm_priv *priv; |
1481 | struct mpc_group *grp; |
1482 | |
1483 | if (ch) { |
1484 | dev = ch->netdev; |
1485 | if (dev) { |
1486 | priv = dev->ml_priv; |
1487 | if (priv) { |
1488 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, |
1489 | "%s: %s: %s\n" , |
1490 | CTCM_FUNTAIL, dev->name, ch->id); |
1491 | grp = priv->mpcg; |
1492 | grp->send_qllc_disc = 1; |
1493 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_INOP, arg: dev); |
1494 | } |
1495 | } |
1496 | } |
1497 | |
1498 | return; |
1499 | } |
1500 | |
1501 | /* |
1502 | * MPC Group Station - not part of FSM |
1503 | * CTCM_PROTO_MPC only |
1504 | * called from add_channel in ctcm_main.c |
1505 | */ |
1506 | void mpc_action_send_discontact(unsigned long thischan) |
1507 | { |
1508 | int rc; |
1509 | struct channel *ch = (struct channel *)thischan; |
1510 | unsigned long saveflags = 0; |
1511 | |
1512 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
1513 | rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0); |
1514 | spin_unlock_irqrestore(lock: get_ccwdev_lock(ch->cdev), flags: saveflags); |
1515 | |
1516 | if (rc != 0) { |
1517 | ctcm_ccw_check_rc(ch, rc, msg: (char *)__func__); |
1518 | } |
1519 | |
1520 | return; |
1521 | } |
1522 | |
1523 | |
1524 | /* |
1525 | * helper function of mpc FSM |
1526 | * CTCM_PROTO_MPC only |
1527 | * mpc_action_rcvd_xid7 |
1528 | */ |
1529 | static int mpc_validate_xid(struct mpcg_info *mpcginfo) |
1530 | { |
1531 | struct channel *ch = mpcginfo->ch; |
1532 | struct net_device *dev = ch->netdev; |
1533 | struct ctcm_priv *priv = dev->ml_priv; |
1534 | struct mpc_group *grp = priv->mpcg; |
1535 | struct xid2 *xid = mpcginfo->xid; |
1536 | int rc = 0; |
1537 | __u64 our_id = 0; |
1538 | __u64 their_id = 0; |
1539 | int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; |
1540 | |
1541 | CTCM_PR_DEBUG("Enter %s: xid=%p\n" , __func__, xid); |
1542 | |
1543 | if (xid == NULL) { |
1544 | rc = 1; |
1545 | /* XID REJECTED: xid == NULL */ |
1546 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1547 | "%s(%s): xid = NULL" , |
1548 | CTCM_FUNTAIL, ch->id); |
1549 | goto done; |
1550 | } |
1551 | |
1552 | CTCM_D3_DUMP((char *)xid, XID2_LENGTH); |
1553 | |
1554 | /*the received direction should be the opposite of ours */ |
1555 | if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : |
1556 | XID2_READ_SIDE) != xid->xid2_dlc_type) { |
1557 | rc = 2; |
1558 | /* XID REJECTED: r/w channel pairing mismatch */ |
1559 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1560 | "%s(%s): r/w channel pairing mismatch" , |
1561 | CTCM_FUNTAIL, ch->id); |
1562 | goto done; |
1563 | } |
1564 | |
1565 | if (xid->xid2_dlc_type == XID2_READ_SIDE) { |
1566 | CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n" , __func__, |
1567 | grp->group_max_buflen, xid->xid2_buf_len); |
1568 | |
1569 | if (grp->group_max_buflen == 0 || grp->group_max_buflen > |
1570 | xid->xid2_buf_len - len) |
1571 | grp->group_max_buflen = xid->xid2_buf_len - len; |
1572 | } |
1573 | |
1574 | if (grp->saved_xid2 == NULL) { |
1575 | grp->saved_xid2 = |
1576 | (struct xid2 *)skb_tail_pointer(skb: grp->rcvd_xid_skb); |
1577 | |
1578 | skb_put_data(skb: grp->rcvd_xid_skb, data: xid, XID2_LENGTH); |
1579 | grp->rcvd_xid_skb->data = grp->rcvd_xid_data; |
1580 | |
1581 | skb_reset_tail_pointer(skb: grp->rcvd_xid_skb); |
1582 | grp->rcvd_xid_skb->len = 0; |
1583 | |
1584 | /* convert two 32 bit numbers into 1 64 bit for id compare */ |
1585 | our_id = (__u64)priv->xid->xid2_adj_id; |
1586 | our_id = our_id << 32; |
1587 | our_id = our_id + priv->xid->xid2_sender_id; |
1588 | their_id = (__u64)xid->xid2_adj_id; |
1589 | their_id = their_id << 32; |
1590 | their_id = their_id + xid->xid2_sender_id; |
1591 | /* lower id assume the xside role */ |
1592 | if (our_id < their_id) { |
1593 | grp->roll = XSIDE; |
1594 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, |
1595 | "%s(%s): WE HAVE LOW ID - TAKE XSIDE" , |
1596 | CTCM_FUNTAIL, ch->id); |
1597 | } else { |
1598 | grp->roll = YSIDE; |
1599 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, |
1600 | "%s(%s): WE HAVE HIGH ID - TAKE YSIDE" , |
1601 | CTCM_FUNTAIL, ch->id); |
1602 | } |
1603 | |
1604 | } else { |
1605 | if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { |
1606 | rc = 3; |
1607 | /* XID REJECTED: xid flag byte4 mismatch */ |
1608 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1609 | "%s(%s): xid flag byte4 mismatch" , |
1610 | CTCM_FUNTAIL, ch->id); |
1611 | } |
1612 | if (xid->xid2_flag2 == 0x40) { |
1613 | rc = 4; |
1614 | /* XID REJECTED - xid NOGOOD */ |
1615 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1616 | "%s(%s): xid NOGOOD" , |
1617 | CTCM_FUNTAIL, ch->id); |
1618 | } |
1619 | if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { |
1620 | rc = 5; |
1621 | /* XID REJECTED - Adjacent Station ID Mismatch */ |
1622 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1623 | "%s(%s): Adjacent Station ID Mismatch" , |
1624 | CTCM_FUNTAIL, ch->id); |
1625 | } |
1626 | if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { |
1627 | rc = 6; |
1628 | /* XID REJECTED - Sender Address Mismatch */ |
1629 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1630 | "%s(%s): Sender Address Mismatch" , |
1631 | CTCM_FUNTAIL, ch->id); |
1632 | } |
1633 | } |
1634 | done: |
1635 | if (rc) { |
1636 | dev_warn(&dev->dev, |
1637 | "The XID used in the MPC protocol is not valid, " |
1638 | "rc = %d\n" , rc); |
1639 | priv->xid->xid2_flag2 = 0x40; |
1640 | grp->saved_xid2->xid2_flag2 = 0x40; |
1641 | } |
1642 | |
1643 | return rc; |
1644 | } |
1645 | |
1646 | /* |
1647 | * MPC Group Station FSM action |
1648 | * CTCM_PROTO_MPC only |
1649 | */ |
1650 | static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) |
1651 | { |
1652 | struct channel *ch = arg; |
1653 | int rc = 0; |
1654 | int gotlock = 0; |
1655 | unsigned long saveflags = 0; /* avoids compiler warning with |
1656 | spin_unlock_irqrestore */ |
1657 | |
1658 | CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n" , |
1659 | __func__, smp_processor_id(), ch, ch->id); |
1660 | |
1661 | if (ctcm_checkalloc_buffer(ch)) |
1662 | goto done; |
1663 | |
1664 | /* |
1665 | * skb data-buffer referencing: |
1666 | */ |
1667 | ch->trans_skb->data = ch->trans_skb_data; |
1668 | skb_reset_tail_pointer(skb: ch->trans_skb); |
1669 | ch->trans_skb->len = 0; |
1670 | /* result of the previous 3 statements is NOT always |
1671 | * already set after ctcm_checkalloc_buffer |
1672 | * because of possible reuse of the trans_skb |
1673 | */ |
1674 | memset(ch->trans_skb->data, 0, 16); |
1675 | ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; |
1676 | /* check is main purpose here: */ |
1677 | skb_put(skb: ch->trans_skb, TH_HEADER_LENGTH); |
1678 | ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(skb: ch->trans_skb); |
1679 | /* check is main purpose here: */ |
1680 | skb_put(skb: ch->trans_skb, XID2_LENGTH); |
1681 | ch->rcvd_xid_id = skb_tail_pointer(skb: ch->trans_skb); |
1682 | /* cleanup back to startpoint */ |
1683 | ch->trans_skb->data = ch->trans_skb_data; |
1684 | skb_reset_tail_pointer(skb: ch->trans_skb); |
1685 | ch->trans_skb->len = 0; |
1686 | |
1687 | /* non-checking rewrite of above skb data-buffer referencing: */ |
1688 | /* |
1689 | memset(ch->trans_skb->data, 0, 16); |
1690 | ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; |
1691 | ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); |
1692 | ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; |
1693 | */ |
1694 | |
1695 | ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1696 | ch->ccw[8].count = 0; |
1697 | ch->ccw[8].cda = 0x00; |
1698 | |
1699 | if (!(ch->xid_th && ch->xid && ch->xid_id)) |
1700 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, |
1701 | "%s(%s): xid_th=%p, xid=%p, xid_id=%p" , |
1702 | CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); |
1703 | |
1704 | if (side == XSIDE) { |
1705 | /* mpc_action_xside_xid */ |
1706 | if (ch->xid_th == NULL) |
1707 | goto done; |
1708 | ch->ccw[9].cmd_code = CCW_CMD_WRITE; |
1709 | ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1710 | ch->ccw[9].count = TH_HEADER_LENGTH; |
1711 | ch->ccw[9].cda = virt_to_phys(ch->xid_th); |
1712 | |
1713 | if (ch->xid == NULL) |
1714 | goto done; |
1715 | ch->ccw[10].cmd_code = CCW_CMD_WRITE; |
1716 | ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1717 | ch->ccw[10].count = XID2_LENGTH; |
1718 | ch->ccw[10].cda = virt_to_phys(ch->xid); |
1719 | |
1720 | ch->ccw[11].cmd_code = CCW_CMD_READ; |
1721 | ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1722 | ch->ccw[11].count = TH_HEADER_LENGTH; |
1723 | ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); |
1724 | |
1725 | ch->ccw[12].cmd_code = CCW_CMD_READ; |
1726 | ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1727 | ch->ccw[12].count = XID2_LENGTH; |
1728 | ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); |
1729 | |
1730 | ch->ccw[13].cmd_code = CCW_CMD_READ; |
1731 | ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); |
1732 | |
1733 | } else { /* side == YSIDE : mpc_action_yside_xid */ |
1734 | ch->ccw[9].cmd_code = CCW_CMD_READ; |
1735 | ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1736 | ch->ccw[9].count = TH_HEADER_LENGTH; |
1737 | ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); |
1738 | |
1739 | ch->ccw[10].cmd_code = CCW_CMD_READ; |
1740 | ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1741 | ch->ccw[10].count = XID2_LENGTH; |
1742 | ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); |
1743 | |
1744 | if (ch->xid_th == NULL) |
1745 | goto done; |
1746 | ch->ccw[11].cmd_code = CCW_CMD_WRITE; |
1747 | ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1748 | ch->ccw[11].count = TH_HEADER_LENGTH; |
1749 | ch->ccw[11].cda = virt_to_phys(ch->xid_th); |
1750 | |
1751 | if (ch->xid == NULL) |
1752 | goto done; |
1753 | ch->ccw[12].cmd_code = CCW_CMD_WRITE; |
1754 | ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1755 | ch->ccw[12].count = XID2_LENGTH; |
1756 | ch->ccw[12].cda = virt_to_phys(ch->xid); |
1757 | |
1758 | if (ch->xid_id == NULL) |
1759 | goto done; |
1760 | ch->ccw[13].cmd_code = CCW_CMD_WRITE; |
1761 | ch->ccw[13].cda = virt_to_phys(ch->xid_id); |
1762 | |
1763 | } |
1764 | ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
1765 | ch->ccw[13].count = 4; |
1766 | |
1767 | ch->ccw[14].cmd_code = CCW_CMD_NOOP; |
1768 | ch->ccw[14].flags = CCW_FLAG_SLI; |
1769 | ch->ccw[14].count = 0; |
1770 | ch->ccw[14].cda = 0; |
1771 | |
1772 | CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); |
1773 | CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); |
1774 | CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); |
1775 | CTCM_D3_DUMP((char *)ch->xid_id, 4); |
1776 | |
1777 | if (!in_hardirq()) { |
1778 | /* Such conditional locking is a known problem for |
1779 | * sparse because its static undeterministic. |
1780 | * Warnings should be ignored here. */ |
1781 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
1782 | gotlock = 1; |
1783 | } |
1784 | |
1785 | fsm_addtimer(timer: &ch->timer, millisec: 5000 , event: CTC_EVENT_TIMER, arg: ch); |
1786 | rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0); |
1787 | |
1788 | if (gotlock) /* see remark above about conditional locking */ |
1789 | spin_unlock_irqrestore(lock: get_ccwdev_lock(ch->cdev), flags: saveflags); |
1790 | |
1791 | if (rc != 0) { |
1792 | ctcm_ccw_check_rc(ch, rc, |
1793 | msg: (side == XSIDE) ? "x-side XID" : "y-side XID" ); |
1794 | } |
1795 | |
1796 | done: |
1797 | CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n" , |
1798 | __func__, ch, ch->id); |
1799 | return; |
1800 | |
1801 | } |
1802 | |
1803 | /* |
1804 | * MPC Group Station FSM action |
1805 | * CTCM_PROTO_MPC only |
1806 | */ |
1807 | static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) |
1808 | { |
1809 | mpc_action_side_xid(fsm, arg, XSIDE); |
1810 | } |
1811 | |
1812 | /* |
1813 | * MPC Group Station FSM action |
1814 | * CTCM_PROTO_MPC only |
1815 | */ |
1816 | static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) |
1817 | { |
1818 | mpc_action_side_xid(fsm, arg, YSIDE); |
1819 | } |
1820 | |
1821 | /* |
1822 | * MPC Group Station FSM action |
1823 | * CTCM_PROTO_MPC only |
1824 | */ |
1825 | static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) |
1826 | { |
1827 | struct channel *ch = arg; |
1828 | struct net_device *dev = ch->netdev; |
1829 | struct ctcm_priv *priv = dev->ml_priv; |
1830 | struct mpc_group *grp = priv->mpcg; |
1831 | |
1832 | CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n" , |
1833 | __func__, smp_processor_id(), ch, ch->id); |
1834 | |
1835 | if (ch->xid == NULL) { |
1836 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
1837 | "%s(%s): ch->xid == NULL" , |
1838 | CTCM_FUNTAIL, dev->name); |
1839 | return; |
1840 | } |
1841 | |
1842 | fsm_newstate(fi: ch->fsm, newstate: CH_XID0_INPROGRESS); |
1843 | |
1844 | ch->xid->xid2_option = XID2_0; |
1845 | |
1846 | switch (fsm_getstate(fi: grp->fsm)) { |
1847 | case MPCG_STATE_XID2INITW: |
1848 | case MPCG_STATE_XID2INITX: |
1849 | ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; |
1850 | break; |
1851 | case MPCG_STATE_XID0IOWAIT: |
1852 | case MPCG_STATE_XID0IOWAIX: |
1853 | ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; |
1854 | break; |
1855 | } |
1856 | |
1857 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_DOIO, arg: ch); |
1858 | |
1859 | return; |
1860 | } |
1861 | |
1862 | /* |
1863 | * MPC Group Station FSM action |
1864 | * CTCM_PROTO_MPC only |
1865 | */ |
1866 | static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) |
1867 | { |
1868 | struct net_device *dev = arg; |
1869 | struct ctcm_priv *priv = dev->ml_priv; |
1870 | struct mpc_group *grp = NULL; |
1871 | int direction; |
1872 | int send = 0; |
1873 | |
1874 | if (priv) |
1875 | grp = priv->mpcg; |
1876 | if (grp == NULL) |
1877 | return; |
1878 | |
1879 | for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { |
1880 | struct channel *ch = priv->channel[direction]; |
1881 | struct xid2 *thisxid = ch->xid; |
1882 | ch->xid_skb->data = ch->xid_skb_data; |
1883 | skb_reset_tail_pointer(skb: ch->xid_skb); |
1884 | ch->xid_skb->len = 0; |
1885 | thisxid->xid2_option = XID2_7; |
1886 | send = 0; |
1887 | |
1888 | /* xid7 phase 1 */ |
1889 | if (grp->outstanding_xid7_p2 > 0) { |
1890 | if (grp->roll == YSIDE) { |
1891 | if (fsm_getstate(fi: ch->fsm) == CH_XID7_PENDING1) { |
1892 | fsm_newstate(fi: ch->fsm, newstate: CH_XID7_PENDING2); |
1893 | ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; |
1894 | skb_put_data(skb: ch->xid_skb, data: &thdummy, |
1895 | TH_HEADER_LENGTH); |
1896 | send = 1; |
1897 | } |
1898 | } else if (fsm_getstate(fi: ch->fsm) < CH_XID7_PENDING2) { |
1899 | fsm_newstate(fi: ch->fsm, newstate: CH_XID7_PENDING2); |
1900 | ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; |
1901 | skb_put_data(skb: ch->xid_skb, data: &thnorm, |
1902 | TH_HEADER_LENGTH); |
1903 | send = 1; |
1904 | } |
1905 | } else { |
1906 | /* xid7 phase 2 */ |
1907 | if (grp->roll == YSIDE) { |
1908 | if (fsm_getstate(fi: ch->fsm) < CH_XID7_PENDING4) { |
1909 | fsm_newstate(fi: ch->fsm, newstate: CH_XID7_PENDING4); |
1910 | skb_put_data(skb: ch->xid_skb, data: &thnorm, |
1911 | TH_HEADER_LENGTH); |
1912 | ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; |
1913 | send = 1; |
1914 | } |
1915 | } else if (fsm_getstate(fi: ch->fsm) == CH_XID7_PENDING3) { |
1916 | fsm_newstate(fi: ch->fsm, newstate: CH_XID7_PENDING4); |
1917 | ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; |
1918 | skb_put_data(skb: ch->xid_skb, data: &thdummy, |
1919 | TH_HEADER_LENGTH); |
1920 | send = 1; |
1921 | } |
1922 | } |
1923 | |
1924 | if (send) |
1925 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_DOIO, arg: ch); |
1926 | } |
1927 | |
1928 | return; |
1929 | } |
1930 | |
1931 | /* |
1932 | * MPC Group Station FSM action |
1933 | * CTCM_PROTO_MPC only |
1934 | */ |
1935 | static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) |
1936 | { |
1937 | |
1938 | struct mpcg_info *mpcginfo = arg; |
1939 | struct channel *ch = mpcginfo->ch; |
1940 | struct net_device *dev = ch->netdev; |
1941 | struct ctcm_priv *priv = dev->ml_priv; |
1942 | struct mpc_group *grp = priv->mpcg; |
1943 | |
1944 | CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n" , |
1945 | __func__, ch->id, grp->outstanding_xid2, |
1946 | grp->outstanding_xid7, grp->outstanding_xid7_p2); |
1947 | |
1948 | if (fsm_getstate(fi: ch->fsm) < CH_XID7_PENDING) |
1949 | fsm_newstate(fi: ch->fsm, newstate: CH_XID7_PENDING); |
1950 | |
1951 | grp->outstanding_xid2--; |
1952 | grp->outstanding_xid7++; |
1953 | grp->outstanding_xid7_p2++; |
1954 | |
1955 | /* must change state before validating xid to */ |
1956 | /* properly handle interim interrupts received*/ |
1957 | switch (fsm_getstate(fi: grp->fsm)) { |
1958 | case MPCG_STATE_XID2INITW: |
1959 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID2INITX); |
1960 | mpc_validate_xid(mpcginfo); |
1961 | break; |
1962 | case MPCG_STATE_XID0IOWAIT: |
1963 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID0IOWAIX); |
1964 | mpc_validate_xid(mpcginfo); |
1965 | break; |
1966 | case MPCG_STATE_XID2INITX: |
1967 | if (grp->outstanding_xid2 == 0) { |
1968 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID7INITW); |
1969 | mpc_validate_xid(mpcginfo); |
1970 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID2DONE, arg: dev); |
1971 | } |
1972 | break; |
1973 | case MPCG_STATE_XID0IOWAIX: |
1974 | if (grp->outstanding_xid2 == 0) { |
1975 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID7INITI); |
1976 | mpc_validate_xid(mpcginfo); |
1977 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID2DONE, arg: dev); |
1978 | } |
1979 | break; |
1980 | } |
1981 | |
1982 | CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n" , |
1983 | __func__, ch->id, grp->outstanding_xid2, |
1984 | grp->outstanding_xid7, grp->outstanding_xid7_p2); |
1985 | CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n" , |
1986 | __func__, ch->id, |
1987 | fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); |
1988 | return; |
1989 | |
1990 | } |
1991 | |
1992 | |
1993 | /* |
1994 | * MPC Group Station FSM action |
1995 | * CTCM_PROTO_MPC only |
1996 | */ |
1997 | static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) |
1998 | { |
1999 | struct mpcg_info *mpcginfo = arg; |
2000 | struct channel *ch = mpcginfo->ch; |
2001 | struct net_device *dev = ch->netdev; |
2002 | struct ctcm_priv *priv = dev->ml_priv; |
2003 | struct mpc_group *grp = priv->mpcg; |
2004 | |
2005 | CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n" , |
2006 | __func__, smp_processor_id(), ch, ch->id); |
2007 | CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n" , |
2008 | __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); |
2009 | |
2010 | grp->outstanding_xid7--; |
2011 | ch->xid_skb->data = ch->xid_skb_data; |
2012 | skb_reset_tail_pointer(skb: ch->xid_skb); |
2013 | ch->xid_skb->len = 0; |
2014 | |
2015 | switch (fsm_getstate(fi: grp->fsm)) { |
2016 | case MPCG_STATE_XID7INITI: |
2017 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID7INITZ); |
2018 | mpc_validate_xid(mpcginfo); |
2019 | break; |
2020 | case MPCG_STATE_XID7INITW: |
2021 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID7INITX); |
2022 | mpc_validate_xid(mpcginfo); |
2023 | break; |
2024 | case MPCG_STATE_XID7INITZ: |
2025 | case MPCG_STATE_XID7INITX: |
2026 | if (grp->outstanding_xid7 == 0) { |
2027 | if (grp->outstanding_xid7_p2 > 0) { |
2028 | grp->outstanding_xid7 = |
2029 | grp->outstanding_xid7_p2; |
2030 | grp->outstanding_xid7_p2 = 0; |
2031 | } else |
2032 | fsm_newstate(fi: grp->fsm, newstate: MPCG_STATE_XID7INITF); |
2033 | |
2034 | mpc_validate_xid(mpcginfo); |
2035 | fsm_event(fi: grp->fsm, event: MPCG_EVENT_XID7DONE, arg: dev); |
2036 | break; |
2037 | } |
2038 | mpc_validate_xid(mpcginfo); |
2039 | break; |
2040 | } |
2041 | return; |
2042 | } |
2043 | |
2044 | /* |
2045 | * mpc_action helper of an MPC Group Station FSM action |
2046 | * CTCM_PROTO_MPC only |
2047 | */ |
2048 | static int mpc_send_qllc_discontact(struct net_device *dev) |
2049 | { |
2050 | struct sk_buff *skb; |
2051 | struct qllc *qllcptr; |
2052 | struct ctcm_priv *priv = dev->ml_priv; |
2053 | struct mpc_group *grp = priv->mpcg; |
2054 | |
2055 | CTCM_PR_DEBUG("%s: GROUP STATE: %s\n" , |
2056 | __func__, mpcg_state_names[grp->saved_state]); |
2057 | |
2058 | switch (grp->saved_state) { |
2059 | /* |
2060 | * establish conn callback function is |
2061 | * preferred method to report failure |
2062 | */ |
2063 | case MPCG_STATE_XID0IOWAIT: |
2064 | case MPCG_STATE_XID0IOWAIX: |
2065 | case MPCG_STATE_XID7INITI: |
2066 | case MPCG_STATE_XID7INITZ: |
2067 | case MPCG_STATE_XID2INITW: |
2068 | case MPCG_STATE_XID2INITX: |
2069 | case MPCG_STATE_XID7INITW: |
2070 | case MPCG_STATE_XID7INITX: |
2071 | if (grp->estconnfunc) { |
2072 | grp->estconnfunc(grp->port_num, -1, 0); |
2073 | grp->estconnfunc = NULL; |
2074 | break; |
2075 | } |
2076 | fallthrough; |
2077 | case MPCG_STATE_FLOWC: |
2078 | case MPCG_STATE_READY: |
2079 | grp->send_qllc_disc = 2; |
2080 | |
2081 | skb = __dev_alloc_skb(length: sizeof(struct qllc), GFP_ATOMIC); |
2082 | if (skb == NULL) { |
2083 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
2084 | "%s(%s): skb allocation error" , |
2085 | CTCM_FUNTAIL, dev->name); |
2086 | priv->stats.rx_dropped++; |
2087 | return -ENOMEM; |
2088 | } |
2089 | |
2090 | qllcptr = skb_put(skb, len: sizeof(struct qllc)); |
2091 | qllcptr->qllc_address = 0xcc; |
2092 | qllcptr->qllc_commands = 0x03; |
2093 | |
2094 | if (skb_headroom(skb) < 4) { |
2095 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
2096 | "%s(%s): skb_headroom error" , |
2097 | CTCM_FUNTAIL, dev->name); |
2098 | dev_kfree_skb_any(skb); |
2099 | return -ENOMEM; |
2100 | } |
2101 | |
2102 | *((__u32 *)skb_push(skb, len: 4)) = |
2103 | priv->channel[CTCM_READ]->pdu_seq; |
2104 | priv->channel[CTCM_READ]->pdu_seq++; |
2105 | CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n" , |
2106 | __func__, priv->channel[CTCM_READ]->pdu_seq); |
2107 | |
2108 | /* receipt of CC03 resets anticipated sequence number on |
2109 | receiving side */ |
2110 | priv->channel[CTCM_READ]->pdu_seq = 0x00; |
2111 | skb_reset_mac_header(skb); |
2112 | skb->dev = dev; |
2113 | skb->protocol = htons(ETH_P_SNAP); |
2114 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
2115 | |
2116 | CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); |
2117 | |
2118 | netif_rx(skb); |
2119 | break; |
2120 | default: |
2121 | break; |
2122 | |
2123 | } |
2124 | |
2125 | return 0; |
2126 | } |
2127 | /* --- This is the END my friend --- */ |
2128 | |
2129 | |