1 // SPDX-License-Identifier: GPL-2.0
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)
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);
21 #define KMSG_COMPONENT "ctcm"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
34 #include <linux/signal.h>
35 #include <linux/string.h>
36 #include <linux/proc_fs.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>
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>
55 #include "ctcm_main.h"
57 #include "ctcm_fsms.h"
59 static const struct xid2 init_xid = {
60 .xid2_type_id = XID_FM2,
72 .xid2_option = XID2_0,
75 .xid2_dlc_type = XID2_READ_SIDE,
79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
82 static const struct th_header thnorm = {
84 .th_ch_flag = TH_IS_XID,
85 .th_blk_flag = TH_DATA_IS_XID,
87 .th_seq_num = 0x00000000,
90 static const struct th_header thdummy = {
93 .th_blk_flag = TH_DATA_IS_XID,
95 .th_seq_num = 0x00000000,
99 * Definition of one MPC group
103 * Compatibility macros for busy handling
104 * of network devices.
107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
110 * MPC Group state machine actions (static prototypes)
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);
125 /*-------------------------------------------------------------------*
126 * Dump buffer format *
128 *--------------------------------------------------------------------*/
129 void ctcmpc_dumpit(char *buf, int len)
131 __u32 ct, sw, rm, dup;
133 char tbuf[82], tdup[82];
136 char bhex[82], duphex[82];
145 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
147 scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr);
149 scnprintf(boff, sizeof(boff), "%4.4X", (__u32)ct);
153 if ((sw == 4) || (sw == 12))
158 scnprintf(tbuf, sizeof(tbuf), "%2.2llX", (__u64)*ptr);
162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
172 if ((strcmp(duphex, bhex)) != 0) {
174 scnprintf(tdup, sizeof(tdup),
175 "Duplicate as above to %s", addr);
176 ctcm_pr_debug(" --- %s ---\n",
179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
180 addr, boff, bhex, basc);
182 strcpy(duphex, bhex);
191 for ( ; rm > 0; rm--, sw++) {
192 if ((sw == 4) || (sw == 12))
200 scnprintf(tdup, sizeof(tdup),
201 "Duplicate as above to %s", addr);
202 ctcm_pr_debug(" --- %s ---\n", tdup);
204 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
205 addr, boff, bhex, basc);
208 scnprintf(tdup, sizeof(tdup),
209 "Duplicate as above to %s", addr);
210 ctcm_pr_debug(" --- %s ---\n", tdup);
213 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
214 addr, boff, bhex, basc);
220 } /* end of ctcmpc_dumpit */
225 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
227 * skb The sk_buff to dump.
228 * offset Offset relative to skb-data, where to start the dump.
230 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
233 struct th_header *header;
242 header = (struct th_header *)p;
244 ctcm_pr_debug("dump:\n");
245 ctcm_pr_debug("skb len=%d \n", skb->len);
247 switch (header->th_ch_flag) {
252 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
253 (header->th_is_xid == 0x01))
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);
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);
283 ctcm_pr_debug("data: ");
284 for (i = 0; i < bl; i++)
285 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
290 static struct net_device *ctcmpc_get_dev(int port_num)
293 struct net_device *dev;
294 struct ctcm_priv *priv;
296 scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num);
298 dev = __dev_get_by_name(&init_net, device);
301 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
302 "%s: Device not found by name: %s",
303 CTCM_FUNTAIL, device);
308 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
309 "%s(%s): dev->ml_priv is NULL",
310 CTCM_FUNTAIL, device);
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);
323 * ctc_mpc_alloc_channel
324 * (exported interface)
326 * Device Initialization :
327 * ACTPATH driven IO operations
329 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
331 struct net_device *dev;
332 struct mpc_group *grp;
333 struct ctcm_priv *priv;
335 dev = ctcmpc_get_dev(port_num);
341 grp->allochanfunc = callback;
342 grp->port_num = port_num;
343 grp->port_persist = 1;
345 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
347 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
349 switch (fsm_getstate(grp->fsm)) {
350 case MPCG_STATE_INOP:
351 /* Group is in the process of terminating */
352 grp->alloc_called = 1;
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*/
359 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
361 grp->send_qllc_disc = 1;
363 case MPCG_STATE_XID0IOWAIT:
364 fsm_deltimer(&grp->timer);
365 grp->outstanding_xid2 = 0;
366 grp->outstanding_xid7 = 0;
367 grp->outstanding_xid7_p2 = 0;
368 grp->saved_xid2 = NULL;
371 fsm_event(priv->fsm, DEV_EVENT_START, dev);
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);
383 /* there are problems...bail out */
384 /* there may be a state mismatch so restart */
385 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
386 grp->allocchan_callback_retries = 0;
393 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
396 * ctc_mpc_establish_connectivity
397 * (exported interface)
399 void ctc_mpc_establish_connectivity(int port_num,
400 void (*callback)(int, int, int))
402 struct net_device *dev;
403 struct mpc_group *grp;
404 struct ctcm_priv *priv;
405 struct channel *rch, *wch;
407 dev = ctcmpc_get_dev(port_num);
412 rch = priv->channel[CTCM_READ];
413 wch = priv->channel[CTCM_WRITE];
415 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
417 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
419 grp->estconnfunc = callback;
420 grp->port_num = port_num;
422 switch (fsm_getstate(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(&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;
436 /* there are problems...bail out */
437 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
438 grp->estconn_callback_retries = 0;
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*/
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;
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 */
459 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
460 (fsm_getstate(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);
466 grp->send_qllc_disc = 1;
467 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
468 fsm_deltimer(&grp->timer);
469 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
470 MPCG_EVENT_TIMER, 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(rch->fsm) == CH_XID0_PENDING))
476 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
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;
485 fsm_deltimer(&grp->timer);
488 if ((wch->in_mpcgroup) &&
489 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
490 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
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;
499 fsm_deltimer(&grp->timer);
503 case MPCG_STATE_XID0IOWAIT:
504 /* already in active XID negotiations */
510 CTCM_PR_DEBUG("Exit %s()\n", __func__);
513 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
517 * (exported interface)
519 void ctc_mpc_dealloc_ch(int port_num)
521 struct net_device *dev;
522 struct ctcm_priv *priv;
523 struct mpc_group *grp;
525 dev = ctcmpc_get_dev(port_num);
531 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
532 "%s: %s: refcount = %d\n",
533 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
535 fsm_deltimer(&priv->restart_timer);
536 grp->channels_terminating = 0;
537 fsm_deltimer(&grp->timer);
538 grp->allochanfunc = NULL;
539 grp->estconnfunc = NULL;
540 grp->port_persist = 0;
541 grp->send_qllc_disc = 0;
542 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
547 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
550 * ctc_mpc_flow_control
551 * (exported interface)
553 void ctc_mpc_flow_control(int port_num, int flowc)
555 struct ctcm_priv *priv;
556 struct mpc_group *grp;
557 struct net_device *dev;
561 dev = ctcmpc_get_dev(port_num);
567 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
568 "%s: %s: flowc = %d",
569 CTCM_FUNTAIL, dev->name, flowc);
571 rch = priv->channel[CTCM_READ];
573 mpcg_state = fsm_getstate(grp->fsm);
576 if (mpcg_state == MPCG_STATE_FLOWC)
578 if (mpcg_state == MPCG_STATE_READY) {
579 if (grp->flow_off_called == 1)
580 grp->flow_off_called = 0;
582 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
587 if (mpcg_state == MPCG_STATE_FLOWC) {
588 fsm_newstate(grp->fsm, MPCG_STATE_READY);
589 /* ensure any data that has accumulated */
590 /* on the io_queue will now be sen t */
591 tasklet_schedule(&rch->ch_tasklet);
593 /* possible race condition */
594 if (mpcg_state == MPCG_STATE_READY) {
595 grp->flow_off_called = 1;
602 EXPORT_SYMBOL(ctc_mpc_flow_control);
604 static int mpc_send_qllc_discontact(struct net_device *);
607 * helper function of ctcmpc_unpack_skb
609 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
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];
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);
620 grp->sweep_rsp_pend_num--;
622 if ((grp->sweep_req_pend_num == 0) &&
623 (grp->sweep_rsp_pend_num == 0)) {
624 fsm_deltimer(&ch->sweep_timer);
626 rch->th_seq_num = 0x00;
627 ch->th_seq_num = 0x00;
628 ctcm_clear_busy_do(dev);
636 * helper function of mpc_rcvd_sweep_req
637 * which is a helper of ctcmpc_unpack_skb
639 static void ctcmpc_send_sweep_resp(struct channel *rch)
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 *header;
645 struct sk_buff *sweep_skb;
646 struct channel *ch = priv->channel[CTCM_WRITE];
648 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
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);
658 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
659 header->th.th_ch_flag = TH_SWEEP_RESP;
660 header->sw.th_last_seq = ch->th_seq_num;
662 netif_trans_update(dev);
663 skb_queue_tail(&ch->sweep_queue, sweep_skb);
665 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
671 ctcm_clear_busy_do(dev);
672 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
678 * helper function of ctcmpc_unpack_skb
680 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
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];
689 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
690 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
692 if (grp->in_sweep == 0) {
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];
699 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
701 grp->sweep_req_pend_num--;
702 ctcmpc_send_sweep_resp(ch);
708 * MPC Group Station FSM definitions
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",
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",
738 * The MPC Group Station FSM
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 },
746 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
747 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
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 },
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 },
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 },
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 },
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 },
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 },
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 },
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 },
805 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
806 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
809 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
812 * MPC Group Station FSM action
813 * CTCM_PROTO_MPC only
815 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
817 struct net_device *dev = arg;
818 struct ctcm_priv *priv = dev->ml_priv;
819 struct mpc_group *grp = priv->mpcg;
822 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
823 "%s(%s): No MPC group",
824 CTCM_FUNTAIL, dev->name);
828 fsm_deltimer(&grp->timer);
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;
839 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
840 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
842 CTCM_FUNTAIL, dev->name);
846 grp->port_persist = 1;
847 grp->out_of_sequence = 0;
848 grp->estconn_called = 0;
850 tasklet_hi_schedule(&grp->mpc_tasklet2);
856 * helper of ctcm_init_netdevice
857 * CTCM_PROTO_MPC only
859 void mpc_group_ready(unsigned long adev)
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;
867 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
868 "%s(%s): No MPC group",
869 CTCM_FUNTAIL, dev->name);
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);
877 fsm_newstate(grp->fsm, MPCG_STATE_READY);
879 /* Put up a read on the channel */
880 ch = priv->channel[CTCM_READ];
882 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
883 __func__, ch->pdu_seq);
885 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
886 /* Put the write channel in idle state */
887 ch = priv->channel[CTCM_WRITE];
888 if (ch->collect_len > 0) {
889 spin_lock(&ch->collect_lock);
890 ctcm_purge_skb_queue(&ch->collect_queue);
892 spin_unlock(&ch->collect_lock);
894 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
895 ctcm_clear_busy(dev);
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);
905 grp->send_qllc_disc = 1;
906 grp->changed_side = 0;
913 * Increment the MPC Group Active Channel Counts
914 * helper of dev_action (called from channel fsm)
916 void mpc_channel_action(struct channel *ch, int direction, int action)
918 struct net_device *dev = ch->netdev;
919 struct ctcm_priv *priv = dev->ml_priv;
920 struct mpc_group *grp = priv->mpcg;
923 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
924 "%s(%s): No MPC group",
925 CTCM_FUNTAIL, dev->name);
929 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
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]);
938 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
939 grp->num_channel_paths++;
940 grp->active_channels[direction]++;
941 grp->outstanding_xid2++;
944 if (ch->xid_skb != NULL)
945 dev_kfree_skb_any(ch->xid_skb);
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(grp->fsm, MPCG_EVENT_INOP, dev);
956 ch->xid_skb_data = ch->xid_skb->data;
957 ch->xid_th = (struct th_header *)ch->xid_skb->data;
958 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
959 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
960 skb_put(ch->xid_skb, XID2_LENGTH);
961 ch->xid_id = skb_tail_pointer(ch->xid_skb);
962 ch->xid_skb->data = ch->xid_skb_data;
963 skb_reset_tail_pointer(ch->xid_skb);
964 ch->xid_skb->len = 0;
966 skb_put_data(ch->xid_skb, grp->xid_skb->data,
969 ch->xid->xid2_dlc_type =
970 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
971 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
973 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
974 ch->xid->xid2_buf_len = 0x00;
976 ch->xid_skb->data = ch->xid_skb_data;
977 skb_reset_tail_pointer(ch->xid_skb);
978 ch->xid_skb->len = 0;
980 fsm_newstate(ch->fsm, CH_XID0_PENDING);
982 if ((grp->active_channels[CTCM_READ] > 0) &&
983 (grp->active_channels[CTCM_WRITE] > 0) &&
984 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
985 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
986 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
987 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
988 __func__, dev->name);
990 } else if ((action == MPC_CHANNEL_REMOVE) &&
991 (ch->in_mpcgroup == 1)) {
993 grp->num_channel_paths--;
994 grp->active_channels[direction]--;
996 if (ch->xid_skb != NULL)
997 dev_kfree_skb_any(ch->xid_skb);
1000 if (grp->channels_terminating)
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(grp->fsm, MPCG_EVENT_INOP, dev);
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]);
1017 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1021 * Unpack a just received skb and hand it over to
1023 * special MPC version of unpack_skb.
1025 * ch The channel where this skb has been received.
1026 * pskb The received skb.
1028 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
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 *header = NULL;
1036 struct th_sweep *sweep = NULL;
1037 int pdu_last_seen = 0;
1039 struct sk_buff *skb;
1043 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1044 __func__, dev->name, smp_processor_id(), ch->id);
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;
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);
1058 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1059 skb_pull(pskb, TH_HEADER_LENGTH);
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(grp->fsm) == MPCG_STATE_FLOWC) ||
1064 ((fsm_getstate(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 *
1073 grp->out_of_sequence += 1;
1074 __skb_push(pskb, TH_HEADER_LENGTH);
1075 skb_queue_tail(&ch->io_queue, 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);
1082 grp->out_of_sequence = 0;
1083 ch->th_seq_num = header->th_seq_num;
1085 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1086 __func__, ch->th_seq_num);
1088 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1090 while ((pskb->len > 0) && !pdu_last_seen) {
1091 curr_pdu = (struct pdu *)pskb->data;
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);
1098 skb_pull(pskb, PDU_HEADER_LENGTH);
1100 if (curr_pdu->pdu_flag & PDU_LAST)
1102 if (curr_pdu->pdu_flag & PDU_CNTL)
1103 pskb->protocol = htons(ETH_P_SNAP);
1105 pskb->protocol = htons(ETH_P_SNA_DIX);
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 "
1111 CTCM_FUNTAIL, dev->name, pskb->len);
1113 priv->stats.rx_dropped++;
1114 priv->stats.rx_length_errors++;
1117 skb_reset_mac_header(pskb);
1118 new_len = curr_pdu->pdu_offset;
1119 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
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);
1130 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
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(grp->fsm, MPCG_EVENT_INOP, dev);
1140 skb_put_data(skb, pskb->data, new_len);
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, 4)) = ch->pdu_seq;
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((char *)skb->data, skb->len);
1161 sendrc = netif_rx(skb);
1162 priv->stats.rx_packets++;
1163 priv->stats.rx_bytes += skblen;
1164 skb_pull(pskb, new_len); /* point to next PDU */
1167 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1168 if (mpcginfo == NULL)
1172 mpcginfo->th = header;
1173 mpcginfo->skb = pskb;
1174 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
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(pskb, XID2_LENGTH);
1186 mpcginfo->xid = thisxid;
1187 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1188 } else if (header->th_blk_flag == TH_DISCONTACT)
1189 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, 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 */
1197 ctcmpc_dump_skb(pskb, -8);
1203 dev_kfree_skb_any(pskb);
1204 if (sendrc == NET_RX_DROP) {
1206 "The network backlog for %s is exceeded, "
1207 "package dropped\n", __func__);
1208 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1211 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1212 __func__, dev->name, ch, ch->id);
1216 * tasklet helper for mpc's skb unpacking.
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
1223 void ctcmpc_bh(unsigned long thischan)
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;
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(grp->fsm) != MPCG_STATE_FLOWC) &&
1235 (skb = skb_dequeue(&ch->io_queue))) {
1236 ctcmpc_unpack_skb(ch, 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(grp->fsm, MPCG_EVENT_INOP, dev);
1245 if (skb == skb_peek(&ch->io_queue))
1248 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1249 __func__, dev->name, ch, ch->id);
1254 * MPC Group Initializations
1256 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1258 struct mpc_group *grp;
1260 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1261 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1263 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1267 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1268 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1269 mpcg_fsm_len, GFP_KERNEL);
1270 if (grp->fsm == NULL) {
1275 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1276 fsm_settimer(grp->fsm, &grp->timer);
1279 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1280 if (grp->xid_skb == NULL) {
1281 kfree_fsm(grp->fsm);
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(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1290 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1291 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1292 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1293 grp->xid->xid2_sender_id = jiffies;
1295 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1296 skb_put_data(grp->xid_skb, "VTAM", 4);
1299 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1300 if (grp->rcvd_xid_skb == NULL) {
1301 kfree_fsm(grp->fsm);
1302 dev_kfree_skb(grp->xid_skb);
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(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1309 grp->saved_xid2 = NULL;
1310 priv->xid = grp->xid;
1316 * The MPC Group Station FSM
1320 * MPC Group Station FSM actions
1321 * CTCM_PROTO_MPC only
1325 * NOP action for statemachines
1327 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
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.
1337 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1339 struct net_device *dev = arg;
1340 struct ctcm_priv *priv;
1341 struct mpc_group *grp;
1342 struct channel *wch;
1344 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1346 priv = dev->ml_priv;
1348 grp->flow_off_called = 0;
1349 fsm_deltimer(&grp->timer);
1350 if (grp->channels_terminating)
1353 grp->channels_terminating = 1;
1354 grp->saved_state = fsm_getstate(grp->fsm);
1355 fsm_newstate(grp->fsm, 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(&priv->restart_timer);
1365 wch = priv->channel[CTCM_WRITE];
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:
1380 case MPCG_STATE_FLOWC:
1381 case MPCG_STATE_READY:
1383 tasklet_hi_schedule(&wch->ch_disc_tasklet);
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;
1393 grp->changed_side = 0;
1395 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1396 skb_reset_tail_pointer(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(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1401 if (grp->send_qllc_disc == 1) {
1402 grp->send_qllc_disc = 0;
1403 mpc_send_qllc_discontact(dev);
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(&priv->restart_timer);
1414 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1415 fsm_newstate(grp->fsm, 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);
1421 fsm_deltimer(&priv->restart_timer);
1422 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1423 fsm_newstate(grp->fsm, 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);
1431 * Handle mpc group action timeout.
1432 * MPC Group Station FSM action
1433 * CTCM_PROTO_MPC only
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.
1439 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1441 struct net_device *dev = arg;
1442 struct ctcm_priv *priv;
1443 struct mpc_group *grp;
1444 struct channel *wch;
1445 struct channel *rch;
1447 priv = dev->ml_priv;
1449 wch = priv->channel[CTCM_WRITE];
1450 rch = priv->channel[CTCM_READ];
1452 switch (fsm_getstate(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(rch->fsm) == CH_XID0_PENDING) &&
1458 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1462 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1465 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1467 CTCM_FUNTAIL, dev->name);
1472 * MPC Group Station FSM action
1473 * CTCM_PROTO_MPC only
1475 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
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;
1486 priv = dev->ml_priv;
1488 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1490 CTCM_FUNTAIL, dev->name, ch->id);
1492 grp->send_qllc_disc = 1;
1493 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1502 * MPC Group Station - not part of FSM
1503 * CTCM_PROTO_MPC only
1504 * called from add_channel in ctcm_main.c
1506 void mpc_action_send_discontact(unsigned long thischan)
1509 struct channel *ch = (struct channel *)thischan;
1510 unsigned long saveflags = 0;
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(get_ccwdev_lock(ch->cdev), saveflags);
1517 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1525 * helper function of mpc FSM
1526 * CTCM_PROTO_MPC only
1527 * mpc_action_rcvd_xid7
1529 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
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;
1539 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1541 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1545 /* XID REJECTED: xid == NULL */
1546 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1547 "%s(%s): xid = NULL",
1548 CTCM_FUNTAIL, ch->id);
1552 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
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) {
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);
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);
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;
1574 if (grp->saved_xid2 == NULL) {
1576 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1578 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1579 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1581 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1582 grp->rcvd_xid_skb->len = 0;
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) {
1594 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1595 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1596 CTCM_FUNTAIL, ch->id);
1599 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1600 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1601 CTCM_FUNTAIL, ch->id);
1605 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
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);
1612 if (xid->xid2_flag2 == 0x40) {
1614 /* XID REJECTED - xid NOGOOD */
1615 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1616 "%s(%s): xid NOGOOD",
1617 CTCM_FUNTAIL, ch->id);
1619 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
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);
1626 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
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);
1637 "The XID used in the MPC protocol is not valid, "
1639 priv->xid->xid2_flag2 = 0x40;
1640 grp->saved_xid2->xid2_flag2 = 0x40;
1647 * MPC Group Station FSM action
1648 * CTCM_PROTO_MPC only
1650 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1652 struct channel *ch = arg;
1655 unsigned long saveflags = 0; /* avoids compiler warning with
1656 spin_unlock_irqrestore */
1658 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1659 __func__, smp_processor_id(), ch, ch->id);
1661 if (ctcm_checkalloc_buffer(ch))
1665 * skb data-buffer referencing:
1667 ch->trans_skb->data = ch->trans_skb_data;
1668 skb_reset_tail_pointer(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
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(ch->trans_skb, TH_HEADER_LENGTH);
1678 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1679 /* check is main purpose here: */
1680 skb_put(ch->trans_skb, XID2_LENGTH);
1681 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1682 /* cleanup back to startpoint */
1683 ch->trans_skb->data = ch->trans_skb_data;
1684 skb_reset_tail_pointer(ch->trans_skb);
1685 ch->trans_skb->len = 0;
1687 /* non-checking rewrite of above skb data-buffer referencing: */
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;
1695 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1696 ch->ccw[8].count = 0;
1697 ch->ccw[8].cda = 0x00;
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);
1704 if (side == XSIDE) {
1705 /* mpc_action_xside_xid */
1706 if (ch->xid_th == NULL)
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);
1713 if (ch->xid == NULL)
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);
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);
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);
1730 ch->ccw[13].cmd_code = CCW_CMD_READ;
1731 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
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);
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);
1744 if (ch->xid_th == NULL)
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);
1751 if (ch->xid == NULL)
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);
1758 if (ch->xid_id == NULL)
1760 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1761 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1764 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1765 ch->ccw[13].count = 4;
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;
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);
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);
1785 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1786 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1788 if (gotlock) /* see remark above about conditional locking */
1789 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1792 ctcm_ccw_check_rc(ch, rc,
1793 (side == XSIDE) ? "x-side XID" : "y-side XID");
1797 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1798 __func__, ch, ch->id);
1804 * MPC Group Station FSM action
1805 * CTCM_PROTO_MPC only
1807 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1809 mpc_action_side_xid(fsm, arg, XSIDE);
1813 * MPC Group Station FSM action
1814 * CTCM_PROTO_MPC only
1816 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1818 mpc_action_side_xid(fsm, arg, YSIDE);
1822 * MPC Group Station FSM action
1823 * CTCM_PROTO_MPC only
1825 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
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;
1832 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1833 __func__, smp_processor_id(), ch, ch->id);
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);
1842 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1844 ch->xid->xid2_option = XID2_0;
1846 switch (fsm_getstate(grp->fsm)) {
1847 case MPCG_STATE_XID2INITW:
1848 case MPCG_STATE_XID2INITX:
1849 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1851 case MPCG_STATE_XID0IOWAIT:
1852 case MPCG_STATE_XID0IOWAIX:
1853 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1857 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1863 * MPC Group Station FSM action
1864 * CTCM_PROTO_MPC only
1866 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1868 struct net_device *dev = arg;
1869 struct ctcm_priv *priv = dev->ml_priv;
1870 struct mpc_group *grp = NULL;
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(ch->xid_skb);
1884 ch->xid_skb->len = 0;
1885 thisxid->xid2_option = XID2_7;
1889 if (grp->outstanding_xid7_p2 > 0) {
1890 if (grp->roll == YSIDE) {
1891 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1892 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1893 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1894 skb_put_data(ch->xid_skb, &thdummy,
1898 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1899 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1900 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1901 skb_put_data(ch->xid_skb, &thnorm,
1907 if (grp->roll == YSIDE) {
1908 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1909 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1910 skb_put_data(ch->xid_skb, &thnorm,
1912 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1915 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1916 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1917 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1918 skb_put_data(ch->xid_skb, &thdummy,
1925 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1932 * MPC Group Station FSM action
1933 * CTCM_PROTO_MPC only
1935 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
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;
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);
1948 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1949 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1951 grp->outstanding_xid2--;
1952 grp->outstanding_xid7++;
1953 grp->outstanding_xid7_p2++;
1955 /* must change state before validating xid to */
1956 /* properly handle interim interrupts received*/
1957 switch (fsm_getstate(grp->fsm)) {
1958 case MPCG_STATE_XID2INITW:
1959 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1960 mpc_validate_xid(mpcginfo);
1962 case MPCG_STATE_XID0IOWAIT:
1963 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1964 mpc_validate_xid(mpcginfo);
1966 case MPCG_STATE_XID2INITX:
1967 if (grp->outstanding_xid2 == 0) {
1968 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1969 mpc_validate_xid(mpcginfo);
1970 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1973 case MPCG_STATE_XID0IOWAIX:
1974 if (grp->outstanding_xid2 == 0) {
1975 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1976 mpc_validate_xid(mpcginfo);
1977 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
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",
1987 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1994 * MPC Group Station FSM action
1995 * CTCM_PROTO_MPC only
1997 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
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;
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);
2010 grp->outstanding_xid7--;
2011 ch->xid_skb->data = ch->xid_skb_data;
2012 skb_reset_tail_pointer(ch->xid_skb);
2013 ch->xid_skb->len = 0;
2015 switch (fsm_getstate(grp->fsm)) {
2016 case MPCG_STATE_XID7INITI:
2017 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2018 mpc_validate_xid(mpcginfo);
2020 case MPCG_STATE_XID7INITW:
2021 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2022 mpc_validate_xid(mpcginfo);
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;
2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2034 mpc_validate_xid(mpcginfo);
2035 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2038 mpc_validate_xid(mpcginfo);
2045 * mpc_action helper of an MPC Group Station FSM action
2046 * CTCM_PROTO_MPC only
2048 static int mpc_send_qllc_discontact(struct net_device *dev)
2050 struct sk_buff *skb;
2051 struct qllc *qllcptr;
2052 struct ctcm_priv *priv = dev->ml_priv;
2053 struct mpc_group *grp = priv->mpcg;
2055 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2056 __func__, mpcg_state_names[grp->saved_state]);
2058 switch (grp->saved_state) {
2060 * establish conn callback function is
2061 * preferred method to report failure
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;
2077 case MPCG_STATE_FLOWC:
2078 case MPCG_STATE_READY:
2079 grp->send_qllc_disc = 2;
2081 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
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++;
2090 qllcptr = skb_put(skb, sizeof(struct qllc));
2091 qllcptr->qllc_address = 0xcc;
2092 qllcptr->qllc_commands = 0x03;
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);
2102 *((__u32 *)skb_push(skb, 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);
2108 /* receipt of CC03 resets anticipated sequence number on
2110 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2111 skb_reset_mac_header(skb);
2113 skb->protocol = htons(ETH_P_SNAP);
2114 skb->ip_summed = CHECKSUM_UNNECESSARY;
2116 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2127 /* --- This is the END my friend --- */