2 * Copyright IBM Corp. 2004, 2007
3 * Authors: Belinda Thompson (belindat@us.ibm.com)
4 * Andy Richter (richtera@us.ibm.com)
5 * Peter Tiedemann (ptiedem@de.ibm.com)
9 This module exports functions to be used by CCS:
10 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
11 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
12 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
13 EXPORT_SYMBOL(ctc_mpc_flow_control);
20 #define KMSG_COMPONENT "ctcm"
21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/interrupt.h>
30 #include <linux/timer.h>
31 #include <linux/sched.h>
33 #include <linux/signal.h>
34 #include <linux/string.h>
35 #include <linux/proc_fs.h>
38 #include <linux/if_arp.h>
39 #include <linux/tcp.h>
40 #include <linux/skbuff.h>
41 #include <linux/ctype.h>
42 #include <linux/netdevice.h>
45 #include <linux/io.h> /* instead of <asm/io.h> ok ? */
46 #include <asm/ccwdev.h>
47 #include <asm/ccwgroup.h>
48 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */
49 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */
50 #include <linux/wait.h>
51 #include <linux/moduleparam.h>
52 #include <asm/idals.h>
54 #include "ctcm_main.h"
56 #include "ctcm_fsms.h"
58 static const struct xid2 init_xid = {
59 .xid2_type_id = XID_FM2,
71 .xid2_option = XID2_0,
74 .xid2_dlc_type = XID2_READ_SIDE,
78 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),
81 static const struct th_header thnorm = {
83 .th_ch_flag = TH_IS_XID,
84 .th_blk_flag = TH_DATA_IS_XID,
86 .th_seq_num = 0x00000000,
89 static const struct th_header thdummy = {
92 .th_blk_flag = TH_DATA_IS_XID,
94 .th_seq_num = 0x00000000,
98 * Definition of one MPC group
102 * Compatibility macros for busy handling
103 * of network devices.
106 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
109 * MPC Group state machine actions (static prototypes)
111 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
112 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
113 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
114 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
115 static int mpc_validate_xid(struct mpcg_info *mpcginfo);
116 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
117 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
118 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
119 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
120 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
121 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
124 /*-------------------------------------------------------------------*
125 * Dump buffer format *
127 *--------------------------------------------------------------------*/
128 void ctcmpc_dumpit(char *buf, int len)
130 __u32 ct, sw, rm, dup;
132 char tbuf[82], tdup[82];
135 char bhex[82], duphex[82];
144 for (ct = 0; ct < len; ct++, ptr++, rptr++) {
146 sprintf(addr, "%16.16llx", (__u64)rptr);
148 sprintf(boff, "%4.4X", (__u32)ct);
152 if ((sw == 4) || (sw == 12))
157 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
161 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
171 if ((strcmp(duphex, bhex)) != 0) {
174 "Duplicate as above to %s", addr);
175 ctcm_pr_debug(" --- %s ---\n",
178 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
179 addr, boff, bhex, basc);
181 strcpy(duphex, bhex);
190 for ( ; rm > 0; rm--, sw++) {
191 if ((sw == 4) || (sw == 12))
199 sprintf(tdup, "Duplicate as above to %s", addr);
200 ctcm_pr_debug(" --- %s ---\n", tdup);
202 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
203 addr, boff, bhex, basc);
206 sprintf(tdup, "Duplicate as above to %s", addr);
207 ctcm_pr_debug(" --- %s ---\n", tdup);
210 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
211 addr, boff, bhex, basc);
217 } /* end of ctcmpc_dumpit */
222 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
224 * skb The sk_buff to dump.
225 * offset Offset relative to skb-data, where to start the dump.
227 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
230 struct th_header *header;
239 header = (struct th_header *)p;
241 ctcm_pr_debug("dump:\n");
242 ctcm_pr_debug("skb len=%d \n", skb->len);
244 switch (header->th_ch_flag) {
249 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
250 (header->th_is_xid == 0x01))
260 pheader = (struct pdu *)p;
261 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
262 pheader->pdu_offset, pheader->pdu_offset);
263 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
264 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
265 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
269 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
270 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
271 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
272 ctcm_pr_debug("th->type : %s\n",
273 (header->th_is_xid) ? "DATA" : "XID");
274 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
280 ctcm_pr_debug("data: ");
281 for (i = 0; i < bl; i++)
282 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
287 static struct net_device *ctcmpc_get_dev(int port_num)
290 struct net_device *dev;
291 struct ctcm_priv *priv;
293 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
295 dev = __dev_get_by_name(&init_net, device);
298 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
299 "%s: Device not found by name: %s",
300 CTCM_FUNTAIL, device);
305 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
306 "%s(%s): dev->ml_priv is NULL",
307 CTCM_FUNTAIL, device);
310 if (priv->mpcg == NULL) {
311 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
312 "%s(%s): priv->mpcg is NULL",
313 CTCM_FUNTAIL, device);
320 * ctc_mpc_alloc_channel
321 * (exported interface)
323 * Device Initialization :
324 * ACTPATH driven IO operations
326 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
328 struct net_device *dev;
329 struct mpc_group *grp;
330 struct ctcm_priv *priv;
332 dev = ctcmpc_get_dev(port_num);
338 grp->allochanfunc = callback;
339 grp->port_num = port_num;
340 grp->port_persist = 1;
342 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
344 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
346 switch (fsm_getstate(grp->fsm)) {
347 case MPCG_STATE_INOP:
348 /* Group is in the process of terminating */
349 grp->alloc_called = 1;
351 case MPCG_STATE_RESET:
352 /* MPC Group will transition to state */
353 /* MPCG_STATE_XID2INITW iff the minimum number */
354 /* of 1 read and 1 write channel have successfully*/
356 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
358 grp->send_qllc_disc = 1;
359 case MPCG_STATE_XID0IOWAIT:
360 fsm_deltimer(&grp->timer);
361 grp->outstanding_xid2 = 0;
362 grp->outstanding_xid7 = 0;
363 grp->outstanding_xid7_p2 = 0;
364 grp->saved_xid2 = NULL;
367 fsm_event(priv->fsm, DEV_EVENT_START, dev);
369 case MPCG_STATE_READY:
370 /* XID exchanges completed after PORT was activated */
371 /* Link station already active */
372 /* Maybe timing issue...retry callback */
373 grp->allocchan_callback_retries++;
374 if (grp->allocchan_callback_retries < 4) {
375 if (grp->allochanfunc)
376 grp->allochanfunc(grp->port_num,
377 grp->group_max_buflen);
379 /* there are problems...bail out */
380 /* there may be a state mismatch so restart */
381 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
382 grp->allocchan_callback_retries = 0;
389 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
392 * ctc_mpc_establish_connectivity
393 * (exported interface)
395 void ctc_mpc_establish_connectivity(int port_num,
396 void (*callback)(int, int, int))
398 struct net_device *dev;
399 struct mpc_group *grp;
400 struct ctcm_priv *priv;
401 struct channel *rch, *wch;
403 dev = ctcmpc_get_dev(port_num);
408 rch = priv->channel[CTCM_READ];
409 wch = priv->channel[CTCM_WRITE];
411 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
413 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
415 grp->estconnfunc = callback;
416 grp->port_num = port_num;
418 switch (fsm_getstate(grp->fsm)) {
419 case MPCG_STATE_READY:
420 /* XID exchanges completed after PORT was activated */
421 /* Link station already active */
422 /* Maybe timing issue...retry callback */
423 fsm_deltimer(&grp->timer);
424 grp->estconn_callback_retries++;
425 if (grp->estconn_callback_retries < 4) {
426 if (grp->estconnfunc) {
427 grp->estconnfunc(grp->port_num, 0,
428 grp->group_max_buflen);
429 grp->estconnfunc = NULL;
432 /* there are problems...bail out */
433 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
434 grp->estconn_callback_retries = 0;
437 case MPCG_STATE_INOP:
438 case MPCG_STATE_RESET:
439 /* MPC Group is not ready to start XID - min num of */
440 /* 1 read and 1 write channel have not been acquired*/
442 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
443 "%s(%s): REJECTED - inactive channels",
444 CTCM_FUNTAIL, dev->name);
445 if (grp->estconnfunc) {
446 grp->estconnfunc(grp->port_num, -1, 0);
447 grp->estconnfunc = NULL;
450 case MPCG_STATE_XID2INITW:
451 /* alloc channel was called but no XID exchange */
452 /* has occurred. initiate xside XID exchange */
453 /* make sure yside XID0 processing has not started */
455 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
456 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
457 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
458 "%s(%s): ABORT - PASSIVE XID",
459 CTCM_FUNTAIL, dev->name);
462 grp->send_qllc_disc = 1;
463 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
464 fsm_deltimer(&grp->timer);
465 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
466 MPCG_EVENT_TIMER, dev);
467 grp->outstanding_xid7 = 0;
468 grp->outstanding_xid7_p2 = 0;
469 grp->saved_xid2 = NULL;
470 if ((rch->in_mpcgroup) &&
471 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
472 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
474 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
475 "%s(%s): RX-%s not ready for ACTIVE XID0",
476 CTCM_FUNTAIL, dev->name, rch->id);
477 if (grp->estconnfunc) {
478 grp->estconnfunc(grp->port_num, -1, 0);
479 grp->estconnfunc = NULL;
481 fsm_deltimer(&grp->timer);
484 if ((wch->in_mpcgroup) &&
485 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
486 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
488 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
489 "%s(%s): WX-%s not ready for ACTIVE XID0",
490 CTCM_FUNTAIL, dev->name, wch->id);
491 if (grp->estconnfunc) {
492 grp->estconnfunc(grp->port_num, -1, 0);
493 grp->estconnfunc = NULL;
495 fsm_deltimer(&grp->timer);
499 case MPCG_STATE_XID0IOWAIT:
500 /* already in active XID negotiations */
506 CTCM_PR_DEBUG("Exit %s()\n", __func__);
509 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
513 * (exported interface)
515 void ctc_mpc_dealloc_ch(int port_num)
517 struct net_device *dev;
518 struct ctcm_priv *priv;
519 struct mpc_group *grp;
521 dev = ctcmpc_get_dev(port_num);
527 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
528 "%s: %s: refcount = %d\n",
529 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
531 fsm_deltimer(&priv->restart_timer);
532 grp->channels_terminating = 0;
533 fsm_deltimer(&grp->timer);
534 grp->allochanfunc = NULL;
535 grp->estconnfunc = NULL;
536 grp->port_persist = 0;
537 grp->send_qllc_disc = 0;
538 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
543 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
546 * ctc_mpc_flow_control
547 * (exported interface)
549 void ctc_mpc_flow_control(int port_num, int flowc)
551 struct ctcm_priv *priv;
552 struct mpc_group *grp;
553 struct net_device *dev;
557 dev = ctcmpc_get_dev(port_num);
563 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
564 "%s: %s: flowc = %d",
565 CTCM_FUNTAIL, dev->name, flowc);
567 rch = priv->channel[CTCM_READ];
569 mpcg_state = fsm_getstate(grp->fsm);
572 if (mpcg_state == MPCG_STATE_FLOWC)
574 if (mpcg_state == MPCG_STATE_READY) {
575 if (grp->flow_off_called == 1)
576 grp->flow_off_called = 0;
578 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
583 if (mpcg_state == MPCG_STATE_FLOWC) {
584 fsm_newstate(grp->fsm, MPCG_STATE_READY);
585 /* ensure any data that has accumulated */
586 /* on the io_queue will now be sen t */
587 tasklet_schedule(&rch->ch_tasklet);
589 /* possible race condition */
590 if (mpcg_state == MPCG_STATE_READY) {
591 grp->flow_off_called = 1;
598 EXPORT_SYMBOL(ctc_mpc_flow_control);
600 static int mpc_send_qllc_discontact(struct net_device *);
603 * helper function of ctcmpc_unpack_skb
605 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
607 struct channel *rch = mpcginfo->ch;
608 struct net_device *dev = rch->netdev;
609 struct ctcm_priv *priv = dev->ml_priv;
610 struct mpc_group *grp = priv->mpcg;
611 struct channel *ch = priv->channel[CTCM_WRITE];
613 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
614 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
616 grp->sweep_rsp_pend_num--;
618 if ((grp->sweep_req_pend_num == 0) &&
619 (grp->sweep_rsp_pend_num == 0)) {
620 fsm_deltimer(&ch->sweep_timer);
622 rch->th_seq_num = 0x00;
623 ch->th_seq_num = 0x00;
624 ctcm_clear_busy_do(dev);
632 * helper function of mpc_rcvd_sweep_req
633 * which is a helper of ctcmpc_unpack_skb
635 static void ctcmpc_send_sweep_resp(struct channel *rch)
637 struct net_device *dev = rch->netdev;
638 struct ctcm_priv *priv = dev->ml_priv;
639 struct mpc_group *grp = priv->mpcg;
640 struct th_sweep *header;
641 struct sk_buff *sweep_skb;
642 struct channel *ch = priv->channel[CTCM_WRITE];
644 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
646 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
647 if (sweep_skb == NULL) {
648 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
649 "%s(%s): sweep_skb allocation ERROR\n",
650 CTCM_FUNTAIL, rch->id);
654 header = kmalloc(sizeof(struct th_sweep), gfp_type());
657 dev_kfree_skb_any(sweep_skb);
661 header->th.th_seg = 0x00 ;
662 header->th.th_ch_flag = TH_SWEEP_RESP;
663 header->th.th_blk_flag = 0x00;
664 header->th.th_is_xid = 0x00;
665 header->th.th_seq_num = 0x00;
666 header->sw.th_last_seq = ch->th_seq_num;
668 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
672 netif_trans_update(dev);
673 skb_queue_tail(&ch->sweep_queue, sweep_skb);
675 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
681 ctcm_clear_busy_do(dev);
682 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
688 * helper function of ctcmpc_unpack_skb
690 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
692 struct channel *rch = mpcginfo->ch;
693 struct net_device *dev = rch->netdev;
694 struct ctcm_priv *priv = dev->ml_priv;
695 struct mpc_group *grp = priv->mpcg;
696 struct channel *ch = priv->channel[CTCM_WRITE];
699 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
700 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
702 if (grp->in_sweep == 0) {
704 ctcm_test_and_set_busy(dev);
705 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
706 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
709 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
711 grp->sweep_req_pend_num--;
712 ctcmpc_send_sweep_resp(ch);
718 * MPC Group Station FSM definitions
720 static const char *mpcg_event_names[] = {
721 [MPCG_EVENT_INOP] = "INOP Condition",
722 [MPCG_EVENT_DISCONC] = "Discontact Received",
723 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
724 [MPCG_EVENT_XID2] = "XID2 Received",
725 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
726 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
727 [MPCG_EVENT_TIMER] = "XID Setup Timer",
728 [MPCG_EVENT_DOIO] = "XID DoIO",
731 static const char *mpcg_state_names[] = {
732 [MPCG_STATE_RESET] = "Reset",
733 [MPCG_STATE_INOP] = "INOP",
734 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
735 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
736 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
737 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
738 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
739 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
740 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
741 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
742 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
743 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
744 [MPCG_STATE_READY] = "READY",
748 * The MPC Group Station FSM
751 static const fsm_node mpcg_fsm[] = {
752 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
753 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
754 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
756 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
757 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
759 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
760 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
761 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
762 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
763 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
765 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
766 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
767 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
768 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
769 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
771 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
772 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
773 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
774 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
775 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
776 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
777 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
779 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
780 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
781 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
782 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
783 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
784 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
786 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
787 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
788 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
793 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
794 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
795 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
800 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
801 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
802 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
803 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
804 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
805 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
806 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
808 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
809 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
810 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
815 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
816 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
819 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
822 * MPC Group Station FSM action
823 * CTCM_PROTO_MPC only
825 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
827 struct net_device *dev = arg;
828 struct ctcm_priv *priv = dev->ml_priv;
829 struct mpc_group *grp = priv->mpcg;
832 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
833 "%s(%s): No MPC group",
834 CTCM_FUNTAIL, dev->name);
838 fsm_deltimer(&grp->timer);
840 if (grp->saved_xid2->xid2_flag2 == 0x40) {
841 priv->xid->xid2_flag2 = 0x00;
842 if (grp->estconnfunc) {
843 grp->estconnfunc(grp->port_num, 1,
844 grp->group_max_buflen);
845 grp->estconnfunc = NULL;
846 } else if (grp->allochanfunc)
847 grp->send_qllc_disc = 1;
849 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
850 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
852 CTCM_FUNTAIL, dev->name);
856 grp->port_persist = 1;
857 grp->out_of_sequence = 0;
858 grp->estconn_called = 0;
860 tasklet_hi_schedule(&grp->mpc_tasklet2);
866 * helper of ctcm_init_netdevice
867 * CTCM_PROTO_MPC only
869 void mpc_group_ready(unsigned long adev)
871 struct net_device *dev = (struct net_device *)adev;
872 struct ctcm_priv *priv = dev->ml_priv;
873 struct mpc_group *grp = priv->mpcg;
874 struct channel *ch = NULL;
877 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
878 "%s(%s): No MPC group",
879 CTCM_FUNTAIL, dev->name);
883 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
884 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
885 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
887 fsm_newstate(grp->fsm, MPCG_STATE_READY);
889 /* Put up a read on the channel */
890 ch = priv->channel[CTCM_READ];
892 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
893 __func__, ch->pdu_seq);
895 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
896 /* Put the write channel in idle state */
897 ch = priv->channel[CTCM_WRITE];
898 if (ch->collect_len > 0) {
899 spin_lock(&ch->collect_lock);
900 ctcm_purge_skb_queue(&ch->collect_queue);
902 spin_unlock(&ch->collect_lock);
904 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
905 ctcm_clear_busy(dev);
907 if (grp->estconnfunc) {
908 grp->estconnfunc(grp->port_num, 0,
909 grp->group_max_buflen);
910 grp->estconnfunc = NULL;
911 } else if (grp->allochanfunc)
912 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
914 grp->send_qllc_disc = 1;
915 grp->changed_side = 0;
922 * Increment the MPC Group Active Channel Counts
923 * helper of dev_action (called from channel fsm)
925 void mpc_channel_action(struct channel *ch, int direction, int action)
927 struct net_device *dev = ch->netdev;
928 struct ctcm_priv *priv = dev->ml_priv;
929 struct mpc_group *grp = priv->mpcg;
932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933 "%s(%s): No MPC group",
934 CTCM_FUNTAIL, dev->name);
938 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
940 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
941 "%s: %i / Grp:%s total_channels=%i, active_channels: "
942 "read=%i, write=%i\n", __func__, action,
943 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
944 grp->active_channels[CTCM_READ],
945 grp->active_channels[CTCM_WRITE]);
947 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
948 grp->num_channel_paths++;
949 grp->active_channels[direction]++;
950 grp->outstanding_xid2++;
953 if (ch->xid_skb != NULL)
954 dev_kfree_skb_any(ch->xid_skb);
956 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
957 GFP_ATOMIC | GFP_DMA);
958 if (ch->xid_skb == NULL) {
959 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
960 "%s(%s): Couldn't alloc ch xid_skb\n",
961 CTCM_FUNTAIL, dev->name);
962 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
965 ch->xid_skb_data = ch->xid_skb->data;
966 ch->xid_th = (struct th_header *)ch->xid_skb->data;
967 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
968 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
969 skb_put(ch->xid_skb, XID2_LENGTH);
970 ch->xid_id = skb_tail_pointer(ch->xid_skb);
971 ch->xid_skb->data = ch->xid_skb_data;
972 skb_reset_tail_pointer(ch->xid_skb);
973 ch->xid_skb->len = 0;
975 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
979 ch->xid->xid2_dlc_type =
980 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
981 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
983 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
984 ch->xid->xid2_buf_len = 0x00;
986 ch->xid_skb->data = ch->xid_skb_data;
987 skb_reset_tail_pointer(ch->xid_skb);
988 ch->xid_skb->len = 0;
990 fsm_newstate(ch->fsm, CH_XID0_PENDING);
992 if ((grp->active_channels[CTCM_READ] > 0) &&
993 (grp->active_channels[CTCM_WRITE] > 0) &&
994 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
995 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
996 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
997 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
998 __func__, dev->name);
1000 } else if ((action == MPC_CHANNEL_REMOVE) &&
1001 (ch->in_mpcgroup == 1)) {
1002 ch->in_mpcgroup = 0;
1003 grp->num_channel_paths--;
1004 grp->active_channels[direction]--;
1006 if (ch->xid_skb != NULL)
1007 dev_kfree_skb_any(ch->xid_skb);
1010 if (grp->channels_terminating)
1013 if (((grp->active_channels[CTCM_READ] == 0) &&
1014 (grp->active_channels[CTCM_WRITE] > 0))
1015 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1016 (grp->active_channels[CTCM_READ] > 0)))
1017 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1020 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1021 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1022 "read=%i, write=%i\n", __func__, action,
1023 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1024 grp->active_channels[CTCM_READ],
1025 grp->active_channels[CTCM_WRITE]);
1027 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1031 * Unpack a just received skb and hand it over to
1033 * special MPC version of unpack_skb.
1035 * ch The channel where this skb has been received.
1036 * pskb The received skb.
1038 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1040 struct net_device *dev = ch->netdev;
1041 struct ctcm_priv *priv = dev->ml_priv;
1042 struct mpc_group *grp = priv->mpcg;
1043 struct pdu *curr_pdu;
1044 struct mpcg_info *mpcginfo;
1045 struct th_header *header = NULL;
1046 struct th_sweep *sweep = NULL;
1047 int pdu_last_seen = 0;
1049 struct sk_buff *skb;
1053 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1054 __func__, dev->name, smp_processor_id(), ch->id);
1056 header = (struct th_header *)pskb->data;
1057 if ((header->th_seg == 0) &&
1058 (header->th_ch_flag == 0) &&
1059 (header->th_blk_flag == 0) &&
1060 (header->th_seq_num == 0))
1061 /* nothing for us */ goto done;
1063 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1064 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1065 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1068 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1069 skb_pull(pskb, TH_HEADER_LENGTH);
1071 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1072 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1073 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1074 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1075 (header->th_seq_num != ch->th_seq_num + 1) &&
1076 (ch->th_seq_num != 0))) {
1077 /* This is NOT the next segment *
1078 * we are not the correct race winner *
1079 * go away and let someone else win *
1080 * BUT..this only applies if xid negot *
1083 grp->out_of_sequence += 1;
1084 __skb_push(pskb, TH_HEADER_LENGTH);
1085 skb_queue_tail(&ch->io_queue, pskb);
1086 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1087 "got:%08x\n", __func__,
1088 ch->th_seq_num + 1, header->th_seq_num);
1092 grp->out_of_sequence = 0;
1093 ch->th_seq_num = header->th_seq_num;
1095 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1096 __func__, ch->th_seq_num);
1098 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1100 while ((pskb->len > 0) && !pdu_last_seen) {
1101 curr_pdu = (struct pdu *)pskb->data;
1103 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1104 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1105 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1106 __func__, pskb->len);
1108 skb_pull(pskb, PDU_HEADER_LENGTH);
1110 if (curr_pdu->pdu_flag & PDU_LAST)
1112 if (curr_pdu->pdu_flag & PDU_CNTL)
1113 pskb->protocol = htons(ETH_P_SNAP);
1115 pskb->protocol = htons(ETH_P_SNA_DIX);
1117 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1118 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1119 "%s(%s): Dropping packet with "
1121 CTCM_FUNTAIL, dev->name, pskb->len);
1123 priv->stats.rx_dropped++;
1124 priv->stats.rx_length_errors++;
1127 skb_reset_mac_header(pskb);
1128 new_len = curr_pdu->pdu_offset;
1129 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1131 if ((new_len == 0) || (new_len > pskb->len)) {
1132 /* should never happen */
1133 /* pskb len must be hosed...bail out */
1134 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1135 "%s(%s): non valid pdu_offset: %04x",
1136 /* "data may be lost", */
1137 CTCM_FUNTAIL, dev->name, new_len);
1140 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1143 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1144 "%s(%s): MEMORY allocation error",
1145 CTCM_FUNTAIL, dev->name);
1146 priv->stats.rx_dropped++;
1147 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1150 memcpy(skb_put(skb, new_len), pskb->data, new_len);
1152 skb_reset_mac_header(skb);
1153 skb->dev = pskb->dev;
1154 skb->protocol = pskb->protocol;
1155 skb->ip_summed = CHECKSUM_UNNECESSARY;
1156 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1159 if (do_debug_data) {
1160 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1161 __func__, ch->pdu_seq);
1162 ctcm_pr_debug("%s: skb:%0lx "
1163 "skb len: %d \n", __func__,
1164 (unsigned long)skb, skb->len);
1165 ctcm_pr_debug("%s: up to 32 bytes "
1166 "of pdu_data sent\n", __func__);
1167 ctcmpc_dump32((char *)skb->data, skb->len);
1171 sendrc = netif_rx(skb);
1172 priv->stats.rx_packets++;
1173 priv->stats.rx_bytes += skblen;
1174 skb_pull(pskb, new_len); /* point to next PDU */
1177 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1178 if (mpcginfo == NULL)
1182 mpcginfo->th = header;
1183 mpcginfo->skb = pskb;
1184 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1187 sweep = (struct th_sweep *)pskb->data;
1188 mpcginfo->sweep = sweep;
1189 if (header->th_ch_flag == TH_SWEEP_REQ)
1190 mpc_rcvd_sweep_req(mpcginfo);
1191 else if (header->th_ch_flag == TH_SWEEP_RESP)
1192 mpc_rcvd_sweep_resp(mpcginfo);
1193 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1194 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1195 skb_pull(pskb, XID2_LENGTH);
1196 mpcginfo->xid = thisxid;
1197 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1198 } else if (header->th_blk_flag == TH_DISCONTACT)
1199 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1200 else if (header->th_seq_num != 0) {
1201 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1202 "%s(%s): control pkt expected\n",
1203 CTCM_FUNTAIL, dev->name);
1204 priv->stats.rx_dropped++;
1205 /* mpcginfo only used for non-data transfers */
1207 ctcmpc_dump_skb(pskb, -8);
1213 dev_kfree_skb_any(pskb);
1214 if (sendrc == NET_RX_DROP) {
1216 "The network backlog for %s is exceeded, "
1217 "package dropped\n", __func__);
1218 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1221 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1222 __func__, dev->name, ch, ch->id);
1226 * tasklet helper for mpc's skb unpacking.
1228 * ch The channel to work on.
1229 * Allow flow control back pressure to occur here.
1230 * Throttling back channel can result in excessive
1231 * channel inactivity and system deact of channel
1233 void ctcmpc_bh(unsigned long thischan)
1235 struct channel *ch = (struct channel *)thischan;
1236 struct sk_buff *skb;
1237 struct net_device *dev = ch->netdev;
1238 struct ctcm_priv *priv = dev->ml_priv;
1239 struct mpc_group *grp = priv->mpcg;
1241 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1242 dev->name, smp_processor_id(), __func__, ch->id);
1243 /* caller has requested driver to throttle back */
1244 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1245 (skb = skb_dequeue(&ch->io_queue))) {
1246 ctcmpc_unpack_skb(ch, skb);
1247 if (grp->out_of_sequence > 20) {
1248 /* assume data loss has occurred if */
1249 /* missing seq_num for extended */
1250 /* period of time */
1251 grp->out_of_sequence = 0;
1252 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1255 if (skb == skb_peek(&ch->io_queue))
1258 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1259 __func__, dev->name, ch, ch->id);
1264 * MPC Group Initializations
1266 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1268 struct mpc_group *grp;
1270 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1271 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1273 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1277 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1278 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1279 mpcg_fsm_len, GFP_KERNEL);
1280 if (grp->fsm == NULL) {
1285 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1286 fsm_settimer(grp->fsm, &grp->timer);
1289 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1290 if (grp->xid_skb == NULL) {
1291 kfree_fsm(grp->fsm);
1295 /* base xid for all channels in group */
1296 grp->xid_skb_data = grp->xid_skb->data;
1297 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1298 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1299 &thnorm, TH_HEADER_LENGTH);
1301 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1302 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1303 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1304 grp->xid->xid2_sender_id = jiffies;
1306 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1307 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1310 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1311 if (grp->rcvd_xid_skb == NULL) {
1312 kfree_fsm(grp->fsm);
1313 dev_kfree_skb(grp->xid_skb);
1317 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1318 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1319 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1320 &thnorm, TH_HEADER_LENGTH);
1321 grp->saved_xid2 = NULL;
1322 priv->xid = grp->xid;
1328 * The MPC Group Station FSM
1332 * MPC Group Station FSM actions
1333 * CTCM_PROTO_MPC only
1337 * NOP action for statemachines
1339 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1344 * invoked when the device transitions to dev_stopped
1345 * MPC will stop each individual channel if a single XID failure
1346 * occurs, or will intitiate all channels be stopped if a GROUP
1347 * level failure occurs.
1349 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1351 struct net_device *dev = arg;
1352 struct ctcm_priv *priv;
1353 struct mpc_group *grp;
1354 struct channel *wch;
1356 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1358 priv = dev->ml_priv;
1360 grp->flow_off_called = 0;
1361 fsm_deltimer(&grp->timer);
1362 if (grp->channels_terminating)
1365 grp->channels_terminating = 1;
1366 grp->saved_state = fsm_getstate(grp->fsm);
1367 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1368 if (grp->saved_state > MPCG_STATE_XID7INITF)
1369 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1370 "%s(%s): MPC GROUP INOPERATIVE",
1371 CTCM_FUNTAIL, dev->name);
1372 if ((grp->saved_state != MPCG_STATE_RESET) ||
1373 /* dealloc_channel has been called */
1374 (grp->port_persist == 0))
1375 fsm_deltimer(&priv->restart_timer);
1377 wch = priv->channel[CTCM_WRITE];
1379 switch (grp->saved_state) {
1380 case MPCG_STATE_RESET:
1381 case MPCG_STATE_INOP:
1382 case MPCG_STATE_XID2INITW:
1383 case MPCG_STATE_XID0IOWAIT:
1384 case MPCG_STATE_XID2INITX:
1385 case MPCG_STATE_XID7INITW:
1386 case MPCG_STATE_XID7INITX:
1387 case MPCG_STATE_XID0IOWAIX:
1388 case MPCG_STATE_XID7INITI:
1389 case MPCG_STATE_XID7INITZ:
1390 case MPCG_STATE_XID7INITF:
1392 case MPCG_STATE_FLOWC:
1393 case MPCG_STATE_READY:
1395 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1398 grp->xid2_tgnum = 0;
1399 grp->group_max_buflen = 0; /*min of all received */
1400 grp->outstanding_xid2 = 0;
1401 grp->outstanding_xid7 = 0;
1402 grp->outstanding_xid7_p2 = 0;
1403 grp->saved_xid2 = NULL;
1405 grp->changed_side = 0;
1407 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1408 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1409 grp->rcvd_xid_skb->len = 0;
1410 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1411 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1414 if (grp->send_qllc_disc == 1) {
1415 grp->send_qllc_disc = 0;
1416 mpc_send_qllc_discontact(dev);
1419 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1420 /* This can result in INOP of VTAM PU due to halting of */
1421 /* outstanding IO which causes a sense to be returned */
1422 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1423 /* become unreachable without manual intervention */
1424 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1425 grp->alloc_called = 0;
1426 fsm_deltimer(&priv->restart_timer);
1427 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1428 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1429 if (grp->saved_state > MPCG_STATE_XID7INITF)
1430 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1431 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1432 CTCM_FUNTAIL, dev->name);
1434 fsm_deltimer(&priv->restart_timer);
1435 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1436 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1437 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1438 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1439 CTCM_FUNTAIL, dev->name);
1444 * Handle mpc group action timeout.
1445 * MPC Group Station FSM action
1446 * CTCM_PROTO_MPC only
1448 * fi An instance of an mpc_group fsm.
1449 * event The event, just happened.
1450 * arg Generic pointer, casted from net_device * upon call.
1452 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1454 struct net_device *dev = arg;
1455 struct ctcm_priv *priv;
1456 struct mpc_group *grp;
1457 struct channel *wch;
1458 struct channel *rch;
1460 priv = dev->ml_priv;
1462 wch = priv->channel[CTCM_WRITE];
1463 rch = priv->channel[CTCM_READ];
1465 switch (fsm_getstate(grp->fsm)) {
1466 case MPCG_STATE_XID2INITW:
1467 /* Unless there is outstanding IO on the */
1468 /* channel just return and wait for ATTN */
1469 /* interrupt to begin XID negotiations */
1470 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1471 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1474 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1477 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1479 CTCM_FUNTAIL, dev->name);
1484 * MPC Group Station FSM action
1485 * CTCM_PROTO_MPC only
1487 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1489 struct mpcg_info *mpcginfo = arg;
1490 struct channel *ch = mpcginfo->ch;
1491 struct net_device *dev;
1492 struct ctcm_priv *priv;
1493 struct mpc_group *grp;
1498 priv = dev->ml_priv;
1500 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1502 CTCM_FUNTAIL, dev->name, ch->id);
1504 grp->send_qllc_disc = 1;
1505 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1514 * MPC Group Station - not part of FSM
1515 * CTCM_PROTO_MPC only
1516 * called from add_channel in ctcm_main.c
1518 void mpc_action_send_discontact(unsigned long thischan)
1521 struct channel *ch = (struct channel *)thischan;
1522 unsigned long saveflags = 0;
1524 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1525 rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1526 (unsigned long)ch, 0xff, 0);
1527 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1530 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1538 * helper function of mpc FSM
1539 * CTCM_PROTO_MPC only
1540 * mpc_action_rcvd_xid7
1542 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1544 struct channel *ch = mpcginfo->ch;
1545 struct net_device *dev = ch->netdev;
1546 struct ctcm_priv *priv = dev->ml_priv;
1547 struct mpc_group *grp = priv->mpcg;
1548 struct xid2 *xid = mpcginfo->xid;
1552 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1554 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1558 /* XID REJECTED: xid == NULL */
1559 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1560 "%s(%s): xid = NULL",
1561 CTCM_FUNTAIL, ch->id);
1565 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1567 /*the received direction should be the opposite of ours */
1568 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1569 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1571 /* XID REJECTED: r/w channel pairing mismatch */
1572 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1573 "%s(%s): r/w channel pairing mismatch",
1574 CTCM_FUNTAIL, ch->id);
1578 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1579 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1580 grp->group_max_buflen, xid->xid2_buf_len);
1582 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1583 xid->xid2_buf_len - len)
1584 grp->group_max_buflen = xid->xid2_buf_len - len;
1587 if (grp->saved_xid2 == NULL) {
1589 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1591 memcpy(skb_put(grp->rcvd_xid_skb,
1592 XID2_LENGTH), xid, XID2_LENGTH);
1593 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1595 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1596 grp->rcvd_xid_skb->len = 0;
1598 /* convert two 32 bit numbers into 1 64 bit for id compare */
1599 our_id = (__u64)priv->xid->xid2_adj_id;
1600 our_id = our_id << 32;
1601 our_id = our_id + priv->xid->xid2_sender_id;
1602 their_id = (__u64)xid->xid2_adj_id;
1603 their_id = their_id << 32;
1604 their_id = their_id + xid->xid2_sender_id;
1605 /* lower id assume the xside role */
1606 if (our_id < their_id) {
1608 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1609 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1610 CTCM_FUNTAIL, ch->id);
1613 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1614 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1615 CTCM_FUNTAIL, ch->id);
1619 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1621 /* XID REJECTED: xid flag byte4 mismatch */
1622 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1623 "%s(%s): xid flag byte4 mismatch",
1624 CTCM_FUNTAIL, ch->id);
1626 if (xid->xid2_flag2 == 0x40) {
1628 /* XID REJECTED - xid NOGOOD */
1629 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1630 "%s(%s): xid NOGOOD",
1631 CTCM_FUNTAIL, ch->id);
1633 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1635 /* XID REJECTED - Adjacent Station ID Mismatch */
1636 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1637 "%s(%s): Adjacent Station ID Mismatch",
1638 CTCM_FUNTAIL, ch->id);
1640 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1642 /* XID REJECTED - Sender Address Mismatch */
1643 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1644 "%s(%s): Sender Address Mismatch",
1645 CTCM_FUNTAIL, ch->id);
1651 "The XID used in the MPC protocol is not valid, "
1653 priv->xid->xid2_flag2 = 0x40;
1654 grp->saved_xid2->xid2_flag2 = 0x40;
1661 * MPC Group Station FSM action
1662 * CTCM_PROTO_MPC only
1664 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1666 struct channel *ch = arg;
1669 unsigned long saveflags = 0; /* avoids compiler warning with
1670 spin_unlock_irqrestore */
1672 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1673 __func__, smp_processor_id(), ch, ch->id);
1675 if (ctcm_checkalloc_buffer(ch))
1679 * skb data-buffer referencing:
1681 ch->trans_skb->data = ch->trans_skb_data;
1682 skb_reset_tail_pointer(ch->trans_skb);
1683 ch->trans_skb->len = 0;
1684 /* result of the previous 3 statements is NOT always
1685 * already set after ctcm_checkalloc_buffer
1686 * because of possible reuse of the trans_skb
1688 memset(ch->trans_skb->data, 0, 16);
1689 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1690 /* check is main purpose here: */
1691 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1692 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1693 /* check is main purpose here: */
1694 skb_put(ch->trans_skb, XID2_LENGTH);
1695 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1696 /* cleanup back to startpoint */
1697 ch->trans_skb->data = ch->trans_skb_data;
1698 skb_reset_tail_pointer(ch->trans_skb);
1699 ch->trans_skb->len = 0;
1701 /* non-checking rewrite of above skb data-buffer referencing: */
1703 memset(ch->trans_skb->data, 0, 16);
1704 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1705 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1706 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1709 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1710 ch->ccw[8].count = 0;
1711 ch->ccw[8].cda = 0x00;
1713 if (!(ch->xid_th && ch->xid && ch->xid_id))
1714 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1715 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1716 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1718 if (side == XSIDE) {
1719 /* mpc_action_xside_xid */
1720 if (ch->xid_th == NULL)
1722 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1723 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1724 ch->ccw[9].count = TH_HEADER_LENGTH;
1725 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1727 if (ch->xid == NULL)
1729 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1730 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1731 ch->ccw[10].count = XID2_LENGTH;
1732 ch->ccw[10].cda = virt_to_phys(ch->xid);
1734 ch->ccw[11].cmd_code = CCW_CMD_READ;
1735 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1736 ch->ccw[11].count = TH_HEADER_LENGTH;
1737 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1739 ch->ccw[12].cmd_code = CCW_CMD_READ;
1740 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1741 ch->ccw[12].count = XID2_LENGTH;
1742 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1744 ch->ccw[13].cmd_code = CCW_CMD_READ;
1745 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1747 } else { /* side == YSIDE : mpc_action_yside_xid */
1748 ch->ccw[9].cmd_code = CCW_CMD_READ;
1749 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1750 ch->ccw[9].count = TH_HEADER_LENGTH;
1751 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1753 ch->ccw[10].cmd_code = CCW_CMD_READ;
1754 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1755 ch->ccw[10].count = XID2_LENGTH;
1756 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1758 if (ch->xid_th == NULL)
1760 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1761 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1762 ch->ccw[11].count = TH_HEADER_LENGTH;
1763 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1765 if (ch->xid == NULL)
1767 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1768 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1769 ch->ccw[12].count = XID2_LENGTH;
1770 ch->ccw[12].cda = virt_to_phys(ch->xid);
1772 if (ch->xid_id == NULL)
1774 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1775 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1778 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1779 ch->ccw[13].count = 4;
1781 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1782 ch->ccw[14].flags = CCW_FLAG_SLI;
1783 ch->ccw[14].count = 0;
1784 ch->ccw[14].cda = 0;
1786 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1787 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1788 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1789 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1792 /* Such conditional locking is a known problem for
1793 * sparse because its static undeterministic.
1794 * Warnings should be ignored here. */
1795 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1799 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1800 rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1801 (unsigned long)ch, 0xff, 0);
1803 if (gotlock) /* see remark above about conditional locking */
1804 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1807 ctcm_ccw_check_rc(ch, rc,
1808 (side == XSIDE) ? "x-side XID" : "y-side XID");
1812 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1813 __func__, ch, ch->id);
1819 * MPC Group Station FSM action
1820 * CTCM_PROTO_MPC only
1822 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1824 mpc_action_side_xid(fsm, arg, XSIDE);
1828 * MPC Group Station FSM action
1829 * CTCM_PROTO_MPC only
1831 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1833 mpc_action_side_xid(fsm, arg, YSIDE);
1837 * MPC Group Station FSM action
1838 * CTCM_PROTO_MPC only
1840 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1842 struct channel *ch = arg;
1843 struct net_device *dev = ch->netdev;
1844 struct ctcm_priv *priv = dev->ml_priv;
1845 struct mpc_group *grp = priv->mpcg;
1847 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1848 __func__, smp_processor_id(), ch, ch->id);
1850 if (ch->xid == NULL) {
1851 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1852 "%s(%s): ch->xid == NULL",
1853 CTCM_FUNTAIL, dev->name);
1857 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1859 ch->xid->xid2_option = XID2_0;
1861 switch (fsm_getstate(grp->fsm)) {
1862 case MPCG_STATE_XID2INITW:
1863 case MPCG_STATE_XID2INITX:
1864 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1866 case MPCG_STATE_XID0IOWAIT:
1867 case MPCG_STATE_XID0IOWAIX:
1868 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1872 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1878 * MPC Group Station FSM action
1879 * CTCM_PROTO_MPC only
1881 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1883 struct net_device *dev = arg;
1884 struct ctcm_priv *priv = dev->ml_priv;
1885 struct mpc_group *grp = NULL;
1894 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1895 struct channel *ch = priv->channel[direction];
1896 struct xid2 *thisxid = ch->xid;
1897 ch->xid_skb->data = ch->xid_skb_data;
1898 skb_reset_tail_pointer(ch->xid_skb);
1899 ch->xid_skb->len = 0;
1900 thisxid->xid2_option = XID2_7;
1904 if (grp->outstanding_xid7_p2 > 0) {
1905 if (grp->roll == YSIDE) {
1906 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1907 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1908 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1909 memcpy(skb_put(ch->xid_skb,
1911 &thdummy, TH_HEADER_LENGTH);
1914 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1915 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1916 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1917 memcpy(skb_put(ch->xid_skb,
1919 &thnorm, TH_HEADER_LENGTH);
1924 if (grp->roll == YSIDE) {
1925 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1926 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1927 memcpy(skb_put(ch->xid_skb,
1929 &thnorm, TH_HEADER_LENGTH);
1930 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1933 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1934 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1935 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1936 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1937 &thdummy, TH_HEADER_LENGTH);
1943 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1950 * MPC Group Station FSM action
1951 * CTCM_PROTO_MPC only
1953 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1956 struct mpcg_info *mpcginfo = arg;
1957 struct channel *ch = mpcginfo->ch;
1958 struct net_device *dev = ch->netdev;
1959 struct ctcm_priv *priv = dev->ml_priv;
1960 struct mpc_group *grp = priv->mpcg;
1962 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1963 __func__, ch->id, grp->outstanding_xid2,
1964 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1966 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1967 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1969 grp->outstanding_xid2--;
1970 grp->outstanding_xid7++;
1971 grp->outstanding_xid7_p2++;
1973 /* must change state before validating xid to */
1974 /* properly handle interim interrupts received*/
1975 switch (fsm_getstate(grp->fsm)) {
1976 case MPCG_STATE_XID2INITW:
1977 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1978 mpc_validate_xid(mpcginfo);
1980 case MPCG_STATE_XID0IOWAIT:
1981 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1982 mpc_validate_xid(mpcginfo);
1984 case MPCG_STATE_XID2INITX:
1985 if (grp->outstanding_xid2 == 0) {
1986 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1987 mpc_validate_xid(mpcginfo);
1988 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991 case MPCG_STATE_XID0IOWAIX:
1992 if (grp->outstanding_xid2 == 0) {
1993 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1994 mpc_validate_xid(mpcginfo);
1995 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2000 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2001 __func__, ch->id, grp->outstanding_xid2,
2002 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2003 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2005 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2012 * MPC Group Station FSM action
2013 * CTCM_PROTO_MPC only
2015 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2017 struct mpcg_info *mpcginfo = arg;
2018 struct channel *ch = mpcginfo->ch;
2019 struct net_device *dev = ch->netdev;
2020 struct ctcm_priv *priv = dev->ml_priv;
2021 struct mpc_group *grp = priv->mpcg;
2023 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2024 __func__, smp_processor_id(), ch, ch->id);
2025 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2026 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2028 grp->outstanding_xid7--;
2029 ch->xid_skb->data = ch->xid_skb_data;
2030 skb_reset_tail_pointer(ch->xid_skb);
2031 ch->xid_skb->len = 0;
2033 switch (fsm_getstate(grp->fsm)) {
2034 case MPCG_STATE_XID7INITI:
2035 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2036 mpc_validate_xid(mpcginfo);
2038 case MPCG_STATE_XID7INITW:
2039 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2040 mpc_validate_xid(mpcginfo);
2042 case MPCG_STATE_XID7INITZ:
2043 case MPCG_STATE_XID7INITX:
2044 if (grp->outstanding_xid7 == 0) {
2045 if (grp->outstanding_xid7_p2 > 0) {
2046 grp->outstanding_xid7 =
2047 grp->outstanding_xid7_p2;
2048 grp->outstanding_xid7_p2 = 0;
2050 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2052 mpc_validate_xid(mpcginfo);
2053 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2056 mpc_validate_xid(mpcginfo);
2063 * mpc_action helper of an MPC Group Station FSM action
2064 * CTCM_PROTO_MPC only
2066 static int mpc_send_qllc_discontact(struct net_device *dev)
2069 struct sk_buff *skb;
2070 struct qllc *qllcptr;
2071 struct ctcm_priv *priv = dev->ml_priv;
2072 struct mpc_group *grp = priv->mpcg;
2074 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2075 __func__, mpcg_state_names[grp->saved_state]);
2077 switch (grp->saved_state) {
2079 * establish conn callback function is
2080 * preferred method to report failure
2082 case MPCG_STATE_XID0IOWAIT:
2083 case MPCG_STATE_XID0IOWAIX:
2084 case MPCG_STATE_XID7INITI:
2085 case MPCG_STATE_XID7INITZ:
2086 case MPCG_STATE_XID2INITW:
2087 case MPCG_STATE_XID2INITX:
2088 case MPCG_STATE_XID7INITW:
2089 case MPCG_STATE_XID7INITX:
2090 if (grp->estconnfunc) {
2091 grp->estconnfunc(grp->port_num, -1, 0);
2092 grp->estconnfunc = NULL;
2095 case MPCG_STATE_FLOWC:
2096 case MPCG_STATE_READY:
2097 grp->send_qllc_disc = 2;
2098 new_len = sizeof(struct qllc);
2099 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2100 if (qllcptr == NULL) {
2101 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2102 "%s(%s): qllcptr allocation error",
2103 CTCM_FUNTAIL, dev->name);
2107 qllcptr->qllc_address = 0xcc;
2108 qllcptr->qllc_commands = 0x03;
2110 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2113 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2114 "%s(%s): skb allocation error",
2115 CTCM_FUNTAIL, dev->name);
2116 priv->stats.rx_dropped++;
2121 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2124 if (skb_headroom(skb) < 4) {
2125 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2126 "%s(%s): skb_headroom error",
2127 CTCM_FUNTAIL, dev->name);
2128 dev_kfree_skb_any(skb);
2132 *((__u32 *)skb_push(skb, 4)) =
2133 priv->channel[CTCM_READ]->pdu_seq;
2134 priv->channel[CTCM_READ]->pdu_seq++;
2135 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2136 __func__, priv->channel[CTCM_READ]->pdu_seq);
2138 /* receipt of CC03 resets anticipated sequence number on
2140 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2141 skb_reset_mac_header(skb);
2143 skb->protocol = htons(ETH_P_SNAP);
2144 skb->ip_summed = CHECKSUM_UNNECESSARY;
2146 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2157 /* --- This is the END my friend --- */