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>
46 #include <linux/io.h> /* instead of <asm/io.h> ok ? */
47 #include <asm/ccwdev.h>
48 #include <asm/ccwgroup.h>
49 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */
50 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */
51 #include <linux/wait.h>
52 #include <linux/moduleparam.h>
53 #include <asm/idals.h>
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 sprintf(addr, "%16.16llx", (__u64)rptr);
149 sprintf(boff, "%4.4X", (__u32)ct);
153 if ((sw == 4) || (sw == 12))
158 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
172 if ((strcmp(duphex, bhex)) != 0) {
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 sprintf(tdup, "Duplicate as above to %s", addr);
201 ctcm_pr_debug(" --- %s ---\n", tdup);
203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
204 addr, boff, bhex, basc);
207 sprintf(tdup, "Duplicate as above to %s", addr);
208 ctcm_pr_debug(" --- %s ---\n", tdup);
211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",
212 addr, boff, bhex, basc);
218 } /* end of ctcmpc_dumpit */
223 * Dump header and first 16 bytes of an sk_buff for debugging purposes.
225 * skb The sk_buff to dump.
226 * offset Offset relative to skb-data, where to start the dump.
228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
231 struct th_header *header;
240 header = (struct th_header *)p;
242 ctcm_pr_debug("dump:\n");
243 ctcm_pr_debug("skb len=%d \n", skb->len);
245 switch (header->th_ch_flag) {
250 if ((header->th_blk_flag == TH_DATA_IS_XID) &&
251 (header->th_is_xid == 0x01))
261 pheader = (struct pdu *)p;
262 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
263 pheader->pdu_offset, pheader->pdu_offset);
264 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);
265 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
266 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);
270 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);
271 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);
272 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
273 ctcm_pr_debug("th->type : %s\n",
274 (header->th_is_xid) ? "DATA" : "XID");
275 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);
281 ctcm_pr_debug("data: ");
282 for (i = 0; i < bl; i++)
283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
288 static struct net_device *ctcmpc_get_dev(int port_num)
291 struct net_device *dev;
292 struct ctcm_priv *priv;
294 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
296 dev = __dev_get_by_name(&init_net, device);
299 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
300 "%s: Device not found by name: %s",
301 CTCM_FUNTAIL, device);
306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
307 "%s(%s): dev->ml_priv is NULL",
308 CTCM_FUNTAIL, device);
311 if (priv->mpcg == NULL) {
312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
313 "%s(%s): priv->mpcg is NULL",
314 CTCM_FUNTAIL, device);
321 * ctc_mpc_alloc_channel
322 * (exported interface)
324 * Device Initialization :
325 * ACTPATH driven IO operations
327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
329 struct net_device *dev;
330 struct mpc_group *grp;
331 struct ctcm_priv *priv;
333 dev = ctcmpc_get_dev(port_num);
339 grp->allochanfunc = callback;
340 grp->port_num = port_num;
341 grp->port_persist = 1;
343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
347 switch (fsm_getstate(grp->fsm)) {
348 case MPCG_STATE_INOP:
349 /* Group is in the process of terminating */
350 grp->alloc_called = 1;
352 case MPCG_STATE_RESET:
353 /* MPC Group will transition to state */
354 /* MPCG_STATE_XID2INITW iff the minimum number */
355 /* of 1 read and 1 write channel have successfully*/
357 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
359 grp->send_qllc_disc = 1;
360 /* Else, fall through */
361 case MPCG_STATE_XID0IOWAIT:
362 fsm_deltimer(&grp->timer);
363 grp->outstanding_xid2 = 0;
364 grp->outstanding_xid7 = 0;
365 grp->outstanding_xid7_p2 = 0;
366 grp->saved_xid2 = NULL;
369 fsm_event(priv->fsm, DEV_EVENT_START, dev);
371 case MPCG_STATE_READY:
372 /* XID exchanges completed after PORT was activated */
373 /* Link station already active */
374 /* Maybe timing issue...retry callback */
375 grp->allocchan_callback_retries++;
376 if (grp->allocchan_callback_retries < 4) {
377 if (grp->allochanfunc)
378 grp->allochanfunc(grp->port_num,
379 grp->group_max_buflen);
381 /* there are problems...bail out */
382 /* there may be a state mismatch so restart */
383 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
384 grp->allocchan_callback_retries = 0;
391 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
394 * ctc_mpc_establish_connectivity
395 * (exported interface)
397 void ctc_mpc_establish_connectivity(int port_num,
398 void (*callback)(int, int, int))
400 struct net_device *dev;
401 struct mpc_group *grp;
402 struct ctcm_priv *priv;
403 struct channel *rch, *wch;
405 dev = ctcmpc_get_dev(port_num);
410 rch = priv->channel[CTCM_READ];
411 wch = priv->channel[CTCM_WRITE];
413 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
415 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
417 grp->estconnfunc = callback;
418 grp->port_num = port_num;
420 switch (fsm_getstate(grp->fsm)) {
421 case MPCG_STATE_READY:
422 /* XID exchanges completed after PORT was activated */
423 /* Link station already active */
424 /* Maybe timing issue...retry callback */
425 fsm_deltimer(&grp->timer);
426 grp->estconn_callback_retries++;
427 if (grp->estconn_callback_retries < 4) {
428 if (grp->estconnfunc) {
429 grp->estconnfunc(grp->port_num, 0,
430 grp->group_max_buflen);
431 grp->estconnfunc = NULL;
434 /* there are problems...bail out */
435 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
436 grp->estconn_callback_retries = 0;
439 case MPCG_STATE_INOP:
440 case MPCG_STATE_RESET:
441 /* MPC Group is not ready to start XID - min num of */
442 /* 1 read and 1 write channel have not been acquired*/
444 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
445 "%s(%s): REJECTED - inactive channels",
446 CTCM_FUNTAIL, dev->name);
447 if (grp->estconnfunc) {
448 grp->estconnfunc(grp->port_num, -1, 0);
449 grp->estconnfunc = NULL;
452 case MPCG_STATE_XID2INITW:
453 /* alloc channel was called but no XID exchange */
454 /* has occurred. initiate xside XID exchange */
455 /* make sure yside XID0 processing has not started */
457 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
458 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
459 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
460 "%s(%s): ABORT - PASSIVE XID",
461 CTCM_FUNTAIL, dev->name);
464 grp->send_qllc_disc = 1;
465 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
466 fsm_deltimer(&grp->timer);
467 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
468 MPCG_EVENT_TIMER, dev);
469 grp->outstanding_xid7 = 0;
470 grp->outstanding_xid7_p2 = 0;
471 grp->saved_xid2 = NULL;
472 if ((rch->in_mpcgroup) &&
473 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
474 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
476 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
477 "%s(%s): RX-%s not ready for ACTIVE XID0",
478 CTCM_FUNTAIL, dev->name, rch->id);
479 if (grp->estconnfunc) {
480 grp->estconnfunc(grp->port_num, -1, 0);
481 grp->estconnfunc = NULL;
483 fsm_deltimer(&grp->timer);
486 if ((wch->in_mpcgroup) &&
487 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
488 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
490 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
491 "%s(%s): WX-%s not ready for ACTIVE XID0",
492 CTCM_FUNTAIL, dev->name, wch->id);
493 if (grp->estconnfunc) {
494 grp->estconnfunc(grp->port_num, -1, 0);
495 grp->estconnfunc = NULL;
497 fsm_deltimer(&grp->timer);
501 case MPCG_STATE_XID0IOWAIT:
502 /* already in active XID negotiations */
508 CTCM_PR_DEBUG("Exit %s()\n", __func__);
511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
515 * (exported interface)
517 void ctc_mpc_dealloc_ch(int port_num)
519 struct net_device *dev;
520 struct ctcm_priv *priv;
521 struct mpc_group *grp;
523 dev = ctcmpc_get_dev(port_num);
529 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
530 "%s: %s: refcount = %d\n",
531 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
533 fsm_deltimer(&priv->restart_timer);
534 grp->channels_terminating = 0;
535 fsm_deltimer(&grp->timer);
536 grp->allochanfunc = NULL;
537 grp->estconnfunc = NULL;
538 grp->port_persist = 0;
539 grp->send_qllc_disc = 0;
540 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
548 * ctc_mpc_flow_control
549 * (exported interface)
551 void ctc_mpc_flow_control(int port_num, int flowc)
553 struct ctcm_priv *priv;
554 struct mpc_group *grp;
555 struct net_device *dev;
559 dev = ctcmpc_get_dev(port_num);
565 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
566 "%s: %s: flowc = %d",
567 CTCM_FUNTAIL, dev->name, flowc);
569 rch = priv->channel[CTCM_READ];
571 mpcg_state = fsm_getstate(grp->fsm);
574 if (mpcg_state == MPCG_STATE_FLOWC)
576 if (mpcg_state == MPCG_STATE_READY) {
577 if (grp->flow_off_called == 1)
578 grp->flow_off_called = 0;
580 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
585 if (mpcg_state == MPCG_STATE_FLOWC) {
586 fsm_newstate(grp->fsm, MPCG_STATE_READY);
587 /* ensure any data that has accumulated */
588 /* on the io_queue will now be sen t */
589 tasklet_schedule(&rch->ch_tasklet);
591 /* possible race condition */
592 if (mpcg_state == MPCG_STATE_READY) {
593 grp->flow_off_called = 1;
600 EXPORT_SYMBOL(ctc_mpc_flow_control);
602 static int mpc_send_qllc_discontact(struct net_device *);
605 * helper function of ctcmpc_unpack_skb
607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
609 struct channel *rch = mpcginfo->ch;
610 struct net_device *dev = rch->netdev;
611 struct ctcm_priv *priv = dev->ml_priv;
612 struct mpc_group *grp = priv->mpcg;
613 struct channel *ch = priv->channel[CTCM_WRITE];
615 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
616 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
618 grp->sweep_rsp_pend_num--;
620 if ((grp->sweep_req_pend_num == 0) &&
621 (grp->sweep_rsp_pend_num == 0)) {
622 fsm_deltimer(&ch->sweep_timer);
624 rch->th_seq_num = 0x00;
625 ch->th_seq_num = 0x00;
626 ctcm_clear_busy_do(dev);
634 * helper function of mpc_rcvd_sweep_req
635 * which is a helper of ctcmpc_unpack_skb
637 static void ctcmpc_send_sweep_resp(struct channel *rch)
639 struct net_device *dev = rch->netdev;
640 struct ctcm_priv *priv = dev->ml_priv;
641 struct mpc_group *grp = priv->mpcg;
642 struct th_sweep *header;
643 struct sk_buff *sweep_skb;
644 struct channel *ch = priv->channel[CTCM_WRITE];
646 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
648 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
649 if (sweep_skb == NULL) {
650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
651 "%s(%s): sweep_skb allocation ERROR\n",
652 CTCM_FUNTAIL, rch->id);
656 header = kmalloc(sizeof(struct th_sweep), gfp_type());
659 dev_kfree_skb_any(sweep_skb);
663 header->th.th_seg = 0x00 ;
664 header->th.th_ch_flag = TH_SWEEP_RESP;
665 header->th.th_blk_flag = 0x00;
666 header->th.th_is_xid = 0x00;
667 header->th.th_seq_num = 0x00;
668 header->sw.th_last_seq = ch->th_seq_num;
670 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
674 netif_trans_update(dev);
675 skb_queue_tail(&ch->sweep_queue, sweep_skb);
677 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
683 ctcm_clear_busy_do(dev);
684 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
690 * helper function of ctcmpc_unpack_skb
692 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
694 struct channel *rch = mpcginfo->ch;
695 struct net_device *dev = rch->netdev;
696 struct ctcm_priv *priv = dev->ml_priv;
697 struct mpc_group *grp = priv->mpcg;
698 struct channel *ch = priv->channel[CTCM_WRITE];
701 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
702 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
704 if (grp->in_sweep == 0) {
706 ctcm_test_and_set_busy(dev);
707 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
708 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
711 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
713 grp->sweep_req_pend_num--;
714 ctcmpc_send_sweep_resp(ch);
720 * MPC Group Station FSM definitions
722 static const char *mpcg_event_names[] = {
723 [MPCG_EVENT_INOP] = "INOP Condition",
724 [MPCG_EVENT_DISCONC] = "Discontact Received",
725 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
726 [MPCG_EVENT_XID2] = "XID2 Received",
727 [MPCG_EVENT_XID2DONE] = "XID0 Complete",
728 [MPCG_EVENT_XID7DONE] = "XID7 Complete",
729 [MPCG_EVENT_TIMER] = "XID Setup Timer",
730 [MPCG_EVENT_DOIO] = "XID DoIO",
733 static const char *mpcg_state_names[] = {
734 [MPCG_STATE_RESET] = "Reset",
735 [MPCG_STATE_INOP] = "INOP",
736 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",
737 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",
738 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",
739 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",
740 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",
741 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",
742 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",
743 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",
744 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",
745 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",
746 [MPCG_STATE_READY] = "READY",
750 * The MPC Group Station FSM
753 static const fsm_node mpcg_fsm[] = {
754 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },
755 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },
756 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },
758 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
759 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },
761 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
763 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
764 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
765 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
767 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
769 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
770 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
771 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
773 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
774 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
775 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
776 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },
777 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },
778 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
779 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },
781 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
782 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
783 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },
784 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
785 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },
786 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },
788 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },
790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },
792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },
793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },
795 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },
796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },
797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },
798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },
799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },
800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },
802 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },
803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
804 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
805 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },
806 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },
807 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
808 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },
810 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },
811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },
812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },
814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },
815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },
817 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },
818 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },
821 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
824 * MPC Group Station FSM action
825 * CTCM_PROTO_MPC only
827 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
829 struct net_device *dev = arg;
830 struct ctcm_priv *priv = dev->ml_priv;
831 struct mpc_group *grp = priv->mpcg;
834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
835 "%s(%s): No MPC group",
836 CTCM_FUNTAIL, dev->name);
840 fsm_deltimer(&grp->timer);
842 if (grp->saved_xid2->xid2_flag2 == 0x40) {
843 priv->xid->xid2_flag2 = 0x00;
844 if (grp->estconnfunc) {
845 grp->estconnfunc(grp->port_num, 1,
846 grp->group_max_buflen);
847 grp->estconnfunc = NULL;
848 } else if (grp->allochanfunc)
849 grp->send_qllc_disc = 1;
851 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
852 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
854 CTCM_FUNTAIL, dev->name);
858 grp->port_persist = 1;
859 grp->out_of_sequence = 0;
860 grp->estconn_called = 0;
862 tasklet_hi_schedule(&grp->mpc_tasklet2);
868 * helper of ctcm_init_netdevice
869 * CTCM_PROTO_MPC only
871 void mpc_group_ready(unsigned long adev)
873 struct net_device *dev = (struct net_device *)adev;
874 struct ctcm_priv *priv = dev->ml_priv;
875 struct mpc_group *grp = priv->mpcg;
876 struct channel *ch = NULL;
879 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
880 "%s(%s): No MPC group",
881 CTCM_FUNTAIL, dev->name);
885 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
886 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
887 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
889 fsm_newstate(grp->fsm, MPCG_STATE_READY);
891 /* Put up a read on the channel */
892 ch = priv->channel[CTCM_READ];
894 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
895 __func__, ch->pdu_seq);
897 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
898 /* Put the write channel in idle state */
899 ch = priv->channel[CTCM_WRITE];
900 if (ch->collect_len > 0) {
901 spin_lock(&ch->collect_lock);
902 ctcm_purge_skb_queue(&ch->collect_queue);
904 spin_unlock(&ch->collect_lock);
906 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
907 ctcm_clear_busy(dev);
909 if (grp->estconnfunc) {
910 grp->estconnfunc(grp->port_num, 0,
911 grp->group_max_buflen);
912 grp->estconnfunc = NULL;
913 } else if (grp->allochanfunc)
914 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
916 grp->send_qllc_disc = 1;
917 grp->changed_side = 0;
924 * Increment the MPC Group Active Channel Counts
925 * helper of dev_action (called from channel fsm)
927 void mpc_channel_action(struct channel *ch, int direction, int action)
929 struct net_device *dev = ch->netdev;
930 struct ctcm_priv *priv = dev->ml_priv;
931 struct mpc_group *grp = priv->mpcg;
934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
935 "%s(%s): No MPC group",
936 CTCM_FUNTAIL, dev->name);
940 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
943 "%s: %i / Grp:%s total_channels=%i, active_channels: "
944 "read=%i, write=%i\n", __func__, action,
945 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
946 grp->active_channels[CTCM_READ],
947 grp->active_channels[CTCM_WRITE]);
949 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
950 grp->num_channel_paths++;
951 grp->active_channels[direction]++;
952 grp->outstanding_xid2++;
955 if (ch->xid_skb != NULL)
956 dev_kfree_skb_any(ch->xid_skb);
958 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
959 GFP_ATOMIC | GFP_DMA);
960 if (ch->xid_skb == NULL) {
961 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
962 "%s(%s): Couldn't alloc ch xid_skb\n",
963 CTCM_FUNTAIL, dev->name);
964 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
967 ch->xid_skb_data = ch->xid_skb->data;
968 ch->xid_th = (struct th_header *)ch->xid_skb->data;
969 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
970 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
971 skb_put(ch->xid_skb, XID2_LENGTH);
972 ch->xid_id = skb_tail_pointer(ch->xid_skb);
973 ch->xid_skb->data = ch->xid_skb_data;
974 skb_reset_tail_pointer(ch->xid_skb);
975 ch->xid_skb->len = 0;
977 skb_put_data(ch->xid_skb, grp->xid_skb->data,
980 ch->xid->xid2_dlc_type =
981 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
982 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
984 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
985 ch->xid->xid2_buf_len = 0x00;
987 ch->xid_skb->data = ch->xid_skb_data;
988 skb_reset_tail_pointer(ch->xid_skb);
989 ch->xid_skb->len = 0;
991 fsm_newstate(ch->fsm, CH_XID0_PENDING);
993 if ((grp->active_channels[CTCM_READ] > 0) &&
994 (grp->active_channels[CTCM_WRITE] > 0) &&
995 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
996 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
997 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
998 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
999 __func__, dev->name);
1001 } else if ((action == MPC_CHANNEL_REMOVE) &&
1002 (ch->in_mpcgroup == 1)) {
1003 ch->in_mpcgroup = 0;
1004 grp->num_channel_paths--;
1005 grp->active_channels[direction]--;
1007 if (ch->xid_skb != NULL)
1008 dev_kfree_skb_any(ch->xid_skb);
1011 if (grp->channels_terminating)
1014 if (((grp->active_channels[CTCM_READ] == 0) &&
1015 (grp->active_channels[CTCM_WRITE] > 0))
1016 || ((grp->active_channels[CTCM_WRITE] == 0) &&
1017 (grp->active_channels[CTCM_READ] > 0)))
1018 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1021 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1022 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1023 "read=%i, write=%i\n", __func__, action,
1024 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1025 grp->active_channels[CTCM_READ],
1026 grp->active_channels[CTCM_WRITE]);
1028 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1032 * Unpack a just received skb and hand it over to
1034 * special MPC version of unpack_skb.
1036 * ch The channel where this skb has been received.
1037 * pskb The received skb.
1039 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1041 struct net_device *dev = ch->netdev;
1042 struct ctcm_priv *priv = dev->ml_priv;
1043 struct mpc_group *grp = priv->mpcg;
1044 struct pdu *curr_pdu;
1045 struct mpcg_info *mpcginfo;
1046 struct th_header *header = NULL;
1047 struct th_sweep *sweep = NULL;
1048 int pdu_last_seen = 0;
1050 struct sk_buff *skb;
1054 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1055 __func__, dev->name, smp_processor_id(), ch->id);
1057 header = (struct th_header *)pskb->data;
1058 if ((header->th_seg == 0) &&
1059 (header->th_ch_flag == 0) &&
1060 (header->th_blk_flag == 0) &&
1061 (header->th_seq_num == 0))
1062 /* nothing for us */ goto done;
1064 CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1065 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1066 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1069 pskb->ip_summed = CHECKSUM_UNNECESSARY;
1070 skb_pull(pskb, TH_HEADER_LENGTH);
1072 if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1073 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1074 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1075 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1076 (header->th_seq_num != ch->th_seq_num + 1) &&
1077 (ch->th_seq_num != 0))) {
1078 /* This is NOT the next segment *
1079 * we are not the correct race winner *
1080 * go away and let someone else win *
1081 * BUT..this only applies if xid negot *
1084 grp->out_of_sequence += 1;
1085 __skb_push(pskb, TH_HEADER_LENGTH);
1086 skb_queue_tail(&ch->io_queue, pskb);
1087 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1088 "got:%08x\n", __func__,
1089 ch->th_seq_num + 1, header->th_seq_num);
1093 grp->out_of_sequence = 0;
1094 ch->th_seq_num = header->th_seq_num;
1096 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1097 __func__, ch->th_seq_num);
1099 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1101 while ((pskb->len > 0) && !pdu_last_seen) {
1102 curr_pdu = (struct pdu *)pskb->data;
1104 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1105 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1106 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1107 __func__, pskb->len);
1109 skb_pull(pskb, PDU_HEADER_LENGTH);
1111 if (curr_pdu->pdu_flag & PDU_LAST)
1113 if (curr_pdu->pdu_flag & PDU_CNTL)
1114 pskb->protocol = htons(ETH_P_SNAP);
1116 pskb->protocol = htons(ETH_P_SNA_DIX);
1118 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1120 "%s(%s): Dropping packet with "
1122 CTCM_FUNTAIL, dev->name, pskb->len);
1124 priv->stats.rx_dropped++;
1125 priv->stats.rx_length_errors++;
1128 skb_reset_mac_header(pskb);
1129 new_len = curr_pdu->pdu_offset;
1130 CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1132 if ((new_len == 0) || (new_len > pskb->len)) {
1133 /* should never happen */
1134 /* pskb len must be hosed...bail out */
1135 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1136 "%s(%s): non valid pdu_offset: %04x",
1137 /* "data may be lost", */
1138 CTCM_FUNTAIL, dev->name, new_len);
1141 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1144 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1145 "%s(%s): MEMORY allocation error",
1146 CTCM_FUNTAIL, dev->name);
1147 priv->stats.rx_dropped++;
1148 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1151 skb_put_data(skb, pskb->data, new_len);
1153 skb_reset_mac_header(skb);
1154 skb->dev = pskb->dev;
1155 skb->protocol = pskb->protocol;
1156 skb->ip_summed = CHECKSUM_UNNECESSARY;
1157 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1160 if (do_debug_data) {
1161 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1162 __func__, ch->pdu_seq);
1163 ctcm_pr_debug("%s: skb:%0lx "
1164 "skb len: %d \n", __func__,
1165 (unsigned long)skb, skb->len);
1166 ctcm_pr_debug("%s: up to 32 bytes "
1167 "of pdu_data sent\n", __func__);
1168 ctcmpc_dump32((char *)skb->data, skb->len);
1172 sendrc = netif_rx(skb);
1173 priv->stats.rx_packets++;
1174 priv->stats.rx_bytes += skblen;
1175 skb_pull(pskb, new_len); /* point to next PDU */
1178 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1179 if (mpcginfo == NULL)
1183 mpcginfo->th = header;
1184 mpcginfo->skb = pskb;
1185 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1188 sweep = (struct th_sweep *)pskb->data;
1189 mpcginfo->sweep = sweep;
1190 if (header->th_ch_flag == TH_SWEEP_REQ)
1191 mpc_rcvd_sweep_req(mpcginfo);
1192 else if (header->th_ch_flag == TH_SWEEP_RESP)
1193 mpc_rcvd_sweep_resp(mpcginfo);
1194 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1195 struct xid2 *thisxid = (struct xid2 *)pskb->data;
1196 skb_pull(pskb, XID2_LENGTH);
1197 mpcginfo->xid = thisxid;
1198 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1199 } else if (header->th_blk_flag == TH_DISCONTACT)
1200 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1201 else if (header->th_seq_num != 0) {
1202 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1203 "%s(%s): control pkt expected\n",
1204 CTCM_FUNTAIL, dev->name);
1205 priv->stats.rx_dropped++;
1206 /* mpcginfo only used for non-data transfers */
1208 ctcmpc_dump_skb(pskb, -8);
1214 dev_kfree_skb_any(pskb);
1215 if (sendrc == NET_RX_DROP) {
1217 "The network backlog for %s is exceeded, "
1218 "package dropped\n", __func__);
1219 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1222 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1223 __func__, dev->name, ch, ch->id);
1227 * tasklet helper for mpc's skb unpacking.
1229 * ch The channel to work on.
1230 * Allow flow control back pressure to occur here.
1231 * Throttling back channel can result in excessive
1232 * channel inactivity and system deact of channel
1234 void ctcmpc_bh(unsigned long thischan)
1236 struct channel *ch = (struct channel *)thischan;
1237 struct sk_buff *skb;
1238 struct net_device *dev = ch->netdev;
1239 struct ctcm_priv *priv = dev->ml_priv;
1240 struct mpc_group *grp = priv->mpcg;
1242 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",
1243 dev->name, smp_processor_id(), __func__, ch->id);
1244 /* caller has requested driver to throttle back */
1245 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1246 (skb = skb_dequeue(&ch->io_queue))) {
1247 ctcmpc_unpack_skb(ch, skb);
1248 if (grp->out_of_sequence > 20) {
1249 /* assume data loss has occurred if */
1250 /* missing seq_num for extended */
1251 /* period of time */
1252 grp->out_of_sequence = 0;
1253 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1256 if (skb == skb_peek(&ch->io_queue))
1259 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1260 __func__, dev->name, ch, ch->id);
1265 * MPC Group Initializations
1267 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1269 struct mpc_group *grp;
1271 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1272 "Enter %s(%p)", CTCM_FUNTAIL, priv);
1274 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1278 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1279 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1280 mpcg_fsm_len, GFP_KERNEL);
1281 if (grp->fsm == NULL) {
1286 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1287 fsm_settimer(grp->fsm, &grp->timer);
1290 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1291 if (grp->xid_skb == NULL) {
1292 kfree_fsm(grp->fsm);
1296 /* base xid for all channels in group */
1297 grp->xid_skb_data = grp->xid_skb->data;
1298 grp->xid_th = (struct th_header *)grp->xid_skb->data;
1299 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1301 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1302 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1303 grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1304 grp->xid->xid2_sender_id = jiffies;
1306 grp->xid_id = skb_tail_pointer(grp->xid_skb);
1307 skb_put_data(grp->xid_skb, "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 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1320 grp->saved_xid2 = NULL;
1321 priv->xid = grp->xid;
1327 * The MPC Group Station FSM
1331 * MPC Group Station FSM actions
1332 * CTCM_PROTO_MPC only
1336 * NOP action for statemachines
1338 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1343 * invoked when the device transitions to dev_stopped
1344 * MPC will stop each individual channel if a single XID failure
1345 * occurs, or will intitiate all channels be stopped if a GROUP
1346 * level failure occurs.
1348 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1350 struct net_device *dev = arg;
1351 struct ctcm_priv *priv;
1352 struct mpc_group *grp;
1353 struct channel *wch;
1355 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1357 priv = dev->ml_priv;
1359 grp->flow_off_called = 0;
1360 fsm_deltimer(&grp->timer);
1361 if (grp->channels_terminating)
1364 grp->channels_terminating = 1;
1365 grp->saved_state = fsm_getstate(grp->fsm);
1366 fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1367 if (grp->saved_state > MPCG_STATE_XID7INITF)
1368 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1369 "%s(%s): MPC GROUP INOPERATIVE",
1370 CTCM_FUNTAIL, dev->name);
1371 if ((grp->saved_state != MPCG_STATE_RESET) ||
1372 /* dealloc_channel has been called */
1373 (grp->port_persist == 0))
1374 fsm_deltimer(&priv->restart_timer);
1376 wch = priv->channel[CTCM_WRITE];
1378 switch (grp->saved_state) {
1379 case MPCG_STATE_RESET:
1380 case MPCG_STATE_INOP:
1381 case MPCG_STATE_XID2INITW:
1382 case MPCG_STATE_XID0IOWAIT:
1383 case MPCG_STATE_XID2INITX:
1384 case MPCG_STATE_XID7INITW:
1385 case MPCG_STATE_XID7INITX:
1386 case MPCG_STATE_XID0IOWAIX:
1387 case MPCG_STATE_XID7INITI:
1388 case MPCG_STATE_XID7INITZ:
1389 case MPCG_STATE_XID7INITF:
1391 case MPCG_STATE_FLOWC:
1392 case MPCG_STATE_READY:
1394 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1397 grp->xid2_tgnum = 0;
1398 grp->group_max_buflen = 0; /*min of all received */
1399 grp->outstanding_xid2 = 0;
1400 grp->outstanding_xid7 = 0;
1401 grp->outstanding_xid7_p2 = 0;
1402 grp->saved_xid2 = NULL;
1404 grp->changed_side = 0;
1406 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1407 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1408 grp->rcvd_xid_skb->len = 0;
1409 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1410 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1412 if (grp->send_qllc_disc == 1) {
1413 grp->send_qllc_disc = 0;
1414 mpc_send_qllc_discontact(dev);
1417 /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1418 /* This can result in INOP of VTAM PU due to halting of */
1419 /* outstanding IO which causes a sense to be returned */
1420 /* Only about 3 senses are allowed and then IOS/VTAM will*/
1421 /* become unreachable without manual intervention */
1422 if ((grp->port_persist == 1) || (grp->alloc_called)) {
1423 grp->alloc_called = 0;
1424 fsm_deltimer(&priv->restart_timer);
1425 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1426 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1427 if (grp->saved_state > MPCG_STATE_XID7INITF)
1428 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1429 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1430 CTCM_FUNTAIL, dev->name);
1432 fsm_deltimer(&priv->restart_timer);
1433 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1434 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1435 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1436 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1437 CTCM_FUNTAIL, dev->name);
1442 * Handle mpc group action timeout.
1443 * MPC Group Station FSM action
1444 * CTCM_PROTO_MPC only
1446 * fi An instance of an mpc_group fsm.
1447 * event The event, just happened.
1448 * arg Generic pointer, casted from net_device * upon call.
1450 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1452 struct net_device *dev = arg;
1453 struct ctcm_priv *priv;
1454 struct mpc_group *grp;
1455 struct channel *wch;
1456 struct channel *rch;
1458 priv = dev->ml_priv;
1460 wch = priv->channel[CTCM_WRITE];
1461 rch = priv->channel[CTCM_READ];
1463 switch (fsm_getstate(grp->fsm)) {
1464 case MPCG_STATE_XID2INITW:
1465 /* Unless there is outstanding IO on the */
1466 /* channel just return and wait for ATTN */
1467 /* interrupt to begin XID negotiations */
1468 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1469 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1471 /* Else, fall through */
1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1478 CTCM_FUNTAIL, dev->name);
1483 * MPC Group Station FSM action
1484 * CTCM_PROTO_MPC only
1486 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1488 struct mpcg_info *mpcginfo = arg;
1489 struct channel *ch = mpcginfo->ch;
1490 struct net_device *dev;
1491 struct ctcm_priv *priv;
1492 struct mpc_group *grp;
1497 priv = dev->ml_priv;
1499 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1501 CTCM_FUNTAIL, dev->name, ch->id);
1503 grp->send_qllc_disc = 1;
1504 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1513 * MPC Group Station - not part of FSM
1514 * CTCM_PROTO_MPC only
1515 * called from add_channel in ctcm_main.c
1517 void mpc_action_send_discontact(unsigned long thischan)
1520 struct channel *ch = (struct channel *)thischan;
1521 unsigned long saveflags = 0;
1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1525 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1528 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1536 * helper function of mpc FSM
1537 * CTCM_PROTO_MPC only
1538 * mpc_action_rcvd_xid7
1540 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1542 struct channel *ch = mpcginfo->ch;
1543 struct net_device *dev = ch->netdev;
1544 struct ctcm_priv *priv = dev->ml_priv;
1545 struct mpc_group *grp = priv->mpcg;
1546 struct xid2 *xid = mpcginfo->xid;
1550 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1552 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1556 /* XID REJECTED: xid == NULL */
1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1558 "%s(%s): xid = NULL",
1559 CTCM_FUNTAIL, ch->id);
1563 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1565 /*the received direction should be the opposite of ours */
1566 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1567 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1569 /* XID REJECTED: r/w channel pairing mismatch */
1570 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1571 "%s(%s): r/w channel pairing mismatch",
1572 CTCM_FUNTAIL, ch->id);
1576 if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1577 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1578 grp->group_max_buflen, xid->xid2_buf_len);
1580 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1581 xid->xid2_buf_len - len)
1582 grp->group_max_buflen = xid->xid2_buf_len - len;
1585 if (grp->saved_xid2 == NULL) {
1587 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1589 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1590 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1592 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1593 grp->rcvd_xid_skb->len = 0;
1595 /* convert two 32 bit numbers into 1 64 bit for id compare */
1596 our_id = (__u64)priv->xid->xid2_adj_id;
1597 our_id = our_id << 32;
1598 our_id = our_id + priv->xid->xid2_sender_id;
1599 their_id = (__u64)xid->xid2_adj_id;
1600 their_id = their_id << 32;
1601 their_id = their_id + xid->xid2_sender_id;
1602 /* lower id assume the xside role */
1603 if (our_id < their_id) {
1605 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1606 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1607 CTCM_FUNTAIL, ch->id);
1610 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1611 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1612 CTCM_FUNTAIL, ch->id);
1616 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1618 /* XID REJECTED: xid flag byte4 mismatch */
1619 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620 "%s(%s): xid flag byte4 mismatch",
1621 CTCM_FUNTAIL, ch->id);
1623 if (xid->xid2_flag2 == 0x40) {
1625 /* XID REJECTED - xid NOGOOD */
1626 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627 "%s(%s): xid NOGOOD",
1628 CTCM_FUNTAIL, ch->id);
1630 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1632 /* XID REJECTED - Adjacent Station ID Mismatch */
1633 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1634 "%s(%s): Adjacent Station ID Mismatch",
1635 CTCM_FUNTAIL, ch->id);
1637 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1639 /* XID REJECTED - Sender Address Mismatch */
1640 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1641 "%s(%s): Sender Address Mismatch",
1642 CTCM_FUNTAIL, ch->id);
1648 "The XID used in the MPC protocol is not valid, "
1650 priv->xid->xid2_flag2 = 0x40;
1651 grp->saved_xid2->xid2_flag2 = 0x40;
1658 * MPC Group Station FSM action
1659 * CTCM_PROTO_MPC only
1661 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1663 struct channel *ch = arg;
1666 unsigned long saveflags = 0; /* avoids compiler warning with
1667 spin_unlock_irqrestore */
1669 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1670 __func__, smp_processor_id(), ch, ch->id);
1672 if (ctcm_checkalloc_buffer(ch))
1676 * skb data-buffer referencing:
1678 ch->trans_skb->data = ch->trans_skb_data;
1679 skb_reset_tail_pointer(ch->trans_skb);
1680 ch->trans_skb->len = 0;
1681 /* result of the previous 3 statements is NOT always
1682 * already set after ctcm_checkalloc_buffer
1683 * because of possible reuse of the trans_skb
1685 memset(ch->trans_skb->data, 0, 16);
1686 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1687 /* check is main purpose here: */
1688 skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1689 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1690 /* check is main purpose here: */
1691 skb_put(ch->trans_skb, XID2_LENGTH);
1692 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1693 /* cleanup back to startpoint */
1694 ch->trans_skb->data = ch->trans_skb_data;
1695 skb_reset_tail_pointer(ch->trans_skb);
1696 ch->trans_skb->len = 0;
1698 /* non-checking rewrite of above skb data-buffer referencing: */
1700 memset(ch->trans_skb->data, 0, 16);
1701 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;
1702 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1703 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1706 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1707 ch->ccw[8].count = 0;
1708 ch->ccw[8].cda = 0x00;
1710 if (!(ch->xid_th && ch->xid && ch->xid_id))
1711 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1712 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1713 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1715 if (side == XSIDE) {
1716 /* mpc_action_xside_xid */
1717 if (ch->xid_th == NULL)
1719 ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1720 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1721 ch->ccw[9].count = TH_HEADER_LENGTH;
1722 ch->ccw[9].cda = virt_to_phys(ch->xid_th);
1724 if (ch->xid == NULL)
1726 ch->ccw[10].cmd_code = CCW_CMD_WRITE;
1727 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1728 ch->ccw[10].count = XID2_LENGTH;
1729 ch->ccw[10].cda = virt_to_phys(ch->xid);
1731 ch->ccw[11].cmd_code = CCW_CMD_READ;
1732 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1733 ch->ccw[11].count = TH_HEADER_LENGTH;
1734 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th);
1736 ch->ccw[12].cmd_code = CCW_CMD_READ;
1737 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1738 ch->ccw[12].count = XID2_LENGTH;
1739 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid);
1741 ch->ccw[13].cmd_code = CCW_CMD_READ;
1742 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id);
1744 } else { /* side == YSIDE : mpc_action_yside_xid */
1745 ch->ccw[9].cmd_code = CCW_CMD_READ;
1746 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1747 ch->ccw[9].count = TH_HEADER_LENGTH;
1748 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th);
1750 ch->ccw[10].cmd_code = CCW_CMD_READ;
1751 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1752 ch->ccw[10].count = XID2_LENGTH;
1753 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid);
1755 if (ch->xid_th == NULL)
1757 ch->ccw[11].cmd_code = CCW_CMD_WRITE;
1758 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1759 ch->ccw[11].count = TH_HEADER_LENGTH;
1760 ch->ccw[11].cda = virt_to_phys(ch->xid_th);
1762 if (ch->xid == NULL)
1764 ch->ccw[12].cmd_code = CCW_CMD_WRITE;
1765 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1766 ch->ccw[12].count = XID2_LENGTH;
1767 ch->ccw[12].cda = virt_to_phys(ch->xid);
1769 if (ch->xid_id == NULL)
1771 ch->ccw[13].cmd_code = CCW_CMD_WRITE;
1772 ch->ccw[13].cda = virt_to_phys(ch->xid_id);
1775 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1776 ch->ccw[13].count = 4;
1778 ch->ccw[14].cmd_code = CCW_CMD_NOOP;
1779 ch->ccw[14].flags = CCW_FLAG_SLI;
1780 ch->ccw[14].count = 0;
1781 ch->ccw[14].cda = 0;
1783 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1784 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1785 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1786 CTCM_D3_DUMP((char *)ch->xid_id, 4);
1789 /* Such conditional locking is a known problem for
1790 * sparse because its static undeterministic.
1791 * Warnings should be ignored here. */
1792 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1796 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1797 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1799 if (gotlock) /* see remark above about conditional locking */
1800 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1803 ctcm_ccw_check_rc(ch, rc,
1804 (side == XSIDE) ? "x-side XID" : "y-side XID");
1808 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1809 __func__, ch, ch->id);
1815 * MPC Group Station FSM action
1816 * CTCM_PROTO_MPC only
1818 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1820 mpc_action_side_xid(fsm, arg, XSIDE);
1824 * MPC Group Station FSM action
1825 * CTCM_PROTO_MPC only
1827 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1829 mpc_action_side_xid(fsm, arg, YSIDE);
1833 * MPC Group Station FSM action
1834 * CTCM_PROTO_MPC only
1836 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1838 struct channel *ch = arg;
1839 struct net_device *dev = ch->netdev;
1840 struct ctcm_priv *priv = dev->ml_priv;
1841 struct mpc_group *grp = priv->mpcg;
1843 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1844 __func__, smp_processor_id(), ch, ch->id);
1846 if (ch->xid == NULL) {
1847 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1848 "%s(%s): ch->xid == NULL",
1849 CTCM_FUNTAIL, dev->name);
1853 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1855 ch->xid->xid2_option = XID2_0;
1857 switch (fsm_getstate(grp->fsm)) {
1858 case MPCG_STATE_XID2INITW:
1859 case MPCG_STATE_XID2INITX:
1860 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1862 case MPCG_STATE_XID0IOWAIT:
1863 case MPCG_STATE_XID0IOWAIX:
1864 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1868 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1874 * MPC Group Station FSM action
1875 * CTCM_PROTO_MPC only
1877 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1879 struct net_device *dev = arg;
1880 struct ctcm_priv *priv = dev->ml_priv;
1881 struct mpc_group *grp = NULL;
1890 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1891 struct channel *ch = priv->channel[direction];
1892 struct xid2 *thisxid = ch->xid;
1893 ch->xid_skb->data = ch->xid_skb_data;
1894 skb_reset_tail_pointer(ch->xid_skb);
1895 ch->xid_skb->len = 0;
1896 thisxid->xid2_option = XID2_7;
1900 if (grp->outstanding_xid7_p2 > 0) {
1901 if (grp->roll == YSIDE) {
1902 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1903 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1904 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1905 skb_put_data(ch->xid_skb, &thdummy,
1909 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1910 fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1911 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1912 skb_put_data(ch->xid_skb, &thnorm,
1918 if (grp->roll == YSIDE) {
1919 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1920 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1921 skb_put_data(ch->xid_skb, &thnorm,
1923 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1926 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1927 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1928 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1929 skb_put_data(ch->xid_skb, &thdummy,
1936 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1943 * MPC Group Station FSM action
1944 * CTCM_PROTO_MPC only
1946 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1949 struct mpcg_info *mpcginfo = arg;
1950 struct channel *ch = mpcginfo->ch;
1951 struct net_device *dev = ch->netdev;
1952 struct ctcm_priv *priv = dev->ml_priv;
1953 struct mpc_group *grp = priv->mpcg;
1955 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1956 __func__, ch->id, grp->outstanding_xid2,
1957 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1959 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1960 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1962 grp->outstanding_xid2--;
1963 grp->outstanding_xid7++;
1964 grp->outstanding_xid7_p2++;
1966 /* must change state before validating xid to */
1967 /* properly handle interim interrupts received*/
1968 switch (fsm_getstate(grp->fsm)) {
1969 case MPCG_STATE_XID2INITW:
1970 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1971 mpc_validate_xid(mpcginfo);
1973 case MPCG_STATE_XID0IOWAIT:
1974 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1975 mpc_validate_xid(mpcginfo);
1977 case MPCG_STATE_XID2INITX:
1978 if (grp->outstanding_xid2 == 0) {
1979 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1980 mpc_validate_xid(mpcginfo);
1981 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1984 case MPCG_STATE_XID0IOWAIX:
1985 if (grp->outstanding_xid2 == 0) {
1986 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1987 mpc_validate_xid(mpcginfo);
1988 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1993 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1994 __func__, ch->id, grp->outstanding_xid2,
1995 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1996 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1998 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2005 * MPC Group Station FSM action
2006 * CTCM_PROTO_MPC only
2008 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2010 struct mpcg_info *mpcginfo = arg;
2011 struct channel *ch = mpcginfo->ch;
2012 struct net_device *dev = ch->netdev;
2013 struct ctcm_priv *priv = dev->ml_priv;
2014 struct mpc_group *grp = priv->mpcg;
2016 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2017 __func__, smp_processor_id(), ch, ch->id);
2018 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2019 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2021 grp->outstanding_xid7--;
2022 ch->xid_skb->data = ch->xid_skb_data;
2023 skb_reset_tail_pointer(ch->xid_skb);
2024 ch->xid_skb->len = 0;
2026 switch (fsm_getstate(grp->fsm)) {
2027 case MPCG_STATE_XID7INITI:
2028 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2029 mpc_validate_xid(mpcginfo);
2031 case MPCG_STATE_XID7INITW:
2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2033 mpc_validate_xid(mpcginfo);
2035 case MPCG_STATE_XID7INITZ:
2036 case MPCG_STATE_XID7INITX:
2037 if (grp->outstanding_xid7 == 0) {
2038 if (grp->outstanding_xid7_p2 > 0) {
2039 grp->outstanding_xid7 =
2040 grp->outstanding_xid7_p2;
2041 grp->outstanding_xid7_p2 = 0;
2043 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2045 mpc_validate_xid(mpcginfo);
2046 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2049 mpc_validate_xid(mpcginfo);
2056 * mpc_action helper of an MPC Group Station FSM action
2057 * CTCM_PROTO_MPC only
2059 static int mpc_send_qllc_discontact(struct net_device *dev)
2062 struct sk_buff *skb;
2063 struct qllc *qllcptr;
2064 struct ctcm_priv *priv = dev->ml_priv;
2065 struct mpc_group *grp = priv->mpcg;
2067 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2068 __func__, mpcg_state_names[grp->saved_state]);
2070 switch (grp->saved_state) {
2072 * establish conn callback function is
2073 * preferred method to report failure
2075 case MPCG_STATE_XID0IOWAIT:
2076 case MPCG_STATE_XID0IOWAIX:
2077 case MPCG_STATE_XID7INITI:
2078 case MPCG_STATE_XID7INITZ:
2079 case MPCG_STATE_XID2INITW:
2080 case MPCG_STATE_XID2INITX:
2081 case MPCG_STATE_XID7INITW:
2082 case MPCG_STATE_XID7INITX:
2083 if (grp->estconnfunc) {
2084 grp->estconnfunc(grp->port_num, -1, 0);
2085 grp->estconnfunc = NULL;
2088 /* Else, fall through */
2089 case MPCG_STATE_FLOWC:
2090 case MPCG_STATE_READY:
2091 grp->send_qllc_disc = 2;
2092 new_len = sizeof(struct qllc);
2093 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2094 if (qllcptr == NULL) {
2095 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2096 "%s(%s): qllcptr allocation error",
2097 CTCM_FUNTAIL, dev->name);
2101 qllcptr->qllc_address = 0xcc;
2102 qllcptr->qllc_commands = 0x03;
2104 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2107 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2108 "%s(%s): skb allocation error",
2109 CTCM_FUNTAIL, dev->name);
2110 priv->stats.rx_dropped++;
2115 skb_put_data(skb, qllcptr, new_len);
2118 if (skb_headroom(skb) < 4) {
2119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2120 "%s(%s): skb_headroom error",
2121 CTCM_FUNTAIL, dev->name);
2122 dev_kfree_skb_any(skb);
2126 *((__u32 *)skb_push(skb, 4)) =
2127 priv->channel[CTCM_READ]->pdu_seq;
2128 priv->channel[CTCM_READ]->pdu_seq++;
2129 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2130 __func__, priv->channel[CTCM_READ]->pdu_seq);
2132 /* receipt of CC03 resets anticipated sequence number on
2134 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2135 skb_reset_mac_header(skb);
2137 skb->protocol = htons(ETH_P_SNAP);
2138 skb->ip_summed = CHECKSUM_UNNECESSARY;
2140 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2151 /* --- This is the END my friend --- */