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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright IBM Corp. 2004, 20074 * Authors: Belinda Thompson (belindat@us.ibm.com)5 * Andy Richter (richtera@us.ibm.com)6 * Peter Tiedemann (ptiedem@de.ibm.com)7 */8 9/*10 This module exports functions to be used by CCS:11 EXPORT_SYMBOL(ctc_mpc_alloc_channel);12 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);13 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);14 EXPORT_SYMBOL(ctc_mpc_flow_control);15*/16 17#undef DEBUG18#undef DEBUGDATA19#undef DEBUGCCW20 21#define KMSG_COMPONENT "ctcm"22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt23 24#include <linux/module.h>25#include <linux/init.h>26#include <linux/kernel.h>27#include <linux/slab.h>28#include <linux/errno.h>29#include <linux/types.h>30#include <linux/interrupt.h>31#include <linux/timer.h>32#include <linux/sched.h>33 34#include <linux/signal.h>35#include <linux/string.h>36#include <linux/proc_fs.h>37 38#include <linux/ip.h>39#include <linux/if_arp.h>40#include <linux/tcp.h>41#include <linux/skbuff.h>42#include <linux/ctype.h>43#include <linux/netdevice.h>44#include <net/dst.h>45 46#include <linux/io.h>47#include <linux/bitops.h>48#include <linux/uaccess.h>49#include <linux/wait.h>50#include <linux/moduleparam.h>51#include <asm/ccwdev.h>52#include <asm/ccwgroup.h>53#include <asm/idals.h>54 55#include "ctcm_main.h"56#include "ctcm_mpc.h"57#include "ctcm_fsms.h"58 59static const struct xid2 init_xid = {60 .xid2_type_id = XID_FM2,61 .xid2_len = 0x45,62 .xid2_adj_id = 0,63 .xid2_rlen = 0x31,64 .xid2_resv1 = 0,65 .xid2_flag1 = 0,66 .xid2_fmtt = 0,67 .xid2_flag4 = 0x80,68 .xid2_resv2 = 0,69 .xid2_tgnum = 0,70 .xid2_sender_id = 0,71 .xid2_flag2 = 0,72 .xid2_option = XID2_0,73 .xid2_resv3 = "\x00",74 .xid2_resv4 = 0,75 .xid2_dlc_type = XID2_READ_SIDE,76 .xid2_resv5 = 0,77 .xid2_mpc_flag = 0,78 .xid2_resv6 = 0,79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35),80};81 82static const struct th_header thnorm = {83 .th_seg = 0x00,84 .th_ch_flag = TH_IS_XID,85 .th_blk_flag = TH_DATA_IS_XID,86 .th_is_xid = 0x01,87 .th_seq_num = 0x00000000,88};89 90static const struct th_header thdummy = {91 .th_seg = 0x00,92 .th_ch_flag = 0x00,93 .th_blk_flag = TH_DATA_IS_XID,94 .th_is_xid = 0x01,95 .th_seq_num = 0x00000000,96};97 98/*99 * Definition of one MPC group100 */101 102/*103 * Compatibility macros for busy handling104 * of network devices.105 */106 107static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);108 109/*110 * MPC Group state machine actions (static prototypes)111 */112static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);113static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);114static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);115static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);116static int mpc_validate_xid(struct mpcg_info *mpcginfo);117static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);118static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);119static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);120static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);121static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);122static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);123 124#ifdef DEBUGDATA125/*-------------------------------------------------------------------*126* Dump buffer format *127* *128*--------------------------------------------------------------------*/129void ctcmpc_dumpit(char *buf, int len)130{131 __u32 ct, sw, rm, dup;132 char *ptr, *rptr;133 char tbuf[82], tdup[82];134 char addr[22];135 char boff[12];136 char bhex[82], duphex[82];137 char basc[40];138 139 sw = 0;140 rptr = ptr = buf;141 rm = 16;142 duphex[0] = 0x00;143 dup = 0;144 145 for (ct = 0; ct < len; ct++, ptr++, rptr++) {146 if (sw == 0) {147 scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr);148 149 scnprintf(boff, sizeof(boff), "%4.4X", (__u32)ct);150 bhex[0] = '\0';151 basc[0] = '\0';152 }153 if ((sw == 4) || (sw == 12))154 strcat(bhex, " ");155 if (sw == 8)156 strcat(bhex, " ");157 158 scnprintf(tbuf, sizeof(tbuf), "%2.2llX", (__u64)*ptr);159 160 tbuf[2] = '\0';161 strcat(bhex, tbuf);162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))163 basc[sw] = *ptr;164 else165 basc[sw] = '.';166 167 basc[sw+1] = '\0';168 sw++;169 rm--;170 if (sw != 16)171 continue;172 if ((strcmp(duphex, bhex)) != 0) {173 if (dup != 0) {174 scnprintf(tdup, sizeof(tdup),175 "Duplicate as above to %s", addr);176 ctcm_pr_debug(" --- %s ---\n",177 tdup);178 }179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",180 addr, boff, bhex, basc);181 dup = 0;182 strcpy(duphex, bhex);183 } else184 dup++;185 186 sw = 0;187 rm = 16;188 } /* endfor */189 190 if (sw != 0) {191 for ( ; rm > 0; rm--, sw++) {192 if ((sw == 4) || (sw == 12))193 strcat(bhex, " ");194 if (sw == 8)195 strcat(bhex, " ");196 strcat(bhex, " ");197 strcat(basc, " ");198 }199 if (dup != 0) {200 scnprintf(tdup, sizeof(tdup),201 "Duplicate as above to %s", addr);202 ctcm_pr_debug(" --- %s ---\n", tdup);203 }204 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",205 addr, boff, bhex, basc);206 } else {207 if (dup >= 1) {208 scnprintf(tdup, sizeof(tdup),209 "Duplicate as above to %s", addr);210 ctcm_pr_debug(" --- %s ---\n", tdup);211 }212 if (dup != 0) {213 ctcm_pr_debug(" %s (+%s) : %s [%s]\n",214 addr, boff, bhex, basc);215 }216 }217 218 return;219 220} /* end of ctcmpc_dumpit */221#endif222 223#ifdef DEBUGDATA224/*225 * Dump header and first 16 bytes of an sk_buff for debugging purposes.226 *227 * skb The sk_buff to dump.228 * offset Offset relative to skb-data, where to start the dump.229 */230void ctcmpc_dump_skb(struct sk_buff *skb, int offset)231{232 __u8 *p = skb->data;233 struct th_header *header;234 struct pdu *pheader;235 int bl = skb->len;236 int i;237 238 if (p == NULL)239 return;240 241 p += offset;242 header = (struct th_header *)p;243 244 ctcm_pr_debug("dump:\n");245 ctcm_pr_debug("skb len=%d \n", skb->len);246 if (skb->len > 2) {247 switch (header->th_ch_flag) {248 case TH_HAS_PDU:249 break;250 case 0x00:251 case TH_IS_XID:252 if ((header->th_blk_flag == TH_DATA_IS_XID) &&253 (header->th_is_xid == 0x01))254 goto dumpth;255 case TH_SWEEP_REQ:256 goto dumpth;257 case TH_SWEEP_RESP:258 goto dumpth;259 default:260 break;261 }262 263 pheader = (struct pdu *)p;264 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",265 pheader->pdu_offset, pheader->pdu_offset);266 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag);267 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);268 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq);269 goto dumpdata;270 271dumpth:272 ctcm_pr_debug("th->seg : %02x\n", header->th_seg);273 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag);274 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);275 ctcm_pr_debug("th->type : %s\n",276 (header->th_is_xid) ? "DATA" : "XID");277 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num);278 279 }280dumpdata:281 if (bl > 32)282 bl = 32;283 ctcm_pr_debug("data: ");284 for (i = 0; i < bl; i++)285 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");286 ctcm_pr_debug("\n");287}288#endif289 290static struct net_device *ctcmpc_get_dev(int port_num)291{292 char device[20];293 struct net_device *dev;294 struct ctcm_priv *priv;295 296 scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num);297 298 dev = __dev_get_by_name(&init_net, device);299 300 if (dev == NULL) {301 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,302 "%s: Device not found by name: %s",303 CTCM_FUNTAIL, device);304 return NULL;305 }306 priv = dev->ml_priv;307 if (priv == NULL) {308 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,309 "%s(%s): dev->ml_priv is NULL",310 CTCM_FUNTAIL, device);311 return NULL;312 }313 if (priv->mpcg == NULL) {314 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,315 "%s(%s): priv->mpcg is NULL",316 CTCM_FUNTAIL, device);317 return NULL;318 }319 return dev;320}321 322/*323 * ctc_mpc_alloc_channel324 * (exported interface)325 *326 * Device Initialization :327 * ACTPATH driven IO operations328 */329int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))330{331 struct net_device *dev;332 struct mpc_group *grp;333 struct ctcm_priv *priv;334 335 dev = ctcmpc_get_dev(port_num);336 if (dev == NULL)337 return 1;338 priv = dev->ml_priv;339 grp = priv->mpcg;340 341 grp->allochanfunc = callback;342 grp->port_num = port_num;343 grp->port_persist = 1;344 345 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,346 "%s(%s): state=%s",347 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));348 349 switch (fsm_getstate(grp->fsm)) {350 case MPCG_STATE_INOP:351 /* Group is in the process of terminating */352 grp->alloc_called = 1;353 break;354 case MPCG_STATE_RESET:355 /* MPC Group will transition to state */356 /* MPCG_STATE_XID2INITW iff the minimum number */357 /* of 1 read and 1 write channel have successfully*/358 /* activated */359 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/360 if (callback)361 grp->send_qllc_disc = 1;362 fallthrough;363 case MPCG_STATE_XID0IOWAIT:364 fsm_deltimer(&grp->timer);365 grp->outstanding_xid2 = 0;366 grp->outstanding_xid7 = 0;367 grp->outstanding_xid7_p2 = 0;368 grp->saved_xid2 = NULL;369 if (callback)370 ctcm_open(dev);371 fsm_event(priv->fsm, DEV_EVENT_START, dev);372 break;373 case MPCG_STATE_READY:374 /* XID exchanges completed after PORT was activated */375 /* Link station already active */376 /* Maybe timing issue...retry callback */377 grp->allocchan_callback_retries++;378 if (grp->allocchan_callback_retries < 4) {379 if (grp->allochanfunc)380 grp->allochanfunc(grp->port_num,381 grp->group_max_buflen);382 } else {383 /* there are problems...bail out */384 /* there may be a state mismatch so restart */385 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);386 grp->allocchan_callback_retries = 0;387 }388 break;389 }390 391 return 0;392}393EXPORT_SYMBOL(ctc_mpc_alloc_channel);394 395/*396 * ctc_mpc_establish_connectivity397 * (exported interface)398 */399void ctc_mpc_establish_connectivity(int port_num,400 void (*callback)(int, int, int))401{402 struct net_device *dev;403 struct mpc_group *grp;404 struct ctcm_priv *priv;405 struct channel *rch, *wch;406 407 dev = ctcmpc_get_dev(port_num);408 if (dev == NULL)409 return;410 priv = dev->ml_priv;411 grp = priv->mpcg;412 rch = priv->channel[CTCM_READ];413 wch = priv->channel[CTCM_WRITE];414 415 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,416 "%s(%s): state=%s",417 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));418 419 grp->estconnfunc = callback;420 grp->port_num = port_num;421 422 switch (fsm_getstate(grp->fsm)) {423 case MPCG_STATE_READY:424 /* XID exchanges completed after PORT was activated */425 /* Link station already active */426 /* Maybe timing issue...retry callback */427 fsm_deltimer(&grp->timer);428 grp->estconn_callback_retries++;429 if (grp->estconn_callback_retries < 4) {430 if (grp->estconnfunc) {431 grp->estconnfunc(grp->port_num, 0,432 grp->group_max_buflen);433 grp->estconnfunc = NULL;434 }435 } else {436 /* there are problems...bail out */437 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);438 grp->estconn_callback_retries = 0;439 }440 break;441 case MPCG_STATE_INOP:442 case MPCG_STATE_RESET:443 /* MPC Group is not ready to start XID - min num of */444 /* 1 read and 1 write channel have not been acquired*/445 446 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,447 "%s(%s): REJECTED - inactive channels",448 CTCM_FUNTAIL, dev->name);449 if (grp->estconnfunc) {450 grp->estconnfunc(grp->port_num, -1, 0);451 grp->estconnfunc = NULL;452 }453 break;454 case MPCG_STATE_XID2INITW:455 /* alloc channel was called but no XID exchange */456 /* has occurred. initiate xside XID exchange */457 /* make sure yside XID0 processing has not started */458 459 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||460 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {461 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,462 "%s(%s): ABORT - PASSIVE XID",463 CTCM_FUNTAIL, dev->name);464 break;465 }466 grp->send_qllc_disc = 1;467 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);468 fsm_deltimer(&grp->timer);469 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,470 MPCG_EVENT_TIMER, dev);471 grp->outstanding_xid7 = 0;472 grp->outstanding_xid7_p2 = 0;473 grp->saved_xid2 = NULL;474 if ((rch->in_mpcgroup) &&475 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))476 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);477 else {478 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,479 "%s(%s): RX-%s not ready for ACTIVE XID0",480 CTCM_FUNTAIL, dev->name, rch->id);481 if (grp->estconnfunc) {482 grp->estconnfunc(grp->port_num, -1, 0);483 grp->estconnfunc = NULL;484 }485 fsm_deltimer(&grp->timer);486 goto done;487 }488 if ((wch->in_mpcgroup) &&489 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))490 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);491 else {492 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,493 "%s(%s): WX-%s not ready for ACTIVE XID0",494 CTCM_FUNTAIL, dev->name, wch->id);495 if (grp->estconnfunc) {496 grp->estconnfunc(grp->port_num, -1, 0);497 grp->estconnfunc = NULL;498 }499 fsm_deltimer(&grp->timer);500 goto done;501 }502 break;503 case MPCG_STATE_XID0IOWAIT:504 /* already in active XID negotiations */505 default:506 break;507 }508 509done:510 CTCM_PR_DEBUG("Exit %s()\n", __func__);511 return;512}513EXPORT_SYMBOL(ctc_mpc_establish_connectivity);514 515/*516 * ctc_mpc_dealloc_ch517 * (exported interface)518 */519void ctc_mpc_dealloc_ch(int port_num)520{521 struct net_device *dev;522 struct ctcm_priv *priv;523 struct mpc_group *grp;524 525 dev = ctcmpc_get_dev(port_num);526 if (dev == NULL)527 return;528 priv = dev->ml_priv;529 grp = priv->mpcg;530 531 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,532 "%s: %s: refcount = %d\n",533 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));534 535 fsm_deltimer(&priv->restart_timer);536 grp->channels_terminating = 0;537 fsm_deltimer(&grp->timer);538 grp->allochanfunc = NULL;539 grp->estconnfunc = NULL;540 grp->port_persist = 0;541 grp->send_qllc_disc = 0;542 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);543 544 ctcm_close(dev);545 return;546}547EXPORT_SYMBOL(ctc_mpc_dealloc_ch);548 549/*550 * ctc_mpc_flow_control551 * (exported interface)552 */553void ctc_mpc_flow_control(int port_num, int flowc)554{555 struct ctcm_priv *priv;556 struct mpc_group *grp;557 struct net_device *dev;558 struct channel *rch;559 int mpcg_state;560 561 dev = ctcmpc_get_dev(port_num);562 if (dev == NULL)563 return;564 priv = dev->ml_priv;565 grp = priv->mpcg;566 567 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,568 "%s: %s: flowc = %d",569 CTCM_FUNTAIL, dev->name, flowc);570 571 rch = priv->channel[CTCM_READ];572 573 mpcg_state = fsm_getstate(grp->fsm);574 switch (flowc) {575 case 1:576 if (mpcg_state == MPCG_STATE_FLOWC)577 break;578 if (mpcg_state == MPCG_STATE_READY) {579 if (grp->flow_off_called == 1)580 grp->flow_off_called = 0;581 else582 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);583 break;584 }585 break;586 case 0:587 if (mpcg_state == MPCG_STATE_FLOWC) {588 fsm_newstate(grp->fsm, MPCG_STATE_READY);589 /* ensure any data that has accumulated */590 /* on the io_queue will now be sen t */591 tasklet_schedule(&rch->ch_tasklet);592 }593 /* possible race condition */594 if (mpcg_state == MPCG_STATE_READY) {595 grp->flow_off_called = 1;596 break;597 }598 break;599 }600 601}602EXPORT_SYMBOL(ctc_mpc_flow_control);603 604static int mpc_send_qllc_discontact(struct net_device *);605 606/*607 * helper function of ctcmpc_unpack_skb608*/609static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)610{611 struct channel *rch = mpcginfo->ch;612 struct net_device *dev = rch->netdev;613 struct ctcm_priv *priv = dev->ml_priv;614 struct mpc_group *grp = priv->mpcg;615 struct channel *ch = priv->channel[CTCM_WRITE];616 617 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);618 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);619 620 grp->sweep_rsp_pend_num--;621 622 if ((grp->sweep_req_pend_num == 0) &&623 (grp->sweep_rsp_pend_num == 0)) {624 fsm_deltimer(&ch->sweep_timer);625 grp->in_sweep = 0;626 rch->th_seq_num = 0x00;627 ch->th_seq_num = 0x00;628 ctcm_clear_busy_do(dev);629 }630 631 return;632 633}634 635/*636 * helper function of mpc_rcvd_sweep_req637 * which is a helper of ctcmpc_unpack_skb638 */639static void ctcmpc_send_sweep_resp(struct channel *rch)640{641 struct net_device *dev = rch->netdev;642 struct ctcm_priv *priv = dev->ml_priv;643 struct mpc_group *grp = priv->mpcg;644 struct th_sweep *header;645 struct sk_buff *sweep_skb;646 struct channel *ch = priv->channel[CTCM_WRITE];647 648 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);649 650 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);651 if (sweep_skb == NULL) {652 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,653 "%s(%s): sweep_skb allocation ERROR\n",654 CTCM_FUNTAIL, rch->id);655 goto done;656 }657 658 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);659 header->th.th_ch_flag = TH_SWEEP_RESP;660 header->sw.th_last_seq = ch->th_seq_num;661 662 netif_trans_update(dev);663 skb_queue_tail(&ch->sweep_queue, sweep_skb);664 665 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);666 667 return;668 669done:670 grp->in_sweep = 0;671 ctcm_clear_busy_do(dev);672 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);673 674 return;675}676 677/*678 * helper function of ctcmpc_unpack_skb679 */680static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)681{682 struct channel *rch = mpcginfo->ch;683 struct net_device *dev = rch->netdev;684 struct ctcm_priv *priv = dev->ml_priv;685 struct mpc_group *grp = priv->mpcg;686 struct channel *ch = priv->channel[CTCM_WRITE];687 688 if (do_debug)689 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,690 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);691 692 if (grp->in_sweep == 0) {693 grp->in_sweep = 1;694 ctcm_test_and_set_busy(dev);695 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];696 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];697 }698 699 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);700 701 grp->sweep_req_pend_num--;702 ctcmpc_send_sweep_resp(ch);703 kfree(mpcginfo);704 return;705}706 707/*708 * MPC Group Station FSM definitions709 */710static const char *mpcg_event_names[] = {711 [MPCG_EVENT_INOP] = "INOP Condition",712 [MPCG_EVENT_DISCONC] = "Discontact Received",713 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",714 [MPCG_EVENT_XID2] = "XID2 Received",715 [MPCG_EVENT_XID2DONE] = "XID0 Complete",716 [MPCG_EVENT_XID7DONE] = "XID7 Complete",717 [MPCG_EVENT_TIMER] = "XID Setup Timer",718 [MPCG_EVENT_DOIO] = "XID DoIO",719};720 721static const char *mpcg_state_names[] = {722 [MPCG_STATE_RESET] = "Reset",723 [MPCG_STATE_INOP] = "INOP",724 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start",725 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete",726 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start",727 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete",728 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start",729 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete",730 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start",731 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ",732 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ",733 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON",734 [MPCG_STATE_READY] = "READY",735};736 737/*738 * The MPC Group Station FSM739 * 22 events740 */741static const fsm_node mpcg_fsm[] = {742 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop },743 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop },744 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop },745 746 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },747 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop },748 749 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 },750 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },751 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop },752 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout },753 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },754 755 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },756 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },757 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop },758 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout },759 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },760 761 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },762 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },763 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },764 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop },765 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout },766 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },767 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid },768 769 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },770 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },771 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop },772 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },773 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout },774 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid },775 776 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 },777 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact },778 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },779 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop },780 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout },781 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid },782 783 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 },784 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact },785 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 },786 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop },787 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout },788 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid },789 790 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 },791 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },792 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },793 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop },794 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout },795 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },796 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid },797 798 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 },799 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 },800 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },801 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop },802 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout },803 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid },804 805 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop },806 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready },807};808 809static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);810 811/*812 * MPC Group Station FSM action813 * CTCM_PROTO_MPC only814 */815static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)816{817 struct net_device *dev = arg;818 struct ctcm_priv *priv = dev->ml_priv;819 struct mpc_group *grp = priv->mpcg;820 821 if (grp == NULL) {822 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,823 "%s(%s): No MPC group",824 CTCM_FUNTAIL, dev->name);825 return;826 }827 828 fsm_deltimer(&grp->timer);829 830 if (grp->saved_xid2->xid2_flag2 == 0x40) {831 priv->xid->xid2_flag2 = 0x00;832 if (grp->estconnfunc) {833 grp->estconnfunc(grp->port_num, 1,834 grp->group_max_buflen);835 grp->estconnfunc = NULL;836 } else if (grp->allochanfunc)837 grp->send_qllc_disc = 1;838 839 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);840 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,841 "%s(%s): fails",842 CTCM_FUNTAIL, dev->name);843 return;844 }845 846 grp->port_persist = 1;847 grp->out_of_sequence = 0;848 grp->estconn_called = 0;849 850 tasklet_hi_schedule(&grp->mpc_tasklet2);851 852 return;853}854 855/*856 * helper of ctcm_init_netdevice857 * CTCM_PROTO_MPC only858 */859void mpc_group_ready(unsigned long adev)860{861 struct net_device *dev = (struct net_device *)adev;862 struct ctcm_priv *priv = dev->ml_priv;863 struct mpc_group *grp = priv->mpcg;864 struct channel *ch = NULL;865 866 if (grp == NULL) {867 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,868 "%s(%s): No MPC group",869 CTCM_FUNTAIL, dev->name);870 return;871 }872 873 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,874 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",875 CTCM_FUNTAIL, dev->name, grp->group_max_buflen);876 877 fsm_newstate(grp->fsm, MPCG_STATE_READY);878 879 /* Put up a read on the channel */880 ch = priv->channel[CTCM_READ];881 ch->pdu_seq = 0;882 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,883 __func__, ch->pdu_seq);884 885 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);886 /* Put the write channel in idle state */887 ch = priv->channel[CTCM_WRITE];888 if (ch->collect_len > 0) {889 spin_lock(&ch->collect_lock);890 ctcm_purge_skb_queue(&ch->collect_queue);891 ch->collect_len = 0;892 spin_unlock(&ch->collect_lock);893 }894 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);895 ctcm_clear_busy(dev);896 897 if (grp->estconnfunc) {898 grp->estconnfunc(grp->port_num, 0,899 grp->group_max_buflen);900 grp->estconnfunc = NULL;901 } else if (grp->allochanfunc) {902 grp->allochanfunc(grp->port_num, grp->group_max_buflen);903 }904 905 grp->send_qllc_disc = 1;906 grp->changed_side = 0;907 908 return;909 910}911 912/*913 * Increment the MPC Group Active Channel Counts914 * helper of dev_action (called from channel fsm)915 */916void mpc_channel_action(struct channel *ch, int direction, int action)917{918 struct net_device *dev = ch->netdev;919 struct ctcm_priv *priv = dev->ml_priv;920 struct mpc_group *grp = priv->mpcg;921 922 if (grp == NULL) {923 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,924 "%s(%s): No MPC group",925 CTCM_FUNTAIL, dev->name);926 return;927 }928 929 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);930 931 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,932 "%s: %i / Grp:%s total_channels=%i, active_channels: "933 "read=%i, write=%i\n", __func__, action,934 fsm_getstate_str(grp->fsm), grp->num_channel_paths,935 grp->active_channels[CTCM_READ],936 grp->active_channels[CTCM_WRITE]);937 938 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {939 grp->num_channel_paths++;940 grp->active_channels[direction]++;941 grp->outstanding_xid2++;942 ch->in_mpcgroup = 1;943 944 if (ch->xid_skb != NULL)945 dev_kfree_skb_any(ch->xid_skb);946 947 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,948 GFP_ATOMIC | GFP_DMA);949 if (ch->xid_skb == NULL) {950 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,951 "%s(%s): Couldn't alloc ch xid_skb\n",952 CTCM_FUNTAIL, dev->name);953 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);954 return;955 }956 ch->xid_skb_data = ch->xid_skb->data;957 ch->xid_th = (struct th_header *)ch->xid_skb->data;958 skb_put(ch->xid_skb, TH_HEADER_LENGTH);959 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);960 skb_put(ch->xid_skb, XID2_LENGTH);961 ch->xid_id = skb_tail_pointer(ch->xid_skb);962 ch->xid_skb->data = ch->xid_skb_data;963 skb_reset_tail_pointer(ch->xid_skb);964 ch->xid_skb->len = 0;965 966 skb_put_data(ch->xid_skb, grp->xid_skb->data,967 grp->xid_skb->len);968 969 ch->xid->xid2_dlc_type =970 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)971 ? XID2_READ_SIDE : XID2_WRITE_SIDE);972 973 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)974 ch->xid->xid2_buf_len = 0x00;975 976 ch->xid_skb->data = ch->xid_skb_data;977 skb_reset_tail_pointer(ch->xid_skb);978 ch->xid_skb->len = 0;979 980 fsm_newstate(ch->fsm, CH_XID0_PENDING);981 982 if ((grp->active_channels[CTCM_READ] > 0) &&983 (grp->active_channels[CTCM_WRITE] > 0) &&984 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {985 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);986 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,987 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",988 __func__, dev->name);989 }990 } else if ((action == MPC_CHANNEL_REMOVE) &&991 (ch->in_mpcgroup == 1)) {992 ch->in_mpcgroup = 0;993 grp->num_channel_paths--;994 grp->active_channels[direction]--;995 996 if (ch->xid_skb != NULL)997 dev_kfree_skb_any(ch->xid_skb);998 ch->xid_skb = NULL;999 1000 if (grp->channels_terminating)1001 goto done;1002 1003 if (((grp->active_channels[CTCM_READ] == 0) &&1004 (grp->active_channels[CTCM_WRITE] > 0))1005 || ((grp->active_channels[CTCM_WRITE] == 0) &&1006 (grp->active_channels[CTCM_READ] > 0)))1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1008 }1009done:1010 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,1011 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "1012 "read=%i, write=%i\n", __func__, action,1013 fsm_getstate_str(grp->fsm), grp->num_channel_paths,1014 grp->active_channels[CTCM_READ],1015 grp->active_channels[CTCM_WRITE]);1016 1017 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);1018}1019 1020/*1021 * Unpack a just received skb and hand it over to1022 * upper layers.1023 * special MPC version of unpack_skb.1024 *1025 * ch The channel where this skb has been received.1026 * pskb The received skb.1027 */1028static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)1029{1030 struct net_device *dev = ch->netdev;1031 struct ctcm_priv *priv = dev->ml_priv;1032 struct mpc_group *grp = priv->mpcg;1033 struct pdu *curr_pdu;1034 struct mpcg_info *mpcginfo;1035 struct th_header *header = NULL;1036 struct th_sweep *sweep = NULL;1037 int pdu_last_seen = 0;1038 __u32 new_len;1039 struct sk_buff *skb;1040 int skblen;1041 int sendrc = 0;1042 1043 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",1044 __func__, dev->name, smp_processor_id(), ch->id);1045 1046 header = (struct th_header *)pskb->data;1047 if ((header->th_seg == 0) &&1048 (header->th_ch_flag == 0) &&1049 (header->th_blk_flag == 0) &&1050 (header->th_seq_num == 0))1051 /* nothing for us */ goto done;1052 1053 CTCM_PR_DBGDATA("%s: th_header\n", __func__);1054 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);1055 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);1056 1057 pskb->dev = dev;1058 pskb->ip_summed = CHECKSUM_UNNECESSARY;1059 skb_pull(pskb, TH_HEADER_LENGTH);1060 1061 if (likely(header->th_ch_flag == TH_HAS_PDU)) {1062 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);1063 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||1064 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&1065 (header->th_seq_num != ch->th_seq_num + 1) &&1066 (ch->th_seq_num != 0))) {1067 /* This is NOT the next segment *1068 * we are not the correct race winner *1069 * go away and let someone else win *1070 * BUT..this only applies if xid negot *1071 * is done *1072 */1073 grp->out_of_sequence += 1;1074 __skb_push(pskb, TH_HEADER_LENGTH);1075 skb_queue_tail(&ch->io_queue, pskb);1076 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "1077 "got:%08x\n", __func__,1078 ch->th_seq_num + 1, header->th_seq_num);1079 1080 return;1081 }1082 grp->out_of_sequence = 0;1083 ch->th_seq_num = header->th_seq_num;1084 1085 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",1086 __func__, ch->th_seq_num);1087 1088 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))1089 goto done;1090 while ((pskb->len > 0) && !pdu_last_seen) {1091 curr_pdu = (struct pdu *)pskb->data;1092 1093 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);1094 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);1095 CTCM_PR_DBGDATA("%s: pskb len: %04x \n",1096 __func__, pskb->len);1097 1098 skb_pull(pskb, PDU_HEADER_LENGTH);1099 1100 if (curr_pdu->pdu_flag & PDU_LAST)1101 pdu_last_seen = 1;1102 if (curr_pdu->pdu_flag & PDU_CNTL)1103 pskb->protocol = htons(ETH_P_SNAP);1104 else1105 pskb->protocol = htons(ETH_P_SNA_DIX);1106 1107 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {1108 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1109 "%s(%s): Dropping packet with "1110 "illegal siize %d",1111 CTCM_FUNTAIL, dev->name, pskb->len);1112 1113 priv->stats.rx_dropped++;1114 priv->stats.rx_length_errors++;1115 goto done;1116 }1117 skb_reset_mac_header(pskb);1118 new_len = curr_pdu->pdu_offset;1119 CTCM_PR_DBGDATA("%s: new_len: %04x \n",1120 __func__, new_len);1121 if ((new_len == 0) || (new_len > pskb->len)) {1122 /* should never happen */1123 /* pskb len must be hosed...bail out */1124 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1125 "%s(%s): non valid pdu_offset: %04x",1126 /* "data may be lost", */1127 CTCM_FUNTAIL, dev->name, new_len);1128 goto done;1129 }1130 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);1131 1132 if (!skb) {1133 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1134 "%s(%s): MEMORY allocation error",1135 CTCM_FUNTAIL, dev->name);1136 priv->stats.rx_dropped++;1137 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1138 goto done;1139 }1140 skb_put_data(skb, pskb->data, new_len);1141 1142 skb_reset_mac_header(skb);1143 skb->dev = pskb->dev;1144 skb->protocol = pskb->protocol;1145 skb->ip_summed = CHECKSUM_UNNECESSARY;1146 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;1147 ch->pdu_seq++;1148 1149 if (do_debug_data) {1150 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",1151 __func__, ch->pdu_seq);1152 ctcm_pr_debug("%s: skb:%0lx "1153 "skb len: %d \n", __func__,1154 (unsigned long)skb, skb->len);1155 ctcm_pr_debug("%s: up to 32 bytes "1156 "of pdu_data sent\n", __func__);1157 ctcmpc_dump32((char *)skb->data, skb->len);1158 }1159 1160 skblen = skb->len;1161 sendrc = netif_rx(skb);1162 priv->stats.rx_packets++;1163 priv->stats.rx_bytes += skblen;1164 skb_pull(pskb, new_len); /* point to next PDU */1165 }1166 } else {1167 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);1168 if (mpcginfo == NULL)1169 goto done;1170 1171 mpcginfo->ch = ch;1172 mpcginfo->th = header;1173 mpcginfo->skb = pskb;1174 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",1175 __func__);1176 /* it's a sweep? */1177 sweep = (struct th_sweep *)pskb->data;1178 mpcginfo->sweep = sweep;1179 if (header->th_ch_flag == TH_SWEEP_REQ)1180 mpc_rcvd_sweep_req(mpcginfo);1181 else if (header->th_ch_flag == TH_SWEEP_RESP)1182 mpc_rcvd_sweep_resp(mpcginfo);1183 else if (header->th_blk_flag == TH_DATA_IS_XID) {1184 struct xid2 *thisxid = (struct xid2 *)pskb->data;1185 skb_pull(pskb, XID2_LENGTH);1186 mpcginfo->xid = thisxid;1187 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);1188 } else if (header->th_blk_flag == TH_DISCONTACT)1189 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);1190 else if (header->th_seq_num != 0) {1191 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1192 "%s(%s): control pkt expected\n",1193 CTCM_FUNTAIL, dev->name);1194 priv->stats.rx_dropped++;1195 /* mpcginfo only used for non-data transfers */1196 if (do_debug_data)1197 ctcmpc_dump_skb(pskb, -8);1198 }1199 kfree(mpcginfo);1200 }1201done:1202 1203 dev_kfree_skb_any(pskb);1204 if (sendrc == NET_RX_DROP) {1205 dev_warn(&dev->dev,1206 "The network backlog for %s is exceeded, "1207 "package dropped\n", __func__);1208 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1209 }1210 1211 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",1212 __func__, dev->name, ch, ch->id);1213}1214 1215/*1216 * tasklet helper for mpc's skb unpacking.1217 *1218 * ch The channel to work on.1219 * Allow flow control back pressure to occur here.1220 * Throttling back channel can result in excessive1221 * channel inactivity and system deact of channel1222 */1223void ctcmpc_bh(unsigned long thischan)1224{1225 struct channel *ch = (struct channel *)thischan;1226 struct sk_buff *skb;1227 struct net_device *dev = ch->netdev;1228 struct ctcm_priv *priv = dev->ml_priv;1229 struct mpc_group *grp = priv->mpcg;1230 1231 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n",1232 dev->name, smp_processor_id(), __func__, ch->id);1233 /* caller has requested driver to throttle back */1234 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&1235 (skb = skb_dequeue(&ch->io_queue))) {1236 ctcmpc_unpack_skb(ch, skb);1237 if (grp->out_of_sequence > 20) {1238 /* assume data loss has occurred if */1239 /* missing seq_num for extended */1240 /* period of time */1241 grp->out_of_sequence = 0;1242 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1243 break;1244 }1245 if (skb == skb_peek(&ch->io_queue))1246 break;1247 }1248 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",1249 __func__, dev->name, ch, ch->id);1250 return;1251}1252 1253/*1254 * MPC Group Initializations1255 */1256struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)1257{1258 struct mpc_group *grp;1259 1260 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,1261 "Enter %s(%p)", CTCM_FUNTAIL, priv);1262 1263 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);1264 if (grp == NULL)1265 return NULL;1266 1267 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,1268 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,1269 mpcg_fsm_len, GFP_KERNEL);1270 if (grp->fsm == NULL) {1271 kfree(grp);1272 return NULL;1273 }1274 1275 fsm_newstate(grp->fsm, MPCG_STATE_RESET);1276 fsm_settimer(grp->fsm, &grp->timer);1277 1278 grp->xid_skb =1279 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);1280 if (grp->xid_skb == NULL) {1281 kfree_fsm(grp->fsm);1282 kfree(grp);1283 return NULL;1284 }1285 /* base xid for all channels in group */1286 grp->xid_skb_data = grp->xid_skb->data;1287 grp->xid_th = (struct th_header *)grp->xid_skb->data;1288 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);1289 1290 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);1291 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);1292 grp->xid->xid2_adj_id = jiffies | 0xfff00000;1293 grp->xid->xid2_sender_id = jiffies;1294 1295 grp->xid_id = skb_tail_pointer(grp->xid_skb);1296 skb_put_data(grp->xid_skb, "VTAM", 4);1297 1298 grp->rcvd_xid_skb =1299 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);1300 if (grp->rcvd_xid_skb == NULL) {1301 kfree_fsm(grp->fsm);1302 dev_kfree_skb(grp->xid_skb);1303 kfree(grp);1304 return NULL;1305 }1306 grp->rcvd_xid_data = grp->rcvd_xid_skb->data;1307 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;1308 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);1309 grp->saved_xid2 = NULL;1310 priv->xid = grp->xid;1311 priv->mpcg = grp;1312 return grp;1313}1314 1315/*1316 * The MPC Group Station FSM1317 */1318 1319/*1320 * MPC Group Station FSM actions1321 * CTCM_PROTO_MPC only1322 */1323 1324/*1325 * NOP action for statemachines1326 */1327static void mpc_action_nop(fsm_instance *fi, int event, void *arg)1328{1329}1330 1331/*1332 * invoked when the device transitions to dev_stopped1333 * MPC will stop each individual channel if a single XID failure1334 * occurs, or will intitiate all channels be stopped if a GROUP1335 * level failure occurs.1336 */1337static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)1338{1339 struct net_device *dev = arg;1340 struct ctcm_priv *priv;1341 struct mpc_group *grp;1342 struct channel *wch;1343 1344 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);1345 1346 priv = dev->ml_priv;1347 grp = priv->mpcg;1348 grp->flow_off_called = 0;1349 fsm_deltimer(&grp->timer);1350 if (grp->channels_terminating)1351 return;1352 1353 grp->channels_terminating = 1;1354 grp->saved_state = fsm_getstate(grp->fsm);1355 fsm_newstate(grp->fsm, MPCG_STATE_INOP);1356 if (grp->saved_state > MPCG_STATE_XID7INITF)1357 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,1358 "%s(%s): MPC GROUP INOPERATIVE",1359 CTCM_FUNTAIL, dev->name);1360 if ((grp->saved_state != MPCG_STATE_RESET) ||1361 /* dealloc_channel has been called */1362 (grp->port_persist == 0))1363 fsm_deltimer(&priv->restart_timer);1364 1365 wch = priv->channel[CTCM_WRITE];1366 1367 switch (grp->saved_state) {1368 case MPCG_STATE_RESET:1369 case MPCG_STATE_INOP:1370 case MPCG_STATE_XID2INITW:1371 case MPCG_STATE_XID0IOWAIT:1372 case MPCG_STATE_XID2INITX:1373 case MPCG_STATE_XID7INITW:1374 case MPCG_STATE_XID7INITX:1375 case MPCG_STATE_XID0IOWAIX:1376 case MPCG_STATE_XID7INITI:1377 case MPCG_STATE_XID7INITZ:1378 case MPCG_STATE_XID7INITF:1379 break;1380 case MPCG_STATE_FLOWC:1381 case MPCG_STATE_READY:1382 default:1383 tasklet_hi_schedule(&wch->ch_disc_tasklet);1384 }1385 1386 grp->xid2_tgnum = 0;1387 grp->group_max_buflen = 0; /*min of all received */1388 grp->outstanding_xid2 = 0;1389 grp->outstanding_xid7 = 0;1390 grp->outstanding_xid7_p2 = 0;1391 grp->saved_xid2 = NULL;1392 grp->xidnogood = 0;1393 grp->changed_side = 0;1394 1395 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;1396 skb_reset_tail_pointer(grp->rcvd_xid_skb);1397 grp->rcvd_xid_skb->len = 0;1398 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;1399 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);1400 1401 if (grp->send_qllc_disc == 1) {1402 grp->send_qllc_disc = 0;1403 mpc_send_qllc_discontact(dev);1404 }1405 1406 /* DO NOT issue DEV_EVENT_STOP directly out of this code */1407 /* This can result in INOP of VTAM PU due to halting of */1408 /* outstanding IO which causes a sense to be returned */1409 /* Only about 3 senses are allowed and then IOS/VTAM will*/1410 /* become unreachable without manual intervention */1411 if ((grp->port_persist == 1) || (grp->alloc_called)) {1412 grp->alloc_called = 0;1413 fsm_deltimer(&priv->restart_timer);1414 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);1415 fsm_newstate(grp->fsm, MPCG_STATE_RESET);1416 if (grp->saved_state > MPCG_STATE_XID7INITF)1417 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,1418 "%s(%s): MPC GROUP RECOVERY SCHEDULED",1419 CTCM_FUNTAIL, dev->name);1420 } else {1421 fsm_deltimer(&priv->restart_timer);1422 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);1423 fsm_newstate(grp->fsm, MPCG_STATE_RESET);1424 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,1425 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",1426 CTCM_FUNTAIL, dev->name);1427 }1428}1429 1430/*1431 * Handle mpc group action timeout.1432 * MPC Group Station FSM action1433 * CTCM_PROTO_MPC only1434 *1435 * fi An instance of an mpc_group fsm.1436 * event The event, just happened.1437 * arg Generic pointer, casted from net_device * upon call.1438 */1439static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)1440{1441 struct net_device *dev = arg;1442 struct ctcm_priv *priv;1443 struct mpc_group *grp;1444 struct channel *wch;1445 struct channel *rch;1446 1447 priv = dev->ml_priv;1448 grp = priv->mpcg;1449 wch = priv->channel[CTCM_WRITE];1450 rch = priv->channel[CTCM_READ];1451 1452 switch (fsm_getstate(grp->fsm)) {1453 case MPCG_STATE_XID2INITW:1454 /* Unless there is outstanding IO on the */1455 /* channel just return and wait for ATTN */1456 /* interrupt to begin XID negotiations */1457 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&1458 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))1459 break;1460 fallthrough;1461 default:1462 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1463 }1464 1465 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,1466 "%s: dev=%s exit",1467 CTCM_FUNTAIL, dev->name);1468 return;1469}1470 1471/*1472 * MPC Group Station FSM action1473 * CTCM_PROTO_MPC only1474 */1475void mpc_action_discontact(fsm_instance *fi, int event, void *arg)1476{1477 struct mpcg_info *mpcginfo = arg;1478 struct channel *ch = mpcginfo->ch;1479 struct net_device *dev;1480 struct ctcm_priv *priv;1481 struct mpc_group *grp;1482 1483 if (ch) {1484 dev = ch->netdev;1485 if (dev) {1486 priv = dev->ml_priv;1487 if (priv) {1488 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,1489 "%s: %s: %s\n",1490 CTCM_FUNTAIL, dev->name, ch->id);1491 grp = priv->mpcg;1492 grp->send_qllc_disc = 1;1493 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);1494 }1495 }1496 }1497 1498 return;1499}1500 1501/*1502 * MPC Group Station - not part of FSM1503 * CTCM_PROTO_MPC only1504 * called from add_channel in ctcm_main.c1505 */1506void mpc_action_send_discontact(unsigned long thischan)1507{1508 int rc;1509 struct channel *ch = (struct channel *)thischan;1510 unsigned long saveflags = 0;1511 1512 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);1513 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);1514 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);1515 1516 if (rc != 0) {1517 ctcm_ccw_check_rc(ch, rc, (char *)__func__);1518 }1519 1520 return;1521}1522 1523 1524/*1525 * helper function of mpc FSM1526 * CTCM_PROTO_MPC only1527 * mpc_action_rcvd_xid71528*/1529static int mpc_validate_xid(struct mpcg_info *mpcginfo)1530{1531 struct channel *ch = mpcginfo->ch;1532 struct net_device *dev = ch->netdev;1533 struct ctcm_priv *priv = dev->ml_priv;1534 struct mpc_group *grp = priv->mpcg;1535 struct xid2 *xid = mpcginfo->xid;1536 int rc = 0;1537 __u64 our_id = 0;1538 __u64 their_id = 0;1539 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;1540 1541 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);1542 1543 if (xid == NULL) {1544 rc = 1;1545 /* XID REJECTED: xid == NULL */1546 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1547 "%s(%s): xid = NULL",1548 CTCM_FUNTAIL, ch->id);1549 goto done;1550 }1551 1552 CTCM_D3_DUMP((char *)xid, XID2_LENGTH);1553 1554 /*the received direction should be the opposite of ours */1555 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :1556 XID2_READ_SIDE) != xid->xid2_dlc_type) {1557 rc = 2;1558 /* XID REJECTED: r/w channel pairing mismatch */1559 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1560 "%s(%s): r/w channel pairing mismatch",1561 CTCM_FUNTAIL, ch->id);1562 goto done;1563 }1564 1565 if (xid->xid2_dlc_type == XID2_READ_SIDE) {1566 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,1567 grp->group_max_buflen, xid->xid2_buf_len);1568 1569 if (grp->group_max_buflen == 0 || grp->group_max_buflen >1570 xid->xid2_buf_len - len)1571 grp->group_max_buflen = xid->xid2_buf_len - len;1572 }1573 1574 if (grp->saved_xid2 == NULL) {1575 grp->saved_xid2 =1576 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);1577 1578 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);1579 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;1580 1581 skb_reset_tail_pointer(grp->rcvd_xid_skb);1582 grp->rcvd_xid_skb->len = 0;1583 1584 /* convert two 32 bit numbers into 1 64 bit for id compare */1585 our_id = (__u64)priv->xid->xid2_adj_id;1586 our_id = our_id << 32;1587 our_id = our_id + priv->xid->xid2_sender_id;1588 their_id = (__u64)xid->xid2_adj_id;1589 their_id = their_id << 32;1590 their_id = their_id + xid->xid2_sender_id;1591 /* lower id assume the xside role */1592 if (our_id < their_id) {1593 grp->roll = XSIDE;1594 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,1595 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",1596 CTCM_FUNTAIL, ch->id);1597 } else {1598 grp->roll = YSIDE;1599 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,1600 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",1601 CTCM_FUNTAIL, ch->id);1602 }1603 1604 } else {1605 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {1606 rc = 3;1607 /* XID REJECTED: xid flag byte4 mismatch */1608 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1609 "%s(%s): xid flag byte4 mismatch",1610 CTCM_FUNTAIL, ch->id);1611 }1612 if (xid->xid2_flag2 == 0x40) {1613 rc = 4;1614 /* XID REJECTED - xid NOGOOD */1615 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1616 "%s(%s): xid NOGOOD",1617 CTCM_FUNTAIL, ch->id);1618 }1619 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {1620 rc = 5;1621 /* XID REJECTED - Adjacent Station ID Mismatch */1622 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1623 "%s(%s): Adjacent Station ID Mismatch",1624 CTCM_FUNTAIL, ch->id);1625 }1626 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {1627 rc = 6;1628 /* XID REJECTED - Sender Address Mismatch */1629 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1630 "%s(%s): Sender Address Mismatch",1631 CTCM_FUNTAIL, ch->id);1632 }1633 }1634done:1635 if (rc) {1636 dev_warn(&dev->dev,1637 "The XID used in the MPC protocol is not valid, "1638 "rc = %d\n", rc);1639 priv->xid->xid2_flag2 = 0x40;1640 grp->saved_xid2->xid2_flag2 = 0x40;1641 }1642 1643 return rc;1644}1645 1646/*1647 * MPC Group Station FSM action1648 * CTCM_PROTO_MPC only1649 */1650static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)1651{1652 struct channel *ch = arg;1653 int rc = 0;1654 int gotlock = 0;1655 unsigned long saveflags = 0; /* avoids compiler warning with1656 spin_unlock_irqrestore */1657 1658 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",1659 __func__, smp_processor_id(), ch, ch->id);1660 1661 if (ctcm_checkalloc_buffer(ch))1662 goto done;1663 1664 /*1665 * skb data-buffer referencing:1666 */1667 ch->trans_skb->data = ch->trans_skb_data;1668 skb_reset_tail_pointer(ch->trans_skb);1669 ch->trans_skb->len = 0;1670 /* result of the previous 3 statements is NOT always1671 * already set after ctcm_checkalloc_buffer1672 * because of possible reuse of the trans_skb1673 */1674 memset(ch->trans_skb->data, 0, 16);1675 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;1676 /* check is main purpose here: */1677 skb_put(ch->trans_skb, TH_HEADER_LENGTH);1678 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);1679 /* check is main purpose here: */1680 skb_put(ch->trans_skb, XID2_LENGTH);1681 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);1682 /* cleanup back to startpoint */1683 ch->trans_skb->data = ch->trans_skb_data;1684 skb_reset_tail_pointer(ch->trans_skb);1685 ch->trans_skb->len = 0;1686 1687 /* non-checking rewrite of above skb data-buffer referencing: */1688 /*1689 memset(ch->trans_skb->data, 0, 16);1690 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data;1691 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);1692 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;1693 */1694 1695 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1696 ch->ccw[8].count = 0;1697 ch->ccw[8].cda = 0x00;1698 1699 if (!(ch->xid_th && ch->xid && ch->xid_id))1700 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,1701 "%s(%s): xid_th=%p, xid=%p, xid_id=%p",1702 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);1703 1704 if (side == XSIDE) {1705 /* mpc_action_xside_xid */1706 if (ch->xid_th == NULL)1707 goto done;1708 ch->ccw[9].cmd_code = CCW_CMD_WRITE;1709 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1710 ch->ccw[9].count = TH_HEADER_LENGTH;1711 ch->ccw[9].cda = virt_to_dma32(ch->xid_th);1712 1713 if (ch->xid == NULL)1714 goto done;1715 ch->ccw[10].cmd_code = CCW_CMD_WRITE;1716 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1717 ch->ccw[10].count = XID2_LENGTH;1718 ch->ccw[10].cda = virt_to_dma32(ch->xid);1719 1720 ch->ccw[11].cmd_code = CCW_CMD_READ;1721 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1722 ch->ccw[11].count = TH_HEADER_LENGTH;1723 ch->ccw[11].cda = virt_to_dma32(ch->rcvd_xid_th);1724 1725 ch->ccw[12].cmd_code = CCW_CMD_READ;1726 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1727 ch->ccw[12].count = XID2_LENGTH;1728 ch->ccw[12].cda = virt_to_dma32(ch->rcvd_xid);1729 1730 ch->ccw[13].cmd_code = CCW_CMD_READ;1731 ch->ccw[13].cda = virt_to_dma32(ch->rcvd_xid_id);1732 1733 } else { /* side == YSIDE : mpc_action_yside_xid */1734 ch->ccw[9].cmd_code = CCW_CMD_READ;1735 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1736 ch->ccw[9].count = TH_HEADER_LENGTH;1737 ch->ccw[9].cda = virt_to_dma32(ch->rcvd_xid_th);1738 1739 ch->ccw[10].cmd_code = CCW_CMD_READ;1740 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1741 ch->ccw[10].count = XID2_LENGTH;1742 ch->ccw[10].cda = virt_to_dma32(ch->rcvd_xid);1743 1744 if (ch->xid_th == NULL)1745 goto done;1746 ch->ccw[11].cmd_code = CCW_CMD_WRITE;1747 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1748 ch->ccw[11].count = TH_HEADER_LENGTH;1749 ch->ccw[11].cda = virt_to_dma32(ch->xid_th);1750 1751 if (ch->xid == NULL)1752 goto done;1753 ch->ccw[12].cmd_code = CCW_CMD_WRITE;1754 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1755 ch->ccw[12].count = XID2_LENGTH;1756 ch->ccw[12].cda = virt_to_dma32(ch->xid);1757 1758 if (ch->xid_id == NULL)1759 goto done;1760 ch->ccw[13].cmd_code = CCW_CMD_WRITE;1761 ch->ccw[13].cda = virt_to_dma32(ch->xid_id);1762 1763 }1764 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC;1765 ch->ccw[13].count = 4;1766 1767 ch->ccw[14].cmd_code = CCW_CMD_NOOP;1768 ch->ccw[14].flags = CCW_FLAG_SLI;1769 ch->ccw[14].count = 0;1770 ch->ccw[14].cda = 0;1771 1772 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);1773 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);1774 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);1775 CTCM_D3_DUMP((char *)ch->xid_id, 4);1776 1777 if (!in_hardirq()) {1778 /* Such conditional locking is a known problem for1779 * sparse because its static undeterministic.1780 * Warnings should be ignored here. */1781 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);1782 gotlock = 1;1783 }1784 1785 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);1786 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);1787 1788 if (gotlock) /* see remark above about conditional locking */1789 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);1790 1791 if (rc != 0) {1792 ctcm_ccw_check_rc(ch, rc,1793 (side == XSIDE) ? "x-side XID" : "y-side XID");1794 }1795 1796done:1797 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",1798 __func__, ch, ch->id);1799 return;1800 1801}1802 1803/*1804 * MPC Group Station FSM action1805 * CTCM_PROTO_MPC only1806 */1807static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)1808{1809 mpc_action_side_xid(fsm, arg, XSIDE);1810}1811 1812/*1813 * MPC Group Station FSM action1814 * CTCM_PROTO_MPC only1815 */1816static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)1817{1818 mpc_action_side_xid(fsm, arg, YSIDE);1819}1820 1821/*1822 * MPC Group Station FSM action1823 * CTCM_PROTO_MPC only1824 */1825static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)1826{1827 struct channel *ch = arg;1828 struct net_device *dev = ch->netdev;1829 struct ctcm_priv *priv = dev->ml_priv;1830 struct mpc_group *grp = priv->mpcg;1831 1832 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",1833 __func__, smp_processor_id(), ch, ch->id);1834 1835 if (ch->xid == NULL) {1836 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,1837 "%s(%s): ch->xid == NULL",1838 CTCM_FUNTAIL, dev->name);1839 return;1840 }1841 1842 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);1843 1844 ch->xid->xid2_option = XID2_0;1845 1846 switch (fsm_getstate(grp->fsm)) {1847 case MPCG_STATE_XID2INITW:1848 case MPCG_STATE_XID2INITX:1849 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;1850 break;1851 case MPCG_STATE_XID0IOWAIT:1852 case MPCG_STATE_XID0IOWAIX:1853 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;1854 break;1855 }1856 1857 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);1858 1859 return;1860}1861 1862/*1863 * MPC Group Station FSM action1864 * CTCM_PROTO_MPC only1865*/1866static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)1867{1868 struct net_device *dev = arg;1869 struct ctcm_priv *priv = dev->ml_priv;1870 struct mpc_group *grp = NULL;1871 int direction;1872 int send = 0;1873 1874 if (priv)1875 grp = priv->mpcg;1876 if (grp == NULL)1877 return;1878 1879 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {1880 struct channel *ch = priv->channel[direction];1881 struct xid2 *thisxid = ch->xid;1882 ch->xid_skb->data = ch->xid_skb_data;1883 skb_reset_tail_pointer(ch->xid_skb);1884 ch->xid_skb->len = 0;1885 thisxid->xid2_option = XID2_7;1886 send = 0;1887 1888 /* xid7 phase 1 */1889 if (grp->outstanding_xid7_p2 > 0) {1890 if (grp->roll == YSIDE) {1891 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {1892 fsm_newstate(ch->fsm, CH_XID7_PENDING2);1893 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;1894 skb_put_data(ch->xid_skb, &thdummy,1895 TH_HEADER_LENGTH);1896 send = 1;1897 }1898 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {1899 fsm_newstate(ch->fsm, CH_XID7_PENDING2);1900 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;1901 skb_put_data(ch->xid_skb, &thnorm,1902 TH_HEADER_LENGTH);1903 send = 1;1904 }1905 } else {1906 /* xid7 phase 2 */1907 if (grp->roll == YSIDE) {1908 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {1909 fsm_newstate(ch->fsm, CH_XID7_PENDING4);1910 skb_put_data(ch->xid_skb, &thnorm,1911 TH_HEADER_LENGTH);1912 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;1913 send = 1;1914 }1915 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {1916 fsm_newstate(ch->fsm, CH_XID7_PENDING4);1917 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;1918 skb_put_data(ch->xid_skb, &thdummy,1919 TH_HEADER_LENGTH);1920 send = 1;1921 }1922 }1923 1924 if (send)1925 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);1926 }1927 1928 return;1929}1930 1931/*1932 * MPC Group Station FSM action1933 * CTCM_PROTO_MPC only1934 */1935static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)1936{1937 1938 struct mpcg_info *mpcginfo = arg;1939 struct channel *ch = mpcginfo->ch;1940 struct net_device *dev = ch->netdev;1941 struct ctcm_priv *priv = dev->ml_priv;1942 struct mpc_group *grp = priv->mpcg;1943 1944 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",1945 __func__, ch->id, grp->outstanding_xid2,1946 grp->outstanding_xid7, grp->outstanding_xid7_p2);1947 1948 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)1949 fsm_newstate(ch->fsm, CH_XID7_PENDING);1950 1951 grp->outstanding_xid2--;1952 grp->outstanding_xid7++;1953 grp->outstanding_xid7_p2++;1954 1955 /* must change state before validating xid to */1956 /* properly handle interim interrupts received*/1957 switch (fsm_getstate(grp->fsm)) {1958 case MPCG_STATE_XID2INITW:1959 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);1960 mpc_validate_xid(mpcginfo);1961 break;1962 case MPCG_STATE_XID0IOWAIT:1963 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);1964 mpc_validate_xid(mpcginfo);1965 break;1966 case MPCG_STATE_XID2INITX:1967 if (grp->outstanding_xid2 == 0) {1968 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);1969 mpc_validate_xid(mpcginfo);1970 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);1971 }1972 break;1973 case MPCG_STATE_XID0IOWAIX:1974 if (grp->outstanding_xid2 == 0) {1975 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);1976 mpc_validate_xid(mpcginfo);1977 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);1978 }1979 break;1980 }1981 1982 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",1983 __func__, ch->id, grp->outstanding_xid2,1984 grp->outstanding_xid7, grp->outstanding_xid7_p2);1985 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",1986 __func__, ch->id,1987 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));1988 return;1989 1990}1991 1992 1993/*1994 * MPC Group Station FSM action1995 * CTCM_PROTO_MPC only1996 */1997static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)1998{1999 struct mpcg_info *mpcginfo = arg;2000 struct channel *ch = mpcginfo->ch;2001 struct net_device *dev = ch->netdev;2002 struct ctcm_priv *priv = dev->ml_priv;2003 struct mpc_group *grp = priv->mpcg;2004 2005 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",2006 __func__, smp_processor_id(), ch, ch->id);2007 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",2008 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);2009 2010 grp->outstanding_xid7--;2011 ch->xid_skb->data = ch->xid_skb_data;2012 skb_reset_tail_pointer(ch->xid_skb);2013 ch->xid_skb->len = 0;2014 2015 switch (fsm_getstate(grp->fsm)) {2016 case MPCG_STATE_XID7INITI:2017 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);2018 mpc_validate_xid(mpcginfo);2019 break;2020 case MPCG_STATE_XID7INITW:2021 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);2022 mpc_validate_xid(mpcginfo);2023 break;2024 case MPCG_STATE_XID7INITZ:2025 case MPCG_STATE_XID7INITX:2026 if (grp->outstanding_xid7 == 0) {2027 if (grp->outstanding_xid7_p2 > 0) {2028 grp->outstanding_xid7 =2029 grp->outstanding_xid7_p2;2030 grp->outstanding_xid7_p2 = 0;2031 } else2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);2033 2034 mpc_validate_xid(mpcginfo);2035 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);2036 break;2037 }2038 mpc_validate_xid(mpcginfo);2039 break;2040 }2041 return;2042}2043 2044/*2045 * mpc_action helper of an MPC Group Station FSM action2046 * CTCM_PROTO_MPC only2047 */2048static int mpc_send_qllc_discontact(struct net_device *dev)2049{2050 struct sk_buff *skb;2051 struct qllc *qllcptr;2052 struct ctcm_priv *priv = dev->ml_priv;2053 struct mpc_group *grp = priv->mpcg;2054 2055 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",2056 __func__, mpcg_state_names[grp->saved_state]);2057 2058 switch (grp->saved_state) {2059 /*2060 * establish conn callback function is2061 * preferred method to report failure2062 */2063 case MPCG_STATE_XID0IOWAIT:2064 case MPCG_STATE_XID0IOWAIX:2065 case MPCG_STATE_XID7INITI:2066 case MPCG_STATE_XID7INITZ:2067 case MPCG_STATE_XID2INITW:2068 case MPCG_STATE_XID2INITX:2069 case MPCG_STATE_XID7INITW:2070 case MPCG_STATE_XID7INITX:2071 if (grp->estconnfunc) {2072 grp->estconnfunc(grp->port_num, -1, 0);2073 grp->estconnfunc = NULL;2074 break;2075 }2076 fallthrough;2077 case MPCG_STATE_FLOWC:2078 case MPCG_STATE_READY:2079 grp->send_qllc_disc = 2;2080 2081 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);2082 if (skb == NULL) {2083 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,2084 "%s(%s): skb allocation error",2085 CTCM_FUNTAIL, dev->name);2086 priv->stats.rx_dropped++;2087 return -ENOMEM;2088 }2089 2090 qllcptr = skb_put(skb, sizeof(struct qllc));2091 qllcptr->qllc_address = 0xcc;2092 qllcptr->qllc_commands = 0x03;2093 2094 if (skb_headroom(skb) < 4) {2095 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,2096 "%s(%s): skb_headroom error",2097 CTCM_FUNTAIL, dev->name);2098 dev_kfree_skb_any(skb);2099 return -ENOMEM;2100 }2101 2102 *((__u32 *)skb_push(skb, 4)) =2103 priv->channel[CTCM_READ]->pdu_seq;2104 priv->channel[CTCM_READ]->pdu_seq++;2105 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",2106 __func__, priv->channel[CTCM_READ]->pdu_seq);2107 2108 /* receipt of CC03 resets anticipated sequence number on2109 receiving side */2110 priv->channel[CTCM_READ]->pdu_seq = 0x00;2111 skb_reset_mac_header(skb);2112 skb->dev = dev;2113 skb->protocol = htons(ETH_P_SNAP);2114 skb->ip_summed = CHECKSUM_UNNECESSARY;2115 2116 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));2117 2118 netif_rx(skb);2119 break;2120 default:2121 break;2122 2123 }2124 2125 return 0;2126}2127/* --- This is the END my friend --- */2128 2129