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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  Copyright IBM Corp. 2004, 2007
0004  *  Authors:    Belinda Thompson (belindat@us.ibm.com)
0005  *          Andy Richter (richtera@us.ibm.com)
0006  *          Peter Tiedemann (ptiedem@de.ibm.com)
0007  */
0008 
0009 /*
0010     This module exports functions to be used by CCS:
0011     EXPORT_SYMBOL(ctc_mpc_alloc_channel);
0012     EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
0013     EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
0014     EXPORT_SYMBOL(ctc_mpc_flow_control);
0015 */
0016 
0017 #undef DEBUG
0018 #undef DEBUGDATA
0019 #undef DEBUGCCW
0020 
0021 #define KMSG_COMPONENT "ctcm"
0022 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0023 
0024 #include <linux/module.h>
0025 #include <linux/init.h>
0026 #include <linux/kernel.h>
0027 #include <linux/slab.h>
0028 #include <linux/errno.h>
0029 #include <linux/types.h>
0030 #include <linux/interrupt.h>
0031 #include <linux/timer.h>
0032 #include <linux/sched.h>
0033 
0034 #include <linux/signal.h>
0035 #include <linux/string.h>
0036 #include <linux/proc_fs.h>
0037 
0038 #include <linux/ip.h>
0039 #include <linux/if_arp.h>
0040 #include <linux/tcp.h>
0041 #include <linux/skbuff.h>
0042 #include <linux/ctype.h>
0043 #include <linux/netdevice.h>
0044 #include <net/dst.h>
0045 
0046 #include <linux/io.h>       /* instead of <asm/io.h> ok ? */
0047 #include <asm/ccwdev.h>
0048 #include <asm/ccwgroup.h>
0049 #include <linux/bitops.h>   /* instead of <asm/bitops.h> ok ? */
0050 #include <linux/uaccess.h>  /* instead of <asm/uaccess.h> ok ? */
0051 #include <linux/wait.h>
0052 #include <linux/moduleparam.h>
0053 #include <asm/idals.h>
0054 
0055 #include "ctcm_main.h"
0056 #include "ctcm_mpc.h"
0057 #include "ctcm_fsms.h"
0058 
0059 static const struct xid2 init_xid = {
0060     .xid2_type_id   =   XID_FM2,
0061     .xid2_len   =   0x45,
0062     .xid2_adj_id    =   0,
0063     .xid2_rlen  =   0x31,
0064     .xid2_resv1 =   0,
0065     .xid2_flag1 =   0,
0066     .xid2_fmtt  =   0,
0067     .xid2_flag4 =   0x80,
0068     .xid2_resv2 =   0,
0069     .xid2_tgnum =   0,
0070     .xid2_sender_id =   0,
0071     .xid2_flag2 =   0,
0072     .xid2_option    =   XID2_0,
0073     .xid2_resv3 =   "\x00",
0074     .xid2_resv4 =   0,
0075     .xid2_dlc_type  =   XID2_READ_SIDE,
0076     .xid2_resv5 =   0,
0077     .xid2_mpc_flag  =   0,
0078     .xid2_resv6 =   0,
0079     .xid2_buf_len   =   (MPC_BUFSIZE_DEFAULT - 35),
0080 };
0081 
0082 static const struct th_header thnorm = {
0083     .th_seg     =   0x00,
0084     .th_ch_flag =   TH_IS_XID,
0085     .th_blk_flag    =   TH_DATA_IS_XID,
0086     .th_is_xid  =   0x01,
0087     .th_seq_num =   0x00000000,
0088 };
0089 
0090 static const struct th_header thdummy = {
0091     .th_seg     =   0x00,
0092     .th_ch_flag =   0x00,
0093     .th_blk_flag    =   TH_DATA_IS_XID,
0094     .th_is_xid  =   0x01,
0095     .th_seq_num =   0x00000000,
0096 };
0097 
0098 /*
0099  * Definition of one MPC group
0100  */
0101 
0102 /*
0103  * Compatibility macros for busy handling
0104  * of network devices.
0105  */
0106 
0107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
0108 
0109 /*
0110  * MPC Group state machine actions (static prototypes)
0111  */
0112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
0113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
0114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
0115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
0116 static int  mpc_validate_xid(struct mpcg_info *mpcginfo);
0117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
0118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
0119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
0120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
0121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
0122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
0123 
0124 #ifdef DEBUGDATA
0125 /*-------------------------------------------------------------------*
0126 * Dump buffer format                             *
0127 *                                    *
0128 *--------------------------------------------------------------------*/
0129 void ctcmpc_dumpit(char *buf, int len)
0130 {
0131     __u32   ct, sw, rm, dup;
0132     char    *ptr, *rptr;
0133     char    tbuf[82], tdup[82];
0134     char    addr[22];
0135     char    boff[12];
0136     char    bhex[82], duphex[82];
0137     char    basc[40];
0138 
0139     sw  = 0;
0140     rptr = ptr = buf;
0141     rm  = 16;
0142     duphex[0] = 0x00;
0143     dup = 0;
0144 
0145     for (ct = 0; ct < len; ct++, ptr++, rptr++) {
0146         if (sw == 0) {
0147             sprintf(addr, "%16.16llx", (__u64)rptr);
0148 
0149             sprintf(boff, "%4.4X", (__u32)ct);
0150             bhex[0] = '\0';
0151             basc[0] = '\0';
0152         }
0153         if ((sw == 4) || (sw == 12))
0154             strcat(bhex, " ");
0155         if (sw == 8)
0156             strcat(bhex, "  ");
0157 
0158         sprintf(tbuf, "%2.2llX", (__u64)*ptr);
0159 
0160         tbuf[2] = '\0';
0161         strcat(bhex, tbuf);
0162         if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
0163             basc[sw] = *ptr;
0164         else
0165             basc[sw] = '.';
0166 
0167         basc[sw+1] = '\0';
0168         sw++;
0169         rm--;
0170         if (sw != 16)
0171             continue;
0172         if ((strcmp(duphex, bhex)) != 0) {
0173             if (dup != 0) {
0174                 sprintf(tdup,
0175                     "Duplicate as above to %s", addr);
0176                 ctcm_pr_debug("            --- %s ---\n",
0177                         tdup);
0178             }
0179             ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
0180                     addr, boff, bhex, basc);
0181             dup = 0;
0182             strcpy(duphex, bhex);
0183         } else
0184             dup++;
0185 
0186         sw = 0;
0187         rm = 16;
0188     }  /* endfor */
0189 
0190     if (sw != 0) {
0191         for ( ; rm > 0; rm--, sw++) {
0192             if ((sw == 4) || (sw == 12))
0193                 strcat(bhex, " ");
0194             if (sw == 8)
0195                 strcat(bhex, "  ");
0196             strcat(bhex, "  ");
0197             strcat(basc, " ");
0198         }
0199         if (dup != 0) {
0200             sprintf(tdup, "Duplicate as above to %s", addr);
0201             ctcm_pr_debug("            --- %s ---\n", tdup);
0202         }
0203         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
0204                     addr, boff, bhex, basc);
0205     } else {
0206         if (dup >= 1) {
0207             sprintf(tdup, "Duplicate as above to %s", addr);
0208             ctcm_pr_debug("            --- %s ---\n", tdup);
0209         }
0210         if (dup != 0) {
0211             ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
0212                 addr, boff, bhex, basc);
0213         }
0214     }
0215 
0216     return;
0217 
0218 }   /*   end of ctcmpc_dumpit  */
0219 #endif
0220 
0221 #ifdef DEBUGDATA
0222 /*
0223  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
0224  *
0225  * skb      The sk_buff to dump.
0226  * offset   Offset relative to skb-data, where to start the dump.
0227  */
0228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
0229 {
0230     __u8 *p = skb->data;
0231     struct th_header *header;
0232     struct pdu *pheader;
0233     int bl = skb->len;
0234     int i;
0235 
0236     if (p == NULL)
0237         return;
0238 
0239     p += offset;
0240     header = (struct th_header *)p;
0241 
0242     ctcm_pr_debug("dump:\n");
0243     ctcm_pr_debug("skb len=%d \n", skb->len);
0244     if (skb->len > 2) {
0245         switch (header->th_ch_flag) {
0246         case TH_HAS_PDU:
0247             break;
0248         case 0x00:
0249         case TH_IS_XID:
0250             if ((header->th_blk_flag == TH_DATA_IS_XID) &&
0251                (header->th_is_xid == 0x01))
0252                 goto dumpth;
0253         case TH_SWEEP_REQ:
0254                 goto dumpth;
0255         case TH_SWEEP_RESP:
0256                 goto dumpth;
0257         default:
0258             break;
0259         }
0260 
0261         pheader = (struct pdu *)p;
0262         ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
0263                    pheader->pdu_offset, pheader->pdu_offset);
0264         ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
0265         ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
0266         ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
0267                     goto dumpdata;
0268 
0269 dumpth:
0270         ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
0271         ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
0272         ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
0273         ctcm_pr_debug("th->type    : %s\n",
0274                    (header->th_is_xid) ? "DATA" : "XID");
0275         ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
0276 
0277     }
0278 dumpdata:
0279     if (bl > 32)
0280         bl = 32;
0281     ctcm_pr_debug("data: ");
0282     for (i = 0; i < bl; i++)
0283         ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
0284     ctcm_pr_debug("\n");
0285 }
0286 #endif
0287 
0288 static struct net_device *ctcmpc_get_dev(int port_num)
0289 {
0290     char device[20];
0291     struct net_device *dev;
0292     struct ctcm_priv *priv;
0293 
0294     sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
0295 
0296     dev = __dev_get_by_name(&init_net, device);
0297 
0298     if (dev == NULL) {
0299         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0300             "%s: Device not found by name: %s",
0301                     CTCM_FUNTAIL, device);
0302         return NULL;
0303     }
0304     priv = dev->ml_priv;
0305     if (priv == NULL) {
0306         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0307             "%s(%s): dev->ml_priv is NULL",
0308                     CTCM_FUNTAIL, device);
0309         return NULL;
0310     }
0311     if (priv->mpcg == NULL) {
0312         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0313             "%s(%s): priv->mpcg is NULL",
0314                     CTCM_FUNTAIL, device);
0315         return NULL;
0316     }
0317     return dev;
0318 }
0319 
0320 /*
0321  * ctc_mpc_alloc_channel
0322  *  (exported interface)
0323  *
0324  * Device Initialization :
0325  *  ACTPATH  driven IO operations
0326  */
0327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
0328 {
0329     struct net_device *dev;
0330     struct mpc_group *grp;
0331     struct ctcm_priv *priv;
0332 
0333     dev = ctcmpc_get_dev(port_num);
0334     if (dev == NULL)
0335         return 1;
0336     priv = dev->ml_priv;
0337     grp = priv->mpcg;
0338 
0339     grp->allochanfunc = callback;
0340     grp->port_num = port_num;
0341     grp->port_persist = 1;
0342 
0343     CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
0344             "%s(%s): state=%s",
0345             CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
0346 
0347     switch (fsm_getstate(grp->fsm)) {
0348     case MPCG_STATE_INOP:
0349         /* Group is in the process of terminating */
0350         grp->alloc_called = 1;
0351         break;
0352     case MPCG_STATE_RESET:
0353         /* MPC Group will transition to state         */
0354         /* MPCG_STATE_XID2INITW iff the minimum number    */
0355         /* of 1 read and 1 write channel have successfully*/
0356         /* activated                      */
0357         /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
0358         if (callback)
0359             grp->send_qllc_disc = 1;
0360         fallthrough;
0361     case MPCG_STATE_XID0IOWAIT:
0362         fsm_deltimer(&grp->timer);
0363         grp->outstanding_xid2 = 0;
0364         grp->outstanding_xid7 = 0;
0365         grp->outstanding_xid7_p2 = 0;
0366         grp->saved_xid2 = NULL;
0367         if (callback)
0368             ctcm_open(dev);
0369         fsm_event(priv->fsm, DEV_EVENT_START, dev);
0370         break;
0371     case MPCG_STATE_READY:
0372         /* XID exchanges completed after PORT was activated */
0373         /* Link station already active              */
0374         /* Maybe timing issue...retry callback          */
0375         grp->allocchan_callback_retries++;
0376         if (grp->allocchan_callback_retries < 4) {
0377             if (grp->allochanfunc)
0378                 grp->allochanfunc(grp->port_num,
0379                           grp->group_max_buflen);
0380         } else {
0381             /* there are problems...bail out        */
0382             /* there may be a state mismatch so restart */
0383             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0384             grp->allocchan_callback_retries = 0;
0385         }
0386         break;
0387     }
0388 
0389     return 0;
0390 }
0391 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
0392 
0393 /*
0394  * ctc_mpc_establish_connectivity
0395  *  (exported interface)
0396  */
0397 void ctc_mpc_establish_connectivity(int port_num,
0398                 void (*callback)(int, int, int))
0399 {
0400     struct net_device *dev;
0401     struct mpc_group *grp;
0402     struct ctcm_priv *priv;
0403     struct channel *rch, *wch;
0404 
0405     dev = ctcmpc_get_dev(port_num);
0406     if (dev == NULL)
0407         return;
0408     priv = dev->ml_priv;
0409     grp = priv->mpcg;
0410     rch = priv->channel[CTCM_READ];
0411     wch = priv->channel[CTCM_WRITE];
0412 
0413     CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
0414             "%s(%s): state=%s",
0415             CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
0416 
0417     grp->estconnfunc = callback;
0418     grp->port_num = port_num;
0419 
0420     switch (fsm_getstate(grp->fsm)) {
0421     case MPCG_STATE_READY:
0422         /* XID exchanges completed after PORT was activated */
0423         /* Link station already active              */
0424         /* Maybe timing issue...retry callback          */
0425         fsm_deltimer(&grp->timer);
0426         grp->estconn_callback_retries++;
0427         if (grp->estconn_callback_retries < 4) {
0428             if (grp->estconnfunc) {
0429                 grp->estconnfunc(grp->port_num, 0,
0430                         grp->group_max_buflen);
0431                 grp->estconnfunc = NULL;
0432             }
0433         } else {
0434             /* there are problems...bail out     */
0435             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0436             grp->estconn_callback_retries = 0;
0437         }
0438         break;
0439     case MPCG_STATE_INOP:
0440     case MPCG_STATE_RESET:
0441         /* MPC Group is not ready to start XID - min num of */
0442         /* 1 read and 1 write channel have not been acquired*/
0443 
0444         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0445             "%s(%s): REJECTED - inactive channels",
0446                     CTCM_FUNTAIL, dev->name);
0447         if (grp->estconnfunc) {
0448             grp->estconnfunc(grp->port_num, -1, 0);
0449             grp->estconnfunc = NULL;
0450         }
0451         break;
0452     case MPCG_STATE_XID2INITW:
0453         /* alloc channel was called but no XID exchange    */
0454         /* has occurred. initiate xside XID exchange       */
0455         /* make sure yside XID0 processing has not started */
0456 
0457         if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
0458             (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
0459             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0460                 "%s(%s): ABORT - PASSIVE XID",
0461                     CTCM_FUNTAIL, dev->name);
0462             break;
0463         }
0464         grp->send_qllc_disc = 1;
0465         fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
0466         fsm_deltimer(&grp->timer);
0467         fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
0468                         MPCG_EVENT_TIMER, dev);
0469         grp->outstanding_xid7 = 0;
0470         grp->outstanding_xid7_p2 = 0;
0471         grp->saved_xid2 = NULL;
0472         if ((rch->in_mpcgroup) &&
0473                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
0474             fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
0475         else {
0476             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0477                 "%s(%s): RX-%s not ready for ACTIVE XID0",
0478                     CTCM_FUNTAIL, dev->name, rch->id);
0479             if (grp->estconnfunc) {
0480                 grp->estconnfunc(grp->port_num, -1, 0);
0481                 grp->estconnfunc = NULL;
0482             }
0483             fsm_deltimer(&grp->timer);
0484                 goto done;
0485         }
0486         if ((wch->in_mpcgroup) &&
0487                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
0488             fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
0489         else {
0490             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0491                 "%s(%s): WX-%s not ready for ACTIVE XID0",
0492                     CTCM_FUNTAIL, dev->name, wch->id);
0493             if (grp->estconnfunc) {
0494                 grp->estconnfunc(grp->port_num, -1, 0);
0495                 grp->estconnfunc = NULL;
0496             }
0497             fsm_deltimer(&grp->timer);
0498                 goto done;
0499             }
0500         break;
0501     case MPCG_STATE_XID0IOWAIT:
0502         /* already in active XID negotiations */
0503     default:
0504         break;
0505     }
0506 
0507 done:
0508     CTCM_PR_DEBUG("Exit %s()\n", __func__);
0509     return;
0510 }
0511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
0512 
0513 /*
0514  * ctc_mpc_dealloc_ch
0515  *  (exported interface)
0516  */
0517 void ctc_mpc_dealloc_ch(int port_num)
0518 {
0519     struct net_device *dev;
0520     struct ctcm_priv *priv;
0521     struct mpc_group *grp;
0522 
0523     dev = ctcmpc_get_dev(port_num);
0524     if (dev == NULL)
0525         return;
0526     priv = dev->ml_priv;
0527     grp = priv->mpcg;
0528 
0529     CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
0530             "%s: %s: refcount = %d\n",
0531             CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
0532 
0533     fsm_deltimer(&priv->restart_timer);
0534     grp->channels_terminating = 0;
0535     fsm_deltimer(&grp->timer);
0536     grp->allochanfunc = NULL;
0537     grp->estconnfunc = NULL;
0538     grp->port_persist = 0;
0539     grp->send_qllc_disc = 0;
0540     fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0541 
0542     ctcm_close(dev);
0543     return;
0544 }
0545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
0546 
0547 /*
0548  * ctc_mpc_flow_control
0549  *  (exported interface)
0550  */
0551 void ctc_mpc_flow_control(int port_num, int flowc)
0552 {
0553     struct ctcm_priv *priv;
0554     struct mpc_group *grp;
0555     struct net_device *dev;
0556     struct channel *rch;
0557     int mpcg_state;
0558 
0559     dev = ctcmpc_get_dev(port_num);
0560     if (dev == NULL)
0561         return;
0562     priv = dev->ml_priv;
0563     grp = priv->mpcg;
0564 
0565     CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
0566             "%s: %s: flowc = %d",
0567                 CTCM_FUNTAIL, dev->name, flowc);
0568 
0569     rch = priv->channel[CTCM_READ];
0570 
0571     mpcg_state = fsm_getstate(grp->fsm);
0572     switch (flowc) {
0573     case 1:
0574         if (mpcg_state == MPCG_STATE_FLOWC)
0575             break;
0576         if (mpcg_state == MPCG_STATE_READY) {
0577             if (grp->flow_off_called == 1)
0578                 grp->flow_off_called = 0;
0579             else
0580                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
0581             break;
0582         }
0583         break;
0584     case 0:
0585         if (mpcg_state == MPCG_STATE_FLOWC) {
0586             fsm_newstate(grp->fsm, MPCG_STATE_READY);
0587             /* ensure any data that has accumulated */
0588             /* on the io_queue will now be sen t    */
0589             tasklet_schedule(&rch->ch_tasklet);
0590         }
0591         /* possible race condition          */
0592         if (mpcg_state == MPCG_STATE_READY) {
0593             grp->flow_off_called = 1;
0594             break;
0595         }
0596         break;
0597     }
0598 
0599 }
0600 EXPORT_SYMBOL(ctc_mpc_flow_control);
0601 
0602 static int mpc_send_qllc_discontact(struct net_device *);
0603 
0604 /*
0605  * helper function of ctcmpc_unpack_skb
0606 */
0607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
0608 {
0609     struct channel    *rch = mpcginfo->ch;
0610     struct net_device *dev = rch->netdev;
0611     struct ctcm_priv   *priv = dev->ml_priv;
0612     struct mpc_group  *grp = priv->mpcg;
0613     struct channel    *ch = priv->channel[CTCM_WRITE];
0614 
0615     CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
0616     CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
0617 
0618     grp->sweep_rsp_pend_num--;
0619 
0620     if ((grp->sweep_req_pend_num == 0) &&
0621             (grp->sweep_rsp_pend_num == 0)) {
0622         fsm_deltimer(&ch->sweep_timer);
0623         grp->in_sweep = 0;
0624         rch->th_seq_num = 0x00;
0625         ch->th_seq_num = 0x00;
0626         ctcm_clear_busy_do(dev);
0627     }
0628 
0629     return;
0630 
0631 }
0632 
0633 /*
0634  * helper function of mpc_rcvd_sweep_req
0635  * which is a helper of ctcmpc_unpack_skb
0636  */
0637 static void ctcmpc_send_sweep_resp(struct channel *rch)
0638 {
0639     struct net_device *dev = rch->netdev;
0640     struct ctcm_priv *priv = dev->ml_priv;
0641     struct mpc_group *grp = priv->mpcg;
0642     struct th_sweep *header;
0643     struct sk_buff *sweep_skb;
0644     struct channel *ch  = priv->channel[CTCM_WRITE];
0645 
0646     CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
0647 
0648     sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
0649     if (sweep_skb == NULL) {
0650         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0651             "%s(%s): sweep_skb allocation ERROR\n",
0652             CTCM_FUNTAIL, rch->id);
0653         goto done;
0654     }
0655 
0656     header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
0657     header->th.th_ch_flag   = TH_SWEEP_RESP;
0658     header->sw.th_last_seq  = ch->th_seq_num;
0659 
0660     netif_trans_update(dev);
0661     skb_queue_tail(&ch->sweep_queue, sweep_skb);
0662 
0663     fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
0664 
0665     return;
0666 
0667 done:
0668     grp->in_sweep = 0;
0669     ctcm_clear_busy_do(dev);
0670     fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0671 
0672     return;
0673 }
0674 
0675 /*
0676  * helper function of ctcmpc_unpack_skb
0677  */
0678 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
0679 {
0680     struct channel    *rch     = mpcginfo->ch;
0681     struct net_device *dev     = rch->netdev;
0682     struct ctcm_priv  *priv = dev->ml_priv;
0683     struct mpc_group  *grp  = priv->mpcg;
0684     struct channel    *ch      = priv->channel[CTCM_WRITE];
0685 
0686     if (do_debug)
0687         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
0688             " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
0689 
0690     if (grp->in_sweep == 0) {
0691         grp->in_sweep = 1;
0692         ctcm_test_and_set_busy(dev);
0693         grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
0694         grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
0695     }
0696 
0697     CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
0698 
0699     grp->sweep_req_pend_num--;
0700     ctcmpc_send_sweep_resp(ch);
0701     kfree(mpcginfo);
0702     return;
0703 }
0704 
0705 /*
0706   * MPC Group Station FSM definitions
0707  */
0708 static const char *mpcg_event_names[] = {
0709     [MPCG_EVENT_INOP]   = "INOP Condition",
0710     [MPCG_EVENT_DISCONC]    = "Discontact Received",
0711     [MPCG_EVENT_XID0DO] = "Channel Active - Start XID",
0712     [MPCG_EVENT_XID2]   = "XID2 Received",
0713     [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
0714     [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
0715     [MPCG_EVENT_TIMER]  = "XID Setup Timer",
0716     [MPCG_EVENT_DOIO]   = "XID DoIO",
0717 };
0718 
0719 static const char *mpcg_state_names[] = {
0720     [MPCG_STATE_RESET]  = "Reset",
0721     [MPCG_STATE_INOP]   = "INOP",
0722     [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
0723     [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
0724     [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
0725     [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
0726     [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
0727     [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
0728     [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
0729     [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
0730     [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
0731     [MPCG_STATE_FLOWC]  = "FLOW CONTROL ON",
0732     [MPCG_STATE_READY]  = "READY",
0733 };
0734 
0735 /*
0736  * The MPC Group Station FSM
0737  *   22 events
0738  */
0739 static const fsm_node mpcg_fsm[] = {
0740     { MPCG_STATE_RESET, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0741     { MPCG_STATE_INOP,  MPCG_EVENT_INOP,    mpc_action_nop        },
0742     { MPCG_STATE_FLOWC, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0743 
0744     { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact },
0745     { MPCG_STATE_READY, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0746 
0747     { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,  mpc_action_doxid0     },
0748     { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,    mpc_action_rcvd_xid0  },
0749     { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0750     { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0751     { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,    mpc_action_yside_xid  },
0752 
0753     { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,  mpc_action_doxid0     },
0754     { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,    mpc_action_rcvd_xid0  },
0755     { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0756     { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0757     { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,    mpc_action_yside_xid  },
0758 
0759     { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
0760     { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact },
0761     { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,    mpc_action_rcvd_xid7  },
0762     { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0763     { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0764     { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
0765     { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,    mpc_action_yside_xid  },
0766 
0767     { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact },
0768     { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,    mpc_action_rcvd_xid7  },
0769     { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0770     { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
0771     { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0772     { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,    mpc_action_yside_xid  },
0773 
0774     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0     },
0775     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
0776     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,   mpc_action_rcvd_xid0  },
0777     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,   mpc_action_go_inop    },
0778     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,  mpc_action_timeout    },
0779     { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,   mpc_action_xside_xid  },
0780 
0781     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0     },
0782     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
0783     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,   mpc_action_rcvd_xid0  },
0784     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,   mpc_action_go_inop    },
0785     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,  mpc_action_timeout    },
0786     { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,   mpc_action_xside_xid  },
0787 
0788     { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
0789     { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,    mpc_action_rcvd_xid7  },
0790     { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact },
0791     { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0792     { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0793     { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
0794     { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,    mpc_action_xside_xid  },
0795 
0796     { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,    mpc_action_rcvd_xid7  },
0797     { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
0798     { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact },
0799     { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0800     { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,   mpc_action_timeout    },
0801     { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,    mpc_action_xside_xid  },
0802 
0803     { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,    mpc_action_go_inop    },
0804     { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
0805 };
0806 
0807 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
0808 
0809 /*
0810  * MPC Group Station FSM action
0811  * CTCM_PROTO_MPC only
0812  */
0813 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
0814 {
0815     struct net_device *dev = arg;
0816     struct ctcm_priv *priv = dev->ml_priv;
0817     struct mpc_group *grp = priv->mpcg;
0818 
0819     if (grp == NULL) {
0820         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0821             "%s(%s): No MPC group",
0822                 CTCM_FUNTAIL, dev->name);
0823         return;
0824     }
0825 
0826     fsm_deltimer(&grp->timer);
0827 
0828     if (grp->saved_xid2->xid2_flag2 == 0x40) {
0829         priv->xid->xid2_flag2 = 0x00;
0830         if (grp->estconnfunc) {
0831             grp->estconnfunc(grp->port_num, 1,
0832                     grp->group_max_buflen);
0833             grp->estconnfunc = NULL;
0834         } else if (grp->allochanfunc)
0835             grp->send_qllc_disc = 1;
0836 
0837         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0838         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0839                 "%s(%s): fails",
0840                     CTCM_FUNTAIL, dev->name);
0841         return;
0842     }
0843 
0844     grp->port_persist = 1;
0845     grp->out_of_sequence = 0;
0846     grp->estconn_called = 0;
0847 
0848     tasklet_hi_schedule(&grp->mpc_tasklet2);
0849 
0850     return;
0851 }
0852 
0853 /*
0854  * helper of ctcm_init_netdevice
0855  * CTCM_PROTO_MPC only
0856  */
0857 void mpc_group_ready(unsigned long adev)
0858 {
0859     struct net_device *dev = (struct net_device *)adev;
0860     struct ctcm_priv *priv = dev->ml_priv;
0861     struct mpc_group *grp = priv->mpcg;
0862     struct channel *ch = NULL;
0863 
0864     if (grp == NULL) {
0865         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0866             "%s(%s): No MPC group",
0867                 CTCM_FUNTAIL, dev->name);
0868         return;
0869     }
0870 
0871     CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
0872         "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
0873             CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
0874 
0875     fsm_newstate(grp->fsm, MPCG_STATE_READY);
0876 
0877     /* Put up a read on the channel */
0878     ch = priv->channel[CTCM_READ];
0879     ch->pdu_seq = 0;
0880     CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
0881             __func__, ch->pdu_seq);
0882 
0883     ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
0884     /* Put the write channel in idle state */
0885     ch = priv->channel[CTCM_WRITE];
0886     if (ch->collect_len > 0) {
0887         spin_lock(&ch->collect_lock);
0888         ctcm_purge_skb_queue(&ch->collect_queue);
0889         ch->collect_len = 0;
0890         spin_unlock(&ch->collect_lock);
0891     }
0892     ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
0893     ctcm_clear_busy(dev);
0894 
0895     if (grp->estconnfunc) {
0896         grp->estconnfunc(grp->port_num, 0,
0897                     grp->group_max_buflen);
0898         grp->estconnfunc = NULL;
0899     } else  if (grp->allochanfunc)
0900         grp->allochanfunc(grp->port_num, grp->group_max_buflen);
0901 
0902     grp->send_qllc_disc = 1;
0903     grp->changed_side = 0;
0904 
0905     return;
0906 
0907 }
0908 
0909 /*
0910  * Increment the MPC Group Active Channel Counts
0911  * helper of dev_action (called from channel fsm)
0912  */
0913 void mpc_channel_action(struct channel *ch, int direction, int action)
0914 {
0915     struct net_device  *dev  = ch->netdev;
0916     struct ctcm_priv   *priv = dev->ml_priv;
0917     struct mpc_group   *grp  = priv->mpcg;
0918 
0919     if (grp == NULL) {
0920         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0921             "%s(%s): No MPC group",
0922                 CTCM_FUNTAIL, dev->name);
0923         return;
0924     }
0925 
0926     CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
0927 
0928     CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
0929         "%s: %i / Grp:%s total_channels=%i, active_channels: "
0930         "read=%i, write=%i\n", __func__, action,
0931         fsm_getstate_str(grp->fsm), grp->num_channel_paths,
0932         grp->active_channels[CTCM_READ],
0933         grp->active_channels[CTCM_WRITE]);
0934 
0935     if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
0936         grp->num_channel_paths++;
0937         grp->active_channels[direction]++;
0938         grp->outstanding_xid2++;
0939         ch->in_mpcgroup = 1;
0940 
0941         if (ch->xid_skb != NULL)
0942             dev_kfree_skb_any(ch->xid_skb);
0943 
0944         ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
0945                     GFP_ATOMIC | GFP_DMA);
0946         if (ch->xid_skb == NULL) {
0947             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0948                 "%s(%s): Couldn't alloc ch xid_skb\n",
0949                 CTCM_FUNTAIL, dev->name);
0950             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0951             return;
0952         }
0953         ch->xid_skb_data = ch->xid_skb->data;
0954         ch->xid_th = (struct th_header *)ch->xid_skb->data;
0955         skb_put(ch->xid_skb, TH_HEADER_LENGTH);
0956         ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
0957         skb_put(ch->xid_skb, XID2_LENGTH);
0958         ch->xid_id = skb_tail_pointer(ch->xid_skb);
0959         ch->xid_skb->data = ch->xid_skb_data;
0960         skb_reset_tail_pointer(ch->xid_skb);
0961         ch->xid_skb->len = 0;
0962 
0963         skb_put_data(ch->xid_skb, grp->xid_skb->data,
0964                  grp->xid_skb->len);
0965 
0966         ch->xid->xid2_dlc_type =
0967             ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
0968                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
0969 
0970         if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
0971             ch->xid->xid2_buf_len = 0x00;
0972 
0973         ch->xid_skb->data = ch->xid_skb_data;
0974         skb_reset_tail_pointer(ch->xid_skb);
0975         ch->xid_skb->len = 0;
0976 
0977         fsm_newstate(ch->fsm, CH_XID0_PENDING);
0978 
0979         if ((grp->active_channels[CTCM_READ] > 0) &&
0980             (grp->active_channels[CTCM_WRITE] > 0) &&
0981             (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
0982             fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
0983             CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
0984                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
0985                         __func__, dev->name);
0986         }
0987     } else if ((action == MPC_CHANNEL_REMOVE) &&
0988             (ch->in_mpcgroup == 1)) {
0989         ch->in_mpcgroup = 0;
0990         grp->num_channel_paths--;
0991         grp->active_channels[direction]--;
0992 
0993         if (ch->xid_skb != NULL)
0994             dev_kfree_skb_any(ch->xid_skb);
0995         ch->xid_skb = NULL;
0996 
0997         if (grp->channels_terminating)
0998                     goto done;
0999 
1000         if (((grp->active_channels[CTCM_READ] == 0) &&
1001                     (grp->active_channels[CTCM_WRITE] > 0))
1002             || ((grp->active_channels[CTCM_WRITE] == 0) &&
1003                     (grp->active_channels[CTCM_READ] > 0)))
1004             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1005     }
1006 done:
1007     CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1008         "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1009         "read=%i, write=%i\n", __func__, action,
1010         fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1011         grp->active_channels[CTCM_READ],
1012         grp->active_channels[CTCM_WRITE]);
1013 
1014     CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1015 }
1016 
1017 /*
1018  * Unpack a just received skb and hand it over to
1019  * upper layers.
1020  * special MPC version of unpack_skb.
1021  *
1022  * ch       The channel where this skb has been received.
1023  * pskb     The received skb.
1024  */
1025 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1026 {
1027     struct net_device *dev  = ch->netdev;
1028     struct ctcm_priv *priv = dev->ml_priv;
1029     struct mpc_group *grp = priv->mpcg;
1030     struct pdu *curr_pdu;
1031     struct mpcg_info *mpcginfo;
1032     struct th_header *header = NULL;
1033     struct th_sweep *sweep = NULL;
1034     int pdu_last_seen = 0;
1035     __u32 new_len;
1036     struct sk_buff *skb;
1037     int skblen;
1038     int sendrc = 0;
1039 
1040     CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1041             __func__, dev->name, smp_processor_id(), ch->id);
1042 
1043     header = (struct th_header *)pskb->data;
1044     if ((header->th_seg == 0) &&
1045         (header->th_ch_flag == 0) &&
1046         (header->th_blk_flag == 0) &&
1047         (header->th_seq_num == 0))
1048         /* nothing for us */    goto done;
1049 
1050     CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1051     CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1052     CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1053 
1054     pskb->dev = dev;
1055     pskb->ip_summed = CHECKSUM_UNNECESSARY;
1056     skb_pull(pskb, TH_HEADER_LENGTH);
1057 
1058     if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1059         CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1060         if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1061            ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1062             (header->th_seq_num != ch->th_seq_num + 1) &&
1063             (ch->th_seq_num != 0))) {
1064             /* This is NOT the next segment     *
1065              * we are not the correct race winner   *
1066              * go away and let someone else win *
1067              * BUT..this only applies if xid negot  *
1068              * is done              *
1069             */
1070             grp->out_of_sequence += 1;
1071             __skb_push(pskb, TH_HEADER_LENGTH);
1072             skb_queue_tail(&ch->io_queue, pskb);
1073             CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1074                     "got:%08x\n", __func__,
1075                 ch->th_seq_num + 1, header->th_seq_num);
1076 
1077             return;
1078         }
1079         grp->out_of_sequence = 0;
1080         ch->th_seq_num = header->th_seq_num;
1081 
1082         CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1083                     __func__, ch->th_seq_num);
1084 
1085         if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1086                     goto done;
1087         while ((pskb->len > 0) && !pdu_last_seen) {
1088             curr_pdu = (struct pdu *)pskb->data;
1089 
1090             CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1091             CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1092             CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1093                         __func__, pskb->len);
1094 
1095             skb_pull(pskb, PDU_HEADER_LENGTH);
1096 
1097             if (curr_pdu->pdu_flag & PDU_LAST)
1098                 pdu_last_seen = 1;
1099             if (curr_pdu->pdu_flag & PDU_CNTL)
1100                 pskb->protocol = htons(ETH_P_SNAP);
1101             else
1102                 pskb->protocol = htons(ETH_P_SNA_DIX);
1103 
1104             if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1105                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1106                     "%s(%s): Dropping packet with "
1107                     "illegal siize %d",
1108                     CTCM_FUNTAIL, dev->name, pskb->len);
1109 
1110                 priv->stats.rx_dropped++;
1111                 priv->stats.rx_length_errors++;
1112                     goto done;
1113             }
1114             skb_reset_mac_header(pskb);
1115             new_len = curr_pdu->pdu_offset;
1116             CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1117                         __func__, new_len);
1118             if ((new_len == 0) || (new_len > pskb->len)) {
1119                 /* should never happen          */
1120                 /* pskb len must be hosed...bail out */
1121                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1122                     "%s(%s): non valid pdu_offset: %04x",
1123                     /* "data may be lost", */
1124                     CTCM_FUNTAIL, dev->name, new_len);
1125                 goto done;
1126             }
1127             skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1128 
1129             if (!skb) {
1130                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1131                     "%s(%s): MEMORY allocation error",
1132                         CTCM_FUNTAIL, dev->name);
1133                 priv->stats.rx_dropped++;
1134                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1135                         goto done;
1136             }
1137             skb_put_data(skb, pskb->data, new_len);
1138 
1139             skb_reset_mac_header(skb);
1140             skb->dev = pskb->dev;
1141             skb->protocol = pskb->protocol;
1142             skb->ip_summed = CHECKSUM_UNNECESSARY;
1143             *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1144             ch->pdu_seq++;
1145 
1146             if (do_debug_data) {
1147                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1148                         __func__, ch->pdu_seq);
1149                 ctcm_pr_debug("%s: skb:%0lx "
1150                     "skb len: %d \n", __func__,
1151                     (unsigned long)skb, skb->len);
1152                 ctcm_pr_debug("%s: up to 32 bytes "
1153                     "of pdu_data sent\n", __func__);
1154                 ctcmpc_dump32((char *)skb->data, skb->len);
1155             }
1156 
1157             skblen = skb->len;
1158             sendrc = netif_rx(skb);
1159             priv->stats.rx_packets++;
1160             priv->stats.rx_bytes += skblen;
1161             skb_pull(pskb, new_len); /* point to next PDU */
1162         }
1163     } else {
1164         mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1165         if (mpcginfo == NULL)
1166                     goto done;
1167 
1168         mpcginfo->ch = ch;
1169         mpcginfo->th = header;
1170         mpcginfo->skb = pskb;
1171         CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1172                     __func__);
1173         /*  it's a sweep?   */
1174         sweep = (struct th_sweep *)pskb->data;
1175         mpcginfo->sweep = sweep;
1176         if (header->th_ch_flag == TH_SWEEP_REQ)
1177             mpc_rcvd_sweep_req(mpcginfo);
1178         else if (header->th_ch_flag == TH_SWEEP_RESP)
1179             mpc_rcvd_sweep_resp(mpcginfo);
1180         else if (header->th_blk_flag == TH_DATA_IS_XID) {
1181             struct xid2 *thisxid = (struct xid2 *)pskb->data;
1182             skb_pull(pskb, XID2_LENGTH);
1183             mpcginfo->xid = thisxid;
1184             fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1185         } else if (header->th_blk_flag == TH_DISCONTACT)
1186             fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1187         else if (header->th_seq_num != 0) {
1188             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1189                 "%s(%s): control pkt expected\n",
1190                         CTCM_FUNTAIL, dev->name);
1191             priv->stats.rx_dropped++;
1192             /* mpcginfo only used for non-data transfers */
1193             if (do_debug_data)
1194                 ctcmpc_dump_skb(pskb, -8);
1195         }
1196         kfree(mpcginfo);
1197     }
1198 done:
1199 
1200     dev_kfree_skb_any(pskb);
1201     if (sendrc == NET_RX_DROP) {
1202         dev_warn(&dev->dev,
1203             "The network backlog for %s is exceeded, "
1204             "package dropped\n", __func__);
1205         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1206     }
1207 
1208     CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1209             __func__, dev->name, ch, ch->id);
1210 }
1211 
1212 /*
1213  * tasklet helper for mpc's skb unpacking.
1214  *
1215  * ch       The channel to work on.
1216  * Allow flow control back pressure to occur here.
1217  * Throttling back channel can result in excessive
1218  * channel inactivity and system deact of channel
1219  */
1220 void ctcmpc_bh(unsigned long thischan)
1221 {
1222     struct channel    *ch   = (struct channel *)thischan;
1223     struct sk_buff    *skb;
1224     struct net_device *dev  = ch->netdev;
1225     struct ctcm_priv  *priv = dev->ml_priv;
1226     struct mpc_group  *grp  = priv->mpcg;
1227 
1228     CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1229            dev->name, smp_processor_id(), __func__, ch->id);
1230     /* caller has requested driver to throttle back */
1231     while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1232             (skb = skb_dequeue(&ch->io_queue))) {
1233         ctcmpc_unpack_skb(ch, skb);
1234         if (grp->out_of_sequence > 20) {
1235             /* assume data loss has occurred if */
1236             /* missing seq_num for extended     */
1237             /* period of time           */
1238             grp->out_of_sequence = 0;
1239             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1240             break;
1241         }
1242         if (skb == skb_peek(&ch->io_queue))
1243             break;
1244     }
1245     CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1246             __func__, dev->name, ch, ch->id);
1247     return;
1248 }
1249 
1250 /*
1251  *  MPC Group Initializations
1252  */
1253 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1254 {
1255     struct mpc_group *grp;
1256 
1257     CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1258             "Enter %s(%p)", CTCM_FUNTAIL, priv);
1259 
1260     grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1261     if (grp == NULL)
1262         return NULL;
1263 
1264     grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1265             MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1266             mpcg_fsm_len, GFP_KERNEL);
1267     if (grp->fsm == NULL) {
1268         kfree(grp);
1269         return NULL;
1270     }
1271 
1272     fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1273     fsm_settimer(grp->fsm, &grp->timer);
1274 
1275     grp->xid_skb =
1276          __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1277     if (grp->xid_skb == NULL) {
1278         kfree_fsm(grp->fsm);
1279         kfree(grp);
1280         return NULL;
1281     }
1282     /*  base xid for all channels in group  */
1283     grp->xid_skb_data = grp->xid_skb->data;
1284     grp->xid_th = (struct th_header *)grp->xid_skb->data;
1285     skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1286 
1287     grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1288     skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1289     grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1290     grp->xid->xid2_sender_id = jiffies;
1291 
1292     grp->xid_id = skb_tail_pointer(grp->xid_skb);
1293     skb_put_data(grp->xid_skb, "VTAM", 4);
1294 
1295     grp->rcvd_xid_skb =
1296         __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1297     if (grp->rcvd_xid_skb == NULL) {
1298         kfree_fsm(grp->fsm);
1299         dev_kfree_skb(grp->xid_skb);
1300         kfree(grp);
1301         return NULL;
1302     }
1303     grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1304     grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1305     skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1306     grp->saved_xid2 = NULL;
1307     priv->xid = grp->xid;
1308     priv->mpcg = grp;
1309     return grp;
1310 }
1311 
1312 /*
1313  * The MPC Group Station FSM
1314  */
1315 
1316 /*
1317  * MPC Group Station FSM actions
1318  * CTCM_PROTO_MPC only
1319  */
1320 
1321 /*
1322  * NOP action for statemachines
1323  */
1324 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1325 {
1326 }
1327 
1328 /*
1329  * invoked when the device transitions to dev_stopped
1330  * MPC will stop each individual channel if a single XID failure
1331  * occurs, or will intitiate all channels be stopped if a GROUP
1332  * level failure occurs.
1333  */
1334 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1335 {
1336     struct net_device  *dev = arg;
1337     struct ctcm_priv    *priv;
1338     struct mpc_group *grp;
1339     struct channel *wch;
1340 
1341     CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1342 
1343     priv  = dev->ml_priv;
1344     grp =  priv->mpcg;
1345     grp->flow_off_called = 0;
1346     fsm_deltimer(&grp->timer);
1347     if (grp->channels_terminating)
1348             return;
1349 
1350     grp->channels_terminating = 1;
1351     grp->saved_state = fsm_getstate(grp->fsm);
1352     fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1353     if (grp->saved_state > MPCG_STATE_XID7INITF)
1354         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1355             "%s(%s): MPC GROUP INOPERATIVE",
1356                 CTCM_FUNTAIL, dev->name);
1357     if ((grp->saved_state != MPCG_STATE_RESET) ||
1358         /* dealloc_channel has been called */
1359         (grp->port_persist == 0))
1360         fsm_deltimer(&priv->restart_timer);
1361 
1362     wch = priv->channel[CTCM_WRITE];
1363 
1364     switch (grp->saved_state) {
1365     case MPCG_STATE_RESET:
1366     case MPCG_STATE_INOP:
1367     case MPCG_STATE_XID2INITW:
1368     case MPCG_STATE_XID0IOWAIT:
1369     case MPCG_STATE_XID2INITX:
1370     case MPCG_STATE_XID7INITW:
1371     case MPCG_STATE_XID7INITX:
1372     case MPCG_STATE_XID0IOWAIX:
1373     case MPCG_STATE_XID7INITI:
1374     case MPCG_STATE_XID7INITZ:
1375     case MPCG_STATE_XID7INITF:
1376         break;
1377     case MPCG_STATE_FLOWC:
1378     case MPCG_STATE_READY:
1379     default:
1380         tasklet_hi_schedule(&wch->ch_disc_tasklet);
1381     }
1382 
1383     grp->xid2_tgnum = 0;
1384     grp->group_max_buflen = 0;  /*min of all received */
1385     grp->outstanding_xid2 = 0;
1386     grp->outstanding_xid7 = 0;
1387     grp->outstanding_xid7_p2 = 0;
1388     grp->saved_xid2 = NULL;
1389     grp->xidnogood = 0;
1390     grp->changed_side = 0;
1391 
1392     grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1393     skb_reset_tail_pointer(grp->rcvd_xid_skb);
1394     grp->rcvd_xid_skb->len = 0;
1395     grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1396     skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1397 
1398     if (grp->send_qllc_disc == 1) {
1399         grp->send_qllc_disc = 0;
1400         mpc_send_qllc_discontact(dev);
1401     }
1402 
1403     /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1404     /* This can result in INOP of VTAM PU due to halting of  */
1405     /* outstanding IO which causes a sense to be returned    */
1406     /* Only about 3 senses are allowed and then IOS/VTAM will*/
1407     /* become unreachable without manual intervention    */
1408     if ((grp->port_persist == 1) || (grp->alloc_called)) {
1409         grp->alloc_called = 0;
1410         fsm_deltimer(&priv->restart_timer);
1411         fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1412         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1413         if (grp->saved_state > MPCG_STATE_XID7INITF)
1414             CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1415                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1416                     CTCM_FUNTAIL, dev->name);
1417     } else {
1418         fsm_deltimer(&priv->restart_timer);
1419         fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1420         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1421         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1422             "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1423                         CTCM_FUNTAIL, dev->name);
1424     }
1425 }
1426 
1427 /*
1428  * Handle mpc group  action timeout.
1429  * MPC Group Station FSM action
1430  * CTCM_PROTO_MPC only
1431  *
1432  * fi       An instance of an mpc_group fsm.
1433  * event    The event, just happened.
1434  * arg      Generic pointer, casted from net_device * upon call.
1435  */
1436 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1437 {
1438     struct net_device *dev = arg;
1439     struct ctcm_priv *priv;
1440     struct mpc_group *grp;
1441     struct channel *wch;
1442     struct channel *rch;
1443 
1444     priv = dev->ml_priv;
1445     grp = priv->mpcg;
1446     wch = priv->channel[CTCM_WRITE];
1447     rch = priv->channel[CTCM_READ];
1448 
1449     switch (fsm_getstate(grp->fsm)) {
1450     case MPCG_STATE_XID2INITW:
1451         /* Unless there is outstanding IO on the  */
1452         /* channel just return and wait for ATTN  */
1453         /* interrupt to begin XID negotiations    */
1454         if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1455            (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1456             break;
1457         fallthrough;
1458     default:
1459         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1460     }
1461 
1462     CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1463             "%s: dev=%s exit",
1464             CTCM_FUNTAIL, dev->name);
1465     return;
1466 }
1467 
1468 /*
1469  * MPC Group Station FSM action
1470  * CTCM_PROTO_MPC only
1471  */
1472 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1473 {
1474     struct mpcg_info   *mpcginfo   = arg;
1475     struct channel     *ch         = mpcginfo->ch;
1476     struct net_device  *dev;
1477     struct ctcm_priv   *priv;
1478     struct mpc_group   *grp;
1479 
1480     if (ch) {
1481         dev = ch->netdev;
1482         if (dev) {
1483             priv = dev->ml_priv;
1484             if (priv) {
1485                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1486                     "%s: %s: %s\n",
1487                     CTCM_FUNTAIL, dev->name, ch->id);
1488                 grp = priv->mpcg;
1489                 grp->send_qllc_disc = 1;
1490                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1491             }
1492         }
1493     }
1494 
1495     return;
1496 }
1497 
1498 /*
1499  * MPC Group Station - not part of FSM
1500  * CTCM_PROTO_MPC only
1501  * called from add_channel in ctcm_main.c
1502  */
1503 void mpc_action_send_discontact(unsigned long thischan)
1504 {
1505     int rc;
1506     struct channel  *ch = (struct channel *)thischan;
1507     unsigned long   saveflags = 0;
1508 
1509     spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1510     rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1511     spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1512 
1513     if (rc != 0) {
1514         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1515     }
1516 
1517     return;
1518 }
1519 
1520 
1521 /*
1522  * helper function of mpc FSM
1523  * CTCM_PROTO_MPC only
1524  * mpc_action_rcvd_xid7
1525 */
1526 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1527 {
1528     struct channel     *ch   = mpcginfo->ch;
1529     struct net_device  *dev  = ch->netdev;
1530     struct ctcm_priv   *priv = dev->ml_priv;
1531     struct mpc_group   *grp  = priv->mpcg;
1532     struct xid2    *xid  = mpcginfo->xid;
1533     int rc   = 0;
1534     __u64   our_id   = 0;
1535     __u64   their_id = 0;
1536     int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1537 
1538     CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1539 
1540     if (xid == NULL) {
1541         rc = 1;
1542         /* XID REJECTED: xid == NULL */
1543         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1544             "%s(%s): xid = NULL",
1545                 CTCM_FUNTAIL, ch->id);
1546             goto done;
1547     }
1548 
1549     CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1550 
1551     /*the received direction should be the opposite of ours  */
1552     if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1553                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1554         rc = 2;
1555         /* XID REJECTED: r/w channel pairing mismatch */
1556         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1557             "%s(%s): r/w channel pairing mismatch",
1558                 CTCM_FUNTAIL, ch->id);
1559             goto done;
1560     }
1561 
1562     if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1563         CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1564                 grp->group_max_buflen, xid->xid2_buf_len);
1565 
1566         if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1567                         xid->xid2_buf_len - len)
1568             grp->group_max_buflen = xid->xid2_buf_len - len;
1569     }
1570 
1571     if (grp->saved_xid2 == NULL) {
1572         grp->saved_xid2 =
1573             (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1574 
1575         skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1576         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1577 
1578         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1579         grp->rcvd_xid_skb->len = 0;
1580 
1581         /* convert two 32 bit numbers into 1 64 bit for id compare */
1582         our_id = (__u64)priv->xid->xid2_adj_id;
1583         our_id = our_id << 32;
1584         our_id = our_id + priv->xid->xid2_sender_id;
1585         their_id = (__u64)xid->xid2_adj_id;
1586         their_id = their_id << 32;
1587         their_id = their_id + xid->xid2_sender_id;
1588         /* lower id assume the xside role */
1589         if (our_id < their_id) {
1590             grp->roll = XSIDE;
1591             CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1592                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1593                     CTCM_FUNTAIL, ch->id);
1594         } else {
1595             grp->roll = YSIDE;
1596             CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1597                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1598                     CTCM_FUNTAIL, ch->id);
1599         }
1600 
1601     } else {
1602         if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1603             rc = 3;
1604             /* XID REJECTED: xid flag byte4 mismatch */
1605             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1606                 "%s(%s): xid flag byte4 mismatch",
1607                     CTCM_FUNTAIL, ch->id);
1608         }
1609         if (xid->xid2_flag2 == 0x40) {
1610             rc = 4;
1611             /* XID REJECTED - xid NOGOOD */
1612             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1613                 "%s(%s): xid NOGOOD",
1614                     CTCM_FUNTAIL, ch->id);
1615         }
1616         if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1617             rc = 5;
1618             /* XID REJECTED - Adjacent Station ID Mismatch */
1619             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620                 "%s(%s): Adjacent Station ID Mismatch",
1621                     CTCM_FUNTAIL, ch->id);
1622         }
1623         if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1624             rc = 6;
1625             /* XID REJECTED - Sender Address Mismatch */
1626             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627                 "%s(%s): Sender Address Mismatch",
1628                     CTCM_FUNTAIL, ch->id);
1629         }
1630     }
1631 done:
1632     if (rc) {
1633         dev_warn(&dev->dev,
1634             "The XID used in the MPC protocol is not valid, "
1635             "rc = %d\n", rc);
1636         priv->xid->xid2_flag2 = 0x40;
1637         grp->saved_xid2->xid2_flag2 = 0x40;
1638     }
1639 
1640     return rc;
1641 }
1642 
1643 /*
1644  * MPC Group Station FSM action
1645  * CTCM_PROTO_MPC only
1646  */
1647 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1648 {
1649     struct channel *ch = arg;
1650     int rc = 0;
1651     int gotlock = 0;
1652     unsigned long saveflags = 0;    /* avoids compiler warning with
1653                        spin_unlock_irqrestore */
1654 
1655     CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1656             __func__, smp_processor_id(), ch, ch->id);
1657 
1658     if (ctcm_checkalloc_buffer(ch))
1659                     goto done;
1660 
1661     /*
1662      * skb data-buffer referencing:
1663      */
1664     ch->trans_skb->data = ch->trans_skb_data;
1665     skb_reset_tail_pointer(ch->trans_skb);
1666     ch->trans_skb->len = 0;
1667     /* result of the previous 3 statements is NOT always
1668      * already set after ctcm_checkalloc_buffer
1669      * because of possible reuse of the trans_skb
1670      */
1671     memset(ch->trans_skb->data, 0, 16);
1672     ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1673     /* check is main purpose here: */
1674     skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1675     ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1676     /* check is main purpose here: */
1677     skb_put(ch->trans_skb, XID2_LENGTH);
1678     ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1679     /* cleanup back to startpoint */
1680     ch->trans_skb->data = ch->trans_skb_data;
1681     skb_reset_tail_pointer(ch->trans_skb);
1682     ch->trans_skb->len = 0;
1683 
1684     /* non-checking rewrite of above skb data-buffer referencing: */
1685     /*
1686     memset(ch->trans_skb->data, 0, 16);
1687     ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1688     ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1689     ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1690      */
1691 
1692     ch->ccw[8].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1693     ch->ccw[8].count    = 0;
1694     ch->ccw[8].cda      = 0x00;
1695 
1696     if (!(ch->xid_th && ch->xid && ch->xid_id))
1697         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1698             "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1699             CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1700 
1701     if (side == XSIDE) {
1702         /* mpc_action_xside_xid */
1703         if (ch->xid_th == NULL)
1704                 goto done;
1705         ch->ccw[9].cmd_code = CCW_CMD_WRITE;
1706         ch->ccw[9].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1707         ch->ccw[9].count    = TH_HEADER_LENGTH;
1708         ch->ccw[9].cda      = virt_to_phys(ch->xid_th);
1709 
1710         if (ch->xid == NULL)
1711                 goto done;
1712         ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1713         ch->ccw[10].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1714         ch->ccw[10].count   = XID2_LENGTH;
1715         ch->ccw[10].cda     = virt_to_phys(ch->xid);
1716 
1717         ch->ccw[11].cmd_code    = CCW_CMD_READ;
1718         ch->ccw[11].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1719         ch->ccw[11].count   = TH_HEADER_LENGTH;
1720         ch->ccw[11].cda     = virt_to_phys(ch->rcvd_xid_th);
1721 
1722         ch->ccw[12].cmd_code    = CCW_CMD_READ;
1723         ch->ccw[12].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1724         ch->ccw[12].count   = XID2_LENGTH;
1725         ch->ccw[12].cda     = virt_to_phys(ch->rcvd_xid);
1726 
1727         ch->ccw[13].cmd_code    = CCW_CMD_READ;
1728         ch->ccw[13].cda     = virt_to_phys(ch->rcvd_xid_id);
1729 
1730     } else { /* side == YSIDE : mpc_action_yside_xid */
1731         ch->ccw[9].cmd_code = CCW_CMD_READ;
1732         ch->ccw[9].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1733         ch->ccw[9].count    = TH_HEADER_LENGTH;
1734         ch->ccw[9].cda      = virt_to_phys(ch->rcvd_xid_th);
1735 
1736         ch->ccw[10].cmd_code    = CCW_CMD_READ;
1737         ch->ccw[10].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1738         ch->ccw[10].count   = XID2_LENGTH;
1739         ch->ccw[10].cda     = virt_to_phys(ch->rcvd_xid);
1740 
1741         if (ch->xid_th == NULL)
1742                 goto done;
1743         ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1744         ch->ccw[11].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1745         ch->ccw[11].count   = TH_HEADER_LENGTH;
1746         ch->ccw[11].cda     = virt_to_phys(ch->xid_th);
1747 
1748         if (ch->xid == NULL)
1749                 goto done;
1750         ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1751         ch->ccw[12].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1752         ch->ccw[12].count   = XID2_LENGTH;
1753         ch->ccw[12].cda     = virt_to_phys(ch->xid);
1754 
1755         if (ch->xid_id == NULL)
1756                 goto done;
1757         ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1758         ch->ccw[13].cda     = virt_to_phys(ch->xid_id);
1759 
1760     }
1761     ch->ccw[13].flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1762     ch->ccw[13].count   = 4;
1763 
1764     ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1765     ch->ccw[14].flags   = CCW_FLAG_SLI;
1766     ch->ccw[14].count   = 0;
1767     ch->ccw[14].cda     = 0;
1768 
1769     CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1770     CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1771     CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1772     CTCM_D3_DUMP((char *)ch->xid_id, 4);
1773 
1774     if (!in_hardirq()) {
1775              /* Such conditional locking is a known problem for
1776               * sparse because its static undeterministic.
1777               * Warnings should be ignored here. */
1778         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1779         gotlock = 1;
1780     }
1781 
1782     fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1783     rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1784 
1785     if (gotlock)    /* see remark above about conditional locking */
1786         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1787 
1788     if (rc != 0) {
1789         ctcm_ccw_check_rc(ch, rc,
1790                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1791     }
1792 
1793 done:
1794     CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1795                 __func__, ch, ch->id);
1796     return;
1797 
1798 }
1799 
1800 /*
1801  * MPC Group Station FSM action
1802  * CTCM_PROTO_MPC only
1803  */
1804 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1805 {
1806     mpc_action_side_xid(fsm, arg, XSIDE);
1807 }
1808 
1809 /*
1810  * MPC Group Station FSM action
1811  * CTCM_PROTO_MPC only
1812  */
1813 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1814 {
1815     mpc_action_side_xid(fsm, arg, YSIDE);
1816 }
1817 
1818 /*
1819  * MPC Group Station FSM action
1820  * CTCM_PROTO_MPC only
1821  */
1822 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1823 {
1824     struct channel     *ch   = arg;
1825     struct net_device  *dev  = ch->netdev;
1826     struct ctcm_priv   *priv = dev->ml_priv;
1827     struct mpc_group   *grp  = priv->mpcg;
1828 
1829     CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1830             __func__, smp_processor_id(), ch, ch->id);
1831 
1832     if (ch->xid == NULL) {
1833         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1834             "%s(%s): ch->xid == NULL",
1835                 CTCM_FUNTAIL, dev->name);
1836         return;
1837     }
1838 
1839     fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1840 
1841     ch->xid->xid2_option =  XID2_0;
1842 
1843     switch (fsm_getstate(grp->fsm)) {
1844     case MPCG_STATE_XID2INITW:
1845     case MPCG_STATE_XID2INITX:
1846         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1847         break;
1848     case MPCG_STATE_XID0IOWAIT:
1849     case MPCG_STATE_XID0IOWAIX:
1850         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1851         break;
1852     }
1853 
1854     fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1855 
1856     return;
1857 }
1858 
1859 /*
1860  * MPC Group Station FSM action
1861  * CTCM_PROTO_MPC only
1862 */
1863 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1864 {
1865     struct net_device *dev = arg;
1866     struct ctcm_priv  *priv = dev->ml_priv;
1867     struct mpc_group  *grp  = NULL;
1868     int direction;
1869     int send = 0;
1870 
1871     if (priv)
1872         grp = priv->mpcg;
1873     if (grp == NULL)
1874         return;
1875 
1876     for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1877         struct channel *ch = priv->channel[direction];
1878         struct xid2 *thisxid = ch->xid;
1879         ch->xid_skb->data = ch->xid_skb_data;
1880         skb_reset_tail_pointer(ch->xid_skb);
1881         ch->xid_skb->len = 0;
1882         thisxid->xid2_option = XID2_7;
1883         send = 0;
1884 
1885         /* xid7 phase 1 */
1886         if (grp->outstanding_xid7_p2 > 0) {
1887             if (grp->roll == YSIDE) {
1888                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1889                     fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1890                     ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1891                     skb_put_data(ch->xid_skb, &thdummy,
1892                              TH_HEADER_LENGTH);
1893                     send = 1;
1894                 }
1895             } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1896                     fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1897                     ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1898                     skb_put_data(ch->xid_skb, &thnorm,
1899                              TH_HEADER_LENGTH);
1900                     send = 1;
1901             }
1902         } else {
1903             /* xid7 phase 2 */
1904             if (grp->roll == YSIDE) {
1905                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1906                     fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1907                     skb_put_data(ch->xid_skb, &thnorm,
1908                              TH_HEADER_LENGTH);
1909                     ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1910                     send = 1;
1911                 }
1912             } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1913                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1914                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1915                 skb_put_data(ch->xid_skb, &thdummy,
1916                          TH_HEADER_LENGTH);
1917                 send = 1;
1918             }
1919         }
1920 
1921         if (send)
1922             fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1923     }
1924 
1925     return;
1926 }
1927 
1928 /*
1929  * MPC Group Station FSM action
1930  * CTCM_PROTO_MPC only
1931  */
1932 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1933 {
1934 
1935     struct mpcg_info   *mpcginfo  = arg;
1936     struct channel     *ch   = mpcginfo->ch;
1937     struct net_device  *dev  = ch->netdev;
1938     struct ctcm_priv   *priv = dev->ml_priv;
1939     struct mpc_group   *grp  = priv->mpcg;
1940 
1941     CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1942             __func__, ch->id, grp->outstanding_xid2,
1943             grp->outstanding_xid7, grp->outstanding_xid7_p2);
1944 
1945     if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1946         fsm_newstate(ch->fsm, CH_XID7_PENDING);
1947 
1948     grp->outstanding_xid2--;
1949     grp->outstanding_xid7++;
1950     grp->outstanding_xid7_p2++;
1951 
1952     /* must change state before validating xid to */
1953     /* properly handle interim interrupts received*/
1954     switch (fsm_getstate(grp->fsm)) {
1955     case MPCG_STATE_XID2INITW:
1956         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1957         mpc_validate_xid(mpcginfo);
1958         break;
1959     case MPCG_STATE_XID0IOWAIT:
1960         fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1961         mpc_validate_xid(mpcginfo);
1962         break;
1963     case MPCG_STATE_XID2INITX:
1964         if (grp->outstanding_xid2 == 0) {
1965             fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1966             mpc_validate_xid(mpcginfo);
1967             fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1968         }
1969         break;
1970     case MPCG_STATE_XID0IOWAIX:
1971         if (grp->outstanding_xid2 == 0) {
1972             fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1973             mpc_validate_xid(mpcginfo);
1974             fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1975         }
1976         break;
1977     }
1978 
1979     CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1980         __func__, ch->id, grp->outstanding_xid2,
1981         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1982     CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1983         __func__, ch->id,
1984         fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1985     return;
1986 
1987 }
1988 
1989 
1990 /*
1991  * MPC Group Station FSM action
1992  * CTCM_PROTO_MPC only
1993  */
1994 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
1995 {
1996     struct mpcg_info   *mpcginfo   = arg;
1997     struct channel     *ch         = mpcginfo->ch;
1998     struct net_device  *dev        = ch->netdev;
1999     struct ctcm_priv   *priv    = dev->ml_priv;
2000     struct mpc_group   *grp     = priv->mpcg;
2001 
2002     CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2003         __func__, smp_processor_id(), ch, ch->id);
2004     CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2005         __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2006 
2007     grp->outstanding_xid7--;
2008     ch->xid_skb->data = ch->xid_skb_data;
2009     skb_reset_tail_pointer(ch->xid_skb);
2010     ch->xid_skb->len = 0;
2011 
2012     switch (fsm_getstate(grp->fsm)) {
2013     case MPCG_STATE_XID7INITI:
2014         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2015         mpc_validate_xid(mpcginfo);
2016         break;
2017     case MPCG_STATE_XID7INITW:
2018         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2019         mpc_validate_xid(mpcginfo);
2020         break;
2021     case MPCG_STATE_XID7INITZ:
2022     case MPCG_STATE_XID7INITX:
2023         if (grp->outstanding_xid7 == 0) {
2024             if (grp->outstanding_xid7_p2 > 0) {
2025                 grp->outstanding_xid7 =
2026                     grp->outstanding_xid7_p2;
2027                 grp->outstanding_xid7_p2 = 0;
2028             } else
2029                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2030 
2031             mpc_validate_xid(mpcginfo);
2032             fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2033             break;
2034         }
2035         mpc_validate_xid(mpcginfo);
2036         break;
2037     }
2038     return;
2039 }
2040 
2041 /*
2042  * mpc_action helper of an MPC Group Station FSM action
2043  * CTCM_PROTO_MPC only
2044  */
2045 static int mpc_send_qllc_discontact(struct net_device *dev)
2046 {
2047     struct sk_buff   *skb;
2048     struct qllc      *qllcptr;
2049     struct ctcm_priv *priv = dev->ml_priv;
2050     struct mpc_group *grp = priv->mpcg;
2051 
2052     CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2053         __func__, mpcg_state_names[grp->saved_state]);
2054 
2055     switch (grp->saved_state) {
2056     /*
2057      * establish conn callback function is
2058      * preferred method to report failure
2059      */
2060     case MPCG_STATE_XID0IOWAIT:
2061     case MPCG_STATE_XID0IOWAIX:
2062     case MPCG_STATE_XID7INITI:
2063     case MPCG_STATE_XID7INITZ:
2064     case MPCG_STATE_XID2INITW:
2065     case MPCG_STATE_XID2INITX:
2066     case MPCG_STATE_XID7INITW:
2067     case MPCG_STATE_XID7INITX:
2068         if (grp->estconnfunc) {
2069             grp->estconnfunc(grp->port_num, -1, 0);
2070             grp->estconnfunc = NULL;
2071             break;
2072         }
2073         fallthrough;
2074     case MPCG_STATE_FLOWC:
2075     case MPCG_STATE_READY:
2076         grp->send_qllc_disc = 2;
2077 
2078         skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2079         if (skb == NULL) {
2080             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2081                 "%s(%s): skb allocation error",
2082                         CTCM_FUNTAIL, dev->name);
2083             priv->stats.rx_dropped++;
2084             return -ENOMEM;
2085         }
2086 
2087         qllcptr = skb_put(skb, sizeof(struct qllc));
2088         qllcptr->qllc_address = 0xcc;
2089         qllcptr->qllc_commands = 0x03;
2090 
2091         if (skb_headroom(skb) < 4) {
2092             CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2093                 "%s(%s): skb_headroom error",
2094                         CTCM_FUNTAIL, dev->name);
2095             dev_kfree_skb_any(skb);
2096             return -ENOMEM;
2097         }
2098 
2099         *((__u32 *)skb_push(skb, 4)) =
2100             priv->channel[CTCM_READ]->pdu_seq;
2101         priv->channel[CTCM_READ]->pdu_seq++;
2102         CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2103                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2104 
2105         /* receipt of CC03 resets anticipated sequence number on
2106               receiving side */
2107         priv->channel[CTCM_READ]->pdu_seq = 0x00;
2108         skb_reset_mac_header(skb);
2109         skb->dev = dev;
2110         skb->protocol = htons(ETH_P_SNAP);
2111         skb->ip_summed = CHECKSUM_UNNECESSARY;
2112 
2113         CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2114 
2115         netif_rx(skb);
2116         break;
2117     default:
2118         break;
2119 
2120     }
2121 
2122     return 0;
2123 }
2124 /* --- This is the END my friend --- */
2125
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