diff options
Diffstat (limited to 'drivers/s390/net/ctcm_mpc.c')
| -rw-r--r-- | drivers/s390/net/ctcm_mpc.c | 2125 |
1 files changed, 2125 insertions, 0 deletions
diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c new file mode 100644 index 000000000..8ac213a55 --- /dev/null +++ b/drivers/s390/net/ctcm_mpc.c @@ -0,0 +1,2125 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2004, 2007 + * Authors: Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + */ + +/* + This module exports functions to be used by CCS: + EXPORT_SYMBOL(ctc_mpc_alloc_channel); + EXPORT_SYMBOL(ctc_mpc_establish_connectivity); + EXPORT_SYMBOL(ctc_mpc_dealloc_ch); + EXPORT_SYMBOL(ctc_mpc_flow_control); +*/ + +#undef DEBUG +#undef DEBUGDATA +#undef DEBUGCCW + +#define KMSG_COMPONENT "ctcm" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/timer.h> +#include <linux/sched.h> + +#include <linux/signal.h> +#include <linux/string.h> +#include <linux/proc_fs.h> + +#include <linux/ip.h> +#include <linux/if_arp.h> +#include <linux/tcp.h> +#include <linux/skbuff.h> +#include <linux/ctype.h> +#include <linux/netdevice.h> +#include <net/dst.h> + +#include <linux/io.h> /* instead of <asm/io.h> ok ? */ +#include <asm/ccwdev.h> +#include <asm/ccwgroup.h> +#include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */ +#include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */ +#include <linux/wait.h> +#include <linux/moduleparam.h> +#include <asm/idals.h> + +#include "ctcm_main.h" +#include "ctcm_mpc.h" +#include "ctcm_fsms.h" + +static const struct xid2 init_xid = { + .xid2_type_id = XID_FM2, + .xid2_len = 0x45, + .xid2_adj_id = 0, + .xid2_rlen = 0x31, + .xid2_resv1 = 0, + .xid2_flag1 = 0, + .xid2_fmtt = 0, + .xid2_flag4 = 0x80, + .xid2_resv2 = 0, + .xid2_tgnum = 0, + .xid2_sender_id = 0, + .xid2_flag2 = 0, + .xid2_option = XID2_0, + .xid2_resv3 = "\x00", + .xid2_resv4 = 0, + .xid2_dlc_type = XID2_READ_SIDE, + .xid2_resv5 = 0, + .xid2_mpc_flag = 0, + .xid2_resv6 = 0, + .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), +}; + +static const struct th_header thnorm = { + .th_seg = 0x00, + .th_ch_flag = TH_IS_XID, + .th_blk_flag = TH_DATA_IS_XID, + .th_is_xid = 0x01, + .th_seq_num = 0x00000000, +}; + +static const struct th_header thdummy = { + .th_seg = 0x00, + .th_ch_flag = 0x00, + .th_blk_flag = TH_DATA_IS_XID, + .th_is_xid = 0x01, + .th_seq_num = 0x00000000, +}; + +/* + * Definition of one MPC group + */ + +/* + * Compatibility macros for busy handling + * of network devices. + */ + +static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); + +/* + * MPC Group state machine actions (static prototypes) + */ +static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); +static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); +static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); +static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); +static int mpc_validate_xid(struct mpcg_info *mpcginfo); +static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); +static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); +static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); +static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); +static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); +static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); + +#ifdef DEBUGDATA +/*-------------------------------------------------------------------* +* Dump buffer format * +* * +*--------------------------------------------------------------------*/ +void ctcmpc_dumpit(char *buf, int len) +{ + __u32 ct, sw, rm, dup; + char *ptr, *rptr; + char tbuf[82], tdup[82]; + char addr[22]; + char boff[12]; + char bhex[82], duphex[82]; + char basc[40]; + + sw = 0; + rptr = ptr = buf; + rm = 16; + duphex[0] = 0x00; + dup = 0; + + for (ct = 0; ct < len; ct++, ptr++, rptr++) { + if (sw == 0) { + sprintf(addr, "%16.16llx", (__u64)rptr); + + sprintf(boff, "%4.4X", (__u32)ct); + bhex[0] = '\0'; + basc[0] = '\0'; + } + if ((sw == 4) || (sw == 12)) + strcat(bhex, " "); + if (sw == 8) + strcat(bhex, " "); + + sprintf(tbuf, "%2.2llX", (__u64)*ptr); + + tbuf[2] = '\0'; + strcat(bhex, tbuf); + if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) + basc[sw] = *ptr; + else + basc[sw] = '.'; + + basc[sw+1] = '\0'; + sw++; + rm--; + if (sw != 16) + continue; + if ((strcmp(duphex, bhex)) != 0) { + if (dup != 0) { + sprintf(tdup, + "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", + tdup); + } + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + dup = 0; + strcpy(duphex, bhex); + } else + dup++; + + sw = 0; + rm = 16; + } /* endfor */ + + if (sw != 0) { + for ( ; rm > 0; rm--, sw++) { + if ((sw == 4) || (sw == 12)) + strcat(bhex, " "); + if (sw == 8) + strcat(bhex, " "); + strcat(bhex, " "); + strcat(basc, " "); + } + if (dup != 0) { + sprintf(tdup, "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", tdup); + } + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + } else { + if (dup >= 1) { + sprintf(tdup, "Duplicate as above to %s", addr); + ctcm_pr_debug(" --- %s ---\n", tdup); + } + if (dup != 0) { + ctcm_pr_debug(" %s (+%s) : %s [%s]\n", + addr, boff, bhex, basc); + } + } + + return; + +} /* end of ctcmpc_dumpit */ +#endif + +#ifdef DEBUGDATA +/* + * Dump header and first 16 bytes of an sk_buff for debugging purposes. + * + * skb The sk_buff to dump. + * offset Offset relative to skb-data, where to start the dump. + */ +void ctcmpc_dump_skb(struct sk_buff *skb, int offset) +{ + __u8 *p = skb->data; + struct th_header *header; + struct pdu *pheader; + int bl = skb->len; + int i; + + if (p == NULL) + return; + + p += offset; + header = (struct th_header *)p; + + ctcm_pr_debug("dump:\n"); + ctcm_pr_debug("skb len=%d \n", skb->len); + if (skb->len > 2) { + switch (header->th_ch_flag) { + case TH_HAS_PDU: + break; + case 0x00: + case TH_IS_XID: + if ((header->th_blk_flag == TH_DATA_IS_XID) && + (header->th_is_xid == 0x01)) + goto dumpth; + case TH_SWEEP_REQ: + goto dumpth; + case TH_SWEEP_RESP: + goto dumpth; + default: + break; + } + + pheader = (struct pdu *)p; + ctcm_pr_debug("pdu->offset: %d hex: %04x\n", + pheader->pdu_offset, pheader->pdu_offset); + ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); + ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); + ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); + goto dumpdata; + +dumpth: + ctcm_pr_debug("th->seg : %02x\n", header->th_seg); + ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); + ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); + ctcm_pr_debug("th->type : %s\n", + (header->th_is_xid) ? "DATA" : "XID"); + ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); + + } +dumpdata: + if (bl > 32) + bl = 32; + ctcm_pr_debug("data: "); + for (i = 0; i < bl; i++) + ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); + ctcm_pr_debug("\n"); +} +#endif + +static struct net_device *ctcmpc_get_dev(int port_num) +{ + char device[20]; + struct net_device *dev; + struct ctcm_priv *priv; + + sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); + + dev = __dev_get_by_name(&init_net, device); + + if (dev == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s: Device not found by name: %s", + CTCM_FUNTAIL, device); + return NULL; + } + priv = dev->ml_priv; + if (priv == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): dev->ml_priv is NULL", + CTCM_FUNTAIL, device); + return NULL; + } + if (priv->mpcg == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): priv->mpcg is NULL", + CTCM_FUNTAIL, device); + return NULL; + } + return dev; +} + +/* + * ctc_mpc_alloc_channel + * (exported interface) + * + * Device Initialization : + * ACTPATH driven IO operations + */ +int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) +{ + struct net_device *dev; + struct mpc_group *grp; + struct ctcm_priv *priv; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return 1; + priv = dev->ml_priv; + grp = priv->mpcg; + + grp->allochanfunc = callback; + grp->port_num = port_num; + grp->port_persist = 1; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "%s(%s): state=%s", + CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_INOP: + /* Group is in the process of terminating */ + grp->alloc_called = 1; + break; + case MPCG_STATE_RESET: + /* MPC Group will transition to state */ + /* MPCG_STATE_XID2INITW iff the minimum number */ + /* of 1 read and 1 write channel have successfully*/ + /* activated */ + /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ + if (callback) + grp->send_qllc_disc = 1; + fallthrough; + case MPCG_STATE_XID0IOWAIT: + fsm_deltimer(&grp->timer); + grp->outstanding_xid2 = 0; + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + if (callback) + ctcm_open(dev); + fsm_event(priv->fsm, DEV_EVENT_START, dev); + break; + case MPCG_STATE_READY: + /* XID exchanges completed after PORT was activated */ + /* Link station already active */ + /* Maybe timing issue...retry callback */ + grp->allocchan_callback_retries++; + if (grp->allocchan_callback_retries < 4) { + if (grp->allochanfunc) + grp->allochanfunc(grp->port_num, + grp->group_max_buflen); + } else { + /* there are problems...bail out */ + /* there may be a state mismatch so restart */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + grp->allocchan_callback_retries = 0; + } + break; + } + + return 0; +} +EXPORT_SYMBOL(ctc_mpc_alloc_channel); + +/* + * ctc_mpc_establish_connectivity + * (exported interface) + */ +void ctc_mpc_establish_connectivity(int port_num, + void (*callback)(int, int, int)) +{ + struct net_device *dev; + struct mpc_group *grp; + struct ctcm_priv *priv; + struct channel *rch, *wch; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + rch = priv->channel[CTCM_READ]; + wch = priv->channel[CTCM_WRITE]; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "%s(%s): state=%s", + CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); + + grp->estconnfunc = callback; + grp->port_num = port_num; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_READY: + /* XID exchanges completed after PORT was activated */ + /* Link station already active */ + /* Maybe timing issue...retry callback */ + fsm_deltimer(&grp->timer); + grp->estconn_callback_retries++; + if (grp->estconn_callback_retries < 4) { + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 0, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } + } else { + /* there are problems...bail out */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + grp->estconn_callback_retries = 0; + } + break; + case MPCG_STATE_INOP: + case MPCG_STATE_RESET: + /* MPC Group is not ready to start XID - min num of */ + /* 1 read and 1 write channel have not been acquired*/ + + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): REJECTED - inactive channels", + CTCM_FUNTAIL, dev->name); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + break; + case MPCG_STATE_XID2INITW: + /* alloc channel was called but no XID exchange */ + /* has occurred. initiate xside XID exchange */ + /* make sure yside XID0 processing has not started */ + + if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || + (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): ABORT - PASSIVE XID", + CTCM_FUNTAIL, dev->name); + break; + } + grp->send_qllc_disc = 1; + fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + if ((rch->in_mpcgroup) && + (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); + else { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): RX-%s not ready for ACTIVE XID0", + CTCM_FUNTAIL, dev->name, rch->id); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + fsm_deltimer(&grp->timer); + goto done; + } + if ((wch->in_mpcgroup) && + (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); + else { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): WX-%s not ready for ACTIVE XID0", + CTCM_FUNTAIL, dev->name, wch->id); + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + } + fsm_deltimer(&grp->timer); + goto done; + } + break; + case MPCG_STATE_XID0IOWAIT: + /* already in active XID negotiations */ + default: + break; + } + +done: + CTCM_PR_DEBUG("Exit %s()\n", __func__); + return; +} +EXPORT_SYMBOL(ctc_mpc_establish_connectivity); + +/* + * ctc_mpc_dealloc_ch + * (exported interface) + */ +void ctc_mpc_dealloc_ch(int port_num) +{ + struct net_device *dev; + struct ctcm_priv *priv; + struct mpc_group *grp; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, + "%s: %s: refcount = %d\n", + CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); + + fsm_deltimer(&priv->restart_timer); + grp->channels_terminating = 0; + fsm_deltimer(&grp->timer); + grp->allochanfunc = NULL; + grp->estconnfunc = NULL; + grp->port_persist = 0; + grp->send_qllc_disc = 0; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + + ctcm_close(dev); + return; +} +EXPORT_SYMBOL(ctc_mpc_dealloc_ch); + +/* + * ctc_mpc_flow_control + * (exported interface) + */ +void ctc_mpc_flow_control(int port_num, int flowc) +{ + struct ctcm_priv *priv; + struct mpc_group *grp; + struct net_device *dev; + struct channel *rch; + int mpcg_state; + + dev = ctcmpc_get_dev(port_num); + if (dev == NULL) + return; + priv = dev->ml_priv; + grp = priv->mpcg; + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s: %s: flowc = %d", + CTCM_FUNTAIL, dev->name, flowc); + + rch = priv->channel[CTCM_READ]; + + mpcg_state = fsm_getstate(grp->fsm); + switch (flowc) { + case 1: + if (mpcg_state == MPCG_STATE_FLOWC) + break; + if (mpcg_state == MPCG_STATE_READY) { + if (grp->flow_off_called == 1) + grp->flow_off_called = 0; + else + fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); + break; + } + break; + case 0: + if (mpcg_state == MPCG_STATE_FLOWC) { + fsm_newstate(grp->fsm, MPCG_STATE_READY); + /* ensure any data that has accumulated */ + /* on the io_queue will now be sen t */ + tasklet_schedule(&rch->ch_tasklet); + } + /* possible race condition */ + if (mpcg_state == MPCG_STATE_READY) { + grp->flow_off_called = 1; + break; + } + break; + } + +} +EXPORT_SYMBOL(ctc_mpc_flow_control); + +static int mpc_send_qllc_discontact(struct net_device *); + +/* + * helper function of ctcmpc_unpack_skb +*/ +static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) +{ + struct channel *rch = mpcginfo->ch; + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = priv->channel[CTCM_WRITE]; + + CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); + CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); + + grp->sweep_rsp_pend_num--; + + if ((grp->sweep_req_pend_num == 0) && + (grp->sweep_rsp_pend_num == 0)) { + fsm_deltimer(&ch->sweep_timer); + grp->in_sweep = 0; + rch->th_seq_num = 0x00; + ch->th_seq_num = 0x00; + ctcm_clear_busy_do(dev); + } + + return; + +} + +/* + * helper function of mpc_rcvd_sweep_req + * which is a helper of ctcmpc_unpack_skb + */ +static void ctcmpc_send_sweep_resp(struct channel *rch) +{ + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct th_sweep *header; + struct sk_buff *sweep_skb; + struct channel *ch = priv->channel[CTCM_WRITE]; + + CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); + + sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); + if (sweep_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): sweep_skb allocation ERROR\n", + CTCM_FUNTAIL, rch->id); + goto done; + } + + header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH); + header->th.th_ch_flag = TH_SWEEP_RESP; + header->sw.th_last_seq = ch->th_seq_num; + + netif_trans_update(dev); + skb_queue_tail(&ch->sweep_queue, sweep_skb); + + fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); + + return; + +done: + grp->in_sweep = 0; + ctcm_clear_busy_do(dev); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + + return; +} + +/* + * helper function of ctcmpc_unpack_skb + */ +static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) +{ + struct channel *rch = mpcginfo->ch; + struct net_device *dev = rch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = priv->channel[CTCM_WRITE]; + + if (do_debug) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); + + if (grp->in_sweep == 0) { + grp->in_sweep = 1; + ctcm_test_and_set_busy(dev); + grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; + grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; + } + + CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); + + grp->sweep_req_pend_num--; + ctcmpc_send_sweep_resp(ch); + kfree(mpcginfo); + return; +} + +/* + * MPC Group Station FSM definitions + */ +static const char *mpcg_event_names[] = { + [MPCG_EVENT_INOP] = "INOP Condition", + [MPCG_EVENT_DISCONC] = "Discontact Received", + [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", + [MPCG_EVENT_XID2] = "XID2 Received", + [MPCG_EVENT_XID2DONE] = "XID0 Complete", + [MPCG_EVENT_XID7DONE] = "XID7 Complete", + [MPCG_EVENT_TIMER] = "XID Setup Timer", + [MPCG_EVENT_DOIO] = "XID DoIO", +}; + +static const char *mpcg_state_names[] = { + [MPCG_STATE_RESET] = "Reset", + [MPCG_STATE_INOP] = "INOP", + [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", + [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", + [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", + [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", + [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", + [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", + [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", + [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", + [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", + [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", + [MPCG_STATE_READY] = "READY", +}; + +/* + * The MPC Group Station FSM + * 22 events + */ +static const fsm_node mpcg_fsm[] = { + { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, + { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, + + { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, + + { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, + + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, + { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, + + { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, + { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, +}; + +static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + fsm_deltimer(&grp->timer); + + if (grp->saved_xid2->xid2_flag2 == 0x40) { + priv->xid->xid2_flag2 = 0x00; + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 1, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } else if (grp->allochanfunc) + grp->send_qllc_disc = 1; + + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): fails", + CTCM_FUNTAIL, dev->name); + return; + } + + grp->port_persist = 1; + grp->out_of_sequence = 0; + grp->estconn_called = 0; + + tasklet_hi_schedule(&grp->mpc_tasklet2); + + return; +} + +/* + * helper of ctcm_init_netdevice + * CTCM_PROTO_MPC only + */ +void mpc_group_ready(unsigned long adev) +{ + struct net_device *dev = (struct net_device *)adev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *ch = NULL; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, + "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", + CTCM_FUNTAIL, dev->name, grp->group_max_buflen); + + fsm_newstate(grp->fsm, MPCG_STATE_READY); + + /* Put up a read on the channel */ + ch = priv->channel[CTCM_READ]; + ch->pdu_seq = 0; + CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , + __func__, ch->pdu_seq); + + ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); + /* Put the write channel in idle state */ + ch = priv->channel[CTCM_WRITE]; + if (ch->collect_len > 0) { + spin_lock(&ch->collect_lock); + ctcm_purge_skb_queue(&ch->collect_queue); + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + } + ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); + ctcm_clear_busy(dev); + + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, 0, + grp->group_max_buflen); + grp->estconnfunc = NULL; + } else if (grp->allochanfunc) + grp->allochanfunc(grp->port_num, grp->group_max_buflen); + + grp->send_qllc_disc = 1; + grp->changed_side = 0; + + return; + +} + +/* + * Increment the MPC Group Active Channel Counts + * helper of dev_action (called from channel fsm) + */ +void mpc_channel_action(struct channel *ch, int direction, int action) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + if (grp == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): No MPC group", + CTCM_FUNTAIL, dev->name); + return; + } + + CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s: %i / Grp:%s total_channels=%i, active_channels: " + "read=%i, write=%i\n", __func__, action, + fsm_getstate_str(grp->fsm), grp->num_channel_paths, + grp->active_channels[CTCM_READ], + grp->active_channels[CTCM_WRITE]); + + if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { + grp->num_channel_paths++; + grp->active_channels[direction]++; + grp->outstanding_xid2++; + ch->in_mpcgroup = 1; + + if (ch->xid_skb != NULL) + dev_kfree_skb_any(ch->xid_skb); + + ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, + GFP_ATOMIC | GFP_DMA); + if (ch->xid_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Couldn't alloc ch xid_skb\n", + CTCM_FUNTAIL, dev->name); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + return; + } + ch->xid_skb_data = ch->xid_skb->data; + ch->xid_th = (struct th_header *)ch->xid_skb->data; + skb_put(ch->xid_skb, TH_HEADER_LENGTH); + ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); + skb_put(ch->xid_skb, XID2_LENGTH); + ch->xid_id = skb_tail_pointer(ch->xid_skb); + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + skb_put_data(ch->xid_skb, grp->xid_skb->data, + grp->xid_skb->len); + + ch->xid->xid2_dlc_type = + ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? XID2_READ_SIDE : XID2_WRITE_SIDE); + + if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) + ch->xid->xid2_buf_len = 0x00; + + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + fsm_newstate(ch->fsm, CH_XID0_PENDING); + + if ((grp->active_channels[CTCM_READ] > 0) && + (grp->active_channels[CTCM_WRITE] > 0) && + (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, + "%s: %s: MPC GROUP CHANNELS ACTIVE\n", + __func__, dev->name); + } + } else if ((action == MPC_CHANNEL_REMOVE) && + (ch->in_mpcgroup == 1)) { + ch->in_mpcgroup = 0; + grp->num_channel_paths--; + grp->active_channels[direction]--; + + if (ch->xid_skb != NULL) + dev_kfree_skb_any(ch->xid_skb); + ch->xid_skb = NULL; + + if (grp->channels_terminating) + goto done; + + if (((grp->active_channels[CTCM_READ] == 0) && + (grp->active_channels[CTCM_WRITE] > 0)) + || ((grp->active_channels[CTCM_WRITE] == 0) && + (grp->active_channels[CTCM_READ] > 0))) + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } +done: + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "exit %s: %i / Grp:%s total_channels=%i, active_channels: " + "read=%i, write=%i\n", __func__, action, + fsm_getstate_str(grp->fsm), grp->num_channel_paths, + grp->active_channels[CTCM_READ], + grp->active_channels[CTCM_WRITE]); + + CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); +} + +/* + * Unpack a just received skb and hand it over to + * upper layers. + * special MPC version of unpack_skb. + * + * ch The channel where this skb has been received. + * pskb The received skb. + */ +static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct pdu *curr_pdu; + struct mpcg_info *mpcginfo; + struct th_header *header = NULL; + struct th_sweep *sweep = NULL; + int pdu_last_seen = 0; + __u32 new_len; + struct sk_buff *skb; + int skblen; + int sendrc = 0; + + CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", + __func__, dev->name, smp_processor_id(), ch->id); + + header = (struct th_header *)pskb->data; + if ((header->th_seg == 0) && + (header->th_ch_flag == 0) && + (header->th_blk_flag == 0) && + (header->th_seq_num == 0)) + /* nothing for us */ goto done; + + CTCM_PR_DBGDATA("%s: th_header\n", __func__); + CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); + CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); + + pskb->dev = dev; + pskb->ip_summed = CHECKSUM_UNNECESSARY; + skb_pull(pskb, TH_HEADER_LENGTH); + + if (likely(header->th_ch_flag == TH_HAS_PDU)) { + CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); + if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || + ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && + (header->th_seq_num != ch->th_seq_num + 1) && + (ch->th_seq_num != 0))) { + /* This is NOT the next segment * + * we are not the correct race winner * + * go away and let someone else win * + * BUT..this only applies if xid negot * + * is done * + */ + grp->out_of_sequence += 1; + __skb_push(pskb, TH_HEADER_LENGTH); + skb_queue_tail(&ch->io_queue, pskb); + CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " + "got:%08x\n", __func__, + ch->th_seq_num + 1, header->th_seq_num); + + return; + } + grp->out_of_sequence = 0; + ch->th_seq_num = header->th_seq_num; + + CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", + __func__, ch->th_seq_num); + + if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) + goto done; + while ((pskb->len > 0) && !pdu_last_seen) { + curr_pdu = (struct pdu *)pskb->data; + + CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); + CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); + CTCM_PR_DBGDATA("%s: pskb len: %04x \n", + __func__, pskb->len); + + skb_pull(pskb, PDU_HEADER_LENGTH); + + if (curr_pdu->pdu_flag & PDU_LAST) + pdu_last_seen = 1; + if (curr_pdu->pdu_flag & PDU_CNTL) + pskb->protocol = htons(ETH_P_SNAP); + else + pskb->protocol = htons(ETH_P_SNA_DIX); + + if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Dropping packet with " + "illegal siize %d", + CTCM_FUNTAIL, dev->name, pskb->len); + + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto done; + } + skb_reset_mac_header(pskb); + new_len = curr_pdu->pdu_offset; + CTCM_PR_DBGDATA("%s: new_len: %04x \n", + __func__, new_len); + if ((new_len == 0) || (new_len > pskb->len)) { + /* should never happen */ + /* pskb len must be hosed...bail out */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): non valid pdu_offset: %04x", + /* "data may be lost", */ + CTCM_FUNTAIL, dev->name, new_len); + goto done; + } + skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); + + if (!skb) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): MEMORY allocation error", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + skb_put_data(skb, pskb->data, new_len); + + skb_reset_mac_header(skb); + skb->dev = pskb->dev; + skb->protocol = pskb->protocol; + skb->ip_summed = CHECKSUM_UNNECESSARY; + *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; + ch->pdu_seq++; + + if (do_debug_data) { + ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", + __func__, ch->pdu_seq); + ctcm_pr_debug("%s: skb:%0lx " + "skb len: %d \n", __func__, + (unsigned long)skb, skb->len); + ctcm_pr_debug("%s: up to 32 bytes " + "of pdu_data sent\n", __func__); + ctcmpc_dump32((char *)skb->data, skb->len); + } + + skblen = skb->len; + sendrc = netif_rx(skb); + priv->stats.rx_packets++; + priv->stats.rx_bytes += skblen; + skb_pull(pskb, new_len); /* point to next PDU */ + } + } else { + mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC); + if (mpcginfo == NULL) + goto done; + + mpcginfo->ch = ch; + mpcginfo->th = header; + mpcginfo->skb = pskb; + CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", + __func__); + /* it's a sweep? */ + sweep = (struct th_sweep *)pskb->data; + mpcginfo->sweep = sweep; + if (header->th_ch_flag == TH_SWEEP_REQ) + mpc_rcvd_sweep_req(mpcginfo); + else if (header->th_ch_flag == TH_SWEEP_RESP) + mpc_rcvd_sweep_resp(mpcginfo); + else if (header->th_blk_flag == TH_DATA_IS_XID) { + struct xid2 *thisxid = (struct xid2 *)pskb->data; + skb_pull(pskb, XID2_LENGTH); + mpcginfo->xid = thisxid; + fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); + } else if (header->th_blk_flag == TH_DISCONTACT) + fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); + else if (header->th_seq_num != 0) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): control pkt expected\n", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + /* mpcginfo only used for non-data transfers */ + if (do_debug_data) + ctcmpc_dump_skb(pskb, -8); + } + kfree(mpcginfo); + } +done: + + dev_kfree_skb_any(pskb); + if (sendrc == NET_RX_DROP) { + dev_warn(&dev->dev, + "The network backlog for %s is exceeded, " + "package dropped\n", __func__); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + + CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", + __func__, dev->name, ch, ch->id); +} + +/* + * tasklet helper for mpc's skb unpacking. + * + * ch The channel to work on. + * Allow flow control back pressure to occur here. + * Throttling back channel can result in excessive + * channel inactivity and system deact of channel + */ +void ctcmpc_bh(unsigned long thischan) +{ + struct channel *ch = (struct channel *)thischan; + struct sk_buff *skb; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", + dev->name, smp_processor_id(), __func__, ch->id); + /* caller has requested driver to throttle back */ + while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && + (skb = skb_dequeue(&ch->io_queue))) { + ctcmpc_unpack_skb(ch, skb); + if (grp->out_of_sequence > 20) { + /* assume data loss has occurred if */ + /* missing seq_num for extended */ + /* period of time */ + grp->out_of_sequence = 0; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + break; + } + if (skb == skb_peek(&ch->io_queue)) + break; + } + CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", + __func__, dev->name, ch, ch->id); + return; +} + +/* + * MPC Group Initializations + */ +struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) +{ + struct mpc_group *grp; + + CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, + "Enter %s(%p)", CTCM_FUNTAIL, priv); + + grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); + if (grp == NULL) + return NULL; + + grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, + MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, + mpcg_fsm_len, GFP_KERNEL); + if (grp->fsm == NULL) { + kfree(grp); + return NULL; + } + + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + fsm_settimer(grp->fsm, &grp->timer); + + grp->xid_skb = + __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); + if (grp->xid_skb == NULL) { + kfree_fsm(grp->fsm); + kfree(grp); + return NULL; + } + /* base xid for all channels in group */ + grp->xid_skb_data = grp->xid_skb->data; + grp->xid_th = (struct th_header *)grp->xid_skb->data; + skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); + + grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); + skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); + grp->xid->xid2_adj_id = jiffies | 0xfff00000; + grp->xid->xid2_sender_id = jiffies; + + grp->xid_id = skb_tail_pointer(grp->xid_skb); + skb_put_data(grp->xid_skb, "VTAM", 4); + + grp->rcvd_xid_skb = + __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); + if (grp->rcvd_xid_skb == NULL) { + kfree_fsm(grp->fsm); + dev_kfree_skb(grp->xid_skb); + kfree(grp); + return NULL; + } + grp->rcvd_xid_data = grp->rcvd_xid_skb->data; + grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; + skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); + grp->saved_xid2 = NULL; + priv->xid = grp->xid; + priv->mpcg = grp; + return grp; +} + +/* + * The MPC Group Station FSM + */ + +/* + * MPC Group Station FSM actions + * CTCM_PROTO_MPC only + */ + +/* + * NOP action for statemachines + */ +static void mpc_action_nop(fsm_instance *fi, int event, void *arg) +{ +} + +/* + * invoked when the device transitions to dev_stopped + * MPC will stop each individual channel if a single XID failure + * occurs, or will intitiate all channels be stopped if a GROUP + * level failure occurs. + */ +static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv; + struct mpc_group *grp; + struct channel *wch; + + CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); + + priv = dev->ml_priv; + grp = priv->mpcg; + grp->flow_off_called = 0; + fsm_deltimer(&grp->timer); + if (grp->channels_terminating) + return; + + grp->channels_terminating = 1; + grp->saved_state = fsm_getstate(grp->fsm); + fsm_newstate(grp->fsm, MPCG_STATE_INOP); + if (grp->saved_state > MPCG_STATE_XID7INITF) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): MPC GROUP INOPERATIVE", + CTCM_FUNTAIL, dev->name); + if ((grp->saved_state != MPCG_STATE_RESET) || + /* dealloc_channel has been called */ + (grp->port_persist == 0)) + fsm_deltimer(&priv->restart_timer); + + wch = priv->channel[CTCM_WRITE]; + + switch (grp->saved_state) { + case MPCG_STATE_RESET: + case MPCG_STATE_INOP: + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID7INITF: + break; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + default: + tasklet_hi_schedule(&wch->ch_disc_tasklet); + } + + grp->xid2_tgnum = 0; + grp->group_max_buflen = 0; /*min of all received */ + grp->outstanding_xid2 = 0; + grp->outstanding_xid7 = 0; + grp->outstanding_xid7_p2 = 0; + grp->saved_xid2 = NULL; + grp->xidnogood = 0; + grp->changed_side = 0; + + grp->rcvd_xid_skb->data = grp->rcvd_xid_data; + skb_reset_tail_pointer(grp->rcvd_xid_skb); + grp->rcvd_xid_skb->len = 0; + grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; + skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); + + if (grp->send_qllc_disc == 1) { + grp->send_qllc_disc = 0; + mpc_send_qllc_discontact(dev); + } + + /* DO NOT issue DEV_EVENT_STOP directly out of this code */ + /* This can result in INOP of VTAM PU due to halting of */ + /* outstanding IO which causes a sense to be returned */ + /* Only about 3 senses are allowed and then IOS/VTAM will*/ + /* become unreachable without manual intervention */ + if ((grp->port_persist == 1) || (grp->alloc_called)) { + grp->alloc_called = 0; + fsm_deltimer(&priv->restart_timer); + fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + if (grp->saved_state > MPCG_STATE_XID7INITF) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, + "%s(%s): MPC GROUP RECOVERY SCHEDULED", + CTCM_FUNTAIL, dev->name); + } else { + fsm_deltimer(&priv->restart_timer); + fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); + fsm_newstate(grp->fsm, MPCG_STATE_RESET); + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, + "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", + CTCM_FUNTAIL, dev->name); + } +} + +/* + * Handle mpc group action timeout. + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + * + * fi An instance of an mpc_group fsm. + * event The event, just happened. + * arg Generic pointer, casted from net_device * upon call. + */ +static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv; + struct mpc_group *grp; + struct channel *wch; + struct channel *rch; + + priv = dev->ml_priv; + grp = priv->mpcg; + wch = priv->channel[CTCM_WRITE]; + rch = priv->channel[CTCM_READ]; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + /* Unless there is outstanding IO on the */ + /* channel just return and wait for ATTN */ + /* interrupt to begin XID negotiations */ + if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && + (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) + break; + fallthrough; + default: + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s: dev=%s exit", + CTCM_FUNTAIL, dev->name); + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +void mpc_action_discontact(fsm_instance *fi, int event, void *arg) +{ + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev; + struct ctcm_priv *priv; + struct mpc_group *grp; + + if (ch) { + dev = ch->netdev; + if (dev) { + priv = dev->ml_priv; + if (priv) { + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s: %s: %s\n", + CTCM_FUNTAIL, dev->name, ch->id); + grp = priv->mpcg; + grp->send_qllc_disc = 1; + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + } + } + } + + return; +} + +/* + * MPC Group Station - not part of FSM + * CTCM_PROTO_MPC only + * called from add_channel in ctcm_main.c + */ +void mpc_action_send_discontact(unsigned long thischan) +{ + int rc; + struct channel *ch = (struct channel *)thischan; + unsigned long saveflags = 0; + + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + + if (rc != 0) { + ctcm_ccw_check_rc(ch, rc, (char *)__func__); + } + + return; +} + + +/* + * helper function of mpc FSM + * CTCM_PROTO_MPC only + * mpc_action_rcvd_xid7 +*/ +static int mpc_validate_xid(struct mpcg_info *mpcginfo) +{ + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct xid2 *xid = mpcginfo->xid; + int rc = 0; + __u64 our_id = 0; + __u64 their_id = 0; + int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; + + CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); + + if (xid == NULL) { + rc = 1; + /* XID REJECTED: xid == NULL */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid = NULL", + CTCM_FUNTAIL, ch->id); + goto done; + } + + CTCM_D3_DUMP((char *)xid, XID2_LENGTH); + + /*the received direction should be the opposite of ours */ + if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : + XID2_READ_SIDE) != xid->xid2_dlc_type) { + rc = 2; + /* XID REJECTED: r/w channel pairing mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): r/w channel pairing mismatch", + CTCM_FUNTAIL, ch->id); + goto done; + } + + if (xid->xid2_dlc_type == XID2_READ_SIDE) { + CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, + grp->group_max_buflen, xid->xid2_buf_len); + + if (grp->group_max_buflen == 0 || grp->group_max_buflen > + xid->xid2_buf_len - len) + grp->group_max_buflen = xid->xid2_buf_len - len; + } + + if (grp->saved_xid2 == NULL) { + grp->saved_xid2 = + (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); + + skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); + grp->rcvd_xid_skb->data = grp->rcvd_xid_data; + + skb_reset_tail_pointer(grp->rcvd_xid_skb); + grp->rcvd_xid_skb->len = 0; + + /* convert two 32 bit numbers into 1 64 bit for id compare */ + our_id = (__u64)priv->xid->xid2_adj_id; + our_id = our_id << 32; + our_id = our_id + priv->xid->xid2_sender_id; + their_id = (__u64)xid->xid2_adj_id; + their_id = their_id << 32; + their_id = their_id + xid->xid2_sender_id; + /* lower id assume the xside role */ + if (our_id < their_id) { + grp->roll = XSIDE; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): WE HAVE LOW ID - TAKE XSIDE", + CTCM_FUNTAIL, ch->id); + } else { + grp->roll = YSIDE; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, + "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", + CTCM_FUNTAIL, ch->id); + } + + } else { + if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { + rc = 3; + /* XID REJECTED: xid flag byte4 mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid flag byte4 mismatch", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_flag2 == 0x40) { + rc = 4; + /* XID REJECTED - xid NOGOOD */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): xid NOGOOD", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { + rc = 5; + /* XID REJECTED - Adjacent Station ID Mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Adjacent Station ID Mismatch", + CTCM_FUNTAIL, ch->id); + } + if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { + rc = 6; + /* XID REJECTED - Sender Address Mismatch */ + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): Sender Address Mismatch", + CTCM_FUNTAIL, ch->id); + } + } +done: + if (rc) { + dev_warn(&dev->dev, + "The XID used in the MPC protocol is not valid, " + "rc = %d\n", rc); + priv->xid->xid2_flag2 = 0x40; + grp->saved_xid2->xid2_flag2 = 0x40; + } + + return rc; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) +{ + struct channel *ch = arg; + int rc = 0; + int gotlock = 0; + unsigned long saveflags = 0; /* avoids compiler warning with + spin_unlock_irqrestore */ + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + if (ctcm_checkalloc_buffer(ch)) + goto done; + + /* + * skb data-buffer referencing: + */ + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + /* result of the previous 3 statements is NOT always + * already set after ctcm_checkalloc_buffer + * because of possible reuse of the trans_skb + */ + memset(ch->trans_skb->data, 0, 16); + ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; + /* check is main purpose here: */ + skb_put(ch->trans_skb, TH_HEADER_LENGTH); + ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); + /* check is main purpose here: */ + skb_put(ch->trans_skb, XID2_LENGTH); + ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); + /* cleanup back to startpoint */ + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + + /* non-checking rewrite of above skb data-buffer referencing: */ + /* + memset(ch->trans_skb->data, 0, 16); + ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; + ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); + ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; + */ + + ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[8].count = 0; + ch->ccw[8].cda = 0x00; + + if (!(ch->xid_th && ch->xid && ch->xid_id)) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, + "%s(%s): xid_th=%p, xid=%p, xid_id=%p", + CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); + + if (side == XSIDE) { + /* mpc_action_xside_xid */ + if (ch->xid_th == NULL) + goto done; + ch->ccw[9].cmd_code = CCW_CMD_WRITE; + ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[9].count = TH_HEADER_LENGTH; + ch->ccw[9].cda = virt_to_phys(ch->xid_th); + + if (ch->xid == NULL) + goto done; + ch->ccw[10].cmd_code = CCW_CMD_WRITE; + ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[10].count = XID2_LENGTH; + ch->ccw[10].cda = virt_to_phys(ch->xid); + + ch->ccw[11].cmd_code = CCW_CMD_READ; + ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[11].count = TH_HEADER_LENGTH; + ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); + + ch->ccw[12].cmd_code = CCW_CMD_READ; + ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[12].count = XID2_LENGTH; + ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); + + ch->ccw[13].cmd_code = CCW_CMD_READ; + ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); + + } else { /* side == YSIDE : mpc_action_yside_xid */ + ch->ccw[9].cmd_code = CCW_CMD_READ; + ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[9].count = TH_HEADER_LENGTH; + ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); + + ch->ccw[10].cmd_code = CCW_CMD_READ; + ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[10].count = XID2_LENGTH; + ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); + + if (ch->xid_th == NULL) + goto done; + ch->ccw[11].cmd_code = CCW_CMD_WRITE; + ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[11].count = TH_HEADER_LENGTH; + ch->ccw[11].cda = virt_to_phys(ch->xid_th); + + if (ch->xid == NULL) + goto done; + ch->ccw[12].cmd_code = CCW_CMD_WRITE; + ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[12].count = XID2_LENGTH; + ch->ccw[12].cda = virt_to_phys(ch->xid); + + if (ch->xid_id == NULL) + goto done; + ch->ccw[13].cmd_code = CCW_CMD_WRITE; + ch->ccw[13].cda = virt_to_phys(ch->xid_id); + + } + ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[13].count = 4; + + ch->ccw[14].cmd_code = CCW_CMD_NOOP; + ch->ccw[14].flags = CCW_FLAG_SLI; + ch->ccw[14].count = 0; + ch->ccw[14].cda = 0; + + CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); + CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); + CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); + CTCM_D3_DUMP((char *)ch->xid_id, 4); + + if (!in_hardirq()) { + /* Such conditional locking is a known problem for + * sparse because its static undeterministic. + * Warnings should be ignored here. */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + gotlock = 1; + } + + fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); + rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0); + + if (gotlock) /* see remark above about conditional locking */ + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + + if (rc != 0) { + ctcm_ccw_check_rc(ch, rc, + (side == XSIDE) ? "x-side XID" : "y-side XID"); + } + +done: + CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", + __func__, ch, ch->id); + return; + +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) +{ + mpc_action_side_xid(fsm, arg, XSIDE); +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) +{ + mpc_action_side_xid(fsm, arg, YSIDE); +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + if (ch->xid == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): ch->xid == NULL", + CTCM_FUNTAIL, dev->name); + return; + } + + fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); + + ch->xid->xid2_option = XID2_0; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID2INITX: + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + break; + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + break; + } + + fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); + + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only +*/ +static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = NULL; + int direction; + int send = 0; + + if (priv) + grp = priv->mpcg; + if (grp == NULL) + return; + + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + struct xid2 *thisxid = ch->xid; + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + thisxid->xid2_option = XID2_7; + send = 0; + + /* xid7 phase 1 */ + if (grp->outstanding_xid7_p2 > 0) { + if (grp->roll == YSIDE) { + if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { + fsm_newstate(ch->fsm, CH_XID7_PENDING2); + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + skb_put_data(ch->xid_skb, &thdummy, + TH_HEADER_LENGTH); + send = 1; + } + } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { + fsm_newstate(ch->fsm, CH_XID7_PENDING2); + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + skb_put_data(ch->xid_skb, &thnorm, + TH_HEADER_LENGTH); + send = 1; + } + } else { + /* xid7 phase 2 */ + if (grp->roll == YSIDE) { + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { + fsm_newstate(ch->fsm, CH_XID7_PENDING4); + skb_put_data(ch->xid_skb, &thnorm, + TH_HEADER_LENGTH); + ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; + send = 1; + } + } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { + fsm_newstate(ch->fsm, CH_XID7_PENDING4); + ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; + skb_put_data(ch->xid_skb, &thdummy, + TH_HEADER_LENGTH); + send = 1; + } + } + + if (send) + fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); + } + + return; +} + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) +{ + + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", + __func__, ch->id, grp->outstanding_xid2, + grp->outstanding_xid7, grp->outstanding_xid7_p2); + + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) + fsm_newstate(ch->fsm, CH_XID7_PENDING); + + grp->outstanding_xid2--; + grp->outstanding_xid7++; + grp->outstanding_xid7_p2++; + + /* must change state before validating xid to */ + /* properly handle interim interrupts received*/ + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID0IOWAIT: + fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID2INITX: + if (grp->outstanding_xid2 == 0) { + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); + } + break; + case MPCG_STATE_XID0IOWAIX: + if (grp->outstanding_xid2 == 0) { + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); + } + break; + } + + CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", + __func__, ch->id, grp->outstanding_xid2, + grp->outstanding_xid7, grp->outstanding_xid7_p2); + CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", + __func__, ch->id, + fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); + return; + +} + + +/* + * MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) +{ + struct mpcg_info *mpcginfo = arg; + struct channel *ch = mpcginfo->ch; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", + __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); + + grp->outstanding_xid7--; + ch->xid_skb->data = ch->xid_skb_data; + skb_reset_tail_pointer(ch->xid_skb); + ch->xid_skb->len = 0; + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID7INITI: + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID7INITW: + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); + mpc_validate_xid(mpcginfo); + break; + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID7INITX: + if (grp->outstanding_xid7 == 0) { + if (grp->outstanding_xid7_p2 > 0) { + grp->outstanding_xid7 = + grp->outstanding_xid7_p2; + grp->outstanding_xid7_p2 = 0; + } else + fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); + + mpc_validate_xid(mpcginfo); + fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); + break; + } + mpc_validate_xid(mpcginfo); + break; + } + return; +} + +/* + * mpc_action helper of an MPC Group Station FSM action + * CTCM_PROTO_MPC only + */ +static int mpc_send_qllc_discontact(struct net_device *dev) +{ + struct sk_buff *skb; + struct qllc *qllcptr; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + + CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", + __func__, mpcg_state_names[grp->saved_state]); + + switch (grp->saved_state) { + /* + * establish conn callback function is + * preferred method to report failure + */ + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + case MPCG_STATE_XID2INITW: + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + if (grp->estconnfunc) { + grp->estconnfunc(grp->port_num, -1, 0); + grp->estconnfunc = NULL; + break; + } + fallthrough; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + grp->send_qllc_disc = 2; + + skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC); + if (skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): skb allocation error", + CTCM_FUNTAIL, dev->name); + priv->stats.rx_dropped++; + return -ENOMEM; + } + + qllcptr = skb_put(skb, sizeof(struct qllc)); + qllcptr->qllc_address = 0xcc; + qllcptr->qllc_commands = 0x03; + + if (skb_headroom(skb) < 4) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): skb_headroom error", + CTCM_FUNTAIL, dev->name); + dev_kfree_skb_any(skb); + return -ENOMEM; + } + + *((__u32 *)skb_push(skb, 4)) = + priv->channel[CTCM_READ]->pdu_seq; + priv->channel[CTCM_READ]->pdu_seq++; + CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", + __func__, priv->channel[CTCM_READ]->pdu_seq); + + /* receipt of CC03 resets anticipated sequence number on + receiving side */ + priv->channel[CTCM_READ]->pdu_seq = 0x00; + skb_reset_mac_header(skb); + skb->dev = dev; + skb->protocol = htons(ETH_P_SNAP); + skb->ip_summed = CHECKSUM_UNNECESSARY; + + CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); + + netif_rx(skb); + break; + default: + break; + + } + + return 0; +} +/* --- This is the END my friend --- */ + |