diff options
Diffstat (limited to 'drivers/s390/net/ctcm_fsms.c')
| -rw-r--r-- | drivers/s390/net/ctcm_fsms.c | 2291 |
1 files changed, 2291 insertions, 0 deletions
diff --git a/drivers/s390/net/ctcm_fsms.c b/drivers/s390/net/ctcm_fsms.c new file mode 100644 index 000000000..661d2a49b --- /dev/null +++ b/drivers/s390/net/ctcm_fsms.c @@ -0,0 +1,2291 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright IBM Corp. 2001, 2007 + * Authors: Fritz Elfert (felfert@millenux.com) + * Peter Tiedemann (ptiedem@de.ibm.com) + * MPC additions : + * Belinda Thompson (belindat@us.ibm.com) + * Andy Richter (richtera@us.ibm.com) + */ + +#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/bitops.h> + +#include <linux/signal.h> +#include <linux/string.h> + +#include <linux/ip.h> +#include <linux/if_arp.h> +#include <linux/tcp.h> +#include <linux/skbuff.h> +#include <linux/ctype.h> +#include <net/dst.h> + +#include <linux/io.h> +#include <asm/ccwdev.h> +#include <asm/ccwgroup.h> +#include <linux/uaccess.h> + +#include <asm/idals.h> + +#include "fsm.h" + +#include "ctcm_dbug.h" +#include "ctcm_main.h" +#include "ctcm_fsms.h" + +const char *dev_state_names[] = { + [DEV_STATE_STOPPED] = "Stopped", + [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX", + [DEV_STATE_STARTWAIT_RX] = "StartWait RX", + [DEV_STATE_STARTWAIT_TX] = "StartWait TX", + [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX", + [DEV_STATE_STOPWAIT_RX] = "StopWait RX", + [DEV_STATE_STOPWAIT_TX] = "StopWait TX", + [DEV_STATE_RUNNING] = "Running", +}; + +const char *dev_event_names[] = { + [DEV_EVENT_START] = "Start", + [DEV_EVENT_STOP] = "Stop", + [DEV_EVENT_RXUP] = "RX up", + [DEV_EVENT_TXUP] = "TX up", + [DEV_EVENT_RXDOWN] = "RX down", + [DEV_EVENT_TXDOWN] = "TX down", + [DEV_EVENT_RESTART] = "Restart", +}; + +const char *ctc_ch_event_names[] = { + [CTC_EVENT_IO_SUCCESS] = "ccw_device success", + [CTC_EVENT_IO_EBUSY] = "ccw_device busy", + [CTC_EVENT_IO_ENODEV] = "ccw_device enodev", + [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown", + [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY", + [CTC_EVENT_ATTN] = "Status ATTN", + [CTC_EVENT_BUSY] = "Status BUSY", + [CTC_EVENT_UC_RCRESET] = "Unit check remote reset", + [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset", + [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout", + [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity", + [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure", + [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity", + [CTC_EVENT_UC_ZERO] = "Unit check ZERO", + [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown", + [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown", + [CTC_EVENT_MC_FAIL] = "Machine check failure", + [CTC_EVENT_MC_GOOD] = "Machine check operational", + [CTC_EVENT_IRQ] = "IRQ normal", + [CTC_EVENT_FINSTAT] = "IRQ final", + [CTC_EVENT_TIMER] = "Timer", + [CTC_EVENT_START] = "Start", + [CTC_EVENT_STOP] = "Stop", + /* + * additional MPC events + */ + [CTC_EVENT_SEND_XID] = "XID Exchange", + [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer", +}; + +const char *ctc_ch_state_names[] = { + [CTC_STATE_IDLE] = "Idle", + [CTC_STATE_STOPPED] = "Stopped", + [CTC_STATE_STARTWAIT] = "StartWait", + [CTC_STATE_STARTRETRY] = "StartRetry", + [CTC_STATE_SETUPWAIT] = "SetupWait", + [CTC_STATE_RXINIT] = "RX init", + [CTC_STATE_TXINIT] = "TX init", + [CTC_STATE_RX] = "RX", + [CTC_STATE_TX] = "TX", + [CTC_STATE_RXIDLE] = "RX idle", + [CTC_STATE_TXIDLE] = "TX idle", + [CTC_STATE_RXERR] = "RX error", + [CTC_STATE_TXERR] = "TX error", + [CTC_STATE_TERM] = "Terminating", + [CTC_STATE_DTERM] = "Restarting", + [CTC_STATE_NOTOP] = "Not operational", + /* + * additional MPC states + */ + [CH_XID0_PENDING] = "Pending XID0 Start", + [CH_XID0_INPROGRESS] = "In XID0 Negotiations ", + [CH_XID7_PENDING] = "Pending XID7 P1 Start", + [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ", + [CH_XID7_PENDING2] = "Pending XID7 P2 Start ", + [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ", + [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ", +}; + +static void ctcm_action_nop(fsm_instance *fi, int event, void *arg); + +/* + * ----- static ctcm actions for channel statemachine ----- + * +*/ +static void chx_txdone(fsm_instance *fi, int event, void *arg); +static void chx_rx(fsm_instance *fi, int event, void *arg); +static void chx_rxidle(fsm_instance *fi, int event, void *arg); +static void chx_firstio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); + +/* + * ----- static ctcmpc actions for ctcmpc channel statemachine ----- + * +*/ +static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg); +static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg); +static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg); +/* shared : +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); +*/ +static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg); +static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *); +static void ctcmpc_chx_resend(fsm_instance *, int, void *); +static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg); + +/** + * Check return code of a preceding ccw_device call, halt_IO etc... + * + * ch : The channel, the error belongs to. + * Returns the error code (!= 0) to inspect. + */ +void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg) +{ + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s: %04x\n", + CTCM_FUNTAIL, ch->id, msg, rc); + switch (rc) { + case -EBUSY: + pr_info("%s: The communication peer is busy\n", + ch->id); + fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch); + break; + case -ENODEV: + pr_err("%s: The specified target device is not valid\n", + ch->id); + fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch); + break; + default: + pr_err("An I/O operation resulted in error %04x\n", + rc); + fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch); + } +} + +void ctcm_purge_skb_queue(struct sk_buff_head *q) +{ + struct sk_buff *skb; + + CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__); + + while ((skb = skb_dequeue(q))) { + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + } +} + +/** + * NOP action for statemachines + */ +static void ctcm_action_nop(fsm_instance *fi, int event, void *arg) +{ +} + +/* + * Actions for channel - statemachines. + */ + +/** + * Normal data has been send. Free the corresponding + * skb (it's in io_queue), reset dev->tbusy and + * revert to idle state. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_txdone(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct sk_buff *skb; + int first = 1; + int i; + unsigned long duration; + unsigned long done_stamp = jiffies; + + CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); + + duration = done_stamp - ch->prof.send_stamp; + if (duration > ch->prof.tx_time) + ch->prof.tx_time = duration; + + if (ch->irb->scsw.cmd.count != 0) + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): TX not complete, remaining %d bytes", + CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); + fsm_deltimer(&ch->timer); + while ((skb = skb_dequeue(&ch->io_queue))) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; + if (first) { + priv->stats.tx_bytes += 2; + first = 0; + } + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + } + spin_lock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[4]); + if (ch->collect_len > 0) { + int rc; + + if (ctcm_checkalloc_buffer(ch)) { + spin_unlock(&ch->collect_lock); + return; + } + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + if (ch->prof.maxmulti < (ch->collect_len + 2)) + ch->prof.maxmulti = ch->collect_len + 2; + if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) + ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); + *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; + i = 0; + while ((skb = skb_dequeue(&ch->collect_queue))) { + skb_copy_from_linear_data(skb, + skb_put(ch->trans_skb, skb->len), skb->len); + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + i++; + } + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + ch->ccw[1].count = ch->trans_skb->len; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + ch->prof.send_stamp = jiffies; + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + ch->prof.doios_multi++; + if (rc != 0) { + priv->stats.tx_dropped += i; + priv->stats.tx_errors += i; + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "chained TX"); + } + } else { + spin_unlock(&ch->collect_lock); + fsm_newstate(fi, CTC_STATE_TXIDLE); + } + ctcm_clear_busy_do(dev); +} + +/** + * Initial data is sent. + * Notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); + + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); +} + +/** + * Got normal data, check for sanity, queue it up, allocate new buffer + * trigger bottom half, and initiate next read. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_rx(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + int len = ch->max_bufsize - ch->irb->scsw.cmd.count; + struct sk_buff *skb = ch->trans_skb; + __u16 block_len = *((__u16 *)skb->data); + int check_len; + int rc; + + fsm_deltimer(&ch->timer); + if (len < 8) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got packet with length %d < 8\n", + CTCM_FUNTAIL, dev->name, len); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + if (len > ch->max_bufsize) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got packet with length %d > %d\n", + CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + + /* + * VM TCP seems to have a bug sending 2 trailing bytes of garbage. + */ + switch (ch->protocol) { + case CTCM_PROTO_S390: + case CTCM_PROTO_OS390: + check_len = block_len + 2; + break; + default: + check_len = block_len; + break; + } + if ((len < block_len) || (len > check_len)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s): got block length %d != rx length %d\n", + CTCM_FUNTAIL, dev->name, block_len, len); + if (do_debug) + ctcmpc_dump_skb(skb, 0); + + *((__u16 *)skb->data) = len; + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + goto again; + } + if (block_len > 2) { + *((__u16 *)skb->data) = block_len - 2; + ctcm_unpack_skb(ch, skb); + } + again: + skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(skb); + skb->len = 0; + if (ctcm_checkalloc_buffer(ch)) + return; + ch->ccw[1].count = ch->max_bufsize; + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, "normal RX"); +} + +/** + * Initialize connection by sending a __u16 of value 0. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_firstio(fsm_instance *fi, int event, void *arg) +{ + int rc; + struct channel *ch = arg; + int fsmstate = fsm_getstate(fi); + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s(%s) : %02x", + CTCM_FUNTAIL, ch->id, fsmstate); + + ch->sense_rc = 0; /* reset unit check report control */ + if (fsmstate == CTC_STATE_TXIDLE) + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): remote side issued READ?, init.\n", + CTCM_FUNTAIL, ch->id); + fsm_deltimer(&ch->timer); + if (ctcm_checkalloc_buffer(ch)) + return; + if ((fsmstate == CTC_STATE_SETUPWAIT) && + (ch->protocol == CTCM_PROTO_OS390)) { + /* OS/390 resp. z/OS */ + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, + CTC_EVENT_TIMER, ch); + chx_rxidle(fi, event, arg); + } else { + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); + } + return; + } + /* + * Don't setup a timer for receiving the initial RX frame + * if in compatibility mode, since VM TCP delays the initial + * frame until it has some data to send. + */ + if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) || + (ch->protocol != CTCM_PROTO_S390)) + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + + *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; + ch->ccw[1].count = 2; /* Transfer only length */ + + fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + if (rc != 0) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_SETUPWAIT); + ctcm_ccw_check_rc(ch, rc, "init IO"); + } + /* + * If in compatibility mode since we don't setup a timer, we + * also signal RX channel up immediately. This enables us + * to send packets early which in turn usually triggers some + * reply from VM TCP which brings up the RX channel to it's + * final state. + */ + if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) && + (ch->protocol == CTCM_PROTO_S390)) { + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); + } +} + +/** + * Got initial data, check it. If OK, + * notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void chx_rxidle(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + __u16 buflen; + int rc; + + fsm_deltimer(&ch->timer); + buflen = *((__u16 *)ch->trans_skb->data); + CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", + __func__, dev->name, buflen); + + if (buflen >= CTCM_INITIAL_BLOCKLEN) { + if (ctcm_checkalloc_buffer(ch)) + return; + ch->ccw[1].count = ch->max_bufsize; + fsm_newstate(fi, CTC_STATE_RXIDLE); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + if (rc != 0) { + fsm_newstate(fi, CTC_STATE_RXINIT); + ctcm_ccw_check_rc(ch, rc, "initial RX"); + } else + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); + } else { + CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", + __func__, dev->name, + buflen, CTCM_INITIAL_BLOCKLEN); + chx_firstio(fi, event, arg); + } +} + +/** + * Set channel into extended mode. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + int rc; + unsigned long saveflags = 0; + int timeout = CTCM_TIME_5_SEC; + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) { + timeout = 1500; + CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + } + fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch); + fsm_newstate(fi, CTC_STATE_SETUPWAIT); + CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2); + + if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is undeterministic in + * static view. => ignore sparse warnings here. */ + + rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0); + if (event == CTC_EVENT_TIMER) /* see above comments */ + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, CTC_STATE_STARTWAIT); + ctcm_ccw_check_rc(ch, rc, "set Mode"); + } else + ch->retry = 0; +} + +/** + * Setup channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + unsigned long saveflags; + int rc; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX"); + + if (ch->trans_skb != NULL) { + clear_normalized_cda(&ch->ccw[1]); + dev_kfree_skb(ch->trans_skb); + ch->trans_skb = NULL; + } + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + ch->ccw[1].cmd_code = CCW_CMD_READ; + ch->ccw[1].flags = CCW_FLAG_SLI; + ch->ccw[1].count = 0; + } else { + ch->ccw[1].cmd_code = CCW_CMD_WRITE; + ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[1].count = 0; + } + if (ctcm_checkalloc_buffer(ch)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s(%s): %s trans_skb alloc delayed " + "until first transfer", + CTCM_FUNTAIL, ch->id, + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? + "RX" : "TX"); + } + ch->ccw[0].cmd_code = CCW_CMD_PREPARE; + ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; + ch->ccw[0].count = 0; + ch->ccw[0].cda = 0; + ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ + ch->ccw[2].flags = CCW_FLAG_SLI; + ch->ccw[2].count = 0; + ch->ccw[2].cda = 0; + memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); + ch->ccw[4].cda = 0; + ch->ccw[4].flags &= ~CCW_FLAG_IDA; + + fsm_newstate(fi, CTC_STATE_STARTWAIT); + fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_halt(ch->cdev, 0); + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + if (rc != -EBUSY) + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); + } +} + +/** + * Shutdown a channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + unsigned long saveflags = 0; + int rc; + int oldstate; + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) + fsm_deltimer(&ch->sweep_timer); + + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + + if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is undeterministic in + * static view. => ignore sparse warnings here. */ + oldstate = fsm_getstate(fi); + fsm_newstate(fi, CTC_STATE_TERM); + rc = ccw_device_halt(ch->cdev, 0); + + if (event == CTC_EVENT_STOP) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + /* see remark above about conditional locking */ + + if (rc != 0 && rc != -EBUSY) { + fsm_deltimer(&ch->timer); + if (event != CTC_EVENT_STOP) { + fsm_newstate(fi, oldstate); + ctcm_ccw_check_rc(ch, rc, (char *)__func__); + } + } +} + +/** + * Cleanup helper for chx_fail and chx_stopped + * cleanup channels queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * state The next state (depending on caller). + * ch The channel to operate on. + */ +static void ctcm_chx_cleanup(fsm_instance *fi, int state, + struct channel *ch) +{ + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, + "%s(%s): %s[%d]\n", + CTCM_FUNTAIL, dev->name, ch->id, state); + + fsm_deltimer(&ch->timer); + if (IS_MPC(ch)) + fsm_deltimer(&ch->sweep_timer); + + fsm_newstate(fi, state); + if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { + clear_normalized_cda(&ch->ccw[1]); + dev_kfree_skb_any(ch->trans_skb); + ch->trans_skb = NULL; + } + + ch->th_seg = 0x00; + ch->th_seq_num = 0x00; + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + skb_queue_purge(&ch->io_queue); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + ctcm_purge_skb_queue(&ch->io_queue); + if (IS_MPC(ch)) + ctcm_purge_skb_queue(&ch->sweep_queue); + spin_lock(&ch->collect_lock); + ctcm_purge_skb_queue(&ch->collect_queue); + ch->collect_len = 0; + spin_unlock(&ch->collect_lock); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/** + * A channel has successfully been halted. + * Cleanup it's queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) +{ + ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); +} + +/** + * A stop command from device statemachine arrived and we are in + * not operational mode. Set state to stopped. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) +{ + fsm_newstate(fi, CTC_STATE_STOPPED); +} + +/** + * A machine check for no path, not operational status or gone device has + * happened. + * Cleanup queue and notify interface statemachine. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) +{ + ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); +} + +/** + * Handle error during setup of channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + /* + * Special case: Got UC_RCRESET on setmode. + * This means that remote side isn't setup. In this case + * simply retry after some 10 secs... + */ + if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && + ((event == CTC_EVENT_UC_RCRESET) || + (event == CTC_EVENT_UC_RSRESET))) { + fsm_newstate(fi, CTC_STATE_STARTRETRY); + fsm_deltimer(&ch->timer); + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + if (!IS_MPC(ch) && + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) { + int rc = ccw_device_halt(ch->cdev, 0); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, + "HaltIO in chx_setuperr"); + } + return; + } + + CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, + "%s(%s) : %s error during %s channel setup state=%s\n", + CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], + (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX", + fsm_getstate_str(fi)); + + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/** + * Restart a channel after an error. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + unsigned long saveflags = 0; + int oldstate; + int rc; + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s: %s[%d] of %s\n", + CTCM_FUNTAIL, ch->id, event, dev->name); + + fsm_deltimer(&ch->timer); + + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + oldstate = fsm_getstate(fi); + fsm_newstate(fi, CTC_STATE_STARTWAIT); + if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is a known problem for + * sparse because its undeterministic in static view. + * Warnings should be ignored here. */ + rc = ccw_device_halt(ch->cdev, 0); + if (event == CTC_EVENT_TIMER) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + if (rc != -EBUSY) { + fsm_deltimer(&ch->timer); + fsm_newstate(fi, oldstate); + } + ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); + } +} + +/** + * Handle error during RX initial handshake (exchange of + * 0-length block header) + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + if (event == CTC_EVENT_TIMER) { + if (!IS_MPCDEV(dev)) + /* TODO : check if MPC deletes timer somewhere */ + fsm_deltimer(&ch->timer); + if (ch->retry++ < 3) + ctcm_chx_restart(fi, event, arg); + else { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } + } else { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, + ctc_ch_event_names[event], fsm_getstate_str(fi)); + + dev_warn(&dev->dev, + "Initialization failed with RX/TX init handshake " + "error %s\n", ctc_ch_event_names[event]); + } +} + +/** + * Notify device statemachine if we gave up initialization + * of RX channel. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): RX %s busy, init. fail", + CTCM_FUNTAIL, dev->name, ch->id); + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); +} + +/** + * Handle RX Unit check remote reset (remote disconnected) + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct channel *ch2; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, + "%s: %s: remote disconnect - re-init ...", + CTCM_FUNTAIL, dev->name); + fsm_deltimer(&ch->timer); + /* + * Notify device statemachine + */ + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + + fsm_newstate(fi, CTC_STATE_DTERM); + ch2 = priv->channel[CTCM_WRITE]; + fsm_newstate(ch2->fsm, CTC_STATE_DTERM); + + ccw_device_halt(ch->cdev, 0); + ccw_device_halt(ch2->cdev, 0); +} + +/** + * Handle error during TX channel initialization. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + + if (event == CTC_EVENT_TIMER) { + fsm_deltimer(&ch->timer); + if (ch->retry++ < 3) + ctcm_chx_restart(fi, event, arg); + else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } + } else { + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, + ctc_ch_event_names[event], fsm_getstate_str(fi)); + + dev_warn(&dev->dev, + "Initialization failed with RX/TX init handshake " + "error %s\n", ctc_ch_event_names[event]); + } +} + +/** + * Handle TX timeout by retrying operation. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct sk_buff *skb; + + CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ch, ch->id); + + fsm_deltimer(&ch->timer); + if (ch->retry++ > 3) { + struct mpc_group *gptr = priv->mpcg; + CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, + "%s: %s: retries exceeded", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + /* call restart if not MPC or if MPC and mpcg fsm is ready. + use gptr as mpc indicator */ + if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) + ctcm_chx_restart(fi, event, arg); + goto done; + } + + CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, + "%s : %s: retry %d", + CTCM_FUNTAIL, ch->id, ch->retry); + skb = skb_peek(&ch->io_queue); + if (skb) { + int rc = 0; + unsigned long saveflags = 0; + clear_normalized_cda(&ch->ccw[4]); + ch->ccw[4].count = skb->len; + if (set_normalized_cda(&ch->ccw[4], skb->data)) { + CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, + "%s: %s: IDAL alloc failed", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + ctcm_chx_restart(fi, event, arg); + goto done; + } + fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); + if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + /* Such conditional locking is a known problem for + * sparse because its undeterministic in static view. + * Warnings should be ignored here. */ + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[3], + sizeof(struct ccw1) * 3); + + rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 0xff, 0); + if (event == CTC_EVENT_TIMER) + spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), + saveflags); + if (rc != 0) { + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry"); + ctcm_purge_skb_queue(&ch->io_queue); + } + } +done: + return; +} + +/** + * Handle fatal errors during an I/O command. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + int rd = CHANNEL_DIRECTION(ch->flags); + + fsm_deltimer(&ch->timer); + CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, + "%s: %s: %s unrecoverable channel error", + CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX"); + + if (IS_MPC(ch)) { + priv->stats.tx_dropped++; + priv->stats.tx_errors++; + } + if (rd == CTCM_READ) { + fsm_newstate(fi, CTC_STATE_RXERR); + fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); + } else { + fsm_newstate(fi, CTC_STATE_TXERR); + fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); + } +} + +/* + * The ctcm statemachine for a channel. + */ +const fsm_node ch_fsm[] = { + { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, + { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + + { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, + + { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, + { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, + { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio }, + { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, + { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx }, + + { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, + { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone }, + { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, +}; + +int ch_fsm_len = ARRAY_SIZE(ch_fsm); + +/* + * MPC actions for mpc channel statemachine + * handling of MPC protocol requires extra + * statemachine and actions which are prefixed ctcmpc_ . + * The ctc_ch_states and ctc_ch_state_names, + * ctc_ch_events and ctc_ch_event_names share the ctcm definitions + * which are expanded by some elements. + */ + +/* + * Actions for mpc channel statemachine. + */ + +/** + * Normal data has been send. Free the corresponding + * skb (it's in io_queue), reset dev->tbusy and + * revert to idle state. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_txdone(fsm_instance *fi, 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; + struct sk_buff *skb; + int first = 1; + int i; + __u32 data_space; + unsigned long duration; + struct sk_buff *peekskb; + int rc; + struct th_header *header; + struct pdu *p_header; + unsigned long done_stamp = jiffies; + + CTCM_PR_DEBUG("Enter %s: %s cp:%i\n", + __func__, dev->name, smp_processor_id()); + + duration = done_stamp - ch->prof.send_stamp; + if (duration > ch->prof.tx_time) + ch->prof.tx_time = duration; + + if (ch->irb->scsw.cmd.count != 0) + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, + "%s(%s): TX not complete, remaining %d bytes", + CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); + fsm_deltimer(&ch->timer); + while ((skb = skb_dequeue(&ch->io_queue))) { + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; + if (first) { + priv->stats.tx_bytes += 2; + first = 0; + } + refcount_dec(&skb->users); + dev_kfree_skb_irq(skb); + } + spin_lock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[4]); + if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) { + spin_unlock(&ch->collect_lock); + fsm_newstate(fi, CTC_STATE_TXIDLE); + goto done; + } + + if (ctcm_checkalloc_buffer(ch)) { + spin_unlock(&ch->collect_lock); + goto done; + } + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH)) + ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH; + if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) + ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); + i = 0; + p_header = NULL; + data_space = grp->group_max_buflen - TH_HEADER_LENGTH; + + CTCM_PR_DBGDATA("%s: building trans_skb from collect_q" + " data_space:%04x\n", + __func__, data_space); + + while ((skb = skb_dequeue(&ch->collect_queue))) { + skb_put_data(ch->trans_skb, skb->data, skb->len); + p_header = (struct pdu *) + (skb_tail_pointer(ch->trans_skb) - skb->len); + p_header->pdu_flag = 0x00; + if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) + p_header->pdu_flag |= 0x60; + else + p_header->pdu_flag |= 0x20; + + CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", + __func__, ch->trans_skb->len); + CTCM_PR_DBGDATA("%s: pdu header and data for up" + " to 32 bytes sent to vtam\n", __func__); + CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32)); + + ch->collect_len -= skb->len; + data_space -= skb->len; + priv->stats.tx_packets++; + priv->stats.tx_bytes += skb->len; + refcount_dec(&skb->users); + dev_kfree_skb_any(skb); + peekskb = skb_peek(&ch->collect_queue); + if (peekskb->len > data_space) + break; + i++; + } + /* p_header points to the last one we handled */ + if (p_header) + p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/ + header = kzalloc(TH_HEADER_LENGTH, gfp_type()); + if (!header) { + spin_unlock(&ch->collect_lock); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + header->th_ch_flag = TH_HAS_PDU; /* Normal data */ + ch->th_seq_num++; + header->th_seq_num = ch->th_seq_num; + + CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , + __func__, ch->th_seq_num); + + memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header, + TH_HEADER_LENGTH); /* put the TH on the packet */ + + kfree(header); + + CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", + __func__, ch->trans_skb->len); + CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " + "data to vtam from collect_q\n", __func__); + CTCM_D3_DUMP((char *)ch->trans_skb->data, + min_t(int, ch->trans_skb->len, 50)); + + spin_unlock(&ch->collect_lock); + clear_normalized_cda(&ch->ccw[1]); + + CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", + (void *)(unsigned long)ch->ccw[1].cda, + ch->trans_skb->data); + ch->ccw[1].count = ch->max_bufsize; + + if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { + dev_kfree_skb_any(ch->trans_skb); + ch->trans_skb = NULL; + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, + "%s: %s: IDAL alloc failed", + CTCM_FUNTAIL, ch->id); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + return; + } + + CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", + (void *)(unsigned long)ch->ccw[1].cda, + ch->trans_skb->data); + + ch->ccw[1].count = ch->trans_skb->len; + fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); + ch->prof.send_stamp = jiffies; + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + ch->prof.doios_multi++; + if (rc != 0) { + priv->stats.tx_dropped += i; + priv->stats.tx_errors += i; + fsm_deltimer(&ch->timer); + ctcm_ccw_check_rc(ch, rc, "chained TX"); + } +done: + ctcm_clear_busy(dev); + return; +} + +/** + * Got normal data, check for sanity, queue it up, allocate new buffer + * trigger bottom half, and initiate next read. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_rx(fsm_instance *fi, 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; + struct sk_buff *skb = ch->trans_skb; + struct sk_buff *new_skb; + unsigned long saveflags = 0; /* avoids compiler warning */ + int len = ch->max_bufsize - ch->irb->scsw.cmd.count; + + CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n", + CTCM_FUNTAIL, dev->name, smp_processor_id(), + ch->id, ch->max_bufsize, len); + fsm_deltimer(&ch->timer); + + if (skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): TRANS_SKB = NULL", + CTCM_FUNTAIL, dev->name); + goto again; + } + + if (len < TH_HEADER_LENGTH) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): packet length %d to short", + CTCM_FUNTAIL, dev->name, len); + priv->stats.rx_dropped++; + priv->stats.rx_length_errors++; + } else { + /* must have valid th header or game over */ + __u32 block_len = len; + len = TH_HEADER_LENGTH + XID2_LENGTH + 4; + new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC); + + if (new_skb == NULL) { + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%d): skb allocation failed", + CTCM_FUNTAIL, dev->name); + fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); + goto again; + } + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_RESET: + case MPCG_STATE_INOP: + dev_kfree_skb_any(new_skb); + break; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + skb_put_data(new_skb, skb->data, block_len); + skb_queue_tail(&ch->io_queue, new_skb); + tasklet_schedule(&ch->ch_tasklet); + break; + default: + skb_put_data(new_skb, skb->data, len); + skb_queue_tail(&ch->io_queue, new_skb); + tasklet_hi_schedule(&ch->ch_tasklet); + break; + } + } + +again: + switch (fsm_getstate(grp->fsm)) { + int rc, dolock; + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + if (ctcm_checkalloc_buffer(ch)) + break; + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = ch->max_bufsize; + if (do_debug_ccw) + ctcmpc_dumpit((char *)&ch->ccw[0], + sizeof(struct ccw1) * 3); + dolock = !in_irq(); + if (dolock) + spin_lock_irqsave( + get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + if (dolock) /* see remark about conditional locking */ + spin_unlock_irqrestore( + get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) + ctcm_ccw_check_rc(ch, rc, "normal RX"); + default: + break; + } + + CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n", + __func__, dev->name, ch, ch->id); + +} + +/** + * Initialize connection by sending a __u16 of value 0. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg) +{ + struct channel *ch = arg; + struct net_device *dev = ch->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *gptr = priv->mpcg; + + CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n", + __func__, ch->id, ch); + + CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, + "%s: %s: chstate:%i, grpstate:%i, prot:%i\n", + CTCM_FUNTAIL, ch->id, fsm_getstate(fi), + fsm_getstate(gptr->fsm), ch->protocol); + + if (fsm_getstate(fi) == CTC_STATE_TXIDLE) + MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? "); + + fsm_deltimer(&ch->timer); + if (ctcm_checkalloc_buffer(ch)) + goto done; + + switch (fsm_getstate(fi)) { + case CTC_STATE_STARTRETRY: + case CTC_STATE_SETUPWAIT: + if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { + ctcmpc_chx_rxidle(fi, event, arg); + } else { + fsm_newstate(fi, CTC_STATE_TXIDLE); + fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); + } + goto done; + default: + break; + } + + fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) + ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); + +done: + CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n", + __func__, ch->id, ch); + return; +} + +/** + * Got initial data, check it. If OK, + * notify device statemachine that we are up and + * running. + * + * fi An instance of a channel statemachine. + * event The event, just happened. + * arg Generic pointer, casted from channel * upon call. + */ +void ctcmpc_chx_rxidle(fsm_instance *fi, 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; + int rc; + unsigned long saveflags = 0; /* avoids compiler warning */ + + fsm_deltimer(&ch->timer); + CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n", + __func__, ch->id, dev->name, smp_processor_id(), + fsm_getstate(fi), fsm_getstate(grp->fsm)); + + fsm_newstate(fi, CTC_STATE_RXIDLE); + /* XID processing complete */ + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_FLOWC: + case MPCG_STATE_READY: + if (ctcm_checkalloc_buffer(ch)) + goto done; + ch->trans_skb->data = ch->trans_skb_data; + skb_reset_tail_pointer(ch->trans_skb); + ch->trans_skb->len = 0; + ch->ccw[1].count = ch->max_bufsize; + CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); + if (event == CTC_EVENT_START) + /* see remark about conditional locking */ + spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); + rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); + if (event == CTC_EVENT_START) + spin_unlock_irqrestore( + get_ccwdev_lock(ch->cdev), saveflags); + if (rc != 0) { + fsm_newstate(fi, CTC_STATE_RXINIT); + ctcm_ccw_check_rc(ch, rc, "initial RX"); + goto done; + } + break; + default: + break; + } + + fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); +done: + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_attn(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("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n", + __func__, dev->name, ch->id, ch, smp_processor_id(), + fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID2INITW: + /* ok..start yside xid exchanges */ + if (!ch->in_mpcgroup) + break; + if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) { + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, + MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + + } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) + /* attn rcvd before xid0 processed via bh */ + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case MPCG_STATE_XID2INITX: + case MPCG_STATE_XID0IOWAIT: + case MPCG_STATE_XID0IOWAIX: + /* attn rcvd before xid0 processed on ch + but mid-xid0 processing for group */ + if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + switch (fsm_getstate(ch->fsm)) { + case CH_XID7_PENDING: + fsm_newstate(ch->fsm, CH_XID7_PENDING1); + break; + case CH_XID7_PENDING2: + fsm_newstate(ch->fsm, CH_XID7_PENDING3); + break; + } + fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); + break; + } + + return; +} + +/* + * ctcmpc channel FSM action + * called from one point in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_attnbusy(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("%s(%s): %s\n ChState:%s GrpState:%s\n", + __func__, dev->name, ch->id, + fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); + + fsm_deltimer(&ch->timer); + + switch (fsm_getstate(grp->fsm)) { + case MPCG_STATE_XID0IOWAIT: + /* vtam wants to be primary.start yside xid exchanges*/ + /* only receive one attn-busy at a time so must not */ + /* change state each time */ + grp->changed_side = 1; + fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); + break; + case MPCG_STATE_XID2INITW: + if (grp->changed_side == 1) { + grp->changed_side = 2; + break; + } + /* process began via call to establish_conn */ + /* so must report failure instead of reverting */ + /* back to ready-for-xid passive state */ + if (grp->estconnfunc) + goto done; + /* this attnbusy is NOT the result of xside xid */ + /* collisions so yside must have been triggered */ + /* by an ATTN that was not intended to start XID */ + /* processing. Revert back to ready-for-xid and */ + /* wait for ATTN interrupt to signal xid start */ + if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) { + fsm_newstate(ch->fsm, CH_XID0_PENDING) ; + fsm_deltimer(&grp->timer); + goto done; + } + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + case MPCG_STATE_XID2INITX: + /* XID2 was received before ATTN Busy for second + channel.Send yside xid for second channel. + */ + if (grp->changed_side == 1) { + grp->changed_side = 2; + break; + } + fallthrough; + case MPCG_STATE_XID0IOWAIX: + case MPCG_STATE_XID7INITW: + case MPCG_STATE_XID7INITX: + case MPCG_STATE_XID7INITI: + case MPCG_STATE_XID7INITZ: + default: + /* multiple attn-busy indicates too out-of-sync */ + /* and they are certainly not being received as part */ + /* of valid mpc group negotiations.. */ + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } + + if (grp->changed_side == 1) { + fsm_deltimer(&grp->timer); + fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, + MPCG_EVENT_TIMER, dev); + } + if (ch->in_mpcgroup) + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + else + CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, + "%s(%s): channel %s not added to group", + CTCM_FUNTAIL, dev->name, ch->id); + +done: + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_resend(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; + + fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); + return; +} + +/* + * ctcmpc channel FSM action + * called from several points in ctcmpc_ch_fsm + * ctcmpc only + */ +static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg) +{ + struct channel *ach = arg; + struct net_device *dev = ach->netdev; + struct ctcm_priv *priv = dev->ml_priv; + struct mpc_group *grp = priv->mpcg; + struct channel *wch = priv->channel[CTCM_WRITE]; + struct channel *rch = priv->channel[CTCM_READ]; + struct sk_buff *skb; + struct th_sweep *header; + int rc = 0; + unsigned long saveflags = 0; + + CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n", + __func__, smp_processor_id(), ach, ach->id); + + if (grp->in_sweep == 0) + goto done; + + CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" , + __func__, wch->th_seq_num); + CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" , + __func__, rch->th_seq_num); + + if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) { + /* give the previous IO time to complete */ + fsm_addtimer(&wch->sweep_timer, + 200, CTC_EVENT_RSWEEP_TIMER, wch); + goto done; + } + + skb = skb_dequeue(&wch->sweep_queue); + if (!skb) + goto done; + + if (set_normalized_cda(&wch->ccw[4], skb->data)) { + grp->in_sweep = 0; + ctcm_clear_busy_do(dev); + dev_kfree_skb_any(skb); + fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); + goto done; + } else { + refcount_inc(&skb->users); + skb_queue_tail(&wch->io_queue, skb); + } + + /* send out the sweep */ + wch->ccw[4].count = skb->len; + + header = (struct th_sweep *)skb->data; + switch (header->th.th_ch_flag) { + case TH_SWEEP_REQ: + grp->sweep_req_pend_num--; + break; + case TH_SWEEP_RESP: + grp->sweep_rsp_pend_num--; + break; + } + + header->sw.th_last_seq = wch->th_seq_num; + + CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3); + CTCM_PR_DBGDATA("%s: sweep packet\n", __func__); + CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH); + + fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch); + fsm_newstate(wch->fsm, CTC_STATE_TX); + + spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags); + wch->prof.send_stamp = jiffies; + rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0); + spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags); + + if ((grp->sweep_req_pend_num == 0) && + (grp->sweep_rsp_pend_num == 0)) { + grp->in_sweep = 0; + rch->th_seq_num = 0x00; + wch->th_seq_num = 0x00; + ctcm_clear_busy_do(dev); + } + + CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" , + __func__, wch->th_seq_num, rch->th_seq_num); + + if (rc != 0) + ctcm_ccw_check_rc(wch, rc, "send sweep"); + +done: + return; +} + + +/* + * The ctcmpc statemachine for a channel. + */ + +const fsm_node ctcmpc_ch_fsm[] = { + { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, + { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + + { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, + { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, + { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop }, + { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, + { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, + { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, + { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio }, + { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + + { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop }, + { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + + { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy }, + { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn }, + { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop }, + { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, + { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, + { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend }, + { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, + + { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, + { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + + { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + + { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, + { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, + { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, + { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + + { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, + { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone }, + { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, + { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, + { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, + + { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, + { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, + { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, + { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, +}; + +int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm); + +/* + * Actions for interface - statemachine. + */ + +/** + * Startup channels by sending CTC_EVENT_START to each channel. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_start(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + int direction; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + fsm_deltimer(&priv->restart_timer); + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + if (IS_MPC(priv)) + priv->mpcg->channels_terminating = 0; + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + fsm_event(ch->fsm, CTC_EVENT_START, ch); + } +} + +/** + * Shutdown channels by sending CTC_EVENT_STOP to each channel. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_stop(fsm_instance *fi, int event, void *arg) +{ + int direction; + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { + struct channel *ch = priv->channel[direction]; + fsm_event(ch->fsm, CTC_EVENT_STOP, ch); + ch->th_seq_num = 0x00; + CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n", + __func__, ch->th_seq_num); + } + if (IS_MPC(priv)) + fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); +} + +static void dev_action_restart(fsm_instance *fi, int event, void *arg) +{ + int restart_timer; + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(TRACE, dev, ""); + + if (IS_MPC(priv)) { + restart_timer = CTCM_TIME_1_SEC; + } else { + restart_timer = CTCM_TIME_5_SEC; + } + dev_info(&dev->dev, "Restarting device\n"); + + dev_action_stop(fi, event, arg); + fsm_event(priv->fsm, DEV_EVENT_STOP, dev); + if (IS_MPC(priv)) + fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); + + /* going back into start sequence too quickly can */ + /* result in the other side becoming unreachable due */ + /* to sense reported when IO is aborted */ + fsm_addtimer(&priv->restart_timer, restart_timer, + DEV_EVENT_START, dev); +} + +/** + * Called from channel statemachine + * when a channel is up and running. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_chup(fsm_instance *fi, int event, void *arg) +{ + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + int dev_stat = fsm_getstate(fi); + + CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, + "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL, + dev->name, dev->ml_priv, dev_stat, event); + + switch (fsm_getstate(fi)) { + case DEV_STATE_STARTWAIT_RXTX: + if (event == DEV_EVENT_RXUP) + fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); + else + fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); + break; + case DEV_STATE_STARTWAIT_RX: + if (event == DEV_EVENT_RXUP) { + fsm_newstate(fi, DEV_STATE_RUNNING); + dev_info(&dev->dev, + "Connected with remote side\n"); + ctcm_clear_busy(dev); + } + break; + case DEV_STATE_STARTWAIT_TX: + if (event == DEV_EVENT_TXUP) { + fsm_newstate(fi, DEV_STATE_RUNNING); + dev_info(&dev->dev, + "Connected with remote side\n"); + ctcm_clear_busy(dev); + } + break; + case DEV_STATE_STOPWAIT_TX: + if (event == DEV_EVENT_RXUP) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + break; + case DEV_STATE_STOPWAIT_RX: + if (event == DEV_EVENT_TXUP) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); + break; + } + + if (IS_MPC(priv)) { + if (event == DEV_EVENT_RXUP) + mpc_channel_action(priv->channel[CTCM_READ], + CTCM_READ, MPC_CHANNEL_ADD); + else + mpc_channel_action(priv->channel[CTCM_WRITE], + CTCM_WRITE, MPC_CHANNEL_ADD); + } +} + +/** + * Called from device statemachine + * when a channel has been shutdown. + * + * fi An instance of an interface statemachine. + * event The event, just happened. + * arg Generic pointer, casted from struct net_device * upon call. + */ +static void dev_action_chdown(fsm_instance *fi, int event, void *arg) +{ + + struct net_device *dev = arg; + struct ctcm_priv *priv = dev->ml_priv; + + CTCMY_DBF_DEV_NAME(SETUP, dev, ""); + + switch (fsm_getstate(fi)) { + case DEV_STATE_RUNNING: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); + else + fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); + break; + case DEV_STATE_STARTWAIT_RX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + break; + case DEV_STATE_STARTWAIT_TX: + if (event == DEV_EVENT_RXDOWN) + fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); + break; + case DEV_STATE_STOPWAIT_RXTX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); + else + fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); + break; + case DEV_STATE_STOPWAIT_RX: + if (event == DEV_EVENT_RXDOWN) + fsm_newstate(fi, DEV_STATE_STOPPED); + break; + case DEV_STATE_STOPWAIT_TX: + if (event == DEV_EVENT_TXDOWN) + fsm_newstate(fi, DEV_STATE_STOPPED); + break; + } + if (IS_MPC(priv)) { + if (event == DEV_EVENT_RXDOWN) + mpc_channel_action(priv->channel[CTCM_READ], + CTCM_READ, MPC_CHANNEL_REMOVE); + else + mpc_channel_action(priv->channel[CTCM_WRITE], + CTCM_WRITE, MPC_CHANNEL_REMOVE); + } +} + +const fsm_node dev_fsm[] = { + { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, + { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, + { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, + { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, + { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop }, + { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop }, + { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, +}; + +int dev_fsm_len = ARRAY_SIZE(dev_fsm); + +/* --- This is the END my friend --- */ + |