+++ /dev/null
-/*
- * CTC / ESCON network driver
- *
- * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
- * Fixes by : Jochen Röhrig (roehrig@de.ibm.com)
- * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- Peter Tiedemann (ptiedem@de.ibm.com)
- * Driver Model stuff by : Cornelia Huck <cornelia.huck@de.ibm.com>
- *
- * Documentation used:
- * - Principles of Operation (IBM doc#: SA22-7201-06)
- * - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02)
- * - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535)
- * - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00)
- * - ESCON I/O Interface (IBM doc#: SA22-7202-029
- *
- * and the source of the original CTC driver by:
- * Dieter Wellerdiek (wel@de.ibm.com)
- * Martin Schwidefsky (schwidefsky@de.ibm.com)
- * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
- * Jochen Röhrig (roehrig@de.ibm.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-#undef DEBUG
-#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 <asm/io.h>
-#include <asm/ccwdev.h>
-#include <asm/ccwgroup.h>
-#include <asm/uaccess.h>
-
-#include <asm/idals.h>
-
-#include "fsm.h"
-#include "cu3088.h"
-
-#include "ctcdbug.h"
-#include "ctcmain.h"
-
-MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
-MODULE_DESCRIPTION("Linux for S/390 CTC/Escon Driver");
-MODULE_LICENSE("GPL");
-/**
- * States of the interface statemachine.
- */
-enum dev_states {
- DEV_STATE_STOPPED,
- DEV_STATE_STARTWAIT_RXTX,
- DEV_STATE_STARTWAIT_RX,
- DEV_STATE_STARTWAIT_TX,
- DEV_STATE_STOPWAIT_RXTX,
- DEV_STATE_STOPWAIT_RX,
- DEV_STATE_STOPWAIT_TX,
- DEV_STATE_RUNNING,
- /**
- * MUST be always the last element!!
- */
- CTC_NR_DEV_STATES
-};
-
-static const char *dev_state_names[] = {
- "Stopped",
- "StartWait RXTX",
- "StartWait RX",
- "StartWait TX",
- "StopWait RXTX",
- "StopWait RX",
- "StopWait TX",
- "Running",
-};
-
-/**
- * Events of the interface statemachine.
- */
-enum dev_events {
- DEV_EVENT_START,
- DEV_EVENT_STOP,
- DEV_EVENT_RXUP,
- DEV_EVENT_TXUP,
- DEV_EVENT_RXDOWN,
- DEV_EVENT_TXDOWN,
- DEV_EVENT_RESTART,
- /**
- * MUST be always the last element!!
- */
- CTC_NR_DEV_EVENTS
-};
-
-static const char *dev_event_names[] = {
- "Start",
- "Stop",
- "RX up",
- "TX up",
- "RX down",
- "TX down",
- "Restart",
-};
-
-/**
- * Events of the channel statemachine
- */
-enum ch_events {
- /**
- * Events, representing return code of
- * I/O operations (ccw_device_start, ccw_device_halt et al.)
- */
- CH_EVENT_IO_SUCCESS,
- CH_EVENT_IO_EBUSY,
- CH_EVENT_IO_ENODEV,
- CH_EVENT_IO_EIO,
- CH_EVENT_IO_UNKNOWN,
-
- CH_EVENT_ATTNBUSY,
- CH_EVENT_ATTN,
- CH_EVENT_BUSY,
-
- /**
- * Events, representing unit-check
- */
- CH_EVENT_UC_RCRESET,
- CH_EVENT_UC_RSRESET,
- CH_EVENT_UC_TXTIMEOUT,
- CH_EVENT_UC_TXPARITY,
- CH_EVENT_UC_HWFAIL,
- CH_EVENT_UC_RXPARITY,
- CH_EVENT_UC_ZERO,
- CH_EVENT_UC_UNKNOWN,
-
- /**
- * Events, representing subchannel-check
- */
- CH_EVENT_SC_UNKNOWN,
-
- /**
- * Events, representing machine checks
- */
- CH_EVENT_MC_FAIL,
- CH_EVENT_MC_GOOD,
-
- /**
- * Event, representing normal IRQ
- */
- CH_EVENT_IRQ,
- CH_EVENT_FINSTAT,
-
- /**
- * Event, representing timer expiry.
- */
- CH_EVENT_TIMER,
-
- /**
- * Events, representing commands from upper levels.
- */
- CH_EVENT_START,
- CH_EVENT_STOP,
-
- /**
- * MUST be always the last element!!
- */
- NR_CH_EVENTS,
-};
-
-/**
- * States of the channel statemachine.
- */
-enum ch_states {
- /**
- * Channel not assigned to any device,
- * initial state, direction invalid
- */
- CH_STATE_IDLE,
-
- /**
- * Channel assigned but not operating
- */
- CH_STATE_STOPPED,
- CH_STATE_STARTWAIT,
- CH_STATE_STARTRETRY,
- CH_STATE_SETUPWAIT,
- CH_STATE_RXINIT,
- CH_STATE_TXINIT,
- CH_STATE_RX,
- CH_STATE_TX,
- CH_STATE_RXIDLE,
- CH_STATE_TXIDLE,
- CH_STATE_RXERR,
- CH_STATE_TXERR,
- CH_STATE_TERM,
- CH_STATE_DTERM,
- CH_STATE_NOTOP,
-
- /**
- * MUST be always the last element!!
- */
- NR_CH_STATES,
-};
-
-static int loglevel = CTC_LOGLEVEL_DEFAULT;
-
-/**
- * Linked list of all detected channels.
- */
-static struct channel *channels = NULL;
-
-/**
- * Print Banner.
- */
-static void
-print_banner(void)
-{
- static int printed = 0;
-
- if (printed)
- return;
-
- printk(KERN_INFO "CTC driver initialized\n");
- printed = 1;
-}
-
-/**
- * Return type of a detected device.
- */
-static enum channel_types
-get_channel_type(struct ccw_device_id *id)
-{
- enum channel_types type = (enum channel_types) id->driver_info;
-
- if (type == channel_type_ficon)
- type = channel_type_escon;
-
- return type;
-}
-
-static const char *ch_event_names[] = {
- "ccw_device success",
- "ccw_device busy",
- "ccw_device enodev",
- "ccw_device ioerr",
- "ccw_device unknown",
-
- "Status ATTN & BUSY",
- "Status ATTN",
- "Status BUSY",
-
- "Unit check remote reset",
- "Unit check remote system reset",
- "Unit check TX timeout",
- "Unit check TX parity",
- "Unit check Hardware failure",
- "Unit check RX parity",
- "Unit check ZERO",
- "Unit check Unknown",
-
- "SubChannel check Unknown",
-
- "Machine check failure",
- "Machine check operational",
-
- "IRQ normal",
- "IRQ final",
-
- "Timer",
-
- "Start",
- "Stop",
-};
-
-static const char *ch_state_names[] = {
- "Idle",
- "Stopped",
- "StartWait",
- "StartRetry",
- "SetupWait",
- "RX init",
- "TX init",
- "RX",
- "TX",
- "RX idle",
- "TX idle",
- "RX error",
- "TX error",
- "Terminating",
- "Restarting",
- "Not operational",
-};
-
-#ifdef DEBUG
-/**
- * Dump header and first 16 bytes of an sk_buff for debugging purposes.
- *
- * @param skb The sk_buff to dump.
- * @param offset Offset relative to skb-data, where to start the dump.
- */
-static void
-ctc_dump_skb(struct sk_buff *skb, int offset)
-{
- unsigned char *p = skb->data;
- __u16 bl;
- struct ll_header *header;
- int i;
-
- if (!(loglevel & CTC_LOGLEVEL_DEBUG))
- return;
- p += offset;
- bl = *((__u16 *) p);
- p += 2;
- header = (struct ll_header *) p;
- p -= 2;
-
- printk(KERN_DEBUG "dump:\n");
- printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl);
-
- printk(KERN_DEBUG "h->length=%d %04x\n", header->length,
- header->length);
- printk(KERN_DEBUG "h->type=%04x\n", header->type);
- printk(KERN_DEBUG "h->unused=%04x\n", header->unused);
- if (bl > 16)
- bl = 16;
- printk(KERN_DEBUG "data: ");
- for (i = 0; i < bl; i++)
- printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>");
- printk("\n");
-}
-#else
-static inline void
-ctc_dump_skb(struct sk_buff *skb, int offset)
-{
-}
-#endif
-
-/**
- * Unpack a just received skb and hand it over to
- * upper layers.
- *
- * @param ch The channel where this skb has been received.
- * @param pskb The received skb.
- */
-static void
-ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
-{
- struct net_device *dev = ch->netdev;
- struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
- __u16 len = *((__u16 *) pskb->data);
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- skb_put(pskb, 2 + LL_HEADER_LENGTH);
- skb_pull(pskb, 2);
- pskb->dev = dev;
- pskb->ip_summed = CHECKSUM_UNNECESSARY;
- while (len > 0) {
- struct sk_buff *skb;
- struct ll_header *header = (struct ll_header *) pskb->data;
-
- skb_pull(pskb, LL_HEADER_LENGTH);
- if ((ch->protocol == CTC_PROTO_S390) &&
- (header->type != ETH_P_IP)) {
-
-#ifndef DEBUG
- if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
-#endif
- /**
- * Check packet type only if we stick strictly
- * to S/390's protocol of OS390. This only
- * supports IP. Otherwise allow any packet
- * type.
- */
- ctc_pr_warn(
- "%s Illegal packet type 0x%04x received, dropping\n",
- dev->name, header->type);
- ch->logflags |= LOG_FLAG_ILLEGALPKT;
-#ifndef DEBUG
- }
-#endif
-#ifdef DEBUG
- ctc_dump_skb(pskb, -6);
-#endif
- privptr->stats.rx_dropped++;
- privptr->stats.rx_frame_errors++;
- return;
- }
- pskb->protocol = ntohs(header->type);
- if (header->length <= LL_HEADER_LENGTH) {
-#ifndef DEBUG
- if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
-#endif
- ctc_pr_warn(
- "%s Illegal packet size %d "
- "received (MTU=%d blocklen=%d), "
- "dropping\n", dev->name, header->length,
- dev->mtu, len);
- ch->logflags |= LOG_FLAG_ILLEGALSIZE;
-#ifndef DEBUG
- }
-#endif
-#ifdef DEBUG
- ctc_dump_skb(pskb, -6);
-#endif
- privptr->stats.rx_dropped++;
- privptr->stats.rx_length_errors++;
- return;
- }
- header->length -= LL_HEADER_LENGTH;
- len -= LL_HEADER_LENGTH;
- if ((header->length > skb_tailroom(pskb)) ||
- (header->length > len)) {
-#ifndef DEBUG
- if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
-#endif
- ctc_pr_warn(
- "%s Illegal packet size %d "
- "(beyond the end of received data), "
- "dropping\n", dev->name, header->length);
- ch->logflags |= LOG_FLAG_OVERRUN;
-#ifndef DEBUG
- }
-#endif
-#ifdef DEBUG
- ctc_dump_skb(pskb, -6);
-#endif
- privptr->stats.rx_dropped++;
- privptr->stats.rx_length_errors++;
- return;
- }
- skb_put(pskb, header->length);
- skb_reset_mac_header(pskb);
- len -= header->length;
- skb = dev_alloc_skb(pskb->len);
- if (!skb) {
-#ifndef DEBUG
- if (!(ch->logflags & LOG_FLAG_NOMEM)) {
-#endif
- ctc_pr_warn(
- "%s Out of memory in ctc_unpack_skb\n",
- dev->name);
- ch->logflags |= LOG_FLAG_NOMEM;
-#ifndef DEBUG
- }
-#endif
- privptr->stats.rx_dropped++;
- return;
- }
- skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
- pskb->len);
- skb_reset_mac_header(skb);
- skb->dev = pskb->dev;
- skb->protocol = pskb->protocol;
- pskb->ip_summed = CHECKSUM_UNNECESSARY;
- /**
- * reset logflags
- */
- ch->logflags = 0;
- privptr->stats.rx_packets++;
- privptr->stats.rx_bytes += skb->len;
- netif_rx_ni(skb);
- dev->last_rx = jiffies;
- if (len > 0) {
- skb_pull(pskb, header->length);
- if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
-#ifndef DEBUG
- if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
-#endif
- ctc_pr_warn(
- "%s Overrun in ctc_unpack_skb\n",
- dev->name);
- ch->logflags |= LOG_FLAG_OVERRUN;
-#ifndef DEBUG
- }
-#endif
- return;
- }
- skb_put(pskb, LL_HEADER_LENGTH);
- }
- }
-}
-
-/**
- * Check return code of a preceeding ccw_device call, halt_IO etc...
- *
- * @param ch The channel, the error belongs to.
- * @param return_code The error code to inspect.
- */
-static void
-ccw_check_return_code(struct channel *ch, int return_code, char *msg)
-{
- DBF_TEXT(trace, 5, __FUNCTION__);
- switch (return_code) {
- case 0:
- fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch);
- break;
- case -EBUSY:
- ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg);
- fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch);
- break;
- case -ENODEV:
- ctc_pr_emerg("%s (%s): Invalid device called for IO\n",
- ch->id, msg);
- fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch);
- break;
- case -EIO:
- ctc_pr_emerg("%s (%s): Status pending... \n",
- ch->id, msg);
- fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch);
- break;
- default:
- ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n",
- ch->id, msg, return_code);
- fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch);
- }
-}
-
-/**
- * Check sense of a unit check.
- *
- * @param ch The channel, the sense code belongs to.
- * @param sense The sense code to inspect.
- */
-static void
-ccw_unit_check(struct channel *ch, unsigned char sense)
-{
- DBF_TEXT(trace, 5, __FUNCTION__);
- if (sense & SNS0_INTERVENTION_REQ) {
- if (sense & 0x01) {
- ctc_pr_debug("%s: Interface disc. or Sel. reset "
- "(remote)\n", ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch);
- } else {
- ctc_pr_debug("%s: System reset (remote)\n", ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch);
- }
- } else if (sense & SNS0_EQUIPMENT_CHECK) {
- if (sense & SNS0_BUS_OUT_CHECK) {
- ctc_pr_warn("%s: Hardware malfunction (remote)\n",
- ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch);
- } else {
- ctc_pr_warn("%s: Read-data parity error (remote)\n",
- ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch);
- }
- } else if (sense & SNS0_BUS_OUT_CHECK) {
- if (sense & 0x04) {
- ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch);
- } else {
- ctc_pr_warn("%s: Data-transfer parity error\n", ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch);
- }
- } else if (sense & SNS0_CMD_REJECT) {
- ctc_pr_warn("%s: Command reject\n", ch->id);
- } else if (sense == 0) {
- ctc_pr_debug("%s: Unit check ZERO\n", ch->id);
- fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch);
- } else {
- ctc_pr_warn("%s: Unit Check with sense code: %02x\n",
- ch->id, sense);
- fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch);
- }
-}
-
-static void
-ctc_purge_skb_queue(struct sk_buff_head *q)
-{
- struct sk_buff *skb;
-
- DBF_TEXT(trace, 5, __FUNCTION__);
-
- while ((skb = skb_dequeue(q))) {
- atomic_dec(&skb->users);
- dev_kfree_skb_irq(skb);
- }
-}
-
-static int
-ctc_checkalloc_buffer(struct channel *ch, int warn)
-{
- DBF_TEXT(trace, 5, __FUNCTION__);
- if ((ch->trans_skb == NULL) ||
- (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) {
- if (ch->trans_skb != NULL)
- dev_kfree_skb(ch->trans_skb);
- clear_normalized_cda(&ch->ccw[1]);
- ch->trans_skb = __dev_alloc_skb(ch->max_bufsize,
- GFP_ATOMIC | GFP_DMA);
- if (ch->trans_skb == NULL) {
- if (warn)
- ctc_pr_warn(
- "%s: Couldn't alloc %s trans_skb\n",
- ch->id,
- (CHANNEL_DIRECTION(ch->flags) == READ) ?
- "RX" : "TX");
- return -ENOMEM;
- }
- ch->ccw[1].count = ch->max_bufsize;
- if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
- dev_kfree_skb(ch->trans_skb);
- ch->trans_skb = NULL;
- if (warn)
- ctc_pr_warn(
- "%s: set_normalized_cda for %s "
- "trans_skb failed, dropping packets\n",
- ch->id,
- (CHANNEL_DIRECTION(ch->flags) == READ) ?
- "RX" : "TX");
- return -ENOMEM;
- }
- ch->ccw[1].count = 0;
- ch->trans_skb_data = ch->trans_skb->data;
- ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
- }
- return 0;
-}
-
-/**
- * Dummy NOP action for statemachines
- */
-static void
-fsm_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.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txdone(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
- struct ctc_priv *privptr = dev->priv;
- struct sk_buff *skb;
- int first = 1;
- int i;
- unsigned long duration;
- struct timespec done_stamp = current_kernel_time();
-
- DBF_TEXT(trace, 4, __FUNCTION__);
-
- duration =
- (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
- (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
- if (duration > ch->prof.tx_time)
- ch->prof.tx_time = duration;
-
- if (ch->irb->scsw.count != 0)
- ctc_pr_debug("%s: TX not complete, remaining %d bytes\n",
- dev->name, ch->irb->scsw.count);
- fsm_deltimer(&ch->timer);
- while ((skb = skb_dequeue(&ch->io_queue))) {
- privptr->stats.tx_packets++;
- privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
- if (first) {
- privptr->stats.tx_bytes += 2;
- first = 0;
- }
- atomic_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 (ctc_checkalloc_buffer(ch, 1)) {
- 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);
- privptr->stats.tx_packets++;
- privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
- atomic_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, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- ch->prof.send_stamp = current_kernel_time();
- rc = ccw_device_start(ch->cdev, &ch->ccw[0],
- (unsigned long) ch, 0xff, 0);
- ch->prof.doios_multi++;
- if (rc != 0) {
- privptr->stats.tx_dropped += i;
- privptr->stats.tx_errors += i;
- fsm_deltimer(&ch->timer);
- ccw_check_return_code(ch, rc, "chained TX");
- }
- } else {
- spin_unlock(&ch->collect_lock);
- fsm_newstate(fi, CH_STATE_TXIDLE);
- }
- ctc_clear_busy(dev);
-}
-
-/**
- * Initial data is sent.
- * Notify device statemachine that we are up and
- * running.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txidle(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, CH_STATE_TXIDLE);
- fsm_event(((struct ctc_priv *) ch->netdev->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.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rx(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
- struct ctc_priv *privptr = dev->priv;
- int len = ch->max_bufsize - ch->irb->scsw.count;
- struct sk_buff *skb = ch->trans_skb;
- __u16 block_len = *((__u16 *) skb->data);
- int check_len;
- int rc;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- if (len < 8) {
- ctc_pr_debug("%s: got packet with length %d < 8\n",
- dev->name, len);
- privptr->stats.rx_dropped++;
- privptr->stats.rx_length_errors++;
- goto again;
- }
- if (len > ch->max_bufsize) {
- ctc_pr_debug("%s: got packet with length %d > %d\n",
- dev->name, len, ch->max_bufsize);
- privptr->stats.rx_dropped++;
- privptr->stats.rx_length_errors++;
- goto again;
- }
-
- /**
- * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
- */
- switch (ch->protocol) {
- case CTC_PROTO_S390:
- case CTC_PROTO_OS390:
- check_len = block_len + 2;
- break;
- default:
- check_len = block_len;
- break;
- }
- if ((len < block_len) || (len > check_len)) {
- ctc_pr_debug("%s: got block length %d != rx length %d\n",
- dev->name, block_len, len);
-#ifdef DEBUG
- ctc_dump_skb(skb, 0);
-#endif
- *((__u16 *) skb->data) = len;
- privptr->stats.rx_dropped++;
- privptr->stats.rx_length_errors++;
- goto again;
- }
- block_len -= 2;
- if (block_len > 0) {
- *((__u16 *) skb->data) = block_len;
- ctc_unpack_skb(ch, skb);
- }
- again:
- skb->data = ch->trans_skb_data;
- skb_reset_tail_pointer(skb);
- skb->len = 0;
- if (ctc_checkalloc_buffer(ch, 1))
- return;
- ch->ccw[1].count = ch->max_bufsize;
- rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
- if (rc != 0)
- ccw_check_return_code(ch, rc, "normal RX");
-}
-
-static void ch_action_rxidle(fsm_instance * fi, int event, void *arg);
-
-/**
- * Initialize connection by sending a __u16 of value 0.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_firstio(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- int rc;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
-
- if (fsm_getstate(fi) == CH_STATE_TXIDLE)
- ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id);
- fsm_deltimer(&ch->timer);
- if (ctc_checkalloc_buffer(ch, 1))
- return;
- if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) &&
- (ch->protocol == CTC_PROTO_OS390)) {
- /* OS/390 resp. z/OS */
- if (CHANNEL_DIRECTION(ch->flags) == READ) {
- *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC,
- CH_EVENT_TIMER, ch);
- ch_action_rxidle(fi, event, arg);
- } else {
- struct net_device *dev = ch->netdev;
- fsm_newstate(fi, CH_STATE_TXIDLE);
- fsm_event(((struct ctc_priv *) dev->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) == WRITE) ||
- (ch->protocol != CTC_PROTO_S390))
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
-
- *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
- ch->ccw[1].count = 2; /* Transfer only length */
-
- fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
- ? CH_STATE_RXINIT : CH_STATE_TXINIT);
- rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
- if (rc != 0) {
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, CH_STATE_SETUPWAIT);
- ccw_check_return_code(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) == READ) &&
- (ch->protocol == CTC_PROTO_S390)) {
- struct net_device *dev = ch->netdev;
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP,
- dev);
- }
-}
-
-/**
- * Got initial data, check it. If OK,
- * notify device statemachine that we are up and
- * running.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxidle(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
- __u16 buflen;
- int rc;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- buflen = *((__u16 *) ch->trans_skb->data);
-#ifdef DEBUG
- ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen);
-#endif
- if (buflen >= CTC_INITIAL_BLOCKLEN) {
- if (ctc_checkalloc_buffer(ch, 1))
- return;
- ch->ccw[1].count = ch->max_bufsize;
- fsm_newstate(fi, CH_STATE_RXIDLE);
- rc = ccw_device_start(ch->cdev, &ch->ccw[0],
- (unsigned long) ch, 0xff, 0);
- if (rc != 0) {
- fsm_newstate(fi, CH_STATE_RXINIT);
- ccw_check_return_code(ch, rc, "initial RX");
- } else
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXUP, dev);
- } else {
- ctc_pr_debug("%s: Initial RX count %d not %d\n",
- dev->name, buflen, CTC_INITIAL_BLOCKLEN);
- ch_action_firstio(fi, event, arg);
- }
-}
-
-/**
- * Set channel into extended mode.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_setmode(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- int rc;
- unsigned long saveflags;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- fsm_newstate(fi, CH_STATE_SETUPWAIT);
- saveflags = 0; /* avoids compiler warning with
- spin_unlock_irqrestore */
- if (event == CH_EVENT_TIMER) // only for timer not yet locked
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
- rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0);
- if (event == CH_EVENT_TIMER)
- spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
- if (rc != 0) {
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, CH_STATE_STARTWAIT);
- ccw_check_return_code(ch, rc, "set Mode");
- } else
- ch->retry = 0;
-}
-
-/**
- * Setup channel.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_start(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- unsigned long saveflags;
- int rc;
- struct net_device *dev;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- if (ch == NULL) {
- ctc_pr_warn("ch_action_start ch=NULL\n");
- return;
- }
- if (ch->netdev == NULL) {
- ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id);
- return;
- }
- dev = ch->netdev;
-
-#ifdef DEBUG
- ctc_pr_debug("%s: %s channel start\n", dev->name,
- (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
-#endif
-
- 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) == 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 (ctc_checkalloc_buffer(ch, 0)) {
- ctc_pr_notice(
- "%s: Could not allocate %s trans_skb, delaying "
- "allocation until first transfer\n",
- dev->name,
- (CHANNEL_DIRECTION(ch->flags) == 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, CH_STATE_STARTWAIT);
- fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
- rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
- spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
- if (rc != 0) {
- if (rc != -EBUSY)
- fsm_deltimer(&ch->timer);
- ccw_check_return_code(ch, rc, "initial HaltIO");
- }
-#ifdef DEBUG
- ctc_pr_debug("ctc: %s(): leaving\n", __func__);
-#endif
-}
-
-/**
- * Shutdown a channel.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_haltio(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- unsigned long saveflags;
- int rc;
- int oldstate;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- saveflags = 0; /* avoids comp warning with
- spin_unlock_irqrestore */
- if (event == CH_EVENT_STOP) // only for STOP not yet locked
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
- oldstate = fsm_getstate(fi);
- fsm_newstate(fi, CH_STATE_TERM);
- rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
- if (event == CH_EVENT_STOP)
- spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
- if (rc != 0) {
- if (rc != -EBUSY) {
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, oldstate);
- }
- ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio");
- }
-}
-
-/**
- * A channel has successfully been halted.
- * Cleanup it's queue and notify interface statemachine.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_stopped(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, CH_STATE_STOPPED);
- 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) == READ) {
- skb_queue_purge(&ch->io_queue);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXDOWN, dev);
- } else {
- ctc_purge_skb_queue(&ch->io_queue);
- spin_lock(&ch->collect_lock);
- ctc_purge_skb_queue(&ch->collect_queue);
- ch->collect_len = 0;
- spin_unlock(&ch->collect_lock);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- }
-}
-
-/**
- * A stop command from device statemachine arrived and we are in
- * not operational mode. Set state to stopped.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_stop(fsm_instance * fi, int event, void *arg)
-{
- fsm_newstate(fi, CH_STATE_STOPPED);
-}
-
-/**
- * A machine check for no path, not operational status or gone device has
- * happened.
- * Cleanup queue and notify interface statemachine.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_fail(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- fsm_newstate(fi, CH_STATE_NOTOP);
- if (CHANNEL_DIRECTION(ch->flags) == READ) {
- skb_queue_purge(&ch->io_queue);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXDOWN, dev);
- } else {
- ctc_purge_skb_queue(&ch->io_queue);
- spin_lock(&ch->collect_lock);
- ctc_purge_skb_queue(&ch->collect_queue);
- ch->collect_len = 0;
- spin_unlock(&ch->collect_lock);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- }
-}
-
-/**
- * Handle error during setup of channel.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_setuperr(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
- /**
- * 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) == CH_STATE_SETUPWAIT) &&
- ((event == CH_EVENT_UC_RCRESET) ||
- (event == CH_EVENT_UC_RSRESET))) {
- fsm_newstate(fi, CH_STATE_STARTRETRY);
- fsm_deltimer(&ch->timer);
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- if (CHANNEL_DIRECTION(ch->flags) == READ) {
- int rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
- if (rc != 0)
- ccw_check_return_code(
- ch, rc, "HaltIO in ch_action_setuperr");
- }
- return;
- }
-
- ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n",
- dev->name, ch_event_names[event],
- (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
- fsm_getstate_str(fi));
- if (CHANNEL_DIRECTION(ch->flags) == READ) {
- fsm_newstate(fi, CH_STATE_RXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXDOWN, dev);
- } else {
- fsm_newstate(fi, CH_STATE_TXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- }
-}
-
-/**
- * Restart a channel after an error.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_restart(fsm_instance * fi, int event, void *arg)
-{
- unsigned long saveflags;
- int oldstate;
- int rc;
-
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- ctc_pr_debug("%s: %s channel restart\n", dev->name,
- (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- oldstate = fsm_getstate(fi);
- fsm_newstate(fi, CH_STATE_STARTWAIT);
- saveflags = 0; /* avoids compiler warning with
- spin_unlock_irqrestore */
- if (event == CH_EVENT_TIMER) // only for timer not yet locked
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
- rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
- if (event == CH_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);
- }
- ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart");
- }
-}
-
-/**
- * Handle error during RX initial handshake (exchange of
- * 0-length block header)
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxiniterr(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
- if (event == CH_EVENT_TIMER) {
- fsm_deltimer(&ch->timer);
- ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name);
- if (ch->retry++ < 3)
- ch_action_restart(fi, event, arg);
- else {
- fsm_newstate(fi, CH_STATE_RXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXDOWN, dev);
- }
- } else
- ctc_pr_warn("%s: Error during RX init handshake\n", dev->name);
-}
-
-/**
- * Notify device statemachine if we gave up initialization
- * of RX channel.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxinitfail(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
- fsm_newstate(fi, CH_STATE_RXERR);
- ctc_pr_warn("%s: RX initialization failed\n", dev->name);
- ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
-}
-
-/**
- * Handle RX Unit check remote reset (remote disconnected)
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_rxdisc(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct channel *ch2;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n",
- dev->name);
-
- /**
- * Notify device statemachine
- */
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev);
-
- fsm_newstate(fi, CH_STATE_DTERM);
- ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE];
- fsm_newstate(ch2->fsm, CH_STATE_DTERM);
-
- ccw_device_halt(ch->cdev, (unsigned long) ch);
- ccw_device_halt(ch2->cdev, (unsigned long) ch2);
-}
-
-/**
- * Handle error during TX channel initialization.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txiniterr(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(setup, 2, __FUNCTION__);
- if (event == CH_EVENT_TIMER) {
- fsm_deltimer(&ch->timer);
- ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name);
- if (ch->retry++ < 3)
- ch_action_restart(fi, event, arg);
- else {
- fsm_newstate(fi, CH_STATE_TXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- }
- } else
- ctc_pr_warn("%s: Error during TX init handshake\n", dev->name);
-}
-
-/**
- * Handle TX timeout by retrying operation.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_txretry(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
- unsigned long saveflags;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- if (ch->retry++ > 3) {
- ctc_pr_debug("%s: TX retry failed, restarting channel\n",
- dev->name);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- ch_action_restart(fi, event, arg);
- } else {
- struct sk_buff *skb;
-
- ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry);
- if ((skb = skb_peek(&ch->io_queue))) {
- int rc = 0;
-
- clear_normalized_cda(&ch->ccw[4]);
- ch->ccw[4].count = skb->len;
- if (set_normalized_cda(&ch->ccw[4], skb->data)) {
- ctc_pr_debug(
- "%s: IDAL alloc failed, chan restart\n",
- dev->name);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- ch_action_restart(fi, event, arg);
- return;
- }
- fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
- saveflags = 0; /* avoids compiler warning with
- spin_unlock_irqrestore */
- if (event == CH_EVENT_TIMER) // only for TIMER not yet locked
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev),
- saveflags);
- rc = ccw_device_start(ch->cdev, &ch->ccw[3],
- (unsigned long) ch, 0xff, 0);
- if (event == CH_EVENT_TIMER)
- spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
- saveflags);
- if (rc != 0) {
- fsm_deltimer(&ch->timer);
- ccw_check_return_code(ch, rc, "TX in ch_action_txretry");
- ctc_purge_skb_queue(&ch->io_queue);
- }
- }
- }
-
-}
-
-/**
- * Handle fatal errors during an I/O command.
- *
- * @param fi An instance of a channel statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from channel * upon call.
- */
-static void
-ch_action_iofatal(fsm_instance * fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *) arg;
- struct net_device *dev = ch->netdev;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_deltimer(&ch->timer);
- if (CHANNEL_DIRECTION(ch->flags) == READ) {
- ctc_pr_debug("%s: RX I/O error\n", dev->name);
- fsm_newstate(fi, CH_STATE_RXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_RXDOWN, dev);
- } else {
- ctc_pr_debug("%s: TX I/O error\n", dev->name);
- fsm_newstate(fi, CH_STATE_TXERR);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm,
- DEV_EVENT_TXDOWN, dev);
- }
-}
-
-static void
-ch_action_reinit(fsm_instance *fi, int event, void *arg)
-{
- struct channel *ch = (struct channel *)arg;
- struct net_device *dev = ch->netdev;
- struct ctc_priv *privptr = dev->priv;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- ch_action_iofatal(fi, event, arg);
- fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev);
-}
-
-/**
- * The statemachine for a channel.
- */
-static const fsm_node ch_fsm[] = {
- {CH_STATE_STOPPED, CH_EVENT_STOP, fsm_action_nop },
- {CH_STATE_STOPPED, CH_EVENT_START, ch_action_start },
- {CH_STATE_STOPPED, CH_EVENT_FINSTAT, fsm_action_nop },
- {CH_STATE_STOPPED, CH_EVENT_MC_FAIL, fsm_action_nop },
-
- {CH_STATE_NOTOP, CH_EVENT_STOP, ch_action_stop },
- {CH_STATE_NOTOP, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_NOTOP, CH_EVENT_FINSTAT, fsm_action_nop },
- {CH_STATE_NOTOP, CH_EVENT_MC_FAIL, fsm_action_nop },
- {CH_STATE_NOTOP, CH_EVENT_MC_GOOD, ch_action_start },
-
- {CH_STATE_STARTWAIT, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_STARTWAIT, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_STARTWAIT, CH_EVENT_FINSTAT, ch_action_setmode },
- {CH_STATE_STARTWAIT, CH_EVENT_TIMER, ch_action_setuperr },
- {CH_STATE_STARTWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_STARTWAIT, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_STARTWAIT, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_STARTRETRY, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_STARTRETRY, CH_EVENT_TIMER, ch_action_setmode },
- {CH_STATE_STARTRETRY, CH_EVENT_FINSTAT, fsm_action_nop },
- {CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_SETUPWAIT, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_SETUPWAIT, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_SETUPWAIT, CH_EVENT_FINSTAT, ch_action_firstio },
- {CH_STATE_SETUPWAIT, CH_EVENT_UC_RCRESET, ch_action_setuperr },
- {CH_STATE_SETUPWAIT, CH_EVENT_UC_RSRESET, ch_action_setuperr },
- {CH_STATE_SETUPWAIT, CH_EVENT_TIMER, ch_action_setmode },
- {CH_STATE_SETUPWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_SETUPWAIT, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_SETUPWAIT, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_RXINIT, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_RXINIT, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_RXINIT, CH_EVENT_FINSTAT, ch_action_rxidle },
- {CH_STATE_RXINIT, CH_EVENT_UC_RCRESET, ch_action_rxiniterr },
- {CH_STATE_RXINIT, CH_EVENT_UC_RSRESET, ch_action_rxiniterr },
- {CH_STATE_RXINIT, CH_EVENT_TIMER, ch_action_rxiniterr },
- {CH_STATE_RXINIT, CH_EVENT_ATTNBUSY, ch_action_rxinitfail },
- {CH_STATE_RXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_RXINIT, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_RXINIT, CH_EVENT_UC_ZERO, ch_action_firstio },
- {CH_STATE_RXINIT, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_RXIDLE, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_RXIDLE, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_RXIDLE, CH_EVENT_FINSTAT, ch_action_rx },
- {CH_STATE_RXIDLE, CH_EVENT_UC_RCRESET, ch_action_rxdisc },
-// {CH_STATE_RXIDLE, CH_EVENT_UC_RSRESET, ch_action_rxretry },
- {CH_STATE_RXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_RXIDLE, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_RXIDLE, CH_EVENT_MC_FAIL, ch_action_fail },
- {CH_STATE_RXIDLE, CH_EVENT_UC_ZERO, ch_action_rx },
-
- {CH_STATE_TXINIT, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_TXINIT, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_TXINIT, CH_EVENT_FINSTAT, ch_action_txidle },
- {CH_STATE_TXINIT, CH_EVENT_UC_RCRESET, ch_action_txiniterr },
- {CH_STATE_TXINIT, CH_EVENT_UC_RSRESET, ch_action_txiniterr },
- {CH_STATE_TXINIT, CH_EVENT_TIMER, ch_action_txiniterr },
- {CH_STATE_TXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_TXINIT, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_TXINIT, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_TXIDLE, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_TXIDLE, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_TXIDLE, CH_EVENT_FINSTAT, ch_action_firstio },
- {CH_STATE_TXIDLE, CH_EVENT_UC_RCRESET, fsm_action_nop },
- {CH_STATE_TXIDLE, CH_EVENT_UC_RSRESET, fsm_action_nop },
- {CH_STATE_TXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_TXIDLE, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_TXIDLE, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_TERM, CH_EVENT_STOP, fsm_action_nop },
- {CH_STATE_TERM, CH_EVENT_START, ch_action_restart },
- {CH_STATE_TERM, CH_EVENT_FINSTAT, ch_action_stopped },
- {CH_STATE_TERM, CH_EVENT_UC_RCRESET, fsm_action_nop },
- {CH_STATE_TERM, CH_EVENT_UC_RSRESET, fsm_action_nop },
- {CH_STATE_TERM, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_DTERM, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_DTERM, CH_EVENT_START, ch_action_restart },
- {CH_STATE_DTERM, CH_EVENT_FINSTAT, ch_action_setmode },
- {CH_STATE_DTERM, CH_EVENT_UC_RCRESET, fsm_action_nop },
- {CH_STATE_DTERM, CH_EVENT_UC_RSRESET, fsm_action_nop },
- {CH_STATE_DTERM, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_TX, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_TX, CH_EVENT_START, fsm_action_nop },
- {CH_STATE_TX, CH_EVENT_FINSTAT, ch_action_txdone },
- {CH_STATE_TX, CH_EVENT_UC_RCRESET, ch_action_txretry },
- {CH_STATE_TX, CH_EVENT_UC_RSRESET, ch_action_txretry },
- {CH_STATE_TX, CH_EVENT_TIMER, ch_action_txretry },
- {CH_STATE_TX, CH_EVENT_IO_ENODEV, ch_action_iofatal },
- {CH_STATE_TX, CH_EVENT_IO_EIO, ch_action_reinit },
- {CH_STATE_TX, CH_EVENT_MC_FAIL, ch_action_fail },
-
- {CH_STATE_RXERR, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_TXERR, CH_EVENT_STOP, ch_action_haltio },
- {CH_STATE_TXERR, CH_EVENT_MC_FAIL, ch_action_fail },
- {CH_STATE_RXERR, CH_EVENT_MC_FAIL, ch_action_fail },
-};
-
-static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node);
-
-/**
- * Functions related to setup and device detection.
- *****************************************************************************/
-
-static inline int
-less_than(char *id1, char *id2)
-{
- int dev1, dev2, i;
-
- for (i = 0; i < 5; i++) {
- id1++;
- id2++;
- }
- dev1 = simple_strtoul(id1, &id1, 16);
- dev2 = simple_strtoul(id2, &id2, 16);
-
- return (dev1 < dev2);
-}
-
-/**
- * Add a new channel to the list of channels.
- * Keeps the channel list sorted.
- *
- * @param cdev The ccw_device to be added.
- * @param type The type class of the new channel.
- *
- * @return 0 on success, !0 on error.
- */
-static int
-add_channel(struct ccw_device *cdev, enum channel_types type)
-{
- struct channel **c = &channels;
- struct channel *ch;
-
- DBF_TEXT(trace, 2, __FUNCTION__);
- ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
- if (!ch) {
- ctc_pr_warn("ctc: Out of memory in add_channel\n");
- return -1;
- }
- /* assure all flags and counters are reset */
- ch->ccw = kzalloc(8 * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
- if (!ch->ccw) {
- kfree(ch);
- ctc_pr_warn("ctc: Out of memory in add_channel\n");
- return -1;
- }
-
-
- /**
- * "static" ccws are used in the following way:
- *
- * ccw[0..2] (Channel program for generic I/O):
- * 0: prepare
- * 1: read or write (depending on direction) with fixed
- * buffer (idal allocated once when buffer is allocated)
- * 2: nop
- * ccw[3..5] (Channel program for direct write of packets)
- * 3: prepare
- * 4: write (idal allocated on every write).
- * 5: nop
- * ccw[6..7] (Channel program for initial channel setup):
- * 6: set extended mode
- * 7: nop
- *
- * ch->ccw[0..5] are initialized in ch_action_start because
- * the channel's direction is yet unknown here.
- */
- ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
- ch->ccw[6].flags = CCW_FLAG_SLI;
-
- ch->ccw[7].cmd_code = CCW_CMD_NOOP;
- ch->ccw[7].flags = CCW_FLAG_SLI;
-
- ch->cdev = cdev;
- snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id);
- ch->type = type;
- ch->fsm = init_fsm(ch->id, ch_state_names,
- ch_event_names, NR_CH_STATES, NR_CH_EVENTS,
- ch_fsm, CH_FSM_LEN, GFP_KERNEL);
- if (ch->fsm == NULL) {
- ctc_pr_warn("ctc: Could not create FSM in add_channel\n");
- kfree(ch->ccw);
- kfree(ch);
- return -1;
- }
- fsm_newstate(ch->fsm, CH_STATE_IDLE);
- ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
- if (!ch->irb) {
- ctc_pr_warn("ctc: Out of memory in add_channel\n");
- kfree_fsm(ch->fsm);
- kfree(ch->ccw);
- kfree(ch);
- return -1;
- }
- while (*c && less_than((*c)->id, ch->id))
- c = &(*c)->next;
- if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) {
- ctc_pr_debug(
- "ctc: add_channel: device %s already in list, "
- "using old entry\n", (*c)->id);
- kfree(ch->irb);
- kfree_fsm(ch->fsm);
- kfree(ch->ccw);
- kfree(ch);
- return 0;
- }
-
- spin_lock_init(&ch->collect_lock);
-
- fsm_settimer(ch->fsm, &ch->timer);
- skb_queue_head_init(&ch->io_queue);
- skb_queue_head_init(&ch->collect_queue);
- ch->next = *c;
- *c = ch;
- return 0;
-}
-
-/**
- * Release a specific channel in the channel list.
- *
- * @param ch Pointer to channel struct to be released.
- */
-static void
-channel_free(struct channel *ch)
-{
- ch->flags &= ~CHANNEL_FLAGS_INUSE;
- fsm_newstate(ch->fsm, CH_STATE_IDLE);
-}
-
-/**
- * Remove a specific channel in the channel list.
- *
- * @param ch Pointer to channel struct to be released.
- */
-static void
-channel_remove(struct channel *ch)
-{
- struct channel **c = &channels;
-
- DBF_TEXT(trace, 2, __FUNCTION__);
- if (ch == NULL)
- return;
-
- channel_free(ch);
- while (*c) {
- if (*c == ch) {
- *c = ch->next;
- fsm_deltimer(&ch->timer);
- kfree_fsm(ch->fsm);
- clear_normalized_cda(&ch->ccw[4]);
- if (ch->trans_skb != NULL) {
- clear_normalized_cda(&ch->ccw[1]);
- dev_kfree_skb(ch->trans_skb);
- }
- kfree(ch->ccw);
- kfree(ch->irb);
- kfree(ch);
- return;
- }
- c = &((*c)->next);
- }
-}
-
-/**
- * Get a specific channel from the channel list.
- *
- * @param type Type of channel we are interested in.
- * @param id Id of channel we are interested in.
- * @param direction Direction we want to use this channel for.
- *
- * @return Pointer to a channel or NULL if no matching channel available.
- */
-static struct channel
-*
-channel_get(enum channel_types type, char *id, int direction)
-{
- struct channel *ch = channels;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
-#ifdef DEBUG
- ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n",
- __func__, id, type);
-#endif
-
- while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) {
-#ifdef DEBUG
- ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n",
- __func__, ch, ch->id, ch->type);
-#endif
- ch = ch->next;
- }
-#ifdef DEBUG
- ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n",
- __func__, ch, ch->id, ch->type);
-#endif
- if (!ch) {
- ctc_pr_warn("ctc: %s(): channel with id %s "
- "and type %d not found in channel list\n",
- __func__, id, type);
- } else {
- if (ch->flags & CHANNEL_FLAGS_INUSE)
- ch = NULL;
- else {
- ch->flags |= CHANNEL_FLAGS_INUSE;
- ch->flags &= ~CHANNEL_FLAGS_RWMASK;
- ch->flags |= (direction == WRITE)
- ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
- fsm_newstate(ch->fsm, CH_STATE_STOPPED);
- }
- }
- return ch;
-}
-
-/**
- * Return the channel type by name.
- *
- * @param name Name of network interface.
- *
- * @return Type class of channel to be used for that interface.
- */
-static enum channel_types inline
-extract_channel_media(char *name)
-{
- enum channel_types ret = channel_type_unknown;
-
- if (name != NULL) {
- if (strncmp(name, "ctc", 3) == 0)
- ret = channel_type_parallel;
- if (strncmp(name, "escon", 5) == 0)
- ret = channel_type_escon;
- }
- return ret;
-}
-
-static long
-__ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb)
-{
- if (!IS_ERR(irb))
- return 0;
-
- switch (PTR_ERR(irb)) {
- case -EIO:
- ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id);
-// CTC_DBF_TEXT(trace, 2, "ckirberr");
-// CTC_DBF_TEXT_(trace, 2, " rc%d", -EIO);
- break;
- case -ETIMEDOUT:
- ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id);
-// CTC_DBF_TEXT(trace, 2, "ckirberr");
-// CTC_DBF_TEXT_(trace, 2, " rc%d", -ETIMEDOUT);
- break;
- default:
- ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb),
- cdev->dev.bus_id);
-// CTC_DBF_TEXT(trace, 2, "ckirberr");
-// CTC_DBF_TEXT(trace, 2, " rc???");
- }
- return PTR_ERR(irb);
-}
-
-/**
- * Main IRQ handler.
- *
- * @param cdev The ccw_device the interrupt is for.
- * @param intparm interruption parameter.
- * @param irb interruption response block.
- */
-static void
-ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
-{
- struct channel *ch;
- struct net_device *dev;
- struct ctc_priv *priv;
-
- DBF_TEXT(trace, 5, __FUNCTION__);
- if (__ctc_check_irb_error(cdev, irb))
- return;
-
- /* Check for unsolicited interrupts. */
- if (!cdev->dev.driver_data) {
- ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n",
- cdev->dev.bus_id, irb->scsw.cstat,
- irb->scsw.dstat);
- return;
- }
-
- priv = ((struct ccwgroup_device *)cdev->dev.driver_data)
- ->dev.driver_data;
-
- /* Try to extract channel from driver data. */
- if (priv->channel[READ]->cdev == cdev)
- ch = priv->channel[READ];
- else if (priv->channel[WRITE]->cdev == cdev)
- ch = priv->channel[WRITE];
- else {
- ctc_pr_err("ctc: Can't determine channel for interrupt, "
- "device %s\n", cdev->dev.bus_id);
- return;
- }
-
- dev = (struct net_device *) (ch->netdev);
- if (dev == NULL) {
- ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n",
- cdev->dev.bus_id, ch);
- return;
- }
-
-#ifdef DEBUG
- ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n",
- dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat);
-#endif
-
- /* Copy interruption response block. */
- memcpy(ch->irb, irb, sizeof(struct irb));
-
- /* Check for good subchannel return code, otherwise error message */
- if (ch->irb->scsw.cstat) {
- fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch);
- ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n",
- dev->name, ch->id, ch->irb->scsw.cstat,
- ch->irb->scsw.dstat);
- return;
- }
-
- /* Check the reason-code of a unit check */
- if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) {
- ccw_unit_check(ch, ch->irb->ecw[0]);
- return;
- }
- if (ch->irb->scsw.dstat & DEV_STAT_BUSY) {
- if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION)
- fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch);
- else
- fsm_event(ch->fsm, CH_EVENT_BUSY, ch);
- return;
- }
- if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) {
- fsm_event(ch->fsm, CH_EVENT_ATTN, ch);
- return;
- }
- if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) ||
- (ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) ||
- (ch->irb->scsw.stctl ==
- (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
- fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch);
- else
- fsm_event(ch->fsm, CH_EVENT_IRQ, ch);
-
-}
-
-/**
- * Actions for interface - statemachine.
- *****************************************************************************/
-
-/**
- * Startup channels by sending CH_EVENT_START to each channel.
- *
- * @param fi An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param 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 = (struct net_device *) arg;
- struct ctc_priv *privptr = dev->priv;
- int direction;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
- fsm_deltimer(&privptr->restart_timer);
- fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
- for (direction = READ; direction <= WRITE; direction++) {
- struct channel *ch = privptr->channel[direction];
- fsm_event(ch->fsm, CH_EVENT_START, ch);
- }
-}
-
-/**
- * Shutdown channels by sending CH_EVENT_STOP to each channel.
- *
- * @param fi An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_stop(fsm_instance * fi, int event, void *arg)
-{
- struct net_device *dev = (struct net_device *) arg;
- struct ctc_priv *privptr = dev->priv;
- int direction;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
- for (direction = READ; direction <= WRITE; direction++) {
- struct channel *ch = privptr->channel[direction];
- fsm_event(ch->fsm, CH_EVENT_STOP, ch);
- }
-}
-static void
-dev_action_restart(fsm_instance *fi, int event, void *arg)
-{
- struct net_device *dev = (struct net_device *)arg;
- struct ctc_priv *privptr = dev->priv;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- ctc_pr_debug("%s: Restarting\n", dev->name);
- dev_action_stop(fi, event, arg);
- fsm_event(privptr->fsm, DEV_EVENT_STOP, dev);
- fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC,
- DEV_EVENT_START, dev);
-}
-
-/**
- * Called from channel statemachine
- * when a channel is up and running.
- *
- * @param fi An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param 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 = (struct net_device *) arg;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- 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);
- ctc_pr_info("%s: connected with remote side\n",
- dev->name);
- ctc_clear_busy(dev);
- }
- break;
- case DEV_STATE_STARTWAIT_TX:
- if (event == DEV_EVENT_TXUP) {
- fsm_newstate(fi, DEV_STATE_RUNNING);
- ctc_pr_info("%s: connected with remote side\n",
- dev->name);
- ctc_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;
- }
-}
-
-/**
- * Called from channel statemachine
- * when a channel has been shutdown.
- *
- * @param fi An instance of an interface statemachine.
- * @param event The event, just happened.
- * @param arg Generic pointer, casted from struct net_device * upon call.
- */
-static void
-dev_action_chdown(fsm_instance * fi, int event, void *arg)
-{
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- 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;
- }
-}
-
-static 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, fsm_action_nop },
- {DEV_STATE_RUNNING, DEV_EVENT_RXUP, fsm_action_nop },
- {DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
-};
-
-static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node);
-
-/**
- * Transmit a packet.
- * This is a helper function for ctc_tx().
- *
- * @param ch Channel to be used for sending.
- * @param skb Pointer to struct sk_buff of packet to send.
- * The linklevel header has already been set up
- * by ctc_tx().
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-transmit_skb(struct channel *ch, struct sk_buff *skb)
-{
- unsigned long saveflags;
- struct ll_header header;
- int rc = 0;
-
- DBF_TEXT(trace, 5, __FUNCTION__);
- /* we need to acquire the lock for testing the state
- * otherwise we can have an IRQ changing the state to
- * TXIDLE after the test but before acquiring the lock.
- */
- spin_lock_irqsave(&ch->collect_lock, saveflags);
- if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) {
- int l = skb->len + LL_HEADER_LENGTH;
-
- if (ch->collect_len + l > ch->max_bufsize - 2) {
- spin_unlock_irqrestore(&ch->collect_lock, saveflags);
- return -EBUSY;
- } else {
- atomic_inc(&skb->users);
- header.length = l;
- header.type = skb->protocol;
- header.unused = 0;
- memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
- LL_HEADER_LENGTH);
- skb_queue_tail(&ch->collect_queue, skb);
- ch->collect_len += l;
- }
- spin_unlock_irqrestore(&ch->collect_lock, saveflags);
- } else {
- __u16 block_len;
- int ccw_idx;
- struct sk_buff *nskb;
- unsigned long hi;
- spin_unlock_irqrestore(&ch->collect_lock, saveflags);
- /**
- * Protect skb against beeing free'd by upper
- * layers.
- */
- atomic_inc(&skb->users);
- ch->prof.txlen += skb->len;
- header.length = skb->len + LL_HEADER_LENGTH;
- header.type = skb->protocol;
- header.unused = 0;
- memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
- LL_HEADER_LENGTH);
- block_len = skb->len + 2;
- *((__u16 *) skb_push(skb, 2)) = block_len;
-
- /**
- * IDAL support in CTC is broken, so we have to
- * care about skb's above 2G ourselves.
- */
- hi = ((unsigned long)skb_tail_pointer(skb) +
- LL_HEADER_LENGTH) >> 31;
- if (hi) {
- nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
- if (!nskb) {
- atomic_dec(&skb->users);
- skb_pull(skb, LL_HEADER_LENGTH + 2);
- ctc_clear_busy(ch->netdev);
- return -ENOMEM;
- } else {
- memcpy(skb_put(nskb, skb->len),
- skb->data, skb->len);
- atomic_inc(&nskb->users);
- atomic_dec(&skb->users);
- dev_kfree_skb_irq(skb);
- skb = nskb;
- }
- }
-
- ch->ccw[4].count = block_len;
- if (set_normalized_cda(&ch->ccw[4], skb->data)) {
- /**
- * idal allocation failed, try via copying to
- * trans_skb. trans_skb usually has a pre-allocated
- * idal.
- */
- if (ctc_checkalloc_buffer(ch, 1)) {
- /**
- * Remove our header. It gets added
- * again on retransmit.
- */
- atomic_dec(&skb->users);
- skb_pull(skb, LL_HEADER_LENGTH + 2);
- ctc_clear_busy(ch->netdev);
- return -EBUSY;
- }
-
- skb_reset_tail_pointer(ch->trans_skb);
- ch->trans_skb->len = 0;
- ch->ccw[1].count = skb->len;
- skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
- skb->len),
- skb->len);
- atomic_dec(&skb->users);
- dev_kfree_skb_irq(skb);
- ccw_idx = 0;
- } else {
- skb_queue_tail(&ch->io_queue, skb);
- ccw_idx = 3;
- }
- ch->retry = 0;
- fsm_newstate(ch->fsm, CH_STATE_TX);
- fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
- spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
- ch->prof.send_stamp = current_kernel_time();
- rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
- (unsigned long) ch, 0xff, 0);
- spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
- if (ccw_idx == 3)
- ch->prof.doios_single++;
- if (rc != 0) {
- fsm_deltimer(&ch->timer);
- ccw_check_return_code(ch, rc, "single skb TX");
- if (ccw_idx == 3)
- skb_dequeue_tail(&ch->io_queue);
- /**
- * Remove our header. It gets added
- * again on retransmit.
- */
- skb_pull(skb, LL_HEADER_LENGTH + 2);
- } else {
- if (ccw_idx == 0) {
- struct net_device *dev = ch->netdev;
- struct ctc_priv *privptr = dev->priv;
- privptr->stats.tx_packets++;
- privptr->stats.tx_bytes +=
- skb->len - LL_HEADER_LENGTH;
- }
- }
- }
-
- ctc_clear_busy(ch->netdev);
- return rc;
-}
-
-/**
- * Interface API for upper network layers
- *****************************************************************************/
-
-/**
- * Open an interface.
- * Called from generic network layer when ifconfig up is run.
- *
- * @param dev Pointer to interface struct.
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-ctc_open(struct net_device * dev)
-{
- DBF_TEXT(trace, 5, __FUNCTION__);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev);
- return 0;
-}
-
-/**
- * Close an interface.
- * Called from generic network layer when ifconfig down is run.
- *
- * @param dev Pointer to interface struct.
- *
- * @return 0 on success, -ERRNO on failure. (Never fails.)
- */
-static int
-ctc_close(struct net_device * dev)
-{
- DBF_TEXT(trace, 5, __FUNCTION__);
- fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev);
- return 0;
-}
-
-/**
- * Start transmission of a packet.
- * Called from generic network device layer.
- *
- * @param skb Pointer to buffer containing the packet.
- * @param dev Pointer to interface struct.
- *
- * @return 0 if packet consumed, !0 if packet rejected.
- * Note: If we return !0, then the packet is free'd by
- * the generic network layer.
- */
-static int
-ctc_tx(struct sk_buff *skb, struct net_device * dev)
-{
- int rc = 0;
- struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
-
- DBF_TEXT(trace, 5, __FUNCTION__);
- /**
- * Some sanity checks ...
- */
- if (skb == NULL) {
- ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name);
- privptr->stats.tx_dropped++;
- return 0;
- }
- if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
- ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n",
- dev->name, LL_HEADER_LENGTH + 2);
- dev_kfree_skb(skb);
- privptr->stats.tx_dropped++;
- return 0;
- }
-
- /**
- * If channels are not running, try to restart them
- * and throw away packet.
- */
- if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
- fsm_event(privptr->fsm, DEV_EVENT_START, dev);
- dev_kfree_skb(skb);
- privptr->stats.tx_dropped++;
- privptr->stats.tx_errors++;
- privptr->stats.tx_carrier_errors++;
- return 0;
- }
-
- if (ctc_test_and_set_busy(dev))
- return -EBUSY;
-
- dev->trans_start = jiffies;
- if (transmit_skb(privptr->channel[WRITE], skb) != 0)
- rc = 1;
- return rc;
-}
-
-/**
- * Sets MTU of an interface.
- *
- * @param dev Pointer to interface struct.
- * @param new_mtu The new MTU to use for this interface.
- *
- * @return 0 on success, -EINVAL if MTU is out of valid range.
- * (valid range is 576 .. 65527). If VM is on the
- * remote side, maximum MTU is 32760, however this is
- * <em>not</em> checked here.
- */
-static int
-ctc_change_mtu(struct net_device * dev, int new_mtu)
-{
- struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- if ((new_mtu < 576) || (new_mtu > 65527) ||
- (new_mtu > (privptr->channel[READ]->max_bufsize -
- LL_HEADER_LENGTH - 2)))
- return -EINVAL;
- dev->mtu = new_mtu;
- dev->hard_header_len = LL_HEADER_LENGTH + 2;
- return 0;
-}
-
-/**
- * Returns interface statistics of a device.
- *
- * @param dev Pointer to interface struct.
- *
- * @return Pointer to stats struct of this interface.
- */
-static struct net_device_stats *
-ctc_stats(struct net_device * dev)
-{
- return &((struct ctc_priv *) dev->priv)->stats;
-}
-
-/*
- * sysfs attributes
- */
-
-static ssize_t
-buffer_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct ctc_priv *priv;
-
- priv = dev->driver_data;
- if (!priv)
- return -ENODEV;
- return sprintf(buf, "%d\n",
- priv->buffer_size);
-}
-
-static ssize_t
-buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- struct ctc_priv *priv;
- struct net_device *ndev;
- int bs1;
- char buffer[16];
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- DBF_TEXT(trace, 3, buf);
- priv = dev->driver_data;
- if (!priv) {
- DBF_TEXT(trace, 3, "bfnopriv");
- return -ENODEV;
- }
-
- sscanf(buf, "%u", &bs1);
- if (bs1 > CTC_BUFSIZE_LIMIT)
- goto einval;
- if (bs1 < (576 + LL_HEADER_LENGTH + 2))
- goto einval;
- priv->buffer_size = bs1; // just to overwrite the default
-
- ndev = priv->channel[READ]->netdev;
- if (!ndev) {
- DBF_TEXT(trace, 3, "bfnondev");
- return -ENODEV;
- }
-
- if ((ndev->flags & IFF_RUNNING) &&
- (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
- goto einval;
-
- priv->channel[READ]->max_bufsize = bs1;
- priv->channel[WRITE]->max_bufsize = bs1;
- if (!(ndev->flags & IFF_RUNNING))
- ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
- priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
- priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
-
- sprintf(buffer, "%d",priv->buffer_size);
- DBF_TEXT(trace, 3, buffer);
- return count;
-
-einval:
- DBF_TEXT(trace, 3, "buff_err");
- return -EINVAL;
-}
-
-static ssize_t
-loglevel_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- return sprintf(buf, "%d\n", loglevel);
-}
-
-static ssize_t
-loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- int ll1;
-
- DBF_TEXT(trace, 5, __FUNCTION__);
- sscanf(buf, "%i", &ll1);
-
- if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0))
- return -EINVAL;
- loglevel = ll1;
- return count;
-}
-
-static void
-ctc_print_statistics(struct ctc_priv *priv)
-{
- char *sbuf;
- char *p;
-
- DBF_TEXT(trace, 4, __FUNCTION__);
- if (!priv)
- return;
- sbuf = kmalloc(2048, GFP_KERNEL);
- if (sbuf == NULL)
- return;
- p = sbuf;
-
- p += sprintf(p, " Device FSM state: %s\n",
- fsm_getstate_str(priv->fsm));
- p += sprintf(p, " RX channel FSM state: %s\n",
- fsm_getstate_str(priv->channel[READ]->fsm));
- p += sprintf(p, " TX channel FSM state: %s\n",
- fsm_getstate_str(priv->channel[WRITE]->fsm));
- p += sprintf(p, " Max. TX buffer used: %ld\n",
- priv->channel[WRITE]->prof.maxmulti);
- p += sprintf(p, " Max. chained SKBs: %ld\n",
- priv->channel[WRITE]->prof.maxcqueue);
- p += sprintf(p, " TX single write ops: %ld\n",
- priv->channel[WRITE]->prof.doios_single);
- p += sprintf(p, " TX multi write ops: %ld\n",
- priv->channel[WRITE]->prof.doios_multi);
- p += sprintf(p, " Netto bytes written: %ld\n",
- priv->channel[WRITE]->prof.txlen);
- p += sprintf(p, " Max. TX IO-time: %ld\n",
- priv->channel[WRITE]->prof.tx_time);
-
- ctc_pr_debug("Statistics for %s:\n%s",
- priv->channel[WRITE]->netdev->name, sbuf);
- kfree(sbuf);
- return;
-}
-
-static ssize_t
-stats_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct ctc_priv *priv = dev->driver_data;
- if (!priv)
- return -ENODEV;
- ctc_print_statistics(priv);
- return sprintf(buf, "0\n");
-}
-
-static ssize_t
-stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- struct ctc_priv *priv = dev->driver_data;
- if (!priv)
- return -ENODEV;
- /* Reset statistics */
- memset(&priv->channel[WRITE]->prof, 0,
- sizeof(priv->channel[WRITE]->prof));
- return count;
-}
-
-static void
-ctc_netdev_unregister(struct net_device * dev)
-{
- struct ctc_priv *privptr;
-
- if (!dev)
- return;
- privptr = (struct ctc_priv *) dev->priv;
- unregister_netdev(dev);
-}
-
-static int
-ctc_netdev_register(struct net_device * dev)
-{
- return register_netdev(dev);
-}
-
-static void
-ctc_free_netdevice(struct net_device * dev, int free_dev)
-{
- struct ctc_priv *privptr;
- if (!dev)
- return;
- privptr = dev->priv;
- if (privptr) {
- if (privptr->fsm)
- kfree_fsm(privptr->fsm);
- kfree(privptr);
- }
-#ifdef MODULE
- if (free_dev)
- free_netdev(dev);
-#endif
-}
-
-static ssize_t
-ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct ctc_priv *priv;
-
- priv = dev->driver_data;
- if (!priv)
- return -ENODEV;
-
- return sprintf(buf, "%d\n", priv->protocol);
-}
-
-static ssize_t
-ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
- struct ctc_priv *priv;
- int value;
-
- DBF_TEXT(trace, 3, __FUNCTION__);
- pr_debug("%s() called\n", __FUNCTION__);
-
- priv = dev->driver_data;
- if (!priv)
- return -ENODEV;
- sscanf(buf, "%u", &value);
- if (!((value == CTC_PROTO_S390) ||
- (value == CTC_PROTO_LINUX) ||
- (value == CTC_PROTO_OS390)))
- return -EINVAL;
- priv->protocol = value;
-
- return count;
-}
-
-static ssize_t
-ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct ccwgroup_device *cgdev;
-
- cgdev = to_ccwgroupdev(dev);
- if (!cgdev)
- return -ENODEV;
-
- return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
-}
-
-static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
-static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store);
-static DEVICE_ATTR(type, 0444, ctc_type_show, NULL);
-
-static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write);
-static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
-
-static struct attribute *ctc_attr[] = {
- &dev_attr_protocol.attr,
- &dev_attr_type.attr,
- &dev_attr_buffer.attr,
- NULL,
-};
-
-static struct attribute_group ctc_attr_group = {
- .attrs = ctc_attr,
-};
-
-static int
-ctc_add_attributes(struct device *dev)
-{
- int rc;
-
- rc = device_create_file(dev, &dev_attr_loglevel);
- if (rc)
- goto out;
- rc = device_create_file(dev, &dev_attr_stats);
- if (!rc)
- goto out;
- device_remove_file(dev, &dev_attr_loglevel);
-out:
- return rc;
-}
-
-static void
-ctc_remove_attributes(struct device *dev)
-{
- device_remove_file(dev, &dev_attr_stats);
- device_remove_file(dev, &dev_attr_loglevel);
-}
-
-static int
-ctc_add_files(struct device *dev)
-{
- pr_debug("%s() called\n", __FUNCTION__);
-
- return sysfs_create_group(&dev->kobj, &ctc_attr_group);
-}
-
-static void
-ctc_remove_files(struct device *dev)
-{
- pr_debug("%s() called\n", __FUNCTION__);
-
- sysfs_remove_group(&dev->kobj, &ctc_attr_group);
-}
-
-/**
- * Add ctc specific attributes.
- * Add ctc private data.
- *
- * @param cgdev pointer to ccwgroup_device just added
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_probe_device(struct ccwgroup_device *cgdev)
-{
- struct ctc_priv *priv;
- int rc;
- char buffer[16];
-
- pr_debug("%s() called\n", __FUNCTION__);
- DBF_TEXT(setup, 3, __FUNCTION__);
-
- if (!get_device(&cgdev->dev))
- return -ENODEV;
-
- priv = kzalloc(sizeof(struct ctc_priv), GFP_KERNEL);
- if (!priv) {
- ctc_pr_err("%s: Out of memory\n", __func__);
- put_device(&cgdev->dev);
- return -ENOMEM;
- }
-
- rc = ctc_add_files(&cgdev->dev);
- if (rc) {
- kfree(priv);
- put_device(&cgdev->dev);
- return rc;
- }
- priv->buffer_size = CTC_BUFSIZE_DEFAULT;
- cgdev->cdev[0]->handler = ctc_irq_handler;
- cgdev->cdev[1]->handler = ctc_irq_handler;
- cgdev->dev.driver_data = priv;
-
- sprintf(buffer, "%p", priv);
- DBF_TEXT(data, 3, buffer);
-
- sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv));
- DBF_TEXT(data, 3, buffer);
-
- sprintf(buffer, "%p", &channels);
- DBF_TEXT(data, 3, buffer);
-
- sprintf(buffer, "%u", (unsigned int)sizeof(struct channel));
- DBF_TEXT(data, 3, buffer);
-
- return 0;
-}
-
-/**
- * Device setup function called by alloc_netdev().
- *
- * @param dev Device to be setup.
- */
-void ctc_init_netdevice(struct net_device * dev)
-{
- DBF_TEXT(setup, 3, __FUNCTION__);
-
- if (dev->mtu == 0)
- dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
- dev->hard_start_xmit = ctc_tx;
- dev->open = ctc_open;
- dev->stop = ctc_close;
- dev->get_stats = ctc_stats;
- dev->change_mtu = ctc_change_mtu;
- dev->hard_header_len = LL_HEADER_LENGTH + 2;
- dev->addr_len = 0;
- dev->type = ARPHRD_SLIP;
- dev->tx_queue_len = 100;
- dev->flags = IFF_POINTOPOINT | IFF_NOARP;
-}
-
-
-/**
- *
- * Setup an interface.
- *
- * @param cgdev Device to be setup.
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_new_device(struct ccwgroup_device *cgdev)
-{
- char read_id[CTC_ID_SIZE];
- char write_id[CTC_ID_SIZE];
- int direction;
- enum channel_types type;
- struct ctc_priv *privptr;
- struct net_device *dev;
- int ret;
- char buffer[16];
-
- pr_debug("%s() called\n", __FUNCTION__);
- DBF_TEXT(setup, 3, __FUNCTION__);
-
- privptr = cgdev->dev.driver_data;
- if (!privptr)
- return -ENODEV;
-
- sprintf(buffer, "%d", privptr->buffer_size);
- DBF_TEXT(setup, 3, buffer);
-
- type = get_channel_type(&cgdev->cdev[0]->id);
-
- snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id);
- snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id);
-
- if (add_channel(cgdev->cdev[0], type))
- return -ENOMEM;
- if (add_channel(cgdev->cdev[1], type))
- return -ENOMEM;
-
- ret = ccw_device_set_online(cgdev->cdev[0]);
- if (ret != 0) {
- printk(KERN_WARNING
- "ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret);
- }
-
- ret = ccw_device_set_online(cgdev->cdev[1]);
- if (ret != 0) {
- printk(KERN_WARNING
- "ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret);
- }
-
- dev = alloc_netdev(0, "ctc%d", ctc_init_netdevice);
- if (!dev) {
- ctc_pr_warn("ctc_init_netdevice failed\n");
- goto out;
- }
- dev->priv = privptr;
-
- privptr->fsm = init_fsm("ctcdev", dev_state_names,
- dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS,
- dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
- if (privptr->fsm == NULL) {
- free_netdev(dev);
- goto out;
- }
- fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
- fsm_settimer(privptr->fsm, &privptr->restart_timer);
-
- for (direction = READ; direction <= WRITE; direction++) {
- privptr->channel[direction] =
- channel_get(type, direction == READ ? read_id : write_id,
- direction);
- if (privptr->channel[direction] == NULL) {
- if (direction == WRITE)
- channel_free(privptr->channel[READ]);
-
- ctc_free_netdevice(dev, 1);
- goto out;
- }
- privptr->channel[direction]->netdev = dev;
- privptr->channel[direction]->protocol = privptr->protocol;
- privptr->channel[direction]->max_bufsize = privptr->buffer_size;
- }
- /* sysfs magic */
- SET_NETDEV_DEV(dev, &cgdev->dev);
-
- if (ctc_netdev_register(dev) != 0) {
- ctc_free_netdevice(dev, 1);
- goto out;
- }
-
- if (ctc_add_attributes(&cgdev->dev)) {
- ctc_netdev_unregister(dev);
- dev->priv = NULL;
- ctc_free_netdevice(dev, 1);
- goto out;
- }
-
- strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name));
-
- print_banner();
-
- ctc_pr_info("%s: read: %s, write: %s, proto: %d\n",
- dev->name, privptr->channel[READ]->id,
- privptr->channel[WRITE]->id, privptr->protocol);
-
- return 0;
-out:
- ccw_device_set_offline(cgdev->cdev[1]);
- ccw_device_set_offline(cgdev->cdev[0]);
-
- return -ENODEV;
-}
-
-/**
- * Shutdown an interface.
- *
- * @param cgdev Device to be shut down.
- *
- * @returns 0 on success, !0 on failure.
- */
-static int
-ctc_shutdown_device(struct ccwgroup_device *cgdev)
-{
- struct ctc_priv *priv;
- struct net_device *ndev;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
- pr_debug("%s() called\n", __FUNCTION__);
-
-
- priv = cgdev->dev.driver_data;
- ndev = NULL;
- if (!priv)
- return -ENODEV;
-
- if (priv->channel[READ]) {
- ndev = priv->channel[READ]->netdev;
-
- /* Close the device */
- ctc_close(ndev);
- ndev->flags &=~IFF_RUNNING;
-
- ctc_remove_attributes(&cgdev->dev);
-
- channel_free(priv->channel[READ]);
- }
- if (priv->channel[WRITE])
- channel_free(priv->channel[WRITE]);
-
- if (ndev) {
- ctc_netdev_unregister(ndev);
- ndev->priv = NULL;
- ctc_free_netdevice(ndev, 1);
- }
-
- if (priv->fsm)
- kfree_fsm(priv->fsm);
-
- ccw_device_set_offline(cgdev->cdev[1]);
- ccw_device_set_offline(cgdev->cdev[0]);
-
- if (priv->channel[READ])
- channel_remove(priv->channel[READ]);
- if (priv->channel[WRITE])
- channel_remove(priv->channel[WRITE]);
- priv->channel[READ] = priv->channel[WRITE] = NULL;
-
- return 0;
-
-}
-
-static void
-ctc_remove_device(struct ccwgroup_device *cgdev)
-{
- struct ctc_priv *priv;
-
- pr_debug("%s() called\n", __FUNCTION__);
- DBF_TEXT(setup, 3, __FUNCTION__);
-
- priv = cgdev->dev.driver_data;
- if (!priv)
- return;
- if (cgdev->state == CCWGROUP_ONLINE)
- ctc_shutdown_device(cgdev);
- ctc_remove_files(&cgdev->dev);
- cgdev->dev.driver_data = NULL;
- kfree(priv);
- put_device(&cgdev->dev);
-}
-
-static struct ccwgroup_driver ctc_group_driver = {
- .owner = THIS_MODULE,
- .name = "ctc",
- .max_slaves = 2,
- .driver_id = 0xC3E3C3,
- .probe = ctc_probe_device,
- .remove = ctc_remove_device,
- .set_online = ctc_new_device,
- .set_offline = ctc_shutdown_device,
-};
-
-/**
- * Module related routines
- *****************************************************************************/
-
-/**
- * Prepare to be unloaded. Free IRQ's and release all resources.
- * This is called just before this module is unloaded. It is
- * <em>not</em> called, if the usage count is !0, so we don't need to check
- * for that.
- */
-static void __exit
-ctc_exit(void)
-{
- DBF_TEXT(setup, 3, __FUNCTION__);
- unregister_cu3088_discipline(&ctc_group_driver);
- ctc_unregister_dbf_views();
- ctc_pr_info("CTC driver unloaded\n");
-}
-
-/**
- * Initialize module.
- * This is called just after the module is loaded.
- *
- * @return 0 on success, !0 on error.
- */
-static int __init
-ctc_init(void)
-{
- int ret = 0;
-
- loglevel = CTC_LOGLEVEL_DEFAULT;
-
- DBF_TEXT(setup, 3, __FUNCTION__);
-
- print_banner();
-
- ret = ctc_register_dbf_views();
- if (ret){
- ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret);
- return ret;
- }
- ret = register_cu3088_discipline(&ctc_group_driver);
- if (ret) {
- ctc_unregister_dbf_views();
- }
- return ret;
-}
-
-module_init(ctc_init);
-module_exit(ctc_exit);
-
-/* --- This is the END my friend --- */
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff