Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/s390/net/ctcmain.c b/drivers/s390/net/ctcmain.c
new file mode 100644
index 0000000..7266bf5
--- /dev/null
+++ b/drivers/s390/net/ctcmain.c
@@ -0,0 +1,3304 @@
+/*
+ * $Id: ctcmain.c,v 1.72 2005/03/17 10:51:52 ptiedem Exp $
+ *
+ * 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 <cohuck@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.
+ *
+ * RELEASE-TAG: CTC/ESCON network driver $Revision: 1.72 $
+ *
+ */
+
+#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/sched.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 "ctctty.h"
+#include "fsm.h"
+#include "cu3088.h"
+#include "ctcdbug.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");
+
+/**
+ * CCW commands, used in this driver.
+ */
+#define CCW_CMD_WRITE 0x01
+#define CCW_CMD_READ 0x02
+#define CCW_CMD_SET_EXTENDED 0xc3
+#define CCW_CMD_PREPARE 0xe3
+
+#define CTC_PROTO_S390 0
+#define CTC_PROTO_LINUX 1
+#define CTC_PROTO_LINUX_TTY 2
+#define CTC_PROTO_OS390 3
+#define CTC_PROTO_MAX 3
+
+#define CTC_BUFSIZE_LIMIT 65535
+#define CTC_BUFSIZE_DEFAULT 32768
+
+#define CTC_TIMEOUT_5SEC 5000
+
+#define CTC_INITIAL_BLOCKLEN 2
+
+#define READ 0
+#define WRITE 1
+
+#define CTC_ID_SIZE BUS_ID_SIZE+3
+
+
+struct ctc_profile {
+ unsigned long maxmulti;
+ unsigned long maxcqueue;
+ unsigned long doios_single;
+ unsigned long doios_multi;
+ unsigned long txlen;
+ unsigned long tx_time;
+ struct timespec send_stamp;
+};
+
+/**
+ * Definition of one channel
+ */
+struct channel {
+
+ /**
+ * Pointer to next channel in list.
+ */
+ struct channel *next;
+ char id[CTC_ID_SIZE];
+ struct ccw_device *cdev;
+
+ /**
+ * Type of this channel.
+ * CTC/A or Escon for valid channels.
+ */
+ enum channel_types type;
+
+ /**
+ * Misc. flags. See CHANNEL_FLAGS_... below
+ */
+ __u32 flags;
+
+ /**
+ * The protocol of this channel
+ */
+ __u16 protocol;
+
+ /**
+ * I/O and irq related stuff
+ */
+ struct ccw1 *ccw;
+ struct irb *irb;
+
+ /**
+ * RX/TX buffer size
+ */
+ int max_bufsize;
+
+ /**
+ * Transmit/Receive buffer.
+ */
+ struct sk_buff *trans_skb;
+
+ /**
+ * Universal I/O queue.
+ */
+ struct sk_buff_head io_queue;
+
+ /**
+ * TX queue for collecting skb's during busy.
+ */
+ struct sk_buff_head collect_queue;
+
+ /**
+ * Amount of data in collect_queue.
+ */
+ int collect_len;
+
+ /**
+ * spinlock for collect_queue and collect_len
+ */
+ spinlock_t collect_lock;
+
+ /**
+ * Timer for detecting unresposive
+ * I/O operations.
+ */
+ fsm_timer timer;
+
+ /**
+ * Retry counter for misc. operations.
+ */
+ int retry;
+
+ /**
+ * The finite state machine of this channel
+ */
+ fsm_instance *fsm;
+
+ /**
+ * The corresponding net_device this channel
+ * belongs to.
+ */
+ struct net_device *netdev;
+
+ struct ctc_profile prof;
+
+ unsigned char *trans_skb_data;
+
+ __u16 logflags;
+};
+
+#define CHANNEL_FLAGS_READ 0
+#define CHANNEL_FLAGS_WRITE 1
+#define CHANNEL_FLAGS_INUSE 2
+#define CHANNEL_FLAGS_BUFSIZE_CHANGED 4
+#define CHANNEL_FLAGS_FAILED 8
+#define CHANNEL_FLAGS_WAITIRQ 16
+#define CHANNEL_FLAGS_RWMASK 1
+#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
+
+#define LOG_FLAG_ILLEGALPKT 1
+#define LOG_FLAG_ILLEGALSIZE 2
+#define LOG_FLAG_OVERRUN 4
+#define LOG_FLAG_NOMEM 8
+
+#define CTC_LOGLEVEL_INFO 1
+#define CTC_LOGLEVEL_NOTICE 2
+#define CTC_LOGLEVEL_WARN 4
+#define CTC_LOGLEVEL_EMERG 8
+#define CTC_LOGLEVEL_ERR 16
+#define CTC_LOGLEVEL_DEBUG 32
+#define CTC_LOGLEVEL_CRIT 64
+
+#define CTC_LOGLEVEL_DEFAULT \
+(CTC_LOGLEVEL_INFO | CTC_LOGLEVEL_NOTICE | CTC_LOGLEVEL_WARN | CTC_LOGLEVEL_CRIT)
+
+#define CTC_LOGLEVEL_MAX ((CTC_LOGLEVEL_CRIT<<1)-1)
+
+static int loglevel = CTC_LOGLEVEL_DEFAULT;
+
+#define ctc_pr_debug(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_DEBUG) printk(KERN_DEBUG fmt,##arg); } while (0)
+
+#define ctc_pr_info(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_INFO) printk(KERN_INFO fmt,##arg); } while (0)
+
+#define ctc_pr_notice(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_NOTICE) printk(KERN_NOTICE fmt,##arg); } while (0)
+
+#define ctc_pr_warn(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_WARN) printk(KERN_WARNING fmt,##arg); } while (0)
+
+#define ctc_pr_emerg(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_EMERG) printk(KERN_EMERG fmt,##arg); } while (0)
+
+#define ctc_pr_err(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_ERR) printk(KERN_ERR fmt,##arg); } while (0)
+
+#define ctc_pr_crit(fmt, arg...) \
+do { if (loglevel & CTC_LOGLEVEL_CRIT) printk(KERN_CRIT fmt,##arg); } while (0)
+
+/**
+ * Linked list of all detected channels.
+ */
+static struct channel *channels = NULL;
+
+struct ctc_priv {
+ struct net_device_stats stats;
+ unsigned long tbusy;
+ /**
+ * The finite state machine of this interface.
+ */
+ fsm_instance *fsm;
+ /**
+ * The protocol of this device
+ */
+ __u16 protocol;
+ /**
+ * Timer for restarting after I/O Errors
+ */
+ fsm_timer restart_timer;
+
+ int buffer_size;
+
+ struct channel *channel[2];
+};
+
+/**
+ * Definition of our link level header.
+ */
+struct ll_header {
+ __u16 length;
+ __u16 type;
+ __u16 unused;
+};
+#define LL_HEADER_LENGTH (sizeof(struct ll_header))
+
+/**
+ * Compatibility macros for busy handling
+ * of network devices.
+ */
+static __inline__ void
+ctc_clear_busy(struct net_device * dev)
+{
+ clear_bit(0, &(((struct ctc_priv *) dev->priv)->tbusy));
+ if (((struct ctc_priv *)dev->priv)->protocol != CTC_PROTO_LINUX_TTY)
+ netif_wake_queue(dev);
+}
+
+static __inline__ int
+ctc_test_and_set_busy(struct net_device * dev)
+{
+ if (((struct ctc_priv *)dev->priv)->protocol != CTC_PROTO_LINUX_TTY)
+ netif_stop_queue(dev);
+ return test_and_set_bit(0, &((struct ctc_priv *) dev->priv)->tbusy);
+}
+
+/**
+ * Print Banner.
+ */
+static void
+print_banner(void)
+{
+ static int printed = 0;
+ char vbuf[] = "$Revision: 1.72 $";
+ char *version = vbuf;
+
+ if (printed)
+ return;
+ if ((version = strchr(version, ':'))) {
+ char *p = strchr(version + 1, '$');
+ if (p)
+ *p = '\0';
+ } else
+ version = " ??? ";
+ printk(KERN_INFO "CTC driver Version%s"
+#ifdef DEBUG
+ " (DEBUG-VERSION, " __DATE__ __TIME__ ")"
+#endif
+ " initialized\n", version);
+ 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;
+}
+
+/**
+ * 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!!
+ */
+ 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!!
+ */
+ 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,
+};
+
+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",
+};
+
+/**
+ * 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 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 __inline__ 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);
+ pskb->mac.raw = pskb->data;
+ 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;
+ }
+ memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len);
+ skb->mac.raw = skb->data;
+ skb->dev = pskb->dev;
+ skb->protocol = pskb->protocol;
+ pskb->ip_summed = CHECKSUM_UNNECESSARY;
+ if (ch->protocol == CTC_PROTO_LINUX_TTY)
+ ctc_tty_netif_rx(skb);
+ else
+ netif_rx_ni(skb);
+ /**
+ * Successful rx; reset logflags
+ */
+ ch->logflags = 0;
+ dev->last_rx = jiffies;
+ privptr->stats.rx_packets++;
+ privptr->stats.rx_bytes += skb->len;
+ 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 inline
+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 inline
+ccw_unit_check(struct channel *ch, unsigned char sense)
+{
+ DBF_TEXT(trace, 5, __FUNCTION__);
+ if (sense & SNS0_INTERVENTION_REQ) {
+ if (sense & 0x01) {
+ if (ch->protocol != CTC_PROTO_LINUX_TTY)
+ 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 __inline__ 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 = xtime;
+
+ 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->tail = ch->trans_skb->data = ch->trans_skb_data;
+ 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))) {
+ memcpy(skb_put(ch->trans_skb, skb->len), skb->data,
+ 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 = xtime;
+ 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 = skb->tail = ch->trans_skb_data;
+ 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__);
+ if ((ch =
+ (struct channel *) kmalloc(sizeof (struct channel),
+ GFP_KERNEL)) == NULL) {
+ ctc_pr_warn("ctc: Out of memory in add_channel\n");
+ return -1;
+ }
+ memset(ch, 0, sizeof (struct channel));
+ if ((ch->ccw = (struct ccw1 *) kmalloc(8*sizeof(struct ccw1),
+ GFP_KERNEL | GFP_DMA)) == NULL) {
+ kfree(ch);
+ ctc_pr_warn("ctc: Out of memory in add_channel\n");
+ return -1;
+ }
+
+ memset(ch->ccw, 0, 8*sizeof(struct ccw1)); // assure all flags and counters are reset
+
+ /**
+ * "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;
+ loglevel = CTC_LOGLEVEL_DEFAULT;
+ 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);
+ if ((ch->irb = (struct irb *) kmalloc(sizeof (struct irb),
+ GFP_KERNEL)) == NULL) {
+ ctc_pr_warn("ctc: Out of memory in add_channel\n");
+ kfree_fsm(ch->fsm);
+ kfree(ch->ccw);
+ kfree(ch);
+ return -1;
+ }
+ memset(ch->irb, 0, sizeof (struct irb));
+ 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;
+ }
+ 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;
+ struct ctc_priv *privptr = dev->priv;
+
+ 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);
+ if (privptr->protocol == CTC_PROTO_LINUX_TTY)
+ ctc_tty_setcarrier(dev, 1);
+ 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);
+ if (privptr->protocol == CTC_PROTO_LINUX_TTY)
+ ctc_tty_setcarrier(dev, 1);
+ 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)
+{
+ struct net_device *dev = (struct net_device *) arg;
+ struct ctc_priv *privptr = dev->priv;
+
+ DBF_TEXT(trace, 3, __FUNCTION__);
+ switch (fsm_getstate(fi)) {
+ case DEV_STATE_RUNNING:
+ if (privptr->protocol == CTC_PROTO_LINUX_TTY)
+ ctc_tty_setcarrier(dev, 0);
+ 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__);
+ if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) {
+ int l = skb->len + LL_HEADER_LENGTH;
+
+ spin_lock_irqsave(&ch->collect_lock, saveflags);
+ if (ch->collect_len + l > ch->max_bufsize - 2)
+ rc = -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;
+
+ /**
+ * 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 + 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);
+ 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);
+ return -EBUSY;
+ }
+
+ ch->trans_skb->tail = ch->trans_skb->data;
+ ch->trans_skb->len = 0;
+ ch->ccw[1].count = skb->len;
+ memcpy(skb_put(ch->trans_skb, skb->len), skb->data,
+ 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 = xtime;
+ 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;
+ }
+ }
+ }
+
+ 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);
+ if (privptr->protocol == CTC_PROTO_LINUX_TTY)
+ return -EBUSY;
+ 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;
+ ctc_clear_busy(dev);
+ 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, 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, const char *buf, size_t count)
+{
+ struct ctc_priv *priv;
+ struct net_device *ndev;
+ int bs1;
+
+ DBF_TEXT(trace, 3, __FUNCTION__);
+ priv = dev->driver_data;
+ if (!priv)
+ return -ENODEV;
+ ndev = priv->channel[READ]->netdev;
+ if (!ndev)
+ return -ENODEV;
+ sscanf(buf, "%u", &bs1);
+
+ if (bs1 > CTC_BUFSIZE_LIMIT)
+ return -EINVAL;
+ if ((ndev->flags & IFF_RUNNING) &&
+ (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
+ return -EINVAL;
+ if (bs1 < (576 + LL_HEADER_LENGTH + 2))
+ return -EINVAL;
+
+ priv->buffer_size = bs1;
+ priv->channel[READ]->max_bufsize =
+ 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;
+
+ return count;
+
+}
+
+static ssize_t
+loglevel_show(struct device *dev, char *buf)
+{
+ struct ctc_priv *priv;
+
+ priv = dev->driver_data;
+ if (!priv)
+ return -ENODEV;
+ return sprintf(buf, "%d\n", loglevel);
+}
+
+static ssize_t
+loglevel_write(struct device *dev, const char *buf, size_t count)
+{
+ struct ctc_priv *priv;
+ int ll1;
+
+ DBF_TEXT(trace, 5, __FUNCTION__);
+ priv = dev->driver_data;
+ if (!priv)
+ return -ENODEV;
+ 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 = (char *)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, 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, 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 DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
+static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write);
+static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
+
+static int
+ctc_add_attributes(struct device *dev)
+{
+// device_create_file(dev, &dev_attr_buffer);
+ device_create_file(dev, &dev_attr_loglevel);
+ device_create_file(dev, &dev_attr_stats);
+ return 0;
+}
+
+static void
+ctc_remove_attributes(struct device *dev)
+{
+ device_remove_file(dev, &dev_attr_stats);
+ device_remove_file(dev, &dev_attr_loglevel);
+// device_remove_file(dev, &dev_attr_buffer);
+}
+
+
+static void
+ctc_netdev_unregister(struct net_device * dev)
+{
+ struct ctc_priv *privptr;
+
+ if (!dev)
+ return;
+ privptr = (struct ctc_priv *) dev->priv;
+ if (privptr->protocol != CTC_PROTO_LINUX_TTY)
+ unregister_netdev(dev);
+ else
+ ctc_tty_unregister_netdev(dev);
+}
+
+static int
+ctc_netdev_register(struct net_device * dev)
+{
+ struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
+ if (privptr->protocol != CTC_PROTO_LINUX_TTY)
+ return register_netdev(dev);
+ else
+ return ctc_tty_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
+}
+
+/**
+ * Initialize everything of the net device except the name and the
+ * channel structs.
+ */
+static struct net_device *
+ctc_init_netdevice(struct net_device * dev, int alloc_device,
+ struct ctc_priv *privptr)
+{
+ if (!privptr)
+ return NULL;
+
+ DBF_TEXT(setup, 3, __FUNCTION__);
+ if (alloc_device) {
+ dev = kmalloc(sizeof (struct net_device), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+ memset(dev, 0, sizeof (struct net_device));
+ }
+
+ dev->priv = privptr;
+ privptr->fsm = init_fsm("ctcdev", dev_state_names,
+ dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS,
+ dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
+ if (privptr->fsm == NULL) {
+ if (alloc_device)
+ kfree(dev);
+ return NULL;
+ }
+ fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
+ fsm_settimer(privptr->fsm, &privptr->restart_timer);
+ 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;
+ SET_MODULE_OWNER(dev);
+ return dev;
+}
+
+static ssize_t
+ctc_proto_show(struct device *dev, 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, 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 < 0) || (value > CTC_PROTO_MAX))
+ return -EINVAL;
+ priv->protocol = value;
+
+ return count;
+}
+
+static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store);
+
+static ssize_t
+ctc_type_show(struct device *dev, 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(type, 0444, ctc_type_show, NULL);
+
+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_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;
+
+ pr_debug("%s() called\n", __FUNCTION__);
+ DBF_TEXT(trace, 3, __FUNCTION__);
+
+ if (!get_device(&cgdev->dev))
+ return -ENODEV;
+
+ priv = kmalloc(sizeof (struct ctc_priv), GFP_KERNEL);
+ if (!priv) {
+ ctc_pr_err("%s: Out of memory\n", __func__);
+ put_device(&cgdev->dev);
+ return -ENOMEM;
+ }
+
+ memset(priv, 0, sizeof (struct ctc_priv));
+ 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;
+
+ return 0;
+}
+
+/**
+ *
+ * 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;
+
+ pr_debug("%s() called\n", __FUNCTION__);
+ DBF_TEXT(setup, 3, __FUNCTION__);
+
+ privptr = cgdev->dev.driver_data;
+ if (!privptr)
+ return -ENODEV;
+
+ 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 = ctc_init_netdevice(NULL, 1, privptr);
+
+ if (!dev) {
+ ctc_pr_warn("ctc_init_netdevice failed\n");
+ goto out;
+ }
+
+ if (privptr->protocol == CTC_PROTO_LINUX_TTY)
+ strlcpy(dev->name, "ctctty%d", IFNAMSIZ);
+ else
+ strlcpy(dev->name, "ctc%d", IFNAMSIZ);
+
+ 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;
+ }
+
+ ctc_add_attributes(&cgdev->dev);
+
+ 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(trace, 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(trace, 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)
+{
+ unregister_cu3088_discipline(&ctc_group_driver);
+ ctc_tty_cleanup();
+ 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;
+
+ 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;
+ }
+ ctc_tty_init();
+ ret = register_cu3088_discipline(&ctc_group_driver);
+ if (ret) {
+ ctc_tty_cleanup();
+ ctc_unregister_dbf_views();
+ }
+ return ret;
+}
+
+module_init(ctc_init);
+module_exit(ctc_exit);
+
+/* --- This is the END my friend --- */