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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright IBM Corp. 2001, 2009
0004  * Author(s):
0005  *  Original CTC driver(s):
0006  *      Fritz Elfert (felfert@millenux.com)
0007  *      Dieter Wellerdiek (wel@de.ibm.com)
0008  *      Martin Schwidefsky (schwidefsky@de.ibm.com)
0009  *      Denis Joseph Barrow (barrow_dj@yahoo.com)
0010  *      Jochen Roehrig (roehrig@de.ibm.com)
0011  *      Cornelia Huck <cornelia.huck@de.ibm.com>
0012  *  MPC additions:
0013  *      Belinda Thompson (belindat@us.ibm.com)
0014  *      Andy Richter (richtera@us.ibm.com)
0015  *  Revived by:
0016  *      Peter Tiedemann (ptiedem@de.ibm.com)
0017  */
0018 
0019 #undef DEBUG
0020 #undef DEBUGDATA
0021 #undef DEBUGCCW
0022 
0023 #define KMSG_COMPONENT "ctcm"
0024 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0025 
0026 #include <linux/module.h>
0027 #include <linux/init.h>
0028 #include <linux/kernel.h>
0029 #include <linux/slab.h>
0030 #include <linux/errno.h>
0031 #include <linux/types.h>
0032 #include <linux/interrupt.h>
0033 #include <linux/timer.h>
0034 #include <linux/bitops.h>
0035 
0036 #include <linux/signal.h>
0037 #include <linux/string.h>
0038 
0039 #include <linux/ip.h>
0040 #include <linux/if_arp.h>
0041 #include <linux/tcp.h>
0042 #include <linux/skbuff.h>
0043 #include <linux/ctype.h>
0044 #include <net/dst.h>
0045 
0046 #include <linux/io.h>
0047 #include <asm/ccwdev.h>
0048 #include <asm/ccwgroup.h>
0049 #include <linux/uaccess.h>
0050 
0051 #include <asm/idals.h>
0052 
0053 #include "ctcm_fsms.h"
0054 #include "ctcm_main.h"
0055 
0056 /* Some common global variables */
0057 
0058 /*
0059  * The root device for ctcm group devices
0060  */
0061 static struct device *ctcm_root_dev;
0062 
0063 /*
0064  * Linked list of all detected channels.
0065  */
0066 struct channel *channels;
0067 
0068 /*
0069  * Unpack a just received skb and hand it over to
0070  * upper layers.
0071  *
0072  *  ch      The channel where this skb has been received.
0073  *  pskb    The received skb.
0074  */
0075 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
0076 {
0077     struct net_device *dev = ch->netdev;
0078     struct ctcm_priv *priv = dev->ml_priv;
0079     __u16 len = *((__u16 *) pskb->data);
0080 
0081     skb_put(pskb, 2 + LL_HEADER_LENGTH);
0082     skb_pull(pskb, 2);
0083     pskb->dev = dev;
0084     pskb->ip_summed = CHECKSUM_UNNECESSARY;
0085     while (len > 0) {
0086         struct sk_buff *skb;
0087         int skblen;
0088         struct ll_header *header = (struct ll_header *)pskb->data;
0089 
0090         skb_pull(pskb, LL_HEADER_LENGTH);
0091         if ((ch->protocol == CTCM_PROTO_S390) &&
0092             (header->type != ETH_P_IP)) {
0093             if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
0094                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
0095                 /*
0096                  * Check packet type only if we stick strictly
0097                  * to S/390's protocol of OS390. This only
0098                  * supports IP. Otherwise allow any packet
0099                  * type.
0100                  */
0101                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0102                     "%s(%s): Illegal packet type 0x%04x"
0103                     " - dropping",
0104                     CTCM_FUNTAIL, dev->name, header->type);
0105             }
0106             priv->stats.rx_dropped++;
0107             priv->stats.rx_frame_errors++;
0108             return;
0109         }
0110         pskb->protocol = cpu_to_be16(header->type);
0111         if ((header->length <= LL_HEADER_LENGTH) ||
0112             (len <= LL_HEADER_LENGTH)) {
0113             if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
0114                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0115                     "%s(%s): Illegal packet size %d(%d,%d)"
0116                     "- dropping",
0117                     CTCM_FUNTAIL, dev->name,
0118                     header->length, dev->mtu, len);
0119                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
0120             }
0121 
0122             priv->stats.rx_dropped++;
0123             priv->stats.rx_length_errors++;
0124             return;
0125         }
0126         header->length -= LL_HEADER_LENGTH;
0127         len -= LL_HEADER_LENGTH;
0128         if ((header->length > skb_tailroom(pskb)) ||
0129             (header->length > len)) {
0130             if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
0131                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0132                     "%s(%s): Packet size %d (overrun)"
0133                     " - dropping", CTCM_FUNTAIL,
0134                         dev->name, header->length);
0135                 ch->logflags |= LOG_FLAG_OVERRUN;
0136             }
0137 
0138             priv->stats.rx_dropped++;
0139             priv->stats.rx_length_errors++;
0140             return;
0141         }
0142         skb_put(pskb, header->length);
0143         skb_reset_mac_header(pskb);
0144         len -= header->length;
0145         skb = dev_alloc_skb(pskb->len);
0146         if (!skb) {
0147             if (!(ch->logflags & LOG_FLAG_NOMEM)) {
0148                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0149                     "%s(%s): MEMORY allocation error",
0150                         CTCM_FUNTAIL, dev->name);
0151                 ch->logflags |= LOG_FLAG_NOMEM;
0152             }
0153             priv->stats.rx_dropped++;
0154             return;
0155         }
0156         skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
0157                       pskb->len);
0158         skb_reset_mac_header(skb);
0159         skb->dev = pskb->dev;
0160         skb->protocol = pskb->protocol;
0161         pskb->ip_summed = CHECKSUM_UNNECESSARY;
0162         skblen = skb->len;
0163         /*
0164          * reset logflags
0165          */
0166         ch->logflags = 0;
0167         priv->stats.rx_packets++;
0168         priv->stats.rx_bytes += skblen;
0169         netif_rx(skb);
0170         if (len > 0) {
0171             skb_pull(pskb, header->length);
0172             if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
0173                 CTCM_DBF_DEV_NAME(TRACE, dev,
0174                     "Overrun in ctcm_unpack_skb");
0175                 ch->logflags |= LOG_FLAG_OVERRUN;
0176                 return;
0177             }
0178             skb_put(pskb, LL_HEADER_LENGTH);
0179         }
0180     }
0181 }
0182 
0183 /*
0184  * Release a specific channel in the channel list.
0185  *
0186  *  ch      Pointer to channel struct to be released.
0187  */
0188 static void channel_free(struct channel *ch)
0189 {
0190     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
0191     ch->flags &= ~CHANNEL_FLAGS_INUSE;
0192     fsm_newstate(ch->fsm, CTC_STATE_IDLE);
0193 }
0194 
0195 /*
0196  * Remove a specific channel in the channel list.
0197  *
0198  *  ch      Pointer to channel struct to be released.
0199  */
0200 static void channel_remove(struct channel *ch)
0201 {
0202     struct channel **c = &channels;
0203     char chid[CTCM_ID_SIZE+1];
0204     int ok = 0;
0205 
0206     if (ch == NULL)
0207         return;
0208     else
0209         strncpy(chid, ch->id, CTCM_ID_SIZE);
0210 
0211     channel_free(ch);
0212     while (*c) {
0213         if (*c == ch) {
0214             *c = ch->next;
0215             fsm_deltimer(&ch->timer);
0216             if (IS_MPC(ch))
0217                 fsm_deltimer(&ch->sweep_timer);
0218 
0219             kfree_fsm(ch->fsm);
0220             clear_normalized_cda(&ch->ccw[4]);
0221             if (ch->trans_skb != NULL) {
0222                 clear_normalized_cda(&ch->ccw[1]);
0223                 dev_kfree_skb_any(ch->trans_skb);
0224             }
0225             if (IS_MPC(ch)) {
0226                 tasklet_kill(&ch->ch_tasklet);
0227                 tasklet_kill(&ch->ch_disc_tasklet);
0228                 kfree(ch->discontact_th);
0229             }
0230             kfree(ch->ccw);
0231             kfree(ch->irb);
0232             kfree(ch);
0233             ok = 1;
0234             break;
0235         }
0236         c = &((*c)->next);
0237     }
0238 
0239     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
0240             chid, ok ? "OK" : "failed");
0241 }
0242 
0243 /*
0244  * Get a specific channel from the channel list.
0245  *
0246  *  type    Type of channel we are interested in.
0247  *  id      Id of channel we are interested in.
0248  *  direction   Direction we want to use this channel for.
0249  *
0250  * returns Pointer to a channel or NULL if no matching channel available.
0251  */
0252 static struct channel *channel_get(enum ctcm_channel_types type,
0253                     char *id, int direction)
0254 {
0255     struct channel *ch = channels;
0256 
0257     while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
0258         ch = ch->next;
0259     if (!ch) {
0260         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0261                 "%s(%d, %s, %d) not found in channel list\n",
0262                 CTCM_FUNTAIL, type, id, direction);
0263     } else {
0264         if (ch->flags & CHANNEL_FLAGS_INUSE)
0265             ch = NULL;
0266         else {
0267             ch->flags |= CHANNEL_FLAGS_INUSE;
0268             ch->flags &= ~CHANNEL_FLAGS_RWMASK;
0269             ch->flags |= (direction == CTCM_WRITE)
0270                 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
0271             fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
0272         }
0273     }
0274     return ch;
0275 }
0276 
0277 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
0278 {
0279     if (!IS_ERR(irb))
0280         return 0;
0281 
0282     CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
0283             "irb error %ld on device %s\n",
0284                 PTR_ERR(irb), dev_name(&cdev->dev));
0285 
0286     switch (PTR_ERR(irb)) {
0287     case -EIO:
0288         dev_err(&cdev->dev,
0289             "An I/O-error occurred on the CTCM device\n");
0290         break;
0291     case -ETIMEDOUT:
0292         dev_err(&cdev->dev,
0293             "An adapter hardware operation timed out\n");
0294         break;
0295     default:
0296         dev_err(&cdev->dev,
0297             "An error occurred on the adapter hardware\n");
0298     }
0299     return PTR_ERR(irb);
0300 }
0301 
0302 
0303 /*
0304  * Check sense of a unit check.
0305  *
0306  *  ch      The channel, the sense code belongs to.
0307  *  sense   The sense code to inspect.
0308  */
0309 static void ccw_unit_check(struct channel *ch, __u8 sense)
0310 {
0311     CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
0312             "%s(%s): %02x",
0313                 CTCM_FUNTAIL, ch->id, sense);
0314 
0315     if (sense & SNS0_INTERVENTION_REQ) {
0316         if (sense & 0x01) {
0317             if (ch->sense_rc != 0x01) {
0318                 pr_notice(
0319                     "%s: The communication peer has "
0320                     "disconnected\n", ch->id);
0321                 ch->sense_rc = 0x01;
0322             }
0323             fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
0324         } else {
0325             if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
0326                 pr_notice(
0327                     "%s: The remote operating system is "
0328                     "not available\n", ch->id);
0329                 ch->sense_rc = SNS0_INTERVENTION_REQ;
0330             }
0331             fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
0332         }
0333     } else if (sense & SNS0_EQUIPMENT_CHECK) {
0334         if (sense & SNS0_BUS_OUT_CHECK) {
0335             if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
0336                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0337                     "%s(%s): remote HW error %02x",
0338                         CTCM_FUNTAIL, ch->id, sense);
0339                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
0340             }
0341             fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
0342         } else {
0343             if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
0344                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0345                     "%s(%s): remote read parity error %02x",
0346                         CTCM_FUNTAIL, ch->id, sense);
0347                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
0348             }
0349             fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
0350         }
0351     } else if (sense & SNS0_BUS_OUT_CHECK) {
0352         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
0353             CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0354                 "%s(%s): BUS OUT error %02x",
0355                     CTCM_FUNTAIL, ch->id, sense);
0356             ch->sense_rc = SNS0_BUS_OUT_CHECK;
0357         }
0358         if (sense & 0x04)   /* data-streaming timeout */
0359             fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
0360         else            /* Data-transfer parity error */
0361             fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
0362     } else if (sense & SNS0_CMD_REJECT) {
0363         if (ch->sense_rc != SNS0_CMD_REJECT) {
0364             CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0365                 "%s(%s): Command rejected",
0366                         CTCM_FUNTAIL, ch->id);
0367             ch->sense_rc = SNS0_CMD_REJECT;
0368         }
0369     } else if (sense == 0) {
0370         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0371             "%s(%s): Unit check ZERO",
0372                     CTCM_FUNTAIL, ch->id);
0373         fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
0374     } else {
0375         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
0376             "%s(%s): Unit check code %02x unknown",
0377                     CTCM_FUNTAIL, ch->id, sense);
0378         fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
0379     }
0380 }
0381 
0382 int ctcm_ch_alloc_buffer(struct channel *ch)
0383 {
0384     clear_normalized_cda(&ch->ccw[1]);
0385     ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
0386     if (ch->trans_skb == NULL) {
0387         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0388             "%s(%s): %s trans_skb allocation error",
0389             CTCM_FUNTAIL, ch->id,
0390             (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
0391                 "RX" : "TX");
0392         return -ENOMEM;
0393     }
0394 
0395     ch->ccw[1].count = ch->max_bufsize;
0396     if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
0397         dev_kfree_skb(ch->trans_skb);
0398         ch->trans_skb = NULL;
0399         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0400             "%s(%s): %s set norm_cda failed",
0401             CTCM_FUNTAIL, ch->id,
0402             (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
0403                 "RX" : "TX");
0404         return -ENOMEM;
0405     }
0406 
0407     ch->ccw[1].count = 0;
0408     ch->trans_skb_data = ch->trans_skb->data;
0409     ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
0410     return 0;
0411 }
0412 
0413 /*
0414  * Interface API for upper network layers
0415  */
0416 
0417 /*
0418  * Open an interface.
0419  * Called from generic network layer when ifconfig up is run.
0420  *
0421  *  dev     Pointer to interface struct.
0422  *
0423  * returns 0 on success, -ERRNO on failure. (Never fails.)
0424  */
0425 int ctcm_open(struct net_device *dev)
0426 {
0427     struct ctcm_priv *priv = dev->ml_priv;
0428 
0429     CTCMY_DBF_DEV_NAME(SETUP, dev, "");
0430     if (!IS_MPC(priv))
0431         fsm_event(priv->fsm,    DEV_EVENT_START, dev);
0432     return 0;
0433 }
0434 
0435 /*
0436  * Close an interface.
0437  * Called from generic network layer when ifconfig down is run.
0438  *
0439  *  dev     Pointer to interface struct.
0440  *
0441  * returns 0 on success, -ERRNO on failure. (Never fails.)
0442  */
0443 int ctcm_close(struct net_device *dev)
0444 {
0445     struct ctcm_priv *priv = dev->ml_priv;
0446 
0447     CTCMY_DBF_DEV_NAME(SETUP, dev, "");
0448     if (!IS_MPC(priv))
0449         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
0450     return 0;
0451 }
0452 
0453 
0454 /*
0455  * Transmit a packet.
0456  * This is a helper function for ctcm_tx().
0457  *
0458  *  ch      Channel to be used for sending.
0459  *  skb     Pointer to struct sk_buff of packet to send.
0460  *            The linklevel header has already been set up
0461  *            by ctcm_tx().
0462  *
0463  * returns 0 on success, -ERRNO on failure. (Never fails.)
0464  */
0465 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
0466 {
0467     unsigned long saveflags;
0468     struct ll_header header;
0469     int rc = 0;
0470     __u16 block_len;
0471     int ccw_idx;
0472     struct sk_buff *nskb;
0473     unsigned long hi;
0474 
0475     /* we need to acquire the lock for testing the state
0476      * otherwise we can have an IRQ changing the state to
0477      * TXIDLE after the test but before acquiring the lock.
0478      */
0479     spin_lock_irqsave(&ch->collect_lock, saveflags);
0480     if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
0481         int l = skb->len + LL_HEADER_LENGTH;
0482 
0483         if (ch->collect_len + l > ch->max_bufsize - 2) {
0484             spin_unlock_irqrestore(&ch->collect_lock, saveflags);
0485             return -EBUSY;
0486         } else {
0487             refcount_inc(&skb->users);
0488             header.length = l;
0489             header.type = be16_to_cpu(skb->protocol);
0490             header.unused = 0;
0491             memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
0492                    LL_HEADER_LENGTH);
0493             skb_queue_tail(&ch->collect_queue, skb);
0494             ch->collect_len += l;
0495         }
0496         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
0497                 goto done;
0498     }
0499     spin_unlock_irqrestore(&ch->collect_lock, saveflags);
0500     /*
0501      * Protect skb against beeing free'd by upper
0502      * layers.
0503      */
0504     refcount_inc(&skb->users);
0505     ch->prof.txlen += skb->len;
0506     header.length = skb->len + LL_HEADER_LENGTH;
0507     header.type = be16_to_cpu(skb->protocol);
0508     header.unused = 0;
0509     memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
0510     block_len = skb->len + 2;
0511     *((__u16 *)skb_push(skb, 2)) = block_len;
0512 
0513     /*
0514      * IDAL support in CTCM is broken, so we have to
0515      * care about skb's above 2G ourselves.
0516      */
0517     hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
0518     if (hi) {
0519         nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
0520         if (!nskb) {
0521             refcount_dec(&skb->users);
0522             skb_pull(skb, LL_HEADER_LENGTH + 2);
0523             ctcm_clear_busy(ch->netdev);
0524             return -ENOMEM;
0525         } else {
0526             skb_put_data(nskb, skb->data, skb->len);
0527             refcount_inc(&nskb->users);
0528             refcount_dec(&skb->users);
0529             dev_kfree_skb_irq(skb);
0530             skb = nskb;
0531         }
0532     }
0533 
0534     ch->ccw[4].count = block_len;
0535     if (set_normalized_cda(&ch->ccw[4], skb->data)) {
0536         /*
0537          * idal allocation failed, try via copying to
0538          * trans_skb. trans_skb usually has a pre-allocated
0539          * idal.
0540          */
0541         if (ctcm_checkalloc_buffer(ch)) {
0542             /*
0543              * Remove our header. It gets added
0544              * again on retransmit.
0545              */
0546             refcount_dec(&skb->users);
0547             skb_pull(skb, LL_HEADER_LENGTH + 2);
0548             ctcm_clear_busy(ch->netdev);
0549             return -ENOMEM;
0550         }
0551 
0552         skb_reset_tail_pointer(ch->trans_skb);
0553         ch->trans_skb->len = 0;
0554         ch->ccw[1].count = skb->len;
0555         skb_copy_from_linear_data(skb,
0556                 skb_put(ch->trans_skb, skb->len), skb->len);
0557         refcount_dec(&skb->users);
0558         dev_kfree_skb_irq(skb);
0559         ccw_idx = 0;
0560     } else {
0561         skb_queue_tail(&ch->io_queue, skb);
0562         ccw_idx = 3;
0563     }
0564     if (do_debug_ccw)
0565         ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
0566                     sizeof(struct ccw1) * 3);
0567     ch->retry = 0;
0568     fsm_newstate(ch->fsm, CTC_STATE_TX);
0569     fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
0570     spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
0571     ch->prof.send_stamp = jiffies;
0572     rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
0573     spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
0574     if (ccw_idx == 3)
0575         ch->prof.doios_single++;
0576     if (rc != 0) {
0577         fsm_deltimer(&ch->timer);
0578         ctcm_ccw_check_rc(ch, rc, "single skb TX");
0579         if (ccw_idx == 3)
0580             skb_dequeue_tail(&ch->io_queue);
0581         /*
0582          * Remove our header. It gets added
0583          * again on retransmit.
0584          */
0585         skb_pull(skb, LL_HEADER_LENGTH + 2);
0586     } else if (ccw_idx == 0) {
0587         struct net_device *dev = ch->netdev;
0588         struct ctcm_priv *priv = dev->ml_priv;
0589         priv->stats.tx_packets++;
0590         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
0591     }
0592 done:
0593     ctcm_clear_busy(ch->netdev);
0594     return rc;
0595 }
0596 
0597 static void ctcmpc_send_sweep_req(struct channel *rch)
0598 {
0599     struct net_device *dev = rch->netdev;
0600     struct ctcm_priv *priv;
0601     struct mpc_group *grp;
0602     struct th_sweep *header;
0603     struct sk_buff *sweep_skb;
0604     struct channel *ch;
0605     /* int rc = 0; */
0606 
0607     priv = dev->ml_priv;
0608     grp = priv->mpcg;
0609     ch = priv->channel[CTCM_WRITE];
0610 
0611     /* sweep processing is not complete until response and request */
0612     /* has completed for all read channels in group            */
0613     if (grp->in_sweep == 0) {
0614         grp->in_sweep = 1;
0615         grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
0616         grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
0617     }
0618 
0619     sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
0620 
0621     if (sweep_skb == NULL)  {
0622         /* rc = -ENOMEM; */
0623                 goto nomem;
0624     }
0625 
0626     header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
0627     header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
0628     header->sw.th_last_seq  = ch->th_seq_num;
0629 
0630     netif_trans_update(dev);
0631     skb_queue_tail(&ch->sweep_queue, sweep_skb);
0632 
0633     fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
0634 
0635     return;
0636 
0637 nomem:
0638     grp->in_sweep = 0;
0639     ctcm_clear_busy(dev);
0640     fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0641 
0642     return;
0643 }
0644 
0645 /*
0646  * MPC mode version of transmit_skb
0647  */
0648 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
0649 {
0650     struct pdu *p_header;
0651     struct net_device *dev = ch->netdev;
0652     struct ctcm_priv *priv = dev->ml_priv;
0653     struct mpc_group *grp = priv->mpcg;
0654     struct th_header *header;
0655     struct sk_buff *nskb;
0656     int rc = 0;
0657     int ccw_idx;
0658     unsigned long hi;
0659     unsigned long saveflags = 0;    /* avoids compiler warning */
0660 
0661     CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
0662             __func__, dev->name, smp_processor_id(), ch,
0663                     ch->id, fsm_getstate_str(ch->fsm));
0664 
0665     if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
0666         spin_lock_irqsave(&ch->collect_lock, saveflags);
0667         refcount_inc(&skb->users);
0668 
0669         p_header = skb_push(skb, PDU_HEADER_LENGTH);
0670         p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
0671         p_header->pdu_proto = 0x01;
0672         if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
0673             p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
0674         } else {
0675             p_header->pdu_flag = PDU_FIRST;
0676         }
0677         p_header->pdu_seq = 0;
0678 
0679         CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
0680                 "pdu header and data for up to 32 bytes:\n",
0681                 __func__, dev->name, skb->len);
0682         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
0683 
0684         skb_queue_tail(&ch->collect_queue, skb);
0685         ch->collect_len += skb->len;
0686 
0687         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
0688             goto done;
0689     }
0690 
0691     /*
0692      * Protect skb against beeing free'd by upper
0693      * layers.
0694      */
0695     refcount_inc(&skb->users);
0696 
0697     /*
0698      * IDAL support in CTCM is broken, so we have to
0699      * care about skb's above 2G ourselves.
0700      */
0701     hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
0702     if (hi) {
0703         nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
0704         if (!nskb) {
0705             goto nomem_exit;
0706         } else {
0707             skb_put_data(nskb, skb->data, skb->len);
0708             refcount_inc(&nskb->users);
0709             refcount_dec(&skb->users);
0710             dev_kfree_skb_irq(skb);
0711             skb = nskb;
0712         }
0713     }
0714 
0715     p_header = skb_push(skb, PDU_HEADER_LENGTH);
0716     p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
0717     p_header->pdu_proto = 0x01;
0718     p_header->pdu_seq = 0;
0719     if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
0720         p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
0721     } else {
0722         p_header->pdu_flag = PDU_FIRST;
0723     }
0724 
0725     if (ch->collect_len > 0) {
0726         spin_lock_irqsave(&ch->collect_lock, saveflags);
0727         skb_queue_tail(&ch->collect_queue, skb);
0728         ch->collect_len += skb->len;
0729         skb = skb_dequeue(&ch->collect_queue);
0730         ch->collect_len -= skb->len;
0731         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
0732     }
0733 
0734     p_header = (struct pdu *)skb->data;
0735     p_header->pdu_flag |= PDU_LAST;
0736 
0737     ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
0738 
0739     /* put the TH on the packet */
0740     header = skb_push(skb, TH_HEADER_LENGTH);
0741     memset(header, 0, TH_HEADER_LENGTH);
0742 
0743     header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
0744     ch->th_seq_num++;
0745     header->th_seq_num = ch->th_seq_num;
0746 
0747     CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
0748                __func__, dev->name, ch->th_seq_num);
0749 
0750     CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
0751             "up to 32 bytes sent to vtam:\n",
0752                 __func__, dev->name, skb->len);
0753     CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
0754 
0755     ch->ccw[4].count = skb->len;
0756     if (set_normalized_cda(&ch->ccw[4], skb->data)) {
0757         /*
0758          * idal allocation failed, try via copying to trans_skb.
0759          * trans_skb usually has a pre-allocated idal.
0760          */
0761         if (ctcm_checkalloc_buffer(ch)) {
0762             /*
0763              * Remove our header.
0764              * It gets added again on retransmit.
0765              */
0766                 goto nomem_exit;
0767         }
0768 
0769         skb_reset_tail_pointer(ch->trans_skb);
0770         ch->trans_skb->len = 0;
0771         ch->ccw[1].count = skb->len;
0772         skb_put_data(ch->trans_skb, skb->data, skb->len);
0773         refcount_dec(&skb->users);
0774         dev_kfree_skb_irq(skb);
0775         ccw_idx = 0;
0776         CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
0777                 "up to 32 bytes sent to vtam:\n",
0778                 __func__, dev->name, ch->trans_skb->len);
0779         CTCM_D3_DUMP((char *)ch->trans_skb->data,
0780                 min_t(int, 32, ch->trans_skb->len));
0781     } else {
0782         skb_queue_tail(&ch->io_queue, skb);
0783         ccw_idx = 3;
0784     }
0785     ch->retry = 0;
0786     fsm_newstate(ch->fsm, CTC_STATE_TX);
0787     fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
0788 
0789     if (do_debug_ccw)
0790         ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
0791                     sizeof(struct ccw1) * 3);
0792 
0793     spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
0794     ch->prof.send_stamp = jiffies;
0795     rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
0796     spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
0797     if (ccw_idx == 3)
0798         ch->prof.doios_single++;
0799     if (rc != 0) {
0800         fsm_deltimer(&ch->timer);
0801         ctcm_ccw_check_rc(ch, rc, "single skb TX");
0802         if (ccw_idx == 3)
0803             skb_dequeue_tail(&ch->io_queue);
0804     } else if (ccw_idx == 0) {
0805         priv->stats.tx_packets++;
0806         priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
0807     }
0808     if (ch->th_seq_num > 0xf0000000)    /* Chose at random. */
0809         ctcmpc_send_sweep_req(ch);
0810 
0811     goto done;
0812 nomem_exit:
0813     CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
0814             "%s(%s): MEMORY allocation ERROR\n",
0815             CTCM_FUNTAIL, ch->id);
0816     rc = -ENOMEM;
0817     refcount_dec(&skb->users);
0818     dev_kfree_skb_any(skb);
0819     fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
0820 done:
0821     CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
0822     return rc;
0823 }
0824 
0825 /*
0826  * Start transmission of a packet.
0827  * Called from generic network device layer.
0828  *
0829  *  skb     Pointer to buffer containing the packet.
0830  *  dev     Pointer to interface struct.
0831  *
0832  * returns 0 if packet consumed, !0 if packet rejected.
0833  *         Note: If we return !0, then the packet is free'd by
0834  *               the generic network layer.
0835  */
0836 /* first merge version - leaving both functions separated */
0837 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
0838 {
0839     struct ctcm_priv *priv = dev->ml_priv;
0840 
0841     if (skb == NULL) {
0842         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0843                 "%s(%s): NULL sk_buff passed",
0844                     CTCM_FUNTAIL, dev->name);
0845         priv->stats.tx_dropped++;
0846         return NETDEV_TX_OK;
0847     }
0848     if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
0849         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
0850             "%s(%s): Got sk_buff with head room < %ld bytes",
0851             CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
0852         dev_kfree_skb(skb);
0853         priv->stats.tx_dropped++;
0854         return NETDEV_TX_OK;
0855     }
0856 
0857     /*
0858      * If channels are not running, try to restart them
0859      * and throw away packet.
0860      */
0861     if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
0862         fsm_event(priv->fsm, DEV_EVENT_START, dev);
0863         dev_kfree_skb(skb);
0864         priv->stats.tx_dropped++;
0865         priv->stats.tx_errors++;
0866         priv->stats.tx_carrier_errors++;
0867         return NETDEV_TX_OK;
0868     }
0869 
0870     if (ctcm_test_and_set_busy(dev))
0871         return NETDEV_TX_BUSY;
0872 
0873     netif_trans_update(dev);
0874     if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
0875         return NETDEV_TX_BUSY;
0876     return NETDEV_TX_OK;
0877 }
0878 
0879 /* unmerged MPC variant of ctcm_tx */
0880 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
0881 {
0882     int len = 0;
0883     struct ctcm_priv *priv = dev->ml_priv;
0884     struct mpc_group *grp  = priv->mpcg;
0885     struct sk_buff *newskb = NULL;
0886 
0887     /*
0888      * Some sanity checks ...
0889      */
0890     if (skb == NULL) {
0891         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0892             "%s(%s): NULL sk_buff passed",
0893                     CTCM_FUNTAIL, dev->name);
0894         priv->stats.tx_dropped++;
0895                     goto done;
0896     }
0897     if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
0898         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
0899             "%s(%s): Got sk_buff with head room < %ld bytes",
0900             CTCM_FUNTAIL, dev->name,
0901                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
0902 
0903         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
0904 
0905         len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
0906         newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
0907 
0908         if (!newskb) {
0909             CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
0910                 "%s: %s: __dev_alloc_skb failed",
0911                         __func__, dev->name);
0912 
0913             dev_kfree_skb_any(skb);
0914             priv->stats.tx_dropped++;
0915             priv->stats.tx_errors++;
0916             priv->stats.tx_carrier_errors++;
0917             fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0918                     goto done;
0919         }
0920         newskb->protocol = skb->protocol;
0921         skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
0922         skb_put_data(newskb, skb->data, skb->len);
0923         dev_kfree_skb_any(skb);
0924         skb = newskb;
0925     }
0926 
0927     /*
0928      * If channels are not running,
0929      * notify anybody about a link failure and throw
0930      * away packet.
0931      */
0932     if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
0933        (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
0934         dev_kfree_skb_any(skb);
0935         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0936             "%s(%s): inactive MPCGROUP - dropped",
0937                     CTCM_FUNTAIL, dev->name);
0938         priv->stats.tx_dropped++;
0939         priv->stats.tx_errors++;
0940         priv->stats.tx_carrier_errors++;
0941                     goto done;
0942     }
0943 
0944     if (ctcm_test_and_set_busy(dev)) {
0945         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0946             "%s(%s): device busy - dropped",
0947                     CTCM_FUNTAIL, dev->name);
0948         dev_kfree_skb_any(skb);
0949         priv->stats.tx_dropped++;
0950         priv->stats.tx_errors++;
0951         priv->stats.tx_carrier_errors++;
0952         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0953                     goto done;
0954     }
0955 
0956     netif_trans_update(dev);
0957     if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
0958         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
0959             "%s(%s): device error - dropped",
0960                     CTCM_FUNTAIL, dev->name);
0961         dev_kfree_skb_any(skb);
0962         priv->stats.tx_dropped++;
0963         priv->stats.tx_errors++;
0964         priv->stats.tx_carrier_errors++;
0965         ctcm_clear_busy(dev);
0966         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
0967                     goto done;
0968     }
0969     ctcm_clear_busy(dev);
0970 done:
0971     if (do_debug)
0972         MPC_DBF_DEV_NAME(TRACE, dev, "exit");
0973 
0974     return NETDEV_TX_OK;    /* handle freeing of skb here */
0975 }
0976 
0977 
0978 /*
0979  * Sets MTU of an interface.
0980  *
0981  *  dev     Pointer to interface struct.
0982  *  new_mtu The new MTU to use for this interface.
0983  *
0984  * returns 0 on success, -EINVAL if MTU is out of valid range.
0985  *         (valid range is 576 .. 65527). If VM is on the
0986  *         remote side, maximum MTU is 32760, however this is
0987  *         not checked here.
0988  */
0989 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
0990 {
0991     struct ctcm_priv *priv;
0992     int max_bufsize;
0993 
0994     priv = dev->ml_priv;
0995     max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
0996 
0997     if (IS_MPC(priv)) {
0998         if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
0999             return -EINVAL;
1000         dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1001     } else {
1002         if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1003             return -EINVAL;
1004         dev->hard_header_len = LL_HEADER_LENGTH + 2;
1005     }
1006     dev->mtu = new_mtu;
1007     return 0;
1008 }
1009 
1010 /*
1011  * Returns interface statistics of a device.
1012  *
1013  *  dev     Pointer to interface struct.
1014  *
1015  * returns Pointer to stats struct of this interface.
1016  */
1017 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1018 {
1019     return &((struct ctcm_priv *)dev->ml_priv)->stats;
1020 }
1021 
1022 static void ctcm_free_netdevice(struct net_device *dev)
1023 {
1024     struct ctcm_priv *priv;
1025     struct mpc_group *grp;
1026 
1027     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1028             "%s(%s)", CTCM_FUNTAIL, dev->name);
1029     priv = dev->ml_priv;
1030     if (priv) {
1031         grp = priv->mpcg;
1032         if (grp) {
1033             if (grp->fsm)
1034                 kfree_fsm(grp->fsm);
1035             dev_kfree_skb(grp->xid_skb);
1036             dev_kfree_skb(grp->rcvd_xid_skb);
1037             tasklet_kill(&grp->mpc_tasklet2);
1038             kfree(grp);
1039             priv->mpcg = NULL;
1040         }
1041         if (priv->fsm) {
1042             kfree_fsm(priv->fsm);
1043             priv->fsm = NULL;
1044         }
1045         kfree(priv->xid);
1046         priv->xid = NULL;
1047     /*
1048      * Note: kfree(priv); is done in "opposite" function of
1049      * allocator function probe_device which is remove_device.
1050      */
1051     }
1052 #ifdef MODULE
1053     free_netdev(dev);
1054 #endif
1055 }
1056 
1057 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1058 
1059 static const struct net_device_ops ctcm_netdev_ops = {
1060     .ndo_open       = ctcm_open,
1061     .ndo_stop       = ctcm_close,
1062     .ndo_get_stats      = ctcm_stats,
1063     .ndo_change_mtu     = ctcm_change_mtu,
1064     .ndo_start_xmit     = ctcm_tx,
1065 };
1066 
1067 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1068     .ndo_open       = ctcm_open,
1069     .ndo_stop       = ctcm_close,
1070     .ndo_get_stats      = ctcm_stats,
1071     .ndo_change_mtu     = ctcm_change_mtu,
1072     .ndo_start_xmit     = ctcmpc_tx,
1073 };
1074 
1075 static void ctcm_dev_setup(struct net_device *dev)
1076 {
1077     dev->type = ARPHRD_SLIP;
1078     dev->tx_queue_len = 100;
1079     dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1080     dev->min_mtu = 576;
1081     dev->max_mtu = 65527;
1082 }
1083 
1084 /*
1085  * Initialize everything of the net device except the name and the
1086  * channel structs.
1087  */
1088 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1089 {
1090     struct net_device *dev;
1091     struct mpc_group *grp;
1092     if (!priv)
1093         return NULL;
1094 
1095     if (IS_MPC(priv))
1096         dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1097                    ctcm_dev_setup);
1098     else
1099         dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1100                    ctcm_dev_setup);
1101 
1102     if (!dev) {
1103         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1104             "%s: MEMORY allocation ERROR",
1105             CTCM_FUNTAIL);
1106         return NULL;
1107     }
1108     dev->ml_priv = priv;
1109     priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1110                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1111                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1112     if (priv->fsm == NULL) {
1113         CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1114         free_netdev(dev);
1115         return NULL;
1116     }
1117     fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1118     fsm_settimer(priv->fsm, &priv->restart_timer);
1119 
1120     if (IS_MPC(priv)) {
1121         /*  MPC Group Initializations  */
1122         grp = ctcmpc_init_mpc_group(priv);
1123         if (grp == NULL) {
1124             MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1125             free_netdev(dev);
1126             return NULL;
1127         }
1128         tasklet_init(&grp->mpc_tasklet2,
1129                 mpc_group_ready, (unsigned long)dev);
1130         dev->mtu = MPC_BUFSIZE_DEFAULT -
1131                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1132 
1133         dev->netdev_ops = &ctcm_mpc_netdev_ops;
1134         dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1135         priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1136     } else {
1137         dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1138         dev->netdev_ops = &ctcm_netdev_ops;
1139         dev->hard_header_len = LL_HEADER_LENGTH + 2;
1140     }
1141 
1142     CTCMY_DBF_DEV(SETUP, dev, "finished");
1143 
1144     return dev;
1145 }
1146 
1147 /*
1148  * Main IRQ handler.
1149  *
1150  *  cdev    The ccw_device the interrupt is for.
1151  *  intparm interruption parameter.
1152  *  irb     interruption response block.
1153  */
1154 static void ctcm_irq_handler(struct ccw_device *cdev,
1155                 unsigned long intparm, struct irb *irb)
1156 {
1157     struct channel      *ch;
1158     struct net_device   *dev;
1159     struct ctcm_priv    *priv;
1160     struct ccwgroup_device  *cgdev;
1161     int cstat;
1162     int dstat;
1163 
1164     CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1165         "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1166 
1167     if (ctcm_check_irb_error(cdev, irb))
1168         return;
1169 
1170     cgdev = dev_get_drvdata(&cdev->dev);
1171 
1172     cstat = irb->scsw.cmd.cstat;
1173     dstat = irb->scsw.cmd.dstat;
1174 
1175     /* Check for unsolicited interrupts. */
1176     if (cgdev == NULL) {
1177         CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1178             "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1179             CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1180         dev_warn(&cdev->dev,
1181             "The adapter received a non-specific IRQ\n");
1182         return;
1183     }
1184 
1185     priv = dev_get_drvdata(&cgdev->dev);
1186 
1187     /* Try to extract channel from driver data. */
1188     if (priv->channel[CTCM_READ]->cdev == cdev)
1189         ch = priv->channel[CTCM_READ];
1190     else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1191         ch = priv->channel[CTCM_WRITE];
1192     else {
1193         dev_err(&cdev->dev,
1194             "%s: Internal error: Can't determine channel for "
1195             "interrupt device %s\n",
1196             __func__, dev_name(&cdev->dev));
1197             /* Explain: inconsistent internal structures */
1198         return;
1199     }
1200 
1201     dev = ch->netdev;
1202     if (dev == NULL) {
1203         dev_err(&cdev->dev,
1204             "%s Internal error: net_device is NULL, ch = 0x%p\n",
1205             __func__, ch);
1206             /* Explain: inconsistent internal structures */
1207         return;
1208     }
1209 
1210     /* Copy interruption response block. */
1211     memcpy(ch->irb, irb, sizeof(struct irb));
1212 
1213     /* Issue error message and return on subchannel error code */
1214     if (irb->scsw.cmd.cstat) {
1215         fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1216         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1217             "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1218                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1219         dev_warn(&cdev->dev,
1220                 "A check occurred on the subchannel\n");
1221         return;
1222     }
1223 
1224     /* Check the reason-code of a unit check */
1225     if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1226         if ((irb->ecw[0] & ch->sense_rc) == 0)
1227             /* print it only once */
1228             CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1229                 "%s(%s): sense=%02x, ds=%02x",
1230                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1231         ccw_unit_check(ch, irb->ecw[0]);
1232         return;
1233     }
1234     if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1235         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1236             fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1237         else
1238             fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1239         return;
1240     }
1241     if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1242         fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1243         return;
1244     }
1245     if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1246         (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1247         (irb->scsw.cmd.stctl ==
1248          (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1249         fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1250     else
1251         fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1252 
1253 }
1254 
1255 static const struct device_type ctcm_devtype = {
1256     .name = "ctcm",
1257     .groups = ctcm_attr_groups,
1258 };
1259 
1260 /*
1261  * Add ctcm specific attributes.
1262  * Add ctcm private data.
1263  *
1264  *  cgdev   pointer to ccwgroup_device just added
1265  *
1266  * returns 0 on success, !0 on failure.
1267  */
1268 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1269 {
1270     struct ctcm_priv *priv;
1271 
1272     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1273             "%s %p",
1274             __func__, cgdev);
1275 
1276     if (!get_device(&cgdev->dev))
1277         return -ENODEV;
1278 
1279     priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1280     if (!priv) {
1281         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1282             "%s: memory allocation failure",
1283             CTCM_FUNTAIL);
1284         put_device(&cgdev->dev);
1285         return -ENOMEM;
1286     }
1287     priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1288     cgdev->cdev[0]->handler = ctcm_irq_handler;
1289     cgdev->cdev[1]->handler = ctcm_irq_handler;
1290     dev_set_drvdata(&cgdev->dev, priv);
1291     cgdev->dev.type = &ctcm_devtype;
1292 
1293     return 0;
1294 }
1295 
1296 /*
1297  * Add a new channel to the list of channels.
1298  * Keeps the channel list sorted.
1299  *
1300  *  cdev    The ccw_device to be added.
1301  *  type    The type class of the new channel.
1302  *  priv    Points to the private data of the ccwgroup_device.
1303  *
1304  * returns 0 on success, !0 on error.
1305  */
1306 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1307                 struct ctcm_priv *priv)
1308 {
1309     struct channel **c = &channels;
1310     struct channel *ch;
1311     int ccw_num;
1312     int rc = 0;
1313 
1314     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1315         "%s(%s), type %d, proto %d",
1316             __func__, dev_name(&cdev->dev), type, priv->protocol);
1317 
1318     ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1319     if (ch == NULL)
1320         return -ENOMEM;
1321 
1322     ch->protocol = priv->protocol;
1323     if (IS_MPC(priv)) {
1324         ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL);
1325         if (ch->discontact_th == NULL)
1326                     goto nomem_return;
1327 
1328         ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1329         tasklet_init(&ch->ch_disc_tasklet,
1330             mpc_action_send_discontact, (unsigned long)ch);
1331 
1332         tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1333         ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1334         ccw_num = 17;
1335     } else
1336         ccw_num = 8;
1337 
1338     ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1339     if (ch->ccw == NULL)
1340                     goto nomem_return;
1341 
1342     ch->cdev = cdev;
1343     snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1344     ch->type = type;
1345 
1346     /*
1347      * "static" ccws are used in the following way:
1348      *
1349      * ccw[0..2] (Channel program for generic I/O):
1350      *           0: prepare
1351      *           1: read or write (depending on direction) with fixed
1352      *              buffer (idal allocated once when buffer is allocated)
1353      *           2: nop
1354      * ccw[3..5] (Channel program for direct write of packets)
1355      *           3: prepare
1356      *           4: write (idal allocated on every write).
1357      *           5: nop
1358      * ccw[6..7] (Channel program for initial channel setup):
1359      *           6: set extended mode
1360      *           7: nop
1361      *
1362      * ch->ccw[0..5] are initialized in ch_action_start because
1363      * the channel's direction is yet unknown here.
1364      *
1365      * ccws used for xid2 negotiations
1366      *  ch-ccw[8-14] need to be used for the XID exchange either
1367      *    X side XID2 Processing
1368      *       8:  write control
1369      *       9:  write th
1370      *       10: write XID
1371      *       11: read th from secondary
1372      *       12: read XID   from secondary
1373      *       13: read 4 byte ID
1374      *       14: nop
1375      *    Y side XID Processing
1376      *       8:  sense
1377      *       9:  read th
1378      *       10: read XID
1379      *       11: write th
1380      *       12: write XID
1381      *       13: write 4 byte ID
1382      *       14: nop
1383      *
1384      *  ccws used for double noop due to VM timing issues
1385      *  which result in unrecoverable Busy on channel
1386      *       15: nop
1387      *       16: nop
1388      */
1389     ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1390     ch->ccw[6].flags    = CCW_FLAG_SLI;
1391 
1392     ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1393     ch->ccw[7].flags    = CCW_FLAG_SLI;
1394 
1395     if (IS_MPC(priv)) {
1396         ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1397         ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1398         ch->ccw[15].count    = TH_HEADER_LENGTH;
1399         ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1400 
1401         ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1402         ch->ccw[16].flags    = CCW_FLAG_SLI;
1403 
1404         ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1405                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1406                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1407                 mpc_ch_fsm_len, GFP_KERNEL);
1408     } else {
1409         ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1410                 ctc_ch_event_names, CTC_NR_STATES,
1411                 CTC_NR_EVENTS, ch_fsm,
1412                 ch_fsm_len, GFP_KERNEL);
1413     }
1414     if (ch->fsm == NULL)
1415                 goto nomem_return;
1416 
1417     fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1418 
1419     ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1420     if (ch->irb == NULL)
1421                 goto nomem_return;
1422 
1423     while (*c && ctcm_less_than((*c)->id, ch->id))
1424         c = &(*c)->next;
1425 
1426     if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1427         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1428                 "%s (%s) already in list, using old entry",
1429                 __func__, (*c)->id);
1430 
1431                 goto free_return;
1432     }
1433 
1434     spin_lock_init(&ch->collect_lock);
1435 
1436     fsm_settimer(ch->fsm, &ch->timer);
1437     skb_queue_head_init(&ch->io_queue);
1438     skb_queue_head_init(&ch->collect_queue);
1439 
1440     if (IS_MPC(priv)) {
1441         fsm_settimer(ch->fsm, &ch->sweep_timer);
1442         skb_queue_head_init(&ch->sweep_queue);
1443     }
1444     ch->next = *c;
1445     *c = ch;
1446     return 0;
1447 
1448 nomem_return:
1449     rc = -ENOMEM;
1450 
1451 free_return:    /* note that all channel pointers are 0 or valid */
1452     kfree(ch->ccw);
1453     kfree(ch->discontact_th);
1454     kfree_fsm(ch->fsm);
1455     kfree(ch->irb);
1456     kfree(ch);
1457     return rc;
1458 }
1459 
1460 /*
1461  * Return type of a detected device.
1462  */
1463 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1464 {
1465     enum ctcm_channel_types type;
1466     type = (enum ctcm_channel_types)id->driver_info;
1467 
1468     if (type == ctcm_channel_type_ficon)
1469         type = ctcm_channel_type_escon;
1470 
1471     return type;
1472 }
1473 
1474 /*
1475  *
1476  * Setup an interface.
1477  *
1478  *  cgdev   Device to be setup.
1479  *
1480  * returns 0 on success, !0 on failure.
1481  */
1482 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1483 {
1484     char read_id[CTCM_ID_SIZE];
1485     char write_id[CTCM_ID_SIZE];
1486     int direction;
1487     enum ctcm_channel_types type;
1488     struct ctcm_priv *priv;
1489     struct net_device *dev;
1490     struct ccw_device *cdev0;
1491     struct ccw_device *cdev1;
1492     struct channel *readc;
1493     struct channel *writec;
1494     int ret;
1495     int result;
1496 
1497     priv = dev_get_drvdata(&cgdev->dev);
1498     if (!priv) {
1499         result = -ENODEV;
1500         goto out_err_result;
1501     }
1502 
1503     cdev0 = cgdev->cdev[0];
1504     cdev1 = cgdev->cdev[1];
1505 
1506     type = get_channel_type(&cdev0->id);
1507 
1508     snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1509     snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1510 
1511     ret = add_channel(cdev0, type, priv);
1512     if (ret) {
1513         result = ret;
1514         goto out_err_result;
1515     }
1516     ret = add_channel(cdev1, type, priv);
1517     if (ret) {
1518         result = ret;
1519         goto out_remove_channel1;
1520     }
1521 
1522     ret = ccw_device_set_online(cdev0);
1523     if (ret != 0) {
1524         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1525             "%s(%s) set_online rc=%d",
1526                 CTCM_FUNTAIL, read_id, ret);
1527         result = -EIO;
1528         goto out_remove_channel2;
1529     }
1530 
1531     ret = ccw_device_set_online(cdev1);
1532     if (ret != 0) {
1533         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1534             "%s(%s) set_online rc=%d",
1535                 CTCM_FUNTAIL, write_id, ret);
1536 
1537         result = -EIO;
1538         goto out_ccw1;
1539     }
1540 
1541     dev = ctcm_init_netdevice(priv);
1542     if (dev == NULL) {
1543         result = -ENODEV;
1544         goto out_ccw2;
1545     }
1546 
1547     for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1548         priv->channel[direction] =
1549             channel_get(type, direction == CTCM_READ ?
1550                 read_id : write_id, direction);
1551         if (priv->channel[direction] == NULL) {
1552             if (direction == CTCM_WRITE)
1553                 channel_free(priv->channel[CTCM_READ]);
1554             result = -ENODEV;
1555             goto out_dev;
1556         }
1557         priv->channel[direction]->netdev = dev;
1558         priv->channel[direction]->protocol = priv->protocol;
1559         priv->channel[direction]->max_bufsize = priv->buffer_size;
1560     }
1561     /* sysfs magic */
1562     SET_NETDEV_DEV(dev, &cgdev->dev);
1563 
1564     if (register_netdev(dev)) {
1565         result = -ENODEV;
1566         goto out_dev;
1567     }
1568 
1569     strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1570 
1571     dev_info(&dev->dev,
1572         "setup OK : r/w = %s/%s, protocol : %d\n",
1573             priv->channel[CTCM_READ]->id,
1574             priv->channel[CTCM_WRITE]->id, priv->protocol);
1575 
1576     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1577         "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1578             priv->channel[CTCM_READ]->id,
1579             priv->channel[CTCM_WRITE]->id, priv->protocol);
1580 
1581     return 0;
1582 out_dev:
1583     ctcm_free_netdevice(dev);
1584 out_ccw2:
1585     ccw_device_set_offline(cgdev->cdev[1]);
1586 out_ccw1:
1587     ccw_device_set_offline(cgdev->cdev[0]);
1588 out_remove_channel2:
1589     readc = channel_get(type, read_id, CTCM_READ);
1590     channel_remove(readc);
1591 out_remove_channel1:
1592     writec = channel_get(type, write_id, CTCM_WRITE);
1593     channel_remove(writec);
1594 out_err_result:
1595     return result;
1596 }
1597 
1598 /*
1599  * Shutdown an interface.
1600  *
1601  *  cgdev   Device to be shut down.
1602  *
1603  * returns 0 on success, !0 on failure.
1604  */
1605 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1606 {
1607     struct ctcm_priv *priv;
1608     struct net_device *dev;
1609 
1610     priv = dev_get_drvdata(&cgdev->dev);
1611     if (!priv)
1612         return -ENODEV;
1613 
1614     if (priv->channel[CTCM_READ]) {
1615         dev = priv->channel[CTCM_READ]->netdev;
1616         CTCM_DBF_DEV(SETUP, dev, "");
1617         /* Close the device */
1618         ctcm_close(dev);
1619         dev->flags &= ~IFF_RUNNING;
1620         channel_free(priv->channel[CTCM_READ]);
1621     } else
1622         dev = NULL;
1623 
1624     if (priv->channel[CTCM_WRITE])
1625         channel_free(priv->channel[CTCM_WRITE]);
1626 
1627     if (dev) {
1628         unregister_netdev(dev);
1629         ctcm_free_netdevice(dev);
1630     }
1631 
1632     if (priv->fsm)
1633         kfree_fsm(priv->fsm);
1634 
1635     ccw_device_set_offline(cgdev->cdev[1]);
1636     ccw_device_set_offline(cgdev->cdev[0]);
1637     channel_remove(priv->channel[CTCM_READ]);
1638     channel_remove(priv->channel[CTCM_WRITE]);
1639     priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1640 
1641     return 0;
1642 
1643 }
1644 
1645 
1646 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1647 {
1648     struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1649 
1650     CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1651             "removing device %p, proto : %d",
1652             cgdev, priv->protocol);
1653 
1654     if (cgdev->state == CCWGROUP_ONLINE)
1655         ctcm_shutdown_device(cgdev);
1656     dev_set_drvdata(&cgdev->dev, NULL);
1657     kfree(priv);
1658     put_device(&cgdev->dev);
1659 }
1660 
1661 static struct ccw_device_id ctcm_ids[] = {
1662     {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1663     {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1664     {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1665     {},
1666 };
1667 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1668 
1669 static struct ccw_driver ctcm_ccw_driver = {
1670     .driver = {
1671         .owner  = THIS_MODULE,
1672         .name   = "ctcm",
1673     },
1674     .ids    = ctcm_ids,
1675     .probe  = ccwgroup_probe_ccwdev,
1676     .remove = ccwgroup_remove_ccwdev,
1677     .int_class = IRQIO_CTC,
1678 };
1679 
1680 static struct ccwgroup_driver ctcm_group_driver = {
1681     .driver = {
1682         .owner  = THIS_MODULE,
1683         .name   = CTC_DRIVER_NAME,
1684     },
1685     .ccw_driver  = &ctcm_ccw_driver,
1686     .setup       = ctcm_probe_device,
1687     .remove      = ctcm_remove_device,
1688     .set_online  = ctcm_new_device,
1689     .set_offline = ctcm_shutdown_device,
1690 };
1691 
1692 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1693                size_t count)
1694 {
1695     int err;
1696 
1697     err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1698     return err ? err : count;
1699 }
1700 static DRIVER_ATTR_WO(group);
1701 
1702 static struct attribute *ctcm_drv_attrs[] = {
1703     &driver_attr_group.attr,
1704     NULL,
1705 };
1706 static struct attribute_group ctcm_drv_attr_group = {
1707     .attrs = ctcm_drv_attrs,
1708 };
1709 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1710     &ctcm_drv_attr_group,
1711     NULL,
1712 };
1713 
1714 /*
1715  * Module related routines
1716  */
1717 
1718 /*
1719  * Prepare to be unloaded. Free IRQ's and release all resources.
1720  * This is called just before this module is unloaded. It is
1721  * not called, if the usage count is !0, so we don't need to check
1722  * for that.
1723  */
1724 static void __exit ctcm_exit(void)
1725 {
1726     ccwgroup_driver_unregister(&ctcm_group_driver);
1727     ccw_driver_unregister(&ctcm_ccw_driver);
1728     root_device_unregister(ctcm_root_dev);
1729     ctcm_unregister_dbf_views();
1730     pr_info("CTCM driver unloaded\n");
1731 }
1732 
1733 /*
1734  * Print Banner.
1735  */
1736 static void print_banner(void)
1737 {
1738     pr_info("CTCM driver initialized\n");
1739 }
1740 
1741 /*
1742  * Initialize module.
1743  * This is called just after the module is loaded.
1744  *
1745  * returns 0 on success, !0 on error.
1746  */
1747 static int __init ctcm_init(void)
1748 {
1749     int ret;
1750 
1751     channels = NULL;
1752 
1753     ret = ctcm_register_dbf_views();
1754     if (ret)
1755         goto out_err;
1756     ctcm_root_dev = root_device_register("ctcm");
1757     ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1758     if (ret)
1759         goto register_err;
1760     ret = ccw_driver_register(&ctcm_ccw_driver);
1761     if (ret)
1762         goto ccw_err;
1763     ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1764     ret = ccwgroup_driver_register(&ctcm_group_driver);
1765     if (ret)
1766         goto ccwgroup_err;
1767     print_banner();
1768     return 0;
1769 
1770 ccwgroup_err:
1771     ccw_driver_unregister(&ctcm_ccw_driver);
1772 ccw_err:
1773     root_device_unregister(ctcm_root_dev);
1774 register_err:
1775     ctcm_unregister_dbf_views();
1776 out_err:
1777     pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1778         __func__, ret);
1779     return ret;
1780 }
1781 
1782 module_init(ctcm_init);
1783 module_exit(ctcm_exit);
1784 
1785 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1786 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1787 MODULE_LICENSE("GPL");
1788
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