1/* 2 * drivers/s390/net/ctcm_main.c 3 * 4 * Copyright IBM Corp. 2001, 2009 5 * Author(s): 6 * Original CTC driver(s): 7 * Fritz Elfert (felfert@millenux.com) 8 * Dieter Wellerdiek (wel@de.ibm.com) 9 * Martin Schwidefsky (schwidefsky@de.ibm.com) 10 * Denis Joseph Barrow (barrow_dj@yahoo.com) 11 * Jochen Roehrig (roehrig@de.ibm.com) 12 * Cornelia Huck <cornelia.huck@de.ibm.com> 13 * MPC additions: 14 * Belinda Thompson (belindat@us.ibm.com) 15 * Andy Richter (richtera@us.ibm.com) 16 * Revived by: 17 * Peter Tiedemann (ptiedem@de.ibm.com) 18 */ 19 20#undef DEBUG 21#undef DEBUGDATA 22#undef DEBUGCCW 23 24#define KMSG_COMPONENT "ctcm" 25#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 26 27#include <linux/module.h> 28#include <linux/init.h> 29#include <linux/kernel.h> 30#include <linux/slab.h> 31#include <linux/errno.h> 32#include <linux/types.h> 33#include <linux/interrupt.h> 34#include <linux/timer.h> 35#include <linux/bitops.h> 36 37#include <linux/signal.h> 38#include <linux/string.h> 39 40#include <linux/ip.h> 41#include <linux/if_arp.h> 42#include <linux/tcp.h> 43#include <linux/skbuff.h> 44#include <linux/ctype.h> 45#include <net/dst.h> 46 47#include <linux/io.h> 48#include <asm/ccwdev.h> 49#include <asm/ccwgroup.h> 50#include <linux/uaccess.h> 51 52#include <asm/idals.h> 53 54#include "ctcm_fsms.h" 55#include "ctcm_main.h" 56 57/* Some common global variables */ 58 59/** 60 * The root device for ctcm group devices 61 */ 62static struct device *ctcm_root_dev; 63 64/* 65 * Linked list of all detected channels. 66 */ 67struct channel *channels; 68 69/** 70 * Unpack a just received skb and hand it over to 71 * upper layers. 72 * 73 * ch The channel where this skb has been received. 74 * pskb The received skb. 75 */ 76void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) 77{ 78 struct net_device *dev = ch->netdev; 79 struct ctcm_priv *priv = dev->ml_priv; 80 __u16 len = *((__u16 *) pskb->data); 81 82 skb_put(pskb, 2 + LL_HEADER_LENGTH); 83 skb_pull(pskb, 2); 84 pskb->dev = dev; 85 pskb->ip_summed = CHECKSUM_UNNECESSARY; 86 while (len > 0) { 87 struct sk_buff *skb; 88 int skblen; 89 struct ll_header *header = (struct ll_header *)pskb->data; 90 91 skb_pull(pskb, LL_HEADER_LENGTH); 92 if ((ch->protocol == CTCM_PROTO_S390) && 93 (header->type != ETH_P_IP)) { 94 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { 95 ch->logflags |= LOG_FLAG_ILLEGALPKT; 96 /* 97 * Check packet type only if we stick strictly 98 * to S/390's protocol of OS390. This only 99 * supports IP. Otherwise allow any packet 100 * type. 101 */ 102 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 103 "%s(%s): Illegal packet type 0x%04x" 104 " - dropping", 105 CTCM_FUNTAIL, dev->name, header->type); 106 } 107 priv->stats.rx_dropped++; 108 priv->stats.rx_frame_errors++; 109 return; 110 } 111 pskb->protocol = ntohs(header->type); 112 if ((header->length <= LL_HEADER_LENGTH) || 113 (len <= LL_HEADER_LENGTH)) { 114 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { 115 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 116 "%s(%s): Illegal packet size %d(%d,%d)" 117 "- dropping", 118 CTCM_FUNTAIL, dev->name, 119 header->length, dev->mtu, len); 120 ch->logflags |= LOG_FLAG_ILLEGALSIZE; 121 } 122 123 priv->stats.rx_dropped++; 124 priv->stats.rx_length_errors++; 125 return; 126 } 127 header->length -= LL_HEADER_LENGTH; 128 len -= LL_HEADER_LENGTH; 129 if ((header->length > skb_tailroom(pskb)) || 130 (header->length > len)) { 131 if (!(ch->logflags & LOG_FLAG_OVERRUN)) { 132 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 133 "%s(%s): Packet size %d (overrun)" 134 " - dropping", CTCM_FUNTAIL, 135 dev->name, header->length); 136 ch->logflags |= LOG_FLAG_OVERRUN; 137 } 138 139 priv->stats.rx_dropped++; 140 priv->stats.rx_length_errors++; 141 return; 142 } 143 skb_put(pskb, header->length); 144 skb_reset_mac_header(pskb); 145 len -= header->length; 146 skb = dev_alloc_skb(pskb->len); 147 if (!skb) { 148 if (!(ch->logflags & LOG_FLAG_NOMEM)) { 149 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 150 "%s(%s): MEMORY allocation error", 151 CTCM_FUNTAIL, dev->name); 152 ch->logflags |= LOG_FLAG_NOMEM; 153 } 154 priv->stats.rx_dropped++; 155 return; 156 } 157 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), 158 pskb->len); 159 skb_reset_mac_header(skb); 160 skb->dev = pskb->dev; 161 skb->protocol = pskb->protocol; 162 pskb->ip_summed = CHECKSUM_UNNECESSARY; 163 skblen = skb->len; 164 /* 165 * reset logflags 166 */ 167 ch->logflags = 0; 168 priv->stats.rx_packets++; 169 priv->stats.rx_bytes += skblen; 170 netif_rx_ni(skb); 171 if (len > 0) { 172 skb_pull(pskb, header->length); 173 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { 174 CTCM_DBF_DEV_NAME(TRACE, dev, 175 "Overrun in ctcm_unpack_skb"); 176 ch->logflags |= LOG_FLAG_OVERRUN; 177 return; 178 } 179 skb_put(pskb, LL_HEADER_LENGTH); 180 } 181 } 182} 183 184/** 185 * Release a specific channel in the channel list. 186 * 187 * ch Pointer to channel struct to be released. 188 */ 189static void channel_free(struct channel *ch) 190{ 191 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); 192 ch->flags &= ~CHANNEL_FLAGS_INUSE; 193 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 194} 195 196/** 197 * Remove a specific channel in the channel list. 198 * 199 * ch Pointer to channel struct to be released. 200 */ 201static void channel_remove(struct channel *ch) 202{ 203 struct channel **c = &channels; 204 char chid[CTCM_ID_SIZE+1]; 205 int ok = 0; 206 207 if (ch == NULL) 208 return; 209 else 210 strncpy(chid, ch->id, CTCM_ID_SIZE); 211 212 channel_free(ch); 213 while (*c) { 214 if (*c == ch) { 215 *c = ch->next; 216 fsm_deltimer(&ch->timer); 217 if (IS_MPC(ch)) 218 fsm_deltimer(&ch->sweep_timer); 219 220 kfree_fsm(ch->fsm); 221 clear_normalized_cda(&ch->ccw[4]); 222 if (ch->trans_skb != NULL) { 223 clear_normalized_cda(&ch->ccw[1]); 224 dev_kfree_skb_any(ch->trans_skb); 225 } 226 if (IS_MPC(ch)) { 227 tasklet_kill(&ch->ch_tasklet); 228 tasklet_kill(&ch->ch_disc_tasklet); 229 kfree(ch->discontact_th); 230 } 231 kfree(ch->ccw); 232 kfree(ch->irb); 233 kfree(ch); 234 ok = 1; 235 break; 236 } 237 c = &((*c)->next); 238 } 239 240 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, 241 chid, ok ? "OK" : "failed"); 242} 243 244/** 245 * Get a specific channel from the channel list. 246 * 247 * type Type of channel we are interested in. 248 * id Id of channel we are interested in. 249 * direction Direction we want to use this channel for. 250 * 251 * returns Pointer to a channel or NULL if no matching channel available. 252 */ 253static struct channel *channel_get(enum ctcm_channel_types type, 254 char *id, int direction) 255{ 256 struct channel *ch = channels; 257 258 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) 259 ch = ch->next; 260 if (!ch) { 261 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 262 "%s(%d, %s, %d) not found in channel list\n", 263 CTCM_FUNTAIL, type, id, direction); 264 } else { 265 if (ch->flags & CHANNEL_FLAGS_INUSE) 266 ch = NULL; 267 else { 268 ch->flags |= CHANNEL_FLAGS_INUSE; 269 ch->flags &= ~CHANNEL_FLAGS_RWMASK; 270 ch->flags |= (direction == CTCM_WRITE) 271 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; 272 fsm_newstate(ch->fsm, CTC_STATE_STOPPED); 273 } 274 } 275 return ch; 276} 277 278static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) 279{ 280 if (!IS_ERR(irb)) 281 return 0; 282 283 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, 284 "irb error %ld on device %s\n", 285 PTR_ERR(irb), dev_name(&cdev->dev)); 286 287 switch (PTR_ERR(irb)) { 288 case -EIO: 289 dev_err(&cdev->dev, 290 "An I/O-error occurred on the CTCM device\n"); 291 break; 292 case -ETIMEDOUT: 293 dev_err(&cdev->dev, 294 "An adapter hardware operation timed out\n"); 295 break; 296 default: 297 dev_err(&cdev->dev, 298 "An error occurred on the adapter hardware\n"); 299 } 300 return PTR_ERR(irb); 301} 302 303 304/** 305 * Check sense of a unit check. 306 * 307 * ch The channel, the sense code belongs to. 308 * sense The sense code to inspect. 309 */ 310static inline void ccw_unit_check(struct channel *ch, __u8 sense) 311{ 312 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 313 "%s(%s): %02x", 314 CTCM_FUNTAIL, ch->id, sense); 315 316 if (sense & SNS0_INTERVENTION_REQ) { 317 if (sense & 0x01) { 318 if (ch->sense_rc != 0x01) { 319 pr_notice( 320 "%s: The communication peer has " 321 "disconnected\n", ch->id); 322 ch->sense_rc = 0x01; 323 } 324 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); 325 } else { 326 if (ch->sense_rc != SNS0_INTERVENTION_REQ) { 327 pr_notice( 328 "%s: The remote operating system is " 329 "not available\n", ch->id); 330 ch->sense_rc = SNS0_INTERVENTION_REQ; 331 } 332 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); 333 } 334 } else if (sense & SNS0_EQUIPMENT_CHECK) { 335 if (sense & SNS0_BUS_OUT_CHECK) { 336 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 337 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 338 "%s(%s): remote HW error %02x", 339 CTCM_FUNTAIL, ch->id, sense); 340 ch->sense_rc = SNS0_BUS_OUT_CHECK; 341 } 342 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); 343 } else { 344 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { 345 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 346 "%s(%s): remote read parity error %02x", 347 CTCM_FUNTAIL, ch->id, sense); 348 ch->sense_rc = SNS0_EQUIPMENT_CHECK; 349 } 350 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); 351 } 352 } else if (sense & SNS0_BUS_OUT_CHECK) { 353 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 354 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 355 "%s(%s): BUS OUT error %02x", 356 CTCM_FUNTAIL, ch->id, sense); 357 ch->sense_rc = SNS0_BUS_OUT_CHECK; 358 } 359 if (sense & 0x04) /* data-streaming timeout */ 360 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); 361 else /* Data-transfer parity error */ 362 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); 363 } else if (sense & SNS0_CMD_REJECT) { 364 if (ch->sense_rc != SNS0_CMD_REJECT) { 365 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 366 "%s(%s): Command rejected", 367 CTCM_FUNTAIL, ch->id); 368 ch->sense_rc = SNS0_CMD_REJECT; 369 } 370 } else if (sense == 0) { 371 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 372 "%s(%s): Unit check ZERO", 373 CTCM_FUNTAIL, ch->id); 374 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); 375 } else { 376 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 377 "%s(%s): Unit check code %02x unknown", 378 CTCM_FUNTAIL, ch->id, sense); 379 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); 380 } 381} 382 383int ctcm_ch_alloc_buffer(struct channel *ch) 384{ 385 clear_normalized_cda(&ch->ccw[1]); 386 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); 387 if (ch->trans_skb == NULL) { 388 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 389 "%s(%s): %s trans_skb allocation error", 390 CTCM_FUNTAIL, ch->id, 391 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 392 "RX" : "TX"); 393 return -ENOMEM; 394 } 395 396 ch->ccw[1].count = ch->max_bufsize; 397 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 398 dev_kfree_skb(ch->trans_skb); 399 ch->trans_skb = NULL; 400 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 401 "%s(%s): %s set norm_cda failed", 402 CTCM_FUNTAIL, ch->id, 403 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 404 "RX" : "TX"); 405 return -ENOMEM; 406 } 407 408 ch->ccw[1].count = 0; 409 ch->trans_skb_data = ch->trans_skb->data; 410 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; 411 return 0; 412} 413 414/* 415 * Interface API for upper network layers 416 */ 417 418/** 419 * Open an interface. 420 * Called from generic network layer when ifconfig up is run. 421 * 422 * dev Pointer to interface struct. 423 * 424 * returns 0 on success, -ERRNO on failure. (Never fails.) 425 */ 426int ctcm_open(struct net_device *dev) 427{ 428 struct ctcm_priv *priv = dev->ml_priv; 429 430 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 431 if (!IS_MPC(priv)) 432 fsm_event(priv->fsm, DEV_EVENT_START, dev); 433 return 0; 434} 435 436/** 437 * Close an interface. 438 * Called from generic network layer when ifconfig down is run. 439 * 440 * dev Pointer to interface struct. 441 * 442 * returns 0 on success, -ERRNO on failure. (Never fails.) 443 */ 444int ctcm_close(struct net_device *dev) 445{ 446 struct ctcm_priv *priv = dev->ml_priv; 447 448 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 449 if (!IS_MPC(priv)) 450 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 451 return 0; 452} 453 454 455/** 456 * Transmit a packet. 457 * This is a helper function for ctcm_tx(). 458 * 459 * ch Channel to be used for sending. 460 * skb Pointer to struct sk_buff of packet to send. 461 * The linklevel header has already been set up 462 * by ctcm_tx(). 463 * 464 * returns 0 on success, -ERRNO on failure. (Never fails.) 465 */ 466static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) 467{ 468 unsigned long saveflags; 469 struct ll_header header; 470 int rc = 0; 471 __u16 block_len; 472 int ccw_idx; 473 struct sk_buff *nskb; 474 unsigned long hi; 475 476 /* we need to acquire the lock for testing the state 477 * otherwise we can have an IRQ changing the state to 478 * TXIDLE after the test but before acquiring the lock. 479 */ 480 spin_lock_irqsave(&ch->collect_lock, saveflags); 481 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { 482 int l = skb->len + LL_HEADER_LENGTH; 483 484 if (ch->collect_len + l > ch->max_bufsize - 2) { 485 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 486 return -EBUSY; 487 } else { 488 atomic_inc(&skb->users); 489 header.length = l; 490 header.type = skb->protocol; 491 header.unused = 0; 492 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, 493 LL_HEADER_LENGTH); 494 skb_queue_tail(&ch->collect_queue, skb); 495 ch->collect_len += l; 496 } 497 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 498 goto done; 499 } 500 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 501 /* 502 * Protect skb against beeing free'd by upper 503 * layers. 504 */ 505 atomic_inc(&skb->users); 506 ch->prof.txlen += skb->len; 507 header.length = skb->len + LL_HEADER_LENGTH; 508 header.type = skb->protocol; 509 header.unused = 0; 510 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); 511 block_len = skb->len + 2; 512 *((__u16 *)skb_push(skb, 2)) = block_len; 513 514 /* 515 * IDAL support in CTCM is broken, so we have to 516 * care about skb's above 2G ourselves. 517 */ 518 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; 519 if (hi) { 520 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 521 if (!nskb) { 522 atomic_dec(&skb->users); 523 skb_pull(skb, LL_HEADER_LENGTH + 2); 524 ctcm_clear_busy(ch->netdev); 525 return -ENOMEM; 526 } else { 527 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 528 atomic_inc(&nskb->users); 529 atomic_dec(&skb->users); 530 dev_kfree_skb_irq(skb); 531 skb = nskb; 532 } 533 } 534 535 ch->ccw[4].count = block_len; 536 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 537 /* 538 * idal allocation failed, try via copying to 539 * trans_skb. trans_skb usually has a pre-allocated 540 * idal. 541 */ 542 if (ctcm_checkalloc_buffer(ch)) { 543 /* 544 * Remove our header. It gets added 545 * again on retransmit. 546 */ 547 atomic_dec(&skb->users); 548 skb_pull(skb, LL_HEADER_LENGTH + 2); 549 ctcm_clear_busy(ch->netdev); 550 return -ENOMEM; 551 } 552 553 skb_reset_tail_pointer(ch->trans_skb); 554 ch->trans_skb->len = 0; 555 ch->ccw[1].count = skb->len; 556 skb_copy_from_linear_data(skb, 557 skb_put(ch->trans_skb, skb->len), skb->len); 558 atomic_dec(&skb->users); 559 dev_kfree_skb_irq(skb); 560 ccw_idx = 0; 561 } else { 562 skb_queue_tail(&ch->io_queue, skb); 563 ccw_idx = 3; 564 } 565 if (do_debug_ccw) 566 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 567 sizeof(struct ccw1) * 3); 568 ch->retry = 0; 569 fsm_newstate(ch->fsm, CTC_STATE_TX); 570 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 572 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 573 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 574 (unsigned long)ch, 0xff, 0); 575 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 576 if (ccw_idx == 3) 577 ch->prof.doios_single++; 578 if (rc != 0) { 579 fsm_deltimer(&ch->timer); 580 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 581 if (ccw_idx == 3) 582 skb_dequeue_tail(&ch->io_queue); 583 /* 584 * Remove our header. It gets added 585 * again on retransmit. 586 */ 587 skb_pull(skb, LL_HEADER_LENGTH + 2); 588 } else if (ccw_idx == 0) { 589 struct net_device *dev = ch->netdev; 590 struct ctcm_priv *priv = dev->ml_priv; 591 priv->stats.tx_packets++; 592 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 593 } 594done: 595 ctcm_clear_busy(ch->netdev); 596 return rc; 597} 598 599static void ctcmpc_send_sweep_req(struct channel *rch) 600{ 601 struct net_device *dev = rch->netdev; 602 struct ctcm_priv *priv; 603 struct mpc_group *grp; 604 struct th_sweep *header; 605 struct sk_buff *sweep_skb; 606 struct channel *ch; 607 /* int rc = 0; */ 608 609 priv = dev->ml_priv; 610 grp = priv->mpcg; 611 ch = priv->channel[CTCM_WRITE]; 612 613 /* sweep processing is not complete until response and request */ 614 /* has completed for all read channels in group */ 615 if (grp->in_sweep == 0) { 616 grp->in_sweep = 1; 617 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 618 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 619 } 620 621 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 622 623 if (sweep_skb == NULL) { 624 /* rc = -ENOMEM; */ 625 goto nomem; 626 } 627 628 header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); 629 630 if (!header) { 631 dev_kfree_skb_any(sweep_skb); 632 /* rc = -ENOMEM; */ 633 goto nomem; 634 } 635 636 header->th.th_seg = 0x00 ; 637 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ 638 header->th.th_blk_flag = 0x00; 639 header->th.th_is_xid = 0x00; 640 header->th.th_seq_num = 0x00; 641 header->sw.th_last_seq = ch->th_seq_num; 642 643 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 644 645 kfree(header); 646 647 dev->trans_start = jiffies; 648 skb_queue_tail(&ch->sweep_queue, sweep_skb); 649 650 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 651 652 return; 653 654nomem: 655 grp->in_sweep = 0; 656 ctcm_clear_busy(dev); 657 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 658 659 return; 660} 661 662/* 663 * MPC mode version of transmit_skb 664 */ 665static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) 666{ 667 struct pdu *p_header; 668 struct net_device *dev = ch->netdev; 669 struct ctcm_priv *priv = dev->ml_priv; 670 struct mpc_group *grp = priv->mpcg; 671 struct th_header *header; 672 struct sk_buff *nskb; 673 int rc = 0; 674 int ccw_idx; 675 unsigned long hi; 676 unsigned long saveflags = 0; /* avoids compiler warning */ 677 678 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", 679 __func__, dev->name, smp_processor_id(), ch, 680 ch->id, fsm_getstate_str(ch->fsm)); 681 682 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { 683 spin_lock_irqsave(&ch->collect_lock, saveflags); 684 atomic_inc(&skb->users); 685 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 686 687 if (!p_header) { 688 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 689 goto nomem_exit; 690 } 691 692 p_header->pdu_offset = skb->len; 693 p_header->pdu_proto = 0x01; 694 p_header->pdu_flag = 0x00; 695 if (skb->protocol == ntohs(ETH_P_SNAP)) { 696 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 697 } else { 698 p_header->pdu_flag |= PDU_FIRST; 699 } 700 p_header->pdu_seq = 0; 701 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, 702 PDU_HEADER_LENGTH); 703 704 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" 705 "pdu header and data for up to 32 bytes:\n", 706 __func__, dev->name, skb->len); 707 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 708 709 skb_queue_tail(&ch->collect_queue, skb); 710 ch->collect_len += skb->len; 711 kfree(p_header); 712 713 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 714 goto done; 715 } 716 717 /* 718 * Protect skb against beeing free'd by upper 719 * layers. 720 */ 721 atomic_inc(&skb->users); 722 723 /* 724 * IDAL support in CTCM is broken, so we have to 725 * care about skb's above 2G ourselves. 726 */ 727 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 728 if (hi) { 729 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 730 if (!nskb) { 731 goto nomem_exit; 732 } else { 733 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 734 atomic_inc(&nskb->users); 735 atomic_dec(&skb->users); 736 dev_kfree_skb_irq(skb); 737 skb = nskb; 738 } 739 } 740 741 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 742 743 if (!p_header) 744 goto nomem_exit; 745 746 p_header->pdu_offset = skb->len; 747 p_header->pdu_proto = 0x01; 748 p_header->pdu_flag = 0x00; 749 p_header->pdu_seq = 0; 750 if (skb->protocol == ntohs(ETH_P_SNAP)) { 751 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 752 } else { 753 p_header->pdu_flag |= PDU_FIRST; 754 } 755 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); 756 757 kfree(p_header); 758 759 if (ch->collect_len > 0) { 760 spin_lock_irqsave(&ch->collect_lock, saveflags); 761 skb_queue_tail(&ch->collect_queue, skb); 762 ch->collect_len += skb->len; 763 skb = skb_dequeue(&ch->collect_queue); 764 ch->collect_len -= skb->len; 765 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 766 } 767 768 p_header = (struct pdu *)skb->data; 769 p_header->pdu_flag |= PDU_LAST; 770 771 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 772 773 header = kmalloc(TH_HEADER_LENGTH, gfp_type()); 774 if (!header) 775 goto nomem_exit; 776 777 header->th_seg = 0x00; 778 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 779 header->th_blk_flag = 0x00; 780 header->th_is_xid = 0x00; /* Just data here */ 781 ch->th_seq_num++; 782 header->th_seq_num = ch->th_seq_num; 783 784 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 785 __func__, dev->name, ch->th_seq_num); 786 787 /* put the TH on the packet */ 788 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); 789 790 kfree(header); 791 792 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 793 "up to 32 bytes sent to vtam:\n", 794 __func__, dev->name, skb->len); 795 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 796 797 ch->ccw[4].count = skb->len; 798 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 799 /* 800 * idal allocation failed, try via copying to trans_skb. 801 * trans_skb usually has a pre-allocated idal. 802 */ 803 if (ctcm_checkalloc_buffer(ch)) { 804 /* 805 * Remove our header. 806 * It gets added again on retransmit. 807 */ 808 goto nomem_exit; 809 } 810 811 skb_reset_tail_pointer(ch->trans_skb); 812 ch->trans_skb->len = 0; 813 ch->ccw[1].count = skb->len; 814 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); 815 atomic_dec(&skb->users); 816 dev_kfree_skb_irq(skb); 817 ccw_idx = 0; 818 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 819 "up to 32 bytes sent to vtam:\n", 820 __func__, dev->name, ch->trans_skb->len); 821 CTCM_D3_DUMP((char *)ch->trans_skb->data, 822 min_t(int, 32, ch->trans_skb->len)); 823 } else { 824 skb_queue_tail(&ch->io_queue, skb); 825 ccw_idx = 3; 826 } 827 ch->retry = 0; 828 fsm_newstate(ch->fsm, CTC_STATE_TX); 829 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 830 831 if (do_debug_ccw) 832 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 833 sizeof(struct ccw1) * 3); 834 835 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 836 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 837 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 838 (unsigned long)ch, 0xff, 0); 839 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 840 if (ccw_idx == 3) 841 ch->prof.doios_single++; 842 if (rc != 0) { 843 fsm_deltimer(&ch->timer); 844 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 845 if (ccw_idx == 3) 846 skb_dequeue_tail(&ch->io_queue); 847 } else if (ccw_idx == 0) { 848 priv->stats.tx_packets++; 849 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 850 } 851 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 852 ctcmpc_send_sweep_req(ch); 853 854 goto done; 855nomem_exit: 856 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 857 "%s(%s): MEMORY allocation ERROR\n", 858 CTCM_FUNTAIL, ch->id); 859 rc = -ENOMEM; 860 atomic_dec(&skb->users); 861 dev_kfree_skb_any(skb); 862 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 863done: 864 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 865 return rc; 866} 867 868/** 869 * Start transmission of a packet. 870 * Called from generic network device layer. 871 * 872 * skb Pointer to buffer containing the packet. 873 * dev Pointer to interface struct. 874 * 875 * returns 0 if packet consumed, !0 if packet rejected. 876 * Note: If we return !0, then the packet is free'd by 877 * the generic network layer. 878 */ 879/* first merge version - leaving both functions separated */ 880static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) 881{ 882 struct ctcm_priv *priv = dev->ml_priv; 883 884 if (skb == NULL) { 885 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 886 "%s(%s): NULL sk_buff passed", 887 CTCM_FUNTAIL, dev->name); 888 priv->stats.tx_dropped++; 889 return NETDEV_TX_OK; 890 } 891 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 892 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 893 "%s(%s): Got sk_buff with head room < %ld bytes", 894 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 895 dev_kfree_skb(skb); 896 priv->stats.tx_dropped++; 897 return NETDEV_TX_OK; 898 } 899 900 /* 901 * If channels are not running, try to restart them 902 * and throw away packet. 903 */ 904 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 905 fsm_event(priv->fsm, DEV_EVENT_START, dev); 906 dev_kfree_skb(skb); 907 priv->stats.tx_dropped++; 908 priv->stats.tx_errors++; 909 priv->stats.tx_carrier_errors++; 910 return NETDEV_TX_OK; 911 } 912 913 if (ctcm_test_and_set_busy(dev)) 914 return NETDEV_TX_BUSY; 915 916 dev->trans_start = jiffies; 917 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 918 return NETDEV_TX_BUSY; 919 return NETDEV_TX_OK; 920} 921 922/* unmerged MPC variant of ctcm_tx */ 923static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 924{ 925 int len = 0; 926 struct ctcm_priv *priv = dev->ml_priv; 927 struct mpc_group *grp = priv->mpcg; 928 struct sk_buff *newskb = NULL; 929 930 /* 931 * Some sanity checks ... 932 */ 933 if (skb == NULL) { 934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 935 "%s(%s): NULL sk_buff passed", 936 CTCM_FUNTAIL, dev->name); 937 priv->stats.tx_dropped++; 938 goto done; 939 } 940 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 941 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 942 "%s(%s): Got sk_buff with head room < %ld bytes", 943 CTCM_FUNTAIL, dev->name, 944 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 945 946 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 947 948 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 949 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 950 951 if (!newskb) { 952 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 953 "%s: %s: __dev_alloc_skb failed", 954 __func__, dev->name); 955 956 dev_kfree_skb_any(skb); 957 priv->stats.tx_dropped++; 958 priv->stats.tx_errors++; 959 priv->stats.tx_carrier_errors++; 960 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 961 goto done; 962 } 963 newskb->protocol = skb->protocol; 964 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 965 memcpy(skb_put(newskb, skb->len), skb->data, skb->len); 966 dev_kfree_skb_any(skb); 967 skb = newskb; 968 } 969 970 /* 971 * If channels are not running, 972 * notify anybody about a link failure and throw 973 * away packet. 974 */ 975 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 976 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 977 dev_kfree_skb_any(skb); 978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 979 "%s(%s): inactive MPCGROUP - dropped", 980 CTCM_FUNTAIL, dev->name); 981 priv->stats.tx_dropped++; 982 priv->stats.tx_errors++; 983 priv->stats.tx_carrier_errors++; 984 goto done; 985 } 986 987 if (ctcm_test_and_set_busy(dev)) { 988 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 989 "%s(%s): device busy - dropped", 990 CTCM_FUNTAIL, dev->name); 991 dev_kfree_skb_any(skb); 992 priv->stats.tx_dropped++; 993 priv->stats.tx_errors++; 994 priv->stats.tx_carrier_errors++; 995 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 996 goto done; 997 } 998 999 dev->trans_start = jiffies; 1000 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 1001 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1002 "%s(%s): device error - dropped", 1003 CTCM_FUNTAIL, dev->name); 1004 dev_kfree_skb_any(skb); 1005 priv->stats.tx_dropped++; 1006 priv->stats.tx_errors++; 1007 priv->stats.tx_carrier_errors++; 1008 ctcm_clear_busy(dev); 1009 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1010 goto done; 1011 } 1012 ctcm_clear_busy(dev); 1013done: 1014 if (do_debug) 1015 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1016 1017 return NETDEV_TX_OK; /* handle freeing of skb here */ 1018} 1019 1020 1021/** 1022 * Sets MTU of an interface. 1023 * 1024 * dev Pointer to interface struct. 1025 * new_mtu The new MTU to use for this interface. 1026 * 1027 * returns 0 on success, -EINVAL if MTU is out of valid range. 1028 * (valid range is 576 .. 65527). If VM is on the 1029 * remote side, maximum MTU is 32760, however this is 1030 * not checked here. 1031 */ 1032static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1033{ 1034 struct ctcm_priv *priv; 1035 int max_bufsize; 1036 1037 if (new_mtu < 576 || new_mtu > 65527) 1038 return -EINVAL; 1039 1040 priv = dev->ml_priv; 1041 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1042 1043 if (IS_MPC(priv)) { 1044 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1045 return -EINVAL; 1046 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1047 } else { 1048 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1049 return -EINVAL; 1050 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1051 } 1052 dev->mtu = new_mtu; 1053 return 0; 1054} 1055 1056/** 1057 * Returns interface statistics of a device. 1058 * 1059 * dev Pointer to interface struct. 1060 * 1061 * returns Pointer to stats struct of this interface. 1062 */ 1063static struct net_device_stats *ctcm_stats(struct net_device *dev) 1064{ 1065 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1066} 1067 1068static void ctcm_free_netdevice(struct net_device *dev) 1069{ 1070 struct ctcm_priv *priv; 1071 struct mpc_group *grp; 1072 1073 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1074 "%s(%s)", CTCM_FUNTAIL, dev->name); 1075 priv = dev->ml_priv; 1076 if (priv) { 1077 grp = priv->mpcg; 1078 if (grp) { 1079 if (grp->fsm) 1080 kfree_fsm(grp->fsm); 1081 if (grp->xid_skb) 1082 dev_kfree_skb(grp->xid_skb); 1083 if (grp->rcvd_xid_skb) 1084 dev_kfree_skb(grp->rcvd_xid_skb); 1085 tasklet_kill(&grp->mpc_tasklet2); 1086 kfree(grp); 1087 priv->mpcg = NULL; 1088 } 1089 if (priv->fsm) { 1090 kfree_fsm(priv->fsm); 1091 priv->fsm = NULL; 1092 } 1093 kfree(priv->xid); 1094 priv->xid = NULL; 1095 /* 1096 * Note: kfree(priv); is done in "opposite" function of 1097 * allocator function probe_device which is remove_device. 1098 */ 1099 } 1100#ifdef MODULE 1101 free_netdev(dev); 1102#endif 1103} 1104 1105struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1106 1107static const struct net_device_ops ctcm_netdev_ops = { 1108 .ndo_open = ctcm_open, 1109 .ndo_stop = ctcm_close, 1110 .ndo_get_stats = ctcm_stats, 1111 .ndo_change_mtu = ctcm_change_mtu, 1112 .ndo_start_xmit = ctcm_tx, 1113}; 1114 1115static const struct net_device_ops ctcm_mpc_netdev_ops = { 1116 .ndo_open = ctcm_open, 1117 .ndo_stop = ctcm_close, 1118 .ndo_get_stats = ctcm_stats, 1119 .ndo_change_mtu = ctcm_change_mtu, 1120 .ndo_start_xmit = ctcmpc_tx, 1121}; 1122 1123void static ctcm_dev_setup(struct net_device *dev) 1124{ 1125 dev->type = ARPHRD_SLIP; 1126 dev->tx_queue_len = 100; 1127 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1128} 1129 1130/* 1131 * Initialize everything of the net device except the name and the 1132 * channel structs. 1133 */ 1134static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1135{ 1136 struct net_device *dev; 1137 struct mpc_group *grp; 1138 if (!priv) 1139 return NULL; 1140 1141 if (IS_MPC(priv)) 1142 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); 1143 else 1144 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); 1145 1146 if (!dev) { 1147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1148 "%s: MEMORY allocation ERROR", 1149 CTCM_FUNTAIL); 1150 return NULL; 1151 } 1152 dev->ml_priv = priv; 1153 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1154 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1155 dev_fsm, dev_fsm_len, GFP_KERNEL); 1156 if (priv->fsm == NULL) { 1157 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1158 free_netdev(dev); 1159 return NULL; 1160 } 1161 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1162 fsm_settimer(priv->fsm, &priv->restart_timer); 1163 1164 if (IS_MPC(priv)) { 1165 /* MPC Group Initializations */ 1166 grp = ctcmpc_init_mpc_group(priv); 1167 if (grp == NULL) { 1168 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1169 free_netdev(dev); 1170 return NULL; 1171 } 1172 tasklet_init(&grp->mpc_tasklet2, 1173 mpc_group_ready, (unsigned long)dev); 1174 dev->mtu = MPC_BUFSIZE_DEFAULT - 1175 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1176 1177 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1178 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1179 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1180 } else { 1181 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1182 dev->netdev_ops = &ctcm_netdev_ops; 1183 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1184 } 1185 1186 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1187 1188 return dev; 1189} 1190 1191/** 1192 * Main IRQ handler. 1193 * 1194 * cdev The ccw_device the interrupt is for. 1195 * intparm interruption parameter. 1196 * irb interruption response block. 1197 */ 1198static void ctcm_irq_handler(struct ccw_device *cdev, 1199 unsigned long intparm, struct irb *irb) 1200{ 1201 struct channel *ch; 1202 struct net_device *dev; 1203 struct ctcm_priv *priv; 1204 struct ccwgroup_device *cgdev; 1205 int cstat; 1206 int dstat; 1207 1208 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1209 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); 1210 1211 if (ctcm_check_irb_error(cdev, irb)) 1212 return; 1213 1214 cgdev = dev_get_drvdata(&cdev->dev); 1215 1216 cstat = irb->scsw.cmd.cstat; 1217 dstat = irb->scsw.cmd.dstat; 1218 1219 /* Check for unsolicited interrupts. */ 1220 if (cgdev == NULL) { 1221 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, 1222 "%s(%s) unsolicited irq: c-%02x d-%02x\n", 1223 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); 1224 dev_warn(&cdev->dev, 1225 "The adapter received a non-specific IRQ\n"); 1226 return; 1227 } 1228 1229 priv = dev_get_drvdata(&cgdev->dev); 1230 1231 /* Try to extract channel from driver data. */ 1232 if (priv->channel[CTCM_READ]->cdev == cdev) 1233 ch = priv->channel[CTCM_READ]; 1234 else if (priv->channel[CTCM_WRITE]->cdev == cdev) 1235 ch = priv->channel[CTCM_WRITE]; 1236 else { 1237 dev_err(&cdev->dev, 1238 "%s: Internal error: Can't determine channel for " 1239 "interrupt device %s\n", 1240 __func__, dev_name(&cdev->dev)); 1241 /* Explain: inconsistent internal structures */ 1242 return; 1243 } 1244 1245 dev = ch->netdev; 1246 if (dev == NULL) { 1247 dev_err(&cdev->dev, 1248 "%s Internal error: net_device is NULL, ch = 0x%p\n", 1249 __func__, ch); 1250 /* Explain: inconsistent internal structures */ 1251 return; 1252 } 1253 1254 /* Copy interruption response block. */ 1255 memcpy(ch->irb, irb, sizeof(struct irb)); 1256 1257 /* Issue error message and return on subchannel error code */ 1258 if (irb->scsw.cmd.cstat) { 1259 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); 1260 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1261 "%s(%s): sub-ch check %s: cs=%02x ds=%02x", 1262 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); 1263 dev_warn(&cdev->dev, 1264 "A check occurred on the subchannel\n"); 1265 return; 1266 } 1267 1268 /* Check the reason-code of a unit check */ 1269 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 1270 if ((irb->ecw[0] & ch->sense_rc) == 0) 1271 /* print it only once */ 1272 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1273 "%s(%s): sense=%02x, ds=%02x", 1274 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); 1275 ccw_unit_check(ch, irb->ecw[0]); 1276 return; 1277 } 1278 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { 1279 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) 1280 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); 1281 else 1282 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); 1283 return; 1284 } 1285 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 1286 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); 1287 return; 1288 } 1289 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || 1290 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || 1291 (irb->scsw.cmd.stctl == 1292 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) 1293 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); 1294 else 1295 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); 1296 1297} 1298 1299/** 1300 * Add ctcm specific attributes. 1301 * Add ctcm private data. 1302 * 1303 * cgdev pointer to ccwgroup_device just added 1304 * 1305 * returns 0 on success, !0 on failure. 1306 */ 1307static int ctcm_probe_device(struct ccwgroup_device *cgdev) 1308{ 1309 struct ctcm_priv *priv; 1310 int rc; 1311 1312 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1313 "%s %p", 1314 __func__, cgdev); 1315 1316 if (!get_device(&cgdev->dev)) 1317 return -ENODEV; 1318 1319 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); 1320 if (!priv) { 1321 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1322 "%s: memory allocation failure", 1323 CTCM_FUNTAIL); 1324 put_device(&cgdev->dev); 1325 return -ENOMEM; 1326 } 1327 1328 rc = ctcm_add_files(&cgdev->dev); 1329 if (rc) { 1330 kfree(priv); 1331 put_device(&cgdev->dev); 1332 return rc; 1333 } 1334 priv->buffer_size = CTCM_BUFSIZE_DEFAULT; 1335 cgdev->cdev[0]->handler = ctcm_irq_handler; 1336 cgdev->cdev[1]->handler = ctcm_irq_handler; 1337 dev_set_drvdata(&cgdev->dev, priv); 1338 1339 return 0; 1340} 1341 1342/** 1343 * Add a new channel to the list of channels. 1344 * Keeps the channel list sorted. 1345 * 1346 * cdev The ccw_device to be added. 1347 * type The type class of the new channel. 1348 * priv Points to the private data of the ccwgroup_device. 1349 * 1350 * returns 0 on success, !0 on error. 1351 */ 1352static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, 1353 struct ctcm_priv *priv) 1354{ 1355 struct channel **c = &channels; 1356 struct channel *ch; 1357 int ccw_num; 1358 int rc = 0; 1359 1360 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1361 "%s(%s), type %d, proto %d", 1362 __func__, dev_name(&cdev->dev), type, priv->protocol); 1363 1364 ch = kzalloc(sizeof(struct channel), GFP_KERNEL); 1365 if (ch == NULL) 1366 return -ENOMEM; 1367 1368 ch->protocol = priv->protocol; 1369 if (IS_MPC(priv)) { 1370 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1371 if (ch->discontact_th == NULL) 1372 goto nomem_return; 1373 1374 ch->discontact_th->th_blk_flag = TH_DISCONTACT; 1375 tasklet_init(&ch->ch_disc_tasklet, 1376 mpc_action_send_discontact, (unsigned long)ch); 1377 1378 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); 1379 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); 1380 ccw_num = 17; 1381 } else 1382 ccw_num = 8; 1383 1384 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); 1385 if (ch->ccw == NULL) 1386 goto nomem_return; 1387 1388 ch->cdev = cdev; 1389 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); 1390 ch->type = type; 1391 1392 /** 1393 * "static" ccws are used in the following way: 1394 * 1395 * ccw[0..2] (Channel program for generic I/O): 1396 * 0: prepare 1397 * 1: read or write (depending on direction) with fixed 1398 * buffer (idal allocated once when buffer is allocated) 1399 * 2: nop 1400 * ccw[3..5] (Channel program for direct write of packets) 1401 * 3: prepare 1402 * 4: write (idal allocated on every write). 1403 * 5: nop 1404 * ccw[6..7] (Channel program for initial channel setup): 1405 * 6: set extended mode 1406 * 7: nop 1407 * 1408 * ch->ccw[0..5] are initialized in ch_action_start because 1409 * the channel's direction is yet unknown here. 1410 * 1411 * ccws used for xid2 negotiations 1412 * ch-ccw[8-14] need to be used for the XID exchange either 1413 * X side XID2 Processing 1414 * 8: write control 1415 * 9: write th 1416 * 10: write XID 1417 * 11: read th from secondary 1418 * 12: read XID from secondary 1419 * 13: read 4 byte ID 1420 * 14: nop 1421 * Y side XID Processing 1422 * 8: sense 1423 * 9: read th 1424 * 10: read XID 1425 * 11: write th 1426 * 12: write XID 1427 * 13: write 4 byte ID 1428 * 14: nop 1429 * 1430 * ccws used for double noop due to VM timing issues 1431 * which result in unrecoverable Busy on channel 1432 * 15: nop 1433 * 16: nop 1434 */ 1435 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; 1436 ch->ccw[6].flags = CCW_FLAG_SLI; 1437 1438 ch->ccw[7].cmd_code = CCW_CMD_NOOP; 1439 ch->ccw[7].flags = CCW_FLAG_SLI; 1440 1441 if (IS_MPC(priv)) { 1442 ch->ccw[15].cmd_code = CCW_CMD_WRITE; 1443 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1444 ch->ccw[15].count = TH_HEADER_LENGTH; 1445 ch->ccw[15].cda = virt_to_phys(ch->discontact_th); 1446 1447 ch->ccw[16].cmd_code = CCW_CMD_NOOP; 1448 ch->ccw[16].flags = CCW_FLAG_SLI; 1449 1450 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1451 ctc_ch_event_names, CTC_MPC_NR_STATES, 1452 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, 1453 mpc_ch_fsm_len, GFP_KERNEL); 1454 } else { 1455 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1456 ctc_ch_event_names, CTC_NR_STATES, 1457 CTC_NR_EVENTS, ch_fsm, 1458 ch_fsm_len, GFP_KERNEL); 1459 } 1460 if (ch->fsm == NULL) 1461 goto free_return; 1462 1463 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 1464 1465 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); 1466 if (ch->irb == NULL) 1467 goto nomem_return; 1468 1469 while (*c && ctcm_less_than((*c)->id, ch->id)) 1470 c = &(*c)->next; 1471 1472 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { 1473 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1474 "%s (%s) already in list, using old entry", 1475 __func__, (*c)->id); 1476 1477 goto free_return; 1478 } 1479 1480 spin_lock_init(&ch->collect_lock); 1481 1482 fsm_settimer(ch->fsm, &ch->timer); 1483 skb_queue_head_init(&ch->io_queue); 1484 skb_queue_head_init(&ch->collect_queue); 1485 1486 if (IS_MPC(priv)) { 1487 fsm_settimer(ch->fsm, &ch->sweep_timer); 1488 skb_queue_head_init(&ch->sweep_queue); 1489 } 1490 ch->next = *c; 1491 *c = ch; 1492 return 0; 1493 1494nomem_return: 1495 rc = -ENOMEM; 1496 1497free_return: /* note that all channel pointers are 0 or valid */ 1498 kfree(ch->ccw); 1499 kfree(ch->discontact_th); 1500 kfree_fsm(ch->fsm); 1501 kfree(ch->irb); 1502 kfree(ch); 1503 return rc; 1504} 1505 1506/* 1507 * Return type of a detected device. 1508 */ 1509static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) 1510{ 1511 enum ctcm_channel_types type; 1512 type = (enum ctcm_channel_types)id->driver_info; 1513 1514 if (type == ctcm_channel_type_ficon) 1515 type = ctcm_channel_type_escon; 1516 1517 return type; 1518} 1519 1520/** 1521 * 1522 * Setup an interface. 1523 * 1524 * cgdev Device to be setup. 1525 * 1526 * returns 0 on success, !0 on failure. 1527 */ 1528static int ctcm_new_device(struct ccwgroup_device *cgdev) 1529{ 1530 char read_id[CTCM_ID_SIZE]; 1531 char write_id[CTCM_ID_SIZE]; 1532 int direction; 1533 enum ctcm_channel_types type; 1534 struct ctcm_priv *priv; 1535 struct net_device *dev; 1536 struct ccw_device *cdev0; 1537 struct ccw_device *cdev1; 1538 struct channel *readc; 1539 struct channel *writec; 1540 int ret; 1541 int result; 1542 1543 priv = dev_get_drvdata(&cgdev->dev); 1544 if (!priv) { 1545 result = -ENODEV; 1546 goto out_err_result; 1547 } 1548 1549 cdev0 = cgdev->cdev[0]; 1550 cdev1 = cgdev->cdev[1]; 1551 1552 type = get_channel_type(&cdev0->id); 1553 1554 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); 1555 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); 1556 1557 ret = add_channel(cdev0, type, priv); 1558 if (ret) { 1559 result = ret; 1560 goto out_err_result; 1561 } 1562 ret = add_channel(cdev1, type, priv); 1563 if (ret) { 1564 result = ret; 1565 goto out_remove_channel1; 1566 } 1567 1568 ret = ccw_device_set_online(cdev0); 1569 if (ret != 0) { 1570 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1571 "%s(%s) set_online rc=%d", 1572 CTCM_FUNTAIL, read_id, ret); 1573 result = -EIO; 1574 goto out_remove_channel2; 1575 } 1576 1577 ret = ccw_device_set_online(cdev1); 1578 if (ret != 0) { 1579 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1580 "%s(%s) set_online rc=%d", 1581 CTCM_FUNTAIL, write_id, ret); 1582 1583 result = -EIO; 1584 goto out_ccw1; 1585 } 1586 1587 dev = ctcm_init_netdevice(priv); 1588 if (dev == NULL) { 1589 result = -ENODEV; 1590 goto out_ccw2; 1591 } 1592 1593 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1594 priv->channel[direction] = 1595 channel_get(type, direction == CTCM_READ ? 1596 read_id : write_id, direction); 1597 if (priv->channel[direction] == NULL) { 1598 if (direction == CTCM_WRITE) 1599 channel_free(priv->channel[CTCM_READ]); 1600 goto out_dev; 1601 } 1602 priv->channel[direction]->netdev = dev; 1603 priv->channel[direction]->protocol = priv->protocol; 1604 priv->channel[direction]->max_bufsize = priv->buffer_size; 1605 } 1606 /* sysfs magic */ 1607 SET_NETDEV_DEV(dev, &cgdev->dev); 1608 1609 if (register_netdev(dev)) { 1610 result = -ENODEV; 1611 goto out_dev; 1612 } 1613 1614 if (ctcm_add_attributes(&cgdev->dev)) { 1615 result = -ENODEV; 1616 goto out_unregister; 1617 } 1618 1619 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1620 1621 dev_info(&dev->dev, 1622 "setup OK : r/w = %s/%s, protocol : %d\n", 1623 priv->channel[CTCM_READ]->id, 1624 priv->channel[CTCM_WRITE]->id, priv->protocol); 1625 1626 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1627 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1628 priv->channel[CTCM_READ]->id, 1629 priv->channel[CTCM_WRITE]->id, priv->protocol); 1630 1631 return 0; 1632out_unregister: 1633 unregister_netdev(dev); 1634out_dev: 1635 ctcm_free_netdevice(dev); 1636out_ccw2: 1637 ccw_device_set_offline(cgdev->cdev[1]); 1638out_ccw1: 1639 ccw_device_set_offline(cgdev->cdev[0]); 1640out_remove_channel2: 1641 readc = channel_get(type, read_id, CTCM_READ); 1642 channel_remove(readc); 1643out_remove_channel1: 1644 writec = channel_get(type, write_id, CTCM_WRITE); 1645 channel_remove(writec); 1646out_err_result: 1647 return result; 1648} 1649 1650/** 1651 * Shutdown an interface. 1652 * 1653 * cgdev Device to be shut down. 1654 * 1655 * returns 0 on success, !0 on failure. 1656 */ 1657static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1658{ 1659 struct ctcm_priv *priv; 1660 struct net_device *dev; 1661 1662 priv = dev_get_drvdata(&cgdev->dev); 1663 if (!priv) 1664 return -ENODEV; 1665 1666 if (priv->channel[CTCM_READ]) { 1667 dev = priv->channel[CTCM_READ]->netdev; 1668 CTCM_DBF_DEV(SETUP, dev, ""); 1669 /* Close the device */ 1670 ctcm_close(dev); 1671 dev->flags &= ~IFF_RUNNING; 1672 ctcm_remove_attributes(&cgdev->dev); 1673 channel_free(priv->channel[CTCM_READ]); 1674 } else 1675 dev = NULL; 1676 1677 if (priv->channel[CTCM_WRITE]) 1678 channel_free(priv->channel[CTCM_WRITE]); 1679 1680 if (dev) { 1681 unregister_netdev(dev); 1682 ctcm_free_netdevice(dev); 1683 } 1684 1685 if (priv->fsm) 1686 kfree_fsm(priv->fsm); 1687 1688 ccw_device_set_offline(cgdev->cdev[1]); 1689 ccw_device_set_offline(cgdev->cdev[0]); 1690 1691 if (priv->channel[CTCM_READ]) 1692 channel_remove(priv->channel[CTCM_READ]); 1693 if (priv->channel[CTCM_WRITE]) 1694 channel_remove(priv->channel[CTCM_WRITE]); 1695 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1696 1697 return 0; 1698 1699} 1700 1701 1702static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1703{ 1704 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1705 1706 BUG_ON(priv == NULL); 1707 1708 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1709 "removing device %p, proto : %d", 1710 cgdev, priv->protocol); 1711 1712 if (cgdev->state == CCWGROUP_ONLINE) 1713 ctcm_shutdown_device(cgdev); 1714 ctcm_remove_files(&cgdev->dev); 1715 dev_set_drvdata(&cgdev->dev, NULL); 1716 kfree(priv); 1717 put_device(&cgdev->dev); 1718} 1719 1720static int ctcm_pm_suspend(struct ccwgroup_device *gdev) 1721{ 1722 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1723 1724 if (gdev->state == CCWGROUP_OFFLINE) 1725 return 0; 1726 netif_device_detach(priv->channel[CTCM_READ]->netdev); 1727 ctcm_close(priv->channel[CTCM_READ]->netdev); 1728 if (!wait_event_timeout(priv->fsm->wait_q, 1729 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { 1730 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1731 return -EBUSY; 1732 } 1733 ccw_device_set_offline(gdev->cdev[1]); 1734 ccw_device_set_offline(gdev->cdev[0]); 1735 return 0; 1736} 1737 1738static int ctcm_pm_resume(struct ccwgroup_device *gdev) 1739{ 1740 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1741 int rc; 1742 1743 if (gdev->state == CCWGROUP_OFFLINE) 1744 return 0; 1745 rc = ccw_device_set_online(gdev->cdev[1]); 1746 if (rc) 1747 goto err_out; 1748 rc = ccw_device_set_online(gdev->cdev[0]); 1749 if (rc) 1750 goto err_out; 1751 ctcm_open(priv->channel[CTCM_READ]->netdev); 1752err_out: 1753 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1754 return rc; 1755} 1756 1757static struct ccw_device_id ctcm_ids[] = { 1758 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1759 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1760 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1761 {}, 1762}; 1763MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1764 1765static struct ccw_driver ctcm_ccw_driver = { 1766 .driver = { 1767 .owner = THIS_MODULE, 1768 .name = "ctcm", 1769 }, 1770 .ids = ctcm_ids, 1771 .probe = ccwgroup_probe_ccwdev, 1772 .remove = ccwgroup_remove_ccwdev, 1773 .int_class = IOINT_CTC, 1774}; 1775 1776static struct ccwgroup_driver ctcm_group_driver = { 1777 .driver = { 1778 .owner = THIS_MODULE, 1779 .name = CTC_DRIVER_NAME, 1780 }, 1781 .max_slaves = 2, 1782 .driver_id = 0xC3E3C3D4, /* CTCM */ 1783 .probe = ctcm_probe_device, 1784 .remove = ctcm_remove_device, 1785 .set_online = ctcm_new_device, 1786 .set_offline = ctcm_shutdown_device, 1787 .freeze = ctcm_pm_suspend, 1788 .thaw = ctcm_pm_resume, 1789 .restore = ctcm_pm_resume, 1790}; 1791 1792static ssize_t 1793ctcm_driver_group_store(struct device_driver *ddrv, const char *buf, 1794 size_t count) 1795{ 1796 int err; 1797 1798 err = ccwgroup_create_from_string(ctcm_root_dev, 1799 ctcm_group_driver.driver_id, 1800 &ctcm_ccw_driver, 2, buf); 1801 return err ? err : count; 1802} 1803 1804static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store); 1805 1806static struct attribute *ctcm_group_attrs[] = { 1807 &driver_attr_group.attr, 1808 NULL, 1809}; 1810 1811static struct attribute_group ctcm_group_attr_group = { 1812 .attrs = ctcm_group_attrs, 1813}; 1814 1815static const struct attribute_group *ctcm_group_attr_groups[] = { 1816 &ctcm_group_attr_group, 1817 NULL, 1818}; 1819 1820/* 1821 * Module related routines 1822 */ 1823 1824/* 1825 * Prepare to be unloaded. Free IRQ's and release all resources. 1826 * This is called just before this module is unloaded. It is 1827 * not called, if the usage count is !0, so we don't need to check 1828 * for that. 1829 */ 1830static void __exit ctcm_exit(void) 1831{ 1832 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group); 1833 ccwgroup_driver_unregister(&ctcm_group_driver); 1834 ccw_driver_unregister(&ctcm_ccw_driver); 1835 root_device_unregister(ctcm_root_dev); 1836 ctcm_unregister_dbf_views(); 1837 pr_info("CTCM driver unloaded\n"); 1838} 1839 1840/* 1841 * Print Banner. 1842 */ 1843static void print_banner(void) 1844{ 1845 pr_info("CTCM driver initialized\n"); 1846} 1847 1848/** 1849 * Initialize module. 1850 * This is called just after the module is loaded. 1851 * 1852 * returns 0 on success, !0 on error. 1853 */ 1854static int __init ctcm_init(void) 1855{ 1856 int ret; 1857 1858 channels = NULL; 1859 1860 ret = ctcm_register_dbf_views(); 1861 if (ret) 1862 goto out_err; 1863 ctcm_root_dev = root_device_register("ctcm"); 1864 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0; 1865 if (ret) 1866 goto register_err; 1867 ret = ccw_driver_register(&ctcm_ccw_driver); 1868 if (ret) 1869 goto ccw_err; 1870 ctcm_group_driver.driver.groups = ctcm_group_attr_groups; 1871 ret = ccwgroup_driver_register(&ctcm_group_driver); 1872 if (ret) 1873 goto ccwgroup_err; 1874 print_banner(); 1875 return 0; 1876 1877ccwgroup_err: 1878 ccw_driver_unregister(&ctcm_ccw_driver); 1879ccw_err: 1880 root_device_unregister(ctcm_root_dev); 1881register_err: 1882 ctcm_unregister_dbf_views(); 1883out_err: 1884 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1885 __func__, ret); 1886 return ret; 1887} 1888 1889module_init(ctcm_init); 1890module_exit(ctcm_exit); 1891 1892MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1893MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1894MODULE_LICENSE("GPL"); 1895 1896