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 ch->retry = 0; 566 fsm_newstate(ch->fsm, CTC_STATE_TX); 567 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 568 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 569 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 570 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 571 (unsigned long)ch, 0xff, 0); 572 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 573 if (ccw_idx == 3) 574 ch->prof.doios_single++; 575 if (rc != 0) { 576 fsm_deltimer(&ch->timer); 577 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 578 if (ccw_idx == 3) 579 skb_dequeue_tail(&ch->io_queue); 580 /* 581 * Remove our header. It gets added 582 * again on retransmit. 583 */ 584 skb_pull(skb, LL_HEADER_LENGTH + 2); 585 } else if (ccw_idx == 0) { 586 struct net_device *dev = ch->netdev; 587 struct ctcm_priv *priv = dev->ml_priv; 588 priv->stats.tx_packets++; 589 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 590 } 591done: 592 ctcm_clear_busy(ch->netdev); 593 return rc; 594} 595 596static void ctcmpc_send_sweep_req(struct channel *rch) 597{ 598 struct net_device *dev = rch->netdev; 599 struct ctcm_priv *priv; 600 struct mpc_group *grp; 601 struct th_sweep *header; 602 struct sk_buff *sweep_skb; 603 struct channel *ch; 604 /* int rc = 0; */ 605 606 priv = dev->ml_priv; 607 grp = priv->mpcg; 608 ch = priv->channel[CTCM_WRITE]; 609 610 /* sweep processing is not complete until response and request */ 611 /* has completed for all read channels in group */ 612 if (grp->in_sweep == 0) { 613 grp->in_sweep = 1; 614 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 615 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 616 } 617 618 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 619 620 if (sweep_skb == NULL) { 621 /* rc = -ENOMEM; */ 622 goto nomem; 623 } 624 625 header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); 626 627 if (!header) { 628 dev_kfree_skb_any(sweep_skb); 629 /* rc = -ENOMEM; */ 630 goto nomem; 631 } 632 633 header->th.th_seg = 0x00 ; 634 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ 635 header->th.th_blk_flag = 0x00; 636 header->th.th_is_xid = 0x00; 637 header->th.th_seq_num = 0x00; 638 header->sw.th_last_seq = ch->th_seq_num; 639 640 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 641 642 kfree(header); 643 644 dev->trans_start = jiffies; 645 skb_queue_tail(&ch->sweep_queue, sweep_skb); 646 647 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 648 649 return; 650 651nomem: 652 grp->in_sweep = 0; 653 ctcm_clear_busy(dev); 654 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 655 656 return; 657} 658 659/* 660 * MPC mode version of transmit_skb 661 */ 662static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) 663{ 664 struct pdu *p_header; 665 struct net_device *dev = ch->netdev; 666 struct ctcm_priv *priv = dev->ml_priv; 667 struct mpc_group *grp = priv->mpcg; 668 struct th_header *header; 669 struct sk_buff *nskb; 670 int rc = 0; 671 int ccw_idx; 672 unsigned long hi; 673 unsigned long saveflags = 0; /* avoids compiler warning */ 674 __u16 block_len; 675 676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", 677 __func__, dev->name, smp_processor_id(), ch, 678 ch->id, fsm_getstate_str(ch->fsm)); 679 680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { 681 spin_lock_irqsave(&ch->collect_lock, saveflags); 682 atomic_inc(&skb->users); 683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 684 685 if (!p_header) { 686 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 687 goto nomem_exit; 688 } 689 690 p_header->pdu_offset = skb->len; 691 p_header->pdu_proto = 0x01; 692 p_header->pdu_flag = 0x00; 693 if (skb->protocol == ntohs(ETH_P_SNAP)) { 694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 695 } else { 696 p_header->pdu_flag |= PDU_FIRST; 697 } 698 p_header->pdu_seq = 0; 699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, 700 PDU_HEADER_LENGTH); 701 702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" 703 "pdu header and data for up to 32 bytes:\n", 704 __func__, dev->name, skb->len); 705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 706 707 skb_queue_tail(&ch->collect_queue, skb); 708 ch->collect_len += skb->len; 709 kfree(p_header); 710 711 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 712 goto done; 713 } 714 715 /* 716 * Protect skb against beeing free'd by upper 717 * layers. 718 */ 719 atomic_inc(&skb->users); 720 721 block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 722 /* 723 * IDAL support in CTCM is broken, so we have to 724 * care about skb's above 2G ourselves. 725 */ 726 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 727 if (hi) { 728 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 729 if (!nskb) { 730 goto nomem_exit; 731 } else { 732 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 733 atomic_inc(&nskb->users); 734 atomic_dec(&skb->users); 735 dev_kfree_skb_irq(skb); 736 skb = nskb; 737 } 738 } 739 740 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 741 742 if (!p_header) 743 goto nomem_exit; 744 745 p_header->pdu_offset = skb->len; 746 p_header->pdu_proto = 0x01; 747 p_header->pdu_flag = 0x00; 748 p_header->pdu_seq = 0; 749 if (skb->protocol == ntohs(ETH_P_SNAP)) { 750 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 751 } else { 752 p_header->pdu_flag |= PDU_FIRST; 753 } 754 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); 755 756 kfree(p_header); 757 758 if (ch->collect_len > 0) { 759 spin_lock_irqsave(&ch->collect_lock, saveflags); 760 skb_queue_tail(&ch->collect_queue, skb); 761 ch->collect_len += skb->len; 762 skb = skb_dequeue(&ch->collect_queue); 763 ch->collect_len -= skb->len; 764 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 765 } 766 767 p_header = (struct pdu *)skb->data; 768 p_header->pdu_flag |= PDU_LAST; 769 770 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 771 772 header = kmalloc(TH_HEADER_LENGTH, gfp_type()); 773 if (!header) 774 goto nomem_exit; 775 776 header->th_seg = 0x00; 777 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 778 header->th_blk_flag = 0x00; 779 header->th_is_xid = 0x00; /* Just data here */ 780 ch->th_seq_num++; 781 header->th_seq_num = ch->th_seq_num; 782 783 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 784 __func__, dev->name, ch->th_seq_num); 785 786 /* put the TH on the packet */ 787 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); 788 789 kfree(header); 790 791 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 792 "up to 32 bytes sent to vtam:\n", 793 __func__, dev->name, skb->len); 794 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 795 796 ch->ccw[4].count = skb->len; 797 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 798 /* 799 * idal allocation failed, try via copying to trans_skb. 800 * trans_skb usually has a pre-allocated idal. 801 */ 802 if (ctcm_checkalloc_buffer(ch)) { 803 /* 804 * Remove our header. 805 * It gets added again on retransmit. 806 */ 807 goto nomem_exit; 808 } 809 810 skb_reset_tail_pointer(ch->trans_skb); 811 ch->trans_skb->len = 0; 812 ch->ccw[1].count = skb->len; 813 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); 814 atomic_dec(&skb->users); 815 dev_kfree_skb_irq(skb); 816 ccw_idx = 0; 817 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 818 "up to 32 bytes sent to vtam:\n", 819 __func__, dev->name, ch->trans_skb->len); 820 CTCM_D3_DUMP((char *)ch->trans_skb->data, 821 min_t(int, 32, ch->trans_skb->len)); 822 } else { 823 skb_queue_tail(&ch->io_queue, skb); 824 ccw_idx = 3; 825 } 826 ch->retry = 0; 827 fsm_newstate(ch->fsm, CTC_STATE_TX); 828 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 829 830 if (do_debug_ccw) 831 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 832 sizeof(struct ccw1) * 3); 833 834 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 835 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 836 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 837 (unsigned long)ch, 0xff, 0); 838 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 839 if (ccw_idx == 3) 840 ch->prof.doios_single++; 841 if (rc != 0) { 842 fsm_deltimer(&ch->timer); 843 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 844 if (ccw_idx == 3) 845 skb_dequeue_tail(&ch->io_queue); 846 } else if (ccw_idx == 0) { 847 priv->stats.tx_packets++; 848 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 849 } 850 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 851 ctcmpc_send_sweep_req(ch); 852 853 goto done; 854nomem_exit: 855 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 856 "%s(%s): MEMORY allocation ERROR\n", 857 CTCM_FUNTAIL, ch->id); 858 rc = -ENOMEM; 859 atomic_dec(&skb->users); 860 dev_kfree_skb_any(skb); 861 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 862done: 863 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 864 return rc; 865} 866 867/** 868 * Start transmission of a packet. 869 * Called from generic network device layer. 870 * 871 * skb Pointer to buffer containing the packet. 872 * dev Pointer to interface struct. 873 * 874 * returns 0 if packet consumed, !0 if packet rejected. 875 * Note: If we return !0, then the packet is free'd by 876 * the generic network layer. 877 */ 878/* first merge version - leaving both functions separated */ 879static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) 880{ 881 struct ctcm_priv *priv = dev->ml_priv; 882 883 if (skb == NULL) { 884 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 885 "%s(%s): NULL sk_buff passed", 886 CTCM_FUNTAIL, dev->name); 887 priv->stats.tx_dropped++; 888 return NETDEV_TX_OK; 889 } 890 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 892 "%s(%s): Got sk_buff with head room < %ld bytes", 893 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 894 dev_kfree_skb(skb); 895 priv->stats.tx_dropped++; 896 return NETDEV_TX_OK; 897 } 898 899 /* 900 * If channels are not running, try to restart them 901 * and throw away packet. 902 */ 903 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 904 fsm_event(priv->fsm, DEV_EVENT_START, dev); 905 dev_kfree_skb(skb); 906 priv->stats.tx_dropped++; 907 priv->stats.tx_errors++; 908 priv->stats.tx_carrier_errors++; 909 return NETDEV_TX_OK; 910 } 911 912 if (ctcm_test_and_set_busy(dev)) 913 return NETDEV_TX_BUSY; 914 915 dev->trans_start = jiffies; 916 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 917 return NETDEV_TX_BUSY; 918 return NETDEV_TX_OK; 919} 920 921/* unmerged MPC variant of ctcm_tx */ 922static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 923{ 924 int len = 0; 925 struct ctcm_priv *priv = dev->ml_priv; 926 struct mpc_group *grp = priv->mpcg; 927 struct sk_buff *newskb = NULL; 928 929 /* 930 * Some sanity checks ... 931 */ 932 if (skb == NULL) { 933 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 934 "%s(%s): NULL sk_buff passed", 935 CTCM_FUNTAIL, dev->name); 936 priv->stats.tx_dropped++; 937 goto done; 938 } 939 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 940 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 941 "%s(%s): Got sk_buff with head room < %ld bytes", 942 CTCM_FUNTAIL, dev->name, 943 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 944 945 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 946 947 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 948 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 949 950 if (!newskb) { 951 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 952 "%s: %s: __dev_alloc_skb failed", 953 __func__, dev->name); 954 955 dev_kfree_skb_any(skb); 956 priv->stats.tx_dropped++; 957 priv->stats.tx_errors++; 958 priv->stats.tx_carrier_errors++; 959 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 960 goto done; 961 } 962 newskb->protocol = skb->protocol; 963 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 964 memcpy(skb_put(newskb, skb->len), skb->data, skb->len); 965 dev_kfree_skb_any(skb); 966 skb = newskb; 967 } 968 969 /* 970 * If channels are not running, 971 * notify anybody about a link failure and throw 972 * away packet. 973 */ 974 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 975 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 976 dev_kfree_skb_any(skb); 977 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 978 "%s(%s): inactive MPCGROUP - dropped", 979 CTCM_FUNTAIL, dev->name); 980 priv->stats.tx_dropped++; 981 priv->stats.tx_errors++; 982 priv->stats.tx_carrier_errors++; 983 goto done; 984 } 985 986 if (ctcm_test_and_set_busy(dev)) { 987 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 988 "%s(%s): device busy - dropped", 989 CTCM_FUNTAIL, dev->name); 990 dev_kfree_skb_any(skb); 991 priv->stats.tx_dropped++; 992 priv->stats.tx_errors++; 993 priv->stats.tx_carrier_errors++; 994 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 995 goto done; 996 } 997 998 dev->trans_start = jiffies; 999 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 1000 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1001 "%s(%s): device error - dropped", 1002 CTCM_FUNTAIL, dev->name); 1003 dev_kfree_skb_any(skb); 1004 priv->stats.tx_dropped++; 1005 priv->stats.tx_errors++; 1006 priv->stats.tx_carrier_errors++; 1007 ctcm_clear_busy(dev); 1008 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1009 goto done; 1010 } 1011 ctcm_clear_busy(dev); 1012done: 1013 if (do_debug) 1014 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1015 1016 return NETDEV_TX_OK; /* handle freeing of skb here */ 1017} 1018 1019 1020/** 1021 * Sets MTU of an interface. 1022 * 1023 * dev Pointer to interface struct. 1024 * new_mtu The new MTU to use for this interface. 1025 * 1026 * returns 0 on success, -EINVAL if MTU is out of valid range. 1027 * (valid range is 576 .. 65527). If VM is on the 1028 * remote side, maximum MTU is 32760, however this is 1029 * not checked here. 1030 */ 1031static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1032{ 1033 struct ctcm_priv *priv; 1034 int max_bufsize; 1035 1036 if (new_mtu < 576 || new_mtu > 65527) 1037 return -EINVAL; 1038 1039 priv = dev->ml_priv; 1040 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1041 1042 if (IS_MPC(priv)) { 1043 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1044 return -EINVAL; 1045 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1046 } else { 1047 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1048 return -EINVAL; 1049 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1050 } 1051 dev->mtu = new_mtu; 1052 return 0; 1053} 1054 1055/** 1056 * Returns interface statistics of a device. 1057 * 1058 * dev Pointer to interface struct. 1059 * 1060 * returns Pointer to stats struct of this interface. 1061 */ 1062static struct net_device_stats *ctcm_stats(struct net_device *dev) 1063{ 1064 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1065} 1066 1067static void ctcm_free_netdevice(struct net_device *dev) 1068{ 1069 struct ctcm_priv *priv; 1070 struct mpc_group *grp; 1071 1072 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1073 "%s(%s)", CTCM_FUNTAIL, dev->name); 1074 priv = dev->ml_priv; 1075 if (priv) { 1076 grp = priv->mpcg; 1077 if (grp) { 1078 if (grp->fsm) 1079 kfree_fsm(grp->fsm); 1080 if (grp->xid_skb) 1081 dev_kfree_skb(grp->xid_skb); 1082 if (grp->rcvd_xid_skb) 1083 dev_kfree_skb(grp->rcvd_xid_skb); 1084 tasklet_kill(&grp->mpc_tasklet2); 1085 kfree(grp); 1086 priv->mpcg = NULL; 1087 } 1088 if (priv->fsm) { 1089 kfree_fsm(priv->fsm); 1090 priv->fsm = NULL; 1091 } 1092 kfree(priv->xid); 1093 priv->xid = NULL; 1094 /* 1095 * Note: kfree(priv); is done in "opposite" function of 1096 * allocator function probe_device which is remove_device. 1097 */ 1098 } 1099#ifdef MODULE 1100 free_netdev(dev); 1101#endif 1102} 1103 1104struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1105 1106static const struct net_device_ops ctcm_netdev_ops = { 1107 .ndo_open = ctcm_open, 1108 .ndo_stop = ctcm_close, 1109 .ndo_get_stats = ctcm_stats, 1110 .ndo_change_mtu = ctcm_change_mtu, 1111 .ndo_start_xmit = ctcm_tx, 1112}; 1113 1114static const struct net_device_ops ctcm_mpc_netdev_ops = { 1115 .ndo_open = ctcm_open, 1116 .ndo_stop = ctcm_close, 1117 .ndo_get_stats = ctcm_stats, 1118 .ndo_change_mtu = ctcm_change_mtu, 1119 .ndo_start_xmit = ctcmpc_tx, 1120}; 1121 1122void static ctcm_dev_setup(struct net_device *dev) 1123{ 1124 dev->type = ARPHRD_SLIP; 1125 dev->tx_queue_len = 100; 1126 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1127} 1128 1129/* 1130 * Initialize everything of the net device except the name and the 1131 * channel structs. 1132 */ 1133static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1134{ 1135 struct net_device *dev; 1136 struct mpc_group *grp; 1137 if (!priv) 1138 return NULL; 1139 1140 if (IS_MPC(priv)) 1141 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); 1142 else 1143 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); 1144 1145 if (!dev) { 1146 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1147 "%s: MEMORY allocation ERROR", 1148 CTCM_FUNTAIL); 1149 return NULL; 1150 } 1151 dev->ml_priv = priv; 1152 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1153 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1154 dev_fsm, dev_fsm_len, GFP_KERNEL); 1155 if (priv->fsm == NULL) { 1156 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1157 free_netdev(dev); 1158 return NULL; 1159 } 1160 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1161 fsm_settimer(priv->fsm, &priv->restart_timer); 1162 1163 if (IS_MPC(priv)) { 1164 /* MPC Group Initializations */ 1165 grp = ctcmpc_init_mpc_group(priv); 1166 if (grp == NULL) { 1167 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1168 free_netdev(dev); 1169 return NULL; 1170 } 1171 tasklet_init(&grp->mpc_tasklet2, 1172 mpc_group_ready, (unsigned long)dev); 1173 dev->mtu = MPC_BUFSIZE_DEFAULT - 1174 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1175 1176 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1177 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1178 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1179 } else { 1180 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1181 dev->netdev_ops = &ctcm_netdev_ops; 1182 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1183 } 1184 1185 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1186 1187 return dev; 1188} 1189 1190/** 1191 * Main IRQ handler. 1192 * 1193 * cdev The ccw_device the interrupt is for. 1194 * intparm interruption parameter. 1195 * irb interruption response block. 1196 */ 1197static void ctcm_irq_handler(struct ccw_device *cdev, 1198 unsigned long intparm, struct irb *irb) 1199{ 1200 struct channel *ch; 1201 struct net_device *dev; 1202 struct ctcm_priv *priv; 1203 struct ccwgroup_device *cgdev; 1204 int cstat; 1205 int dstat; 1206 1207 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1208 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); 1209 1210 if (ctcm_check_irb_error(cdev, irb)) 1211 return; 1212 1213 cgdev = dev_get_drvdata(&cdev->dev); 1214 1215 cstat = irb->scsw.cmd.cstat; 1216 dstat = irb->scsw.cmd.dstat; 1217 1218 /* Check for unsolicited interrupts. */ 1219 if (cgdev == NULL) { 1220 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, 1221 "%s(%s) unsolicited irq: c-%02x d-%02x\n", 1222 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); 1223 dev_warn(&cdev->dev, 1224 "The adapter received a non-specific IRQ\n"); 1225 return; 1226 } 1227 1228 priv = dev_get_drvdata(&cgdev->dev); 1229 1230 /* Try to extract channel from driver data. */ 1231 if (priv->channel[CTCM_READ]->cdev == cdev) 1232 ch = priv->channel[CTCM_READ]; 1233 else if (priv->channel[CTCM_WRITE]->cdev == cdev) 1234 ch = priv->channel[CTCM_WRITE]; 1235 else { 1236 dev_err(&cdev->dev, 1237 "%s: Internal error: Can't determine channel for " 1238 "interrupt device %s\n", 1239 __func__, dev_name(&cdev->dev)); 1240 /* Explain: inconsistent internal structures */ 1241 return; 1242 } 1243 1244 dev = ch->netdev; 1245 if (dev == NULL) { 1246 dev_err(&cdev->dev, 1247 "%s Internal error: net_device is NULL, ch = 0x%p\n", 1248 __func__, ch); 1249 /* Explain: inconsistent internal structures */ 1250 return; 1251 } 1252 1253 /* Copy interruption response block. */ 1254 memcpy(ch->irb, irb, sizeof(struct irb)); 1255 1256 /* Issue error message and return on subchannel error code */ 1257 if (irb->scsw.cmd.cstat) { 1258 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); 1259 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1260 "%s(%s): sub-ch check %s: cs=%02x ds=%02x", 1261 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); 1262 dev_warn(&cdev->dev, 1263 "A check occurred on the subchannel\n"); 1264 return; 1265 } 1266 1267 /* Check the reason-code of a unit check */ 1268 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 1269 if ((irb->ecw[0] & ch->sense_rc) == 0) 1270 /* print it only once */ 1271 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1272 "%s(%s): sense=%02x, ds=%02x", 1273 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); 1274 ccw_unit_check(ch, irb->ecw[0]); 1275 return; 1276 } 1277 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { 1278 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) 1279 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); 1280 else 1281 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); 1282 return; 1283 } 1284 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 1285 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); 1286 return; 1287 } 1288 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || 1289 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || 1290 (irb->scsw.cmd.stctl == 1291 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) 1292 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); 1293 else 1294 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); 1295 1296} 1297 1298/** 1299 * Add ctcm specific attributes. 1300 * Add ctcm private data. 1301 * 1302 * cgdev pointer to ccwgroup_device just added 1303 * 1304 * returns 0 on success, !0 on failure. 1305 */ 1306static int ctcm_probe_device(struct ccwgroup_device *cgdev) 1307{ 1308 struct ctcm_priv *priv; 1309 int rc; 1310 1311 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1312 "%s %p", 1313 __func__, cgdev); 1314 1315 if (!get_device(&cgdev->dev)) 1316 return -ENODEV; 1317 1318 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); 1319 if (!priv) { 1320 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1321 "%s: memory allocation failure", 1322 CTCM_FUNTAIL); 1323 put_device(&cgdev->dev); 1324 return -ENOMEM; 1325 } 1326 1327 rc = ctcm_add_files(&cgdev->dev); 1328 if (rc) { 1329 kfree(priv); 1330 put_device(&cgdev->dev); 1331 return rc; 1332 } 1333 priv->buffer_size = CTCM_BUFSIZE_DEFAULT; 1334 cgdev->cdev[0]->handler = ctcm_irq_handler; 1335 cgdev->cdev[1]->handler = ctcm_irq_handler; 1336 dev_set_drvdata(&cgdev->dev, priv); 1337 1338 return 0; 1339} 1340 1341/** 1342 * Add a new channel to the list of channels. 1343 * Keeps the channel list sorted. 1344 * 1345 * cdev The ccw_device to be added. 1346 * type The type class of the new channel. 1347 * priv Points to the private data of the ccwgroup_device. 1348 * 1349 * returns 0 on success, !0 on error. 1350 */ 1351static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, 1352 struct ctcm_priv *priv) 1353{ 1354 struct channel **c = &channels; 1355 struct channel *ch; 1356 int ccw_num; 1357 int rc = 0; 1358 1359 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1360 "%s(%s), type %d, proto %d", 1361 __func__, dev_name(&cdev->dev), type, priv->protocol); 1362 1363 ch = kzalloc(sizeof(struct channel), GFP_KERNEL); 1364 if (ch == NULL) 1365 return -ENOMEM; 1366 1367 ch->protocol = priv->protocol; 1368 if (IS_MPC(priv)) { 1369 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1370 if (ch->discontact_th == NULL) 1371 goto nomem_return; 1372 1373 ch->discontact_th->th_blk_flag = TH_DISCONTACT; 1374 tasklet_init(&ch->ch_disc_tasklet, 1375 mpc_action_send_discontact, (unsigned long)ch); 1376 1377 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); 1378 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); 1379 ccw_num = 17; 1380 } else 1381 ccw_num = 8; 1382 1383 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); 1384 if (ch->ccw == NULL) 1385 goto nomem_return; 1386 1387 ch->cdev = cdev; 1388 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); 1389 ch->type = type; 1390 1391 /** 1392 * "static" ccws are used in the following way: 1393 * 1394 * ccw[0..2] (Channel program for generic I/O): 1395 * 0: prepare 1396 * 1: read or write (depending on direction) with fixed 1397 * buffer (idal allocated once when buffer is allocated) 1398 * 2: nop 1399 * ccw[3..5] (Channel program for direct write of packets) 1400 * 3: prepare 1401 * 4: write (idal allocated on every write). 1402 * 5: nop 1403 * ccw[6..7] (Channel program for initial channel setup): 1404 * 6: set extended mode 1405 * 7: nop 1406 * 1407 * ch->ccw[0..5] are initialized in ch_action_start because 1408 * the channel's direction is yet unknown here. 1409 * 1410 * ccws used for xid2 negotiations 1411 * ch-ccw[8-14] need to be used for the XID exchange either 1412 * X side XID2 Processing 1413 * 8: write control 1414 * 9: write th 1415 * 10: write XID 1416 * 11: read th from secondary 1417 * 12: read XID from secondary 1418 * 13: read 4 byte ID 1419 * 14: nop 1420 * Y side XID Processing 1421 * 8: sense 1422 * 9: read th 1423 * 10: read XID 1424 * 11: write th 1425 * 12: write XID 1426 * 13: write 4 byte ID 1427 * 14: nop 1428 * 1429 * ccws used for double noop due to VM timing issues 1430 * which result in unrecoverable Busy on channel 1431 * 15: nop 1432 * 16: nop 1433 */ 1434 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; 1435 ch->ccw[6].flags = CCW_FLAG_SLI; 1436 1437 ch->ccw[7].cmd_code = CCW_CMD_NOOP; 1438 ch->ccw[7].flags = CCW_FLAG_SLI; 1439 1440 if (IS_MPC(priv)) { 1441 ch->ccw[15].cmd_code = CCW_CMD_WRITE; 1442 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1443 ch->ccw[15].count = TH_HEADER_LENGTH; 1444 ch->ccw[15].cda = virt_to_phys(ch->discontact_th); 1445 1446 ch->ccw[16].cmd_code = CCW_CMD_NOOP; 1447 ch->ccw[16].flags = CCW_FLAG_SLI; 1448 1449 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1450 ctc_ch_event_names, CTC_MPC_NR_STATES, 1451 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, 1452 mpc_ch_fsm_len, GFP_KERNEL); 1453 } else { 1454 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1455 ctc_ch_event_names, CTC_NR_STATES, 1456 CTC_NR_EVENTS, ch_fsm, 1457 ch_fsm_len, GFP_KERNEL); 1458 } 1459 if (ch->fsm == NULL) 1460 goto free_return; 1461 1462 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 1463 1464 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); 1465 if (ch->irb == NULL) 1466 goto nomem_return; 1467 1468 while (*c && ctcm_less_than((*c)->id, ch->id)) 1469 c = &(*c)->next; 1470 1471 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { 1472 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1473 "%s (%s) already in list, using old entry", 1474 __func__, (*c)->id); 1475 1476 goto free_return; 1477 } 1478 1479 spin_lock_init(&ch->collect_lock); 1480 1481 fsm_settimer(ch->fsm, &ch->timer); 1482 skb_queue_head_init(&ch->io_queue); 1483 skb_queue_head_init(&ch->collect_queue); 1484 1485 if (IS_MPC(priv)) { 1486 fsm_settimer(ch->fsm, &ch->sweep_timer); 1487 skb_queue_head_init(&ch->sweep_queue); 1488 } 1489 ch->next = *c; 1490 *c = ch; 1491 return 0; 1492 1493nomem_return: 1494 rc = -ENOMEM; 1495 1496free_return: /* note that all channel pointers are 0 or valid */ 1497 kfree(ch->ccw); 1498 kfree(ch->discontact_th); 1499 kfree_fsm(ch->fsm); 1500 kfree(ch->irb); 1501 kfree(ch); 1502 return rc; 1503} 1504 1505/* 1506 * Return type of a detected device. 1507 */ 1508static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) 1509{ 1510 enum ctcm_channel_types type; 1511 type = (enum ctcm_channel_types)id->driver_info; 1512 1513 if (type == ctcm_channel_type_ficon) 1514 type = ctcm_channel_type_escon; 1515 1516 return type; 1517} 1518 1519/** 1520 * 1521 * Setup an interface. 1522 * 1523 * cgdev Device to be setup. 1524 * 1525 * returns 0 on success, !0 on failure. 1526 */ 1527static int ctcm_new_device(struct ccwgroup_device *cgdev) 1528{ 1529 char read_id[CTCM_ID_SIZE]; 1530 char write_id[CTCM_ID_SIZE]; 1531 int direction; 1532 enum ctcm_channel_types type; 1533 struct ctcm_priv *priv; 1534 struct net_device *dev; 1535 struct ccw_device *cdev0; 1536 struct ccw_device *cdev1; 1537 struct channel *readc; 1538 struct channel *writec; 1539 int ret; 1540 int result; 1541 1542 priv = dev_get_drvdata(&cgdev->dev); 1543 if (!priv) { 1544 result = -ENODEV; 1545 goto out_err_result; 1546 } 1547 1548 cdev0 = cgdev->cdev[0]; 1549 cdev1 = cgdev->cdev[1]; 1550 1551 type = get_channel_type(&cdev0->id); 1552 1553 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); 1554 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); 1555 1556 ret = add_channel(cdev0, type, priv); 1557 if (ret) { 1558 result = ret; 1559 goto out_err_result; 1560 } 1561 ret = add_channel(cdev1, type, priv); 1562 if (ret) { 1563 result = ret; 1564 goto out_remove_channel1; 1565 } 1566 1567 ret = ccw_device_set_online(cdev0); 1568 if (ret != 0) { 1569 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1570 "%s(%s) set_online rc=%d", 1571 CTCM_FUNTAIL, read_id, ret); 1572 result = -EIO; 1573 goto out_remove_channel2; 1574 } 1575 1576 ret = ccw_device_set_online(cdev1); 1577 if (ret != 0) { 1578 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1579 "%s(%s) set_online rc=%d", 1580 CTCM_FUNTAIL, write_id, ret); 1581 1582 result = -EIO; 1583 goto out_ccw1; 1584 } 1585 1586 dev = ctcm_init_netdevice(priv); 1587 if (dev == NULL) { 1588 result = -ENODEV; 1589 goto out_ccw2; 1590 } 1591 1592 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1593 priv->channel[direction] = 1594 channel_get(type, direction == CTCM_READ ? 1595 read_id : write_id, direction); 1596 if (priv->channel[direction] == NULL) { 1597 if (direction == CTCM_WRITE) 1598 channel_free(priv->channel[CTCM_READ]); 1599 goto out_dev; 1600 } 1601 priv->channel[direction]->netdev = dev; 1602 priv->channel[direction]->protocol = priv->protocol; 1603 priv->channel[direction]->max_bufsize = priv->buffer_size; 1604 } 1605 /* sysfs magic */ 1606 SET_NETDEV_DEV(dev, &cgdev->dev); 1607 1608 if (register_netdev(dev)) { 1609 result = -ENODEV; 1610 goto out_dev; 1611 } 1612 1613 if (ctcm_add_attributes(&cgdev->dev)) { 1614 result = -ENODEV; 1615 goto out_unregister; 1616 } 1617 1618 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1619 1620 dev_info(&dev->dev, 1621 "setup OK : r/w = %s/%s, protocol : %d\n", 1622 priv->channel[CTCM_READ]->id, 1623 priv->channel[CTCM_WRITE]->id, priv->protocol); 1624 1625 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1626 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1627 priv->channel[CTCM_READ]->id, 1628 priv->channel[CTCM_WRITE]->id, priv->protocol); 1629 1630 return 0; 1631out_unregister: 1632 unregister_netdev(dev); 1633out_dev: 1634 ctcm_free_netdevice(dev); 1635out_ccw2: 1636 ccw_device_set_offline(cgdev->cdev[1]); 1637out_ccw1: 1638 ccw_device_set_offline(cgdev->cdev[0]); 1639out_remove_channel2: 1640 readc = channel_get(type, read_id, CTCM_READ); 1641 channel_remove(readc); 1642out_remove_channel1: 1643 writec = channel_get(type, write_id, CTCM_WRITE); 1644 channel_remove(writec); 1645out_err_result: 1646 return result; 1647} 1648 1649/** 1650 * Shutdown an interface. 1651 * 1652 * cgdev Device to be shut down. 1653 * 1654 * returns 0 on success, !0 on failure. 1655 */ 1656static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1657{ 1658 struct ctcm_priv *priv; 1659 struct net_device *dev; 1660 1661 priv = dev_get_drvdata(&cgdev->dev); 1662 if (!priv) 1663 return -ENODEV; 1664 1665 if (priv->channel[CTCM_READ]) { 1666 dev = priv->channel[CTCM_READ]->netdev; 1667 CTCM_DBF_DEV(SETUP, dev, ""); 1668 /* Close the device */ 1669 ctcm_close(dev); 1670 dev->flags &= ~IFF_RUNNING; 1671 ctcm_remove_attributes(&cgdev->dev); 1672 channel_free(priv->channel[CTCM_READ]); 1673 } else 1674 dev = NULL; 1675 1676 if (priv->channel[CTCM_WRITE]) 1677 channel_free(priv->channel[CTCM_WRITE]); 1678 1679 if (dev) { 1680 unregister_netdev(dev); 1681 ctcm_free_netdevice(dev); 1682 } 1683 1684 if (priv->fsm) 1685 kfree_fsm(priv->fsm); 1686 1687 ccw_device_set_offline(cgdev->cdev[1]); 1688 ccw_device_set_offline(cgdev->cdev[0]); 1689 1690 if (priv->channel[CTCM_READ]) 1691 channel_remove(priv->channel[CTCM_READ]); 1692 if (priv->channel[CTCM_WRITE]) 1693 channel_remove(priv->channel[CTCM_WRITE]); 1694 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1695 1696 return 0; 1697 1698} 1699 1700 1701static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1702{ 1703 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1704 1705 BUG_ON(priv == NULL); 1706 1707 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1708 "removing device %p, proto : %d", 1709 cgdev, priv->protocol); 1710 1711 if (cgdev->state == CCWGROUP_ONLINE) 1712 ctcm_shutdown_device(cgdev); 1713 ctcm_remove_files(&cgdev->dev); 1714 dev_set_drvdata(&cgdev->dev, NULL); 1715 kfree(priv); 1716 put_device(&cgdev->dev); 1717} 1718 1719static int ctcm_pm_suspend(struct ccwgroup_device *gdev) 1720{ 1721 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1722 1723 if (gdev->state == CCWGROUP_OFFLINE) 1724 return 0; 1725 netif_device_detach(priv->channel[CTCM_READ]->netdev); 1726 ctcm_close(priv->channel[CTCM_READ]->netdev); 1727 if (!wait_event_timeout(priv->fsm->wait_q, 1728 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { 1729 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1730 return -EBUSY; 1731 } 1732 ccw_device_set_offline(gdev->cdev[1]); 1733 ccw_device_set_offline(gdev->cdev[0]); 1734 return 0; 1735} 1736 1737static int ctcm_pm_resume(struct ccwgroup_device *gdev) 1738{ 1739 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1740 int rc; 1741 1742 if (gdev->state == CCWGROUP_OFFLINE) 1743 return 0; 1744 rc = ccw_device_set_online(gdev->cdev[1]); 1745 if (rc) 1746 goto err_out; 1747 rc = ccw_device_set_online(gdev->cdev[0]); 1748 if (rc) 1749 goto err_out; 1750 ctcm_open(priv->channel[CTCM_READ]->netdev); 1751err_out: 1752 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1753 return rc; 1754} 1755 1756static struct ccw_device_id ctcm_ids[] = { 1757 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1758 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1759 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1760 {}, 1761}; 1762MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1763 1764static struct ccw_driver ctcm_ccw_driver = { 1765 .owner = THIS_MODULE, 1766 .name = "ctcm", 1767 .ids = ctcm_ids, 1768 .probe = ccwgroup_probe_ccwdev, 1769 .remove = ccwgroup_remove_ccwdev, 1770}; 1771 1772static struct ccwgroup_driver ctcm_group_driver = { 1773 .owner = THIS_MODULE, 1774 .name = CTC_DRIVER_NAME, 1775 .max_slaves = 2, 1776 .driver_id = 0xC3E3C3D4, /* CTCM */ 1777 .probe = ctcm_probe_device, 1778 .remove = ctcm_remove_device, 1779 .set_online = ctcm_new_device, 1780 .set_offline = ctcm_shutdown_device, 1781 .freeze = ctcm_pm_suspend, 1782 .thaw = ctcm_pm_resume, 1783 .restore = ctcm_pm_resume, 1784}; 1785 1786static ssize_t 1787ctcm_driver_group_store(struct device_driver *ddrv, const char *buf, 1788 size_t count) 1789{ 1790 int err; 1791 1792 err = ccwgroup_create_from_string(ctcm_root_dev, 1793 ctcm_group_driver.driver_id, 1794 &ctcm_ccw_driver, 2, buf); 1795 return err ? err : count; 1796} 1797 1798static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store); 1799 1800static struct attribute *ctcm_group_attrs[] = { 1801 &driver_attr_group.attr, 1802 NULL, 1803}; 1804 1805static struct attribute_group ctcm_group_attr_group = { 1806 .attrs = ctcm_group_attrs, 1807}; 1808 1809static const struct attribute_group *ctcm_group_attr_groups[] = { 1810 &ctcm_group_attr_group, 1811 NULL, 1812}; 1813 1814/* 1815 * Module related routines 1816 */ 1817 1818/* 1819 * Prepare to be unloaded. Free IRQ's and release all resources. 1820 * This is called just before this module is unloaded. It is 1821 * not called, if the usage count is !0, so we don't need to check 1822 * for that. 1823 */ 1824static void __exit ctcm_exit(void) 1825{ 1826 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group); 1827 ccwgroup_driver_unregister(&ctcm_group_driver); 1828 ccw_driver_unregister(&ctcm_ccw_driver); 1829 root_device_unregister(ctcm_root_dev); 1830 ctcm_unregister_dbf_views(); 1831 pr_info("CTCM driver unloaded\n"); 1832} 1833 1834/* 1835 * Print Banner. 1836 */ 1837static void print_banner(void) 1838{ 1839 pr_info("CTCM driver initialized\n"); 1840} 1841 1842/** 1843 * Initialize module. 1844 * This is called just after the module is loaded. 1845 * 1846 * returns 0 on success, !0 on error. 1847 */ 1848static int __init ctcm_init(void) 1849{ 1850 int ret; 1851 1852 channels = NULL; 1853 1854 ret = ctcm_register_dbf_views(); 1855 if (ret) 1856 goto out_err; 1857 ctcm_root_dev = root_device_register("ctcm"); 1858 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0; 1859 if (ret) 1860 goto register_err; 1861 ret = ccw_driver_register(&ctcm_ccw_driver); 1862 if (ret) 1863 goto ccw_err; 1864 ctcm_group_driver.driver.groups = ctcm_group_attr_groups; 1865 ret = ccwgroup_driver_register(&ctcm_group_driver); 1866 if (ret) 1867 goto ccwgroup_err; 1868 print_banner(); 1869 return 0; 1870 1871ccwgroup_err: 1872 ccw_driver_unregister(&ctcm_ccw_driver); 1873ccw_err: 1874 root_device_unregister(ctcm_root_dev); 1875register_err: 1876 ctcm_unregister_dbf_views(); 1877out_err: 1878 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1879 __func__, ret); 1880 return ret; 1881} 1882 1883module_init(ctcm_init); 1884module_exit(ctcm_exit); 1885 1886MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1887MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1888MODULE_LICENSE("GPL"); 1889