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/kernel_stat.h> 28 #include <linux/module.h> 29 #include <linux/init.h> 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/errno.h> 33 #include <linux/types.h> 34 #include <linux/interrupt.h> 35 #include <linux/timer.h> 36 #include <linux/bitops.h> 37 38 #include <linux/signal.h> 39 #include <linux/string.h> 40 41 #include <linux/ip.h> 42 #include <linux/if_arp.h> 43 #include <linux/tcp.h> 44 #include <linux/skbuff.h> 45 #include <linux/ctype.h> 46 #include <net/dst.h> 47 48 #include <linux/io.h> 49 #include <asm/ccwdev.h> 50 #include <asm/ccwgroup.h> 51 #include <linux/uaccess.h> 52 53 #include <asm/idals.h> 54 55 #include "ctcm_fsms.h" 56 #include "ctcm_main.h" 57 58 /* Some common global variables */ 59 60 /** 61 * The root device for ctcm group devices 62 */ 63 static struct device *ctcm_root_dev; 64 65 /* 66 * Linked list of all detected channels. 67 */ 68 struct channel *channels; 69 70 /** 71 * Unpack a just received skb and hand it over to 72 * upper layers. 73 * 74 * ch The channel where this skb has been received. 75 * pskb The received skb. 76 */ 77 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) 78 { 79 struct net_device *dev = ch->netdev; 80 struct ctcm_priv *priv = dev->ml_priv; 81 __u16 len = *((__u16 *) pskb->data); 82 83 skb_put(pskb, 2 + LL_HEADER_LENGTH); 84 skb_pull(pskb, 2); 85 pskb->dev = dev; 86 pskb->ip_summed = CHECKSUM_UNNECESSARY; 87 while (len > 0) { 88 struct sk_buff *skb; 89 int skblen; 90 struct ll_header *header = (struct ll_header *)pskb->data; 91 92 skb_pull(pskb, LL_HEADER_LENGTH); 93 if ((ch->protocol == CTCM_PROTO_S390) && 94 (header->type != ETH_P_IP)) { 95 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { 96 ch->logflags |= LOG_FLAG_ILLEGALPKT; 97 /* 98 * Check packet type only if we stick strictly 99 * to S/390's protocol of OS390. This only 100 * supports IP. Otherwise allow any packet 101 * type. 102 */ 103 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 104 "%s(%s): Illegal packet type 0x%04x" 105 " - dropping", 106 CTCM_FUNTAIL, dev->name, header->type); 107 } 108 priv->stats.rx_dropped++; 109 priv->stats.rx_frame_errors++; 110 return; 111 } 112 pskb->protocol = ntohs(header->type); 113 if ((header->length <= LL_HEADER_LENGTH) || 114 (len <= LL_HEADER_LENGTH)) { 115 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { 116 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 117 "%s(%s): Illegal packet size %d(%d,%d)" 118 "- dropping", 119 CTCM_FUNTAIL, dev->name, 120 header->length, dev->mtu, len); 121 ch->logflags |= LOG_FLAG_ILLEGALSIZE; 122 } 123 124 priv->stats.rx_dropped++; 125 priv->stats.rx_length_errors++; 126 return; 127 } 128 header->length -= LL_HEADER_LENGTH; 129 len -= LL_HEADER_LENGTH; 130 if ((header->length > skb_tailroom(pskb)) || 131 (header->length > len)) { 132 if (!(ch->logflags & LOG_FLAG_OVERRUN)) { 133 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 134 "%s(%s): Packet size %d (overrun)" 135 " - dropping", CTCM_FUNTAIL, 136 dev->name, header->length); 137 ch->logflags |= LOG_FLAG_OVERRUN; 138 } 139 140 priv->stats.rx_dropped++; 141 priv->stats.rx_length_errors++; 142 return; 143 } 144 skb_put(pskb, header->length); 145 skb_reset_mac_header(pskb); 146 len -= header->length; 147 skb = dev_alloc_skb(pskb->len); 148 if (!skb) { 149 if (!(ch->logflags & LOG_FLAG_NOMEM)) { 150 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 151 "%s(%s): MEMORY allocation error", 152 CTCM_FUNTAIL, dev->name); 153 ch->logflags |= LOG_FLAG_NOMEM; 154 } 155 priv->stats.rx_dropped++; 156 return; 157 } 158 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), 159 pskb->len); 160 skb_reset_mac_header(skb); 161 skb->dev = pskb->dev; 162 skb->protocol = pskb->protocol; 163 pskb->ip_summed = CHECKSUM_UNNECESSARY; 164 skblen = skb->len; 165 /* 166 * reset logflags 167 */ 168 ch->logflags = 0; 169 priv->stats.rx_packets++; 170 priv->stats.rx_bytes += skblen; 171 netif_rx_ni(skb); 172 if (len > 0) { 173 skb_pull(pskb, header->length); 174 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { 175 CTCM_DBF_DEV_NAME(TRACE, dev, 176 "Overrun in ctcm_unpack_skb"); 177 ch->logflags |= LOG_FLAG_OVERRUN; 178 return; 179 } 180 skb_put(pskb, LL_HEADER_LENGTH); 181 } 182 } 183 } 184 185 /** 186 * Release a specific channel in the channel list. 187 * 188 * ch Pointer to channel struct to be released. 189 */ 190 static void channel_free(struct channel *ch) 191 { 192 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); 193 ch->flags &= ~CHANNEL_FLAGS_INUSE; 194 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 195 } 196 197 /** 198 * Remove a specific channel in the channel list. 199 * 200 * ch Pointer to channel struct to be released. 201 */ 202 static void channel_remove(struct channel *ch) 203 { 204 struct channel **c = &channels; 205 char chid[CTCM_ID_SIZE+1]; 206 int ok = 0; 207 208 if (ch == NULL) 209 return; 210 else 211 strncpy(chid, ch->id, CTCM_ID_SIZE); 212 213 channel_free(ch); 214 while (*c) { 215 if (*c == ch) { 216 *c = ch->next; 217 fsm_deltimer(&ch->timer); 218 if (IS_MPC(ch)) 219 fsm_deltimer(&ch->sweep_timer); 220 221 kfree_fsm(ch->fsm); 222 clear_normalized_cda(&ch->ccw[4]); 223 if (ch->trans_skb != NULL) { 224 clear_normalized_cda(&ch->ccw[1]); 225 dev_kfree_skb_any(ch->trans_skb); 226 } 227 if (IS_MPC(ch)) { 228 tasklet_kill(&ch->ch_tasklet); 229 tasklet_kill(&ch->ch_disc_tasklet); 230 kfree(ch->discontact_th); 231 } 232 kfree(ch->ccw); 233 kfree(ch->irb); 234 kfree(ch); 235 ok = 1; 236 break; 237 } 238 c = &((*c)->next); 239 } 240 241 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, 242 chid, ok ? "OK" : "failed"); 243 } 244 245 /** 246 * Get a specific channel from the channel list. 247 * 248 * type Type of channel we are interested in. 249 * id Id of channel we are interested in. 250 * direction Direction we want to use this channel for. 251 * 252 * returns Pointer to a channel or NULL if no matching channel available. 253 */ 254 static struct channel *channel_get(enum ctcm_channel_types type, 255 char *id, int direction) 256 { 257 struct channel *ch = channels; 258 259 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) 260 ch = ch->next; 261 if (!ch) { 262 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 263 "%s(%d, %s, %d) not found in channel list\n", 264 CTCM_FUNTAIL, type, id, direction); 265 } else { 266 if (ch->flags & CHANNEL_FLAGS_INUSE) 267 ch = NULL; 268 else { 269 ch->flags |= CHANNEL_FLAGS_INUSE; 270 ch->flags &= ~CHANNEL_FLAGS_RWMASK; 271 ch->flags |= (direction == CTCM_WRITE) 272 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; 273 fsm_newstate(ch->fsm, CTC_STATE_STOPPED); 274 } 275 } 276 return ch; 277 } 278 279 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) 280 { 281 if (!IS_ERR(irb)) 282 return 0; 283 284 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, 285 "irb error %ld on device %s\n", 286 PTR_ERR(irb), dev_name(&cdev->dev)); 287 288 switch (PTR_ERR(irb)) { 289 case -EIO: 290 dev_err(&cdev->dev, 291 "An I/O-error occurred on the CTCM device\n"); 292 break; 293 case -ETIMEDOUT: 294 dev_err(&cdev->dev, 295 "An adapter hardware operation timed out\n"); 296 break; 297 default: 298 dev_err(&cdev->dev, 299 "An error occurred on the adapter hardware\n"); 300 } 301 return PTR_ERR(irb); 302 } 303 304 305 /** 306 * Check sense of a unit check. 307 * 308 * ch The channel, the sense code belongs to. 309 * sense The sense code to inspect. 310 */ 311 static inline void ccw_unit_check(struct channel *ch, __u8 sense) 312 { 313 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 314 "%s(%s): %02x", 315 CTCM_FUNTAIL, ch->id, sense); 316 317 if (sense & SNS0_INTERVENTION_REQ) { 318 if (sense & 0x01) { 319 if (ch->sense_rc != 0x01) { 320 pr_notice( 321 "%s: The communication peer has " 322 "disconnected\n", ch->id); 323 ch->sense_rc = 0x01; 324 } 325 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); 326 } else { 327 if (ch->sense_rc != SNS0_INTERVENTION_REQ) { 328 pr_notice( 329 "%s: The remote operating system is " 330 "not available\n", ch->id); 331 ch->sense_rc = SNS0_INTERVENTION_REQ; 332 } 333 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); 334 } 335 } else if (sense & SNS0_EQUIPMENT_CHECK) { 336 if (sense & SNS0_BUS_OUT_CHECK) { 337 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 338 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 339 "%s(%s): remote HW error %02x", 340 CTCM_FUNTAIL, ch->id, sense); 341 ch->sense_rc = SNS0_BUS_OUT_CHECK; 342 } 343 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); 344 } else { 345 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { 346 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 347 "%s(%s): remote read parity error %02x", 348 CTCM_FUNTAIL, ch->id, sense); 349 ch->sense_rc = SNS0_EQUIPMENT_CHECK; 350 } 351 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); 352 } 353 } else if (sense & SNS0_BUS_OUT_CHECK) { 354 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 355 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 356 "%s(%s): BUS OUT error %02x", 357 CTCM_FUNTAIL, ch->id, sense); 358 ch->sense_rc = SNS0_BUS_OUT_CHECK; 359 } 360 if (sense & 0x04) /* data-streaming timeout */ 361 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); 362 else /* Data-transfer parity error */ 363 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); 364 } else if (sense & SNS0_CMD_REJECT) { 365 if (ch->sense_rc != SNS0_CMD_REJECT) { 366 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 367 "%s(%s): Command rejected", 368 CTCM_FUNTAIL, ch->id); 369 ch->sense_rc = SNS0_CMD_REJECT; 370 } 371 } else if (sense == 0) { 372 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 373 "%s(%s): Unit check ZERO", 374 CTCM_FUNTAIL, ch->id); 375 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); 376 } else { 377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 378 "%s(%s): Unit check code %02x unknown", 379 CTCM_FUNTAIL, ch->id, sense); 380 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); 381 } 382 } 383 384 int ctcm_ch_alloc_buffer(struct channel *ch) 385 { 386 clear_normalized_cda(&ch->ccw[1]); 387 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); 388 if (ch->trans_skb == NULL) { 389 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 390 "%s(%s): %s trans_skb allocation error", 391 CTCM_FUNTAIL, ch->id, 392 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 393 "RX" : "TX"); 394 return -ENOMEM; 395 } 396 397 ch->ccw[1].count = ch->max_bufsize; 398 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 399 dev_kfree_skb(ch->trans_skb); 400 ch->trans_skb = NULL; 401 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 402 "%s(%s): %s set norm_cda failed", 403 CTCM_FUNTAIL, ch->id, 404 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 405 "RX" : "TX"); 406 return -ENOMEM; 407 } 408 409 ch->ccw[1].count = 0; 410 ch->trans_skb_data = ch->trans_skb->data; 411 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; 412 return 0; 413 } 414 415 /* 416 * Interface API for upper network layers 417 */ 418 419 /** 420 * Open an interface. 421 * Called from generic network layer when ifconfig up is run. 422 * 423 * dev Pointer to interface struct. 424 * 425 * returns 0 on success, -ERRNO on failure. (Never fails.) 426 */ 427 int ctcm_open(struct net_device *dev) 428 { 429 struct ctcm_priv *priv = dev->ml_priv; 430 431 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 432 if (!IS_MPC(priv)) 433 fsm_event(priv->fsm, DEV_EVENT_START, dev); 434 return 0; 435 } 436 437 /** 438 * Close an interface. 439 * Called from generic network layer when ifconfig down is run. 440 * 441 * dev Pointer to interface struct. 442 * 443 * returns 0 on success, -ERRNO on failure. (Never fails.) 444 */ 445 int ctcm_close(struct net_device *dev) 446 { 447 struct ctcm_priv *priv = dev->ml_priv; 448 449 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 450 if (!IS_MPC(priv)) 451 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 452 return 0; 453 } 454 455 456 /** 457 * Transmit a packet. 458 * This is a helper function for ctcm_tx(). 459 * 460 * ch Channel to be used for sending. 461 * skb Pointer to struct sk_buff of packet to send. 462 * The linklevel header has already been set up 463 * by ctcm_tx(). 464 * 465 * returns 0 on success, -ERRNO on failure. (Never fails.) 466 */ 467 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) 468 { 469 unsigned long saveflags; 470 struct ll_header header; 471 int rc = 0; 472 __u16 block_len; 473 int ccw_idx; 474 struct sk_buff *nskb; 475 unsigned long hi; 476 477 /* we need to acquire the lock for testing the state 478 * otherwise we can have an IRQ changing the state to 479 * TXIDLE after the test but before acquiring the lock. 480 */ 481 spin_lock_irqsave(&ch->collect_lock, saveflags); 482 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { 483 int l = skb->len + LL_HEADER_LENGTH; 484 485 if (ch->collect_len + l > ch->max_bufsize - 2) { 486 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 487 return -EBUSY; 488 } else { 489 atomic_inc(&skb->users); 490 header.length = l; 491 header.type = skb->protocol; 492 header.unused = 0; 493 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, 494 LL_HEADER_LENGTH); 495 skb_queue_tail(&ch->collect_queue, skb); 496 ch->collect_len += l; 497 } 498 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 499 goto done; 500 } 501 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 502 /* 503 * Protect skb against beeing free'd by upper 504 * layers. 505 */ 506 atomic_inc(&skb->users); 507 ch->prof.txlen += skb->len; 508 header.length = skb->len + LL_HEADER_LENGTH; 509 header.type = skb->protocol; 510 header.unused = 0; 511 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); 512 block_len = skb->len + 2; 513 *((__u16 *)skb_push(skb, 2)) = block_len; 514 515 /* 516 * IDAL support in CTCM is broken, so we have to 517 * care about skb's above 2G ourselves. 518 */ 519 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; 520 if (hi) { 521 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 522 if (!nskb) { 523 atomic_dec(&skb->users); 524 skb_pull(skb, LL_HEADER_LENGTH + 2); 525 ctcm_clear_busy(ch->netdev); 526 return -ENOMEM; 527 } else { 528 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 529 atomic_inc(&nskb->users); 530 atomic_dec(&skb->users); 531 dev_kfree_skb_irq(skb); 532 skb = nskb; 533 } 534 } 535 536 ch->ccw[4].count = block_len; 537 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 538 /* 539 * idal allocation failed, try via copying to 540 * trans_skb. trans_skb usually has a pre-allocated 541 * idal. 542 */ 543 if (ctcm_checkalloc_buffer(ch)) { 544 /* 545 * Remove our header. It gets added 546 * again on retransmit. 547 */ 548 atomic_dec(&skb->users); 549 skb_pull(skb, LL_HEADER_LENGTH + 2); 550 ctcm_clear_busy(ch->netdev); 551 return -ENOMEM; 552 } 553 554 skb_reset_tail_pointer(ch->trans_skb); 555 ch->trans_skb->len = 0; 556 ch->ccw[1].count = skb->len; 557 skb_copy_from_linear_data(skb, 558 skb_put(ch->trans_skb, skb->len), skb->len); 559 atomic_dec(&skb->users); 560 dev_kfree_skb_irq(skb); 561 ccw_idx = 0; 562 } else { 563 skb_queue_tail(&ch->io_queue, skb); 564 ccw_idx = 3; 565 } 566 ch->retry = 0; 567 fsm_newstate(ch->fsm, CTC_STATE_TX); 568 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 569 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 570 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 572 (unsigned long)ch, 0xff, 0); 573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 574 if (ccw_idx == 3) 575 ch->prof.doios_single++; 576 if (rc != 0) { 577 fsm_deltimer(&ch->timer); 578 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 579 if (ccw_idx == 3) 580 skb_dequeue_tail(&ch->io_queue); 581 /* 582 * Remove our header. It gets added 583 * again on retransmit. 584 */ 585 skb_pull(skb, LL_HEADER_LENGTH + 2); 586 } else if (ccw_idx == 0) { 587 struct net_device *dev = ch->netdev; 588 struct ctcm_priv *priv = dev->ml_priv; 589 priv->stats.tx_packets++; 590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 591 } 592 done: 593 ctcm_clear_busy(ch->netdev); 594 return rc; 595 } 596 597 static void ctcmpc_send_sweep_req(struct channel *rch) 598 { 599 struct net_device *dev = rch->netdev; 600 struct ctcm_priv *priv; 601 struct mpc_group *grp; 602 struct th_sweep *header; 603 struct sk_buff *sweep_skb; 604 struct channel *ch; 605 /* int rc = 0; */ 606 607 priv = dev->ml_priv; 608 grp = priv->mpcg; 609 ch = priv->channel[CTCM_WRITE]; 610 611 /* sweep processing is not complete until response and request */ 612 /* has completed for all read channels in group */ 613 if (grp->in_sweep == 0) { 614 grp->in_sweep = 1; 615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 617 } 618 619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 620 621 if (sweep_skb == NULL) { 622 /* rc = -ENOMEM; */ 623 goto nomem; 624 } 625 626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); 627 628 if (!header) { 629 dev_kfree_skb_any(sweep_skb); 630 /* rc = -ENOMEM; */ 631 goto nomem; 632 } 633 634 header->th.th_seg = 0x00 ; 635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ 636 header->th.th_blk_flag = 0x00; 637 header->th.th_is_xid = 0x00; 638 header->th.th_seq_num = 0x00; 639 header->sw.th_last_seq = ch->th_seq_num; 640 641 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 642 643 kfree(header); 644 645 dev->trans_start = jiffies; 646 skb_queue_tail(&ch->sweep_queue, sweep_skb); 647 648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 649 650 return; 651 652 nomem: 653 grp->in_sweep = 0; 654 ctcm_clear_busy(dev); 655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 656 657 return; 658 } 659 660 /* 661 * MPC mode version of transmit_skb 662 */ 663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) 664 { 665 struct pdu *p_header; 666 struct net_device *dev = ch->netdev; 667 struct ctcm_priv *priv = dev->ml_priv; 668 struct mpc_group *grp = priv->mpcg; 669 struct th_header *header; 670 struct sk_buff *nskb; 671 int rc = 0; 672 int ccw_idx; 673 unsigned long hi; 674 unsigned long saveflags = 0; /* avoids compiler warning */ 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 /* 722 * IDAL support in CTCM is broken, so we have to 723 * care about skb's above 2G ourselves. 724 */ 725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 726 if (hi) { 727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 728 if (!nskb) { 729 goto nomem_exit; 730 } else { 731 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 732 atomic_inc(&nskb->users); 733 atomic_dec(&skb->users); 734 dev_kfree_skb_irq(skb); 735 skb = nskb; 736 } 737 } 738 739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 740 741 if (!p_header) 742 goto nomem_exit; 743 744 p_header->pdu_offset = skb->len; 745 p_header->pdu_proto = 0x01; 746 p_header->pdu_flag = 0x00; 747 p_header->pdu_seq = 0; 748 if (skb->protocol == ntohs(ETH_P_SNAP)) { 749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 750 } else { 751 p_header->pdu_flag |= PDU_FIRST; 752 } 753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); 754 755 kfree(p_header); 756 757 if (ch->collect_len > 0) { 758 spin_lock_irqsave(&ch->collect_lock, saveflags); 759 skb_queue_tail(&ch->collect_queue, skb); 760 ch->collect_len += skb->len; 761 skb = skb_dequeue(&ch->collect_queue); 762 ch->collect_len -= skb->len; 763 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 764 } 765 766 p_header = (struct pdu *)skb->data; 767 p_header->pdu_flag |= PDU_LAST; 768 769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 770 771 header = kmalloc(TH_HEADER_LENGTH, gfp_type()); 772 if (!header) 773 goto nomem_exit; 774 775 header->th_seg = 0x00; 776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 777 header->th_blk_flag = 0x00; 778 header->th_is_xid = 0x00; /* Just data here */ 779 ch->th_seq_num++; 780 header->th_seq_num = ch->th_seq_num; 781 782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 783 __func__, dev->name, ch->th_seq_num); 784 785 /* put the TH on the packet */ 786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); 787 788 kfree(header); 789 790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 791 "up to 32 bytes sent to vtam:\n", 792 __func__, dev->name, skb->len); 793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 794 795 ch->ccw[4].count = skb->len; 796 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 797 /* 798 * idal allocation failed, try via copying to trans_skb. 799 * trans_skb usually has a pre-allocated idal. 800 */ 801 if (ctcm_checkalloc_buffer(ch)) { 802 /* 803 * Remove our header. 804 * It gets added again on retransmit. 805 */ 806 goto nomem_exit; 807 } 808 809 skb_reset_tail_pointer(ch->trans_skb); 810 ch->trans_skb->len = 0; 811 ch->ccw[1].count = skb->len; 812 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); 813 atomic_dec(&skb->users); 814 dev_kfree_skb_irq(skb); 815 ccw_idx = 0; 816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 817 "up to 32 bytes sent to vtam:\n", 818 __func__, dev->name, ch->trans_skb->len); 819 CTCM_D3_DUMP((char *)ch->trans_skb->data, 820 min_t(int, 32, ch->trans_skb->len)); 821 } else { 822 skb_queue_tail(&ch->io_queue, skb); 823 ccw_idx = 3; 824 } 825 ch->retry = 0; 826 fsm_newstate(ch->fsm, CTC_STATE_TX); 827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 828 829 if (do_debug_ccw) 830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 831 sizeof(struct ccw1) * 3); 832 833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 834 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 836 (unsigned long)ch, 0xff, 0); 837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 838 if (ccw_idx == 3) 839 ch->prof.doios_single++; 840 if (rc != 0) { 841 fsm_deltimer(&ch->timer); 842 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 843 if (ccw_idx == 3) 844 skb_dequeue_tail(&ch->io_queue); 845 } else if (ccw_idx == 0) { 846 priv->stats.tx_packets++; 847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 848 } 849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 850 ctcmpc_send_sweep_req(ch); 851 852 goto done; 853 nomem_exit: 854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 855 "%s(%s): MEMORY allocation ERROR\n", 856 CTCM_FUNTAIL, ch->id); 857 rc = -ENOMEM; 858 atomic_dec(&skb->users); 859 dev_kfree_skb_any(skb); 860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 861 done: 862 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 863 return rc; 864 } 865 866 /** 867 * Start transmission of a packet. 868 * Called from generic network device layer. 869 * 870 * skb Pointer to buffer containing the packet. 871 * dev Pointer to interface struct. 872 * 873 * returns 0 if packet consumed, !0 if packet rejected. 874 * Note: If we return !0, then the packet is free'd by 875 * the generic network layer. 876 */ 877 /* first merge version - leaving both functions separated */ 878 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) 879 { 880 struct ctcm_priv *priv = dev->ml_priv; 881 882 if (skb == NULL) { 883 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 884 "%s(%s): NULL sk_buff passed", 885 CTCM_FUNTAIL, dev->name); 886 priv->stats.tx_dropped++; 887 return NETDEV_TX_OK; 888 } 889 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 891 "%s(%s): Got sk_buff with head room < %ld bytes", 892 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 893 dev_kfree_skb(skb); 894 priv->stats.tx_dropped++; 895 return NETDEV_TX_OK; 896 } 897 898 /* 899 * If channels are not running, try to restart them 900 * and throw away packet. 901 */ 902 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 903 fsm_event(priv->fsm, DEV_EVENT_START, dev); 904 dev_kfree_skb(skb); 905 priv->stats.tx_dropped++; 906 priv->stats.tx_errors++; 907 priv->stats.tx_carrier_errors++; 908 return NETDEV_TX_OK; 909 } 910 911 if (ctcm_test_and_set_busy(dev)) 912 return NETDEV_TX_BUSY; 913 914 dev->trans_start = jiffies; 915 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 916 return NETDEV_TX_BUSY; 917 return NETDEV_TX_OK; 918 } 919 920 /* unmerged MPC variant of ctcm_tx */ 921 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 922 { 923 int len = 0; 924 struct ctcm_priv *priv = dev->ml_priv; 925 struct mpc_group *grp = priv->mpcg; 926 struct sk_buff *newskb = NULL; 927 928 /* 929 * Some sanity checks ... 930 */ 931 if (skb == NULL) { 932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 933 "%s(%s): NULL sk_buff passed", 934 CTCM_FUNTAIL, dev->name); 935 priv->stats.tx_dropped++; 936 goto done; 937 } 938 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 939 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 940 "%s(%s): Got sk_buff with head room < %ld bytes", 941 CTCM_FUNTAIL, dev->name, 942 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 943 944 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 945 946 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 947 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 948 949 if (!newskb) { 950 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 951 "%s: %s: __dev_alloc_skb failed", 952 __func__, dev->name); 953 954 dev_kfree_skb_any(skb); 955 priv->stats.tx_dropped++; 956 priv->stats.tx_errors++; 957 priv->stats.tx_carrier_errors++; 958 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 959 goto done; 960 } 961 newskb->protocol = skb->protocol; 962 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 963 memcpy(skb_put(newskb, skb->len), skb->data, skb->len); 964 dev_kfree_skb_any(skb); 965 skb = newskb; 966 } 967 968 /* 969 * If channels are not running, 970 * notify anybody about a link failure and throw 971 * away packet. 972 */ 973 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 974 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 975 dev_kfree_skb_any(skb); 976 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 977 "%s(%s): inactive MPCGROUP - dropped", 978 CTCM_FUNTAIL, dev->name); 979 priv->stats.tx_dropped++; 980 priv->stats.tx_errors++; 981 priv->stats.tx_carrier_errors++; 982 goto done; 983 } 984 985 if (ctcm_test_and_set_busy(dev)) { 986 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 987 "%s(%s): device busy - dropped", 988 CTCM_FUNTAIL, dev->name); 989 dev_kfree_skb_any(skb); 990 priv->stats.tx_dropped++; 991 priv->stats.tx_errors++; 992 priv->stats.tx_carrier_errors++; 993 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 994 goto done; 995 } 996 997 dev->trans_start = jiffies; 998 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 999 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1000 "%s(%s): device error - dropped", 1001 CTCM_FUNTAIL, dev->name); 1002 dev_kfree_skb_any(skb); 1003 priv->stats.tx_dropped++; 1004 priv->stats.tx_errors++; 1005 priv->stats.tx_carrier_errors++; 1006 ctcm_clear_busy(dev); 1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1008 goto done; 1009 } 1010 ctcm_clear_busy(dev); 1011 done: 1012 if (do_debug) 1013 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1014 1015 return NETDEV_TX_OK; /* handle freeing of skb here */ 1016 } 1017 1018 1019 /** 1020 * Sets MTU of an interface. 1021 * 1022 * dev Pointer to interface struct. 1023 * new_mtu The new MTU to use for this interface. 1024 * 1025 * returns 0 on success, -EINVAL if MTU is out of valid range. 1026 * (valid range is 576 .. 65527). If VM is on the 1027 * remote side, maximum MTU is 32760, however this is 1028 * not checked here. 1029 */ 1030 static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1031 { 1032 struct ctcm_priv *priv; 1033 int max_bufsize; 1034 1035 if (new_mtu < 576 || new_mtu > 65527) 1036 return -EINVAL; 1037 1038 priv = dev->ml_priv; 1039 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1040 1041 if (IS_MPC(priv)) { 1042 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1043 return -EINVAL; 1044 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1045 } else { 1046 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1047 return -EINVAL; 1048 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1049 } 1050 dev->mtu = new_mtu; 1051 return 0; 1052 } 1053 1054 /** 1055 * Returns interface statistics of a device. 1056 * 1057 * dev Pointer to interface struct. 1058 * 1059 * returns Pointer to stats struct of this interface. 1060 */ 1061 static struct net_device_stats *ctcm_stats(struct net_device *dev) 1062 { 1063 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1064 } 1065 1066 static void ctcm_free_netdevice(struct net_device *dev) 1067 { 1068 struct ctcm_priv *priv; 1069 struct mpc_group *grp; 1070 1071 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1072 "%s(%s)", CTCM_FUNTAIL, dev->name); 1073 priv = dev->ml_priv; 1074 if (priv) { 1075 grp = priv->mpcg; 1076 if (grp) { 1077 if (grp->fsm) 1078 kfree_fsm(grp->fsm); 1079 if (grp->xid_skb) 1080 dev_kfree_skb(grp->xid_skb); 1081 if (grp->rcvd_xid_skb) 1082 dev_kfree_skb(grp->rcvd_xid_skb); 1083 tasklet_kill(&grp->mpc_tasklet2); 1084 kfree(grp); 1085 priv->mpcg = NULL; 1086 } 1087 if (priv->fsm) { 1088 kfree_fsm(priv->fsm); 1089 priv->fsm = NULL; 1090 } 1091 kfree(priv->xid); 1092 priv->xid = NULL; 1093 /* 1094 * Note: kfree(priv); is done in "opposite" function of 1095 * allocator function probe_device which is remove_device. 1096 */ 1097 } 1098 #ifdef MODULE 1099 free_netdev(dev); 1100 #endif 1101 } 1102 1103 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1104 1105 static const struct net_device_ops ctcm_netdev_ops = { 1106 .ndo_open = ctcm_open, 1107 .ndo_stop = ctcm_close, 1108 .ndo_get_stats = ctcm_stats, 1109 .ndo_change_mtu = ctcm_change_mtu, 1110 .ndo_start_xmit = ctcm_tx, 1111 }; 1112 1113 static const struct net_device_ops ctcm_mpc_netdev_ops = { 1114 .ndo_open = ctcm_open, 1115 .ndo_stop = ctcm_close, 1116 .ndo_get_stats = ctcm_stats, 1117 .ndo_change_mtu = ctcm_change_mtu, 1118 .ndo_start_xmit = ctcmpc_tx, 1119 }; 1120 1121 void static ctcm_dev_setup(struct net_device *dev) 1122 { 1123 dev->type = ARPHRD_SLIP; 1124 dev->tx_queue_len = 100; 1125 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1126 } 1127 1128 /* 1129 * Initialize everything of the net device except the name and the 1130 * channel structs. 1131 */ 1132 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1133 { 1134 struct net_device *dev; 1135 struct mpc_group *grp; 1136 if (!priv) 1137 return NULL; 1138 1139 if (IS_MPC(priv)) 1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); 1141 else 1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); 1143 1144 if (!dev) { 1145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1146 "%s: MEMORY allocation ERROR", 1147 CTCM_FUNTAIL); 1148 return NULL; 1149 } 1150 dev->ml_priv = priv; 1151 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1152 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1153 dev_fsm, dev_fsm_len, GFP_KERNEL); 1154 if (priv->fsm == NULL) { 1155 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1156 free_netdev(dev); 1157 return NULL; 1158 } 1159 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1160 fsm_settimer(priv->fsm, &priv->restart_timer); 1161 1162 if (IS_MPC(priv)) { 1163 /* MPC Group Initializations */ 1164 grp = ctcmpc_init_mpc_group(priv); 1165 if (grp == NULL) { 1166 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1167 free_netdev(dev); 1168 return NULL; 1169 } 1170 tasklet_init(&grp->mpc_tasklet2, 1171 mpc_group_ready, (unsigned long)dev); 1172 dev->mtu = MPC_BUFSIZE_DEFAULT - 1173 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1174 1175 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1176 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1177 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1178 } else { 1179 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1180 dev->netdev_ops = &ctcm_netdev_ops; 1181 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1182 } 1183 1184 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1185 1186 return dev; 1187 } 1188 1189 /** 1190 * Main IRQ handler. 1191 * 1192 * cdev The ccw_device the interrupt is for. 1193 * intparm interruption parameter. 1194 * irb interruption response block. 1195 */ 1196 static void ctcm_irq_handler(struct ccw_device *cdev, 1197 unsigned long intparm, struct irb *irb) 1198 { 1199 struct channel *ch; 1200 struct net_device *dev; 1201 struct ctcm_priv *priv; 1202 struct ccwgroup_device *cgdev; 1203 int cstat; 1204 int dstat; 1205 1206 kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++; 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 */ 1306 static 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 */ 1351 static 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 1493 nomem_return: 1494 rc = -ENOMEM; 1495 1496 free_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 */ 1508 static 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 */ 1527 static 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; 1631 out_unregister: 1632 unregister_netdev(dev); 1633 out_dev: 1634 ctcm_free_netdevice(dev); 1635 out_ccw2: 1636 ccw_device_set_offline(cgdev->cdev[1]); 1637 out_ccw1: 1638 ccw_device_set_offline(cgdev->cdev[0]); 1639 out_remove_channel2: 1640 readc = channel_get(type, read_id, CTCM_READ); 1641 channel_remove(readc); 1642 out_remove_channel1: 1643 writec = channel_get(type, write_id, CTCM_WRITE); 1644 channel_remove(writec); 1645 out_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 */ 1656 static 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 1701 static 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 1719 static 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 1737 static 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); 1751 err_out: 1752 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1753 return rc; 1754 } 1755 1756 static 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 }; 1762 MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1763 1764 static struct ccw_driver ctcm_ccw_driver = { 1765 .driver = { 1766 .owner = THIS_MODULE, 1767 .name = "ctcm", 1768 }, 1769 .ids = ctcm_ids, 1770 .probe = ccwgroup_probe_ccwdev, 1771 .remove = ccwgroup_remove_ccwdev, 1772 }; 1773 1774 static struct ccwgroup_driver ctcm_group_driver = { 1775 .driver = { 1776 .owner = THIS_MODULE, 1777 .name = CTC_DRIVER_NAME, 1778 }, 1779 .max_slaves = 2, 1780 .driver_id = 0xC3E3C3D4, /* CTCM */ 1781 .probe = ctcm_probe_device, 1782 .remove = ctcm_remove_device, 1783 .set_online = ctcm_new_device, 1784 .set_offline = ctcm_shutdown_device, 1785 .freeze = ctcm_pm_suspend, 1786 .thaw = ctcm_pm_resume, 1787 .restore = ctcm_pm_resume, 1788 }; 1789 1790 static ssize_t 1791 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf, 1792 size_t count) 1793 { 1794 int err; 1795 1796 err = ccwgroup_create_from_string(ctcm_root_dev, 1797 ctcm_group_driver.driver_id, 1798 &ctcm_ccw_driver, 2, buf); 1799 return err ? err : count; 1800 } 1801 1802 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store); 1803 1804 static struct attribute *ctcm_group_attrs[] = { 1805 &driver_attr_group.attr, 1806 NULL, 1807 }; 1808 1809 static struct attribute_group ctcm_group_attr_group = { 1810 .attrs = ctcm_group_attrs, 1811 }; 1812 1813 static const struct attribute_group *ctcm_group_attr_groups[] = { 1814 &ctcm_group_attr_group, 1815 NULL, 1816 }; 1817 1818 /* 1819 * Module related routines 1820 */ 1821 1822 /* 1823 * Prepare to be unloaded. Free IRQ's and release all resources. 1824 * This is called just before this module is unloaded. It is 1825 * not called, if the usage count is !0, so we don't need to check 1826 * for that. 1827 */ 1828 static void __exit ctcm_exit(void) 1829 { 1830 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group); 1831 ccwgroup_driver_unregister(&ctcm_group_driver); 1832 ccw_driver_unregister(&ctcm_ccw_driver); 1833 root_device_unregister(ctcm_root_dev); 1834 ctcm_unregister_dbf_views(); 1835 pr_info("CTCM driver unloaded\n"); 1836 } 1837 1838 /* 1839 * Print Banner. 1840 */ 1841 static void print_banner(void) 1842 { 1843 pr_info("CTCM driver initialized\n"); 1844 } 1845 1846 /** 1847 * Initialize module. 1848 * This is called just after the module is loaded. 1849 * 1850 * returns 0 on success, !0 on error. 1851 */ 1852 static int __init ctcm_init(void) 1853 { 1854 int ret; 1855 1856 channels = NULL; 1857 1858 ret = ctcm_register_dbf_views(); 1859 if (ret) 1860 goto out_err; 1861 ctcm_root_dev = root_device_register("ctcm"); 1862 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0; 1863 if (ret) 1864 goto register_err; 1865 ret = ccw_driver_register(&ctcm_ccw_driver); 1866 if (ret) 1867 goto ccw_err; 1868 ctcm_group_driver.driver.groups = ctcm_group_attr_groups; 1869 ret = ccwgroup_driver_register(&ctcm_group_driver); 1870 if (ret) 1871 goto ccwgroup_err; 1872 print_banner(); 1873 return 0; 1874 1875 ccwgroup_err: 1876 ccw_driver_unregister(&ctcm_ccw_driver); 1877 ccw_err: 1878 root_device_unregister(ctcm_root_dev); 1879 register_err: 1880 ctcm_unregister_dbf_views(); 1881 out_err: 1882 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1883 __func__, ret); 1884 return ret; 1885 } 1886 1887 module_init(ctcm_init); 1888 module_exit(ctcm_exit); 1889 1890 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1891 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1892 MODULE_LICENSE("GPL"); 1893 1894