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 __u16 block_len; 676 677 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", 678 __func__, dev->name, smp_processor_id(), ch, 679 ch->id, fsm_getstate_str(ch->fsm)); 680 681 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { 682 spin_lock_irqsave(&ch->collect_lock, saveflags); 683 atomic_inc(&skb->users); 684 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 685 686 if (!p_header) { 687 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 688 goto nomem_exit; 689 } 690 691 p_header->pdu_offset = skb->len; 692 p_header->pdu_proto = 0x01; 693 p_header->pdu_flag = 0x00; 694 if (skb->protocol == ntohs(ETH_P_SNAP)) { 695 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 696 } else { 697 p_header->pdu_flag |= PDU_FIRST; 698 } 699 p_header->pdu_seq = 0; 700 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, 701 PDU_HEADER_LENGTH); 702 703 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" 704 "pdu header and data for up to 32 bytes:\n", 705 __func__, dev->name, skb->len); 706 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 707 708 skb_queue_tail(&ch->collect_queue, skb); 709 ch->collect_len += skb->len; 710 kfree(p_header); 711 712 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 713 goto done; 714 } 715 716 /* 717 * Protect skb against beeing free'd by upper 718 * layers. 719 */ 720 atomic_inc(&skb->users); 721 722 block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 723 /* 724 * IDAL support in CTCM is broken, so we have to 725 * care about skb's above 2G ourselves. 726 */ 727 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 728 if (hi) { 729 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 730 if (!nskb) { 731 goto nomem_exit; 732 } else { 733 memcpy(skb_put(nskb, skb->len), skb->data, skb->len); 734 atomic_inc(&nskb->users); 735 atomic_dec(&skb->users); 736 dev_kfree_skb_irq(skb); 737 skb = nskb; 738 } 739 } 740 741 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 742 743 if (!p_header) 744 goto nomem_exit; 745 746 p_header->pdu_offset = skb->len; 747 p_header->pdu_proto = 0x01; 748 p_header->pdu_flag = 0x00; 749 p_header->pdu_seq = 0; 750 if (skb->protocol == ntohs(ETH_P_SNAP)) { 751 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 752 } else { 753 p_header->pdu_flag |= PDU_FIRST; 754 } 755 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); 756 757 kfree(p_header); 758 759 if (ch->collect_len > 0) { 760 spin_lock_irqsave(&ch->collect_lock, saveflags); 761 skb_queue_tail(&ch->collect_queue, skb); 762 ch->collect_len += skb->len; 763 skb = skb_dequeue(&ch->collect_queue); 764 ch->collect_len -= skb->len; 765 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 766 } 767 768 p_header = (struct pdu *)skb->data; 769 p_header->pdu_flag |= PDU_LAST; 770 771 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 772 773 header = kmalloc(TH_HEADER_LENGTH, gfp_type()); 774 if (!header) 775 goto nomem_exit; 776 777 header->th_seg = 0x00; 778 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 779 header->th_blk_flag = 0x00; 780 header->th_is_xid = 0x00; /* Just data here */ 781 ch->th_seq_num++; 782 header->th_seq_num = ch->th_seq_num; 783 784 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 785 __func__, dev->name, ch->th_seq_num); 786 787 /* put the TH on the packet */ 788 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); 789 790 kfree(header); 791 792 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 793 "up to 32 bytes sent to vtam:\n", 794 __func__, dev->name, skb->len); 795 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 796 797 ch->ccw[4].count = skb->len; 798 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 799 /* 800 * idal allocation failed, try via copying to trans_skb. 801 * trans_skb usually has a pre-allocated idal. 802 */ 803 if (ctcm_checkalloc_buffer(ch)) { 804 /* 805 * Remove our header. 806 * It gets added again on retransmit. 807 */ 808 goto nomem_exit; 809 } 810 811 skb_reset_tail_pointer(ch->trans_skb); 812 ch->trans_skb->len = 0; 813 ch->ccw[1].count = skb->len; 814 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); 815 atomic_dec(&skb->users); 816 dev_kfree_skb_irq(skb); 817 ccw_idx = 0; 818 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 819 "up to 32 bytes sent to vtam:\n", 820 __func__, dev->name, ch->trans_skb->len); 821 CTCM_D3_DUMP((char *)ch->trans_skb->data, 822 min_t(int, 32, ch->trans_skb->len)); 823 } else { 824 skb_queue_tail(&ch->io_queue, skb); 825 ccw_idx = 3; 826 } 827 ch->retry = 0; 828 fsm_newstate(ch->fsm, CTC_STATE_TX); 829 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 830 831 if (do_debug_ccw) 832 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 833 sizeof(struct ccw1) * 3); 834 835 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 836 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 837 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 838 (unsigned long)ch, 0xff, 0); 839 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 840 if (ccw_idx == 3) 841 ch->prof.doios_single++; 842 if (rc != 0) { 843 fsm_deltimer(&ch->timer); 844 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 845 if (ccw_idx == 3) 846 skb_dequeue_tail(&ch->io_queue); 847 } else if (ccw_idx == 0) { 848 priv->stats.tx_packets++; 849 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 850 } 851 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 852 ctcmpc_send_sweep_req(ch); 853 854 goto done; 855 nomem_exit: 856 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 857 "%s(%s): MEMORY allocation ERROR\n", 858 CTCM_FUNTAIL, ch->id); 859 rc = -ENOMEM; 860 atomic_dec(&skb->users); 861 dev_kfree_skb_any(skb); 862 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 863 done: 864 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 865 return rc; 866 } 867 868 /** 869 * Start transmission of a packet. 870 * Called from generic network device layer. 871 * 872 * skb Pointer to buffer containing the packet. 873 * dev Pointer to interface struct. 874 * 875 * returns 0 if packet consumed, !0 if packet rejected. 876 * Note: If we return !0, then the packet is free'd by 877 * the generic network layer. 878 */ 879 /* first merge version - leaving both functions separated */ 880 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) 881 { 882 struct ctcm_priv *priv = dev->ml_priv; 883 884 if (skb == NULL) { 885 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 886 "%s(%s): NULL sk_buff passed", 887 CTCM_FUNTAIL, dev->name); 888 priv->stats.tx_dropped++; 889 return NETDEV_TX_OK; 890 } 891 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 892 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 893 "%s(%s): Got sk_buff with head room < %ld bytes", 894 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 895 dev_kfree_skb(skb); 896 priv->stats.tx_dropped++; 897 return NETDEV_TX_OK; 898 } 899 900 /* 901 * If channels are not running, try to restart them 902 * and throw away packet. 903 */ 904 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 905 fsm_event(priv->fsm, DEV_EVENT_START, dev); 906 dev_kfree_skb(skb); 907 priv->stats.tx_dropped++; 908 priv->stats.tx_errors++; 909 priv->stats.tx_carrier_errors++; 910 return NETDEV_TX_OK; 911 } 912 913 if (ctcm_test_and_set_busy(dev)) 914 return NETDEV_TX_BUSY; 915 916 dev->trans_start = jiffies; 917 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 918 return NETDEV_TX_BUSY; 919 return NETDEV_TX_OK; 920 } 921 922 /* unmerged MPC variant of ctcm_tx */ 923 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 924 { 925 int len = 0; 926 struct ctcm_priv *priv = dev->ml_priv; 927 struct mpc_group *grp = priv->mpcg; 928 struct sk_buff *newskb = NULL; 929 930 /* 931 * Some sanity checks ... 932 */ 933 if (skb == NULL) { 934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 935 "%s(%s): NULL sk_buff passed", 936 CTCM_FUNTAIL, dev->name); 937 priv->stats.tx_dropped++; 938 goto done; 939 } 940 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 941 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 942 "%s(%s): Got sk_buff with head room < %ld bytes", 943 CTCM_FUNTAIL, dev->name, 944 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 945 946 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 947 948 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 949 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 950 951 if (!newskb) { 952 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 953 "%s: %s: __dev_alloc_skb failed", 954 __func__, dev->name); 955 956 dev_kfree_skb_any(skb); 957 priv->stats.tx_dropped++; 958 priv->stats.tx_errors++; 959 priv->stats.tx_carrier_errors++; 960 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 961 goto done; 962 } 963 newskb->protocol = skb->protocol; 964 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 965 memcpy(skb_put(newskb, skb->len), skb->data, skb->len); 966 dev_kfree_skb_any(skb); 967 skb = newskb; 968 } 969 970 /* 971 * If channels are not running, 972 * notify anybody about a link failure and throw 973 * away packet. 974 */ 975 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 976 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 977 dev_kfree_skb_any(skb); 978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 979 "%s(%s): inactive MPCGROUP - dropped", 980 CTCM_FUNTAIL, dev->name); 981 priv->stats.tx_dropped++; 982 priv->stats.tx_errors++; 983 priv->stats.tx_carrier_errors++; 984 goto done; 985 } 986 987 if (ctcm_test_and_set_busy(dev)) { 988 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 989 "%s(%s): device busy - dropped", 990 CTCM_FUNTAIL, dev->name); 991 dev_kfree_skb_any(skb); 992 priv->stats.tx_dropped++; 993 priv->stats.tx_errors++; 994 priv->stats.tx_carrier_errors++; 995 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 996 goto done; 997 } 998 999 dev->trans_start = jiffies; 1000 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 1001 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1002 "%s(%s): device error - dropped", 1003 CTCM_FUNTAIL, dev->name); 1004 dev_kfree_skb_any(skb); 1005 priv->stats.tx_dropped++; 1006 priv->stats.tx_errors++; 1007 priv->stats.tx_carrier_errors++; 1008 ctcm_clear_busy(dev); 1009 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1010 goto done; 1011 } 1012 ctcm_clear_busy(dev); 1013 done: 1014 if (do_debug) 1015 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1016 1017 return NETDEV_TX_OK; /* handle freeing of skb here */ 1018 } 1019 1020 1021 /** 1022 * Sets MTU of an interface. 1023 * 1024 * dev Pointer to interface struct. 1025 * new_mtu The new MTU to use for this interface. 1026 * 1027 * returns 0 on success, -EINVAL if MTU is out of valid range. 1028 * (valid range is 576 .. 65527). If VM is on the 1029 * remote side, maximum MTU is 32760, however this is 1030 * not checked here. 1031 */ 1032 static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1033 { 1034 struct ctcm_priv *priv; 1035 int max_bufsize; 1036 1037 if (new_mtu < 576 || new_mtu > 65527) 1038 return -EINVAL; 1039 1040 priv = dev->ml_priv; 1041 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1042 1043 if (IS_MPC(priv)) { 1044 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1045 return -EINVAL; 1046 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1047 } else { 1048 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1049 return -EINVAL; 1050 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1051 } 1052 dev->mtu = new_mtu; 1053 return 0; 1054 } 1055 1056 /** 1057 * Returns interface statistics of a device. 1058 * 1059 * dev Pointer to interface struct. 1060 * 1061 * returns Pointer to stats struct of this interface. 1062 */ 1063 static struct net_device_stats *ctcm_stats(struct net_device *dev) 1064 { 1065 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1066 } 1067 1068 static void ctcm_free_netdevice(struct net_device *dev) 1069 { 1070 struct ctcm_priv *priv; 1071 struct mpc_group *grp; 1072 1073 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1074 "%s(%s)", CTCM_FUNTAIL, dev->name); 1075 priv = dev->ml_priv; 1076 if (priv) { 1077 grp = priv->mpcg; 1078 if (grp) { 1079 if (grp->fsm) 1080 kfree_fsm(grp->fsm); 1081 if (grp->xid_skb) 1082 dev_kfree_skb(grp->xid_skb); 1083 if (grp->rcvd_xid_skb) 1084 dev_kfree_skb(grp->rcvd_xid_skb); 1085 tasklet_kill(&grp->mpc_tasklet2); 1086 kfree(grp); 1087 priv->mpcg = NULL; 1088 } 1089 if (priv->fsm) { 1090 kfree_fsm(priv->fsm); 1091 priv->fsm = NULL; 1092 } 1093 kfree(priv->xid); 1094 priv->xid = NULL; 1095 /* 1096 * Note: kfree(priv); is done in "opposite" function of 1097 * allocator function probe_device which is remove_device. 1098 */ 1099 } 1100 #ifdef MODULE 1101 free_netdev(dev); 1102 #endif 1103 } 1104 1105 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1106 1107 static const struct net_device_ops ctcm_netdev_ops = { 1108 .ndo_open = ctcm_open, 1109 .ndo_stop = ctcm_close, 1110 .ndo_get_stats = ctcm_stats, 1111 .ndo_change_mtu = ctcm_change_mtu, 1112 .ndo_start_xmit = ctcm_tx, 1113 }; 1114 1115 static const struct net_device_ops ctcm_mpc_netdev_ops = { 1116 .ndo_open = ctcm_open, 1117 .ndo_stop = ctcm_close, 1118 .ndo_get_stats = ctcm_stats, 1119 .ndo_change_mtu = ctcm_change_mtu, 1120 .ndo_start_xmit = ctcmpc_tx, 1121 }; 1122 1123 void static ctcm_dev_setup(struct net_device *dev) 1124 { 1125 dev->type = ARPHRD_SLIP; 1126 dev->tx_queue_len = 100; 1127 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1128 } 1129 1130 /* 1131 * Initialize everything of the net device except the name and the 1132 * channel structs. 1133 */ 1134 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1135 { 1136 struct net_device *dev; 1137 struct mpc_group *grp; 1138 if (!priv) 1139 return NULL; 1140 1141 if (IS_MPC(priv)) 1142 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); 1143 else 1144 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); 1145 1146 if (!dev) { 1147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1148 "%s: MEMORY allocation ERROR", 1149 CTCM_FUNTAIL); 1150 return NULL; 1151 } 1152 dev->ml_priv = priv; 1153 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1154 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1155 dev_fsm, dev_fsm_len, GFP_KERNEL); 1156 if (priv->fsm == NULL) { 1157 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1158 free_netdev(dev); 1159 return NULL; 1160 } 1161 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1162 fsm_settimer(priv->fsm, &priv->restart_timer); 1163 1164 if (IS_MPC(priv)) { 1165 /* MPC Group Initializations */ 1166 grp = ctcmpc_init_mpc_group(priv); 1167 if (grp == NULL) { 1168 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1169 free_netdev(dev); 1170 return NULL; 1171 } 1172 tasklet_init(&grp->mpc_tasklet2, 1173 mpc_group_ready, (unsigned long)dev); 1174 dev->mtu = MPC_BUFSIZE_DEFAULT - 1175 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1176 1177 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1178 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1179 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1180 } else { 1181 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1182 dev->netdev_ops = &ctcm_netdev_ops; 1183 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1184 } 1185 1186 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1187 1188 return dev; 1189 } 1190 1191 /** 1192 * Main IRQ handler. 1193 * 1194 * cdev The ccw_device the interrupt is for. 1195 * intparm interruption parameter. 1196 * irb interruption response block. 1197 */ 1198 static void ctcm_irq_handler(struct ccw_device *cdev, 1199 unsigned long intparm, struct irb *irb) 1200 { 1201 struct channel *ch; 1202 struct net_device *dev; 1203 struct ctcm_priv *priv; 1204 struct ccwgroup_device *cgdev; 1205 int cstat; 1206 int dstat; 1207 1208 kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++; 1209 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1210 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); 1211 1212 if (ctcm_check_irb_error(cdev, irb)) 1213 return; 1214 1215 cgdev = dev_get_drvdata(&cdev->dev); 1216 1217 cstat = irb->scsw.cmd.cstat; 1218 dstat = irb->scsw.cmd.dstat; 1219 1220 /* Check for unsolicited interrupts. */ 1221 if (cgdev == NULL) { 1222 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, 1223 "%s(%s) unsolicited irq: c-%02x d-%02x\n", 1224 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); 1225 dev_warn(&cdev->dev, 1226 "The adapter received a non-specific IRQ\n"); 1227 return; 1228 } 1229 1230 priv = dev_get_drvdata(&cgdev->dev); 1231 1232 /* Try to extract channel from driver data. */ 1233 if (priv->channel[CTCM_READ]->cdev == cdev) 1234 ch = priv->channel[CTCM_READ]; 1235 else if (priv->channel[CTCM_WRITE]->cdev == cdev) 1236 ch = priv->channel[CTCM_WRITE]; 1237 else { 1238 dev_err(&cdev->dev, 1239 "%s: Internal error: Can't determine channel for " 1240 "interrupt device %s\n", 1241 __func__, dev_name(&cdev->dev)); 1242 /* Explain: inconsistent internal structures */ 1243 return; 1244 } 1245 1246 dev = ch->netdev; 1247 if (dev == NULL) { 1248 dev_err(&cdev->dev, 1249 "%s Internal error: net_device is NULL, ch = 0x%p\n", 1250 __func__, ch); 1251 /* Explain: inconsistent internal structures */ 1252 return; 1253 } 1254 1255 /* Copy interruption response block. */ 1256 memcpy(ch->irb, irb, sizeof(struct irb)); 1257 1258 /* Issue error message and return on subchannel error code */ 1259 if (irb->scsw.cmd.cstat) { 1260 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); 1261 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1262 "%s(%s): sub-ch check %s: cs=%02x ds=%02x", 1263 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); 1264 dev_warn(&cdev->dev, 1265 "A check occurred on the subchannel\n"); 1266 return; 1267 } 1268 1269 /* Check the reason-code of a unit check */ 1270 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 1271 if ((irb->ecw[0] & ch->sense_rc) == 0) 1272 /* print it only once */ 1273 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1274 "%s(%s): sense=%02x, ds=%02x", 1275 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); 1276 ccw_unit_check(ch, irb->ecw[0]); 1277 return; 1278 } 1279 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { 1280 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) 1281 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); 1282 else 1283 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); 1284 return; 1285 } 1286 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 1287 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); 1288 return; 1289 } 1290 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || 1291 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || 1292 (irb->scsw.cmd.stctl == 1293 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) 1294 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); 1295 else 1296 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); 1297 1298 } 1299 1300 /** 1301 * Add ctcm specific attributes. 1302 * Add ctcm private data. 1303 * 1304 * cgdev pointer to ccwgroup_device just added 1305 * 1306 * returns 0 on success, !0 on failure. 1307 */ 1308 static int ctcm_probe_device(struct ccwgroup_device *cgdev) 1309 { 1310 struct ctcm_priv *priv; 1311 int rc; 1312 1313 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1314 "%s %p", 1315 __func__, cgdev); 1316 1317 if (!get_device(&cgdev->dev)) 1318 return -ENODEV; 1319 1320 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); 1321 if (!priv) { 1322 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1323 "%s: memory allocation failure", 1324 CTCM_FUNTAIL); 1325 put_device(&cgdev->dev); 1326 return -ENOMEM; 1327 } 1328 1329 rc = ctcm_add_files(&cgdev->dev); 1330 if (rc) { 1331 kfree(priv); 1332 put_device(&cgdev->dev); 1333 return rc; 1334 } 1335 priv->buffer_size = CTCM_BUFSIZE_DEFAULT; 1336 cgdev->cdev[0]->handler = ctcm_irq_handler; 1337 cgdev->cdev[1]->handler = ctcm_irq_handler; 1338 dev_set_drvdata(&cgdev->dev, priv); 1339 1340 return 0; 1341 } 1342 1343 /** 1344 * Add a new channel to the list of channels. 1345 * Keeps the channel list sorted. 1346 * 1347 * cdev The ccw_device to be added. 1348 * type The type class of the new channel. 1349 * priv Points to the private data of the ccwgroup_device. 1350 * 1351 * returns 0 on success, !0 on error. 1352 */ 1353 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, 1354 struct ctcm_priv *priv) 1355 { 1356 struct channel **c = &channels; 1357 struct channel *ch; 1358 int ccw_num; 1359 int rc = 0; 1360 1361 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1362 "%s(%s), type %d, proto %d", 1363 __func__, dev_name(&cdev->dev), type, priv->protocol); 1364 1365 ch = kzalloc(sizeof(struct channel), GFP_KERNEL); 1366 if (ch == NULL) 1367 return -ENOMEM; 1368 1369 ch->protocol = priv->protocol; 1370 if (IS_MPC(priv)) { 1371 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1372 if (ch->discontact_th == NULL) 1373 goto nomem_return; 1374 1375 ch->discontact_th->th_blk_flag = TH_DISCONTACT; 1376 tasklet_init(&ch->ch_disc_tasklet, 1377 mpc_action_send_discontact, (unsigned long)ch); 1378 1379 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); 1380 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); 1381 ccw_num = 17; 1382 } else 1383 ccw_num = 8; 1384 1385 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); 1386 if (ch->ccw == NULL) 1387 goto nomem_return; 1388 1389 ch->cdev = cdev; 1390 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); 1391 ch->type = type; 1392 1393 /** 1394 * "static" ccws are used in the following way: 1395 * 1396 * ccw[0..2] (Channel program for generic I/O): 1397 * 0: prepare 1398 * 1: read or write (depending on direction) with fixed 1399 * buffer (idal allocated once when buffer is allocated) 1400 * 2: nop 1401 * ccw[3..5] (Channel program for direct write of packets) 1402 * 3: prepare 1403 * 4: write (idal allocated on every write). 1404 * 5: nop 1405 * ccw[6..7] (Channel program for initial channel setup): 1406 * 6: set extended mode 1407 * 7: nop 1408 * 1409 * ch->ccw[0..5] are initialized in ch_action_start because 1410 * the channel's direction is yet unknown here. 1411 * 1412 * ccws used for xid2 negotiations 1413 * ch-ccw[8-14] need to be used for the XID exchange either 1414 * X side XID2 Processing 1415 * 8: write control 1416 * 9: write th 1417 * 10: write XID 1418 * 11: read th from secondary 1419 * 12: read XID from secondary 1420 * 13: read 4 byte ID 1421 * 14: nop 1422 * Y side XID Processing 1423 * 8: sense 1424 * 9: read th 1425 * 10: read XID 1426 * 11: write th 1427 * 12: write XID 1428 * 13: write 4 byte ID 1429 * 14: nop 1430 * 1431 * ccws used for double noop due to VM timing issues 1432 * which result in unrecoverable Busy on channel 1433 * 15: nop 1434 * 16: nop 1435 */ 1436 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; 1437 ch->ccw[6].flags = CCW_FLAG_SLI; 1438 1439 ch->ccw[7].cmd_code = CCW_CMD_NOOP; 1440 ch->ccw[7].flags = CCW_FLAG_SLI; 1441 1442 if (IS_MPC(priv)) { 1443 ch->ccw[15].cmd_code = CCW_CMD_WRITE; 1444 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1445 ch->ccw[15].count = TH_HEADER_LENGTH; 1446 ch->ccw[15].cda = virt_to_phys(ch->discontact_th); 1447 1448 ch->ccw[16].cmd_code = CCW_CMD_NOOP; 1449 ch->ccw[16].flags = CCW_FLAG_SLI; 1450 1451 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1452 ctc_ch_event_names, CTC_MPC_NR_STATES, 1453 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, 1454 mpc_ch_fsm_len, GFP_KERNEL); 1455 } else { 1456 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1457 ctc_ch_event_names, CTC_NR_STATES, 1458 CTC_NR_EVENTS, ch_fsm, 1459 ch_fsm_len, GFP_KERNEL); 1460 } 1461 if (ch->fsm == NULL) 1462 goto free_return; 1463 1464 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 1465 1466 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); 1467 if (ch->irb == NULL) 1468 goto nomem_return; 1469 1470 while (*c && ctcm_less_than((*c)->id, ch->id)) 1471 c = &(*c)->next; 1472 1473 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { 1474 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1475 "%s (%s) already in list, using old entry", 1476 __func__, (*c)->id); 1477 1478 goto free_return; 1479 } 1480 1481 spin_lock_init(&ch->collect_lock); 1482 1483 fsm_settimer(ch->fsm, &ch->timer); 1484 skb_queue_head_init(&ch->io_queue); 1485 skb_queue_head_init(&ch->collect_queue); 1486 1487 if (IS_MPC(priv)) { 1488 fsm_settimer(ch->fsm, &ch->sweep_timer); 1489 skb_queue_head_init(&ch->sweep_queue); 1490 } 1491 ch->next = *c; 1492 *c = ch; 1493 return 0; 1494 1495 nomem_return: 1496 rc = -ENOMEM; 1497 1498 free_return: /* note that all channel pointers are 0 or valid */ 1499 kfree(ch->ccw); 1500 kfree(ch->discontact_th); 1501 kfree_fsm(ch->fsm); 1502 kfree(ch->irb); 1503 kfree(ch); 1504 return rc; 1505 } 1506 1507 /* 1508 * Return type of a detected device. 1509 */ 1510 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) 1511 { 1512 enum ctcm_channel_types type; 1513 type = (enum ctcm_channel_types)id->driver_info; 1514 1515 if (type == ctcm_channel_type_ficon) 1516 type = ctcm_channel_type_escon; 1517 1518 return type; 1519 } 1520 1521 /** 1522 * 1523 * Setup an interface. 1524 * 1525 * cgdev Device to be setup. 1526 * 1527 * returns 0 on success, !0 on failure. 1528 */ 1529 static int ctcm_new_device(struct ccwgroup_device *cgdev) 1530 { 1531 char read_id[CTCM_ID_SIZE]; 1532 char write_id[CTCM_ID_SIZE]; 1533 int direction; 1534 enum ctcm_channel_types type; 1535 struct ctcm_priv *priv; 1536 struct net_device *dev; 1537 struct ccw_device *cdev0; 1538 struct ccw_device *cdev1; 1539 struct channel *readc; 1540 struct channel *writec; 1541 int ret; 1542 int result; 1543 1544 priv = dev_get_drvdata(&cgdev->dev); 1545 if (!priv) { 1546 result = -ENODEV; 1547 goto out_err_result; 1548 } 1549 1550 cdev0 = cgdev->cdev[0]; 1551 cdev1 = cgdev->cdev[1]; 1552 1553 type = get_channel_type(&cdev0->id); 1554 1555 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); 1556 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); 1557 1558 ret = add_channel(cdev0, type, priv); 1559 if (ret) { 1560 result = ret; 1561 goto out_err_result; 1562 } 1563 ret = add_channel(cdev1, type, priv); 1564 if (ret) { 1565 result = ret; 1566 goto out_remove_channel1; 1567 } 1568 1569 ret = ccw_device_set_online(cdev0); 1570 if (ret != 0) { 1571 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1572 "%s(%s) set_online rc=%d", 1573 CTCM_FUNTAIL, read_id, ret); 1574 result = -EIO; 1575 goto out_remove_channel2; 1576 } 1577 1578 ret = ccw_device_set_online(cdev1); 1579 if (ret != 0) { 1580 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1581 "%s(%s) set_online rc=%d", 1582 CTCM_FUNTAIL, write_id, ret); 1583 1584 result = -EIO; 1585 goto out_ccw1; 1586 } 1587 1588 dev = ctcm_init_netdevice(priv); 1589 if (dev == NULL) { 1590 result = -ENODEV; 1591 goto out_ccw2; 1592 } 1593 1594 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1595 priv->channel[direction] = 1596 channel_get(type, direction == CTCM_READ ? 1597 read_id : write_id, direction); 1598 if (priv->channel[direction] == NULL) { 1599 if (direction == CTCM_WRITE) 1600 channel_free(priv->channel[CTCM_READ]); 1601 goto out_dev; 1602 } 1603 priv->channel[direction]->netdev = dev; 1604 priv->channel[direction]->protocol = priv->protocol; 1605 priv->channel[direction]->max_bufsize = priv->buffer_size; 1606 } 1607 /* sysfs magic */ 1608 SET_NETDEV_DEV(dev, &cgdev->dev); 1609 1610 if (register_netdev(dev)) { 1611 result = -ENODEV; 1612 goto out_dev; 1613 } 1614 1615 if (ctcm_add_attributes(&cgdev->dev)) { 1616 result = -ENODEV; 1617 goto out_unregister; 1618 } 1619 1620 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1621 1622 dev_info(&dev->dev, 1623 "setup OK : r/w = %s/%s, protocol : %d\n", 1624 priv->channel[CTCM_READ]->id, 1625 priv->channel[CTCM_WRITE]->id, priv->protocol); 1626 1627 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1628 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1629 priv->channel[CTCM_READ]->id, 1630 priv->channel[CTCM_WRITE]->id, priv->protocol); 1631 1632 return 0; 1633 out_unregister: 1634 unregister_netdev(dev); 1635 out_dev: 1636 ctcm_free_netdevice(dev); 1637 out_ccw2: 1638 ccw_device_set_offline(cgdev->cdev[1]); 1639 out_ccw1: 1640 ccw_device_set_offline(cgdev->cdev[0]); 1641 out_remove_channel2: 1642 readc = channel_get(type, read_id, CTCM_READ); 1643 channel_remove(readc); 1644 out_remove_channel1: 1645 writec = channel_get(type, write_id, CTCM_WRITE); 1646 channel_remove(writec); 1647 out_err_result: 1648 return result; 1649 } 1650 1651 /** 1652 * Shutdown an interface. 1653 * 1654 * cgdev Device to be shut down. 1655 * 1656 * returns 0 on success, !0 on failure. 1657 */ 1658 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1659 { 1660 struct ctcm_priv *priv; 1661 struct net_device *dev; 1662 1663 priv = dev_get_drvdata(&cgdev->dev); 1664 if (!priv) 1665 return -ENODEV; 1666 1667 if (priv->channel[CTCM_READ]) { 1668 dev = priv->channel[CTCM_READ]->netdev; 1669 CTCM_DBF_DEV(SETUP, dev, ""); 1670 /* Close the device */ 1671 ctcm_close(dev); 1672 dev->flags &= ~IFF_RUNNING; 1673 ctcm_remove_attributes(&cgdev->dev); 1674 channel_free(priv->channel[CTCM_READ]); 1675 } else 1676 dev = NULL; 1677 1678 if (priv->channel[CTCM_WRITE]) 1679 channel_free(priv->channel[CTCM_WRITE]); 1680 1681 if (dev) { 1682 unregister_netdev(dev); 1683 ctcm_free_netdevice(dev); 1684 } 1685 1686 if (priv->fsm) 1687 kfree_fsm(priv->fsm); 1688 1689 ccw_device_set_offline(cgdev->cdev[1]); 1690 ccw_device_set_offline(cgdev->cdev[0]); 1691 1692 if (priv->channel[CTCM_READ]) 1693 channel_remove(priv->channel[CTCM_READ]); 1694 if (priv->channel[CTCM_WRITE]) 1695 channel_remove(priv->channel[CTCM_WRITE]); 1696 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1697 1698 return 0; 1699 1700 } 1701 1702 1703 static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1704 { 1705 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1706 1707 BUG_ON(priv == NULL); 1708 1709 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1710 "removing device %p, proto : %d", 1711 cgdev, priv->protocol); 1712 1713 if (cgdev->state == CCWGROUP_ONLINE) 1714 ctcm_shutdown_device(cgdev); 1715 ctcm_remove_files(&cgdev->dev); 1716 dev_set_drvdata(&cgdev->dev, NULL); 1717 kfree(priv); 1718 put_device(&cgdev->dev); 1719 } 1720 1721 static int ctcm_pm_suspend(struct ccwgroup_device *gdev) 1722 { 1723 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1724 1725 if (gdev->state == CCWGROUP_OFFLINE) 1726 return 0; 1727 netif_device_detach(priv->channel[CTCM_READ]->netdev); 1728 ctcm_close(priv->channel[CTCM_READ]->netdev); 1729 if (!wait_event_timeout(priv->fsm->wait_q, 1730 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { 1731 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1732 return -EBUSY; 1733 } 1734 ccw_device_set_offline(gdev->cdev[1]); 1735 ccw_device_set_offline(gdev->cdev[0]); 1736 return 0; 1737 } 1738 1739 static int ctcm_pm_resume(struct ccwgroup_device *gdev) 1740 { 1741 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1742 int rc; 1743 1744 if (gdev->state == CCWGROUP_OFFLINE) 1745 return 0; 1746 rc = ccw_device_set_online(gdev->cdev[1]); 1747 if (rc) 1748 goto err_out; 1749 rc = ccw_device_set_online(gdev->cdev[0]); 1750 if (rc) 1751 goto err_out; 1752 ctcm_open(priv->channel[CTCM_READ]->netdev); 1753 err_out: 1754 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1755 return rc; 1756 } 1757 1758 static struct ccw_device_id ctcm_ids[] = { 1759 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1760 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1761 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1762 {}, 1763 }; 1764 MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1765 1766 static struct ccw_driver ctcm_ccw_driver = { 1767 .owner = THIS_MODULE, 1768 .name = "ctcm", 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 .owner = THIS_MODULE, 1776 .name = CTC_DRIVER_NAME, 1777 .max_slaves = 2, 1778 .driver_id = 0xC3E3C3D4, /* CTCM */ 1779 .probe = ctcm_probe_device, 1780 .remove = ctcm_remove_device, 1781 .set_online = ctcm_new_device, 1782 .set_offline = ctcm_shutdown_device, 1783 .freeze = ctcm_pm_suspend, 1784 .thaw = ctcm_pm_resume, 1785 .restore = ctcm_pm_resume, 1786 }; 1787 1788 static ssize_t 1789 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf, 1790 size_t count) 1791 { 1792 int err; 1793 1794 err = ccwgroup_create_from_string(ctcm_root_dev, 1795 ctcm_group_driver.driver_id, 1796 &ctcm_ccw_driver, 2, buf); 1797 return err ? err : count; 1798 } 1799 1800 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store); 1801 1802 static struct attribute *ctcm_group_attrs[] = { 1803 &driver_attr_group.attr, 1804 NULL, 1805 }; 1806 1807 static struct attribute_group ctcm_group_attr_group = { 1808 .attrs = ctcm_group_attrs, 1809 }; 1810 1811 static const struct attribute_group *ctcm_group_attr_groups[] = { 1812 &ctcm_group_attr_group, 1813 NULL, 1814 }; 1815 1816 /* 1817 * Module related routines 1818 */ 1819 1820 /* 1821 * Prepare to be unloaded. Free IRQ's and release all resources. 1822 * This is called just before this module is unloaded. It is 1823 * not called, if the usage count is !0, so we don't need to check 1824 * for that. 1825 */ 1826 static void __exit ctcm_exit(void) 1827 { 1828 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group); 1829 ccwgroup_driver_unregister(&ctcm_group_driver); 1830 ccw_driver_unregister(&ctcm_ccw_driver); 1831 root_device_unregister(ctcm_root_dev); 1832 ctcm_unregister_dbf_views(); 1833 pr_info("CTCM driver unloaded\n"); 1834 } 1835 1836 /* 1837 * Print Banner. 1838 */ 1839 static void print_banner(void) 1840 { 1841 pr_info("CTCM driver initialized\n"); 1842 } 1843 1844 /** 1845 * Initialize module. 1846 * This is called just after the module is loaded. 1847 * 1848 * returns 0 on success, !0 on error. 1849 */ 1850 static int __init ctcm_init(void) 1851 { 1852 int ret; 1853 1854 channels = NULL; 1855 1856 ret = ctcm_register_dbf_views(); 1857 if (ret) 1858 goto out_err; 1859 ctcm_root_dev = root_device_register("ctcm"); 1860 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0; 1861 if (ret) 1862 goto register_err; 1863 ret = ccw_driver_register(&ctcm_ccw_driver); 1864 if (ret) 1865 goto ccw_err; 1866 ctcm_group_driver.driver.groups = ctcm_group_attr_groups; 1867 ret = ccwgroup_driver_register(&ctcm_group_driver); 1868 if (ret) 1869 goto ccwgroup_err; 1870 print_banner(); 1871 return 0; 1872 1873 ccwgroup_err: 1874 ccw_driver_unregister(&ctcm_ccw_driver); 1875 ccw_err: 1876 root_device_unregister(ctcm_root_dev); 1877 register_err: 1878 ctcm_unregister_dbf_views(); 1879 out_err: 1880 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1881 __func__, ret); 1882 return ret; 1883 } 1884 1885 module_init(ctcm_init); 1886 module_exit(ctcm_exit); 1887 1888 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1889 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1890 MODULE_LICENSE("GPL"); 1891 1892