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