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