1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2001, 2009 4 * Author(s): 5 * Original CTC driver(s): 6 * Fritz Elfert (felfert@millenux.com) 7 * Dieter Wellerdiek (wel@de.ibm.com) 8 * Martin Schwidefsky (schwidefsky@de.ibm.com) 9 * Denis Joseph Barrow (barrow_dj@yahoo.com) 10 * Jochen Roehrig (roehrig@de.ibm.com) 11 * Cornelia Huck <cornelia.huck@de.ibm.com> 12 * MPC additions: 13 * Belinda Thompson (belindat@us.ibm.com) 14 * Andy Richter (richtera@us.ibm.com) 15 * Revived by: 16 * Peter Tiedemann (ptiedem@de.ibm.com) 17 */ 18 19 #undef DEBUG 20 #undef DEBUGDATA 21 #undef DEBUGCCW 22 23 #define KMSG_COMPONENT "ctcm" 24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 25 26 #include <linux/module.h> 27 #include <linux/init.h> 28 #include <linux/kernel.h> 29 #include <linux/slab.h> 30 #include <linux/errno.h> 31 #include <linux/types.h> 32 #include <linux/interrupt.h> 33 #include <linux/timer.h> 34 #include <linux/bitops.h> 35 36 #include <linux/signal.h> 37 #include <linux/string.h> 38 39 #include <linux/ip.h> 40 #include <linux/if_arp.h> 41 #include <linux/tcp.h> 42 #include <linux/skbuff.h> 43 #include <linux/ctype.h> 44 #include <net/dst.h> 45 46 #include <linux/io.h> 47 #include <asm/ccwdev.h> 48 #include <asm/ccwgroup.h> 49 #include <linux/uaccess.h> 50 51 #include <asm/idals.h> 52 53 #include "ctcm_fsms.h" 54 #include "ctcm_main.h" 55 56 /* Some common global variables */ 57 58 /** 59 * The root device for ctcm group devices 60 */ 61 static struct device *ctcm_root_dev; 62 63 /* 64 * Linked list of all detected channels. 65 */ 66 struct channel *channels; 67 68 /** 69 * Unpack a just received skb and hand it over to 70 * upper layers. 71 * 72 * ch The channel where this skb has been received. 73 * pskb The received skb. 74 */ 75 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) 76 { 77 struct net_device *dev = ch->netdev; 78 struct ctcm_priv *priv = dev->ml_priv; 79 __u16 len = *((__u16 *) pskb->data); 80 81 skb_put(pskb, 2 + LL_HEADER_LENGTH); 82 skb_pull(pskb, 2); 83 pskb->dev = dev; 84 pskb->ip_summed = CHECKSUM_UNNECESSARY; 85 while (len > 0) { 86 struct sk_buff *skb; 87 int skblen; 88 struct ll_header *header = (struct ll_header *)pskb->data; 89 90 skb_pull(pskb, LL_HEADER_LENGTH); 91 if ((ch->protocol == CTCM_PROTO_S390) && 92 (header->type != ETH_P_IP)) { 93 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { 94 ch->logflags |= LOG_FLAG_ILLEGALPKT; 95 /* 96 * Check packet type only if we stick strictly 97 * to S/390's protocol of OS390. This only 98 * supports IP. Otherwise allow any packet 99 * type. 100 */ 101 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 102 "%s(%s): Illegal packet type 0x%04x" 103 " - dropping", 104 CTCM_FUNTAIL, dev->name, header->type); 105 } 106 priv->stats.rx_dropped++; 107 priv->stats.rx_frame_errors++; 108 return; 109 } 110 pskb->protocol = cpu_to_be16(header->type); 111 if ((header->length <= LL_HEADER_LENGTH) || 112 (len <= LL_HEADER_LENGTH)) { 113 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { 114 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 115 "%s(%s): Illegal packet size %d(%d,%d)" 116 "- dropping", 117 CTCM_FUNTAIL, dev->name, 118 header->length, dev->mtu, len); 119 ch->logflags |= LOG_FLAG_ILLEGALSIZE; 120 } 121 122 priv->stats.rx_dropped++; 123 priv->stats.rx_length_errors++; 124 return; 125 } 126 header->length -= LL_HEADER_LENGTH; 127 len -= LL_HEADER_LENGTH; 128 if ((header->length > skb_tailroom(pskb)) || 129 (header->length > len)) { 130 if (!(ch->logflags & LOG_FLAG_OVERRUN)) { 131 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 132 "%s(%s): Packet size %d (overrun)" 133 " - dropping", CTCM_FUNTAIL, 134 dev->name, header->length); 135 ch->logflags |= LOG_FLAG_OVERRUN; 136 } 137 138 priv->stats.rx_dropped++; 139 priv->stats.rx_length_errors++; 140 return; 141 } 142 skb_put(pskb, header->length); 143 skb_reset_mac_header(pskb); 144 len -= header->length; 145 skb = dev_alloc_skb(pskb->len); 146 if (!skb) { 147 if (!(ch->logflags & LOG_FLAG_NOMEM)) { 148 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 149 "%s(%s): MEMORY allocation error", 150 CTCM_FUNTAIL, dev->name); 151 ch->logflags |= LOG_FLAG_NOMEM; 152 } 153 priv->stats.rx_dropped++; 154 return; 155 } 156 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), 157 pskb->len); 158 skb_reset_mac_header(skb); 159 skb->dev = pskb->dev; 160 skb->protocol = pskb->protocol; 161 pskb->ip_summed = CHECKSUM_UNNECESSARY; 162 skblen = skb->len; 163 /* 164 * reset logflags 165 */ 166 ch->logflags = 0; 167 priv->stats.rx_packets++; 168 priv->stats.rx_bytes += skblen; 169 netif_rx_ni(skb); 170 if (len > 0) { 171 skb_pull(pskb, header->length); 172 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { 173 CTCM_DBF_DEV_NAME(TRACE, dev, 174 "Overrun in ctcm_unpack_skb"); 175 ch->logflags |= LOG_FLAG_OVERRUN; 176 return; 177 } 178 skb_put(pskb, LL_HEADER_LENGTH); 179 } 180 } 181 } 182 183 /** 184 * Release a specific channel in the channel list. 185 * 186 * ch Pointer to channel struct to be released. 187 */ 188 static void channel_free(struct channel *ch) 189 { 190 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); 191 ch->flags &= ~CHANNEL_FLAGS_INUSE; 192 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 193 } 194 195 /** 196 * Remove a specific channel in the channel list. 197 * 198 * ch Pointer to channel struct to be released. 199 */ 200 static void channel_remove(struct channel *ch) 201 { 202 struct channel **c = &channels; 203 char chid[CTCM_ID_SIZE+1]; 204 int ok = 0; 205 206 if (ch == NULL) 207 return; 208 else 209 strncpy(chid, ch->id, CTCM_ID_SIZE); 210 211 channel_free(ch); 212 while (*c) { 213 if (*c == ch) { 214 *c = ch->next; 215 fsm_deltimer(&ch->timer); 216 if (IS_MPC(ch)) 217 fsm_deltimer(&ch->sweep_timer); 218 219 kfree_fsm(ch->fsm); 220 clear_normalized_cda(&ch->ccw[4]); 221 if (ch->trans_skb != NULL) { 222 clear_normalized_cda(&ch->ccw[1]); 223 dev_kfree_skb_any(ch->trans_skb); 224 } 225 if (IS_MPC(ch)) { 226 tasklet_kill(&ch->ch_tasklet); 227 tasklet_kill(&ch->ch_disc_tasklet); 228 kfree(ch->discontact_th); 229 } 230 kfree(ch->ccw); 231 kfree(ch->irb); 232 kfree(ch); 233 ok = 1; 234 break; 235 } 236 c = &((*c)->next); 237 } 238 239 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, 240 chid, ok ? "OK" : "failed"); 241 } 242 243 /** 244 * Get a specific channel from the channel list. 245 * 246 * type Type of channel we are interested in. 247 * id Id of channel we are interested in. 248 * direction Direction we want to use this channel for. 249 * 250 * returns Pointer to a channel or NULL if no matching channel available. 251 */ 252 static struct channel *channel_get(enum ctcm_channel_types type, 253 char *id, int direction) 254 { 255 struct channel *ch = channels; 256 257 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) 258 ch = ch->next; 259 if (!ch) { 260 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 261 "%s(%d, %s, %d) not found in channel list\n", 262 CTCM_FUNTAIL, type, id, direction); 263 } else { 264 if (ch->flags & CHANNEL_FLAGS_INUSE) 265 ch = NULL; 266 else { 267 ch->flags |= CHANNEL_FLAGS_INUSE; 268 ch->flags &= ~CHANNEL_FLAGS_RWMASK; 269 ch->flags |= (direction == CTCM_WRITE) 270 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; 271 fsm_newstate(ch->fsm, CTC_STATE_STOPPED); 272 } 273 } 274 return ch; 275 } 276 277 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) 278 { 279 if (!IS_ERR(irb)) 280 return 0; 281 282 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, 283 "irb error %ld on device %s\n", 284 PTR_ERR(irb), dev_name(&cdev->dev)); 285 286 switch (PTR_ERR(irb)) { 287 case -EIO: 288 dev_err(&cdev->dev, 289 "An I/O-error occurred on the CTCM device\n"); 290 break; 291 case -ETIMEDOUT: 292 dev_err(&cdev->dev, 293 "An adapter hardware operation timed out\n"); 294 break; 295 default: 296 dev_err(&cdev->dev, 297 "An error occurred on the adapter hardware\n"); 298 } 299 return PTR_ERR(irb); 300 } 301 302 303 /** 304 * Check sense of a unit check. 305 * 306 * ch The channel, the sense code belongs to. 307 * sense The sense code to inspect. 308 */ 309 static void ccw_unit_check(struct channel *ch, __u8 sense) 310 { 311 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 312 "%s(%s): %02x", 313 CTCM_FUNTAIL, ch->id, sense); 314 315 if (sense & SNS0_INTERVENTION_REQ) { 316 if (sense & 0x01) { 317 if (ch->sense_rc != 0x01) { 318 pr_notice( 319 "%s: The communication peer has " 320 "disconnected\n", ch->id); 321 ch->sense_rc = 0x01; 322 } 323 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); 324 } else { 325 if (ch->sense_rc != SNS0_INTERVENTION_REQ) { 326 pr_notice( 327 "%s: The remote operating system is " 328 "not available\n", ch->id); 329 ch->sense_rc = SNS0_INTERVENTION_REQ; 330 } 331 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); 332 } 333 } else if (sense & SNS0_EQUIPMENT_CHECK) { 334 if (sense & SNS0_BUS_OUT_CHECK) { 335 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 336 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 337 "%s(%s): remote HW error %02x", 338 CTCM_FUNTAIL, ch->id, sense); 339 ch->sense_rc = SNS0_BUS_OUT_CHECK; 340 } 341 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); 342 } else { 343 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { 344 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 345 "%s(%s): remote read parity error %02x", 346 CTCM_FUNTAIL, ch->id, sense); 347 ch->sense_rc = SNS0_EQUIPMENT_CHECK; 348 } 349 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); 350 } 351 } else if (sense & SNS0_BUS_OUT_CHECK) { 352 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { 353 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 354 "%s(%s): BUS OUT error %02x", 355 CTCM_FUNTAIL, ch->id, sense); 356 ch->sense_rc = SNS0_BUS_OUT_CHECK; 357 } 358 if (sense & 0x04) /* data-streaming timeout */ 359 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); 360 else /* Data-transfer parity error */ 361 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); 362 } else if (sense & SNS0_CMD_REJECT) { 363 if (ch->sense_rc != SNS0_CMD_REJECT) { 364 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 365 "%s(%s): Command rejected", 366 CTCM_FUNTAIL, ch->id); 367 ch->sense_rc = SNS0_CMD_REJECT; 368 } 369 } else if (sense == 0) { 370 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 371 "%s(%s): Unit check ZERO", 372 CTCM_FUNTAIL, ch->id); 373 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); 374 } else { 375 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 376 "%s(%s): Unit check code %02x unknown", 377 CTCM_FUNTAIL, ch->id, sense); 378 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); 379 } 380 } 381 382 int ctcm_ch_alloc_buffer(struct channel *ch) 383 { 384 clear_normalized_cda(&ch->ccw[1]); 385 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); 386 if (ch->trans_skb == NULL) { 387 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 388 "%s(%s): %s trans_skb allocation error", 389 CTCM_FUNTAIL, ch->id, 390 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 391 "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) == CTCM_READ) ? 403 "RX" : "TX"); 404 return -ENOMEM; 405 } 406 407 ch->ccw[1].count = 0; 408 ch->trans_skb_data = ch->trans_skb->data; 409 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; 410 return 0; 411 } 412 413 /* 414 * Interface API for upper network layers 415 */ 416 417 /** 418 * Open an interface. 419 * Called from generic network layer when ifconfig up is run. 420 * 421 * dev Pointer to interface struct. 422 * 423 * returns 0 on success, -ERRNO on failure. (Never fails.) 424 */ 425 int ctcm_open(struct net_device *dev) 426 { 427 struct ctcm_priv *priv = dev->ml_priv; 428 429 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 430 if (!IS_MPC(priv)) 431 fsm_event(priv->fsm, DEV_EVENT_START, dev); 432 return 0; 433 } 434 435 /** 436 * Close an interface. 437 * Called from generic network layer when ifconfig down is run. 438 * 439 * dev Pointer to interface struct. 440 * 441 * returns 0 on success, -ERRNO on failure. (Never fails.) 442 */ 443 int ctcm_close(struct net_device *dev) 444 { 445 struct ctcm_priv *priv = dev->ml_priv; 446 447 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 448 if (!IS_MPC(priv)) 449 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 450 return 0; 451 } 452 453 454 /** 455 * Transmit a packet. 456 * This is a helper function for ctcm_tx(). 457 * 458 * ch Channel to be used for sending. 459 * skb Pointer to struct sk_buff of packet to send. 460 * The linklevel header has already been set up 461 * by ctcm_tx(). 462 * 463 * returns 0 on success, -ERRNO on failure. (Never fails.) 464 */ 465 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) 466 { 467 unsigned long saveflags; 468 struct ll_header header; 469 int rc = 0; 470 __u16 block_len; 471 int ccw_idx; 472 struct sk_buff *nskb; 473 unsigned long hi; 474 475 /* we need to acquire the lock for testing the state 476 * otherwise we can have an IRQ changing the state to 477 * TXIDLE after the test but before acquiring the lock. 478 */ 479 spin_lock_irqsave(&ch->collect_lock, saveflags); 480 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { 481 int l = skb->len + LL_HEADER_LENGTH; 482 483 if (ch->collect_len + l > ch->max_bufsize - 2) { 484 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 485 return -EBUSY; 486 } else { 487 refcount_inc(&skb->users); 488 header.length = l; 489 header.type = be16_to_cpu(skb->protocol); 490 header.unused = 0; 491 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, 492 LL_HEADER_LENGTH); 493 skb_queue_tail(&ch->collect_queue, skb); 494 ch->collect_len += l; 495 } 496 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 497 goto done; 498 } 499 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 500 /* 501 * Protect skb against beeing free'd by upper 502 * layers. 503 */ 504 refcount_inc(&skb->users); 505 ch->prof.txlen += skb->len; 506 header.length = skb->len + LL_HEADER_LENGTH; 507 header.type = be16_to_cpu(skb->protocol); 508 header.unused = 0; 509 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); 510 block_len = skb->len + 2; 511 *((__u16 *)skb_push(skb, 2)) = block_len; 512 513 /* 514 * IDAL support in CTCM is broken, so we have to 515 * care about skb's above 2G ourselves. 516 */ 517 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; 518 if (hi) { 519 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 520 if (!nskb) { 521 refcount_dec(&skb->users); 522 skb_pull(skb, LL_HEADER_LENGTH + 2); 523 ctcm_clear_busy(ch->netdev); 524 return -ENOMEM; 525 } else { 526 skb_put_data(nskb, skb->data, skb->len); 527 refcount_inc(&nskb->users); 528 refcount_dec(&skb->users); 529 dev_kfree_skb_irq(skb); 530 skb = nskb; 531 } 532 } 533 534 ch->ccw[4].count = block_len; 535 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 536 /* 537 * idal allocation failed, try via copying to 538 * trans_skb. trans_skb usually has a pre-allocated 539 * idal. 540 */ 541 if (ctcm_checkalloc_buffer(ch)) { 542 /* 543 * Remove our header. It gets added 544 * again on retransmit. 545 */ 546 refcount_dec(&skb->users); 547 skb_pull(skb, LL_HEADER_LENGTH + 2); 548 ctcm_clear_busy(ch->netdev); 549 return -ENOMEM; 550 } 551 552 skb_reset_tail_pointer(ch->trans_skb); 553 ch->trans_skb->len = 0; 554 ch->ccw[1].count = skb->len; 555 skb_copy_from_linear_data(skb, 556 skb_put(ch->trans_skb, skb->len), skb->len); 557 refcount_dec(&skb->users); 558 dev_kfree_skb_irq(skb); 559 ccw_idx = 0; 560 } else { 561 skb_queue_tail(&ch->io_queue, skb); 562 ccw_idx = 3; 563 } 564 if (do_debug_ccw) 565 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 566 sizeof(struct ccw1) * 3); 567 ch->retry = 0; 568 fsm_newstate(ch->fsm, CTC_STATE_TX); 569 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 571 ch->prof.send_stamp = jiffies; 572 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 573 (unsigned long)ch, 0xff, 0); 574 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 575 if (ccw_idx == 3) 576 ch->prof.doios_single++; 577 if (rc != 0) { 578 fsm_deltimer(&ch->timer); 579 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 580 if (ccw_idx == 3) 581 skb_dequeue_tail(&ch->io_queue); 582 /* 583 * Remove our header. It gets added 584 * again on retransmit. 585 */ 586 skb_pull(skb, LL_HEADER_LENGTH + 2); 587 } else if (ccw_idx == 0) { 588 struct net_device *dev = ch->netdev; 589 struct ctcm_priv *priv = dev->ml_priv; 590 priv->stats.tx_packets++; 591 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 592 } 593 done: 594 ctcm_clear_busy(ch->netdev); 595 return rc; 596 } 597 598 static void ctcmpc_send_sweep_req(struct channel *rch) 599 { 600 struct net_device *dev = rch->netdev; 601 struct ctcm_priv *priv; 602 struct mpc_group *grp; 603 struct th_sweep *header; 604 struct sk_buff *sweep_skb; 605 struct channel *ch; 606 /* int rc = 0; */ 607 608 priv = dev->ml_priv; 609 grp = priv->mpcg; 610 ch = priv->channel[CTCM_WRITE]; 611 612 /* sweep processing is not complete until response and request */ 613 /* has completed for all read channels in group */ 614 if (grp->in_sweep == 0) { 615 grp->in_sweep = 1; 616 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 617 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 618 } 619 620 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 621 622 if (sweep_skb == NULL) { 623 /* rc = -ENOMEM; */ 624 goto nomem; 625 } 626 627 header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); 628 629 if (!header) { 630 dev_kfree_skb_any(sweep_skb); 631 /* rc = -ENOMEM; */ 632 goto nomem; 633 } 634 635 header->th.th_seg = 0x00 ; 636 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ 637 header->th.th_blk_flag = 0x00; 638 header->th.th_is_xid = 0x00; 639 header->th.th_seq_num = 0x00; 640 header->sw.th_last_seq = ch->th_seq_num; 641 642 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 643 644 kfree(header); 645 646 netif_trans_update(dev); 647 skb_queue_tail(&ch->sweep_queue, sweep_skb); 648 649 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 650 651 return; 652 653 nomem: 654 grp->in_sweep = 0; 655 ctcm_clear_busy(dev); 656 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 657 658 return; 659 } 660 661 /* 662 * MPC mode version of transmit_skb 663 */ 664 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) 665 { 666 struct pdu *p_header; 667 struct net_device *dev = ch->netdev; 668 struct ctcm_priv *priv = dev->ml_priv; 669 struct mpc_group *grp = priv->mpcg; 670 struct th_header *header; 671 struct sk_buff *nskb; 672 int rc = 0; 673 int ccw_idx; 674 unsigned long hi; 675 unsigned long saveflags = 0; /* avoids compiler warning */ 676 677 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", 678 __func__, dev->name, smp_processor_id(), ch, 679 ch->id, fsm_getstate_str(ch->fsm)); 680 681 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { 682 spin_lock_irqsave(&ch->collect_lock, saveflags); 683 refcount_inc(&skb->users); 684 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 685 686 if (!p_header) { 687 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 688 goto nomem_exit; 689 } 690 691 p_header->pdu_offset = skb->len; 692 p_header->pdu_proto = 0x01; 693 p_header->pdu_flag = 0x00; 694 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { 695 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 696 } else { 697 p_header->pdu_flag |= PDU_FIRST; 698 } 699 p_header->pdu_seq = 0; 700 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, 701 PDU_HEADER_LENGTH); 702 703 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" 704 "pdu header and data for up to 32 bytes:\n", 705 __func__, dev->name, skb->len); 706 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 707 708 skb_queue_tail(&ch->collect_queue, skb); 709 ch->collect_len += skb->len; 710 kfree(p_header); 711 712 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 713 goto done; 714 } 715 716 /* 717 * Protect skb against beeing free'd by upper 718 * layers. 719 */ 720 refcount_inc(&skb->users); 721 722 /* 723 * IDAL support in CTCM is broken, so we have to 724 * care about skb's above 2G ourselves. 725 */ 726 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 727 if (hi) { 728 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 729 if (!nskb) { 730 goto nomem_exit; 731 } else { 732 skb_put_data(nskb, skb->data, skb->len); 733 refcount_inc(&nskb->users); 734 refcount_dec(&skb->users); 735 dev_kfree_skb_irq(skb); 736 skb = nskb; 737 } 738 } 739 740 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); 741 742 if (!p_header) 743 goto nomem_exit; 744 745 p_header->pdu_offset = skb->len; 746 p_header->pdu_proto = 0x01; 747 p_header->pdu_flag = 0x00; 748 p_header->pdu_seq = 0; 749 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { 750 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; 751 } else { 752 p_header->pdu_flag |= PDU_FIRST; 753 } 754 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); 755 756 kfree(p_header); 757 758 if (ch->collect_len > 0) { 759 spin_lock_irqsave(&ch->collect_lock, saveflags); 760 skb_queue_tail(&ch->collect_queue, skb); 761 ch->collect_len += skb->len; 762 skb = skb_dequeue(&ch->collect_queue); 763 ch->collect_len -= skb->len; 764 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 765 } 766 767 p_header = (struct pdu *)skb->data; 768 p_header->pdu_flag |= PDU_LAST; 769 770 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 771 772 header = kmalloc(TH_HEADER_LENGTH, gfp_type()); 773 if (!header) 774 goto nomem_exit; 775 776 header->th_seg = 0x00; 777 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 778 header->th_blk_flag = 0x00; 779 header->th_is_xid = 0x00; /* Just data here */ 780 ch->th_seq_num++; 781 header->th_seq_num = ch->th_seq_num; 782 783 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 784 __func__, dev->name, ch->th_seq_num); 785 786 /* put the TH on the packet */ 787 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); 788 789 kfree(header); 790 791 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 792 "up to 32 bytes sent to vtam:\n", 793 __func__, dev->name, skb->len); 794 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 795 796 ch->ccw[4].count = skb->len; 797 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 798 /* 799 * idal allocation failed, try via copying to trans_skb. 800 * trans_skb usually has a pre-allocated idal. 801 */ 802 if (ctcm_checkalloc_buffer(ch)) { 803 /* 804 * Remove our header. 805 * It gets added again on retransmit. 806 */ 807 goto nomem_exit; 808 } 809 810 skb_reset_tail_pointer(ch->trans_skb); 811 ch->trans_skb->len = 0; 812 ch->ccw[1].count = skb->len; 813 skb_put_data(ch->trans_skb, skb->data, skb->len); 814 refcount_dec(&skb->users); 815 dev_kfree_skb_irq(skb); 816 ccw_idx = 0; 817 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 818 "up to 32 bytes sent to vtam:\n", 819 __func__, dev->name, ch->trans_skb->len); 820 CTCM_D3_DUMP((char *)ch->trans_skb->data, 821 min_t(int, 32, ch->trans_skb->len)); 822 } else { 823 skb_queue_tail(&ch->io_queue, skb); 824 ccw_idx = 3; 825 } 826 ch->retry = 0; 827 fsm_newstate(ch->fsm, CTC_STATE_TX); 828 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 829 830 if (do_debug_ccw) 831 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 832 sizeof(struct ccw1) * 3); 833 834 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 835 ch->prof.send_stamp = jiffies; 836 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 837 (unsigned long)ch, 0xff, 0); 838 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 839 if (ccw_idx == 3) 840 ch->prof.doios_single++; 841 if (rc != 0) { 842 fsm_deltimer(&ch->timer); 843 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 844 if (ccw_idx == 3) 845 skb_dequeue_tail(&ch->io_queue); 846 } else if (ccw_idx == 0) { 847 priv->stats.tx_packets++; 848 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 849 } 850 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 851 ctcmpc_send_sweep_req(ch); 852 853 goto done; 854 nomem_exit: 855 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 856 "%s(%s): MEMORY allocation ERROR\n", 857 CTCM_FUNTAIL, ch->id); 858 rc = -ENOMEM; 859 refcount_dec(&skb->users); 860 dev_kfree_skb_any(skb); 861 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 862 done: 863 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 864 return rc; 865 } 866 867 /** 868 * Start transmission of a packet. 869 * Called from generic network device layer. 870 * 871 * skb Pointer to buffer containing the packet. 872 * dev Pointer to interface struct. 873 * 874 * returns 0 if packet consumed, !0 if packet rejected. 875 * Note: If we return !0, then the packet is free'd by 876 * the generic network layer. 877 */ 878 /* first merge version - leaving both functions separated */ 879 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) 880 { 881 struct ctcm_priv *priv = dev->ml_priv; 882 883 if (skb == NULL) { 884 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 885 "%s(%s): NULL sk_buff passed", 886 CTCM_FUNTAIL, dev->name); 887 priv->stats.tx_dropped++; 888 return NETDEV_TX_OK; 889 } 890 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 892 "%s(%s): Got sk_buff with head room < %ld bytes", 893 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 894 dev_kfree_skb(skb); 895 priv->stats.tx_dropped++; 896 return NETDEV_TX_OK; 897 } 898 899 /* 900 * If channels are not running, try to restart them 901 * and throw away packet. 902 */ 903 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 904 fsm_event(priv->fsm, DEV_EVENT_START, dev); 905 dev_kfree_skb(skb); 906 priv->stats.tx_dropped++; 907 priv->stats.tx_errors++; 908 priv->stats.tx_carrier_errors++; 909 return NETDEV_TX_OK; 910 } 911 912 if (ctcm_test_and_set_busy(dev)) 913 return NETDEV_TX_BUSY; 914 915 netif_trans_update(dev); 916 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 917 return NETDEV_TX_BUSY; 918 return NETDEV_TX_OK; 919 } 920 921 /* unmerged MPC variant of ctcm_tx */ 922 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 923 { 924 int len = 0; 925 struct ctcm_priv *priv = dev->ml_priv; 926 struct mpc_group *grp = priv->mpcg; 927 struct sk_buff *newskb = NULL; 928 929 /* 930 * Some sanity checks ... 931 */ 932 if (skb == NULL) { 933 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 934 "%s(%s): NULL sk_buff passed", 935 CTCM_FUNTAIL, dev->name); 936 priv->stats.tx_dropped++; 937 goto done; 938 } 939 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 940 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 941 "%s(%s): Got sk_buff with head room < %ld bytes", 942 CTCM_FUNTAIL, dev->name, 943 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 944 945 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 946 947 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 948 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 949 950 if (!newskb) { 951 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 952 "%s: %s: __dev_alloc_skb failed", 953 __func__, dev->name); 954 955 dev_kfree_skb_any(skb); 956 priv->stats.tx_dropped++; 957 priv->stats.tx_errors++; 958 priv->stats.tx_carrier_errors++; 959 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 960 goto done; 961 } 962 newskb->protocol = skb->protocol; 963 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 964 skb_put_data(newskb, skb->data, skb->len); 965 dev_kfree_skb_any(skb); 966 skb = newskb; 967 } 968 969 /* 970 * If channels are not running, 971 * notify anybody about a link failure and throw 972 * away packet. 973 */ 974 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 975 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 976 dev_kfree_skb_any(skb); 977 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 978 "%s(%s): inactive MPCGROUP - dropped", 979 CTCM_FUNTAIL, dev->name); 980 priv->stats.tx_dropped++; 981 priv->stats.tx_errors++; 982 priv->stats.tx_carrier_errors++; 983 goto done; 984 } 985 986 if (ctcm_test_and_set_busy(dev)) { 987 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 988 "%s(%s): device busy - dropped", 989 CTCM_FUNTAIL, dev->name); 990 dev_kfree_skb_any(skb); 991 priv->stats.tx_dropped++; 992 priv->stats.tx_errors++; 993 priv->stats.tx_carrier_errors++; 994 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 995 goto done; 996 } 997 998 netif_trans_update(dev); 999 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 1000 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1001 "%s(%s): device error - dropped", 1002 CTCM_FUNTAIL, dev->name); 1003 dev_kfree_skb_any(skb); 1004 priv->stats.tx_dropped++; 1005 priv->stats.tx_errors++; 1006 priv->stats.tx_carrier_errors++; 1007 ctcm_clear_busy(dev); 1008 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1009 goto done; 1010 } 1011 ctcm_clear_busy(dev); 1012 done: 1013 if (do_debug) 1014 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1015 1016 return NETDEV_TX_OK; /* handle freeing of skb here */ 1017 } 1018 1019 1020 /** 1021 * Sets MTU of an interface. 1022 * 1023 * dev Pointer to interface struct. 1024 * new_mtu The new MTU to use for this interface. 1025 * 1026 * returns 0 on success, -EINVAL if MTU is out of valid range. 1027 * (valid range is 576 .. 65527). If VM is on the 1028 * remote side, maximum MTU is 32760, however this is 1029 * not checked here. 1030 */ 1031 static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1032 { 1033 struct ctcm_priv *priv; 1034 int max_bufsize; 1035 1036 priv = dev->ml_priv; 1037 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1038 1039 if (IS_MPC(priv)) { 1040 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1041 return -EINVAL; 1042 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1043 } else { 1044 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1045 return -EINVAL; 1046 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1047 } 1048 dev->mtu = new_mtu; 1049 return 0; 1050 } 1051 1052 /** 1053 * Returns interface statistics of a device. 1054 * 1055 * dev Pointer to interface struct. 1056 * 1057 * returns Pointer to stats struct of this interface. 1058 */ 1059 static struct net_device_stats *ctcm_stats(struct net_device *dev) 1060 { 1061 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1062 } 1063 1064 static void ctcm_free_netdevice(struct net_device *dev) 1065 { 1066 struct ctcm_priv *priv; 1067 struct mpc_group *grp; 1068 1069 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1070 "%s(%s)", CTCM_FUNTAIL, dev->name); 1071 priv = dev->ml_priv; 1072 if (priv) { 1073 grp = priv->mpcg; 1074 if (grp) { 1075 if (grp->fsm) 1076 kfree_fsm(grp->fsm); 1077 if (grp->xid_skb) 1078 dev_kfree_skb(grp->xid_skb); 1079 if (grp->rcvd_xid_skb) 1080 dev_kfree_skb(grp->rcvd_xid_skb); 1081 tasklet_kill(&grp->mpc_tasklet2); 1082 kfree(grp); 1083 priv->mpcg = NULL; 1084 } 1085 if (priv->fsm) { 1086 kfree_fsm(priv->fsm); 1087 priv->fsm = NULL; 1088 } 1089 kfree(priv->xid); 1090 priv->xid = NULL; 1091 /* 1092 * Note: kfree(priv); is done in "opposite" function of 1093 * allocator function probe_device which is remove_device. 1094 */ 1095 } 1096 #ifdef MODULE 1097 free_netdev(dev); 1098 #endif 1099 } 1100 1101 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1102 1103 static const struct net_device_ops ctcm_netdev_ops = { 1104 .ndo_open = ctcm_open, 1105 .ndo_stop = ctcm_close, 1106 .ndo_get_stats = ctcm_stats, 1107 .ndo_change_mtu = ctcm_change_mtu, 1108 .ndo_start_xmit = ctcm_tx, 1109 }; 1110 1111 static const struct net_device_ops ctcm_mpc_netdev_ops = { 1112 .ndo_open = ctcm_open, 1113 .ndo_stop = ctcm_close, 1114 .ndo_get_stats = ctcm_stats, 1115 .ndo_change_mtu = ctcm_change_mtu, 1116 .ndo_start_xmit = ctcmpc_tx, 1117 }; 1118 1119 static void ctcm_dev_setup(struct net_device *dev) 1120 { 1121 dev->type = ARPHRD_SLIP; 1122 dev->tx_queue_len = 100; 1123 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1124 dev->min_mtu = 576; 1125 dev->max_mtu = 65527; 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 = kcalloc(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 result = -ENODEV; 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 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1614 1615 dev_info(&dev->dev, 1616 "setup OK : r/w = %s/%s, protocol : %d\n", 1617 priv->channel[CTCM_READ]->id, 1618 priv->channel[CTCM_WRITE]->id, priv->protocol); 1619 1620 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1621 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1622 priv->channel[CTCM_READ]->id, 1623 priv->channel[CTCM_WRITE]->id, priv->protocol); 1624 1625 return 0; 1626 out_dev: 1627 ctcm_free_netdevice(dev); 1628 out_ccw2: 1629 ccw_device_set_offline(cgdev->cdev[1]); 1630 out_ccw1: 1631 ccw_device_set_offline(cgdev->cdev[0]); 1632 out_remove_channel2: 1633 readc = channel_get(type, read_id, CTCM_READ); 1634 channel_remove(readc); 1635 out_remove_channel1: 1636 writec = channel_get(type, write_id, CTCM_WRITE); 1637 channel_remove(writec); 1638 out_err_result: 1639 return result; 1640 } 1641 1642 /** 1643 * Shutdown an interface. 1644 * 1645 * cgdev Device to be shut down. 1646 * 1647 * returns 0 on success, !0 on failure. 1648 */ 1649 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1650 { 1651 struct ctcm_priv *priv; 1652 struct net_device *dev; 1653 1654 priv = dev_get_drvdata(&cgdev->dev); 1655 if (!priv) 1656 return -ENODEV; 1657 1658 if (priv->channel[CTCM_READ]) { 1659 dev = priv->channel[CTCM_READ]->netdev; 1660 CTCM_DBF_DEV(SETUP, dev, ""); 1661 /* Close the device */ 1662 ctcm_close(dev); 1663 dev->flags &= ~IFF_RUNNING; 1664 channel_free(priv->channel[CTCM_READ]); 1665 } else 1666 dev = NULL; 1667 1668 if (priv->channel[CTCM_WRITE]) 1669 channel_free(priv->channel[CTCM_WRITE]); 1670 1671 if (dev) { 1672 unregister_netdev(dev); 1673 ctcm_free_netdevice(dev); 1674 } 1675 1676 if (priv->fsm) 1677 kfree_fsm(priv->fsm); 1678 1679 ccw_device_set_offline(cgdev->cdev[1]); 1680 ccw_device_set_offline(cgdev->cdev[0]); 1681 channel_remove(priv->channel[CTCM_READ]); 1682 channel_remove(priv->channel[CTCM_WRITE]); 1683 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1684 1685 return 0; 1686 1687 } 1688 1689 1690 static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1691 { 1692 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1693 1694 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1695 "removing device %p, proto : %d", 1696 cgdev, priv->protocol); 1697 1698 if (cgdev->state == CCWGROUP_ONLINE) 1699 ctcm_shutdown_device(cgdev); 1700 dev_set_drvdata(&cgdev->dev, NULL); 1701 kfree(priv); 1702 put_device(&cgdev->dev); 1703 } 1704 1705 static int ctcm_pm_suspend(struct ccwgroup_device *gdev) 1706 { 1707 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1708 1709 if (gdev->state == CCWGROUP_OFFLINE) 1710 return 0; 1711 netif_device_detach(priv->channel[CTCM_READ]->netdev); 1712 ctcm_close(priv->channel[CTCM_READ]->netdev); 1713 if (!wait_event_timeout(priv->fsm->wait_q, 1714 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) { 1715 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1716 return -EBUSY; 1717 } 1718 ccw_device_set_offline(gdev->cdev[1]); 1719 ccw_device_set_offline(gdev->cdev[0]); 1720 return 0; 1721 } 1722 1723 static int ctcm_pm_resume(struct ccwgroup_device *gdev) 1724 { 1725 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); 1726 int rc; 1727 1728 if (gdev->state == CCWGROUP_OFFLINE) 1729 return 0; 1730 rc = ccw_device_set_online(gdev->cdev[1]); 1731 if (rc) 1732 goto err_out; 1733 rc = ccw_device_set_online(gdev->cdev[0]); 1734 if (rc) 1735 goto err_out; 1736 ctcm_open(priv->channel[CTCM_READ]->netdev); 1737 err_out: 1738 netif_device_attach(priv->channel[CTCM_READ]->netdev); 1739 return rc; 1740 } 1741 1742 static struct ccw_device_id ctcm_ids[] = { 1743 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1744 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1745 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1746 {}, 1747 }; 1748 MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1749 1750 static struct ccw_driver ctcm_ccw_driver = { 1751 .driver = { 1752 .owner = THIS_MODULE, 1753 .name = "ctcm", 1754 }, 1755 .ids = ctcm_ids, 1756 .probe = ccwgroup_probe_ccwdev, 1757 .remove = ccwgroup_remove_ccwdev, 1758 .int_class = IRQIO_CTC, 1759 }; 1760 1761 static struct ccwgroup_driver ctcm_group_driver = { 1762 .driver = { 1763 .owner = THIS_MODULE, 1764 .name = CTC_DRIVER_NAME, 1765 }, 1766 .ccw_driver = &ctcm_ccw_driver, 1767 .setup = ctcm_probe_device, 1768 .remove = ctcm_remove_device, 1769 .set_online = ctcm_new_device, 1770 .set_offline = ctcm_shutdown_device, 1771 .freeze = ctcm_pm_suspend, 1772 .thaw = ctcm_pm_resume, 1773 .restore = ctcm_pm_resume, 1774 }; 1775 1776 static ssize_t group_store(struct device_driver *ddrv, const char *buf, 1777 size_t count) 1778 { 1779 int err; 1780 1781 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf); 1782 return err ? err : count; 1783 } 1784 static DRIVER_ATTR_WO(group); 1785 1786 static struct attribute *ctcm_drv_attrs[] = { 1787 &driver_attr_group.attr, 1788 NULL, 1789 }; 1790 static struct attribute_group ctcm_drv_attr_group = { 1791 .attrs = ctcm_drv_attrs, 1792 }; 1793 static const struct attribute_group *ctcm_drv_attr_groups[] = { 1794 &ctcm_drv_attr_group, 1795 NULL, 1796 }; 1797 1798 /* 1799 * Module related routines 1800 */ 1801 1802 /* 1803 * Prepare to be unloaded. Free IRQ's and release all resources. 1804 * This is called just before this module is unloaded. It is 1805 * not called, if the usage count is !0, so we don't need to check 1806 * for that. 1807 */ 1808 static void __exit ctcm_exit(void) 1809 { 1810 ccwgroup_driver_unregister(&ctcm_group_driver); 1811 ccw_driver_unregister(&ctcm_ccw_driver); 1812 root_device_unregister(ctcm_root_dev); 1813 ctcm_unregister_dbf_views(); 1814 pr_info("CTCM driver unloaded\n"); 1815 } 1816 1817 /* 1818 * Print Banner. 1819 */ 1820 static void print_banner(void) 1821 { 1822 pr_info("CTCM driver initialized\n"); 1823 } 1824 1825 /** 1826 * Initialize module. 1827 * This is called just after the module is loaded. 1828 * 1829 * returns 0 on success, !0 on error. 1830 */ 1831 static int __init ctcm_init(void) 1832 { 1833 int ret; 1834 1835 channels = NULL; 1836 1837 ret = ctcm_register_dbf_views(); 1838 if (ret) 1839 goto out_err; 1840 ctcm_root_dev = root_device_register("ctcm"); 1841 ret = PTR_ERR_OR_ZERO(ctcm_root_dev); 1842 if (ret) 1843 goto register_err; 1844 ret = ccw_driver_register(&ctcm_ccw_driver); 1845 if (ret) 1846 goto ccw_err; 1847 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups; 1848 ret = ccwgroup_driver_register(&ctcm_group_driver); 1849 if (ret) 1850 goto ccwgroup_err; 1851 print_banner(); 1852 return 0; 1853 1854 ccwgroup_err: 1855 ccw_driver_unregister(&ctcm_ccw_driver); 1856 ccw_err: 1857 root_device_unregister(ctcm_root_dev); 1858 register_err: 1859 ctcm_unregister_dbf_views(); 1860 out_err: 1861 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1862 __func__, ret); 1863 return ret; 1864 } 1865 1866 module_init(ctcm_init); 1867 module_exit(ctcm_exit); 1868 1869 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1870 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1871 MODULE_LICENSE("GPL"); 1872 1873