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 */ 61static struct device *ctcm_root_dev; 62 63/* 64 * Linked list of all detected channels. 65 */ 66struct 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 */ 75void 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 */ 188static 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 */ 200static 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 */ 252static 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 277static 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 */ 309static 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 382int 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 */ 425int 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 */ 443int 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 */ 465static 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], 0, 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 } 592done: 593 ctcm_clear_busy(ch->netdev); 594 return rc; 595} 596 597static 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 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 642 643 kfree(header); 644 645 netif_trans_update(dev); 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 652nomem: 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 */ 663static 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 refcount_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 (be16_to_cpu(skb->protocol) == 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 refcount_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 skb_put_data(nskb, skb->data, skb->len); 732 refcount_inc(&nskb->users); 733 refcount_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 (be16_to_cpu(skb->protocol) == 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 skb_put_data(ch->trans_skb, skb->data, skb->len); 813 refcount_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], 0, 0xff, 0); 836 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 837 if (ccw_idx == 3) 838 ch->prof.doios_single++; 839 if (rc != 0) { 840 fsm_deltimer(&ch->timer); 841 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 842 if (ccw_idx == 3) 843 skb_dequeue_tail(&ch->io_queue); 844 } else if (ccw_idx == 0) { 845 priv->stats.tx_packets++; 846 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 847 } 848 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 849 ctcmpc_send_sweep_req(ch); 850 851 goto done; 852nomem_exit: 853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 854 "%s(%s): MEMORY allocation ERROR\n", 855 CTCM_FUNTAIL, ch->id); 856 rc = -ENOMEM; 857 refcount_dec(&skb->users); 858 dev_kfree_skb_any(skb); 859 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 860done: 861 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 862 return rc; 863} 864 865/** 866 * Start transmission of a packet. 867 * Called from generic network device layer. 868 */ 869/* first merge version - leaving both functions separated */ 870static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev) 871{ 872 struct ctcm_priv *priv = dev->ml_priv; 873 874 if (skb == NULL) { 875 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 876 "%s(%s): NULL sk_buff passed", 877 CTCM_FUNTAIL, dev->name); 878 priv->stats.tx_dropped++; 879 return NETDEV_TX_OK; 880 } 881 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 882 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 883 "%s(%s): Got sk_buff with head room < %ld bytes", 884 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 885 dev_kfree_skb(skb); 886 priv->stats.tx_dropped++; 887 return NETDEV_TX_OK; 888 } 889 890 /* 891 * If channels are not running, try to restart them 892 * and throw away packet. 893 */ 894 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 895 fsm_event(priv->fsm, DEV_EVENT_START, dev); 896 dev_kfree_skb(skb); 897 priv->stats.tx_dropped++; 898 priv->stats.tx_errors++; 899 priv->stats.tx_carrier_errors++; 900 return NETDEV_TX_OK; 901 } 902 903 if (ctcm_test_and_set_busy(dev)) 904 return NETDEV_TX_BUSY; 905 906 netif_trans_update(dev); 907 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 908 return NETDEV_TX_BUSY; 909 return NETDEV_TX_OK; 910} 911 912/* unmerged MPC variant of ctcm_tx */ 913static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 914{ 915 int len = 0; 916 struct ctcm_priv *priv = dev->ml_priv; 917 struct mpc_group *grp = priv->mpcg; 918 struct sk_buff *newskb = NULL; 919 920 /* 921 * Some sanity checks ... 922 */ 923 if (skb == NULL) { 924 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 925 "%s(%s): NULL sk_buff passed", 926 CTCM_FUNTAIL, dev->name); 927 priv->stats.tx_dropped++; 928 goto done; 929 } 930 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 931 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 932 "%s(%s): Got sk_buff with head room < %ld bytes", 933 CTCM_FUNTAIL, dev->name, 934 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 935 936 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 937 938 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 939 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); 940 941 if (!newskb) { 942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 943 "%s: %s: __dev_alloc_skb failed", 944 __func__, dev->name); 945 946 dev_kfree_skb_any(skb); 947 priv->stats.tx_dropped++; 948 priv->stats.tx_errors++; 949 priv->stats.tx_carrier_errors++; 950 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 951 goto done; 952 } 953 newskb->protocol = skb->protocol; 954 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 955 skb_put_data(newskb, skb->data, skb->len); 956 dev_kfree_skb_any(skb); 957 skb = newskb; 958 } 959 960 /* 961 * If channels are not running, 962 * notify anybody about a link failure and throw 963 * away packet. 964 */ 965 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 966 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 967 dev_kfree_skb_any(skb); 968 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 969 "%s(%s): inactive MPCGROUP - dropped", 970 CTCM_FUNTAIL, dev->name); 971 priv->stats.tx_dropped++; 972 priv->stats.tx_errors++; 973 priv->stats.tx_carrier_errors++; 974 goto done; 975 } 976 977 if (ctcm_test_and_set_busy(dev)) { 978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 979 "%s(%s): device busy - dropped", 980 CTCM_FUNTAIL, dev->name); 981 dev_kfree_skb_any(skb); 982 priv->stats.tx_dropped++; 983 priv->stats.tx_errors++; 984 priv->stats.tx_carrier_errors++; 985 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 986 goto done; 987 } 988 989 netif_trans_update(dev); 990 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 991 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 992 "%s(%s): device error - dropped", 993 CTCM_FUNTAIL, dev->name); 994 dev_kfree_skb_any(skb); 995 priv->stats.tx_dropped++; 996 priv->stats.tx_errors++; 997 priv->stats.tx_carrier_errors++; 998 ctcm_clear_busy(dev); 999 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1000 goto done; 1001 } 1002 ctcm_clear_busy(dev); 1003done: 1004 if (do_debug) 1005 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 1006 1007 return NETDEV_TX_OK; /* handle freeing of skb here */ 1008} 1009 1010 1011/** 1012 * Sets MTU of an interface. 1013 * 1014 * dev Pointer to interface struct. 1015 * new_mtu The new MTU to use for this interface. 1016 * 1017 * returns 0 on success, -EINVAL if MTU is out of valid range. 1018 * (valid range is 576 .. 65527). If VM is on the 1019 * remote side, maximum MTU is 32760, however this is 1020 * not checked here. 1021 */ 1022static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 1023{ 1024 struct ctcm_priv *priv; 1025 int max_bufsize; 1026 1027 priv = dev->ml_priv; 1028 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 1029 1030 if (IS_MPC(priv)) { 1031 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 1032 return -EINVAL; 1033 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1034 } else { 1035 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 1036 return -EINVAL; 1037 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1038 } 1039 dev->mtu = new_mtu; 1040 return 0; 1041} 1042 1043/** 1044 * Returns interface statistics of a device. 1045 * 1046 * dev Pointer to interface struct. 1047 * 1048 * returns Pointer to stats struct of this interface. 1049 */ 1050static struct net_device_stats *ctcm_stats(struct net_device *dev) 1051{ 1052 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1053} 1054 1055static void ctcm_free_netdevice(struct net_device *dev) 1056{ 1057 struct ctcm_priv *priv; 1058 struct mpc_group *grp; 1059 1060 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1061 "%s(%s)", CTCM_FUNTAIL, dev->name); 1062 priv = dev->ml_priv; 1063 if (priv) { 1064 grp = priv->mpcg; 1065 if (grp) { 1066 if (grp->fsm) 1067 kfree_fsm(grp->fsm); 1068 dev_kfree_skb(grp->xid_skb); 1069 dev_kfree_skb(grp->rcvd_xid_skb); 1070 tasklet_kill(&grp->mpc_tasklet2); 1071 kfree(grp); 1072 priv->mpcg = NULL; 1073 } 1074 if (priv->fsm) { 1075 kfree_fsm(priv->fsm); 1076 priv->fsm = NULL; 1077 } 1078 kfree(priv->xid); 1079 priv->xid = NULL; 1080 /* 1081 * Note: kfree(priv); is done in "opposite" function of 1082 * allocator function probe_device which is remove_device. 1083 */ 1084 } 1085#ifdef MODULE 1086 free_netdev(dev); 1087#endif 1088} 1089 1090struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1091 1092static const struct net_device_ops ctcm_netdev_ops = { 1093 .ndo_open = ctcm_open, 1094 .ndo_stop = ctcm_close, 1095 .ndo_get_stats = ctcm_stats, 1096 .ndo_change_mtu = ctcm_change_mtu, 1097 .ndo_start_xmit = ctcm_tx, 1098}; 1099 1100static const struct net_device_ops ctcm_mpc_netdev_ops = { 1101 .ndo_open = ctcm_open, 1102 .ndo_stop = ctcm_close, 1103 .ndo_get_stats = ctcm_stats, 1104 .ndo_change_mtu = ctcm_change_mtu, 1105 .ndo_start_xmit = ctcmpc_tx, 1106}; 1107 1108static void ctcm_dev_setup(struct net_device *dev) 1109{ 1110 dev->type = ARPHRD_SLIP; 1111 dev->tx_queue_len = 100; 1112 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1113 dev->min_mtu = 576; 1114 dev->max_mtu = 65527; 1115} 1116 1117/* 1118 * Initialize everything of the net device except the name and the 1119 * channel structs. 1120 */ 1121static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1122{ 1123 struct net_device *dev; 1124 struct mpc_group *grp; 1125 if (!priv) 1126 return NULL; 1127 1128 if (IS_MPC(priv)) 1129 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN, 1130 ctcm_dev_setup); 1131 else 1132 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN, 1133 ctcm_dev_setup); 1134 1135 if (!dev) { 1136 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1137 "%s: MEMORY allocation ERROR", 1138 CTCM_FUNTAIL); 1139 return NULL; 1140 } 1141 dev->ml_priv = priv; 1142 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1143 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1144 dev_fsm, dev_fsm_len, GFP_KERNEL); 1145 if (priv->fsm == NULL) { 1146 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1147 free_netdev(dev); 1148 return NULL; 1149 } 1150 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1151 fsm_settimer(priv->fsm, &priv->restart_timer); 1152 1153 if (IS_MPC(priv)) { 1154 /* MPC Group Initializations */ 1155 grp = ctcmpc_init_mpc_group(priv); 1156 if (grp == NULL) { 1157 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1158 free_netdev(dev); 1159 return NULL; 1160 } 1161 tasklet_init(&grp->mpc_tasklet2, 1162 mpc_group_ready, (unsigned long)dev); 1163 dev->mtu = MPC_BUFSIZE_DEFAULT - 1164 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1165 1166 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1167 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1168 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1169 } else { 1170 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1171 dev->netdev_ops = &ctcm_netdev_ops; 1172 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1173 } 1174 1175 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1176 1177 return dev; 1178} 1179 1180/** 1181 * Main IRQ handler. 1182 * 1183 * cdev The ccw_device the interrupt is for. 1184 * intparm interruption parameter. 1185 * irb interruption response block. 1186 */ 1187static void ctcm_irq_handler(struct ccw_device *cdev, 1188 unsigned long intparm, struct irb *irb) 1189{ 1190 struct channel *ch; 1191 struct net_device *dev; 1192 struct ctcm_priv *priv; 1193 struct ccwgroup_device *cgdev; 1194 int cstat; 1195 int dstat; 1196 1197 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1198 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); 1199 1200 if (ctcm_check_irb_error(cdev, irb)) 1201 return; 1202 1203 cgdev = dev_get_drvdata(&cdev->dev); 1204 1205 cstat = irb->scsw.cmd.cstat; 1206 dstat = irb->scsw.cmd.dstat; 1207 1208 /* Check for unsolicited interrupts. */ 1209 if (cgdev == NULL) { 1210 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, 1211 "%s(%s) unsolicited irq: c-%02x d-%02x\n", 1212 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); 1213 dev_warn(&cdev->dev, 1214 "The adapter received a non-specific IRQ\n"); 1215 return; 1216 } 1217 1218 priv = dev_get_drvdata(&cgdev->dev); 1219 1220 /* Try to extract channel from driver data. */ 1221 if (priv->channel[CTCM_READ]->cdev == cdev) 1222 ch = priv->channel[CTCM_READ]; 1223 else if (priv->channel[CTCM_WRITE]->cdev == cdev) 1224 ch = priv->channel[CTCM_WRITE]; 1225 else { 1226 dev_err(&cdev->dev, 1227 "%s: Internal error: Can't determine channel for " 1228 "interrupt device %s\n", 1229 __func__, dev_name(&cdev->dev)); 1230 /* Explain: inconsistent internal structures */ 1231 return; 1232 } 1233 1234 dev = ch->netdev; 1235 if (dev == NULL) { 1236 dev_err(&cdev->dev, 1237 "%s Internal error: net_device is NULL, ch = 0x%p\n", 1238 __func__, ch); 1239 /* Explain: inconsistent internal structures */ 1240 return; 1241 } 1242 1243 /* Copy interruption response block. */ 1244 memcpy(ch->irb, irb, sizeof(struct irb)); 1245 1246 /* Issue error message and return on subchannel error code */ 1247 if (irb->scsw.cmd.cstat) { 1248 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); 1249 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1250 "%s(%s): sub-ch check %s: cs=%02x ds=%02x", 1251 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); 1252 dev_warn(&cdev->dev, 1253 "A check occurred on the subchannel\n"); 1254 return; 1255 } 1256 1257 /* Check the reason-code of a unit check */ 1258 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 1259 if ((irb->ecw[0] & ch->sense_rc) == 0) 1260 /* print it only once */ 1261 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1262 "%s(%s): sense=%02x, ds=%02x", 1263 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); 1264 ccw_unit_check(ch, irb->ecw[0]); 1265 return; 1266 } 1267 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { 1268 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) 1269 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); 1270 else 1271 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); 1272 return; 1273 } 1274 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 1275 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); 1276 return; 1277 } 1278 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || 1279 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || 1280 (irb->scsw.cmd.stctl == 1281 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) 1282 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); 1283 else 1284 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); 1285 1286} 1287 1288static const struct device_type ctcm_devtype = { 1289 .name = "ctcm", 1290 .groups = ctcm_attr_groups, 1291}; 1292 1293/** 1294 * Add ctcm specific attributes. 1295 * Add ctcm private data. 1296 * 1297 * cgdev pointer to ccwgroup_device just added 1298 * 1299 * returns 0 on success, !0 on failure. 1300 */ 1301static int ctcm_probe_device(struct ccwgroup_device *cgdev) 1302{ 1303 struct ctcm_priv *priv; 1304 1305 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1306 "%s %p", 1307 __func__, cgdev); 1308 1309 if (!get_device(&cgdev->dev)) 1310 return -ENODEV; 1311 1312 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); 1313 if (!priv) { 1314 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1315 "%s: memory allocation failure", 1316 CTCM_FUNTAIL); 1317 put_device(&cgdev->dev); 1318 return -ENOMEM; 1319 } 1320 priv->buffer_size = CTCM_BUFSIZE_DEFAULT; 1321 cgdev->cdev[0]->handler = ctcm_irq_handler; 1322 cgdev->cdev[1]->handler = ctcm_irq_handler; 1323 dev_set_drvdata(&cgdev->dev, priv); 1324 cgdev->dev.type = &ctcm_devtype; 1325 1326 return 0; 1327} 1328 1329/** 1330 * Add a new channel to the list of channels. 1331 * Keeps the channel list sorted. 1332 * 1333 * cdev The ccw_device to be added. 1334 * type The type class of the new channel. 1335 * priv Points to the private data of the ccwgroup_device. 1336 * 1337 * returns 0 on success, !0 on error. 1338 */ 1339static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, 1340 struct ctcm_priv *priv) 1341{ 1342 struct channel **c = &channels; 1343 struct channel *ch; 1344 int ccw_num; 1345 int rc = 0; 1346 1347 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1348 "%s(%s), type %d, proto %d", 1349 __func__, dev_name(&cdev->dev), type, priv->protocol); 1350 1351 ch = kzalloc(sizeof(struct channel), GFP_KERNEL); 1352 if (ch == NULL) 1353 return -ENOMEM; 1354 1355 ch->protocol = priv->protocol; 1356 if (IS_MPC(priv)) { 1357 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1358 if (ch->discontact_th == NULL) 1359 goto nomem_return; 1360 1361 ch->discontact_th->th_blk_flag = TH_DISCONTACT; 1362 tasklet_init(&ch->ch_disc_tasklet, 1363 mpc_action_send_discontact, (unsigned long)ch); 1364 1365 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); 1366 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); 1367 ccw_num = 17; 1368 } else 1369 ccw_num = 8; 1370 1371 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); 1372 if (ch->ccw == NULL) 1373 goto nomem_return; 1374 1375 ch->cdev = cdev; 1376 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); 1377 ch->type = type; 1378 1379 /** 1380 * "static" ccws are used in the following way: 1381 * 1382 * ccw[0..2] (Channel program for generic I/O): 1383 * 0: prepare 1384 * 1: read or write (depending on direction) with fixed 1385 * buffer (idal allocated once when buffer is allocated) 1386 * 2: nop 1387 * ccw[3..5] (Channel program for direct write of packets) 1388 * 3: prepare 1389 * 4: write (idal allocated on every write). 1390 * 5: nop 1391 * ccw[6..7] (Channel program for initial channel setup): 1392 * 6: set extended mode 1393 * 7: nop 1394 * 1395 * ch->ccw[0..5] are initialized in ch_action_start because 1396 * the channel's direction is yet unknown here. 1397 * 1398 * ccws used for xid2 negotiations 1399 * ch-ccw[8-14] need to be used for the XID exchange either 1400 * X side XID2 Processing 1401 * 8: write control 1402 * 9: write th 1403 * 10: write XID 1404 * 11: read th from secondary 1405 * 12: read XID from secondary 1406 * 13: read 4 byte ID 1407 * 14: nop 1408 * Y side XID Processing 1409 * 8: sense 1410 * 9: read th 1411 * 10: read XID 1412 * 11: write th 1413 * 12: write XID 1414 * 13: write 4 byte ID 1415 * 14: nop 1416 * 1417 * ccws used for double noop due to VM timing issues 1418 * which result in unrecoverable Busy on channel 1419 * 15: nop 1420 * 16: nop 1421 */ 1422 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; 1423 ch->ccw[6].flags = CCW_FLAG_SLI; 1424 1425 ch->ccw[7].cmd_code = CCW_CMD_NOOP; 1426 ch->ccw[7].flags = CCW_FLAG_SLI; 1427 1428 if (IS_MPC(priv)) { 1429 ch->ccw[15].cmd_code = CCW_CMD_WRITE; 1430 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1431 ch->ccw[15].count = TH_HEADER_LENGTH; 1432 ch->ccw[15].cda = virt_to_phys(ch->discontact_th); 1433 1434 ch->ccw[16].cmd_code = CCW_CMD_NOOP; 1435 ch->ccw[16].flags = CCW_FLAG_SLI; 1436 1437 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1438 ctc_ch_event_names, CTC_MPC_NR_STATES, 1439 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, 1440 mpc_ch_fsm_len, GFP_KERNEL); 1441 } else { 1442 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1443 ctc_ch_event_names, CTC_NR_STATES, 1444 CTC_NR_EVENTS, ch_fsm, 1445 ch_fsm_len, GFP_KERNEL); 1446 } 1447 if (ch->fsm == NULL) 1448 goto nomem_return; 1449 1450 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 1451 1452 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); 1453 if (ch->irb == NULL) 1454 goto nomem_return; 1455 1456 while (*c && ctcm_less_than((*c)->id, ch->id)) 1457 c = &(*c)->next; 1458 1459 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { 1460 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1461 "%s (%s) already in list, using old entry", 1462 __func__, (*c)->id); 1463 1464 goto free_return; 1465 } 1466 1467 spin_lock_init(&ch->collect_lock); 1468 1469 fsm_settimer(ch->fsm, &ch->timer); 1470 skb_queue_head_init(&ch->io_queue); 1471 skb_queue_head_init(&ch->collect_queue); 1472 1473 if (IS_MPC(priv)) { 1474 fsm_settimer(ch->fsm, &ch->sweep_timer); 1475 skb_queue_head_init(&ch->sweep_queue); 1476 } 1477 ch->next = *c; 1478 *c = ch; 1479 return 0; 1480 1481nomem_return: 1482 rc = -ENOMEM; 1483 1484free_return: /* note that all channel pointers are 0 or valid */ 1485 kfree(ch->ccw); 1486 kfree(ch->discontact_th); 1487 kfree_fsm(ch->fsm); 1488 kfree(ch->irb); 1489 kfree(ch); 1490 return rc; 1491} 1492 1493/* 1494 * Return type of a detected device. 1495 */ 1496static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) 1497{ 1498 enum ctcm_channel_types type; 1499 type = (enum ctcm_channel_types)id->driver_info; 1500 1501 if (type == ctcm_channel_type_ficon) 1502 type = ctcm_channel_type_escon; 1503 1504 return type; 1505} 1506 1507/** 1508 * 1509 * Setup an interface. 1510 * 1511 * cgdev Device to be setup. 1512 * 1513 * returns 0 on success, !0 on failure. 1514 */ 1515static int ctcm_new_device(struct ccwgroup_device *cgdev) 1516{ 1517 char read_id[CTCM_ID_SIZE]; 1518 char write_id[CTCM_ID_SIZE]; 1519 int direction; 1520 enum ctcm_channel_types type; 1521 struct ctcm_priv *priv; 1522 struct net_device *dev; 1523 struct ccw_device *cdev0; 1524 struct ccw_device *cdev1; 1525 struct channel *readc; 1526 struct channel *writec; 1527 int ret; 1528 int result; 1529 1530 priv = dev_get_drvdata(&cgdev->dev); 1531 if (!priv) { 1532 result = -ENODEV; 1533 goto out_err_result; 1534 } 1535 1536 cdev0 = cgdev->cdev[0]; 1537 cdev1 = cgdev->cdev[1]; 1538 1539 type = get_channel_type(&cdev0->id); 1540 1541 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); 1542 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); 1543 1544 ret = add_channel(cdev0, type, priv); 1545 if (ret) { 1546 result = ret; 1547 goto out_err_result; 1548 } 1549 ret = add_channel(cdev1, type, priv); 1550 if (ret) { 1551 result = ret; 1552 goto out_remove_channel1; 1553 } 1554 1555 ret = ccw_device_set_online(cdev0); 1556 if (ret != 0) { 1557 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1558 "%s(%s) set_online rc=%d", 1559 CTCM_FUNTAIL, read_id, ret); 1560 result = -EIO; 1561 goto out_remove_channel2; 1562 } 1563 1564 ret = ccw_device_set_online(cdev1); 1565 if (ret != 0) { 1566 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1567 "%s(%s) set_online rc=%d", 1568 CTCM_FUNTAIL, write_id, ret); 1569 1570 result = -EIO; 1571 goto out_ccw1; 1572 } 1573 1574 dev = ctcm_init_netdevice(priv); 1575 if (dev == NULL) { 1576 result = -ENODEV; 1577 goto out_ccw2; 1578 } 1579 1580 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1581 priv->channel[direction] = 1582 channel_get(type, direction == CTCM_READ ? 1583 read_id : write_id, direction); 1584 if (priv->channel[direction] == NULL) { 1585 if (direction == CTCM_WRITE) 1586 channel_free(priv->channel[CTCM_READ]); 1587 result = -ENODEV; 1588 goto out_dev; 1589 } 1590 priv->channel[direction]->netdev = dev; 1591 priv->channel[direction]->protocol = priv->protocol; 1592 priv->channel[direction]->max_bufsize = priv->buffer_size; 1593 } 1594 /* sysfs magic */ 1595 SET_NETDEV_DEV(dev, &cgdev->dev); 1596 1597 if (register_netdev(dev)) { 1598 result = -ENODEV; 1599 goto out_dev; 1600 } 1601 1602 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1603 1604 dev_info(&dev->dev, 1605 "setup OK : r/w = %s/%s, protocol : %d\n", 1606 priv->channel[CTCM_READ]->id, 1607 priv->channel[CTCM_WRITE]->id, priv->protocol); 1608 1609 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1610 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1611 priv->channel[CTCM_READ]->id, 1612 priv->channel[CTCM_WRITE]->id, priv->protocol); 1613 1614 return 0; 1615out_dev: 1616 ctcm_free_netdevice(dev); 1617out_ccw2: 1618 ccw_device_set_offline(cgdev->cdev[1]); 1619out_ccw1: 1620 ccw_device_set_offline(cgdev->cdev[0]); 1621out_remove_channel2: 1622 readc = channel_get(type, read_id, CTCM_READ); 1623 channel_remove(readc); 1624out_remove_channel1: 1625 writec = channel_get(type, write_id, CTCM_WRITE); 1626 channel_remove(writec); 1627out_err_result: 1628 return result; 1629} 1630 1631/** 1632 * Shutdown an interface. 1633 * 1634 * cgdev Device to be shut down. 1635 * 1636 * returns 0 on success, !0 on failure. 1637 */ 1638static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1639{ 1640 struct ctcm_priv *priv; 1641 struct net_device *dev; 1642 1643 priv = dev_get_drvdata(&cgdev->dev); 1644 if (!priv) 1645 return -ENODEV; 1646 1647 if (priv->channel[CTCM_READ]) { 1648 dev = priv->channel[CTCM_READ]->netdev; 1649 CTCM_DBF_DEV(SETUP, dev, ""); 1650 /* Close the device */ 1651 ctcm_close(dev); 1652 dev->flags &= ~IFF_RUNNING; 1653 channel_free(priv->channel[CTCM_READ]); 1654 } else 1655 dev = NULL; 1656 1657 if (priv->channel[CTCM_WRITE]) 1658 channel_free(priv->channel[CTCM_WRITE]); 1659 1660 if (dev) { 1661 unregister_netdev(dev); 1662 ctcm_free_netdevice(dev); 1663 } 1664 1665 if (priv->fsm) 1666 kfree_fsm(priv->fsm); 1667 1668 ccw_device_set_offline(cgdev->cdev[1]); 1669 ccw_device_set_offline(cgdev->cdev[0]); 1670 channel_remove(priv->channel[CTCM_READ]); 1671 channel_remove(priv->channel[CTCM_WRITE]); 1672 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1673 1674 return 0; 1675 1676} 1677 1678 1679static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1680{ 1681 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1682 1683 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1684 "removing device %p, proto : %d", 1685 cgdev, priv->protocol); 1686 1687 if (cgdev->state == CCWGROUP_ONLINE) 1688 ctcm_shutdown_device(cgdev); 1689 dev_set_drvdata(&cgdev->dev, NULL); 1690 kfree(priv); 1691 put_device(&cgdev->dev); 1692} 1693 1694static struct ccw_device_id ctcm_ids[] = { 1695 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1696 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1697 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1698 {}, 1699}; 1700MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1701 1702static struct ccw_driver ctcm_ccw_driver = { 1703 .driver = { 1704 .owner = THIS_MODULE, 1705 .name = "ctcm", 1706 }, 1707 .ids = ctcm_ids, 1708 .probe = ccwgroup_probe_ccwdev, 1709 .remove = ccwgroup_remove_ccwdev, 1710 .int_class = IRQIO_CTC, 1711}; 1712 1713static struct ccwgroup_driver ctcm_group_driver = { 1714 .driver = { 1715 .owner = THIS_MODULE, 1716 .name = CTC_DRIVER_NAME, 1717 }, 1718 .ccw_driver = &ctcm_ccw_driver, 1719 .setup = ctcm_probe_device, 1720 .remove = ctcm_remove_device, 1721 .set_online = ctcm_new_device, 1722 .set_offline = ctcm_shutdown_device, 1723}; 1724 1725static ssize_t group_store(struct device_driver *ddrv, const char *buf, 1726 size_t count) 1727{ 1728 int err; 1729 1730 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf); 1731 return err ? err : count; 1732} 1733static DRIVER_ATTR_WO(group); 1734 1735static struct attribute *ctcm_drv_attrs[] = { 1736 &driver_attr_group.attr, 1737 NULL, 1738}; 1739static struct attribute_group ctcm_drv_attr_group = { 1740 .attrs = ctcm_drv_attrs, 1741}; 1742static const struct attribute_group *ctcm_drv_attr_groups[] = { 1743 &ctcm_drv_attr_group, 1744 NULL, 1745}; 1746 1747/* 1748 * Module related routines 1749 */ 1750 1751/* 1752 * Prepare to be unloaded. Free IRQ's and release all resources. 1753 * This is called just before this module is unloaded. It is 1754 * not called, if the usage count is !0, so we don't need to check 1755 * for that. 1756 */ 1757static void __exit ctcm_exit(void) 1758{ 1759 ccwgroup_driver_unregister(&ctcm_group_driver); 1760 ccw_driver_unregister(&ctcm_ccw_driver); 1761 root_device_unregister(ctcm_root_dev); 1762 ctcm_unregister_dbf_views(); 1763 pr_info("CTCM driver unloaded\n"); 1764} 1765 1766/* 1767 * Print Banner. 1768 */ 1769static void print_banner(void) 1770{ 1771 pr_info("CTCM driver initialized\n"); 1772} 1773 1774/** 1775 * Initialize module. 1776 * This is called just after the module is loaded. 1777 * 1778 * returns 0 on success, !0 on error. 1779 */ 1780static int __init ctcm_init(void) 1781{ 1782 int ret; 1783 1784 channels = NULL; 1785 1786 ret = ctcm_register_dbf_views(); 1787 if (ret) 1788 goto out_err; 1789 ctcm_root_dev = root_device_register("ctcm"); 1790 ret = PTR_ERR_OR_ZERO(ctcm_root_dev); 1791 if (ret) 1792 goto register_err; 1793 ret = ccw_driver_register(&ctcm_ccw_driver); 1794 if (ret) 1795 goto ccw_err; 1796 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups; 1797 ret = ccwgroup_driver_register(&ctcm_group_driver); 1798 if (ret) 1799 goto ccwgroup_err; 1800 print_banner(); 1801 return 0; 1802 1803ccwgroup_err: 1804 ccw_driver_unregister(&ctcm_ccw_driver); 1805ccw_err: 1806 root_device_unregister(ctcm_root_dev); 1807register_err: 1808 ctcm_unregister_dbf_views(); 1809out_err: 1810 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1811 __func__, ret); 1812 return ret; 1813} 1814 1815module_init(ctcm_init); 1816module_exit(ctcm_exit); 1817 1818MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1819MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1820MODULE_LICENSE("GPL"); 1821 1822