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 */ ctcm_unpack_skb(struct channel * ch,struct sk_buff * pskb)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(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 */ channel_free(struct channel * ch)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 */ channel_remove(struct channel * ch)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 */ channel_get(enum ctcm_channel_types type,char * id,int direction)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 ctcm_check_irb_error(struct ccw_device * cdev,struct irb * irb)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 */ ccw_unit_check(struct channel * ch,__u8 sense)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 ctcm_ch_alloc_buffer(struct channel * ch)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 */ ctcm_open(struct net_device * dev)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 */ ctcm_close(struct net_device * dev)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 */ ctcm_transmit_skb(struct channel * ch,struct sk_buff * skb)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], 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 } 592 done: 593 ctcm_clear_busy(ch->netdev); 594 return rc; 595 } 596 ctcmpc_send_sweep_req(struct channel * rch)597 static void ctcmpc_send_sweep_req(struct channel *rch) 598 { 599 struct net_device *dev = rch->netdev; 600 struct ctcm_priv *priv; 601 struct mpc_group *grp; 602 struct th_sweep *header; 603 struct sk_buff *sweep_skb; 604 struct channel *ch; 605 /* int rc = 0; */ 606 607 priv = dev->ml_priv; 608 grp = priv->mpcg; 609 ch = priv->channel[CTCM_WRITE]; 610 611 /* sweep processing is not complete until response and request */ 612 /* has completed for all read channels in group */ 613 if (grp->in_sweep == 0) { 614 grp->in_sweep = 1; 615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 617 } 618 619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 620 621 if (sweep_skb == NULL) { 622 /* rc = -ENOMEM; */ 623 goto nomem; 624 } 625 626 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH); 627 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ 628 header->sw.th_last_seq = ch->th_seq_num; 629 630 netif_trans_update(dev); 631 skb_queue_tail(&ch->sweep_queue, sweep_skb); 632 633 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 634 635 return; 636 637 nomem: 638 grp->in_sweep = 0; 639 ctcm_clear_busy(dev); 640 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 641 642 return; 643 } 644 645 /* 646 * MPC mode version of transmit_skb 647 */ ctcmpc_transmit_skb(struct channel * ch,struct sk_buff * skb)648 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) 649 { 650 struct pdu *p_header; 651 struct net_device *dev = ch->netdev; 652 struct ctcm_priv *priv = dev->ml_priv; 653 struct mpc_group *grp = priv->mpcg; 654 struct th_header *header; 655 struct sk_buff *nskb; 656 int rc = 0; 657 int ccw_idx; 658 unsigned long hi; 659 unsigned long saveflags = 0; /* avoids compiler warning */ 660 661 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", 662 __func__, dev->name, smp_processor_id(), ch, 663 ch->id, fsm_getstate_str(ch->fsm)); 664 665 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { 666 spin_lock_irqsave(&ch->collect_lock, saveflags); 667 refcount_inc(&skb->users); 668 669 p_header = skb_push(skb, PDU_HEADER_LENGTH); 670 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH; 671 p_header->pdu_proto = 0x01; 672 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { 673 p_header->pdu_flag = PDU_FIRST | PDU_CNTL; 674 } else { 675 p_header->pdu_flag = PDU_FIRST; 676 } 677 p_header->pdu_seq = 0; 678 679 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" 680 "pdu header and data for up to 32 bytes:\n", 681 __func__, dev->name, skb->len); 682 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 683 684 skb_queue_tail(&ch->collect_queue, skb); 685 ch->collect_len += skb->len; 686 687 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 688 goto done; 689 } 690 691 /* 692 * Protect skb against beeing free'd by upper 693 * layers. 694 */ 695 refcount_inc(&skb->users); 696 697 /* 698 * IDAL support in CTCM is broken, so we have to 699 * care about skb's above 2G ourselves. 700 */ 701 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; 702 if (hi) { 703 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); 704 if (!nskb) { 705 goto nomem_exit; 706 } else { 707 skb_put_data(nskb, skb->data, skb->len); 708 refcount_inc(&nskb->users); 709 refcount_dec(&skb->users); 710 dev_kfree_skb_irq(skb); 711 skb = nskb; 712 } 713 } 714 715 p_header = skb_push(skb, PDU_HEADER_LENGTH); 716 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH; 717 p_header->pdu_proto = 0x01; 718 p_header->pdu_seq = 0; 719 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) { 720 p_header->pdu_flag = PDU_FIRST | PDU_CNTL; 721 } else { 722 p_header->pdu_flag = PDU_FIRST; 723 } 724 725 if (ch->collect_len > 0) { 726 spin_lock_irqsave(&ch->collect_lock, saveflags); 727 skb_queue_tail(&ch->collect_queue, skb); 728 ch->collect_len += skb->len; 729 skb = skb_dequeue(&ch->collect_queue); 730 ch->collect_len -= skb->len; 731 spin_unlock_irqrestore(&ch->collect_lock, saveflags); 732 } 733 734 p_header = (struct pdu *)skb->data; 735 p_header->pdu_flag |= PDU_LAST; 736 737 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; 738 739 /* put the TH on the packet */ 740 header = skb_push(skb, TH_HEADER_LENGTH); 741 memset(header, 0, TH_HEADER_LENGTH); 742 743 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 744 ch->th_seq_num++; 745 header->th_seq_num = ch->th_seq_num; 746 747 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , 748 __func__, dev->name, ch->th_seq_num); 749 750 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " 751 "up to 32 bytes sent to vtam:\n", 752 __func__, dev->name, skb->len); 753 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 754 755 ch->ccw[4].count = skb->len; 756 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 757 /* 758 * idal allocation failed, try via copying to trans_skb. 759 * trans_skb usually has a pre-allocated idal. 760 */ 761 if (ctcm_checkalloc_buffer(ch)) { 762 /* 763 * Remove our header. 764 * It gets added again on retransmit. 765 */ 766 goto nomem_exit; 767 } 768 769 skb_reset_tail_pointer(ch->trans_skb); 770 ch->trans_skb->len = 0; 771 ch->ccw[1].count = skb->len; 772 skb_put_data(ch->trans_skb, skb->data, skb->len); 773 refcount_dec(&skb->users); 774 dev_kfree_skb_irq(skb); 775 ccw_idx = 0; 776 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" 777 "up to 32 bytes sent to vtam:\n", 778 __func__, dev->name, ch->trans_skb->len); 779 CTCM_D3_DUMP((char *)ch->trans_skb->data, 780 min_t(int, 32, ch->trans_skb->len)); 781 } else { 782 skb_queue_tail(&ch->io_queue, skb); 783 ccw_idx = 3; 784 } 785 ch->retry = 0; 786 fsm_newstate(ch->fsm, CTC_STATE_TX); 787 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 788 789 if (do_debug_ccw) 790 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], 791 sizeof(struct ccw1) * 3); 792 793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 794 ch->prof.send_stamp = jiffies; 795 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0); 796 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 797 if (ccw_idx == 3) 798 ch->prof.doios_single++; 799 if (rc != 0) { 800 fsm_deltimer(&ch->timer); 801 ctcm_ccw_check_rc(ch, rc, "single skb TX"); 802 if (ccw_idx == 3) 803 skb_dequeue_tail(&ch->io_queue); 804 } else if (ccw_idx == 0) { 805 priv->stats.tx_packets++; 806 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 807 } 808 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ 809 ctcmpc_send_sweep_req(ch); 810 811 goto done; 812 nomem_exit: 813 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, 814 "%s(%s): MEMORY allocation ERROR\n", 815 CTCM_FUNTAIL, ch->id); 816 rc = -ENOMEM; 817 refcount_dec(&skb->users); 818 dev_kfree_skb_any(skb); 819 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 820 done: 821 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); 822 return rc; 823 } 824 825 /* 826 * Start transmission of a packet. 827 * Called from generic network device layer. 828 */ 829 /* first merge version - leaving both functions separated */ ctcm_tx(struct sk_buff * skb,struct net_device * dev)830 static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev) 831 { 832 struct ctcm_priv *priv = dev->ml_priv; 833 834 if (skb == NULL) { 835 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 836 "%s(%s): NULL sk_buff passed", 837 CTCM_FUNTAIL, dev->name); 838 priv->stats.tx_dropped++; 839 return NETDEV_TX_OK; 840 } 841 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { 842 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 843 "%s(%s): Got sk_buff with head room < %ld bytes", 844 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); 845 dev_kfree_skb(skb); 846 priv->stats.tx_dropped++; 847 return NETDEV_TX_OK; 848 } 849 850 /* 851 * If channels are not running, try to restart them 852 * and throw away packet. 853 */ 854 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { 855 fsm_event(priv->fsm, DEV_EVENT_START, dev); 856 dev_kfree_skb(skb); 857 priv->stats.tx_dropped++; 858 priv->stats.tx_errors++; 859 priv->stats.tx_carrier_errors++; 860 return NETDEV_TX_OK; 861 } 862 863 if (ctcm_test_and_set_busy(dev)) 864 return NETDEV_TX_BUSY; 865 866 netif_trans_update(dev); 867 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) 868 return NETDEV_TX_BUSY; 869 return NETDEV_TX_OK; 870 } 871 872 /* unmerged MPC variant of ctcm_tx */ ctcmpc_tx(struct sk_buff * skb,struct net_device * dev)873 static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) 874 { 875 int len = 0; 876 struct ctcm_priv *priv = dev->ml_priv; 877 struct mpc_group *grp = priv->mpcg; 878 struct sk_buff *newskb = NULL; 879 880 /* 881 * Some sanity checks ... 882 */ 883 if (skb == NULL) { 884 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 885 "%s(%s): NULL sk_buff passed", 886 CTCM_FUNTAIL, dev->name); 887 priv->stats.tx_dropped++; 888 goto done; 889 } 890 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { 891 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 892 "%s(%s): Got sk_buff with head room < %ld bytes", 893 CTCM_FUNTAIL, dev->name, 894 TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 895 896 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); 897 898 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 899 newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA); 900 901 if (!newskb) { 902 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 903 "%s: %s: __dev_alloc_skb failed", 904 __func__, dev->name); 905 906 dev_kfree_skb_any(skb); 907 priv->stats.tx_dropped++; 908 priv->stats.tx_errors++; 909 priv->stats.tx_carrier_errors++; 910 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 911 goto done; 912 } 913 newskb->protocol = skb->protocol; 914 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); 915 skb_put_data(newskb, skb->data, skb->len); 916 dev_kfree_skb_any(skb); 917 skb = newskb; 918 } 919 920 /* 921 * If channels are not running, 922 * notify anybody about a link failure and throw 923 * away packet. 924 */ 925 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || 926 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 927 dev_kfree_skb_any(skb); 928 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 929 "%s(%s): inactive MPCGROUP - dropped", 930 CTCM_FUNTAIL, dev->name); 931 priv->stats.tx_dropped++; 932 priv->stats.tx_errors++; 933 priv->stats.tx_carrier_errors++; 934 goto done; 935 } 936 937 if (ctcm_test_and_set_busy(dev)) { 938 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 939 "%s(%s): device busy - dropped", 940 CTCM_FUNTAIL, dev->name); 941 dev_kfree_skb_any(skb); 942 priv->stats.tx_dropped++; 943 priv->stats.tx_errors++; 944 priv->stats.tx_carrier_errors++; 945 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 946 goto done; 947 } 948 949 netif_trans_update(dev); 950 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) { 951 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 952 "%s(%s): device error - dropped", 953 CTCM_FUNTAIL, dev->name); 954 dev_kfree_skb_any(skb); 955 priv->stats.tx_dropped++; 956 priv->stats.tx_errors++; 957 priv->stats.tx_carrier_errors++; 958 ctcm_clear_busy(dev); 959 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 960 goto done; 961 } 962 ctcm_clear_busy(dev); 963 done: 964 if (do_debug) 965 MPC_DBF_DEV_NAME(TRACE, dev, "exit"); 966 967 return NETDEV_TX_OK; /* handle freeing of skb here */ 968 } 969 970 971 /* 972 * Sets MTU of an interface. 973 * 974 * dev Pointer to interface struct. 975 * new_mtu The new MTU to use for this interface. 976 * 977 * returns 0 on success, -EINVAL if MTU is out of valid range. 978 * (valid range is 576 .. 65527). If VM is on the 979 * remote side, maximum MTU is 32760, however this is 980 * not checked here. 981 */ ctcm_change_mtu(struct net_device * dev,int new_mtu)982 static int ctcm_change_mtu(struct net_device *dev, int new_mtu) 983 { 984 struct ctcm_priv *priv; 985 int max_bufsize; 986 987 priv = dev->ml_priv; 988 max_bufsize = priv->channel[CTCM_READ]->max_bufsize; 989 990 if (IS_MPC(priv)) { 991 if (new_mtu > max_bufsize - TH_HEADER_LENGTH) 992 return -EINVAL; 993 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 994 } else { 995 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) 996 return -EINVAL; 997 dev->hard_header_len = LL_HEADER_LENGTH + 2; 998 } 999 dev->mtu = new_mtu; 1000 return 0; 1001 } 1002 1003 /* 1004 * Returns interface statistics of a device. 1005 * 1006 * dev Pointer to interface struct. 1007 * 1008 * returns Pointer to stats struct of this interface. 1009 */ ctcm_stats(struct net_device * dev)1010 static struct net_device_stats *ctcm_stats(struct net_device *dev) 1011 { 1012 return &((struct ctcm_priv *)dev->ml_priv)->stats; 1013 } 1014 ctcm_free_netdevice(struct net_device * dev)1015 static void ctcm_free_netdevice(struct net_device *dev) 1016 { 1017 struct ctcm_priv *priv; 1018 struct mpc_group *grp; 1019 1020 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1021 "%s(%s)", CTCM_FUNTAIL, dev->name); 1022 priv = dev->ml_priv; 1023 if (priv) { 1024 grp = priv->mpcg; 1025 if (grp) { 1026 if (grp->fsm) 1027 kfree_fsm(grp->fsm); 1028 dev_kfree_skb(grp->xid_skb); 1029 dev_kfree_skb(grp->rcvd_xid_skb); 1030 tasklet_kill(&grp->mpc_tasklet2); 1031 kfree(grp); 1032 priv->mpcg = NULL; 1033 } 1034 if (priv->fsm) { 1035 kfree_fsm(priv->fsm); 1036 priv->fsm = NULL; 1037 } 1038 kfree(priv->xid); 1039 priv->xid = NULL; 1040 /* 1041 * Note: kfree(priv); is done in "opposite" function of 1042 * allocator function probe_device which is remove_device. 1043 */ 1044 } 1045 #ifdef MODULE 1046 free_netdev(dev); 1047 #endif 1048 } 1049 1050 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); 1051 1052 static const struct net_device_ops ctcm_netdev_ops = { 1053 .ndo_open = ctcm_open, 1054 .ndo_stop = ctcm_close, 1055 .ndo_get_stats = ctcm_stats, 1056 .ndo_change_mtu = ctcm_change_mtu, 1057 .ndo_start_xmit = ctcm_tx, 1058 }; 1059 1060 static const struct net_device_ops ctcm_mpc_netdev_ops = { 1061 .ndo_open = ctcm_open, 1062 .ndo_stop = ctcm_close, 1063 .ndo_get_stats = ctcm_stats, 1064 .ndo_change_mtu = ctcm_change_mtu, 1065 .ndo_start_xmit = ctcmpc_tx, 1066 }; 1067 ctcm_dev_setup(struct net_device * dev)1068 static void ctcm_dev_setup(struct net_device *dev) 1069 { 1070 dev->type = ARPHRD_SLIP; 1071 dev->tx_queue_len = 100; 1072 dev->flags = IFF_POINTOPOINT | IFF_NOARP; 1073 dev->min_mtu = 576; 1074 dev->max_mtu = 65527; 1075 } 1076 1077 /* 1078 * Initialize everything of the net device except the name and the 1079 * channel structs. 1080 */ ctcm_init_netdevice(struct ctcm_priv * priv)1081 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) 1082 { 1083 struct net_device *dev; 1084 struct mpc_group *grp; 1085 if (!priv) 1086 return NULL; 1087 1088 if (IS_MPC(priv)) 1089 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN, 1090 ctcm_dev_setup); 1091 else 1092 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN, 1093 ctcm_dev_setup); 1094 1095 if (!dev) { 1096 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 1097 "%s: MEMORY allocation ERROR", 1098 CTCM_FUNTAIL); 1099 return NULL; 1100 } 1101 dev->ml_priv = priv; 1102 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, 1103 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, 1104 dev_fsm, dev_fsm_len, GFP_KERNEL); 1105 if (priv->fsm == NULL) { 1106 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); 1107 free_netdev(dev); 1108 return NULL; 1109 } 1110 fsm_newstate(priv->fsm, DEV_STATE_STOPPED); 1111 fsm_settimer(priv->fsm, &priv->restart_timer); 1112 1113 if (IS_MPC(priv)) { 1114 /* MPC Group Initializations */ 1115 grp = ctcmpc_init_mpc_group(priv); 1116 if (grp == NULL) { 1117 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); 1118 free_netdev(dev); 1119 return NULL; 1120 } 1121 tasklet_init(&grp->mpc_tasklet2, 1122 mpc_group_ready, (unsigned long)dev); 1123 dev->mtu = MPC_BUFSIZE_DEFAULT - 1124 TH_HEADER_LENGTH - PDU_HEADER_LENGTH; 1125 1126 dev->netdev_ops = &ctcm_mpc_netdev_ops; 1127 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1128 priv->buffer_size = MPC_BUFSIZE_DEFAULT; 1129 } else { 1130 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; 1131 dev->netdev_ops = &ctcm_netdev_ops; 1132 dev->hard_header_len = LL_HEADER_LENGTH + 2; 1133 } 1134 1135 CTCMY_DBF_DEV(SETUP, dev, "finished"); 1136 1137 return dev; 1138 } 1139 1140 /* 1141 * Main IRQ handler. 1142 * 1143 * cdev The ccw_device the interrupt is for. 1144 * intparm interruption parameter. 1145 * irb interruption response block. 1146 */ ctcm_irq_handler(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)1147 static void ctcm_irq_handler(struct ccw_device *cdev, 1148 unsigned long intparm, struct irb *irb) 1149 { 1150 struct channel *ch; 1151 struct net_device *dev; 1152 struct ctcm_priv *priv; 1153 struct ccwgroup_device *cgdev; 1154 int cstat; 1155 int dstat; 1156 1157 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1158 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); 1159 1160 if (ctcm_check_irb_error(cdev, irb)) 1161 return; 1162 1163 cgdev = dev_get_drvdata(&cdev->dev); 1164 1165 cstat = irb->scsw.cmd.cstat; 1166 dstat = irb->scsw.cmd.dstat; 1167 1168 /* Check for unsolicited interrupts. */ 1169 if (cgdev == NULL) { 1170 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, 1171 "%s(%s) unsolicited irq: c-%02x d-%02x\n", 1172 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); 1173 dev_warn(&cdev->dev, 1174 "The adapter received a non-specific IRQ\n"); 1175 return; 1176 } 1177 1178 priv = dev_get_drvdata(&cgdev->dev); 1179 1180 /* Try to extract channel from driver data. */ 1181 if (priv->channel[CTCM_READ]->cdev == cdev) 1182 ch = priv->channel[CTCM_READ]; 1183 else if (priv->channel[CTCM_WRITE]->cdev == cdev) 1184 ch = priv->channel[CTCM_WRITE]; 1185 else { 1186 dev_err(&cdev->dev, 1187 "%s: Internal error: Can't determine channel for " 1188 "interrupt device %s\n", 1189 __func__, dev_name(&cdev->dev)); 1190 /* Explain: inconsistent internal structures */ 1191 return; 1192 } 1193 1194 dev = ch->netdev; 1195 if (dev == NULL) { 1196 dev_err(&cdev->dev, 1197 "%s Internal error: net_device is NULL, ch = 0x%p\n", 1198 __func__, ch); 1199 /* Explain: inconsistent internal structures */ 1200 return; 1201 } 1202 1203 /* Copy interruption response block. */ 1204 memcpy(ch->irb, irb, sizeof(struct irb)); 1205 1206 /* Issue error message and return on subchannel error code */ 1207 if (irb->scsw.cmd.cstat) { 1208 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); 1209 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1210 "%s(%s): sub-ch check %s: cs=%02x ds=%02x", 1211 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); 1212 dev_warn(&cdev->dev, 1213 "A check occurred on the subchannel\n"); 1214 return; 1215 } 1216 1217 /* Check the reason-code of a unit check */ 1218 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { 1219 if ((irb->ecw[0] & ch->sense_rc) == 0) 1220 /* print it only once */ 1221 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, 1222 "%s(%s): sense=%02x, ds=%02x", 1223 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); 1224 ccw_unit_check(ch, irb->ecw[0]); 1225 return; 1226 } 1227 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { 1228 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) 1229 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); 1230 else 1231 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); 1232 return; 1233 } 1234 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 1235 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); 1236 return; 1237 } 1238 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || 1239 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || 1240 (irb->scsw.cmd.stctl == 1241 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) 1242 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); 1243 else 1244 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); 1245 1246 } 1247 1248 static const struct device_type ctcm_devtype = { 1249 .name = "ctcm", 1250 .groups = ctcm_attr_groups, 1251 }; 1252 1253 /* 1254 * Add ctcm specific attributes. 1255 * Add ctcm private data. 1256 * 1257 * cgdev pointer to ccwgroup_device just added 1258 * 1259 * returns 0 on success, !0 on failure. 1260 */ ctcm_probe_device(struct ccwgroup_device * cgdev)1261 static int ctcm_probe_device(struct ccwgroup_device *cgdev) 1262 { 1263 struct ctcm_priv *priv; 1264 1265 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1266 "%s %p", 1267 __func__, cgdev); 1268 1269 if (!get_device(&cgdev->dev)) 1270 return -ENODEV; 1271 1272 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); 1273 if (!priv) { 1274 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1275 "%s: memory allocation failure", 1276 CTCM_FUNTAIL); 1277 put_device(&cgdev->dev); 1278 return -ENOMEM; 1279 } 1280 priv->buffer_size = CTCM_BUFSIZE_DEFAULT; 1281 cgdev->cdev[0]->handler = ctcm_irq_handler; 1282 cgdev->cdev[1]->handler = ctcm_irq_handler; 1283 dev_set_drvdata(&cgdev->dev, priv); 1284 cgdev->dev.type = &ctcm_devtype; 1285 1286 return 0; 1287 } 1288 1289 /* 1290 * Add a new channel to the list of channels. 1291 * Keeps the channel list sorted. 1292 * 1293 * cdev The ccw_device to be added. 1294 * type The type class of the new channel. 1295 * priv Points to the private data of the ccwgroup_device. 1296 * 1297 * returns 0 on success, !0 on error. 1298 */ add_channel(struct ccw_device * cdev,enum ctcm_channel_types type,struct ctcm_priv * priv)1299 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type, 1300 struct ctcm_priv *priv) 1301 { 1302 struct channel **c = &channels; 1303 struct channel *ch; 1304 int ccw_num; 1305 int rc = 0; 1306 1307 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1308 "%s(%s), type %d, proto %d", 1309 __func__, dev_name(&cdev->dev), type, priv->protocol); 1310 1311 ch = kzalloc(sizeof(struct channel), GFP_KERNEL); 1312 if (ch == NULL) 1313 return -ENOMEM; 1314 1315 ch->protocol = priv->protocol; 1316 if (IS_MPC(priv)) { 1317 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL); 1318 if (ch->discontact_th == NULL) 1319 goto nomem_return; 1320 1321 ch->discontact_th->th_blk_flag = TH_DISCONTACT; 1322 tasklet_init(&ch->ch_disc_tasklet, 1323 mpc_action_send_discontact, (unsigned long)ch); 1324 1325 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); 1326 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); 1327 ccw_num = 17; 1328 } else 1329 ccw_num = 8; 1330 1331 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); 1332 if (ch->ccw == NULL) 1333 goto nomem_return; 1334 1335 ch->cdev = cdev; 1336 scnprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); 1337 ch->type = type; 1338 1339 /* 1340 * "static" ccws are used in the following way: 1341 * 1342 * ccw[0..2] (Channel program for generic I/O): 1343 * 0: prepare 1344 * 1: read or write (depending on direction) with fixed 1345 * buffer (idal allocated once when buffer is allocated) 1346 * 2: nop 1347 * ccw[3..5] (Channel program for direct write of packets) 1348 * 3: prepare 1349 * 4: write (idal allocated on every write). 1350 * 5: nop 1351 * ccw[6..7] (Channel program for initial channel setup): 1352 * 6: set extended mode 1353 * 7: nop 1354 * 1355 * ch->ccw[0..5] are initialized in ch_action_start because 1356 * the channel's direction is yet unknown here. 1357 * 1358 * ccws used for xid2 negotiations 1359 * ch-ccw[8-14] need to be used for the XID exchange either 1360 * X side XID2 Processing 1361 * 8: write control 1362 * 9: write th 1363 * 10: write XID 1364 * 11: read th from secondary 1365 * 12: read XID from secondary 1366 * 13: read 4 byte ID 1367 * 14: nop 1368 * Y side XID Processing 1369 * 8: sense 1370 * 9: read th 1371 * 10: read XID 1372 * 11: write th 1373 * 12: write XID 1374 * 13: write 4 byte ID 1375 * 14: nop 1376 * 1377 * ccws used for double noop due to VM timing issues 1378 * which result in unrecoverable Busy on channel 1379 * 15: nop 1380 * 16: nop 1381 */ 1382 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; 1383 ch->ccw[6].flags = CCW_FLAG_SLI; 1384 1385 ch->ccw[7].cmd_code = CCW_CMD_NOOP; 1386 ch->ccw[7].flags = CCW_FLAG_SLI; 1387 1388 if (IS_MPC(priv)) { 1389 ch->ccw[15].cmd_code = CCW_CMD_WRITE; 1390 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1391 ch->ccw[15].count = TH_HEADER_LENGTH; 1392 ch->ccw[15].cda = virt_to_phys(ch->discontact_th); 1393 1394 ch->ccw[16].cmd_code = CCW_CMD_NOOP; 1395 ch->ccw[16].flags = CCW_FLAG_SLI; 1396 1397 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1398 ctc_ch_event_names, CTC_MPC_NR_STATES, 1399 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, 1400 mpc_ch_fsm_len, GFP_KERNEL); 1401 } else { 1402 ch->fsm = init_fsm(ch->id, ctc_ch_state_names, 1403 ctc_ch_event_names, CTC_NR_STATES, 1404 CTC_NR_EVENTS, ch_fsm, 1405 ch_fsm_len, GFP_KERNEL); 1406 } 1407 if (ch->fsm == NULL) 1408 goto nomem_return; 1409 1410 fsm_newstate(ch->fsm, CTC_STATE_IDLE); 1411 1412 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); 1413 if (ch->irb == NULL) 1414 goto nomem_return; 1415 1416 while (*c && ctcm_less_than((*c)->id, ch->id)) 1417 c = &(*c)->next; 1418 1419 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { 1420 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1421 "%s (%s) already in list, using old entry", 1422 __func__, (*c)->id); 1423 1424 goto free_return; 1425 } 1426 1427 spin_lock_init(&ch->collect_lock); 1428 1429 fsm_settimer(ch->fsm, &ch->timer); 1430 skb_queue_head_init(&ch->io_queue); 1431 skb_queue_head_init(&ch->collect_queue); 1432 1433 if (IS_MPC(priv)) { 1434 fsm_settimer(ch->fsm, &ch->sweep_timer); 1435 skb_queue_head_init(&ch->sweep_queue); 1436 } 1437 ch->next = *c; 1438 *c = ch; 1439 return 0; 1440 1441 nomem_return: 1442 rc = -ENOMEM; 1443 1444 free_return: /* note that all channel pointers are 0 or valid */ 1445 kfree(ch->ccw); 1446 kfree(ch->discontact_th); 1447 kfree_fsm(ch->fsm); 1448 kfree(ch->irb); 1449 kfree(ch); 1450 return rc; 1451 } 1452 1453 /* 1454 * Return type of a detected device. 1455 */ get_channel_type(struct ccw_device_id * id)1456 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id) 1457 { 1458 enum ctcm_channel_types type; 1459 type = (enum ctcm_channel_types)id->driver_info; 1460 1461 if (type == ctcm_channel_type_ficon) 1462 type = ctcm_channel_type_escon; 1463 1464 return type; 1465 } 1466 1467 /* 1468 * 1469 * Setup an interface. 1470 * 1471 * cgdev Device to be setup. 1472 * 1473 * returns 0 on success, !0 on failure. 1474 */ ctcm_new_device(struct ccwgroup_device * cgdev)1475 static int ctcm_new_device(struct ccwgroup_device *cgdev) 1476 { 1477 char read_id[CTCM_ID_SIZE]; 1478 char write_id[CTCM_ID_SIZE]; 1479 int direction; 1480 enum ctcm_channel_types type; 1481 struct ctcm_priv *priv; 1482 struct net_device *dev; 1483 struct ccw_device *cdev0; 1484 struct ccw_device *cdev1; 1485 struct channel *readc; 1486 struct channel *writec; 1487 int ret; 1488 int result; 1489 1490 priv = dev_get_drvdata(&cgdev->dev); 1491 if (!priv) { 1492 result = -ENODEV; 1493 goto out_err_result; 1494 } 1495 1496 cdev0 = cgdev->cdev[0]; 1497 cdev1 = cgdev->cdev[1]; 1498 1499 type = get_channel_type(&cdev0->id); 1500 1501 scnprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); 1502 scnprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); 1503 1504 ret = add_channel(cdev0, type, priv); 1505 if (ret) { 1506 result = ret; 1507 goto out_err_result; 1508 } 1509 ret = add_channel(cdev1, type, priv); 1510 if (ret) { 1511 result = ret; 1512 goto out_remove_channel1; 1513 } 1514 1515 ret = ccw_device_set_online(cdev0); 1516 if (ret != 0) { 1517 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1518 "%s(%s) set_online rc=%d", 1519 CTCM_FUNTAIL, read_id, ret); 1520 result = -EIO; 1521 goto out_remove_channel2; 1522 } 1523 1524 ret = ccw_device_set_online(cdev1); 1525 if (ret != 0) { 1526 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 1527 "%s(%s) set_online rc=%d", 1528 CTCM_FUNTAIL, write_id, ret); 1529 1530 result = -EIO; 1531 goto out_ccw1; 1532 } 1533 1534 dev = ctcm_init_netdevice(priv); 1535 if (dev == NULL) { 1536 result = -ENODEV; 1537 goto out_ccw2; 1538 } 1539 1540 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1541 priv->channel[direction] = 1542 channel_get(type, direction == CTCM_READ ? 1543 read_id : write_id, direction); 1544 if (priv->channel[direction] == NULL) { 1545 if (direction == CTCM_WRITE) 1546 channel_free(priv->channel[CTCM_READ]); 1547 result = -ENODEV; 1548 goto out_dev; 1549 } 1550 priv->channel[direction]->netdev = dev; 1551 priv->channel[direction]->protocol = priv->protocol; 1552 priv->channel[direction]->max_bufsize = priv->buffer_size; 1553 } 1554 /* sysfs magic */ 1555 SET_NETDEV_DEV(dev, &cgdev->dev); 1556 1557 if (register_netdev(dev)) { 1558 result = -ENODEV; 1559 goto out_dev; 1560 } 1561 1562 strscpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); 1563 1564 dev_info(&dev->dev, 1565 "setup OK : r/w = %s/%s, protocol : %d\n", 1566 priv->channel[CTCM_READ]->id, 1567 priv->channel[CTCM_WRITE]->id, priv->protocol); 1568 1569 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1570 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, 1571 priv->channel[CTCM_READ]->id, 1572 priv->channel[CTCM_WRITE]->id, priv->protocol); 1573 1574 return 0; 1575 out_dev: 1576 ctcm_free_netdevice(dev); 1577 out_ccw2: 1578 ccw_device_set_offline(cgdev->cdev[1]); 1579 out_ccw1: 1580 ccw_device_set_offline(cgdev->cdev[0]); 1581 out_remove_channel2: 1582 readc = channel_get(type, read_id, CTCM_READ); 1583 channel_remove(readc); 1584 out_remove_channel1: 1585 writec = channel_get(type, write_id, CTCM_WRITE); 1586 channel_remove(writec); 1587 out_err_result: 1588 return result; 1589 } 1590 1591 /* 1592 * Shutdown an interface. 1593 * 1594 * cgdev Device to be shut down. 1595 * 1596 * returns 0 on success, !0 on failure. 1597 */ ctcm_shutdown_device(struct ccwgroup_device * cgdev)1598 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) 1599 { 1600 struct ctcm_priv *priv; 1601 struct net_device *dev; 1602 1603 priv = dev_get_drvdata(&cgdev->dev); 1604 if (!priv) 1605 return -ENODEV; 1606 1607 if (priv->channel[CTCM_READ]) { 1608 dev = priv->channel[CTCM_READ]->netdev; 1609 CTCM_DBF_DEV(SETUP, dev, ""); 1610 /* Close the device */ 1611 ctcm_close(dev); 1612 dev->flags &= ~IFF_RUNNING; 1613 channel_free(priv->channel[CTCM_READ]); 1614 } else 1615 dev = NULL; 1616 1617 if (priv->channel[CTCM_WRITE]) 1618 channel_free(priv->channel[CTCM_WRITE]); 1619 1620 if (dev) { 1621 unregister_netdev(dev); 1622 ctcm_free_netdevice(dev); 1623 } 1624 1625 if (priv->fsm) 1626 kfree_fsm(priv->fsm); 1627 1628 ccw_device_set_offline(cgdev->cdev[1]); 1629 ccw_device_set_offline(cgdev->cdev[0]); 1630 channel_remove(priv->channel[CTCM_READ]); 1631 channel_remove(priv->channel[CTCM_WRITE]); 1632 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL; 1633 1634 return 0; 1635 1636 } 1637 1638 ctcm_remove_device(struct ccwgroup_device * cgdev)1639 static void ctcm_remove_device(struct ccwgroup_device *cgdev) 1640 { 1641 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); 1642 1643 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, 1644 "removing device %p, proto : %d", 1645 cgdev, priv->protocol); 1646 1647 if (cgdev->state == CCWGROUP_ONLINE) 1648 ctcm_shutdown_device(cgdev); 1649 dev_set_drvdata(&cgdev->dev, NULL); 1650 kfree(priv); 1651 put_device(&cgdev->dev); 1652 } 1653 1654 static struct ccw_device_id ctcm_ids[] = { 1655 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel}, 1656 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon}, 1657 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon}, 1658 {}, 1659 }; 1660 MODULE_DEVICE_TABLE(ccw, ctcm_ids); 1661 1662 static struct ccw_driver ctcm_ccw_driver = { 1663 .driver = { 1664 .owner = THIS_MODULE, 1665 .name = "ctcm", 1666 }, 1667 .ids = ctcm_ids, 1668 .probe = ccwgroup_probe_ccwdev, 1669 .remove = ccwgroup_remove_ccwdev, 1670 .int_class = IRQIO_CTC, 1671 }; 1672 1673 static struct ccwgroup_driver ctcm_group_driver = { 1674 .driver = { 1675 .owner = THIS_MODULE, 1676 .name = CTC_DRIVER_NAME, 1677 }, 1678 .ccw_driver = &ctcm_ccw_driver, 1679 .setup = ctcm_probe_device, 1680 .remove = ctcm_remove_device, 1681 .set_online = ctcm_new_device, 1682 .set_offline = ctcm_shutdown_device, 1683 }; 1684 group_store(struct device_driver * ddrv,const char * buf,size_t count)1685 static ssize_t group_store(struct device_driver *ddrv, const char *buf, 1686 size_t count) 1687 { 1688 int err; 1689 1690 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf); 1691 return err ? err : count; 1692 } 1693 static DRIVER_ATTR_WO(group); 1694 1695 static struct attribute *ctcm_drv_attrs[] = { 1696 &driver_attr_group.attr, 1697 NULL, 1698 }; 1699 static struct attribute_group ctcm_drv_attr_group = { 1700 .attrs = ctcm_drv_attrs, 1701 }; 1702 static const struct attribute_group *ctcm_drv_attr_groups[] = { 1703 &ctcm_drv_attr_group, 1704 NULL, 1705 }; 1706 1707 /* 1708 * Module related routines 1709 */ 1710 1711 /* 1712 * Prepare to be unloaded. Free IRQ's and release all resources. 1713 * This is called just before this module is unloaded. It is 1714 * not called, if the usage count is !0, so we don't need to check 1715 * for that. 1716 */ ctcm_exit(void)1717 static void __exit ctcm_exit(void) 1718 { 1719 ccwgroup_driver_unregister(&ctcm_group_driver); 1720 ccw_driver_unregister(&ctcm_ccw_driver); 1721 root_device_unregister(ctcm_root_dev); 1722 ctcm_unregister_dbf_views(); 1723 pr_info("CTCM driver unloaded\n"); 1724 } 1725 1726 /* 1727 * Print Banner. 1728 */ print_banner(void)1729 static void print_banner(void) 1730 { 1731 pr_info("CTCM driver initialized\n"); 1732 } 1733 1734 /* 1735 * Initialize module. 1736 * This is called just after the module is loaded. 1737 * 1738 * returns 0 on success, !0 on error. 1739 */ ctcm_init(void)1740 static int __init ctcm_init(void) 1741 { 1742 int ret; 1743 1744 channels = NULL; 1745 1746 ret = ctcm_register_dbf_views(); 1747 if (ret) 1748 goto out_err; 1749 ctcm_root_dev = root_device_register("ctcm"); 1750 ret = PTR_ERR_OR_ZERO(ctcm_root_dev); 1751 if (ret) 1752 goto register_err; 1753 ret = ccw_driver_register(&ctcm_ccw_driver); 1754 if (ret) 1755 goto ccw_err; 1756 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups; 1757 ret = ccwgroup_driver_register(&ctcm_group_driver); 1758 if (ret) 1759 goto ccwgroup_err; 1760 print_banner(); 1761 return 0; 1762 1763 ccwgroup_err: 1764 ccw_driver_unregister(&ctcm_ccw_driver); 1765 ccw_err: 1766 root_device_unregister(ctcm_root_dev); 1767 register_err: 1768 ctcm_unregister_dbf_views(); 1769 out_err: 1770 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n", 1771 __func__, ret); 1772 return ret; 1773 } 1774 1775 module_init(ctcm_init); 1776 module_exit(ctcm_exit); 1777 1778 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); 1779 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); 1780 MODULE_LICENSE("GPL"); 1781 1782