Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * CTC / ESCON network driver |
| 3 | * |
| 4 | * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 5 | * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) |
| 6 | * Fixes by : Jochen Röhrig (roehrig@de.ibm.com) |
| 7 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
| 8 | Peter Tiedemann (ptiedem@de.ibm.com) |
Cornelia Huck | 4ce3b30 | 2006-01-14 13:21:04 -0800 | [diff] [blame] | 9 | * Driver Model stuff by : Cornelia Huck <huckc@de.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * Documentation used: |
| 12 | * - Principles of Operation (IBM doc#: SA22-7201-06) |
| 13 | * - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02) |
| 14 | * - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535) |
| 15 | * - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00) |
| 16 | * - ESCON I/O Interface (IBM doc#: SA22-7202-029 |
| 17 | * |
| 18 | * and the source of the original CTC driver by: |
| 19 | * Dieter Wellerdiek (wel@de.ibm.com) |
| 20 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 21 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
| 22 | * Jochen Röhrig (roehrig@de.ibm.com) |
| 23 | * |
| 24 | * This program is free software; you can redistribute it and/or modify |
| 25 | * it under the terms of the GNU General Public License as published by |
| 26 | * the Free Software Foundation; either version 2, or (at your option) |
| 27 | * any later version. |
| 28 | * |
| 29 | * This program is distributed in the hope that it will be useful, |
| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 32 | * GNU General Public License for more details. |
| 33 | * |
| 34 | * You should have received a copy of the GNU General Public License |
| 35 | * along with this program; if not, write to the Free Software |
| 36 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 37 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #undef DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/module.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/kernel.h> |
| 43 | #include <linux/slab.h> |
| 44 | #include <linux/errno.h> |
| 45 | #include <linux/types.h> |
| 46 | #include <linux/interrupt.h> |
| 47 | #include <linux/timer.h> |
| 48 | #include <linux/sched.h> |
| 49 | #include <linux/bitops.h> |
| 50 | |
| 51 | #include <linux/signal.h> |
| 52 | #include <linux/string.h> |
| 53 | |
| 54 | #include <linux/ip.h> |
| 55 | #include <linux/if_arp.h> |
| 56 | #include <linux/tcp.h> |
| 57 | #include <linux/skbuff.h> |
| 58 | #include <linux/ctype.h> |
| 59 | #include <net/dst.h> |
| 60 | |
| 61 | #include <asm/io.h> |
| 62 | #include <asm/ccwdev.h> |
| 63 | #include <asm/ccwgroup.h> |
| 64 | #include <asm/uaccess.h> |
| 65 | |
| 66 | #include <asm/idals.h> |
| 67 | |
| 68 | #include "ctctty.h" |
| 69 | #include "fsm.h" |
| 70 | #include "cu3088.h" |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include "ctcdbug.h" |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 73 | #include "ctcmain.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); |
| 76 | MODULE_DESCRIPTION("Linux for S/390 CTC/Escon Driver"); |
| 77 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | /** |
| 79 | * States of the interface statemachine. |
| 80 | */ |
| 81 | enum dev_states { |
| 82 | DEV_STATE_STOPPED, |
| 83 | DEV_STATE_STARTWAIT_RXTX, |
| 84 | DEV_STATE_STARTWAIT_RX, |
| 85 | DEV_STATE_STARTWAIT_TX, |
| 86 | DEV_STATE_STOPWAIT_RXTX, |
| 87 | DEV_STATE_STOPWAIT_RX, |
| 88 | DEV_STATE_STOPWAIT_TX, |
| 89 | DEV_STATE_RUNNING, |
| 90 | /** |
| 91 | * MUST be always the last element!! |
| 92 | */ |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 93 | CTC_NR_DEV_STATES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | static const char *dev_state_names[] = { |
| 97 | "Stopped", |
| 98 | "StartWait RXTX", |
| 99 | "StartWait RX", |
| 100 | "StartWait TX", |
| 101 | "StopWait RXTX", |
| 102 | "StopWait RX", |
| 103 | "StopWait TX", |
| 104 | "Running", |
| 105 | }; |
| 106 | |
| 107 | /** |
| 108 | * Events of the interface statemachine. |
| 109 | */ |
| 110 | enum dev_events { |
| 111 | DEV_EVENT_START, |
| 112 | DEV_EVENT_STOP, |
| 113 | DEV_EVENT_RXUP, |
| 114 | DEV_EVENT_TXUP, |
| 115 | DEV_EVENT_RXDOWN, |
| 116 | DEV_EVENT_TXDOWN, |
| 117 | DEV_EVENT_RESTART, |
| 118 | /** |
| 119 | * MUST be always the last element!! |
| 120 | */ |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 121 | CTC_NR_DEV_EVENTS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | }; |
| 123 | |
| 124 | static const char *dev_event_names[] = { |
| 125 | "Start", |
| 126 | "Stop", |
| 127 | "RX up", |
| 128 | "TX up", |
| 129 | "RX down", |
| 130 | "TX down", |
| 131 | "Restart", |
| 132 | }; |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /** |
| 135 | * Events of the channel statemachine |
| 136 | */ |
| 137 | enum ch_events { |
| 138 | /** |
| 139 | * Events, representing return code of |
| 140 | * I/O operations (ccw_device_start, ccw_device_halt et al.) |
| 141 | */ |
| 142 | CH_EVENT_IO_SUCCESS, |
| 143 | CH_EVENT_IO_EBUSY, |
| 144 | CH_EVENT_IO_ENODEV, |
| 145 | CH_EVENT_IO_EIO, |
| 146 | CH_EVENT_IO_UNKNOWN, |
| 147 | |
| 148 | CH_EVENT_ATTNBUSY, |
| 149 | CH_EVENT_ATTN, |
| 150 | CH_EVENT_BUSY, |
| 151 | |
| 152 | /** |
| 153 | * Events, representing unit-check |
| 154 | */ |
| 155 | CH_EVENT_UC_RCRESET, |
| 156 | CH_EVENT_UC_RSRESET, |
| 157 | CH_EVENT_UC_TXTIMEOUT, |
| 158 | CH_EVENT_UC_TXPARITY, |
| 159 | CH_EVENT_UC_HWFAIL, |
| 160 | CH_EVENT_UC_RXPARITY, |
| 161 | CH_EVENT_UC_ZERO, |
| 162 | CH_EVENT_UC_UNKNOWN, |
| 163 | |
| 164 | /** |
| 165 | * Events, representing subchannel-check |
| 166 | */ |
| 167 | CH_EVENT_SC_UNKNOWN, |
| 168 | |
| 169 | /** |
| 170 | * Events, representing machine checks |
| 171 | */ |
| 172 | CH_EVENT_MC_FAIL, |
| 173 | CH_EVENT_MC_GOOD, |
| 174 | |
| 175 | /** |
| 176 | * Event, representing normal IRQ |
| 177 | */ |
| 178 | CH_EVENT_IRQ, |
| 179 | CH_EVENT_FINSTAT, |
| 180 | |
| 181 | /** |
| 182 | * Event, representing timer expiry. |
| 183 | */ |
| 184 | CH_EVENT_TIMER, |
| 185 | |
| 186 | /** |
| 187 | * Events, representing commands from upper levels. |
| 188 | */ |
| 189 | CH_EVENT_START, |
| 190 | CH_EVENT_STOP, |
| 191 | |
| 192 | /** |
| 193 | * MUST be always the last element!! |
| 194 | */ |
| 195 | NR_CH_EVENTS, |
| 196 | }; |
| 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | /** |
| 199 | * States of the channel statemachine. |
| 200 | */ |
| 201 | enum ch_states { |
| 202 | /** |
| 203 | * Channel not assigned to any device, |
| 204 | * initial state, direction invalid |
| 205 | */ |
| 206 | CH_STATE_IDLE, |
| 207 | |
| 208 | /** |
| 209 | * Channel assigned but not operating |
| 210 | */ |
| 211 | CH_STATE_STOPPED, |
| 212 | CH_STATE_STARTWAIT, |
| 213 | CH_STATE_STARTRETRY, |
| 214 | CH_STATE_SETUPWAIT, |
| 215 | CH_STATE_RXINIT, |
| 216 | CH_STATE_TXINIT, |
| 217 | CH_STATE_RX, |
| 218 | CH_STATE_TX, |
| 219 | CH_STATE_RXIDLE, |
| 220 | CH_STATE_TXIDLE, |
| 221 | CH_STATE_RXERR, |
| 222 | CH_STATE_TXERR, |
| 223 | CH_STATE_TERM, |
| 224 | CH_STATE_DTERM, |
| 225 | CH_STATE_NOTOP, |
| 226 | |
| 227 | /** |
| 228 | * MUST be always the last element!! |
| 229 | */ |
| 230 | NR_CH_STATES, |
| 231 | }; |
| 232 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 233 | static int loglevel = CTC_LOGLEVEL_DEFAULT; |
| 234 | |
| 235 | /** |
| 236 | * Linked list of all detected channels. |
| 237 | */ |
| 238 | static struct channel *channels = NULL; |
| 239 | |
| 240 | /** |
| 241 | * Print Banner. |
| 242 | */ |
| 243 | static void |
| 244 | print_banner(void) |
| 245 | { |
| 246 | static int printed = 0; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 247 | |
| 248 | if (printed) |
| 249 | return; |
Heiko Carstens | e018ba1 | 2006-02-01 03:06:31 -0800 | [diff] [blame] | 250 | |
| 251 | printk(KERN_INFO "CTC driver initialized\n"); |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 252 | printed = 1; |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * Return type of a detected device. |
| 257 | */ |
| 258 | static enum channel_types |
| 259 | get_channel_type(struct ccw_device_id *id) |
| 260 | { |
| 261 | enum channel_types type = (enum channel_types) id->driver_info; |
| 262 | |
| 263 | if (type == channel_type_ficon) |
| 264 | type = channel_type_escon; |
| 265 | |
| 266 | return type; |
| 267 | } |
| 268 | |
| 269 | static const char *ch_event_names[] = { |
| 270 | "ccw_device success", |
| 271 | "ccw_device busy", |
| 272 | "ccw_device enodev", |
| 273 | "ccw_device ioerr", |
| 274 | "ccw_device unknown", |
| 275 | |
| 276 | "Status ATTN & BUSY", |
| 277 | "Status ATTN", |
| 278 | "Status BUSY", |
| 279 | |
| 280 | "Unit check remote reset", |
| 281 | "Unit check remote system reset", |
| 282 | "Unit check TX timeout", |
| 283 | "Unit check TX parity", |
| 284 | "Unit check Hardware failure", |
| 285 | "Unit check RX parity", |
| 286 | "Unit check ZERO", |
| 287 | "Unit check Unknown", |
| 288 | |
| 289 | "SubChannel check Unknown", |
| 290 | |
| 291 | "Machine check failure", |
| 292 | "Machine check operational", |
| 293 | |
| 294 | "IRQ normal", |
| 295 | "IRQ final", |
| 296 | |
| 297 | "Timer", |
| 298 | |
| 299 | "Start", |
| 300 | "Stop", |
| 301 | }; |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | static const char *ch_state_names[] = { |
| 304 | "Idle", |
| 305 | "Stopped", |
| 306 | "StartWait", |
| 307 | "StartRetry", |
| 308 | "SetupWait", |
| 309 | "RX init", |
| 310 | "TX init", |
| 311 | "RX", |
| 312 | "TX", |
| 313 | "RX idle", |
| 314 | "TX idle", |
| 315 | "RX error", |
| 316 | "TX error", |
| 317 | "Terminating", |
| 318 | "Restarting", |
| 319 | "Not operational", |
| 320 | }; |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | #ifdef DEBUG |
| 323 | /** |
| 324 | * Dump header and first 16 bytes of an sk_buff for debugging purposes. |
| 325 | * |
| 326 | * @param skb The sk_buff to dump. |
| 327 | * @param offset Offset relative to skb-data, where to start the dump. |
| 328 | */ |
| 329 | static void |
| 330 | ctc_dump_skb(struct sk_buff *skb, int offset) |
| 331 | { |
| 332 | unsigned char *p = skb->data; |
| 333 | __u16 bl; |
| 334 | struct ll_header *header; |
| 335 | int i; |
| 336 | |
| 337 | if (!(loglevel & CTC_LOGLEVEL_DEBUG)) |
| 338 | return; |
| 339 | p += offset; |
| 340 | bl = *((__u16 *) p); |
| 341 | p += 2; |
| 342 | header = (struct ll_header *) p; |
| 343 | p -= 2; |
| 344 | |
| 345 | printk(KERN_DEBUG "dump:\n"); |
| 346 | printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl); |
| 347 | |
| 348 | printk(KERN_DEBUG "h->length=%d %04x\n", header->length, |
| 349 | header->length); |
| 350 | printk(KERN_DEBUG "h->type=%04x\n", header->type); |
| 351 | printk(KERN_DEBUG "h->unused=%04x\n", header->unused); |
| 352 | if (bl > 16) |
| 353 | bl = 16; |
| 354 | printk(KERN_DEBUG "data: "); |
| 355 | for (i = 0; i < bl; i++) |
| 356 | printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>"); |
| 357 | printk("\n"); |
| 358 | } |
| 359 | #else |
| 360 | static inline void |
| 361 | ctc_dump_skb(struct sk_buff *skb, int offset) |
| 362 | { |
| 363 | } |
| 364 | #endif |
| 365 | |
| 366 | /** |
| 367 | * Unpack a just received skb and hand it over to |
| 368 | * upper layers. |
| 369 | * |
| 370 | * @param ch The channel where this skb has been received. |
| 371 | * @param pskb The received skb. |
| 372 | */ |
| 373 | static __inline__ void |
| 374 | ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb) |
| 375 | { |
| 376 | struct net_device *dev = ch->netdev; |
| 377 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; |
| 378 | __u16 len = *((__u16 *) pskb->data); |
| 379 | |
| 380 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 381 | skb_put(pskb, 2 + LL_HEADER_LENGTH); |
| 382 | skb_pull(pskb, 2); |
| 383 | pskb->dev = dev; |
| 384 | pskb->ip_summed = CHECKSUM_UNNECESSARY; |
| 385 | while (len > 0) { |
| 386 | struct sk_buff *skb; |
| 387 | struct ll_header *header = (struct ll_header *) pskb->data; |
| 388 | |
| 389 | skb_pull(pskb, LL_HEADER_LENGTH); |
| 390 | if ((ch->protocol == CTC_PROTO_S390) && |
| 391 | (header->type != ETH_P_IP)) { |
| 392 | |
| 393 | #ifndef DEBUG |
| 394 | if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { |
| 395 | #endif |
| 396 | /** |
| 397 | * Check packet type only if we stick strictly |
| 398 | * to S/390's protocol of OS390. This only |
| 399 | * supports IP. Otherwise allow any packet |
| 400 | * type. |
| 401 | */ |
| 402 | ctc_pr_warn( |
| 403 | "%s Illegal packet type 0x%04x received, dropping\n", |
| 404 | dev->name, header->type); |
| 405 | ch->logflags |= LOG_FLAG_ILLEGALPKT; |
| 406 | #ifndef DEBUG |
| 407 | } |
| 408 | #endif |
| 409 | #ifdef DEBUG |
| 410 | ctc_dump_skb(pskb, -6); |
| 411 | #endif |
| 412 | privptr->stats.rx_dropped++; |
| 413 | privptr->stats.rx_frame_errors++; |
| 414 | return; |
| 415 | } |
| 416 | pskb->protocol = ntohs(header->type); |
| 417 | if (header->length <= LL_HEADER_LENGTH) { |
| 418 | #ifndef DEBUG |
| 419 | if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { |
| 420 | #endif |
| 421 | ctc_pr_warn( |
| 422 | "%s Illegal packet size %d " |
| 423 | "received (MTU=%d blocklen=%d), " |
| 424 | "dropping\n", dev->name, header->length, |
| 425 | dev->mtu, len); |
| 426 | ch->logflags |= LOG_FLAG_ILLEGALSIZE; |
| 427 | #ifndef DEBUG |
| 428 | } |
| 429 | #endif |
| 430 | #ifdef DEBUG |
| 431 | ctc_dump_skb(pskb, -6); |
| 432 | #endif |
| 433 | privptr->stats.rx_dropped++; |
| 434 | privptr->stats.rx_length_errors++; |
| 435 | return; |
| 436 | } |
| 437 | header->length -= LL_HEADER_LENGTH; |
| 438 | len -= LL_HEADER_LENGTH; |
| 439 | if ((header->length > skb_tailroom(pskb)) || |
| 440 | (header->length > len)) { |
| 441 | #ifndef DEBUG |
| 442 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { |
| 443 | #endif |
| 444 | ctc_pr_warn( |
| 445 | "%s Illegal packet size %d " |
| 446 | "(beyond the end of received data), " |
| 447 | "dropping\n", dev->name, header->length); |
| 448 | ch->logflags |= LOG_FLAG_OVERRUN; |
| 449 | #ifndef DEBUG |
| 450 | } |
| 451 | #endif |
| 452 | #ifdef DEBUG |
| 453 | ctc_dump_skb(pskb, -6); |
| 454 | #endif |
| 455 | privptr->stats.rx_dropped++; |
| 456 | privptr->stats.rx_length_errors++; |
| 457 | return; |
| 458 | } |
| 459 | skb_put(pskb, header->length); |
| 460 | pskb->mac.raw = pskb->data; |
| 461 | len -= header->length; |
| 462 | skb = dev_alloc_skb(pskb->len); |
| 463 | if (!skb) { |
| 464 | #ifndef DEBUG |
| 465 | if (!(ch->logflags & LOG_FLAG_NOMEM)) { |
| 466 | #endif |
| 467 | ctc_pr_warn( |
| 468 | "%s Out of memory in ctc_unpack_skb\n", |
| 469 | dev->name); |
| 470 | ch->logflags |= LOG_FLAG_NOMEM; |
| 471 | #ifndef DEBUG |
| 472 | } |
| 473 | #endif |
| 474 | privptr->stats.rx_dropped++; |
| 475 | return; |
| 476 | } |
| 477 | memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len); |
| 478 | skb->mac.raw = skb->data; |
| 479 | skb->dev = pskb->dev; |
| 480 | skb->protocol = pskb->protocol; |
| 481 | pskb->ip_summed = CHECKSUM_UNNECESSARY; |
| 482 | if (ch->protocol == CTC_PROTO_LINUX_TTY) |
| 483 | ctc_tty_netif_rx(skb); |
| 484 | else |
| 485 | netif_rx_ni(skb); |
| 486 | /** |
| 487 | * Successful rx; reset logflags |
| 488 | */ |
| 489 | ch->logflags = 0; |
| 490 | dev->last_rx = jiffies; |
| 491 | privptr->stats.rx_packets++; |
| 492 | privptr->stats.rx_bytes += skb->len; |
| 493 | if (len > 0) { |
| 494 | skb_pull(pskb, header->length); |
| 495 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { |
| 496 | #ifndef DEBUG |
| 497 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { |
| 498 | #endif |
| 499 | ctc_pr_warn( |
| 500 | "%s Overrun in ctc_unpack_skb\n", |
| 501 | dev->name); |
| 502 | ch->logflags |= LOG_FLAG_OVERRUN; |
| 503 | #ifndef DEBUG |
| 504 | } |
| 505 | #endif |
| 506 | return; |
| 507 | } |
| 508 | skb_put(pskb, LL_HEADER_LENGTH); |
| 509 | } |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * Check return code of a preceeding ccw_device call, halt_IO etc... |
| 515 | * |
| 516 | * @param ch The channel, the error belongs to. |
| 517 | * @param return_code The error code to inspect. |
| 518 | */ |
| 519 | static void inline |
| 520 | ccw_check_return_code(struct channel *ch, int return_code, char *msg) |
| 521 | { |
| 522 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 523 | switch (return_code) { |
| 524 | case 0: |
| 525 | fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch); |
| 526 | break; |
| 527 | case -EBUSY: |
| 528 | ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg); |
| 529 | fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch); |
| 530 | break; |
| 531 | case -ENODEV: |
| 532 | ctc_pr_emerg("%s (%s): Invalid device called for IO\n", |
| 533 | ch->id, msg); |
| 534 | fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch); |
| 535 | break; |
| 536 | case -EIO: |
| 537 | ctc_pr_emerg("%s (%s): Status pending... \n", |
| 538 | ch->id, msg); |
| 539 | fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch); |
| 540 | break; |
| 541 | default: |
| 542 | ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n", |
| 543 | ch->id, msg, return_code); |
| 544 | fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch); |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * Check sense of a unit check. |
| 550 | * |
| 551 | * @param ch The channel, the sense code belongs to. |
| 552 | * @param sense The sense code to inspect. |
| 553 | */ |
| 554 | static void inline |
| 555 | ccw_unit_check(struct channel *ch, unsigned char sense) |
| 556 | { |
| 557 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 558 | if (sense & SNS0_INTERVENTION_REQ) { |
| 559 | if (sense & 0x01) { |
| 560 | if (ch->protocol != CTC_PROTO_LINUX_TTY) |
| 561 | ctc_pr_debug("%s: Interface disc. or Sel. reset " |
| 562 | "(remote)\n", ch->id); |
| 563 | fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch); |
| 564 | } else { |
| 565 | ctc_pr_debug("%s: System reset (remote)\n", ch->id); |
| 566 | fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch); |
| 567 | } |
| 568 | } else if (sense & SNS0_EQUIPMENT_CHECK) { |
| 569 | if (sense & SNS0_BUS_OUT_CHECK) { |
| 570 | ctc_pr_warn("%s: Hardware malfunction (remote)\n", |
| 571 | ch->id); |
| 572 | fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch); |
| 573 | } else { |
| 574 | ctc_pr_warn("%s: Read-data parity error (remote)\n", |
| 575 | ch->id); |
| 576 | fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch); |
| 577 | } |
| 578 | } else if (sense & SNS0_BUS_OUT_CHECK) { |
| 579 | if (sense & 0x04) { |
| 580 | ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id); |
| 581 | fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch); |
| 582 | } else { |
| 583 | ctc_pr_warn("%s: Data-transfer parity error\n", ch->id); |
| 584 | fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch); |
| 585 | } |
| 586 | } else if (sense & SNS0_CMD_REJECT) { |
| 587 | ctc_pr_warn("%s: Command reject\n", ch->id); |
| 588 | } else if (sense == 0) { |
| 589 | ctc_pr_debug("%s: Unit check ZERO\n", ch->id); |
| 590 | fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch); |
| 591 | } else { |
| 592 | ctc_pr_warn("%s: Unit Check with sense code: %02x\n", |
| 593 | ch->id, sense); |
| 594 | fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch); |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | static void |
| 599 | ctc_purge_skb_queue(struct sk_buff_head *q) |
| 600 | { |
| 601 | struct sk_buff *skb; |
| 602 | |
| 603 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 604 | |
| 605 | while ((skb = skb_dequeue(q))) { |
| 606 | atomic_dec(&skb->users); |
| 607 | dev_kfree_skb_irq(skb); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | static __inline__ int |
| 612 | ctc_checkalloc_buffer(struct channel *ch, int warn) |
| 613 | { |
| 614 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 615 | if ((ch->trans_skb == NULL) || |
| 616 | (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) { |
| 617 | if (ch->trans_skb != NULL) |
| 618 | dev_kfree_skb(ch->trans_skb); |
| 619 | clear_normalized_cda(&ch->ccw[1]); |
| 620 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, |
| 621 | GFP_ATOMIC | GFP_DMA); |
| 622 | if (ch->trans_skb == NULL) { |
| 623 | if (warn) |
| 624 | ctc_pr_warn( |
| 625 | "%s: Couldn't alloc %s trans_skb\n", |
| 626 | ch->id, |
| 627 | (CHANNEL_DIRECTION(ch->flags) == READ) ? |
| 628 | "RX" : "TX"); |
| 629 | return -ENOMEM; |
| 630 | } |
| 631 | ch->ccw[1].count = ch->max_bufsize; |
| 632 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { |
| 633 | dev_kfree_skb(ch->trans_skb); |
| 634 | ch->trans_skb = NULL; |
| 635 | if (warn) |
| 636 | ctc_pr_warn( |
| 637 | "%s: set_normalized_cda for %s " |
| 638 | "trans_skb failed, dropping packets\n", |
| 639 | ch->id, |
| 640 | (CHANNEL_DIRECTION(ch->flags) == READ) ? |
| 641 | "RX" : "TX"); |
| 642 | return -ENOMEM; |
| 643 | } |
| 644 | ch->ccw[1].count = 0; |
| 645 | ch->trans_skb_data = ch->trans_skb->data; |
| 646 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; |
| 647 | } |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | /** |
| 652 | * Dummy NOP action for statemachines |
| 653 | */ |
| 654 | static void |
| 655 | fsm_action_nop(fsm_instance * fi, int event, void *arg) |
| 656 | { |
| 657 | } |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | /** |
| 660 | * Actions for channel - statemachines. |
| 661 | *****************************************************************************/ |
| 662 | |
| 663 | /** |
| 664 | * Normal data has been send. Free the corresponding |
| 665 | * skb (it's in io_queue), reset dev->tbusy and |
| 666 | * revert to idle state. |
| 667 | * |
| 668 | * @param fi An instance of a channel statemachine. |
| 669 | * @param event The event, just happened. |
| 670 | * @param arg Generic pointer, casted from channel * upon call. |
| 671 | */ |
| 672 | static void |
| 673 | ch_action_txdone(fsm_instance * fi, int event, void *arg) |
| 674 | { |
| 675 | struct channel *ch = (struct channel *) arg; |
| 676 | struct net_device *dev = ch->netdev; |
| 677 | struct ctc_priv *privptr = dev->priv; |
| 678 | struct sk_buff *skb; |
| 679 | int first = 1; |
| 680 | int i; |
| 681 | unsigned long duration; |
| 682 | struct timespec done_stamp = xtime; |
| 683 | |
| 684 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 685 | |
| 686 | duration = |
| 687 | (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 + |
| 688 | (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000; |
| 689 | if (duration > ch->prof.tx_time) |
| 690 | ch->prof.tx_time = duration; |
| 691 | |
| 692 | if (ch->irb->scsw.count != 0) |
| 693 | ctc_pr_debug("%s: TX not complete, remaining %d bytes\n", |
| 694 | dev->name, ch->irb->scsw.count); |
| 695 | fsm_deltimer(&ch->timer); |
| 696 | while ((skb = skb_dequeue(&ch->io_queue))) { |
| 697 | privptr->stats.tx_packets++; |
| 698 | privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; |
| 699 | if (first) { |
| 700 | privptr->stats.tx_bytes += 2; |
| 701 | first = 0; |
| 702 | } |
| 703 | atomic_dec(&skb->users); |
| 704 | dev_kfree_skb_irq(skb); |
| 705 | } |
| 706 | spin_lock(&ch->collect_lock); |
| 707 | clear_normalized_cda(&ch->ccw[4]); |
| 708 | if (ch->collect_len > 0) { |
| 709 | int rc; |
| 710 | |
| 711 | if (ctc_checkalloc_buffer(ch, 1)) { |
| 712 | spin_unlock(&ch->collect_lock); |
| 713 | return; |
| 714 | } |
| 715 | ch->trans_skb->tail = ch->trans_skb->data = ch->trans_skb_data; |
| 716 | ch->trans_skb->len = 0; |
| 717 | if (ch->prof.maxmulti < (ch->collect_len + 2)) |
| 718 | ch->prof.maxmulti = ch->collect_len + 2; |
| 719 | if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) |
| 720 | ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); |
| 721 | *((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; |
| 722 | i = 0; |
| 723 | while ((skb = skb_dequeue(&ch->collect_queue))) { |
| 724 | memcpy(skb_put(ch->trans_skb, skb->len), skb->data, |
| 725 | skb->len); |
| 726 | privptr->stats.tx_packets++; |
| 727 | privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; |
| 728 | atomic_dec(&skb->users); |
| 729 | dev_kfree_skb_irq(skb); |
| 730 | i++; |
| 731 | } |
| 732 | ch->collect_len = 0; |
| 733 | spin_unlock(&ch->collect_lock); |
| 734 | ch->ccw[1].count = ch->trans_skb->len; |
| 735 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 736 | ch->prof.send_stamp = xtime; |
| 737 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], |
| 738 | (unsigned long) ch, 0xff, 0); |
| 739 | ch->prof.doios_multi++; |
| 740 | if (rc != 0) { |
| 741 | privptr->stats.tx_dropped += i; |
| 742 | privptr->stats.tx_errors += i; |
| 743 | fsm_deltimer(&ch->timer); |
| 744 | ccw_check_return_code(ch, rc, "chained TX"); |
| 745 | } |
| 746 | } else { |
| 747 | spin_unlock(&ch->collect_lock); |
| 748 | fsm_newstate(fi, CH_STATE_TXIDLE); |
| 749 | } |
| 750 | ctc_clear_busy(dev); |
| 751 | } |
| 752 | |
| 753 | /** |
| 754 | * Initial data is sent. |
| 755 | * Notify device statemachine that we are up and |
| 756 | * running. |
| 757 | * |
| 758 | * @param fi An instance of a channel statemachine. |
| 759 | * @param event The event, just happened. |
| 760 | * @param arg Generic pointer, casted from channel * upon call. |
| 761 | */ |
| 762 | static void |
| 763 | ch_action_txidle(fsm_instance * fi, int event, void *arg) |
| 764 | { |
| 765 | struct channel *ch = (struct channel *) arg; |
| 766 | |
| 767 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 768 | fsm_deltimer(&ch->timer); |
| 769 | fsm_newstate(fi, CH_STATE_TXIDLE); |
| 770 | fsm_event(((struct ctc_priv *) ch->netdev->priv)->fsm, DEV_EVENT_TXUP, |
| 771 | ch->netdev); |
| 772 | } |
| 773 | |
| 774 | /** |
| 775 | * Got normal data, check for sanity, queue it up, allocate new buffer |
| 776 | * trigger bottom half, and initiate next read. |
| 777 | * |
| 778 | * @param fi An instance of a channel statemachine. |
| 779 | * @param event The event, just happened. |
| 780 | * @param arg Generic pointer, casted from channel * upon call. |
| 781 | */ |
| 782 | static void |
| 783 | ch_action_rx(fsm_instance * fi, int event, void *arg) |
| 784 | { |
| 785 | struct channel *ch = (struct channel *) arg; |
| 786 | struct net_device *dev = ch->netdev; |
| 787 | struct ctc_priv *privptr = dev->priv; |
| 788 | int len = ch->max_bufsize - ch->irb->scsw.count; |
| 789 | struct sk_buff *skb = ch->trans_skb; |
| 790 | __u16 block_len = *((__u16 *) skb->data); |
| 791 | int check_len; |
| 792 | int rc; |
| 793 | |
| 794 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 795 | fsm_deltimer(&ch->timer); |
| 796 | if (len < 8) { |
| 797 | ctc_pr_debug("%s: got packet with length %d < 8\n", |
| 798 | dev->name, len); |
| 799 | privptr->stats.rx_dropped++; |
| 800 | privptr->stats.rx_length_errors++; |
| 801 | goto again; |
| 802 | } |
| 803 | if (len > ch->max_bufsize) { |
| 804 | ctc_pr_debug("%s: got packet with length %d > %d\n", |
| 805 | dev->name, len, ch->max_bufsize); |
| 806 | privptr->stats.rx_dropped++; |
| 807 | privptr->stats.rx_length_errors++; |
| 808 | goto again; |
| 809 | } |
| 810 | |
| 811 | /** |
| 812 | * VM TCP seems to have a bug sending 2 trailing bytes of garbage. |
| 813 | */ |
| 814 | switch (ch->protocol) { |
| 815 | case CTC_PROTO_S390: |
| 816 | case CTC_PROTO_OS390: |
| 817 | check_len = block_len + 2; |
| 818 | break; |
| 819 | default: |
| 820 | check_len = block_len; |
| 821 | break; |
| 822 | } |
| 823 | if ((len < block_len) || (len > check_len)) { |
| 824 | ctc_pr_debug("%s: got block length %d != rx length %d\n", |
| 825 | dev->name, block_len, len); |
| 826 | #ifdef DEBUG |
| 827 | ctc_dump_skb(skb, 0); |
| 828 | #endif |
| 829 | *((__u16 *) skb->data) = len; |
| 830 | privptr->stats.rx_dropped++; |
| 831 | privptr->stats.rx_length_errors++; |
| 832 | goto again; |
| 833 | } |
| 834 | block_len -= 2; |
| 835 | if (block_len > 0) { |
| 836 | *((__u16 *) skb->data) = block_len; |
| 837 | ctc_unpack_skb(ch, skb); |
| 838 | } |
| 839 | again: |
| 840 | skb->data = skb->tail = ch->trans_skb_data; |
| 841 | skb->len = 0; |
| 842 | if (ctc_checkalloc_buffer(ch, 1)) |
| 843 | return; |
| 844 | ch->ccw[1].count = ch->max_bufsize; |
| 845 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); |
| 846 | if (rc != 0) |
| 847 | ccw_check_return_code(ch, rc, "normal RX"); |
| 848 | } |
| 849 | |
| 850 | static void ch_action_rxidle(fsm_instance * fi, int event, void *arg); |
| 851 | |
| 852 | /** |
| 853 | * Initialize connection by sending a __u16 of value 0. |
| 854 | * |
| 855 | * @param fi An instance of a channel statemachine. |
| 856 | * @param event The event, just happened. |
| 857 | * @param arg Generic pointer, casted from channel * upon call. |
| 858 | */ |
| 859 | static void |
| 860 | ch_action_firstio(fsm_instance * fi, int event, void *arg) |
| 861 | { |
| 862 | struct channel *ch = (struct channel *) arg; |
| 863 | int rc; |
| 864 | |
| 865 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 866 | |
| 867 | if (fsm_getstate(fi) == CH_STATE_TXIDLE) |
| 868 | ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id); |
| 869 | fsm_deltimer(&ch->timer); |
| 870 | if (ctc_checkalloc_buffer(ch, 1)) |
| 871 | return; |
| 872 | if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && |
| 873 | (ch->protocol == CTC_PROTO_OS390)) { |
| 874 | /* OS/390 resp. z/OS */ |
| 875 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 876 | *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; |
| 877 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, |
| 878 | CH_EVENT_TIMER, ch); |
| 879 | ch_action_rxidle(fi, event, arg); |
| 880 | } else { |
| 881 | struct net_device *dev = ch->netdev; |
| 882 | fsm_newstate(fi, CH_STATE_TXIDLE); |
| 883 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 884 | DEV_EVENT_TXUP, dev); |
| 885 | } |
| 886 | return; |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * Don´t setup a timer for receiving the initial RX frame |
| 891 | * if in compatibility mode, since VM TCP delays the initial |
| 892 | * frame until it has some data to send. |
| 893 | */ |
| 894 | if ((CHANNEL_DIRECTION(ch->flags) == WRITE) || |
| 895 | (ch->protocol != CTC_PROTO_S390)) |
| 896 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 897 | |
| 898 | *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; |
| 899 | ch->ccw[1].count = 2; /* Transfer only length */ |
| 900 | |
| 901 | fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ) |
| 902 | ? CH_STATE_RXINIT : CH_STATE_TXINIT); |
| 903 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); |
| 904 | if (rc != 0) { |
| 905 | fsm_deltimer(&ch->timer); |
| 906 | fsm_newstate(fi, CH_STATE_SETUPWAIT); |
| 907 | ccw_check_return_code(ch, rc, "init IO"); |
| 908 | } |
| 909 | /** |
| 910 | * If in compatibility mode since we don´t setup a timer, we |
| 911 | * also signal RX channel up immediately. This enables us |
| 912 | * to send packets early which in turn usually triggers some |
| 913 | * reply from VM TCP which brings up the RX channel to it´s |
| 914 | * final state. |
| 915 | */ |
| 916 | if ((CHANNEL_DIRECTION(ch->flags) == READ) && |
| 917 | (ch->protocol == CTC_PROTO_S390)) { |
| 918 | struct net_device *dev = ch->netdev; |
| 919 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP, |
| 920 | dev); |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | /** |
| 925 | * Got initial data, check it. If OK, |
| 926 | * notify device statemachine that we are up and |
| 927 | * running. |
| 928 | * |
| 929 | * @param fi An instance of a channel statemachine. |
| 930 | * @param event The event, just happened. |
| 931 | * @param arg Generic pointer, casted from channel * upon call. |
| 932 | */ |
| 933 | static void |
| 934 | ch_action_rxidle(fsm_instance * fi, int event, void *arg) |
| 935 | { |
| 936 | struct channel *ch = (struct channel *) arg; |
| 937 | struct net_device *dev = ch->netdev; |
| 938 | __u16 buflen; |
| 939 | int rc; |
| 940 | |
| 941 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 942 | fsm_deltimer(&ch->timer); |
| 943 | buflen = *((__u16 *) ch->trans_skb->data); |
| 944 | #ifdef DEBUG |
| 945 | ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen); |
| 946 | #endif |
| 947 | if (buflen >= CTC_INITIAL_BLOCKLEN) { |
| 948 | if (ctc_checkalloc_buffer(ch, 1)) |
| 949 | return; |
| 950 | ch->ccw[1].count = ch->max_bufsize; |
| 951 | fsm_newstate(fi, CH_STATE_RXIDLE); |
| 952 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], |
| 953 | (unsigned long) ch, 0xff, 0); |
| 954 | if (rc != 0) { |
| 955 | fsm_newstate(fi, CH_STATE_RXINIT); |
| 956 | ccw_check_return_code(ch, rc, "initial RX"); |
| 957 | } else |
| 958 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 959 | DEV_EVENT_RXUP, dev); |
| 960 | } else { |
| 961 | ctc_pr_debug("%s: Initial RX count %d not %d\n", |
| 962 | dev->name, buflen, CTC_INITIAL_BLOCKLEN); |
| 963 | ch_action_firstio(fi, event, arg); |
| 964 | } |
| 965 | } |
| 966 | |
| 967 | /** |
| 968 | * Set channel into extended mode. |
| 969 | * |
| 970 | * @param fi An instance of a channel statemachine. |
| 971 | * @param event The event, just happened. |
| 972 | * @param arg Generic pointer, casted from channel * upon call. |
| 973 | */ |
| 974 | static void |
| 975 | ch_action_setmode(fsm_instance * fi, int event, void *arg) |
| 976 | { |
| 977 | struct channel *ch = (struct channel *) arg; |
| 978 | int rc; |
| 979 | unsigned long saveflags; |
| 980 | |
| 981 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 982 | fsm_deltimer(&ch->timer); |
| 983 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 984 | fsm_newstate(fi, CH_STATE_SETUPWAIT); |
| 985 | saveflags = 0; /* avoids compiler warning with |
| 986 | spin_unlock_irqrestore */ |
| 987 | if (event == CH_EVENT_TIMER) // only for timer not yet locked |
| 988 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
| 989 | rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0); |
| 990 | if (event == CH_EVENT_TIMER) |
| 991 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); |
| 992 | if (rc != 0) { |
| 993 | fsm_deltimer(&ch->timer); |
| 994 | fsm_newstate(fi, CH_STATE_STARTWAIT); |
| 995 | ccw_check_return_code(ch, rc, "set Mode"); |
| 996 | } else |
| 997 | ch->retry = 0; |
| 998 | } |
| 999 | |
| 1000 | /** |
| 1001 | * Setup channel. |
| 1002 | * |
| 1003 | * @param fi An instance of a channel statemachine. |
| 1004 | * @param event The event, just happened. |
| 1005 | * @param arg Generic pointer, casted from channel * upon call. |
| 1006 | */ |
| 1007 | static void |
| 1008 | ch_action_start(fsm_instance * fi, int event, void *arg) |
| 1009 | { |
| 1010 | struct channel *ch = (struct channel *) arg; |
| 1011 | unsigned long saveflags; |
| 1012 | int rc; |
| 1013 | struct net_device *dev; |
| 1014 | |
| 1015 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 1016 | if (ch == NULL) { |
| 1017 | ctc_pr_warn("ch_action_start ch=NULL\n"); |
| 1018 | return; |
| 1019 | } |
| 1020 | if (ch->netdev == NULL) { |
| 1021 | ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id); |
| 1022 | return; |
| 1023 | } |
| 1024 | dev = ch->netdev; |
| 1025 | |
| 1026 | #ifdef DEBUG |
| 1027 | ctc_pr_debug("%s: %s channel start\n", dev->name, |
| 1028 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
| 1029 | #endif |
| 1030 | |
| 1031 | if (ch->trans_skb != NULL) { |
| 1032 | clear_normalized_cda(&ch->ccw[1]); |
| 1033 | dev_kfree_skb(ch->trans_skb); |
| 1034 | ch->trans_skb = NULL; |
| 1035 | } |
| 1036 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1037 | ch->ccw[1].cmd_code = CCW_CMD_READ; |
| 1038 | ch->ccw[1].flags = CCW_FLAG_SLI; |
| 1039 | ch->ccw[1].count = 0; |
| 1040 | } else { |
| 1041 | ch->ccw[1].cmd_code = CCW_CMD_WRITE; |
| 1042 | ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
| 1043 | ch->ccw[1].count = 0; |
| 1044 | } |
| 1045 | if (ctc_checkalloc_buffer(ch, 0)) { |
| 1046 | ctc_pr_notice( |
| 1047 | "%s: Could not allocate %s trans_skb, delaying " |
| 1048 | "allocation until first transfer\n", |
| 1049 | dev->name, |
| 1050 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
| 1051 | } |
| 1052 | |
| 1053 | ch->ccw[0].cmd_code = CCW_CMD_PREPARE; |
| 1054 | ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; |
| 1055 | ch->ccw[0].count = 0; |
| 1056 | ch->ccw[0].cda = 0; |
| 1057 | ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ |
| 1058 | ch->ccw[2].flags = CCW_FLAG_SLI; |
| 1059 | ch->ccw[2].count = 0; |
| 1060 | ch->ccw[2].cda = 0; |
| 1061 | memcpy(&ch->ccw[3], &ch->ccw[0], sizeof (struct ccw1) * 3); |
| 1062 | ch->ccw[4].cda = 0; |
| 1063 | ch->ccw[4].flags &= ~CCW_FLAG_IDA; |
| 1064 | |
| 1065 | fsm_newstate(fi, CH_STATE_STARTWAIT); |
| 1066 | fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); |
| 1067 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
| 1068 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); |
| 1069 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); |
| 1070 | if (rc != 0) { |
| 1071 | if (rc != -EBUSY) |
| 1072 | fsm_deltimer(&ch->timer); |
| 1073 | ccw_check_return_code(ch, rc, "initial HaltIO"); |
| 1074 | } |
| 1075 | #ifdef DEBUG |
| 1076 | ctc_pr_debug("ctc: %s(): leaving\n", __func__); |
| 1077 | #endif |
| 1078 | } |
| 1079 | |
| 1080 | /** |
| 1081 | * Shutdown a channel. |
| 1082 | * |
| 1083 | * @param fi An instance of a channel statemachine. |
| 1084 | * @param event The event, just happened. |
| 1085 | * @param arg Generic pointer, casted from channel * upon call. |
| 1086 | */ |
| 1087 | static void |
| 1088 | ch_action_haltio(fsm_instance * fi, int event, void *arg) |
| 1089 | { |
| 1090 | struct channel *ch = (struct channel *) arg; |
| 1091 | unsigned long saveflags; |
| 1092 | int rc; |
| 1093 | int oldstate; |
| 1094 | |
| 1095 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1096 | fsm_deltimer(&ch->timer); |
| 1097 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 1098 | saveflags = 0; /* avoids comp warning with |
| 1099 | spin_unlock_irqrestore */ |
| 1100 | if (event == CH_EVENT_STOP) // only for STOP not yet locked |
| 1101 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
| 1102 | oldstate = fsm_getstate(fi); |
| 1103 | fsm_newstate(fi, CH_STATE_TERM); |
| 1104 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); |
| 1105 | if (event == CH_EVENT_STOP) |
| 1106 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); |
| 1107 | if (rc != 0) { |
| 1108 | if (rc != -EBUSY) { |
| 1109 | fsm_deltimer(&ch->timer); |
| 1110 | fsm_newstate(fi, oldstate); |
| 1111 | } |
| 1112 | ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio"); |
| 1113 | } |
| 1114 | } |
| 1115 | |
| 1116 | /** |
| 1117 | * A channel has successfully been halted. |
| 1118 | * Cleanup it's queue and notify interface statemachine. |
| 1119 | * |
| 1120 | * @param fi An instance of a channel statemachine. |
| 1121 | * @param event The event, just happened. |
| 1122 | * @param arg Generic pointer, casted from channel * upon call. |
| 1123 | */ |
| 1124 | static void |
| 1125 | ch_action_stopped(fsm_instance * fi, int event, void *arg) |
| 1126 | { |
| 1127 | struct channel *ch = (struct channel *) arg; |
| 1128 | struct net_device *dev = ch->netdev; |
| 1129 | |
| 1130 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1131 | fsm_deltimer(&ch->timer); |
| 1132 | fsm_newstate(fi, CH_STATE_STOPPED); |
| 1133 | if (ch->trans_skb != NULL) { |
| 1134 | clear_normalized_cda(&ch->ccw[1]); |
| 1135 | dev_kfree_skb(ch->trans_skb); |
| 1136 | ch->trans_skb = NULL; |
| 1137 | } |
| 1138 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1139 | skb_queue_purge(&ch->io_queue); |
| 1140 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1141 | DEV_EVENT_RXDOWN, dev); |
| 1142 | } else { |
| 1143 | ctc_purge_skb_queue(&ch->io_queue); |
| 1144 | spin_lock(&ch->collect_lock); |
| 1145 | ctc_purge_skb_queue(&ch->collect_queue); |
| 1146 | ch->collect_len = 0; |
| 1147 | spin_unlock(&ch->collect_lock); |
| 1148 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1149 | DEV_EVENT_TXDOWN, dev); |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | /** |
| 1154 | * A stop command from device statemachine arrived and we are in |
| 1155 | * not operational mode. Set state to stopped. |
| 1156 | * |
| 1157 | * @param fi An instance of a channel statemachine. |
| 1158 | * @param event The event, just happened. |
| 1159 | * @param arg Generic pointer, casted from channel * upon call. |
| 1160 | */ |
| 1161 | static void |
| 1162 | ch_action_stop(fsm_instance * fi, int event, void *arg) |
| 1163 | { |
| 1164 | fsm_newstate(fi, CH_STATE_STOPPED); |
| 1165 | } |
| 1166 | |
| 1167 | /** |
| 1168 | * A machine check for no path, not operational status or gone device has |
| 1169 | * happened. |
| 1170 | * Cleanup queue and notify interface statemachine. |
| 1171 | * |
| 1172 | * @param fi An instance of a channel statemachine. |
| 1173 | * @param event The event, just happened. |
| 1174 | * @param arg Generic pointer, casted from channel * upon call. |
| 1175 | */ |
| 1176 | static void |
| 1177 | ch_action_fail(fsm_instance * fi, int event, void *arg) |
| 1178 | { |
| 1179 | struct channel *ch = (struct channel *) arg; |
| 1180 | struct net_device *dev = ch->netdev; |
| 1181 | |
| 1182 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1183 | fsm_deltimer(&ch->timer); |
| 1184 | fsm_newstate(fi, CH_STATE_NOTOP); |
| 1185 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1186 | skb_queue_purge(&ch->io_queue); |
| 1187 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1188 | DEV_EVENT_RXDOWN, dev); |
| 1189 | } else { |
| 1190 | ctc_purge_skb_queue(&ch->io_queue); |
| 1191 | spin_lock(&ch->collect_lock); |
| 1192 | ctc_purge_skb_queue(&ch->collect_queue); |
| 1193 | ch->collect_len = 0; |
| 1194 | spin_unlock(&ch->collect_lock); |
| 1195 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1196 | DEV_EVENT_TXDOWN, dev); |
| 1197 | } |
| 1198 | } |
| 1199 | |
| 1200 | /** |
| 1201 | * Handle error during setup of channel. |
| 1202 | * |
| 1203 | * @param fi An instance of a channel statemachine. |
| 1204 | * @param event The event, just happened. |
| 1205 | * @param arg Generic pointer, casted from channel * upon call. |
| 1206 | */ |
| 1207 | static void |
| 1208 | ch_action_setuperr(fsm_instance * fi, int event, void *arg) |
| 1209 | { |
| 1210 | struct channel *ch = (struct channel *) arg; |
| 1211 | struct net_device *dev = ch->netdev; |
| 1212 | |
| 1213 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 1214 | /** |
| 1215 | * Special case: Got UC_RCRESET on setmode. |
| 1216 | * This means that remote side isn't setup. In this case |
| 1217 | * simply retry after some 10 secs... |
| 1218 | */ |
| 1219 | if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && |
| 1220 | ((event == CH_EVENT_UC_RCRESET) || |
| 1221 | (event == CH_EVENT_UC_RSRESET))) { |
| 1222 | fsm_newstate(fi, CH_STATE_STARTRETRY); |
| 1223 | fsm_deltimer(&ch->timer); |
| 1224 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 1225 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1226 | int rc = ccw_device_halt(ch->cdev, (unsigned long) ch); |
| 1227 | if (rc != 0) |
| 1228 | ccw_check_return_code( |
| 1229 | ch, rc, "HaltIO in ch_action_setuperr"); |
| 1230 | } |
| 1231 | return; |
| 1232 | } |
| 1233 | |
| 1234 | ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n", |
| 1235 | dev->name, ch_event_names[event], |
| 1236 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX", |
| 1237 | fsm_getstate_str(fi)); |
| 1238 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1239 | fsm_newstate(fi, CH_STATE_RXERR); |
| 1240 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1241 | DEV_EVENT_RXDOWN, dev); |
| 1242 | } else { |
| 1243 | fsm_newstate(fi, CH_STATE_TXERR); |
| 1244 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1245 | DEV_EVENT_TXDOWN, dev); |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | /** |
| 1250 | * Restart a channel after an error. |
| 1251 | * |
| 1252 | * @param fi An instance of a channel statemachine. |
| 1253 | * @param event The event, just happened. |
| 1254 | * @param arg Generic pointer, casted from channel * upon call. |
| 1255 | */ |
| 1256 | static void |
| 1257 | ch_action_restart(fsm_instance * fi, int event, void *arg) |
| 1258 | { |
| 1259 | unsigned long saveflags; |
| 1260 | int oldstate; |
| 1261 | int rc; |
| 1262 | |
| 1263 | struct channel *ch = (struct channel *) arg; |
| 1264 | struct net_device *dev = ch->netdev; |
| 1265 | |
| 1266 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1267 | fsm_deltimer(&ch->timer); |
| 1268 | ctc_pr_debug("%s: %s channel restart\n", dev->name, |
| 1269 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
| 1270 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 1271 | oldstate = fsm_getstate(fi); |
| 1272 | fsm_newstate(fi, CH_STATE_STARTWAIT); |
| 1273 | saveflags = 0; /* avoids compiler warning with |
| 1274 | spin_unlock_irqrestore */ |
| 1275 | if (event == CH_EVENT_TIMER) // only for timer not yet locked |
| 1276 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
| 1277 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); |
| 1278 | if (event == CH_EVENT_TIMER) |
| 1279 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); |
| 1280 | if (rc != 0) { |
| 1281 | if (rc != -EBUSY) { |
| 1282 | fsm_deltimer(&ch->timer); |
| 1283 | fsm_newstate(fi, oldstate); |
| 1284 | } |
| 1285 | ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart"); |
| 1286 | } |
| 1287 | } |
| 1288 | |
| 1289 | /** |
| 1290 | * Handle error during RX initial handshake (exchange of |
| 1291 | * 0-length block header) |
| 1292 | * |
| 1293 | * @param fi An instance of a channel statemachine. |
| 1294 | * @param event The event, just happened. |
| 1295 | * @param arg Generic pointer, casted from channel * upon call. |
| 1296 | */ |
| 1297 | static void |
| 1298 | ch_action_rxiniterr(fsm_instance * fi, int event, void *arg) |
| 1299 | { |
| 1300 | struct channel *ch = (struct channel *) arg; |
| 1301 | struct net_device *dev = ch->netdev; |
| 1302 | |
| 1303 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 1304 | if (event == CH_EVENT_TIMER) { |
| 1305 | fsm_deltimer(&ch->timer); |
| 1306 | ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name); |
| 1307 | if (ch->retry++ < 3) |
| 1308 | ch_action_restart(fi, event, arg); |
| 1309 | else { |
| 1310 | fsm_newstate(fi, CH_STATE_RXERR); |
| 1311 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1312 | DEV_EVENT_RXDOWN, dev); |
| 1313 | } |
| 1314 | } else |
| 1315 | ctc_pr_warn("%s: Error during RX init handshake\n", dev->name); |
| 1316 | } |
| 1317 | |
| 1318 | /** |
| 1319 | * Notify device statemachine if we gave up initialization |
| 1320 | * of RX channel. |
| 1321 | * |
| 1322 | * @param fi An instance of a channel statemachine. |
| 1323 | * @param event The event, just happened. |
| 1324 | * @param arg Generic pointer, casted from channel * upon call. |
| 1325 | */ |
| 1326 | static void |
| 1327 | ch_action_rxinitfail(fsm_instance * fi, int event, void *arg) |
| 1328 | { |
| 1329 | struct channel *ch = (struct channel *) arg; |
| 1330 | struct net_device *dev = ch->netdev; |
| 1331 | |
| 1332 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 1333 | fsm_newstate(fi, CH_STATE_RXERR); |
| 1334 | ctc_pr_warn("%s: RX initialization failed\n", dev->name); |
| 1335 | ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name); |
| 1336 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); |
| 1337 | } |
| 1338 | |
| 1339 | /** |
| 1340 | * Handle RX Unit check remote reset (remote disconnected) |
| 1341 | * |
| 1342 | * @param fi An instance of a channel statemachine. |
| 1343 | * @param event The event, just happened. |
| 1344 | * @param arg Generic pointer, casted from channel * upon call. |
| 1345 | */ |
| 1346 | static void |
| 1347 | ch_action_rxdisc(fsm_instance * fi, int event, void *arg) |
| 1348 | { |
| 1349 | struct channel *ch = (struct channel *) arg; |
| 1350 | struct channel *ch2; |
| 1351 | struct net_device *dev = ch->netdev; |
| 1352 | |
| 1353 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1354 | fsm_deltimer(&ch->timer); |
| 1355 | ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n", |
| 1356 | dev->name); |
| 1357 | |
| 1358 | /** |
| 1359 | * Notify device statemachine |
| 1360 | */ |
| 1361 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); |
| 1362 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); |
| 1363 | |
| 1364 | fsm_newstate(fi, CH_STATE_DTERM); |
| 1365 | ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE]; |
| 1366 | fsm_newstate(ch2->fsm, CH_STATE_DTERM); |
| 1367 | |
| 1368 | ccw_device_halt(ch->cdev, (unsigned long) ch); |
| 1369 | ccw_device_halt(ch2->cdev, (unsigned long) ch2); |
| 1370 | } |
| 1371 | |
| 1372 | /** |
| 1373 | * Handle error during TX channel initialization. |
| 1374 | * |
| 1375 | * @param fi An instance of a channel statemachine. |
| 1376 | * @param event The event, just happened. |
| 1377 | * @param arg Generic pointer, casted from channel * upon call. |
| 1378 | */ |
| 1379 | static void |
| 1380 | ch_action_txiniterr(fsm_instance * fi, int event, void *arg) |
| 1381 | { |
| 1382 | struct channel *ch = (struct channel *) arg; |
| 1383 | struct net_device *dev = ch->netdev; |
| 1384 | |
| 1385 | DBF_TEXT(setup, 2, __FUNCTION__); |
| 1386 | if (event == CH_EVENT_TIMER) { |
| 1387 | fsm_deltimer(&ch->timer); |
| 1388 | ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name); |
| 1389 | if (ch->retry++ < 3) |
| 1390 | ch_action_restart(fi, event, arg); |
| 1391 | else { |
| 1392 | fsm_newstate(fi, CH_STATE_TXERR); |
| 1393 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1394 | DEV_EVENT_TXDOWN, dev); |
| 1395 | } |
| 1396 | } else |
| 1397 | ctc_pr_warn("%s: Error during TX init handshake\n", dev->name); |
| 1398 | } |
| 1399 | |
| 1400 | /** |
| 1401 | * Handle TX timeout by retrying operation. |
| 1402 | * |
| 1403 | * @param fi An instance of a channel statemachine. |
| 1404 | * @param event The event, just happened. |
| 1405 | * @param arg Generic pointer, casted from channel * upon call. |
| 1406 | */ |
| 1407 | static void |
| 1408 | ch_action_txretry(fsm_instance * fi, int event, void *arg) |
| 1409 | { |
| 1410 | struct channel *ch = (struct channel *) arg; |
| 1411 | struct net_device *dev = ch->netdev; |
| 1412 | unsigned long saveflags; |
| 1413 | |
| 1414 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 1415 | fsm_deltimer(&ch->timer); |
| 1416 | if (ch->retry++ > 3) { |
| 1417 | ctc_pr_debug("%s: TX retry failed, restarting channel\n", |
| 1418 | dev->name); |
| 1419 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1420 | DEV_EVENT_TXDOWN, dev); |
| 1421 | ch_action_restart(fi, event, arg); |
| 1422 | } else { |
| 1423 | struct sk_buff *skb; |
| 1424 | |
| 1425 | ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry); |
| 1426 | if ((skb = skb_peek(&ch->io_queue))) { |
| 1427 | int rc = 0; |
| 1428 | |
| 1429 | clear_normalized_cda(&ch->ccw[4]); |
| 1430 | ch->ccw[4].count = skb->len; |
| 1431 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { |
| 1432 | ctc_pr_debug( |
| 1433 | "%s: IDAL alloc failed, chan restart\n", |
| 1434 | dev->name); |
| 1435 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1436 | DEV_EVENT_TXDOWN, dev); |
| 1437 | ch_action_restart(fi, event, arg); |
| 1438 | return; |
| 1439 | } |
| 1440 | fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); |
| 1441 | saveflags = 0; /* avoids compiler warning with |
| 1442 | spin_unlock_irqrestore */ |
| 1443 | if (event == CH_EVENT_TIMER) // only for TIMER not yet locked |
| 1444 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), |
| 1445 | saveflags); |
| 1446 | rc = ccw_device_start(ch->cdev, &ch->ccw[3], |
| 1447 | (unsigned long) ch, 0xff, 0); |
| 1448 | if (event == CH_EVENT_TIMER) |
| 1449 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), |
| 1450 | saveflags); |
| 1451 | if (rc != 0) { |
| 1452 | fsm_deltimer(&ch->timer); |
| 1453 | ccw_check_return_code(ch, rc, "TX in ch_action_txretry"); |
| 1454 | ctc_purge_skb_queue(&ch->io_queue); |
| 1455 | } |
| 1456 | } |
| 1457 | } |
| 1458 | |
| 1459 | } |
| 1460 | |
| 1461 | /** |
| 1462 | * Handle fatal errors during an I/O command. |
| 1463 | * |
| 1464 | * @param fi An instance of a channel statemachine. |
| 1465 | * @param event The event, just happened. |
| 1466 | * @param arg Generic pointer, casted from channel * upon call. |
| 1467 | */ |
| 1468 | static void |
| 1469 | ch_action_iofatal(fsm_instance * fi, int event, void *arg) |
| 1470 | { |
| 1471 | struct channel *ch = (struct channel *) arg; |
| 1472 | struct net_device *dev = ch->netdev; |
| 1473 | |
| 1474 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1475 | fsm_deltimer(&ch->timer); |
| 1476 | if (CHANNEL_DIRECTION(ch->flags) == READ) { |
| 1477 | ctc_pr_debug("%s: RX I/O error\n", dev->name); |
| 1478 | fsm_newstate(fi, CH_STATE_RXERR); |
| 1479 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1480 | DEV_EVENT_RXDOWN, dev); |
| 1481 | } else { |
| 1482 | ctc_pr_debug("%s: TX I/O error\n", dev->name); |
| 1483 | fsm_newstate(fi, CH_STATE_TXERR); |
| 1484 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, |
| 1485 | DEV_EVENT_TXDOWN, dev); |
| 1486 | } |
| 1487 | } |
| 1488 | |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 1489 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | ch_action_reinit(fsm_instance *fi, int event, void *arg) |
| 1491 | { |
| 1492 | struct channel *ch = (struct channel *)arg; |
| 1493 | struct net_device *dev = ch->netdev; |
| 1494 | struct ctc_priv *privptr = dev->priv; |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 1495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 1497 | ch_action_iofatal(fi, event, arg); |
| 1498 | fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev); |
| 1499 | } |
| 1500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | /** |
| 1502 | * The statemachine for a channel. |
| 1503 | */ |
| 1504 | static const fsm_node ch_fsm[] = { |
| 1505 | {CH_STATE_STOPPED, CH_EVENT_STOP, fsm_action_nop }, |
| 1506 | {CH_STATE_STOPPED, CH_EVENT_START, ch_action_start }, |
| 1507 | {CH_STATE_STOPPED, CH_EVENT_FINSTAT, fsm_action_nop }, |
| 1508 | {CH_STATE_STOPPED, CH_EVENT_MC_FAIL, fsm_action_nop }, |
| 1509 | |
| 1510 | {CH_STATE_NOTOP, CH_EVENT_STOP, ch_action_stop }, |
| 1511 | {CH_STATE_NOTOP, CH_EVENT_START, fsm_action_nop }, |
| 1512 | {CH_STATE_NOTOP, CH_EVENT_FINSTAT, fsm_action_nop }, |
| 1513 | {CH_STATE_NOTOP, CH_EVENT_MC_FAIL, fsm_action_nop }, |
| 1514 | {CH_STATE_NOTOP, CH_EVENT_MC_GOOD, ch_action_start }, |
| 1515 | |
| 1516 | {CH_STATE_STARTWAIT, CH_EVENT_STOP, ch_action_haltio }, |
| 1517 | {CH_STATE_STARTWAIT, CH_EVENT_START, fsm_action_nop }, |
| 1518 | {CH_STATE_STARTWAIT, CH_EVENT_FINSTAT, ch_action_setmode }, |
| 1519 | {CH_STATE_STARTWAIT, CH_EVENT_TIMER, ch_action_setuperr }, |
| 1520 | {CH_STATE_STARTWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1521 | {CH_STATE_STARTWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1522 | {CH_STATE_STARTWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1523 | |
| 1524 | {CH_STATE_STARTRETRY, CH_EVENT_STOP, ch_action_haltio }, |
| 1525 | {CH_STATE_STARTRETRY, CH_EVENT_TIMER, ch_action_setmode }, |
| 1526 | {CH_STATE_STARTRETRY, CH_EVENT_FINSTAT, fsm_action_nop }, |
| 1527 | {CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1528 | |
| 1529 | {CH_STATE_SETUPWAIT, CH_EVENT_STOP, ch_action_haltio }, |
| 1530 | {CH_STATE_SETUPWAIT, CH_EVENT_START, fsm_action_nop }, |
| 1531 | {CH_STATE_SETUPWAIT, CH_EVENT_FINSTAT, ch_action_firstio }, |
| 1532 | {CH_STATE_SETUPWAIT, CH_EVENT_UC_RCRESET, ch_action_setuperr }, |
| 1533 | {CH_STATE_SETUPWAIT, CH_EVENT_UC_RSRESET, ch_action_setuperr }, |
| 1534 | {CH_STATE_SETUPWAIT, CH_EVENT_TIMER, ch_action_setmode }, |
| 1535 | {CH_STATE_SETUPWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1536 | {CH_STATE_SETUPWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1537 | {CH_STATE_SETUPWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1538 | |
| 1539 | {CH_STATE_RXINIT, CH_EVENT_STOP, ch_action_haltio }, |
| 1540 | {CH_STATE_RXINIT, CH_EVENT_START, fsm_action_nop }, |
| 1541 | {CH_STATE_RXINIT, CH_EVENT_FINSTAT, ch_action_rxidle }, |
| 1542 | {CH_STATE_RXINIT, CH_EVENT_UC_RCRESET, ch_action_rxiniterr }, |
| 1543 | {CH_STATE_RXINIT, CH_EVENT_UC_RSRESET, ch_action_rxiniterr }, |
| 1544 | {CH_STATE_RXINIT, CH_EVENT_TIMER, ch_action_rxiniterr }, |
| 1545 | {CH_STATE_RXINIT, CH_EVENT_ATTNBUSY, ch_action_rxinitfail }, |
| 1546 | {CH_STATE_RXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1547 | {CH_STATE_RXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1548 | {CH_STATE_RXINIT, CH_EVENT_UC_ZERO, ch_action_firstio }, |
| 1549 | {CH_STATE_RXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1550 | |
| 1551 | {CH_STATE_RXIDLE, CH_EVENT_STOP, ch_action_haltio }, |
| 1552 | {CH_STATE_RXIDLE, CH_EVENT_START, fsm_action_nop }, |
| 1553 | {CH_STATE_RXIDLE, CH_EVENT_FINSTAT, ch_action_rx }, |
| 1554 | {CH_STATE_RXIDLE, CH_EVENT_UC_RCRESET, ch_action_rxdisc }, |
| 1555 | // {CH_STATE_RXIDLE, CH_EVENT_UC_RSRESET, ch_action_rxretry }, |
| 1556 | {CH_STATE_RXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1557 | {CH_STATE_RXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1558 | {CH_STATE_RXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1559 | {CH_STATE_RXIDLE, CH_EVENT_UC_ZERO, ch_action_rx }, |
| 1560 | |
| 1561 | {CH_STATE_TXINIT, CH_EVENT_STOP, ch_action_haltio }, |
| 1562 | {CH_STATE_TXINIT, CH_EVENT_START, fsm_action_nop }, |
| 1563 | {CH_STATE_TXINIT, CH_EVENT_FINSTAT, ch_action_txidle }, |
| 1564 | {CH_STATE_TXINIT, CH_EVENT_UC_RCRESET, ch_action_txiniterr }, |
| 1565 | {CH_STATE_TXINIT, CH_EVENT_UC_RSRESET, ch_action_txiniterr }, |
| 1566 | {CH_STATE_TXINIT, CH_EVENT_TIMER, ch_action_txiniterr }, |
| 1567 | {CH_STATE_TXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1568 | {CH_STATE_TXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1569 | {CH_STATE_TXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1570 | |
| 1571 | {CH_STATE_TXIDLE, CH_EVENT_STOP, ch_action_haltio }, |
| 1572 | {CH_STATE_TXIDLE, CH_EVENT_START, fsm_action_nop }, |
| 1573 | {CH_STATE_TXIDLE, CH_EVENT_FINSTAT, ch_action_firstio }, |
| 1574 | {CH_STATE_TXIDLE, CH_EVENT_UC_RCRESET, fsm_action_nop }, |
| 1575 | {CH_STATE_TXIDLE, CH_EVENT_UC_RSRESET, fsm_action_nop }, |
| 1576 | {CH_STATE_TXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1577 | {CH_STATE_TXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1578 | {CH_STATE_TXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1579 | |
| 1580 | {CH_STATE_TERM, CH_EVENT_STOP, fsm_action_nop }, |
| 1581 | {CH_STATE_TERM, CH_EVENT_START, ch_action_restart }, |
| 1582 | {CH_STATE_TERM, CH_EVENT_FINSTAT, ch_action_stopped }, |
| 1583 | {CH_STATE_TERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, |
| 1584 | {CH_STATE_TERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, |
| 1585 | {CH_STATE_TERM, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1586 | |
| 1587 | {CH_STATE_DTERM, CH_EVENT_STOP, ch_action_haltio }, |
| 1588 | {CH_STATE_DTERM, CH_EVENT_START, ch_action_restart }, |
| 1589 | {CH_STATE_DTERM, CH_EVENT_FINSTAT, ch_action_setmode }, |
| 1590 | {CH_STATE_DTERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, |
| 1591 | {CH_STATE_DTERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, |
| 1592 | {CH_STATE_DTERM, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1593 | |
| 1594 | {CH_STATE_TX, CH_EVENT_STOP, ch_action_haltio }, |
| 1595 | {CH_STATE_TX, CH_EVENT_START, fsm_action_nop }, |
| 1596 | {CH_STATE_TX, CH_EVENT_FINSTAT, ch_action_txdone }, |
| 1597 | {CH_STATE_TX, CH_EVENT_UC_RCRESET, ch_action_txretry }, |
| 1598 | {CH_STATE_TX, CH_EVENT_UC_RSRESET, ch_action_txretry }, |
| 1599 | {CH_STATE_TX, CH_EVENT_TIMER, ch_action_txretry }, |
| 1600 | {CH_STATE_TX, CH_EVENT_IO_ENODEV, ch_action_iofatal }, |
| 1601 | {CH_STATE_TX, CH_EVENT_IO_EIO, ch_action_reinit }, |
| 1602 | {CH_STATE_TX, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1603 | |
| 1604 | {CH_STATE_RXERR, CH_EVENT_STOP, ch_action_haltio }, |
| 1605 | {CH_STATE_TXERR, CH_EVENT_STOP, ch_action_haltio }, |
| 1606 | {CH_STATE_TXERR, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1607 | {CH_STATE_RXERR, CH_EVENT_MC_FAIL, ch_action_fail }, |
| 1608 | }; |
| 1609 | |
| 1610 | static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node); |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 1611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | /** |
| 1613 | * Functions related to setup and device detection. |
| 1614 | *****************************************************************************/ |
| 1615 | |
| 1616 | static inline int |
| 1617 | less_than(char *id1, char *id2) |
| 1618 | { |
| 1619 | int dev1, dev2, i; |
| 1620 | |
| 1621 | for (i = 0; i < 5; i++) { |
| 1622 | id1++; |
| 1623 | id2++; |
| 1624 | } |
| 1625 | dev1 = simple_strtoul(id1, &id1, 16); |
| 1626 | dev2 = simple_strtoul(id2, &id2, 16); |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 1627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | return (dev1 < dev2); |
| 1629 | } |
| 1630 | |
| 1631 | /** |
| 1632 | * Add a new channel to the list of channels. |
| 1633 | * Keeps the channel list sorted. |
| 1634 | * |
| 1635 | * @param cdev The ccw_device to be added. |
| 1636 | * @param type The type class of the new channel. |
| 1637 | * |
| 1638 | * @return 0 on success, !0 on error. |
| 1639 | */ |
| 1640 | static int |
| 1641 | add_channel(struct ccw_device *cdev, enum channel_types type) |
| 1642 | { |
| 1643 | struct channel **c = &channels; |
| 1644 | struct channel *ch; |
| 1645 | |
| 1646 | DBF_TEXT(trace, 2, __FUNCTION__); |
| 1647 | if ((ch = |
| 1648 | (struct channel *) kmalloc(sizeof (struct channel), |
| 1649 | GFP_KERNEL)) == NULL) { |
| 1650 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); |
| 1651 | return -1; |
| 1652 | } |
| 1653 | memset(ch, 0, sizeof (struct channel)); |
| 1654 | if ((ch->ccw = (struct ccw1 *) kmalloc(8*sizeof(struct ccw1), |
| 1655 | GFP_KERNEL | GFP_DMA)) == NULL) { |
| 1656 | kfree(ch); |
| 1657 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); |
| 1658 | return -1; |
| 1659 | } |
| 1660 | |
| 1661 | memset(ch->ccw, 0, 8*sizeof(struct ccw1)); // assure all flags and counters are reset |
| 1662 | |
| 1663 | /** |
| 1664 | * "static" ccws are used in the following way: |
| 1665 | * |
| 1666 | * ccw[0..2] (Channel program for generic I/O): |
| 1667 | * 0: prepare |
| 1668 | * 1: read or write (depending on direction) with fixed |
| 1669 | * buffer (idal allocated once when buffer is allocated) |
| 1670 | * 2: nop |
| 1671 | * ccw[3..5] (Channel program for direct write of packets) |
| 1672 | * 3: prepare |
| 1673 | * 4: write (idal allocated on every write). |
| 1674 | * 5: nop |
| 1675 | * ccw[6..7] (Channel program for initial channel setup): |
| 1676 | * 6: set extended mode |
| 1677 | * 7: nop |
| 1678 | * |
| 1679 | * ch->ccw[0..5] are initialized in ch_action_start because |
| 1680 | * the channel's direction is yet unknown here. |
| 1681 | */ |
| 1682 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; |
| 1683 | ch->ccw[6].flags = CCW_FLAG_SLI; |
| 1684 | |
| 1685 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; |
| 1686 | ch->ccw[7].flags = CCW_FLAG_SLI; |
| 1687 | |
| 1688 | ch->cdev = cdev; |
| 1689 | snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id); |
| 1690 | ch->type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | ch->fsm = init_fsm(ch->id, ch_state_names, |
| 1692 | ch_event_names, NR_CH_STATES, NR_CH_EVENTS, |
| 1693 | ch_fsm, CH_FSM_LEN, GFP_KERNEL); |
| 1694 | if (ch->fsm == NULL) { |
| 1695 | ctc_pr_warn("ctc: Could not create FSM in add_channel\n"); |
| 1696 | kfree(ch->ccw); |
| 1697 | kfree(ch); |
| 1698 | return -1; |
| 1699 | } |
| 1700 | fsm_newstate(ch->fsm, CH_STATE_IDLE); |
| 1701 | if ((ch->irb = (struct irb *) kmalloc(sizeof (struct irb), |
| 1702 | GFP_KERNEL)) == NULL) { |
| 1703 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); |
| 1704 | kfree_fsm(ch->fsm); |
| 1705 | kfree(ch->ccw); |
| 1706 | kfree(ch); |
| 1707 | return -1; |
| 1708 | } |
| 1709 | memset(ch->irb, 0, sizeof (struct irb)); |
| 1710 | while (*c && less_than((*c)->id, ch->id)) |
| 1711 | c = &(*c)->next; |
| 1712 | if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) { |
| 1713 | ctc_pr_debug( |
| 1714 | "ctc: add_channel: device %s already in list, " |
| 1715 | "using old entry\n", (*c)->id); |
| 1716 | kfree(ch->irb); |
| 1717 | kfree_fsm(ch->fsm); |
| 1718 | kfree(ch->ccw); |
| 1719 | kfree(ch); |
| 1720 | return 0; |
| 1721 | } |
| 1722 | fsm_settimer(ch->fsm, &ch->timer); |
| 1723 | skb_queue_head_init(&ch->io_queue); |
| 1724 | skb_queue_head_init(&ch->collect_queue); |
| 1725 | ch->next = *c; |
| 1726 | *c = ch; |
| 1727 | return 0; |
| 1728 | } |
| 1729 | |
| 1730 | /** |
| 1731 | * Release a specific channel in the channel list. |
| 1732 | * |
| 1733 | * @param ch Pointer to channel struct to be released. |
| 1734 | */ |
| 1735 | static void |
| 1736 | channel_free(struct channel *ch) |
| 1737 | { |
| 1738 | ch->flags &= ~CHANNEL_FLAGS_INUSE; |
| 1739 | fsm_newstate(ch->fsm, CH_STATE_IDLE); |
| 1740 | } |
| 1741 | |
| 1742 | /** |
| 1743 | * Remove a specific channel in the channel list. |
| 1744 | * |
| 1745 | * @param ch Pointer to channel struct to be released. |
| 1746 | */ |
| 1747 | static void |
| 1748 | channel_remove(struct channel *ch) |
| 1749 | { |
| 1750 | struct channel **c = &channels; |
| 1751 | |
| 1752 | DBF_TEXT(trace, 2, __FUNCTION__); |
| 1753 | if (ch == NULL) |
| 1754 | return; |
| 1755 | |
| 1756 | channel_free(ch); |
| 1757 | while (*c) { |
| 1758 | if (*c == ch) { |
| 1759 | *c = ch->next; |
| 1760 | fsm_deltimer(&ch->timer); |
| 1761 | kfree_fsm(ch->fsm); |
| 1762 | clear_normalized_cda(&ch->ccw[4]); |
| 1763 | if (ch->trans_skb != NULL) { |
| 1764 | clear_normalized_cda(&ch->ccw[1]); |
| 1765 | dev_kfree_skb(ch->trans_skb); |
| 1766 | } |
| 1767 | kfree(ch->ccw); |
| 1768 | kfree(ch->irb); |
| 1769 | kfree(ch); |
| 1770 | return; |
| 1771 | } |
| 1772 | c = &((*c)->next); |
| 1773 | } |
| 1774 | } |
| 1775 | |
| 1776 | /** |
| 1777 | * Get a specific channel from the channel list. |
| 1778 | * |
| 1779 | * @param type Type of channel we are interested in. |
| 1780 | * @param id Id of channel we are interested in. |
| 1781 | * @param direction Direction we want to use this channel for. |
| 1782 | * |
| 1783 | * @return Pointer to a channel or NULL if no matching channel available. |
| 1784 | */ |
| 1785 | static struct channel |
| 1786 | * |
| 1787 | channel_get(enum channel_types type, char *id, int direction) |
| 1788 | { |
| 1789 | struct channel *ch = channels; |
| 1790 | |
| 1791 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 1792 | #ifdef DEBUG |
| 1793 | ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n", |
| 1794 | __func__, id, type); |
| 1795 | #endif |
| 1796 | |
| 1797 | while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) { |
| 1798 | #ifdef DEBUG |
| 1799 | ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n", |
| 1800 | __func__, ch, ch->id, ch->type); |
| 1801 | #endif |
| 1802 | ch = ch->next; |
| 1803 | } |
| 1804 | #ifdef DEBUG |
| 1805 | ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n", |
| 1806 | __func__, ch, ch->id, ch->type); |
| 1807 | #endif |
| 1808 | if (!ch) { |
| 1809 | ctc_pr_warn("ctc: %s(): channel with id %s " |
| 1810 | "and type %d not found in channel list\n", |
| 1811 | __func__, id, type); |
| 1812 | } else { |
| 1813 | if (ch->flags & CHANNEL_FLAGS_INUSE) |
| 1814 | ch = NULL; |
| 1815 | else { |
| 1816 | ch->flags |= CHANNEL_FLAGS_INUSE; |
| 1817 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; |
| 1818 | ch->flags |= (direction == WRITE) |
| 1819 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; |
| 1820 | fsm_newstate(ch->fsm, CH_STATE_STOPPED); |
| 1821 | } |
| 1822 | } |
| 1823 | return ch; |
| 1824 | } |
| 1825 | |
| 1826 | /** |
| 1827 | * Return the channel type by name. |
| 1828 | * |
| 1829 | * @param name Name of network interface. |
| 1830 | * |
| 1831 | * @return Type class of channel to be used for that interface. |
| 1832 | */ |
| 1833 | static enum channel_types inline |
| 1834 | extract_channel_media(char *name) |
| 1835 | { |
| 1836 | enum channel_types ret = channel_type_unknown; |
| 1837 | |
| 1838 | if (name != NULL) { |
| 1839 | if (strncmp(name, "ctc", 3) == 0) |
| 1840 | ret = channel_type_parallel; |
| 1841 | if (strncmp(name, "escon", 5) == 0) |
| 1842 | ret = channel_type_escon; |
| 1843 | } |
| 1844 | return ret; |
| 1845 | } |
| 1846 | |
| 1847 | static long |
| 1848 | __ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb) |
| 1849 | { |
| 1850 | if (!IS_ERR(irb)) |
| 1851 | return 0; |
| 1852 | |
| 1853 | switch (PTR_ERR(irb)) { |
| 1854 | case -EIO: |
| 1855 | ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id); |
| 1856 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); |
| 1857 | // CTC_DBF_TEXT_(trace, 2, " rc%d", -EIO); |
| 1858 | break; |
| 1859 | case -ETIMEDOUT: |
| 1860 | ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id); |
| 1861 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); |
| 1862 | // CTC_DBF_TEXT_(trace, 2, " rc%d", -ETIMEDOUT); |
| 1863 | break; |
| 1864 | default: |
| 1865 | ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb), |
| 1866 | cdev->dev.bus_id); |
| 1867 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); |
| 1868 | // CTC_DBF_TEXT(trace, 2, " rc???"); |
| 1869 | } |
| 1870 | return PTR_ERR(irb); |
| 1871 | } |
| 1872 | |
| 1873 | /** |
| 1874 | * Main IRQ handler. |
| 1875 | * |
| 1876 | * @param cdev The ccw_device the interrupt is for. |
| 1877 | * @param intparm interruption parameter. |
| 1878 | * @param irb interruption response block. |
| 1879 | */ |
| 1880 | static void |
| 1881 | ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) |
| 1882 | { |
| 1883 | struct channel *ch; |
| 1884 | struct net_device *dev; |
| 1885 | struct ctc_priv *priv; |
| 1886 | |
| 1887 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 1888 | if (__ctc_check_irb_error(cdev, irb)) |
| 1889 | return; |
| 1890 | |
| 1891 | /* Check for unsolicited interrupts. */ |
| 1892 | if (!cdev->dev.driver_data) { |
| 1893 | ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n", |
| 1894 | cdev->dev.bus_id, irb->scsw.cstat, |
| 1895 | irb->scsw.dstat); |
| 1896 | return; |
| 1897 | } |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 1898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | priv = ((struct ccwgroup_device *)cdev->dev.driver_data) |
| 1900 | ->dev.driver_data; |
| 1901 | |
| 1902 | /* Try to extract channel from driver data. */ |
| 1903 | if (priv->channel[READ]->cdev == cdev) |
| 1904 | ch = priv->channel[READ]; |
| 1905 | else if (priv->channel[WRITE]->cdev == cdev) |
| 1906 | ch = priv->channel[WRITE]; |
| 1907 | else { |
| 1908 | ctc_pr_err("ctc: Can't determine channel for interrupt, " |
| 1909 | "device %s\n", cdev->dev.bus_id); |
| 1910 | return; |
| 1911 | } |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 1912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | dev = (struct net_device *) (ch->netdev); |
| 1914 | if (dev == NULL) { |
| 1915 | ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n", |
| 1916 | cdev->dev.bus_id, ch); |
| 1917 | return; |
| 1918 | } |
| 1919 | |
| 1920 | #ifdef DEBUG |
| 1921 | ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n", |
| 1922 | dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat); |
| 1923 | #endif |
| 1924 | |
| 1925 | /* Copy interruption response block. */ |
| 1926 | memcpy(ch->irb, irb, sizeof(struct irb)); |
| 1927 | |
| 1928 | /* Check for good subchannel return code, otherwise error message */ |
| 1929 | if (ch->irb->scsw.cstat) { |
| 1930 | fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch); |
| 1931 | ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n", |
| 1932 | dev->name, ch->id, ch->irb->scsw.cstat, |
| 1933 | ch->irb->scsw.dstat); |
| 1934 | return; |
| 1935 | } |
| 1936 | |
| 1937 | /* Check the reason-code of a unit check */ |
| 1938 | if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) { |
| 1939 | ccw_unit_check(ch, ch->irb->ecw[0]); |
| 1940 | return; |
| 1941 | } |
| 1942 | if (ch->irb->scsw.dstat & DEV_STAT_BUSY) { |
| 1943 | if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) |
| 1944 | fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch); |
| 1945 | else |
| 1946 | fsm_event(ch->fsm, CH_EVENT_BUSY, ch); |
| 1947 | return; |
| 1948 | } |
| 1949 | if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) { |
| 1950 | fsm_event(ch->fsm, CH_EVENT_ATTN, ch); |
| 1951 | return; |
| 1952 | } |
| 1953 | if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) || |
| 1954 | (ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) || |
| 1955 | (ch->irb->scsw.stctl == |
| 1956 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) |
| 1957 | fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch); |
| 1958 | else |
| 1959 | fsm_event(ch->fsm, CH_EVENT_IRQ, ch); |
| 1960 | |
| 1961 | } |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 1962 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | /** |
| 1964 | * Actions for interface - statemachine. |
| 1965 | *****************************************************************************/ |
| 1966 | |
| 1967 | /** |
| 1968 | * Startup channels by sending CH_EVENT_START to each channel. |
| 1969 | * |
| 1970 | * @param fi An instance of an interface statemachine. |
| 1971 | * @param event The event, just happened. |
| 1972 | * @param arg Generic pointer, casted from struct net_device * upon call. |
| 1973 | */ |
| 1974 | static void |
| 1975 | dev_action_start(fsm_instance * fi, int event, void *arg) |
| 1976 | { |
| 1977 | struct net_device *dev = (struct net_device *) arg; |
| 1978 | struct ctc_priv *privptr = dev->priv; |
| 1979 | int direction; |
| 1980 | |
| 1981 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 1982 | fsm_deltimer(&privptr->restart_timer); |
| 1983 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); |
| 1984 | for (direction = READ; direction <= WRITE; direction++) { |
| 1985 | struct channel *ch = privptr->channel[direction]; |
| 1986 | fsm_event(ch->fsm, CH_EVENT_START, ch); |
| 1987 | } |
| 1988 | } |
| 1989 | |
| 1990 | /** |
| 1991 | * Shutdown channels by sending CH_EVENT_STOP to each channel. |
| 1992 | * |
| 1993 | * @param fi An instance of an interface statemachine. |
| 1994 | * @param event The event, just happened. |
| 1995 | * @param arg Generic pointer, casted from struct net_device * upon call. |
| 1996 | */ |
| 1997 | static void |
| 1998 | dev_action_stop(fsm_instance * fi, int event, void *arg) |
| 1999 | { |
| 2000 | struct net_device *dev = (struct net_device *) arg; |
| 2001 | struct ctc_priv *privptr = dev->priv; |
| 2002 | int direction; |
| 2003 | |
| 2004 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2005 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); |
| 2006 | for (direction = READ; direction <= WRITE; direction++) { |
| 2007 | struct channel *ch = privptr->channel[direction]; |
| 2008 | fsm_event(ch->fsm, CH_EVENT_STOP, ch); |
| 2009 | } |
| 2010 | } |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2011 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | dev_action_restart(fsm_instance *fi, int event, void *arg) |
| 2013 | { |
| 2014 | struct net_device *dev = (struct net_device *)arg; |
| 2015 | struct ctc_priv *privptr = dev->priv; |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2016 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2018 | ctc_pr_debug("%s: Restarting\n", dev->name); |
| 2019 | dev_action_stop(fi, event, arg); |
| 2020 | fsm_event(privptr->fsm, DEV_EVENT_STOP, dev); |
| 2021 | fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC, |
| 2022 | DEV_EVENT_START, dev); |
| 2023 | } |
| 2024 | |
| 2025 | /** |
| 2026 | * Called from channel statemachine |
| 2027 | * when a channel is up and running. |
| 2028 | * |
| 2029 | * @param fi An instance of an interface statemachine. |
| 2030 | * @param event The event, just happened. |
| 2031 | * @param arg Generic pointer, casted from struct net_device * upon call. |
| 2032 | */ |
| 2033 | static void |
| 2034 | dev_action_chup(fsm_instance * fi, int event, void *arg) |
| 2035 | { |
| 2036 | struct net_device *dev = (struct net_device *) arg; |
| 2037 | struct ctc_priv *privptr = dev->priv; |
| 2038 | |
| 2039 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2040 | switch (fsm_getstate(fi)) { |
| 2041 | case DEV_STATE_STARTWAIT_RXTX: |
| 2042 | if (event == DEV_EVENT_RXUP) |
| 2043 | fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); |
| 2044 | else |
| 2045 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); |
| 2046 | break; |
| 2047 | case DEV_STATE_STARTWAIT_RX: |
| 2048 | if (event == DEV_EVENT_RXUP) { |
| 2049 | fsm_newstate(fi, DEV_STATE_RUNNING); |
| 2050 | ctc_pr_info("%s: connected with remote side\n", |
| 2051 | dev->name); |
| 2052 | if (privptr->protocol == CTC_PROTO_LINUX_TTY) |
| 2053 | ctc_tty_setcarrier(dev, 1); |
| 2054 | ctc_clear_busy(dev); |
| 2055 | } |
| 2056 | break; |
| 2057 | case DEV_STATE_STARTWAIT_TX: |
| 2058 | if (event == DEV_EVENT_TXUP) { |
| 2059 | fsm_newstate(fi, DEV_STATE_RUNNING); |
| 2060 | ctc_pr_info("%s: connected with remote side\n", |
| 2061 | dev->name); |
| 2062 | if (privptr->protocol == CTC_PROTO_LINUX_TTY) |
| 2063 | ctc_tty_setcarrier(dev, 1); |
| 2064 | ctc_clear_busy(dev); |
| 2065 | } |
| 2066 | break; |
| 2067 | case DEV_STATE_STOPWAIT_TX: |
| 2068 | if (event == DEV_EVENT_RXUP) |
| 2069 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); |
| 2070 | break; |
| 2071 | case DEV_STATE_STOPWAIT_RX: |
| 2072 | if (event == DEV_EVENT_TXUP) |
| 2073 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); |
| 2074 | break; |
| 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | /** |
| 2079 | * Called from channel statemachine |
| 2080 | * when a channel has been shutdown. |
| 2081 | * |
| 2082 | * @param fi An instance of an interface statemachine. |
| 2083 | * @param event The event, just happened. |
| 2084 | * @param arg Generic pointer, casted from struct net_device * upon call. |
| 2085 | */ |
| 2086 | static void |
| 2087 | dev_action_chdown(fsm_instance * fi, int event, void *arg) |
| 2088 | { |
| 2089 | struct net_device *dev = (struct net_device *) arg; |
| 2090 | struct ctc_priv *privptr = dev->priv; |
| 2091 | |
| 2092 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2093 | switch (fsm_getstate(fi)) { |
| 2094 | case DEV_STATE_RUNNING: |
| 2095 | if (privptr->protocol == CTC_PROTO_LINUX_TTY) |
| 2096 | ctc_tty_setcarrier(dev, 0); |
| 2097 | if (event == DEV_EVENT_TXDOWN) |
| 2098 | fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); |
| 2099 | else |
| 2100 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); |
| 2101 | break; |
| 2102 | case DEV_STATE_STARTWAIT_RX: |
| 2103 | if (event == DEV_EVENT_TXDOWN) |
| 2104 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); |
| 2105 | break; |
| 2106 | case DEV_STATE_STARTWAIT_TX: |
| 2107 | if (event == DEV_EVENT_RXDOWN) |
| 2108 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); |
| 2109 | break; |
| 2110 | case DEV_STATE_STOPWAIT_RXTX: |
| 2111 | if (event == DEV_EVENT_TXDOWN) |
| 2112 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); |
| 2113 | else |
| 2114 | fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); |
| 2115 | break; |
| 2116 | case DEV_STATE_STOPWAIT_RX: |
| 2117 | if (event == DEV_EVENT_RXDOWN) |
| 2118 | fsm_newstate(fi, DEV_STATE_STOPPED); |
| 2119 | break; |
| 2120 | case DEV_STATE_STOPWAIT_TX: |
| 2121 | if (event == DEV_EVENT_TXDOWN) |
| 2122 | fsm_newstate(fi, DEV_STATE_STOPPED); |
| 2123 | break; |
| 2124 | } |
| 2125 | } |
| 2126 | |
| 2127 | static const fsm_node dev_fsm[] = { |
| 2128 | {DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start}, |
| 2129 | |
| 2130 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, |
| 2131 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, |
| 2132 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, |
| 2133 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2134 | |
| 2135 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, |
| 2136 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, |
| 2137 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, |
| 2138 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, |
| 2139 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2140 | |
| 2141 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, |
| 2142 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, |
| 2143 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, |
| 2144 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, |
| 2145 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2146 | |
| 2147 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, |
| 2148 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, |
| 2149 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, |
| 2150 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, |
| 2151 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, |
| 2152 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2153 | |
| 2154 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, |
| 2155 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, |
| 2156 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, |
| 2157 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, |
| 2158 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2159 | |
| 2160 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, |
| 2161 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, |
| 2162 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, |
| 2163 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, |
| 2164 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, |
| 2165 | |
| 2166 | {DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, |
| 2167 | {DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, |
| 2168 | {DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, |
| 2169 | {DEV_STATE_RUNNING, DEV_EVENT_TXUP, fsm_action_nop }, |
| 2170 | {DEV_STATE_RUNNING, DEV_EVENT_RXUP, fsm_action_nop }, |
| 2171 | {DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, |
| 2172 | }; |
| 2173 | |
| 2174 | static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node); |
| 2175 | |
| 2176 | /** |
| 2177 | * Transmit a packet. |
| 2178 | * This is a helper function for ctc_tx(). |
| 2179 | * |
| 2180 | * @param ch Channel to be used for sending. |
| 2181 | * @param skb Pointer to struct sk_buff of packet to send. |
| 2182 | * The linklevel header has already been set up |
| 2183 | * by ctc_tx(). |
| 2184 | * |
| 2185 | * @return 0 on success, -ERRNO on failure. (Never fails.) |
| 2186 | */ |
| 2187 | static int |
| 2188 | transmit_skb(struct channel *ch, struct sk_buff *skb) |
| 2189 | { |
| 2190 | unsigned long saveflags; |
| 2191 | struct ll_header header; |
| 2192 | int rc = 0; |
| 2193 | |
| 2194 | DBF_TEXT(trace, 5, __FUNCTION__); |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2195 | /* we need to acquire the lock for testing the state |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2196 | * otherwise we can have an IRQ changing the state to |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2197 | * TXIDLE after the test but before acquiring the lock. |
| 2198 | */ |
| 2199 | spin_lock_irqsave(&ch->collect_lock, saveflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) { |
| 2201 | int l = skb->len + LL_HEADER_LENGTH; |
| 2202 | |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2203 | if (ch->collect_len + l > ch->max_bufsize - 2) { |
| 2204 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
| 2205 | return -EBUSY; |
| 2206 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | atomic_inc(&skb->users); |
| 2208 | header.length = l; |
| 2209 | header.type = skb->protocol; |
| 2210 | header.unused = 0; |
| 2211 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, |
| 2212 | LL_HEADER_LENGTH); |
| 2213 | skb_queue_tail(&ch->collect_queue, skb); |
| 2214 | ch->collect_len += l; |
| 2215 | } |
| 2216 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
| 2217 | } else { |
| 2218 | __u16 block_len; |
| 2219 | int ccw_idx; |
| 2220 | struct sk_buff *nskb; |
| 2221 | unsigned long hi; |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2222 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | /** |
| 2224 | * Protect skb against beeing free'd by upper |
| 2225 | * layers. |
| 2226 | */ |
| 2227 | atomic_inc(&skb->users); |
| 2228 | ch->prof.txlen += skb->len; |
| 2229 | header.length = skb->len + LL_HEADER_LENGTH; |
| 2230 | header.type = skb->protocol; |
| 2231 | header.unused = 0; |
| 2232 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, |
| 2233 | LL_HEADER_LENGTH); |
| 2234 | block_len = skb->len + 2; |
| 2235 | *((__u16 *) skb_push(skb, 2)) = block_len; |
| 2236 | |
| 2237 | /** |
| 2238 | * IDAL support in CTC is broken, so we have to |
| 2239 | * care about skb's above 2G ourselves. |
| 2240 | */ |
| 2241 | hi = ((unsigned long) skb->tail + LL_HEADER_LENGTH) >> 31; |
| 2242 | if (hi) { |
| 2243 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); |
| 2244 | if (!nskb) { |
| 2245 | atomic_dec(&skb->users); |
| 2246 | skb_pull(skb, LL_HEADER_LENGTH + 2); |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2247 | ctc_clear_busy(ch->netdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | return -ENOMEM; |
| 2249 | } else { |
| 2250 | memcpy(skb_put(nskb, skb->len), |
| 2251 | skb->data, skb->len); |
| 2252 | atomic_inc(&nskb->users); |
| 2253 | atomic_dec(&skb->users); |
| 2254 | dev_kfree_skb_irq(skb); |
| 2255 | skb = nskb; |
| 2256 | } |
| 2257 | } |
| 2258 | |
| 2259 | ch->ccw[4].count = block_len; |
| 2260 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { |
| 2261 | /** |
| 2262 | * idal allocation failed, try via copying to |
| 2263 | * trans_skb. trans_skb usually has a pre-allocated |
| 2264 | * idal. |
| 2265 | */ |
| 2266 | if (ctc_checkalloc_buffer(ch, 1)) { |
| 2267 | /** |
| 2268 | * Remove our header. It gets added |
| 2269 | * again on retransmit. |
| 2270 | */ |
| 2271 | atomic_dec(&skb->users); |
| 2272 | skb_pull(skb, LL_HEADER_LENGTH + 2); |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2273 | ctc_clear_busy(ch->netdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | return -EBUSY; |
| 2275 | } |
| 2276 | |
| 2277 | ch->trans_skb->tail = ch->trans_skb->data; |
| 2278 | ch->trans_skb->len = 0; |
| 2279 | ch->ccw[1].count = skb->len; |
| 2280 | memcpy(skb_put(ch->trans_skb, skb->len), skb->data, |
| 2281 | skb->len); |
| 2282 | atomic_dec(&skb->users); |
| 2283 | dev_kfree_skb_irq(skb); |
| 2284 | ccw_idx = 0; |
| 2285 | } else { |
| 2286 | skb_queue_tail(&ch->io_queue, skb); |
| 2287 | ccw_idx = 3; |
| 2288 | } |
| 2289 | ch->retry = 0; |
| 2290 | fsm_newstate(ch->fsm, CH_STATE_TX); |
| 2291 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); |
| 2292 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); |
| 2293 | ch->prof.send_stamp = xtime; |
| 2294 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], |
| 2295 | (unsigned long) ch, 0xff, 0); |
| 2296 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); |
| 2297 | if (ccw_idx == 3) |
| 2298 | ch->prof.doios_single++; |
| 2299 | if (rc != 0) { |
| 2300 | fsm_deltimer(&ch->timer); |
| 2301 | ccw_check_return_code(ch, rc, "single skb TX"); |
| 2302 | if (ccw_idx == 3) |
| 2303 | skb_dequeue_tail(&ch->io_queue); |
| 2304 | /** |
| 2305 | * Remove our header. It gets added |
| 2306 | * again on retransmit. |
| 2307 | */ |
| 2308 | skb_pull(skb, LL_HEADER_LENGTH + 2); |
| 2309 | } else { |
| 2310 | if (ccw_idx == 0) { |
| 2311 | struct net_device *dev = ch->netdev; |
| 2312 | struct ctc_priv *privptr = dev->priv; |
| 2313 | privptr->stats.tx_packets++; |
| 2314 | privptr->stats.tx_bytes += |
| 2315 | skb->len - LL_HEADER_LENGTH; |
| 2316 | } |
| 2317 | } |
| 2318 | } |
| 2319 | |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2320 | ctc_clear_busy(ch->netdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | return rc; |
| 2322 | } |
Frank Pavlic | e172577d | 2005-09-08 09:50:06 +0200 | [diff] [blame] | 2323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | /** |
| 2325 | * Interface API for upper network layers |
| 2326 | *****************************************************************************/ |
| 2327 | |
| 2328 | /** |
| 2329 | * Open an interface. |
| 2330 | * Called from generic network layer when ifconfig up is run. |
| 2331 | * |
| 2332 | * @param dev Pointer to interface struct. |
| 2333 | * |
| 2334 | * @return 0 on success, -ERRNO on failure. (Never fails.) |
| 2335 | */ |
| 2336 | static int |
| 2337 | ctc_open(struct net_device * dev) |
| 2338 | { |
| 2339 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 2340 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev); |
| 2341 | return 0; |
| 2342 | } |
| 2343 | |
| 2344 | /** |
| 2345 | * Close an interface. |
| 2346 | * Called from generic network layer when ifconfig down is run. |
| 2347 | * |
| 2348 | * @param dev Pointer to interface struct. |
| 2349 | * |
| 2350 | * @return 0 on success, -ERRNO on failure. (Never fails.) |
| 2351 | */ |
| 2352 | static int |
| 2353 | ctc_close(struct net_device * dev) |
| 2354 | { |
| 2355 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 2356 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev); |
| 2357 | return 0; |
| 2358 | } |
| 2359 | |
| 2360 | /** |
| 2361 | * Start transmission of a packet. |
| 2362 | * Called from generic network device layer. |
| 2363 | * |
| 2364 | * @param skb Pointer to buffer containing the packet. |
| 2365 | * @param dev Pointer to interface struct. |
| 2366 | * |
| 2367 | * @return 0 if packet consumed, !0 if packet rejected. |
| 2368 | * Note: If we return !0, then the packet is free'd by |
| 2369 | * the generic network layer. |
| 2370 | */ |
| 2371 | static int |
| 2372 | ctc_tx(struct sk_buff *skb, struct net_device * dev) |
| 2373 | { |
| 2374 | int rc = 0; |
| 2375 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; |
| 2376 | |
| 2377 | DBF_TEXT(trace, 5, __FUNCTION__); |
| 2378 | /** |
| 2379 | * Some sanity checks ... |
| 2380 | */ |
| 2381 | if (skb == NULL) { |
| 2382 | ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name); |
| 2383 | privptr->stats.tx_dropped++; |
| 2384 | return 0; |
| 2385 | } |
| 2386 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { |
| 2387 | ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n", |
| 2388 | dev->name, LL_HEADER_LENGTH + 2); |
| 2389 | dev_kfree_skb(skb); |
| 2390 | privptr->stats.tx_dropped++; |
| 2391 | return 0; |
| 2392 | } |
| 2393 | |
| 2394 | /** |
| 2395 | * If channels are not running, try to restart them |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2396 | * and throw away packet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2397 | */ |
| 2398 | if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) { |
| 2399 | fsm_event(privptr->fsm, DEV_EVENT_START, dev); |
| 2400 | if (privptr->protocol == CTC_PROTO_LINUX_TTY) |
| 2401 | return -EBUSY; |
| 2402 | dev_kfree_skb(skb); |
| 2403 | privptr->stats.tx_dropped++; |
| 2404 | privptr->stats.tx_errors++; |
| 2405 | privptr->stats.tx_carrier_errors++; |
| 2406 | return 0; |
| 2407 | } |
| 2408 | |
| 2409 | if (ctc_test_and_set_busy(dev)) |
| 2410 | return -EBUSY; |
| 2411 | |
| 2412 | dev->trans_start = jiffies; |
| 2413 | if (transmit_skb(privptr->channel[WRITE], skb) != 0) |
| 2414 | rc = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | return rc; |
| 2416 | } |
| 2417 | |
| 2418 | /** |
| 2419 | * Sets MTU of an interface. |
| 2420 | * |
| 2421 | * @param dev Pointer to interface struct. |
| 2422 | * @param new_mtu The new MTU to use for this interface. |
| 2423 | * |
| 2424 | * @return 0 on success, -EINVAL if MTU is out of valid range. |
| 2425 | * (valid range is 576 .. 65527). If VM is on the |
| 2426 | * remote side, maximum MTU is 32760, however this is |
| 2427 | * <em>not</em> checked here. |
| 2428 | */ |
| 2429 | static int |
| 2430 | ctc_change_mtu(struct net_device * dev, int new_mtu) |
| 2431 | { |
| 2432 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; |
| 2433 | |
| 2434 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2435 | if ((new_mtu < 576) || (new_mtu > 65527) || |
| 2436 | (new_mtu > (privptr->channel[READ]->max_bufsize - |
| 2437 | LL_HEADER_LENGTH - 2))) |
| 2438 | return -EINVAL; |
| 2439 | dev->mtu = new_mtu; |
| 2440 | dev->hard_header_len = LL_HEADER_LENGTH + 2; |
| 2441 | return 0; |
| 2442 | } |
| 2443 | |
| 2444 | /** |
| 2445 | * Returns interface statistics of a device. |
| 2446 | * |
| 2447 | * @param dev Pointer to interface struct. |
| 2448 | * |
| 2449 | * @return Pointer to stats struct of this interface. |
| 2450 | */ |
| 2451 | static struct net_device_stats * |
| 2452 | ctc_stats(struct net_device * dev) |
| 2453 | { |
| 2454 | return &((struct ctc_priv *) dev->priv)->stats; |
| 2455 | } |
| 2456 | |
| 2457 | /* |
| 2458 | * sysfs attributes |
| 2459 | */ |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2462 | buffer_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | { |
| 2464 | struct ctc_priv *priv; |
| 2465 | |
| 2466 | priv = dev->driver_data; |
| 2467 | if (!priv) |
| 2468 | return -ENODEV; |
| 2469 | return sprintf(buf, "%d\n", |
| 2470 | priv->buffer_size); |
| 2471 | } |
| 2472 | |
| 2473 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2474 | buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | { |
| 2476 | struct ctc_priv *priv; |
| 2477 | struct net_device *ndev; |
| 2478 | int bs1; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2479 | char buffer[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | |
| 2481 | DBF_TEXT(trace, 3, __FUNCTION__); |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2482 | DBF_TEXT(trace, 3, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | priv = dev->driver_data; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2484 | if (!priv) { |
| 2485 | DBF_TEXT(trace, 3, "bfnopriv"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | return -ENODEV; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2487 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2489 | sscanf(buf, "%u", &bs1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | if (bs1 > CTC_BUFSIZE_LIMIT) |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2491 | goto einval; |
| 2492 | if (bs1 < (576 + LL_HEADER_LENGTH + 2)) |
| 2493 | goto einval; |
| 2494 | priv->buffer_size = bs1; // just to overwrite the default |
| 2495 | |
| 2496 | ndev = priv->channel[READ]->netdev; |
| 2497 | if (!ndev) { |
| 2498 | DBF_TEXT(trace, 3, "bfnondev"); |
| 2499 | return -ENODEV; |
| 2500 | } |
| 2501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | if ((ndev->flags & IFF_RUNNING) && |
| 2503 | (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2))) |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2504 | goto einval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2506 | priv->channel[READ]->max_bufsize = bs1; |
| 2507 | priv->channel[WRITE]->max_bufsize = bs1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | if (!(ndev->flags & IFF_RUNNING)) |
| 2509 | ndev->mtu = bs1 - LL_HEADER_LENGTH - 2; |
| 2510 | priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; |
| 2511 | priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; |
| 2512 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2513 | sprintf(buffer, "%d",priv->buffer_size); |
| 2514 | DBF_TEXT(trace, 3, buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | return count; |
| 2516 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2517 | einval: |
| 2518 | DBF_TEXT(trace, 3, "buff_err"); |
| 2519 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2520 | } |
| 2521 | |
| 2522 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2523 | loglevel_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2525 | return sprintf(buf, "%d\n", loglevel); |
| 2526 | } |
| 2527 | |
| 2528 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2529 | loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2531 | int ll1; |
| 2532 | |
| 2533 | DBF_TEXT(trace, 5, __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2534 | sscanf(buf, "%i", &ll1); |
| 2535 | |
| 2536 | if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0)) |
| 2537 | return -EINVAL; |
| 2538 | loglevel = ll1; |
| 2539 | return count; |
| 2540 | } |
| 2541 | |
| 2542 | static void |
| 2543 | ctc_print_statistics(struct ctc_priv *priv) |
| 2544 | { |
| 2545 | char *sbuf; |
| 2546 | char *p; |
| 2547 | |
| 2548 | DBF_TEXT(trace, 4, __FUNCTION__); |
| 2549 | if (!priv) |
| 2550 | return; |
| 2551 | sbuf = (char *)kmalloc(2048, GFP_KERNEL); |
| 2552 | if (sbuf == NULL) |
| 2553 | return; |
| 2554 | p = sbuf; |
| 2555 | |
| 2556 | p += sprintf(p, " Device FSM state: %s\n", |
| 2557 | fsm_getstate_str(priv->fsm)); |
| 2558 | p += sprintf(p, " RX channel FSM state: %s\n", |
| 2559 | fsm_getstate_str(priv->channel[READ]->fsm)); |
| 2560 | p += sprintf(p, " TX channel FSM state: %s\n", |
| 2561 | fsm_getstate_str(priv->channel[WRITE]->fsm)); |
| 2562 | p += sprintf(p, " Max. TX buffer used: %ld\n", |
| 2563 | priv->channel[WRITE]->prof.maxmulti); |
| 2564 | p += sprintf(p, " Max. chained SKBs: %ld\n", |
| 2565 | priv->channel[WRITE]->prof.maxcqueue); |
| 2566 | p += sprintf(p, " TX single write ops: %ld\n", |
| 2567 | priv->channel[WRITE]->prof.doios_single); |
| 2568 | p += sprintf(p, " TX multi write ops: %ld\n", |
| 2569 | priv->channel[WRITE]->prof.doios_multi); |
| 2570 | p += sprintf(p, " Netto bytes written: %ld\n", |
| 2571 | priv->channel[WRITE]->prof.txlen); |
| 2572 | p += sprintf(p, " Max. TX IO-time: %ld\n", |
| 2573 | priv->channel[WRITE]->prof.tx_time); |
| 2574 | |
| 2575 | ctc_pr_debug("Statistics for %s:\n%s", |
| 2576 | priv->channel[WRITE]->netdev->name, sbuf); |
| 2577 | kfree(sbuf); |
| 2578 | return; |
| 2579 | } |
| 2580 | |
| 2581 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2582 | stats_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | { |
| 2584 | struct ctc_priv *priv = dev->driver_data; |
| 2585 | if (!priv) |
| 2586 | return -ENODEV; |
| 2587 | ctc_print_statistics(priv); |
| 2588 | return sprintf(buf, "0\n"); |
| 2589 | } |
| 2590 | |
| 2591 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2592 | stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | { |
| 2594 | struct ctc_priv *priv = dev->driver_data; |
| 2595 | if (!priv) |
| 2596 | return -ENODEV; |
| 2597 | /* Reset statistics */ |
| 2598 | memset(&priv->channel[WRITE]->prof, 0, |
| 2599 | sizeof(priv->channel[WRITE]->prof)); |
| 2600 | return count; |
| 2601 | } |
| 2602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | static void |
| 2604 | ctc_netdev_unregister(struct net_device * dev) |
| 2605 | { |
| 2606 | struct ctc_priv *privptr; |
| 2607 | |
| 2608 | if (!dev) |
| 2609 | return; |
| 2610 | privptr = (struct ctc_priv *) dev->priv; |
| 2611 | if (privptr->protocol != CTC_PROTO_LINUX_TTY) |
| 2612 | unregister_netdev(dev); |
| 2613 | else |
| 2614 | ctc_tty_unregister_netdev(dev); |
| 2615 | } |
| 2616 | |
| 2617 | static int |
| 2618 | ctc_netdev_register(struct net_device * dev) |
| 2619 | { |
| 2620 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; |
| 2621 | if (privptr->protocol != CTC_PROTO_LINUX_TTY) |
| 2622 | return register_netdev(dev); |
| 2623 | else |
| 2624 | return ctc_tty_register_netdev(dev); |
| 2625 | } |
| 2626 | |
| 2627 | static void |
| 2628 | ctc_free_netdevice(struct net_device * dev, int free_dev) |
| 2629 | { |
| 2630 | struct ctc_priv *privptr; |
| 2631 | if (!dev) |
| 2632 | return; |
| 2633 | privptr = dev->priv; |
| 2634 | if (privptr) { |
| 2635 | if (privptr->fsm) |
| 2636 | kfree_fsm(privptr->fsm); |
| 2637 | kfree(privptr); |
| 2638 | } |
| 2639 | #ifdef MODULE |
| 2640 | if (free_dev) |
| 2641 | free_netdev(dev); |
| 2642 | #endif |
| 2643 | } |
| 2644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2645 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2646 | ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | { |
| 2648 | struct ctc_priv *priv; |
| 2649 | |
| 2650 | priv = dev->driver_data; |
| 2651 | if (!priv) |
| 2652 | return -ENODEV; |
| 2653 | |
| 2654 | return sprintf(buf, "%d\n", priv->protocol); |
| 2655 | } |
| 2656 | |
| 2657 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2658 | ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2659 | { |
| 2660 | struct ctc_priv *priv; |
| 2661 | int value; |
| 2662 | |
| 2663 | DBF_TEXT(trace, 3, __FUNCTION__); |
| 2664 | pr_debug("%s() called\n", __FUNCTION__); |
| 2665 | |
| 2666 | priv = dev->driver_data; |
| 2667 | if (!priv) |
| 2668 | return -ENODEV; |
| 2669 | sscanf(buf, "%u", &value); |
| 2670 | if ((value < 0) || (value > CTC_PROTO_MAX)) |
| 2671 | return -EINVAL; |
| 2672 | priv->protocol = value; |
| 2673 | |
| 2674 | return count; |
| 2675 | } |
| 2676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | static ssize_t |
Yani Ioannou | 3fd3c0a | 2005-05-17 06:43:27 -0400 | [diff] [blame] | 2678 | ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | { |
| 2680 | struct ccwgroup_device *cgdev; |
| 2681 | |
| 2682 | cgdev = to_ccwgroupdev(dev); |
| 2683 | if (!cgdev) |
| 2684 | return -ENODEV; |
| 2685 | |
| 2686 | return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]); |
| 2687 | } |
| 2688 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2689 | static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write); |
| 2690 | static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2691 | static DEVICE_ATTR(type, 0444, ctc_type_show, NULL); |
| 2692 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2693 | static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write); |
| 2694 | static DEVICE_ATTR(stats, 0644, stats_show, stats_write); |
| 2695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | static struct attribute *ctc_attr[] = { |
| 2697 | &dev_attr_protocol.attr, |
| 2698 | &dev_attr_type.attr, |
| 2699 | &dev_attr_buffer.attr, |
| 2700 | NULL, |
| 2701 | }; |
| 2702 | |
| 2703 | static struct attribute_group ctc_attr_group = { |
| 2704 | .attrs = ctc_attr, |
| 2705 | }; |
| 2706 | |
| 2707 | static int |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2708 | ctc_add_attributes(struct device *dev) |
| 2709 | { |
| 2710 | device_create_file(dev, &dev_attr_loglevel); |
| 2711 | device_create_file(dev, &dev_attr_stats); |
| 2712 | return 0; |
| 2713 | } |
| 2714 | |
| 2715 | static void |
| 2716 | ctc_remove_attributes(struct device *dev) |
| 2717 | { |
| 2718 | device_remove_file(dev, &dev_attr_stats); |
| 2719 | device_remove_file(dev, &dev_attr_loglevel); |
| 2720 | } |
| 2721 | |
| 2722 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | ctc_add_files(struct device *dev) |
| 2724 | { |
| 2725 | pr_debug("%s() called\n", __FUNCTION__); |
| 2726 | |
| 2727 | return sysfs_create_group(&dev->kobj, &ctc_attr_group); |
| 2728 | } |
| 2729 | |
| 2730 | static void |
| 2731 | ctc_remove_files(struct device *dev) |
| 2732 | { |
| 2733 | pr_debug("%s() called\n", __FUNCTION__); |
| 2734 | |
| 2735 | sysfs_remove_group(&dev->kobj, &ctc_attr_group); |
| 2736 | } |
| 2737 | |
| 2738 | /** |
| 2739 | * Add ctc specific attributes. |
| 2740 | * Add ctc private data. |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2741 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2742 | * @param cgdev pointer to ccwgroup_device just added |
| 2743 | * |
| 2744 | * @returns 0 on success, !0 on failure. |
| 2745 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | static int |
| 2747 | ctc_probe_device(struct ccwgroup_device *cgdev) |
| 2748 | { |
| 2749 | struct ctc_priv *priv; |
| 2750 | int rc; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2751 | char buffer[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | |
| 2753 | pr_debug("%s() called\n", __FUNCTION__); |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2754 | DBF_TEXT(setup, 3, __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2755 | |
| 2756 | if (!get_device(&cgdev->dev)) |
| 2757 | return -ENODEV; |
| 2758 | |
| 2759 | priv = kmalloc(sizeof (struct ctc_priv), GFP_KERNEL); |
| 2760 | if (!priv) { |
| 2761 | ctc_pr_err("%s: Out of memory\n", __func__); |
| 2762 | put_device(&cgdev->dev); |
| 2763 | return -ENOMEM; |
| 2764 | } |
| 2765 | |
| 2766 | memset(priv, 0, sizeof (struct ctc_priv)); |
| 2767 | rc = ctc_add_files(&cgdev->dev); |
| 2768 | if (rc) { |
| 2769 | kfree(priv); |
| 2770 | put_device(&cgdev->dev); |
| 2771 | return rc; |
| 2772 | } |
| 2773 | priv->buffer_size = CTC_BUFSIZE_DEFAULT; |
| 2774 | cgdev->cdev[0]->handler = ctc_irq_handler; |
| 2775 | cgdev->cdev[1]->handler = ctc_irq_handler; |
| 2776 | cgdev->dev.driver_data = priv; |
| 2777 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2778 | sprintf(buffer, "%p", priv); |
| 2779 | DBF_TEXT(data, 3, buffer); |
| 2780 | |
| 2781 | sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv)); |
| 2782 | DBF_TEXT(data, 3, buffer); |
| 2783 | |
| 2784 | sprintf(buffer, "%p", &channels); |
| 2785 | DBF_TEXT(data, 3, buffer); |
| 2786 | |
| 2787 | sprintf(buffer, "%u", (unsigned int)sizeof(struct channel)); |
| 2788 | DBF_TEXT(data, 3, buffer); |
| 2789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2790 | return 0; |
| 2791 | } |
| 2792 | |
| 2793 | /** |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2794 | * Initialize everything of the net device except the name and the |
| 2795 | * channel structs. |
| 2796 | */ |
| 2797 | static struct net_device * |
| 2798 | ctc_init_netdevice(struct net_device * dev, int alloc_device, |
| 2799 | struct ctc_priv *privptr) |
| 2800 | { |
| 2801 | if (!privptr) |
| 2802 | return NULL; |
| 2803 | |
| 2804 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 2805 | |
| 2806 | if (alloc_device) { |
| 2807 | dev = kmalloc(sizeof (struct net_device), GFP_KERNEL); |
| 2808 | if (!dev) |
| 2809 | return NULL; |
| 2810 | memset(dev, 0, sizeof (struct net_device)); |
| 2811 | } |
| 2812 | |
| 2813 | dev->priv = privptr; |
| 2814 | privptr->fsm = init_fsm("ctcdev", dev_state_names, |
| 2815 | dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS, |
| 2816 | dev_fsm, DEV_FSM_LEN, GFP_KERNEL); |
| 2817 | if (privptr->fsm == NULL) { |
| 2818 | if (alloc_device) |
| 2819 | kfree(dev); |
| 2820 | return NULL; |
| 2821 | } |
| 2822 | fsm_newstate(privptr->fsm, DEV_STATE_STOPPED); |
| 2823 | fsm_settimer(privptr->fsm, &privptr->restart_timer); |
| 2824 | if (dev->mtu == 0) |
| 2825 | dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; |
| 2826 | dev->hard_start_xmit = ctc_tx; |
| 2827 | dev->open = ctc_open; |
| 2828 | dev->stop = ctc_close; |
| 2829 | dev->get_stats = ctc_stats; |
| 2830 | dev->change_mtu = ctc_change_mtu; |
| 2831 | dev->hard_header_len = LL_HEADER_LENGTH + 2; |
| 2832 | dev->addr_len = 0; |
| 2833 | dev->type = ARPHRD_SLIP; |
| 2834 | dev->tx_queue_len = 100; |
| 2835 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
| 2836 | SET_MODULE_OWNER(dev); |
| 2837 | return dev; |
| 2838 | } |
| 2839 | |
| 2840 | |
| 2841 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | * |
| 2843 | * Setup an interface. |
| 2844 | * |
| 2845 | * @param cgdev Device to be setup. |
| 2846 | * |
| 2847 | * @returns 0 on success, !0 on failure. |
| 2848 | */ |
| 2849 | static int |
| 2850 | ctc_new_device(struct ccwgroup_device *cgdev) |
| 2851 | { |
| 2852 | char read_id[CTC_ID_SIZE]; |
| 2853 | char write_id[CTC_ID_SIZE]; |
| 2854 | int direction; |
| 2855 | enum channel_types type; |
| 2856 | struct ctc_priv *privptr; |
| 2857 | struct net_device *dev; |
| 2858 | int ret; |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2859 | char buffer[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | |
| 2861 | pr_debug("%s() called\n", __FUNCTION__); |
| 2862 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 2863 | |
| 2864 | privptr = cgdev->dev.driver_data; |
| 2865 | if (!privptr) |
| 2866 | return -ENODEV; |
| 2867 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2868 | sprintf(buffer, "%d", privptr->buffer_size); |
| 2869 | DBF_TEXT(setup, 3, buffer); |
| 2870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2871 | type = get_channel_type(&cgdev->cdev[0]->id); |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id); |
| 2874 | snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id); |
| 2875 | |
| 2876 | if (add_channel(cgdev->cdev[0], type)) |
| 2877 | return -ENOMEM; |
| 2878 | if (add_channel(cgdev->cdev[1], type)) |
| 2879 | return -ENOMEM; |
| 2880 | |
| 2881 | ret = ccw_device_set_online(cgdev->cdev[0]); |
| 2882 | if (ret != 0) { |
| 2883 | printk(KERN_WARNING |
| 2884 | "ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret); |
| 2885 | } |
| 2886 | |
| 2887 | ret = ccw_device_set_online(cgdev->cdev[1]); |
| 2888 | if (ret != 0) { |
| 2889 | printk(KERN_WARNING |
| 2890 | "ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret); |
| 2891 | } |
| 2892 | |
| 2893 | dev = ctc_init_netdevice(NULL, 1, privptr); |
| 2894 | |
| 2895 | if (!dev) { |
| 2896 | ctc_pr_warn("ctc_init_netdevice failed\n"); |
| 2897 | goto out; |
| 2898 | } |
| 2899 | |
| 2900 | if (privptr->protocol == CTC_PROTO_LINUX_TTY) |
| 2901 | strlcpy(dev->name, "ctctty%d", IFNAMSIZ); |
| 2902 | else |
| 2903 | strlcpy(dev->name, "ctc%d", IFNAMSIZ); |
| 2904 | |
| 2905 | for (direction = READ; direction <= WRITE; direction++) { |
| 2906 | privptr->channel[direction] = |
| 2907 | channel_get(type, direction == READ ? read_id : write_id, |
| 2908 | direction); |
| 2909 | if (privptr->channel[direction] == NULL) { |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2910 | if (direction == WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | channel_free(privptr->channel[READ]); |
| 2912 | |
| 2913 | ctc_free_netdevice(dev, 1); |
| 2914 | goto out; |
| 2915 | } |
| 2916 | privptr->channel[direction]->netdev = dev; |
| 2917 | privptr->channel[direction]->protocol = privptr->protocol; |
| 2918 | privptr->channel[direction]->max_bufsize = privptr->buffer_size; |
| 2919 | } |
| 2920 | /* sysfs magic */ |
| 2921 | SET_NETDEV_DEV(dev, &cgdev->dev); |
| 2922 | |
| 2923 | if (ctc_netdev_register(dev) != 0) { |
| 2924 | ctc_free_netdevice(dev, 1); |
| 2925 | goto out; |
| 2926 | } |
| 2927 | |
| 2928 | ctc_add_attributes(&cgdev->dev); |
| 2929 | |
| 2930 | strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name)); |
| 2931 | |
| 2932 | print_banner(); |
| 2933 | |
| 2934 | ctc_pr_info("%s: read: %s, write: %s, proto: %d\n", |
| 2935 | dev->name, privptr->channel[READ]->id, |
| 2936 | privptr->channel[WRITE]->id, privptr->protocol); |
| 2937 | |
| 2938 | return 0; |
| 2939 | out: |
| 2940 | ccw_device_set_offline(cgdev->cdev[1]); |
| 2941 | ccw_device_set_offline(cgdev->cdev[0]); |
| 2942 | |
| 2943 | return -ENODEV; |
| 2944 | } |
| 2945 | |
| 2946 | /** |
| 2947 | * Shutdown an interface. |
| 2948 | * |
| 2949 | * @param cgdev Device to be shut down. |
| 2950 | * |
| 2951 | * @returns 0 on success, !0 on failure. |
| 2952 | */ |
| 2953 | static int |
| 2954 | ctc_shutdown_device(struct ccwgroup_device *cgdev) |
| 2955 | { |
| 2956 | struct ctc_priv *priv; |
| 2957 | struct net_device *ndev; |
Jeff Garzik | e82b0f2 | 2006-05-26 21:58:38 -0400 | [diff] [blame] | 2958 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2959 | DBF_TEXT(setup, 3, __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2960 | pr_debug("%s() called\n", __FUNCTION__); |
| 2961 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 2962 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | priv = cgdev->dev.driver_data; |
| 2964 | ndev = NULL; |
| 2965 | if (!priv) |
| 2966 | return -ENODEV; |
| 2967 | |
| 2968 | if (priv->channel[READ]) { |
| 2969 | ndev = priv->channel[READ]->netdev; |
| 2970 | |
| 2971 | /* Close the device */ |
| 2972 | ctc_close(ndev); |
| 2973 | ndev->flags &=~IFF_RUNNING; |
| 2974 | |
| 2975 | ctc_remove_attributes(&cgdev->dev); |
| 2976 | |
| 2977 | channel_free(priv->channel[READ]); |
| 2978 | } |
| 2979 | if (priv->channel[WRITE]) |
| 2980 | channel_free(priv->channel[WRITE]); |
| 2981 | |
| 2982 | if (ndev) { |
| 2983 | ctc_netdev_unregister(ndev); |
| 2984 | ndev->priv = NULL; |
| 2985 | ctc_free_netdevice(ndev, 1); |
| 2986 | } |
| 2987 | |
| 2988 | if (priv->fsm) |
| 2989 | kfree_fsm(priv->fsm); |
| 2990 | |
| 2991 | ccw_device_set_offline(cgdev->cdev[1]); |
| 2992 | ccw_device_set_offline(cgdev->cdev[0]); |
| 2993 | |
| 2994 | if (priv->channel[READ]) |
| 2995 | channel_remove(priv->channel[READ]); |
| 2996 | if (priv->channel[WRITE]) |
| 2997 | channel_remove(priv->channel[WRITE]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2998 | priv->channel[READ] = priv->channel[WRITE] = NULL; |
| 2999 | |
| 3000 | return 0; |
| 3001 | |
| 3002 | } |
| 3003 | |
| 3004 | static void |
| 3005 | ctc_remove_device(struct ccwgroup_device *cgdev) |
| 3006 | { |
| 3007 | struct ctc_priv *priv; |
| 3008 | |
| 3009 | pr_debug("%s() called\n", __FUNCTION__); |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 3010 | DBF_TEXT(setup, 3, __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3011 | |
| 3012 | priv = cgdev->dev.driver_data; |
| 3013 | if (!priv) |
| 3014 | return; |
| 3015 | if (cgdev->state == CCWGROUP_ONLINE) |
| 3016 | ctc_shutdown_device(cgdev); |
| 3017 | ctc_remove_files(&cgdev->dev); |
| 3018 | cgdev->dev.driver_data = NULL; |
| 3019 | kfree(priv); |
| 3020 | put_device(&cgdev->dev); |
| 3021 | } |
| 3022 | |
| 3023 | static struct ccwgroup_driver ctc_group_driver = { |
| 3024 | .owner = THIS_MODULE, |
| 3025 | .name = "ctc", |
| 3026 | .max_slaves = 2, |
| 3027 | .driver_id = 0xC3E3C3, |
| 3028 | .probe = ctc_probe_device, |
| 3029 | .remove = ctc_remove_device, |
| 3030 | .set_online = ctc_new_device, |
| 3031 | .set_offline = ctc_shutdown_device, |
| 3032 | }; |
| 3033 | |
| 3034 | /** |
| 3035 | * Module related routines |
| 3036 | *****************************************************************************/ |
| 3037 | |
| 3038 | /** |
| 3039 | * Prepare to be unloaded. Free IRQ's and release all resources. |
| 3040 | * This is called just before this module is unloaded. It is |
| 3041 | * <em>not</em> called, if the usage count is !0, so we don't need to check |
| 3042 | * for that. |
| 3043 | */ |
| 3044 | static void __exit |
| 3045 | ctc_exit(void) |
| 3046 | { |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 3047 | DBF_TEXT(setup, 3, __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3048 | unregister_cu3088_discipline(&ctc_group_driver); |
| 3049 | ctc_tty_cleanup(); |
| 3050 | ctc_unregister_dbf_views(); |
| 3051 | ctc_pr_info("CTC driver unloaded\n"); |
| 3052 | } |
| 3053 | |
| 3054 | /** |
| 3055 | * Initialize module. |
| 3056 | * This is called just after the module is loaded. |
| 3057 | * |
| 3058 | * @return 0 on success, !0 on error. |
| 3059 | */ |
| 3060 | static int __init |
| 3061 | ctc_init(void) |
| 3062 | { |
| 3063 | int ret = 0; |
| 3064 | |
Frank Pavlic | 7394c92 | 2005-05-12 20:36:47 +0200 | [diff] [blame] | 3065 | loglevel = CTC_LOGLEVEL_DEFAULT; |
| 3066 | |
| 3067 | DBF_TEXT(setup, 3, __FUNCTION__); |
| 3068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | print_banner(); |
| 3070 | |
| 3071 | ret = ctc_register_dbf_views(); |
| 3072 | if (ret){ |
| 3073 | ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret); |
| 3074 | return ret; |
| 3075 | } |
| 3076 | ctc_tty_init(); |
| 3077 | ret = register_cu3088_discipline(&ctc_group_driver); |
| 3078 | if (ret) { |
| 3079 | ctc_tty_cleanup(); |
| 3080 | ctc_unregister_dbf_views(); |
| 3081 | } |
| 3082 | return ret; |
| 3083 | } |
| 3084 | |
| 3085 | module_init(ctc_init); |
| 3086 | module_exit(ctc_exit); |
| 3087 | |
| 3088 | /* --- This is the END my friend --- */ |