Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 1999 Digi International (www.digi.com) |
| 4 | * James Puzzo <jamesp at digi dot com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 14 | * PURPOSE. See the GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * |
| 20 | * Filename: |
| 21 | * |
| 22 | * dgrp_net_ops.c |
| 23 | * |
| 24 | * Description: |
| 25 | * |
| 26 | * Handle the file operations required for the "network" devices. |
| 27 | * Includes those functions required to register the "net" devices |
| 28 | * in "/proc". |
| 29 | * |
| 30 | * Author: |
| 31 | * |
| 32 | * James A. Puzzo |
| 33 | * |
| 34 | */ |
| 35 | |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/proc_fs.h> |
David Howells | 0d01ff2 | 2013-04-11 23:51:01 +0100 | [diff] [blame] | 38 | #include <linux/slab.h> |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 39 | #include <linux/string.h> |
George Spelvin | 593fb1ae4 | 2013-02-12 02:00:43 -0500 | [diff] [blame] | 40 | #include <linux/device.h> |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 41 | #include <linux/tty.h> |
| 42 | #include <linux/tty_flip.h> |
| 43 | #include <linux/spinlock.h> |
| 44 | #include <linux/poll.h> |
| 45 | #include <linux/sched.h> |
| 46 | #include <linux/ratelimit.h> |
| 47 | #include <asm/unaligned.h> |
| 48 | |
| 49 | #define MYFLIPLEN TBUF_MAX |
| 50 | |
| 51 | #include "dgrp_common.h" |
| 52 | |
| 53 | #define TTY_FLIPBUF_SIZE 512 |
| 54 | #define DEVICE_NAME_SIZE 50 |
| 55 | |
| 56 | /* |
| 57 | * Generic helper function declarations |
| 58 | */ |
| 59 | static void parity_scan(struct ch_struct *ch, unsigned char *cbuf, |
| 60 | unsigned char *fbuf, int *len); |
| 61 | |
| 62 | /* |
| 63 | * File operation declarations |
| 64 | */ |
| 65 | static int dgrp_net_open(struct inode *, struct file *); |
| 66 | static int dgrp_net_release(struct inode *, struct file *); |
| 67 | static ssize_t dgrp_net_read(struct file *, char __user *, size_t, loff_t *); |
| 68 | static ssize_t dgrp_net_write(struct file *, const char __user *, size_t, |
| 69 | loff_t *); |
| 70 | static long dgrp_net_ioctl(struct file *file, unsigned int cmd, |
| 71 | unsigned long arg); |
| 72 | static unsigned int dgrp_net_select(struct file *file, |
| 73 | struct poll_table_struct *table); |
| 74 | |
Al Viro | af064cd | 2013-03-30 01:03:53 -0400 | [diff] [blame] | 75 | const struct file_operations dgrp_net_ops = { |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 76 | .owner = THIS_MODULE, |
| 77 | .read = dgrp_net_read, |
| 78 | .write = dgrp_net_write, |
| 79 | .poll = dgrp_net_select, |
| 80 | .unlocked_ioctl = dgrp_net_ioctl, |
| 81 | .open = dgrp_net_open, |
| 82 | .release = dgrp_net_release, |
| 83 | }; |
| 84 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 85 | /** |
| 86 | * dgrp_dump() -- prints memory for debugging purposes. |
| 87 | * @mem: Memory location which should be printed to the console |
| 88 | * @len: Number of bytes to be dumped |
| 89 | */ |
| 90 | static void dgrp_dump(u8 *mem, int len) |
| 91 | { |
| 92 | int i; |
| 93 | |
| 94 | pr_debug("dgrp dump length = %d, data = ", len); |
| 95 | for (i = 0; i < len; ++i) |
| 96 | pr_debug("%.2x ", mem[i]); |
| 97 | pr_debug("\n"); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * dgrp_read_data_block() -- Read a data block |
| 102 | * @ch: struct ch_struct * |
| 103 | * @flipbuf: u8 * |
| 104 | * @flipbuf_size: size of flipbuf |
| 105 | */ |
| 106 | static void dgrp_read_data_block(struct ch_struct *ch, u8 *flipbuf, |
| 107 | int flipbuf_size) |
| 108 | { |
| 109 | int t; |
| 110 | int n; |
| 111 | |
| 112 | if (flipbuf_size <= 0) |
| 113 | return; |
| 114 | |
| 115 | t = RBUF_MAX - ch->ch_rout; |
| 116 | n = flipbuf_size; |
| 117 | |
| 118 | if (n >= t) { |
| 119 | memcpy(flipbuf, ch->ch_rbuf + ch->ch_rout, t); |
| 120 | flipbuf += t; |
| 121 | n -= t; |
| 122 | ch->ch_rout = 0; |
| 123 | } |
| 124 | |
| 125 | memcpy(flipbuf, ch->ch_rbuf + ch->ch_rout, n); |
| 126 | flipbuf += n; |
| 127 | ch->ch_rout += n; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | /** |
| 132 | * dgrp_input() -- send data to the line disipline |
| 133 | * @ch: pointer to channel struct |
| 134 | * |
| 135 | * Copys the rbuf to the flipbuf and sends to line discipline. |
| 136 | * Sends input buffer data to the line discipline. |
| 137 | * |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 138 | */ |
| 139 | static void dgrp_input(struct ch_struct *ch) |
| 140 | { |
| 141 | struct nd_struct *nd; |
| 142 | struct tty_struct *tty; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 143 | int data_len; |
| 144 | int len; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 145 | int tty_count; |
| 146 | ulong lock_flags; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 147 | u8 *myflipbuf; |
| 148 | u8 *myflipflagbuf; |
| 149 | |
| 150 | if (!ch) |
| 151 | return; |
| 152 | |
| 153 | nd = ch->ch_nd; |
| 154 | |
| 155 | if (!nd) |
| 156 | return; |
| 157 | |
| 158 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 159 | |
| 160 | myflipbuf = nd->nd_inputbuf; |
| 161 | myflipflagbuf = nd->nd_inputflagbuf; |
| 162 | |
| 163 | if (!ch->ch_open_count) { |
| 164 | ch->ch_rout = ch->ch_rin; |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | if (ch->ch_tun.un_flag & UN_CLOSING) { |
| 169 | ch->ch_rout = ch->ch_rin; |
| 170 | goto out; |
| 171 | } |
| 172 | |
| 173 | tty = (ch->ch_tun).un_tty; |
| 174 | |
| 175 | |
| 176 | if (!tty || tty->magic != TTY_MAGIC) { |
| 177 | ch->ch_rout = ch->ch_rin; |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | tty_count = tty->count; |
| 182 | if (!tty_count) { |
| 183 | ch->ch_rout = ch->ch_rin; |
| 184 | goto out; |
| 185 | } |
| 186 | |
| 187 | if (tty->closing || test_bit(TTY_CLOSING, &tty->flags)) { |
| 188 | ch->ch_rout = ch->ch_rin; |
| 189 | goto out; |
| 190 | } |
| 191 | |
| 192 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 193 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 194 | /* data_len should be the number of chars that we read in */ |
| 195 | data_len = (ch->ch_rin - ch->ch_rout) & RBUF_MASK; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 196 | |
| 197 | /* len is the amount of data we are going to transfer here */ |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 198 | len = tty_buffer_request_room(&ch->port, data_len); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 199 | |
| 200 | /* Check DPA flow control */ |
| 201 | if ((nd->nd_dpa_debug) && |
| 202 | (nd->nd_dpa_flag & DPA_WAIT_SPACE) && |
| 203 | (nd->nd_dpa_port == MINOR(tty_devnum(ch->ch_tun.un_tty)))) |
| 204 | len = 0; |
| 205 | |
| 206 | if ((len) && !(ch->ch_flag & CH_RXSTOP)) { |
| 207 | |
| 208 | dgrp_read_data_block(ch, myflipbuf, len); |
| 209 | |
Bill Pemberton | e322411 | 2012-10-25 12:46:21 -0400 | [diff] [blame] | 210 | if (I_PARMRK(tty) || I_BRKINT(tty) || I_INPCK(tty)) |
| 211 | parity_scan(ch, myflipbuf, myflipflagbuf, &len); |
| 212 | else |
| 213 | memset(myflipflagbuf, TTY_NORMAL, len); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 214 | |
| 215 | if ((nd->nd_dpa_debug) && |
| 216 | (nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(tty))))) |
| 217 | dgrp_dpa_data(nd, 1, myflipbuf, len); |
| 218 | |
Jiri Slaby | 2f69335 | 2013-01-03 15:53:02 +0100 | [diff] [blame] | 219 | tty_insert_flip_string_flags(&ch->port, myflipbuf, |
Bill Pemberton | e322411 | 2012-10-25 12:46:21 -0400 | [diff] [blame] | 220 | myflipflagbuf, len); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 221 | tty_flip_buffer_push(&ch->port); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 222 | |
| 223 | ch->ch_rxcount += len; |
| 224 | } |
| 225 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 226 | /* |
| 227 | * Wake up any sleepers (maybe dgrp close) that might be waiting |
| 228 | * for a channel flag state change. |
| 229 | */ |
| 230 | wake_up_interruptible(&ch->ch_flag_wait); |
| 231 | return; |
| 232 | |
| 233 | out: |
| 234 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 235 | } |
| 236 | |
| 237 | |
| 238 | /* |
| 239 | * parity_scan |
| 240 | * |
| 241 | * Loop to inspect each single character or 0xFF escape. |
| 242 | * |
| 243 | * if PARMRK & ~DOSMODE: |
| 244 | * 0xFF 0xFF Normal 0xFF character, escaped |
| 245 | * to eliminate confusion. |
| 246 | * 0xFF 0x00 0x00 Break |
| 247 | * 0xFF 0x00 CC Error character CC. |
| 248 | * CC Normal character CC. |
| 249 | * |
| 250 | * if PARMRK & DOSMODE: |
| 251 | * 0xFF 0x18 0x00 Break |
| 252 | * 0xFF 0x08 0x00 Framing Error |
| 253 | * 0xFF 0x04 0x00 Parity error |
| 254 | * 0xFF 0x0C 0x00 Both Framing and Parity error |
| 255 | * |
| 256 | * TODO: do we need to do the XMODEM, XOFF, XON, XANY processing?? |
| 257 | * as per protocol |
| 258 | */ |
| 259 | static void parity_scan(struct ch_struct *ch, unsigned char *cbuf, |
| 260 | unsigned char *fbuf, int *len) |
| 261 | { |
| 262 | int l = *len; |
| 263 | int count = 0; |
| 264 | int DOS = ((ch->ch_iflag & IF_DOSMODE) == 0 ? 0 : 1); |
| 265 | unsigned char *cout; /* character buffer */ |
| 266 | unsigned char *fout; /* flag buffer */ |
| 267 | unsigned char *in; |
| 268 | unsigned char c; |
| 269 | |
| 270 | in = cbuf; |
| 271 | cout = cbuf; |
| 272 | fout = fbuf; |
| 273 | |
| 274 | while (l--) { |
| 275 | c = *in; |
| 276 | in++; |
| 277 | |
| 278 | switch (ch->ch_pscan_state) { |
| 279 | default: |
| 280 | /* reset to sanity and fall through */ |
Tülin İzer | 405c91f | 2013-05-11 05:00:33 +0300 | [diff] [blame] | 281 | ch->ch_pscan_state = 0; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 282 | |
| 283 | case 0: |
| 284 | /* No FF seen yet */ |
| 285 | if (c == 0xff) /* delete this character from stream */ |
| 286 | ch->ch_pscan_state = 1; |
| 287 | else { |
| 288 | *cout++ = c; |
| 289 | *fout++ = TTY_NORMAL; |
| 290 | count += 1; |
| 291 | } |
| 292 | break; |
| 293 | |
| 294 | case 1: |
| 295 | /* first FF seen */ |
| 296 | if (c == 0xff) { |
| 297 | /* doubled ff, transform to single ff */ |
| 298 | *cout++ = c; |
| 299 | *fout++ = TTY_NORMAL; |
| 300 | count += 1; |
| 301 | ch->ch_pscan_state = 0; |
| 302 | } else { |
| 303 | /* save value examination in next state */ |
| 304 | ch->ch_pscan_savechar = c; |
| 305 | ch->ch_pscan_state = 2; |
| 306 | } |
| 307 | break; |
| 308 | |
| 309 | case 2: |
| 310 | /* third character of ff sequence */ |
| 311 | *cout++ = c; |
| 312 | if (DOS) { |
| 313 | if (ch->ch_pscan_savechar & 0x10) |
| 314 | *fout++ = TTY_BREAK; |
| 315 | else if (ch->ch_pscan_savechar & 0x08) |
| 316 | *fout++ = TTY_FRAME; |
| 317 | else |
| 318 | /* |
| 319 | * either marked as a parity error, |
| 320 | * indeterminate, or not in DOSMODE |
| 321 | * call it a parity error |
| 322 | */ |
| 323 | *fout++ = TTY_PARITY; |
| 324 | } else { |
| 325 | /* case FF XX ?? where XX is not 00 */ |
| 326 | if (ch->ch_pscan_savechar & 0xff) { |
| 327 | /* this should not happen */ |
| 328 | pr_info("%s: parity_scan: error unexpected byte\n", |
| 329 | __func__); |
| 330 | *fout++ = TTY_PARITY; |
| 331 | } |
| 332 | /* case FF 00 XX where XX is not 00 */ |
| 333 | else if (c == 0xff) |
| 334 | *fout++ = TTY_PARITY; |
| 335 | /* case FF 00 00 */ |
| 336 | else |
| 337 | *fout++ = TTY_BREAK; |
| 338 | |
| 339 | } |
| 340 | count += 1; |
| 341 | ch->ch_pscan_state = 0; |
| 342 | } |
| 343 | } |
| 344 | *len = count; |
| 345 | } |
| 346 | |
| 347 | |
| 348 | /** |
| 349 | * dgrp_net_idle() -- Idle the network connection |
| 350 | * @nd: pointer to node structure to idle |
| 351 | */ |
| 352 | static void dgrp_net_idle(struct nd_struct *nd) |
| 353 | { |
| 354 | struct ch_struct *ch; |
| 355 | int i; |
| 356 | |
| 357 | nd->nd_tx_work = 1; |
| 358 | |
| 359 | nd->nd_state = NS_IDLE; |
| 360 | nd->nd_flag = 0; |
| 361 | |
| 362 | for (i = nd->nd_seq_out; ; i = (i + 1) & SEQ_MASK) { |
| 363 | if (!nd->nd_seq_wait[i]) { |
| 364 | nd->nd_seq_wait[i] = 0; |
| 365 | wake_up_interruptible(&nd->nd_seq_wque[i]); |
| 366 | } |
| 367 | |
| 368 | if (i == nd->nd_seq_in) |
| 369 | break; |
| 370 | } |
| 371 | |
| 372 | nd->nd_seq_out = nd->nd_seq_in; |
| 373 | |
| 374 | nd->nd_unack = 0; |
| 375 | nd->nd_remain = 0; |
| 376 | |
| 377 | nd->nd_tx_module = 0x10; |
| 378 | nd->nd_rx_module = 0x00; |
| 379 | |
| 380 | for (i = 0, ch = nd->nd_chan; i < CHAN_MAX; i++, ch++) { |
| 381 | ch->ch_state = CS_IDLE; |
| 382 | |
| 383 | ch->ch_otype = 0; |
| 384 | ch->ch_otype_waiting = 0; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * Increase the number of channels, waking up any |
| 390 | * threads that might be waiting for the channels |
| 391 | * to appear. |
| 392 | */ |
| 393 | static void increase_channel_count(struct nd_struct *nd, int n) |
| 394 | { |
| 395 | struct ch_struct *ch; |
| 396 | struct device *classp; |
| 397 | char name[DEVICE_NAME_SIZE]; |
| 398 | int ret; |
| 399 | u8 *buf; |
| 400 | int i; |
| 401 | |
| 402 | for (i = nd->nd_chan_count; i < n; ++i) { |
| 403 | ch = nd->nd_chan + i; |
| 404 | |
| 405 | /* FIXME: return a useful error instead! */ |
| 406 | buf = kmalloc(TBUF_MAX, GFP_KERNEL); |
| 407 | if (!buf) |
| 408 | return; |
| 409 | |
| 410 | if (ch->ch_tbuf) |
| 411 | pr_info_ratelimited("%s - ch_tbuf was not NULL\n", |
| 412 | __func__); |
| 413 | |
| 414 | ch->ch_tbuf = buf; |
| 415 | |
| 416 | buf = kmalloc(RBUF_MAX, GFP_KERNEL); |
| 417 | if (!buf) |
| 418 | return; |
| 419 | |
| 420 | if (ch->ch_rbuf) |
| 421 | pr_info("%s - ch_rbuf was not NULL\n", |
| 422 | __func__); |
| 423 | ch->ch_rbuf = buf; |
| 424 | |
| 425 | classp = tty_port_register_device(&ch->port, |
| 426 | nd->nd_serial_ttdriver, i, |
| 427 | NULL); |
| 428 | |
| 429 | ch->ch_tun.un_sysfs = classp; |
| 430 | snprintf(name, DEVICE_NAME_SIZE, "tty_%d", i); |
| 431 | |
| 432 | dgrp_create_tty_sysfs(&ch->ch_tun, classp); |
| 433 | ret = sysfs_create_link(&nd->nd_class_dev->kobj, |
| 434 | &classp->kobj, name); |
| 435 | |
| 436 | /* NOTE: We don't support "cu" devices anymore, |
| 437 | * so you will notice we don't register them |
| 438 | * here anymore. */ |
| 439 | if (dgrp_register_prdevices) { |
| 440 | classp = tty_register_device(nd->nd_xprint_ttdriver, |
| 441 | i, NULL); |
| 442 | ch->ch_pun.un_sysfs = classp; |
| 443 | snprintf(name, DEVICE_NAME_SIZE, "pr_%d", i); |
| 444 | |
| 445 | dgrp_create_tty_sysfs(&ch->ch_pun, classp); |
| 446 | ret = sysfs_create_link(&nd->nd_class_dev->kobj, |
| 447 | &classp->kobj, name); |
| 448 | } |
| 449 | |
| 450 | nd->nd_chan_count = i + 1; |
| 451 | wake_up_interruptible(&ch->ch_flag_wait); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Decrease the number of channels, and wake up any threads that might |
| 457 | * be waiting on the channels that vanished. |
| 458 | */ |
| 459 | static void decrease_channel_count(struct nd_struct *nd, int n) |
| 460 | { |
| 461 | struct ch_struct *ch; |
| 462 | char name[DEVICE_NAME_SIZE]; |
| 463 | int i; |
| 464 | |
| 465 | for (i = nd->nd_chan_count - 1; i >= n; --i) { |
| 466 | ch = nd->nd_chan + i; |
| 467 | |
| 468 | /* |
| 469 | * Make any open ports inoperative. |
| 470 | */ |
| 471 | ch->ch_state = CS_IDLE; |
| 472 | |
| 473 | ch->ch_otype = 0; |
| 474 | ch->ch_otype_waiting = 0; |
| 475 | |
| 476 | /* |
| 477 | * Only "HANGUP" if we care about carrier |
| 478 | * transitions and we are already open. |
| 479 | */ |
| 480 | if (ch->ch_open_count != 0) { |
| 481 | ch->ch_flag |= CH_HANGUP; |
| 482 | dgrp_carrier(ch); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Unlike the CH_HANGUP flag above, use another |
| 487 | * flag to indicate to the RealPort state machine |
| 488 | * that this port has disappeared. |
| 489 | */ |
| 490 | if (ch->ch_open_count != 0) |
| 491 | ch->ch_flag |= CH_PORT_GONE; |
| 492 | |
| 493 | wake_up_interruptible(&ch->ch_flag_wait); |
| 494 | |
| 495 | nd->nd_chan_count = i; |
| 496 | |
| 497 | kfree(ch->ch_tbuf); |
| 498 | ch->ch_tbuf = NULL; |
| 499 | |
| 500 | kfree(ch->ch_rbuf); |
| 501 | ch->ch_rbuf = NULL; |
| 502 | |
| 503 | nd->nd_chan_count = i; |
| 504 | |
| 505 | dgrp_remove_tty_sysfs(ch->ch_tun.un_sysfs); |
| 506 | snprintf(name, DEVICE_NAME_SIZE, "tty_%d", i); |
| 507 | sysfs_remove_link(&nd->nd_class_dev->kobj, name); |
| 508 | tty_unregister_device(nd->nd_serial_ttdriver, i); |
| 509 | |
| 510 | /* |
| 511 | * NOTE: We don't support "cu" devices anymore, so don't |
| 512 | * unregister them here anymore. |
| 513 | */ |
| 514 | |
| 515 | if (dgrp_register_prdevices) { |
| 516 | dgrp_remove_tty_sysfs(ch->ch_pun.un_sysfs); |
| 517 | snprintf(name, DEVICE_NAME_SIZE, "pr_%d", i); |
| 518 | sysfs_remove_link(&nd->nd_class_dev->kobj, name); |
| 519 | tty_unregister_device(nd->nd_xprint_ttdriver, i); |
| 520 | } |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * dgrp_chan_count() -- Adjust the node channel count. |
| 526 | * @nd: pointer to a node structure |
| 527 | * @n: new value for channel count |
| 528 | * |
| 529 | * Adjusts the node channel count. If new ports have appeared, it tries |
| 530 | * to signal those processes that might have been waiting for ports to |
| 531 | * appear. If ports have disappeared it tries to signal those processes |
| 532 | * that might be hung waiting for a response for the now non-existant port. |
| 533 | */ |
| 534 | static void dgrp_chan_count(struct nd_struct *nd, int n) |
| 535 | { |
| 536 | if (n == nd->nd_chan_count) |
| 537 | return; |
| 538 | |
| 539 | if (n > nd->nd_chan_count) |
| 540 | increase_channel_count(nd, n); |
| 541 | |
| 542 | if (n < nd->nd_chan_count) |
| 543 | decrease_channel_count(nd, n); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * dgrp_monitor() -- send data to the device monitor queue |
| 548 | * @nd: pointer to a node structure |
| 549 | * @buf: data to copy to the monitoring buffer |
| 550 | * @len: number of bytes to transfer to the buffer |
| 551 | * |
| 552 | * Called by the net device routines to send data to the device |
| 553 | * monitor queue. If the device monitor buffer is too full to |
| 554 | * accept the data, it waits until the buffer is ready. |
| 555 | */ |
| 556 | static void dgrp_monitor(struct nd_struct *nd, u8 *buf, int len) |
| 557 | { |
| 558 | int n; |
| 559 | int r; |
| 560 | int rtn; |
| 561 | |
| 562 | /* |
| 563 | * Grab monitor lock. |
| 564 | */ |
| 565 | down(&nd->nd_mon_semaphore); |
| 566 | |
| 567 | /* |
| 568 | * Loop while data remains. |
| 569 | */ |
| 570 | while ((len > 0) && (nd->nd_mon_buf)) { |
| 571 | /* |
| 572 | * Determine the amount of available space left in the |
| 573 | * buffer. If there's none, wait until some appears. |
| 574 | */ |
| 575 | |
| 576 | n = (nd->nd_mon_out - nd->nd_mon_in - 1) & MON_MASK; |
| 577 | |
| 578 | if (!n) { |
| 579 | nd->nd_mon_flag |= MON_WAIT_SPACE; |
| 580 | |
| 581 | up(&nd->nd_mon_semaphore); |
| 582 | |
| 583 | /* |
| 584 | * Go to sleep waiting until the condition becomes true. |
| 585 | */ |
| 586 | rtn = wait_event_interruptible(nd->nd_mon_wqueue, |
| 587 | ((nd->nd_mon_flag & MON_WAIT_SPACE) == 0)); |
| 588 | |
| 589 | /* FIXME: really ignore rtn? */ |
| 590 | |
| 591 | /* |
| 592 | * We can't exit here if we receive a signal, since |
| 593 | * to do so would trash the debug stream. |
| 594 | */ |
| 595 | |
| 596 | down(&nd->nd_mon_semaphore); |
| 597 | |
| 598 | continue; |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * Copy as much data as will fit. |
| 603 | */ |
| 604 | |
| 605 | if (n > len) |
| 606 | n = len; |
| 607 | |
| 608 | r = MON_MAX - nd->nd_mon_in; |
| 609 | |
| 610 | if (r <= n) { |
| 611 | memcpy(nd->nd_mon_buf + nd->nd_mon_in, buf, r); |
| 612 | |
| 613 | n -= r; |
| 614 | |
| 615 | nd->nd_mon_in = 0; |
| 616 | |
| 617 | buf += r; |
| 618 | len -= r; |
| 619 | } |
| 620 | |
| 621 | memcpy(nd->nd_mon_buf + nd->nd_mon_in, buf, n); |
| 622 | |
| 623 | nd->nd_mon_in += n; |
| 624 | |
| 625 | buf += n; |
| 626 | len -= n; |
| 627 | |
| 628 | if (nd->nd_mon_in >= MON_MAX) |
| 629 | pr_info_ratelimited("%s - nd_mon_in (%i) >= MON_MAX\n", |
| 630 | __func__, nd->nd_mon_in); |
| 631 | |
| 632 | /* |
| 633 | * Wakeup any thread waiting for data |
| 634 | */ |
| 635 | |
| 636 | if (nd->nd_mon_flag & MON_WAIT_DATA) { |
| 637 | nd->nd_mon_flag &= ~MON_WAIT_DATA; |
| 638 | wake_up_interruptible(&nd->nd_mon_wqueue); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Release the monitor lock. |
| 644 | */ |
| 645 | up(&nd->nd_mon_semaphore); |
| 646 | } |
| 647 | |
| 648 | /** |
| 649 | * dgrp_encode_time() -- Encodes rpdump time into a 4-byte quantity. |
| 650 | * @nd: pointer to a node structure |
| 651 | * @buf: destination buffer |
| 652 | * |
| 653 | * Encodes "rpdump" time into a 4-byte quantity. Time is measured since |
| 654 | * open. |
| 655 | */ |
| 656 | static void dgrp_encode_time(struct nd_struct *nd, u8 *buf) |
| 657 | { |
| 658 | ulong t; |
| 659 | |
| 660 | /* |
| 661 | * Convert time in HZ since open to time in milliseconds |
| 662 | * since open. |
| 663 | */ |
| 664 | t = jiffies - nd->nd_mon_lbolt; |
| 665 | t = 1000 * (t / HZ) + 1000 * (t % HZ) / HZ; |
| 666 | |
| 667 | put_unaligned_be32((uint)(t & 0xffffffff), buf); |
| 668 | } |
| 669 | |
| 670 | |
| 671 | |
| 672 | /** |
| 673 | * dgrp_monitor_message() -- Builds a rpdump style message. |
| 674 | * @nd: pointer to a node structure |
| 675 | * @message: destination buffer |
| 676 | */ |
| 677 | static void dgrp_monitor_message(struct nd_struct *nd, char *message) |
| 678 | { |
| 679 | u8 header[7]; |
| 680 | int n; |
| 681 | |
| 682 | header[0] = RPDUMP_MESSAGE; |
| 683 | |
| 684 | dgrp_encode_time(nd, header + 1); |
| 685 | |
| 686 | n = strlen(message); |
| 687 | |
| 688 | put_unaligned_be16(n, header + 5); |
| 689 | |
| 690 | dgrp_monitor(nd, header, sizeof(header)); |
| 691 | dgrp_monitor(nd, (u8 *) message, n); |
| 692 | } |
| 693 | |
| 694 | |
| 695 | |
| 696 | /** |
| 697 | * dgrp_monitor_reset() -- Note a reset in the monitoring buffer. |
| 698 | * @nd: pointer to a node structure |
| 699 | */ |
| 700 | static void dgrp_monitor_reset(struct nd_struct *nd) |
| 701 | { |
| 702 | u8 header[5]; |
| 703 | |
| 704 | header[0] = RPDUMP_RESET; |
| 705 | |
| 706 | dgrp_encode_time(nd, header + 1); |
| 707 | |
| 708 | dgrp_monitor(nd, header, sizeof(header)); |
| 709 | } |
| 710 | |
| 711 | /** |
| 712 | * dgrp_monitor_data() -- builds a monitor data packet |
| 713 | * @nd: pointer to a node structure |
| 714 | * @type: type of message to be logged |
| 715 | * @buf: data to be logged |
| 716 | * @size: number of bytes in the buffer |
| 717 | */ |
| 718 | static void dgrp_monitor_data(struct nd_struct *nd, u8 type, u8 *buf, int size) |
| 719 | { |
| 720 | u8 header[7]; |
| 721 | |
| 722 | header[0] = type; |
| 723 | |
| 724 | dgrp_encode_time(nd, header + 1); |
| 725 | |
| 726 | put_unaligned_be16(size, header + 5); |
| 727 | |
| 728 | dgrp_monitor(nd, header, sizeof(header)); |
| 729 | dgrp_monitor(nd, buf, size); |
| 730 | } |
| 731 | |
| 732 | static int alloc_nd_buffers(struct nd_struct *nd) |
| 733 | { |
| 734 | |
| 735 | nd->nd_iobuf = NULL; |
| 736 | nd->nd_writebuf = NULL; |
| 737 | nd->nd_inputbuf = NULL; |
| 738 | nd->nd_inputflagbuf = NULL; |
| 739 | |
| 740 | /* |
| 741 | * Allocate the network read/write buffer. |
| 742 | */ |
| 743 | nd->nd_iobuf = kzalloc(UIO_MAX + 10, GFP_KERNEL); |
| 744 | if (!nd->nd_iobuf) |
| 745 | goto out_err; |
| 746 | |
| 747 | /* |
| 748 | * Allocate a buffer for doing the copy from user space to |
| 749 | * kernel space in the write routines. |
| 750 | */ |
| 751 | nd->nd_writebuf = kzalloc(WRITEBUFLEN, GFP_KERNEL); |
| 752 | if (!nd->nd_writebuf) |
| 753 | goto out_err; |
| 754 | |
| 755 | /* |
| 756 | * Allocate a buffer for doing the copy from kernel space to |
| 757 | * tty buffer space in the read routines. |
| 758 | */ |
| 759 | nd->nd_inputbuf = kzalloc(MYFLIPLEN, GFP_KERNEL); |
| 760 | if (!nd->nd_inputbuf) |
| 761 | goto out_err; |
| 762 | |
| 763 | /* |
| 764 | * Allocate a buffer for doing the copy from kernel space to |
| 765 | * tty buffer space in the read routines. |
| 766 | */ |
| 767 | nd->nd_inputflagbuf = kzalloc(MYFLIPLEN, GFP_KERNEL); |
| 768 | if (!nd->nd_inputflagbuf) |
| 769 | goto out_err; |
| 770 | |
| 771 | return 0; |
| 772 | |
| 773 | out_err: |
| 774 | kfree(nd->nd_iobuf); |
| 775 | kfree(nd->nd_writebuf); |
| 776 | kfree(nd->nd_inputbuf); |
| 777 | kfree(nd->nd_inputflagbuf); |
| 778 | return -ENOMEM; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * dgrp_net_open() -- Open the NET device for a particular PortServer |
| 783 | */ |
| 784 | static int dgrp_net_open(struct inode *inode, struct file *file) |
| 785 | { |
| 786 | struct nd_struct *nd; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 787 | ulong lock_flags; |
| 788 | int rtn; |
| 789 | |
| 790 | rtn = try_module_get(THIS_MODULE); |
| 791 | if (!rtn) |
| 792 | return -EAGAIN; |
| 793 | |
| 794 | if (!capable(CAP_SYS_ADMIN)) { |
| 795 | rtn = -EPERM; |
| 796 | goto done; |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Make sure that the "private_data" field hasn't already been used. |
| 801 | */ |
| 802 | if (file->private_data) { |
| 803 | rtn = -EINVAL; |
| 804 | goto done; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Get the node pointer, and fail if it doesn't exist. |
| 809 | */ |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 810 | nd = PDE_DATA(inode); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 811 | if (!nd) { |
| 812 | rtn = -ENXIO; |
| 813 | goto done; |
| 814 | } |
| 815 | |
| 816 | file->private_data = (void *) nd; |
| 817 | |
| 818 | /* |
| 819 | * Grab the NET lock. |
| 820 | */ |
| 821 | down(&nd->nd_net_semaphore); |
| 822 | |
| 823 | if (nd->nd_state != NS_CLOSED) { |
| 824 | rtn = -EBUSY; |
| 825 | goto unlock; |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * Initialize the link speed parameters. |
| 830 | */ |
| 831 | |
| 832 | nd->nd_link.lk_fast_rate = UIO_MAX; |
| 833 | nd->nd_link.lk_slow_rate = UIO_MAX; |
| 834 | |
| 835 | nd->nd_link.lk_fast_delay = 1000; |
| 836 | nd->nd_link.lk_slow_delay = 1000; |
| 837 | |
| 838 | nd->nd_link.lk_header_size = 46; |
| 839 | |
| 840 | |
| 841 | rtn = alloc_nd_buffers(nd); |
| 842 | if (rtn) |
| 843 | goto unlock; |
| 844 | |
| 845 | /* |
| 846 | * The port is now open, so move it to the IDLE state |
| 847 | */ |
| 848 | dgrp_net_idle(nd); |
| 849 | |
| 850 | nd->nd_tx_time = jiffies; |
| 851 | |
| 852 | /* |
| 853 | * If the polling routing is not running, start it running here |
| 854 | */ |
| 855 | spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags); |
| 856 | |
| 857 | if (!dgrp_poll_data.node_active_count) { |
| 858 | dgrp_poll_data.node_active_count = 2; |
| 859 | dgrp_poll_data.timer.expires = jiffies + |
| 860 | dgrp_poll_tick * HZ / 1000; |
| 861 | add_timer(&dgrp_poll_data.timer); |
| 862 | } |
| 863 | |
| 864 | spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags); |
| 865 | |
| 866 | dgrp_monitor_message(nd, "Net Open"); |
| 867 | |
| 868 | unlock: |
| 869 | /* |
| 870 | * Release the NET lock. |
| 871 | */ |
| 872 | up(&nd->nd_net_semaphore); |
| 873 | |
| 874 | done: |
| 875 | if (rtn) |
| 876 | module_put(THIS_MODULE); |
| 877 | |
| 878 | return rtn; |
| 879 | } |
| 880 | |
| 881 | /* dgrp_net_release() -- close the NET device for a particular PortServer */ |
| 882 | static int dgrp_net_release(struct inode *inode, struct file *file) |
| 883 | { |
| 884 | struct nd_struct *nd; |
| 885 | ulong lock_flags; |
| 886 | |
| 887 | nd = (struct nd_struct *)(file->private_data); |
| 888 | if (!nd) |
| 889 | goto done; |
| 890 | |
| 891 | /* TODO : historical locking placeholder */ |
| 892 | /* |
| 893 | * In the HPUX version of the RealPort driver (which served as a basis |
| 894 | * for this driver) this locking code was used. Saved if ever we need |
| 895 | * to review the locking under Linux. |
| 896 | */ |
| 897 | /* spinlock(&nd->nd_lock); */ |
| 898 | |
| 899 | |
| 900 | /* |
| 901 | * Grab the NET lock. |
| 902 | */ |
| 903 | down(&nd->nd_net_semaphore); |
| 904 | |
| 905 | /* |
| 906 | * Before "closing" the internal connection, make sure all |
| 907 | * ports are "idle". |
| 908 | */ |
| 909 | dgrp_net_idle(nd); |
| 910 | |
| 911 | nd->nd_state = NS_CLOSED; |
| 912 | nd->nd_flag = 0; |
| 913 | |
| 914 | /* |
| 915 | * TODO ... must the wait queue be reset on close? |
| 916 | * should any pending waiters be reset? |
| 917 | * Let's decide to assert that the waitq is empty... and see |
| 918 | * how soon we break. |
| 919 | */ |
| 920 | if (waitqueue_active(&nd->nd_tx_waitq)) |
| 921 | pr_info("%s - expected waitqueue_active to be false\n", |
| 922 | __func__); |
| 923 | |
| 924 | nd->nd_send = 0; |
| 925 | |
| 926 | kfree(nd->nd_iobuf); |
| 927 | nd->nd_iobuf = NULL; |
| 928 | |
| 929 | /* TODO : historical locking placeholder */ |
| 930 | /* |
| 931 | * In the HPUX version of the RealPort driver (which served as a basis |
| 932 | * for this driver) this locking code was used. Saved if ever we need |
| 933 | * to review the locking under Linux. |
| 934 | */ |
| 935 | /* spinunlock( &nd->nd_lock ); */ |
| 936 | |
| 937 | |
| 938 | kfree(nd->nd_writebuf); |
| 939 | nd->nd_writebuf = NULL; |
| 940 | |
| 941 | kfree(nd->nd_inputbuf); |
| 942 | nd->nd_inputbuf = NULL; |
| 943 | |
| 944 | kfree(nd->nd_inputflagbuf); |
| 945 | nd->nd_inputflagbuf = NULL; |
| 946 | |
| 947 | /* TODO : historical locking placeholder */ |
| 948 | /* |
| 949 | * In the HPUX version of the RealPort driver (which served as a basis |
| 950 | * for this driver) this locking code was used. Saved if ever we need |
| 951 | * to review the locking under Linux. |
| 952 | */ |
| 953 | /* spinlock(&nd->nd_lock); */ |
| 954 | |
| 955 | /* |
| 956 | * Set the active port count to zero. |
| 957 | */ |
| 958 | dgrp_chan_count(nd, 0); |
| 959 | |
| 960 | /* TODO : historical locking placeholder */ |
| 961 | /* |
| 962 | * In the HPUX version of the RealPort driver (which served as a basis |
| 963 | * for this driver) this locking code was used. Saved if ever we need |
| 964 | * to review the locking under Linux. |
| 965 | */ |
| 966 | /* spinunlock(&nd->nd_lock); */ |
| 967 | |
| 968 | /* |
| 969 | * Release the NET lock. |
| 970 | */ |
| 971 | up(&nd->nd_net_semaphore); |
| 972 | |
| 973 | /* |
| 974 | * Cause the poller to stop scheduling itself if this is |
| 975 | * the last active node. |
| 976 | */ |
| 977 | spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags); |
| 978 | |
| 979 | if (dgrp_poll_data.node_active_count == 2) { |
| 980 | del_timer(&dgrp_poll_data.timer); |
| 981 | dgrp_poll_data.node_active_count = 0; |
| 982 | } |
| 983 | |
| 984 | spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags); |
| 985 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 986 | down(&nd->nd_net_semaphore); |
| 987 | |
| 988 | dgrp_monitor_message(nd, "Net Close"); |
| 989 | |
| 990 | up(&nd->nd_net_semaphore); |
| 991 | |
Yuanhan Liu | 7defac3 | 2012-10-29 13:50:37 +0800 | [diff] [blame] | 992 | done: |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 993 | module_put(THIS_MODULE); |
| 994 | file->private_data = NULL; |
| 995 | return 0; |
| 996 | } |
| 997 | |
| 998 | /* used in dgrp_send to setup command header */ |
| 999 | static inline u8 *set_cmd_header(u8 *b, u8 port, u8 cmd) |
| 1000 | { |
| 1001 | *b++ = 0xb0 + (port & 0x0f); |
| 1002 | *b++ = cmd; |
| 1003 | return b; |
| 1004 | } |
| 1005 | |
| 1006 | /** |
| 1007 | * dgrp_send() -- build a packet for transmission to the server |
| 1008 | * @nd: pointer to a node structure |
| 1009 | * @tmax: maximum bytes to transmit |
| 1010 | * |
| 1011 | * returns number of bytes sent |
| 1012 | */ |
| 1013 | static int dgrp_send(struct nd_struct *nd, long tmax) |
| 1014 | { |
| 1015 | struct ch_struct *ch = nd->nd_chan; |
| 1016 | u8 *b; |
| 1017 | u8 *buf; |
| 1018 | u8 *mbuf; |
| 1019 | u8 port; |
| 1020 | int mod; |
| 1021 | long send; |
| 1022 | int maxport; |
| 1023 | long lastport = -1; |
| 1024 | ushort rwin; |
| 1025 | long in; |
| 1026 | ushort n; |
| 1027 | long t; |
| 1028 | long ttotal; |
| 1029 | long tchan; |
| 1030 | long tsend; |
| 1031 | ushort tsafe; |
| 1032 | long work; |
| 1033 | long send_sync; |
| 1034 | long wanted_sync_port = -1; |
| 1035 | ushort tdata[CHAN_MAX]; |
| 1036 | long used_buffer; |
| 1037 | |
| 1038 | mbuf = nd->nd_iobuf + UIO_BASE; |
| 1039 | buf = b = mbuf; |
| 1040 | |
| 1041 | send_sync = nd->nd_link.lk_slow_rate < UIO_MAX; |
| 1042 | |
| 1043 | ttotal = 0; |
| 1044 | tchan = 0; |
| 1045 | |
| 1046 | memset(tdata, 0, sizeof(tdata)); |
| 1047 | |
| 1048 | |
| 1049 | /* |
| 1050 | * If there are any outstanding requests to be serviced, |
| 1051 | * service them here. |
| 1052 | */ |
| 1053 | if (nd->nd_send & NR_PASSWORD) { |
| 1054 | |
| 1055 | /* |
| 1056 | * Send Password response. |
| 1057 | */ |
| 1058 | |
| 1059 | b[0] = 0xfc; |
| 1060 | b[1] = 0x20; |
| 1061 | put_unaligned_be16(strlen(nd->password), b + 2); |
| 1062 | b += 4; |
| 1063 | b += strlen(nd->password); |
| 1064 | nd->nd_send &= ~(NR_PASSWORD); |
| 1065 | } |
| 1066 | |
| 1067 | |
| 1068 | /* |
| 1069 | * Loop over all modules to generate commands, and determine |
| 1070 | * the amount of data queued for transmit. |
| 1071 | */ |
| 1072 | |
| 1073 | for (mod = 0, port = 0; port < nd->nd_chan_count; mod++) { |
| 1074 | /* |
| 1075 | * If this is not the current module, enter a module select |
| 1076 | * code in the buffer. |
| 1077 | */ |
| 1078 | |
| 1079 | if (mod != nd->nd_tx_module) |
| 1080 | mbuf = ++b; |
| 1081 | |
| 1082 | /* |
| 1083 | * Loop to process one module. |
| 1084 | */ |
| 1085 | |
| 1086 | maxport = port + 16; |
| 1087 | |
| 1088 | if (maxport > nd->nd_chan_count) |
| 1089 | maxport = nd->nd_chan_count; |
| 1090 | |
| 1091 | for (; port < maxport; port++, ch++) { |
| 1092 | /* |
| 1093 | * Switch based on channel state. |
| 1094 | */ |
| 1095 | |
| 1096 | switch (ch->ch_state) { |
| 1097 | /* |
| 1098 | * Send requests when the port is closed, and there |
| 1099 | * are no Open, Close or Cancel requests expected. |
| 1100 | */ |
| 1101 | |
| 1102 | case CS_IDLE: |
| 1103 | /* |
| 1104 | * Wait until any open error code |
| 1105 | * has been delivered to all |
| 1106 | * associated ports. |
| 1107 | */ |
| 1108 | |
| 1109 | if (ch->ch_open_error) { |
| 1110 | if (ch->ch_wait_count[ch->ch_otype]) { |
| 1111 | work = 1; |
| 1112 | break; |
| 1113 | } |
| 1114 | |
| 1115 | ch->ch_open_error = 0; |
| 1116 | } |
| 1117 | |
| 1118 | /* |
| 1119 | * Wait until the channel HANGUP flag is reset |
| 1120 | * before sending the first open. We can only |
| 1121 | * get to this state after a server disconnect. |
| 1122 | */ |
| 1123 | |
| 1124 | if ((ch->ch_flag & CH_HANGUP) != 0) |
| 1125 | break; |
| 1126 | |
| 1127 | /* |
| 1128 | * If recovering from a TCP disconnect, or if |
| 1129 | * there is an immediate open pending, send an |
| 1130 | * Immediate Open request. |
| 1131 | */ |
| 1132 | if ((ch->ch_flag & CH_PORT_GONE) || |
| 1133 | ch->ch_wait_count[OTYPE_IMMEDIATE] != 0) { |
| 1134 | b = set_cmd_header(b, port, 10); |
| 1135 | *b++ = 0; |
| 1136 | |
| 1137 | ch->ch_state = CS_WAIT_OPEN; |
| 1138 | ch->ch_otype = OTYPE_IMMEDIATE; |
| 1139 | break; |
| 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * If there is no Persistent or Incoming Open on the wait |
| 1144 | * list in the server, and a thread is waiting for a |
| 1145 | * Persistent or Incoming Open, send a Persistent or Incoming |
| 1146 | * Open Request. |
| 1147 | */ |
| 1148 | if (ch->ch_otype_waiting == 0) { |
| 1149 | if (ch->ch_wait_count[OTYPE_PERSISTENT] != 0) { |
| 1150 | b = set_cmd_header(b, port, 10); |
| 1151 | *b++ = 1; |
| 1152 | |
| 1153 | ch->ch_state = CS_WAIT_OPEN; |
| 1154 | ch->ch_otype = OTYPE_PERSISTENT; |
| 1155 | } else if (ch->ch_wait_count[OTYPE_INCOMING] != 0) { |
| 1156 | b = set_cmd_header(b, port, 10); |
| 1157 | *b++ = 2; |
| 1158 | |
| 1159 | ch->ch_state = CS_WAIT_OPEN; |
| 1160 | ch->ch_otype = OTYPE_INCOMING; |
| 1161 | } |
| 1162 | break; |
| 1163 | } |
| 1164 | |
| 1165 | /* |
| 1166 | * If a Persistent or Incoming Open is pending in |
| 1167 | * the server, but there is no longer an open |
| 1168 | * thread waiting for it, cancel the request. |
| 1169 | */ |
| 1170 | |
| 1171 | if (ch->ch_wait_count[ch->ch_otype_waiting] == 0) { |
| 1172 | b = set_cmd_header(b, port, 10); |
| 1173 | *b++ = 4; |
| 1174 | |
| 1175 | ch->ch_state = CS_WAIT_CANCEL; |
| 1176 | ch->ch_otype = ch->ch_otype_waiting; |
| 1177 | } |
| 1178 | break; |
| 1179 | |
| 1180 | /* |
| 1181 | * Send port parameter queries. |
| 1182 | */ |
| 1183 | case CS_SEND_QUERY: |
| 1184 | /* |
| 1185 | * Clear out all FEP state that might remain |
| 1186 | * from the last connection. |
| 1187 | */ |
| 1188 | |
| 1189 | ch->ch_flag |= CH_PARAM; |
| 1190 | |
| 1191 | ch->ch_flag &= ~CH_RX_FLUSH; |
| 1192 | |
| 1193 | ch->ch_expect = 0; |
| 1194 | |
| 1195 | ch->ch_s_tin = 0; |
| 1196 | ch->ch_s_tpos = 0; |
| 1197 | ch->ch_s_tsize = 0; |
| 1198 | ch->ch_s_treq = 0; |
| 1199 | ch->ch_s_elast = 0; |
| 1200 | |
| 1201 | ch->ch_s_rin = 0; |
| 1202 | ch->ch_s_rwin = 0; |
| 1203 | ch->ch_s_rsize = 0; |
| 1204 | |
| 1205 | ch->ch_s_tmax = 0; |
| 1206 | ch->ch_s_ttime = 0; |
| 1207 | ch->ch_s_rmax = 0; |
| 1208 | ch->ch_s_rtime = 0; |
| 1209 | ch->ch_s_rlow = 0; |
| 1210 | ch->ch_s_rhigh = 0; |
| 1211 | |
| 1212 | ch->ch_s_brate = 0; |
| 1213 | ch->ch_s_iflag = 0; |
| 1214 | ch->ch_s_cflag = 0; |
| 1215 | ch->ch_s_oflag = 0; |
| 1216 | ch->ch_s_xflag = 0; |
| 1217 | |
| 1218 | ch->ch_s_mout = 0; |
| 1219 | ch->ch_s_mflow = 0; |
| 1220 | ch->ch_s_mctrl = 0; |
| 1221 | ch->ch_s_xon = 0; |
| 1222 | ch->ch_s_xoff = 0; |
| 1223 | ch->ch_s_lnext = 0; |
| 1224 | ch->ch_s_xxon = 0; |
| 1225 | ch->ch_s_xxoff = 0; |
| 1226 | |
| 1227 | /* Send Sequence Request */ |
| 1228 | b = set_cmd_header(b, port, 14); |
| 1229 | |
| 1230 | /* Configure Event Conditions Packet */ |
| 1231 | b = set_cmd_header(b, port, 42); |
| 1232 | put_unaligned_be16(0x02c0, b); |
| 1233 | b += 2; |
| 1234 | *b++ = (DM_DTR | DM_RTS | DM_CTS | |
| 1235 | DM_DSR | DM_RI | DM_CD); |
| 1236 | |
| 1237 | /* Send Status Request */ |
| 1238 | b = set_cmd_header(b, port, 16); |
| 1239 | |
| 1240 | /* Send Buffer Request */ |
| 1241 | b = set_cmd_header(b, port, 20); |
| 1242 | |
| 1243 | /* Send Port Capability Request */ |
| 1244 | b = set_cmd_header(b, port, 22); |
| 1245 | |
| 1246 | ch->ch_expect = (RR_SEQUENCE | |
| 1247 | RR_STATUS | |
| 1248 | RR_BUFFER | |
| 1249 | RR_CAPABILITY); |
| 1250 | |
| 1251 | ch->ch_state = CS_WAIT_QUERY; |
| 1252 | |
| 1253 | /* Raise modem signals */ |
| 1254 | b = set_cmd_header(b, port, 44); |
| 1255 | |
| 1256 | if (ch->ch_flag & CH_PORT_GONE) |
| 1257 | ch->ch_s_mout = ch->ch_mout; |
| 1258 | else |
| 1259 | ch->ch_s_mout = ch->ch_mout = DM_DTR | DM_RTS; |
| 1260 | |
| 1261 | *b++ = ch->ch_mout; |
| 1262 | *b++ = ch->ch_s_mflow = 0; |
| 1263 | *b++ = ch->ch_s_mctrl = ch->ch_mctrl = 0; |
| 1264 | |
| 1265 | if (ch->ch_flag & CH_PORT_GONE) |
| 1266 | ch->ch_flag &= ~CH_PORT_GONE; |
| 1267 | |
| 1268 | break; |
| 1269 | |
| 1270 | /* |
| 1271 | * Handle normal open and ready mode. |
| 1272 | */ |
| 1273 | |
| 1274 | case CS_READY: |
| 1275 | |
| 1276 | /* |
| 1277 | * If the port is not open, and there are no |
| 1278 | * no longer any ports requesting an open, |
| 1279 | * then close the port. |
| 1280 | */ |
| 1281 | |
| 1282 | if (ch->ch_open_count == 0 && |
| 1283 | ch->ch_wait_count[ch->ch_otype] == 0) { |
| 1284 | goto send_close; |
| 1285 | } |
| 1286 | |
| 1287 | /* |
| 1288 | * Process waiting input. |
| 1289 | * |
| 1290 | * If there is no one to read it, discard the data. |
| 1291 | * |
| 1292 | * Otherwise if we are not in fastcook mode, or if there is a |
| 1293 | * fastcook thread waiting for data, send the data to the |
| 1294 | * line discipline. |
| 1295 | */ |
| 1296 | if (ch->ch_rin != ch->ch_rout) { |
| 1297 | if (ch->ch_tun.un_open_count == 0 || |
| 1298 | (ch->ch_tun.un_flag & UN_CLOSING) || |
| 1299 | (ch->ch_cflag & CF_CREAD) == 0) { |
| 1300 | ch->ch_rout = ch->ch_rin; |
| 1301 | } else if ((ch->ch_flag & CH_FAST_READ) == 0 || |
| 1302 | ch->ch_inwait != 0) { |
| 1303 | dgrp_input(ch); |
| 1304 | |
| 1305 | if (ch->ch_rin != ch->ch_rout) |
| 1306 | work = 1; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | /* |
| 1311 | * Handle receive flush, and changes to |
| 1312 | * server port parameters. |
| 1313 | */ |
| 1314 | |
| 1315 | if (ch->ch_flag & (CH_RX_FLUSH | CH_PARAM)) { |
| 1316 | /* |
| 1317 | * If we are in receive flush mode, |
| 1318 | * and enough data has gone by, reset |
| 1319 | * receive flush mode. |
| 1320 | */ |
| 1321 | if (ch->ch_flag & CH_RX_FLUSH) { |
| 1322 | if (((ch->ch_flush_seq - nd->nd_seq_out) & SEQ_MASK) > |
| 1323 | ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK)) |
| 1324 | ch->ch_flag &= ~CH_RX_FLUSH; |
| 1325 | else |
| 1326 | work = 1; |
| 1327 | } |
| 1328 | |
| 1329 | /* |
| 1330 | * Send TMAX, TTIME. |
| 1331 | */ |
| 1332 | |
| 1333 | if (ch->ch_s_tmax != ch->ch_tmax || |
| 1334 | ch->ch_s_ttime != ch->ch_ttime) { |
| 1335 | b = set_cmd_header(b, port, 48); |
| 1336 | |
| 1337 | ch->ch_s_tmax = ch->ch_tmax; |
| 1338 | ch->ch_s_ttime = ch->ch_ttime; |
| 1339 | |
| 1340 | put_unaligned_be16(ch->ch_s_tmax, |
| 1341 | b); |
| 1342 | b += 2; |
| 1343 | |
| 1344 | put_unaligned_be16(ch->ch_s_ttime, |
| 1345 | b); |
| 1346 | b += 2; |
| 1347 | } |
| 1348 | |
| 1349 | /* |
| 1350 | * Send RLOW, RHIGH. |
| 1351 | */ |
| 1352 | |
| 1353 | if (ch->ch_s_rlow != ch->ch_rlow || |
| 1354 | ch->ch_s_rhigh != ch->ch_rhigh) { |
| 1355 | b = set_cmd_header(b, port, 45); |
| 1356 | |
| 1357 | ch->ch_s_rlow = ch->ch_rlow; |
| 1358 | ch->ch_s_rhigh = ch->ch_rhigh; |
| 1359 | |
| 1360 | put_unaligned_be16(ch->ch_s_rlow, |
| 1361 | b); |
| 1362 | b += 2; |
| 1363 | |
| 1364 | put_unaligned_be16(ch->ch_s_rhigh, |
| 1365 | b); |
| 1366 | b += 2; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * Send BRATE, CFLAG, IFLAG, |
| 1371 | * OFLAG, XFLAG. |
| 1372 | */ |
| 1373 | |
| 1374 | if (ch->ch_s_brate != ch->ch_brate || |
| 1375 | ch->ch_s_cflag != ch->ch_cflag || |
| 1376 | ch->ch_s_iflag != ch->ch_iflag || |
| 1377 | ch->ch_s_oflag != ch->ch_oflag || |
| 1378 | ch->ch_s_xflag != ch->ch_xflag) { |
| 1379 | b = set_cmd_header(b, port, 40); |
| 1380 | |
| 1381 | ch->ch_s_brate = ch->ch_brate; |
| 1382 | ch->ch_s_cflag = ch->ch_cflag; |
| 1383 | ch->ch_s_iflag = ch->ch_iflag; |
| 1384 | ch->ch_s_oflag = ch->ch_oflag; |
| 1385 | ch->ch_s_xflag = ch->ch_xflag; |
| 1386 | |
| 1387 | put_unaligned_be16(ch->ch_s_brate, |
| 1388 | b); |
| 1389 | b += 2; |
| 1390 | |
| 1391 | put_unaligned_be16(ch->ch_s_cflag, |
| 1392 | b); |
| 1393 | b += 2; |
| 1394 | |
| 1395 | put_unaligned_be16(ch->ch_s_iflag, |
| 1396 | b); |
| 1397 | b += 2; |
| 1398 | |
| 1399 | put_unaligned_be16(ch->ch_s_oflag, |
| 1400 | b); |
| 1401 | b += 2; |
| 1402 | |
| 1403 | put_unaligned_be16(ch->ch_s_xflag, |
| 1404 | b); |
| 1405 | b += 2; |
| 1406 | } |
| 1407 | |
| 1408 | /* |
| 1409 | * Send MOUT, MFLOW, MCTRL. |
| 1410 | */ |
| 1411 | |
| 1412 | if (ch->ch_s_mout != ch->ch_mout || |
| 1413 | ch->ch_s_mflow != ch->ch_mflow || |
| 1414 | ch->ch_s_mctrl != ch->ch_mctrl) { |
| 1415 | b = set_cmd_header(b, port, 44); |
| 1416 | |
| 1417 | *b++ = ch->ch_s_mout = ch->ch_mout; |
| 1418 | *b++ = ch->ch_s_mflow = ch->ch_mflow; |
| 1419 | *b++ = ch->ch_s_mctrl = ch->ch_mctrl; |
| 1420 | } |
| 1421 | |
| 1422 | /* |
| 1423 | * Send Flow control characters. |
| 1424 | */ |
| 1425 | |
| 1426 | if (ch->ch_s_xon != ch->ch_xon || |
| 1427 | ch->ch_s_xoff != ch->ch_xoff || |
| 1428 | ch->ch_s_lnext != ch->ch_lnext || |
| 1429 | ch->ch_s_xxon != ch->ch_xxon || |
| 1430 | ch->ch_s_xxoff != ch->ch_xxoff) { |
| 1431 | b = set_cmd_header(b, port, 46); |
| 1432 | |
| 1433 | *b++ = ch->ch_s_xon = ch->ch_xon; |
| 1434 | *b++ = ch->ch_s_xoff = ch->ch_xoff; |
| 1435 | *b++ = ch->ch_s_lnext = ch->ch_lnext; |
| 1436 | *b++ = ch->ch_s_xxon = ch->ch_xxon; |
| 1437 | *b++ = ch->ch_s_xxoff = ch->ch_xxoff; |
| 1438 | } |
| 1439 | |
| 1440 | /* |
| 1441 | * Send RMAX, RTIME. |
| 1442 | */ |
| 1443 | |
| 1444 | if (ch->ch_s_rmax != ch->ch_rmax || |
| 1445 | ch->ch_s_rtime != ch->ch_rtime) { |
| 1446 | b = set_cmd_header(b, port, 47); |
| 1447 | |
| 1448 | ch->ch_s_rmax = ch->ch_rmax; |
| 1449 | ch->ch_s_rtime = ch->ch_rtime; |
| 1450 | |
| 1451 | put_unaligned_be16(ch->ch_s_rmax, |
| 1452 | b); |
| 1453 | b += 2; |
| 1454 | |
| 1455 | put_unaligned_be16(ch->ch_s_rtime, |
| 1456 | b); |
| 1457 | b += 2; |
| 1458 | } |
| 1459 | |
| 1460 | ch->ch_flag &= ~CH_PARAM; |
| 1461 | wake_up_interruptible(&ch->ch_flag_wait); |
| 1462 | } |
| 1463 | |
| 1464 | |
| 1465 | /* |
| 1466 | * Handle action commands. |
| 1467 | */ |
| 1468 | |
| 1469 | if (ch->ch_send != 0) { |
| 1470 | /* int send = ch->ch_send & ~ch->ch_expect; */ |
| 1471 | send = ch->ch_send & ~ch->ch_expect; |
| 1472 | |
| 1473 | /* Send character immediate */ |
| 1474 | if ((send & RR_TX_ICHAR) != 0) { |
| 1475 | b = set_cmd_header(b, port, 60); |
| 1476 | |
| 1477 | *b++ = ch->ch_xon; |
| 1478 | ch->ch_expect |= RR_TX_ICHAR; |
| 1479 | } |
| 1480 | |
| 1481 | /* BREAK request */ |
| 1482 | if ((send & RR_TX_BREAK) != 0) { |
| 1483 | if (ch->ch_break_time != 0) { |
| 1484 | b = set_cmd_header(b, port, 61); |
| 1485 | put_unaligned_be16(ch->ch_break_time, |
| 1486 | b); |
| 1487 | b += 2; |
| 1488 | |
| 1489 | ch->ch_expect |= RR_TX_BREAK; |
| 1490 | ch->ch_break_time = 0; |
| 1491 | } else { |
| 1492 | ch->ch_send &= ~RR_TX_BREAK; |
| 1493 | ch->ch_flag &= ~CH_TX_BREAK; |
| 1494 | wake_up_interruptible(&ch->ch_flag_wait); |
| 1495 | } |
| 1496 | } |
| 1497 | |
| 1498 | /* |
| 1499 | * Flush input/output buffers. |
| 1500 | */ |
| 1501 | |
| 1502 | if ((send & (RR_RX_FLUSH | RR_TX_FLUSH)) != 0) { |
| 1503 | b = set_cmd_header(b, port, 62); |
| 1504 | |
| 1505 | *b++ = ((send & RR_TX_FLUSH) == 0 ? 1 : |
| 1506 | (send & RR_RX_FLUSH) == 0 ? 2 : 3); |
| 1507 | |
| 1508 | if (send & RR_RX_FLUSH) { |
| 1509 | ch->ch_flush_seq = nd->nd_seq_in; |
| 1510 | ch->ch_flag |= CH_RX_FLUSH; |
| 1511 | work = 1; |
| 1512 | send_sync = 1; |
| 1513 | wanted_sync_port = port; |
| 1514 | } |
| 1515 | |
| 1516 | ch->ch_send &= ~(RR_RX_FLUSH | RR_TX_FLUSH); |
| 1517 | } |
| 1518 | |
| 1519 | /* Pause input/output */ |
| 1520 | if ((send & (RR_RX_STOP | RR_TX_STOP)) != 0) { |
| 1521 | b = set_cmd_header(b, port, 63); |
| 1522 | *b = 0; |
| 1523 | |
| 1524 | if ((send & RR_TX_STOP) != 0) |
| 1525 | *b |= EV_OPU; |
| 1526 | |
| 1527 | if ((send & RR_RX_STOP) != 0) |
| 1528 | *b |= EV_IPU; |
| 1529 | |
| 1530 | b++; |
| 1531 | |
| 1532 | ch->ch_send &= ~(RR_RX_STOP | RR_TX_STOP); |
| 1533 | } |
| 1534 | |
| 1535 | /* Start input/output */ |
| 1536 | if ((send & (RR_RX_START | RR_TX_START)) != 0) { |
| 1537 | b = set_cmd_header(b, port, 64); |
| 1538 | *b = 0; |
| 1539 | |
| 1540 | if ((send & RR_TX_START) != 0) |
| 1541 | *b |= EV_OPU | EV_OPS | EV_OPX; |
| 1542 | |
| 1543 | if ((send & RR_RX_START) != 0) |
| 1544 | *b |= EV_IPU | EV_IPS; |
| 1545 | |
| 1546 | b++; |
| 1547 | |
| 1548 | ch->ch_send &= ~(RR_RX_START | RR_TX_START); |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | |
| 1553 | /* |
| 1554 | * Send a window sequence to acknowledge received data. |
| 1555 | */ |
| 1556 | |
| 1557 | rwin = (ch->ch_s_rin + |
| 1558 | ((ch->ch_rout - ch->ch_rin - 1) & RBUF_MASK)); |
| 1559 | |
| 1560 | n = (rwin - ch->ch_s_rwin) & 0xffff; |
| 1561 | |
| 1562 | if (n >= RBUF_MAX / 4) { |
| 1563 | b[0] = 0xa0 + (port & 0xf); |
| 1564 | ch->ch_s_rwin = rwin; |
| 1565 | put_unaligned_be16(rwin, b + 1); |
| 1566 | b += 3; |
| 1567 | } |
| 1568 | |
| 1569 | /* |
| 1570 | * If the terminal is waiting on LOW |
| 1571 | * water or EMPTY, and the condition |
| 1572 | * is now satisfied, call the line |
| 1573 | * discipline to put more data in the |
| 1574 | * buffer. |
| 1575 | */ |
| 1576 | |
| 1577 | n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1578 | |
| 1579 | if ((ch->ch_tun.un_flag & (UN_EMPTY|UN_LOW)) != 0) { |
| 1580 | if ((ch->ch_tun.un_flag & UN_LOW) != 0 ? |
| 1581 | (n <= TBUF_LOW) : |
| 1582 | (n == 0 && ch->ch_s_tpos == ch->ch_s_tin)) { |
| 1583 | ch->ch_tun.un_flag &= ~(UN_EMPTY|UN_LOW); |
| 1584 | |
| 1585 | if (waitqueue_active(&((ch->ch_tun.un_tty)->write_wait))) |
| 1586 | wake_up_interruptible(&((ch->ch_tun.un_tty)->write_wait)); |
| 1587 | tty_wakeup(ch->ch_tun.un_tty); |
| 1588 | n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | /* |
| 1593 | * If the printer is waiting on LOW |
| 1594 | * water, TIME, EMPTY or PWAIT, and is |
| 1595 | * now ready to put more data in the |
| 1596 | * buffer, call the line discipline to |
| 1597 | * do the job. |
| 1598 | */ |
| 1599 | |
Alan Cox | 720a9be | 2012-10-11 17:21:03 +0100 | [diff] [blame] | 1600 | /* FIXME: jiffies - ch->ch_waketime can never |
| 1601 | be < 0. Someone needs to work out what is |
| 1602 | actually intended here */ |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1603 | if (ch->ch_pun.un_open_count && |
| 1604 | (ch->ch_pun.un_flag & |
| 1605 | (UN_EMPTY|UN_TIME|UN_LOW|UN_PWAIT)) != 0) { |
| 1606 | |
| 1607 | if ((ch->ch_pun.un_flag & UN_LOW) != 0 ? |
| 1608 | (n <= TBUF_LOW) : |
| 1609 | (ch->ch_pun.un_flag & UN_TIME) != 0 ? |
Chen Gang | 5aaf4c2 | 2013-06-08 11:57:39 +0800 | [diff] [blame] | 1610 | time_is_before_jiffies(ch->ch_waketime) : |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1611 | (n == 0 && ch->ch_s_tpos == ch->ch_s_tin) && |
| 1612 | ((ch->ch_pun.un_flag & UN_EMPTY) != 0 || |
| 1613 | ((ch->ch_tun.un_open_count && |
| 1614 | ch->ch_tun.un_tty->ops->chars_in_buffer) ? |
| 1615 | (ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) == 0 |
| 1616 | : 1 |
| 1617 | ) |
| 1618 | )) { |
| 1619 | ch->ch_pun.un_flag &= ~(UN_EMPTY | UN_TIME | UN_LOW | UN_PWAIT); |
| 1620 | |
| 1621 | if (waitqueue_active(&((ch->ch_pun.un_tty)->write_wait))) |
| 1622 | wake_up_interruptible(&((ch->ch_pun.un_tty)->write_wait)); |
| 1623 | tty_wakeup(ch->ch_pun.un_tty); |
| 1624 | n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1625 | |
| 1626 | } else if ((ch->ch_pun.un_flag & UN_TIME) != 0) { |
| 1627 | work = 1; |
| 1628 | } |
| 1629 | } |
| 1630 | |
| 1631 | |
| 1632 | /* |
| 1633 | * Determine the max number of bytes |
| 1634 | * this port can send, including |
| 1635 | * packet header overhead. |
| 1636 | */ |
| 1637 | |
| 1638 | t = ((ch->ch_s_tsize + ch->ch_s_tpos - ch->ch_s_tin) & 0xffff); |
| 1639 | |
| 1640 | if (n > t) |
| 1641 | n = t; |
| 1642 | |
| 1643 | if (n != 0) { |
| 1644 | n += (n <= 8 ? 1 : n <= 255 ? 2 : 3); |
| 1645 | |
| 1646 | tdata[tchan++] = n; |
| 1647 | ttotal += n; |
| 1648 | } |
| 1649 | break; |
| 1650 | |
| 1651 | /* |
| 1652 | * Close the port. |
| 1653 | */ |
| 1654 | |
| 1655 | send_close: |
| 1656 | case CS_SEND_CLOSE: |
| 1657 | b = set_cmd_header(b, port, 10); |
| 1658 | if (ch->ch_otype == OTYPE_IMMEDIATE) |
| 1659 | *b++ = 3; |
| 1660 | else |
| 1661 | *b++ = 4; |
| 1662 | |
| 1663 | ch->ch_state = CS_WAIT_CLOSE; |
| 1664 | break; |
| 1665 | |
| 1666 | /* |
| 1667 | * Wait for a previous server request. |
| 1668 | */ |
| 1669 | |
| 1670 | case CS_WAIT_OPEN: |
| 1671 | case CS_WAIT_CANCEL: |
| 1672 | case CS_WAIT_FAIL: |
| 1673 | case CS_WAIT_QUERY: |
| 1674 | case CS_WAIT_CLOSE: |
| 1675 | break; |
| 1676 | |
| 1677 | default: |
| 1678 | pr_info("%s - unexpected channel state (%i)\n", |
| 1679 | __func__, ch->ch_state); |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | /* |
| 1684 | * If a module select code is needed, drop one in. If space |
| 1685 | * was reserved for one, but none is needed, recover the space. |
| 1686 | */ |
| 1687 | |
| 1688 | if (mod != nd->nd_tx_module) { |
| 1689 | if (b != mbuf) { |
| 1690 | mbuf[-1] = 0xf0 | mod; |
| 1691 | nd->nd_tx_module = mod; |
| 1692 | } else { |
| 1693 | b--; |
| 1694 | } |
| 1695 | } |
| 1696 | } |
| 1697 | |
| 1698 | /* |
| 1699 | * Adjust "tmax" so that under worst case conditions we do |
| 1700 | * not overflow either the daemon buffer or the internal |
| 1701 | * buffer in the loop that follows. Leave a safe area |
| 1702 | * of 64 bytes so we start getting asserts before we start |
| 1703 | * losing data or clobbering memory. |
| 1704 | */ |
| 1705 | |
| 1706 | n = UIO_MAX - UIO_BASE; |
| 1707 | |
| 1708 | if (tmax > n) |
| 1709 | tmax = n; |
| 1710 | |
| 1711 | tmax -= 64; |
| 1712 | |
| 1713 | tsafe = tmax; |
| 1714 | |
| 1715 | /* |
| 1716 | * Allocate space for 5 Module Selects, 1 Sequence Request, |
| 1717 | * and 1 Set TREQ for each active channel. |
| 1718 | */ |
| 1719 | |
| 1720 | tmax -= 5 + 3 + 4 * nd->nd_chan_count; |
| 1721 | |
| 1722 | /* |
| 1723 | * Further reduce "tmax" to the available transmit credit. |
| 1724 | * Note that this is a soft constraint; The transmit credit |
| 1725 | * can go negative for a time and then recover. |
| 1726 | */ |
| 1727 | |
| 1728 | n = nd->nd_tx_deposit - nd->nd_tx_charge - nd->nd_link.lk_header_size; |
| 1729 | |
| 1730 | if (tmax > n) |
| 1731 | tmax = n; |
| 1732 | |
| 1733 | /* |
| 1734 | * Finally reduce tmax by the number of bytes already in |
| 1735 | * the buffer. |
| 1736 | */ |
| 1737 | |
| 1738 | tmax -= b - buf; |
| 1739 | |
| 1740 | /* |
| 1741 | * Suspend data transmit unless every ready channel can send |
| 1742 | * at least 1 character. |
| 1743 | */ |
| 1744 | if (tmax < 2 * nd->nd_chan_count) { |
| 1745 | tsend = 1; |
| 1746 | |
| 1747 | } else if (tchan > 1 && ttotal > tmax) { |
| 1748 | |
| 1749 | /* |
| 1750 | * If transmit is limited by the credit budget, find the |
| 1751 | * largest number of characters we can send without driving |
| 1752 | * the credit negative. |
| 1753 | */ |
| 1754 | |
| 1755 | long tm = tmax; |
| 1756 | int tc = tchan; |
| 1757 | int try; |
| 1758 | |
| 1759 | tsend = tm / tc; |
| 1760 | |
| 1761 | for (try = 0; try < 3; try++) { |
| 1762 | int i; |
| 1763 | int c = 0; |
| 1764 | |
| 1765 | for (i = 0; i < tc; i++) { |
| 1766 | if (tsend < tdata[i]) |
| 1767 | tdata[c++] = tdata[i]; |
| 1768 | else |
| 1769 | tm -= tdata[i]; |
| 1770 | } |
| 1771 | |
| 1772 | if (c == tc) |
| 1773 | break; |
| 1774 | |
| 1775 | tsend = tm / c; |
| 1776 | |
| 1777 | if (c == 1) |
| 1778 | break; |
| 1779 | |
| 1780 | tc = c; |
| 1781 | } |
| 1782 | |
| 1783 | tsend = tm / nd->nd_chan_count; |
| 1784 | |
| 1785 | if (tsend < 2) |
| 1786 | tsend = 1; |
| 1787 | |
| 1788 | } else { |
| 1789 | /* |
| 1790 | * If no budgetary constraints, or only one channel ready |
| 1791 | * to send, set the character limit to the remaining |
| 1792 | * buffer size. |
| 1793 | */ |
| 1794 | |
| 1795 | tsend = tmax; |
| 1796 | } |
| 1797 | |
| 1798 | tsend -= (tsend <= 9) ? 1 : (tsend <= 257) ? 2 : 3; |
| 1799 | |
| 1800 | /* |
| 1801 | * Loop over all channels, sending queued data. |
| 1802 | */ |
| 1803 | |
| 1804 | port = 0; |
| 1805 | ch = nd->nd_chan; |
| 1806 | used_buffer = tmax; |
| 1807 | |
| 1808 | for (mod = 0; port < nd->nd_chan_count; mod++) { |
| 1809 | /* |
| 1810 | * If this is not the current module, enter a module select |
| 1811 | * code in the buffer. |
| 1812 | */ |
| 1813 | |
| 1814 | if (mod != nd->nd_tx_module) |
| 1815 | mbuf = ++b; |
| 1816 | |
| 1817 | /* |
| 1818 | * Loop to process one module. |
| 1819 | */ |
| 1820 | |
| 1821 | maxport = port + 16; |
| 1822 | |
| 1823 | if (maxport > nd->nd_chan_count) |
| 1824 | maxport = nd->nd_chan_count; |
| 1825 | |
| 1826 | for (; port < maxport; port++, ch++) { |
| 1827 | if (ch->ch_state != CS_READY) |
| 1828 | continue; |
| 1829 | |
| 1830 | lastport = port; |
| 1831 | |
| 1832 | n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1833 | |
| 1834 | /* |
| 1835 | * If there is data that can be sent, send it. |
| 1836 | */ |
| 1837 | |
| 1838 | if (n != 0 && used_buffer > 0) { |
| 1839 | t = (ch->ch_s_tsize + ch->ch_s_tpos - ch->ch_s_tin) & 0xffff; |
| 1840 | |
| 1841 | if (n > t) |
| 1842 | n = t; |
| 1843 | |
| 1844 | if (n > tsend) { |
| 1845 | work = 1; |
| 1846 | n = tsend; |
| 1847 | } |
| 1848 | |
| 1849 | if (n > used_buffer) { |
| 1850 | work = 1; |
| 1851 | n = used_buffer; |
| 1852 | } |
| 1853 | |
| 1854 | if (n <= 0) |
| 1855 | continue; |
| 1856 | |
| 1857 | /* |
| 1858 | * Create the correct size transmit header, |
| 1859 | * depending on the amount of data to transmit. |
| 1860 | */ |
| 1861 | |
| 1862 | if (n <= 8) { |
| 1863 | |
| 1864 | b[0] = ((n - 1) << 4) + (port & 0xf); |
| 1865 | b += 1; |
| 1866 | |
| 1867 | } else if (n <= 255) { |
| 1868 | |
| 1869 | b[0] = 0x80 + (port & 0xf); |
| 1870 | b[1] = n; |
| 1871 | b += 2; |
| 1872 | |
| 1873 | } else { |
| 1874 | |
| 1875 | b[0] = 0x90 + (port & 0xf); |
| 1876 | put_unaligned_be16(n, b + 1); |
| 1877 | b += 3; |
| 1878 | } |
| 1879 | |
| 1880 | ch->ch_s_tin = (ch->ch_s_tin + n) & 0xffff; |
| 1881 | |
| 1882 | /* |
| 1883 | * Copy transmit data to the packet. |
| 1884 | */ |
| 1885 | |
| 1886 | t = TBUF_MAX - ch->ch_tout; |
| 1887 | |
| 1888 | if (n >= t) { |
| 1889 | memcpy(b, ch->ch_tbuf + ch->ch_tout, t); |
| 1890 | b += t; |
| 1891 | n -= t; |
| 1892 | used_buffer -= t; |
| 1893 | ch->ch_tout = 0; |
| 1894 | } |
| 1895 | |
| 1896 | memcpy(b, ch->ch_tbuf + ch->ch_tout, n); |
| 1897 | b += n; |
| 1898 | used_buffer -= n; |
| 1899 | ch->ch_tout += n; |
| 1900 | n = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1901 | } |
| 1902 | |
| 1903 | /* |
| 1904 | * Wake any terminal unit process waiting in the |
| 1905 | * dgrp_write routine for low water. |
| 1906 | */ |
| 1907 | |
| 1908 | if (n > TBUF_LOW) |
| 1909 | continue; |
| 1910 | |
| 1911 | if ((ch->ch_flag & CH_LOW) != 0) { |
| 1912 | ch->ch_flag &= ~CH_LOW; |
| 1913 | wake_up_interruptible(&ch->ch_flag_wait); |
| 1914 | } |
| 1915 | |
| 1916 | /* selwakeup tty_sel */ |
| 1917 | if (ch->ch_tun.un_open_count) { |
| 1918 | struct tty_struct *tty = (ch->ch_tun.un_tty); |
| 1919 | |
| 1920 | if (waitqueue_active(&tty->write_wait)) |
| 1921 | wake_up_interruptible(&tty->write_wait); |
| 1922 | |
| 1923 | tty_wakeup(tty); |
| 1924 | } |
| 1925 | |
| 1926 | if (ch->ch_pun.un_open_count) { |
| 1927 | struct tty_struct *tty = (ch->ch_pun.un_tty); |
| 1928 | |
| 1929 | if (waitqueue_active(&tty->write_wait)) |
| 1930 | wake_up_interruptible(&tty->write_wait); |
| 1931 | |
| 1932 | tty_wakeup(tty); |
| 1933 | } |
| 1934 | |
| 1935 | /* |
| 1936 | * Do EMPTY processing. |
| 1937 | */ |
| 1938 | |
| 1939 | if (n != 0) |
| 1940 | continue; |
| 1941 | |
| 1942 | if ((ch->ch_flag & (CH_EMPTY | CH_DRAIN)) != 0 || |
| 1943 | (ch->ch_pun.un_flag & UN_EMPTY) != 0) { |
| 1944 | /* |
| 1945 | * If there is still data in the server, ask the server |
| 1946 | * to notify us when its all gone. |
| 1947 | */ |
| 1948 | |
| 1949 | if (ch->ch_s_treq != ch->ch_s_tin) { |
| 1950 | b = set_cmd_header(b, port, 43); |
| 1951 | |
| 1952 | ch->ch_s_treq = ch->ch_s_tin; |
| 1953 | put_unaligned_be16(ch->ch_s_treq, |
| 1954 | b); |
| 1955 | b += 2; |
| 1956 | } |
| 1957 | |
| 1958 | /* |
| 1959 | * If there is a thread waiting for buffer empty, |
| 1960 | * and we are truly empty, wake the thread. |
| 1961 | */ |
| 1962 | |
| 1963 | else if ((ch->ch_flag & CH_EMPTY) != 0 && |
| 1964 | (ch->ch_send & RR_TX_BREAK) == 0) { |
| 1965 | ch->ch_flag &= ~CH_EMPTY; |
| 1966 | |
| 1967 | wake_up_interruptible(&ch->ch_flag_wait); |
| 1968 | } |
| 1969 | } |
| 1970 | } |
| 1971 | |
| 1972 | /* |
| 1973 | * If a module select code is needed, drop one in. If space |
| 1974 | * was reserved for one, but none is needed, recover the space. |
| 1975 | */ |
| 1976 | |
| 1977 | if (mod != nd->nd_tx_module) { |
| 1978 | if (b != mbuf) { |
| 1979 | mbuf[-1] = 0xf0 | mod; |
| 1980 | nd->nd_tx_module = mod; |
| 1981 | } else { |
| 1982 | b--; |
| 1983 | } |
| 1984 | } |
| 1985 | } |
| 1986 | |
| 1987 | /* |
| 1988 | * Send a synchronization sequence associated with the last open |
| 1989 | * channel that sent data, and remember the time when the data was |
| 1990 | * sent. |
| 1991 | */ |
| 1992 | |
| 1993 | in = nd->nd_seq_in; |
| 1994 | |
| 1995 | if ((send_sync || nd->nd_seq_wait[in] != 0) && lastport >= 0) { |
| 1996 | u8 *bb = b; |
| 1997 | |
| 1998 | /* |
| 1999 | * Attempt the use the port that really wanted the sync. |
| 2000 | * This gets around a race condition where the "lastport" is in |
| 2001 | * the middle of the close() routine, and by the time we |
| 2002 | * send this command, it will have already acked the close, and |
| 2003 | * thus not send the sync response. |
| 2004 | */ |
| 2005 | if (wanted_sync_port >= 0) |
| 2006 | lastport = wanted_sync_port; |
| 2007 | /* |
| 2008 | * Set a flag just in case the port is in the middle of a close, |
| 2009 | * it will not be permitted to actually close until we get an |
| 2010 | * sync response, and clear the flag there. |
| 2011 | */ |
| 2012 | ch = nd->nd_chan + lastport; |
| 2013 | ch->ch_flag |= CH_WAITING_SYNC; |
| 2014 | |
| 2015 | mod = lastport >> 4; |
| 2016 | |
| 2017 | if (mod != nd->nd_tx_module) { |
| 2018 | bb[0] = 0xf0 + mod; |
| 2019 | bb += 1; |
| 2020 | |
| 2021 | nd->nd_tx_module = mod; |
| 2022 | } |
| 2023 | |
| 2024 | bb = set_cmd_header(bb, lastport, 12); |
| 2025 | *bb++ = in; |
| 2026 | |
| 2027 | nd->nd_seq_size[in] = bb - buf; |
| 2028 | nd->nd_seq_time[in] = jiffies; |
| 2029 | |
| 2030 | if (++in >= SEQ_MAX) |
| 2031 | in = 0; |
| 2032 | |
| 2033 | if (in != nd->nd_seq_out) { |
| 2034 | b = bb; |
| 2035 | nd->nd_seq_in = in; |
| 2036 | nd->nd_unack += b - buf; |
| 2037 | } |
| 2038 | } |
| 2039 | |
| 2040 | /* |
| 2041 | * If there are no open ports, a sync cannot be sent. |
| 2042 | * There is nothing left to wait for anyway, so wake any |
| 2043 | * thread waiting for an acknowledgement. |
| 2044 | */ |
| 2045 | |
| 2046 | else if (nd->nd_seq_wait[in] != 0) { |
| 2047 | nd->nd_seq_wait[in] = 0; |
| 2048 | |
| 2049 | wake_up_interruptible(&nd->nd_seq_wque[in]); |
| 2050 | } |
| 2051 | |
| 2052 | /* |
| 2053 | * If there is no traffic for an interval of IDLE_MAX, then |
| 2054 | * send a single byte packet. |
| 2055 | */ |
| 2056 | |
| 2057 | if (b != buf) { |
| 2058 | nd->nd_tx_time = jiffies; |
| 2059 | } else if ((ulong)(jiffies - nd->nd_tx_time) >= IDLE_MAX) { |
| 2060 | *b++ = 0xf0 | nd->nd_tx_module; |
| 2061 | nd->nd_tx_time = jiffies; |
| 2062 | } |
| 2063 | |
| 2064 | n = b - buf; |
| 2065 | |
| 2066 | if (n >= tsafe) |
| 2067 | pr_info("%s - n(%i) >= tsafe(%i)\n", |
| 2068 | __func__, n, tsafe); |
| 2069 | |
| 2070 | if (tsend < 0) |
| 2071 | dgrp_dump(buf, n); |
| 2072 | |
| 2073 | nd->nd_tx_work = work; |
| 2074 | |
| 2075 | return n; |
| 2076 | } |
| 2077 | |
| 2078 | /* |
| 2079 | * dgrp_net_read() |
| 2080 | * Data to be sent TO the PortServer from the "async." half of the driver. |
| 2081 | */ |
| 2082 | static ssize_t dgrp_net_read(struct file *file, char __user *buf, size_t count, |
| 2083 | loff_t *ppos) |
| 2084 | { |
| 2085 | struct nd_struct *nd; |
| 2086 | long n; |
| 2087 | u8 *local_buf; |
| 2088 | u8 *b; |
| 2089 | ssize_t rtn; |
| 2090 | |
| 2091 | /* |
| 2092 | * Get the node pointer, and quit if it doesn't exist. |
| 2093 | */ |
| 2094 | nd = (struct nd_struct *)(file->private_data); |
| 2095 | if (!nd) |
| 2096 | return -ENXIO; |
| 2097 | |
| 2098 | if (count < UIO_MIN) |
| 2099 | return -EINVAL; |
| 2100 | |
| 2101 | /* |
| 2102 | * Only one read/write operation may be in progress at |
| 2103 | * any given time. |
| 2104 | */ |
| 2105 | |
| 2106 | /* |
| 2107 | * Grab the NET lock. |
| 2108 | */ |
| 2109 | down(&nd->nd_net_semaphore); |
| 2110 | |
| 2111 | nd->nd_read_count++; |
| 2112 | |
| 2113 | nd->nd_tx_ready = 0; |
| 2114 | |
| 2115 | /* |
| 2116 | * Determine the effective size of the buffer. |
| 2117 | */ |
| 2118 | |
| 2119 | if (nd->nd_remain > UIO_BASE) |
| 2120 | pr_info_ratelimited("%s - nd_remain(%i) > UIO_BASE\n", |
| 2121 | __func__, nd->nd_remain); |
| 2122 | |
| 2123 | b = local_buf = nd->nd_iobuf + UIO_BASE; |
| 2124 | |
| 2125 | /* |
| 2126 | * Generate data according to the node state. |
| 2127 | */ |
| 2128 | |
| 2129 | switch (nd->nd_state) { |
| 2130 | /* |
| 2131 | * Initialize the connection. |
| 2132 | */ |
| 2133 | |
| 2134 | case NS_IDLE: |
| 2135 | if (nd->nd_mon_buf) |
| 2136 | dgrp_monitor_reset(nd); |
| 2137 | |
| 2138 | /* |
| 2139 | * Request a Product ID Packet. |
| 2140 | */ |
| 2141 | |
| 2142 | b[0] = 0xfb; |
| 2143 | b[1] = 0x01; |
| 2144 | b += 2; |
| 2145 | |
| 2146 | nd->nd_expect |= NR_IDENT; |
| 2147 | |
| 2148 | /* |
| 2149 | * Request a Server Capability ID Response. |
| 2150 | */ |
| 2151 | |
| 2152 | b[0] = 0xfb; |
| 2153 | b[1] = 0x02; |
| 2154 | b += 2; |
| 2155 | |
| 2156 | nd->nd_expect |= NR_CAPABILITY; |
| 2157 | |
| 2158 | /* |
| 2159 | * Request a Server VPD Response. |
| 2160 | */ |
| 2161 | |
| 2162 | b[0] = 0xfb; |
| 2163 | b[1] = 0x18; |
| 2164 | b += 2; |
| 2165 | |
| 2166 | nd->nd_expect |= NR_VPD; |
| 2167 | |
| 2168 | nd->nd_state = NS_WAIT_QUERY; |
| 2169 | break; |
| 2170 | |
| 2171 | /* |
| 2172 | * We do serious communication with the server only in |
| 2173 | * the READY state. |
| 2174 | */ |
| 2175 | |
| 2176 | case NS_READY: |
| 2177 | b = dgrp_send(nd, count) + local_buf; |
| 2178 | break; |
| 2179 | |
| 2180 | /* |
| 2181 | * Send off an error after receiving a bogus message |
| 2182 | * from the server. |
| 2183 | */ |
| 2184 | |
| 2185 | case NS_SEND_ERROR: |
| 2186 | n = strlen(nd->nd_error); |
| 2187 | |
| 2188 | b[0] = 0xff; |
| 2189 | b[1] = n; |
| 2190 | memcpy(b + 2, nd->nd_error, n); |
| 2191 | b += 2 + n; |
| 2192 | |
| 2193 | dgrp_net_idle(nd); |
| 2194 | /* |
| 2195 | * Set the active port count to zero. |
| 2196 | */ |
| 2197 | dgrp_chan_count(nd, 0); |
| 2198 | break; |
| 2199 | |
| 2200 | default: |
| 2201 | break; |
| 2202 | } |
| 2203 | |
| 2204 | n = b - local_buf; |
| 2205 | |
| 2206 | if (n != 0) { |
| 2207 | nd->nd_send_count++; |
| 2208 | |
| 2209 | nd->nd_tx_byte += n + nd->nd_link.lk_header_size; |
| 2210 | nd->nd_tx_charge += n + nd->nd_link.lk_header_size; |
| 2211 | } |
| 2212 | |
| 2213 | rtn = copy_to_user((void __user *)buf, local_buf, n); |
| 2214 | if (rtn) { |
| 2215 | rtn = -EFAULT; |
| 2216 | goto done; |
| 2217 | } |
| 2218 | |
| 2219 | *ppos += n; |
| 2220 | |
| 2221 | rtn = n; |
| 2222 | |
| 2223 | if (nd->nd_mon_buf) |
| 2224 | dgrp_monitor_data(nd, RPDUMP_CLIENT, local_buf, n); |
| 2225 | |
| 2226 | /* |
| 2227 | * Release the NET lock. |
| 2228 | */ |
| 2229 | done: |
| 2230 | up(&nd->nd_net_semaphore); |
| 2231 | |
| 2232 | return rtn; |
| 2233 | } |
| 2234 | |
| 2235 | /** |
| 2236 | * dgrp_receive() -- decode data packets received from the remote PortServer. |
| 2237 | * @nd: pointer to a node structure |
| 2238 | */ |
| 2239 | static void dgrp_receive(struct nd_struct *nd) |
| 2240 | { |
| 2241 | struct ch_struct *ch; |
| 2242 | u8 *buf; |
| 2243 | u8 *b; |
| 2244 | u8 *dbuf; |
| 2245 | char *error; |
| 2246 | long port; |
| 2247 | long dlen; |
| 2248 | long plen; |
| 2249 | long remain; |
| 2250 | long n; |
| 2251 | long mlast; |
| 2252 | long elast; |
| 2253 | long mstat; |
| 2254 | long estat; |
| 2255 | |
| 2256 | char ID[3]; |
| 2257 | |
| 2258 | nd->nd_tx_time = jiffies; |
| 2259 | |
| 2260 | ID_TO_CHAR(nd->nd_ID, ID); |
| 2261 | |
| 2262 | b = buf = nd->nd_iobuf; |
| 2263 | remain = nd->nd_remain; |
| 2264 | |
| 2265 | /* |
| 2266 | * Loop to process Realport protocol packets. |
| 2267 | */ |
| 2268 | |
| 2269 | while (remain > 0) { |
| 2270 | int n0 = b[0] >> 4; |
| 2271 | int n1 = b[0] & 0x0f; |
| 2272 | |
| 2273 | if (n0 <= 12) { |
| 2274 | port = (nd->nd_rx_module << 4) + n1; |
| 2275 | |
| 2276 | if (port >= nd->nd_chan_count) { |
| 2277 | error = "Improper Port Number"; |
| 2278 | goto prot_error; |
| 2279 | } |
| 2280 | |
| 2281 | ch = nd->nd_chan + port; |
| 2282 | } else { |
| 2283 | port = -1; |
| 2284 | ch = NULL; |
| 2285 | } |
| 2286 | |
| 2287 | /* |
| 2288 | * Process by major packet type. |
| 2289 | */ |
| 2290 | |
| 2291 | switch (n0) { |
| 2292 | |
| 2293 | /* |
| 2294 | * Process 1-byte header data packet. |
| 2295 | */ |
| 2296 | |
| 2297 | case 0: |
| 2298 | case 1: |
| 2299 | case 2: |
| 2300 | case 3: |
| 2301 | case 4: |
| 2302 | case 5: |
| 2303 | case 6: |
| 2304 | case 7: |
| 2305 | dlen = n0 + 1; |
| 2306 | plen = dlen + 1; |
| 2307 | |
| 2308 | dbuf = b + 1; |
Greg Kroah-Hartman | ead00dd | 2014-02-07 09:16:38 -0800 | [diff] [blame] | 2309 | goto data; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 2310 | |
| 2311 | /* |
| 2312 | * Process 2-byte header data packet. |
| 2313 | */ |
| 2314 | |
| 2315 | case 8: |
| 2316 | if (remain < 3) |
| 2317 | goto done; |
| 2318 | |
| 2319 | dlen = b[1]; |
| 2320 | plen = dlen + 2; |
| 2321 | |
| 2322 | dbuf = b + 2; |
Greg Kroah-Hartman | ead00dd | 2014-02-07 09:16:38 -0800 | [diff] [blame] | 2323 | goto data; |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 2324 | |
| 2325 | /* |
| 2326 | * Process 3-byte header data packet. |
| 2327 | */ |
| 2328 | |
| 2329 | case 9: |
| 2330 | if (remain < 4) |
| 2331 | goto done; |
| 2332 | |
| 2333 | dlen = get_unaligned_be16(b + 1); |
| 2334 | plen = dlen + 3; |
| 2335 | |
| 2336 | dbuf = b + 3; |
| 2337 | |
Greg Kroah-Hartman | ead00dd | 2014-02-07 09:16:38 -0800 | [diff] [blame] | 2338 | /* |
| 2339 | * Common packet handling code. |
| 2340 | */ |
| 2341 | |
| 2342 | data: |
| 2343 | nd->nd_tx_work = 1; |
| 2344 | |
| 2345 | /* |
| 2346 | * Otherwise data should appear only when we are |
| 2347 | * in the CS_READY state. |
| 2348 | */ |
| 2349 | |
| 2350 | if (ch->ch_state < CS_READY) { |
| 2351 | error = "Data received before RWIN established"; |
| 2352 | goto prot_error; |
| 2353 | } |
| 2354 | |
| 2355 | /* |
| 2356 | * Assure that the data received is within the |
| 2357 | * allowable window. |
| 2358 | */ |
| 2359 | |
| 2360 | n = (ch->ch_s_rwin - ch->ch_s_rin) & 0xffff; |
| 2361 | |
| 2362 | if (dlen > n) { |
| 2363 | error = "Receive data overrun"; |
| 2364 | goto prot_error; |
| 2365 | } |
| 2366 | |
| 2367 | /* |
| 2368 | * If we received 3 or less characters, |
| 2369 | * assume it is a human typing, and set RTIME |
| 2370 | * to 10 milliseconds. |
| 2371 | * |
| 2372 | * If we receive 10 or more characters, |
| 2373 | * assume its not a human typing, and set RTIME |
| 2374 | * to 100 milliseconds. |
| 2375 | */ |
| 2376 | |
| 2377 | if (ch->ch_edelay != DGRP_RTIME) { |
| 2378 | if (ch->ch_rtime != ch->ch_edelay) { |
| 2379 | ch->ch_rtime = ch->ch_edelay; |
| 2380 | ch->ch_flag |= CH_PARAM; |
| 2381 | } |
| 2382 | } else if (dlen <= 3) { |
| 2383 | if (ch->ch_rtime != 10) { |
| 2384 | ch->ch_rtime = 10; |
| 2385 | ch->ch_flag |= CH_PARAM; |
| 2386 | } |
| 2387 | } else { |
| 2388 | if (ch->ch_rtime != DGRP_RTIME) { |
| 2389 | ch->ch_rtime = DGRP_RTIME; |
| 2390 | ch->ch_flag |= CH_PARAM; |
| 2391 | } |
| 2392 | } |
| 2393 | |
| 2394 | /* |
| 2395 | * If a portion of the packet is outside the |
| 2396 | * buffer, shorten the effective length of the |
| 2397 | * data packet to be the amount of data received. |
| 2398 | */ |
| 2399 | |
| 2400 | if (remain < plen) |
| 2401 | dlen -= plen - remain; |
| 2402 | |
| 2403 | /* |
| 2404 | * Detect if receive flush is now complete. |
| 2405 | */ |
| 2406 | |
| 2407 | if ((ch->ch_flag & CH_RX_FLUSH) != 0 && |
| 2408 | ((ch->ch_flush_seq - nd->nd_seq_out) & SEQ_MASK) >= |
| 2409 | ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK)) { |
| 2410 | ch->ch_flag &= ~CH_RX_FLUSH; |
| 2411 | } |
| 2412 | |
| 2413 | /* |
| 2414 | * If we are ready to receive, move the data into |
| 2415 | * the receive buffer. |
| 2416 | */ |
| 2417 | |
| 2418 | ch->ch_s_rin = (ch->ch_s_rin + dlen) & 0xffff; |
| 2419 | |
| 2420 | if (ch->ch_state == CS_READY && |
| 2421 | (ch->ch_tun.un_open_count != 0) && |
| 2422 | (ch->ch_tun.un_flag & UN_CLOSING) == 0 && |
| 2423 | (ch->ch_cflag & CF_CREAD) != 0 && |
| 2424 | (ch->ch_flag & (CH_BAUD0 | CH_RX_FLUSH)) == 0 && |
| 2425 | (ch->ch_send & RR_RX_FLUSH) == 0) { |
| 2426 | |
| 2427 | if (ch->ch_rin + dlen >= RBUF_MAX) { |
| 2428 | n = RBUF_MAX - ch->ch_rin; |
| 2429 | |
| 2430 | memcpy(ch->ch_rbuf + ch->ch_rin, dbuf, n); |
| 2431 | |
| 2432 | ch->ch_rin = 0; |
| 2433 | dbuf += n; |
| 2434 | dlen -= n; |
| 2435 | } |
| 2436 | |
| 2437 | memcpy(ch->ch_rbuf + ch->ch_rin, dbuf, dlen); |
| 2438 | |
| 2439 | ch->ch_rin += dlen; |
| 2440 | |
| 2441 | |
| 2442 | /* |
| 2443 | * If we are not in fastcook mode, or |
| 2444 | * if there is a fastcook thread |
| 2445 | * waiting for data, send the data to |
| 2446 | * the line discipline. |
| 2447 | */ |
| 2448 | |
| 2449 | if ((ch->ch_flag & CH_FAST_READ) == 0 || |
| 2450 | ch->ch_inwait != 0) { |
| 2451 | dgrp_input(ch); |
| 2452 | } |
| 2453 | |
| 2454 | /* |
| 2455 | * If there is a read thread waiting |
| 2456 | * in select, and we are in fastcook |
| 2457 | * mode, wake him up. |
| 2458 | */ |
| 2459 | |
| 2460 | if (waitqueue_active(&ch->ch_tun.un_tty->read_wait) && |
| 2461 | (ch->ch_flag & CH_FAST_READ) != 0) |
| 2462 | wake_up_interruptible(&ch->ch_tun.un_tty->read_wait); |
| 2463 | |
| 2464 | /* |
| 2465 | * Wake any thread waiting in the |
| 2466 | * fastcook loop. |
| 2467 | */ |
| 2468 | |
| 2469 | if ((ch->ch_flag & CH_INPUT) != 0) { |
| 2470 | ch->ch_flag &= ~CH_INPUT; |
| 2471 | |
| 2472 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2473 | } |
| 2474 | } |
| 2475 | |
| 2476 | /* |
| 2477 | * Fabricate and insert a data packet header to |
| 2478 | * preced the remaining data when it comes in. |
| 2479 | */ |
| 2480 | |
| 2481 | if (remain < plen) { |
| 2482 | dlen = plen - remain; |
| 2483 | b = buf; |
| 2484 | |
| 2485 | b[0] = 0x90 + n1; |
| 2486 | put_unaligned_be16(dlen, b + 1); |
| 2487 | |
| 2488 | remain = 3; |
| 2489 | goto done; |
| 2490 | } |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 2491 | break; |
| 2492 | |
| 2493 | /* |
| 2494 | * Handle Window Sequence packets. |
| 2495 | */ |
| 2496 | |
| 2497 | case 10: |
| 2498 | plen = 3; |
| 2499 | if (remain < plen) |
| 2500 | goto done; |
| 2501 | |
| 2502 | nd->nd_tx_work = 1; |
| 2503 | |
| 2504 | { |
| 2505 | ushort tpos = get_unaligned_be16(b + 1); |
| 2506 | |
| 2507 | ushort ack = (tpos - ch->ch_s_tpos) & 0xffff; |
| 2508 | ushort unack = (ch->ch_s_tin - ch->ch_s_tpos) & 0xffff; |
| 2509 | ushort notify = (ch->ch_s_treq - ch->ch_s_tpos) & 0xffff; |
| 2510 | |
| 2511 | if (ch->ch_state < CS_READY || ack > unack) { |
| 2512 | error = "Improper Window Sequence"; |
| 2513 | goto prot_error; |
| 2514 | } |
| 2515 | |
| 2516 | ch->ch_s_tpos = tpos; |
| 2517 | |
| 2518 | if (notify <= ack) |
| 2519 | ch->ch_s_treq = tpos; |
| 2520 | } |
| 2521 | break; |
| 2522 | |
| 2523 | /* |
| 2524 | * Handle Command response packets. |
| 2525 | */ |
| 2526 | |
| 2527 | case 11: |
| 2528 | |
| 2529 | /* |
| 2530 | * RealPort engine fix - 03/11/2004 |
| 2531 | * |
| 2532 | * This check did not used to be here. |
| 2533 | * |
| 2534 | * We were using b[1] without verifying that the data |
| 2535 | * is actually there and valid. On a split packet, it |
| 2536 | * might not be yet. |
| 2537 | * |
| 2538 | * NOTE: I have never actually seen the failure happen |
| 2539 | * under Linux, but since I have seen it occur |
| 2540 | * under both Solaris and HP-UX, the assumption |
| 2541 | * is that it *could* happen here as well... |
| 2542 | */ |
| 2543 | if (remain < 2) |
| 2544 | goto done; |
| 2545 | |
| 2546 | |
| 2547 | switch (b[1]) { |
| 2548 | |
| 2549 | /* |
| 2550 | * Handle Open Response. |
| 2551 | */ |
| 2552 | |
| 2553 | case 11: |
| 2554 | plen = 6; |
| 2555 | if (remain < plen) |
| 2556 | goto done; |
| 2557 | |
| 2558 | nd->nd_tx_work = 1; |
| 2559 | |
| 2560 | { |
| 2561 | int req = b[2]; |
| 2562 | int resp = b[3]; |
| 2563 | port = get_unaligned_be16(b + 4); |
| 2564 | |
| 2565 | if (port >= nd->nd_chan_count) { |
| 2566 | error = "Open channel number out of range"; |
| 2567 | goto prot_error; |
| 2568 | } |
| 2569 | |
| 2570 | ch = nd->nd_chan + port; |
| 2571 | |
| 2572 | /* |
| 2573 | * How we handle an open response depends primarily |
| 2574 | * on our current channel state. |
| 2575 | */ |
| 2576 | |
| 2577 | switch (ch->ch_state) { |
| 2578 | case CS_IDLE: |
| 2579 | |
| 2580 | /* |
| 2581 | * Handle a delayed open. |
| 2582 | */ |
| 2583 | |
| 2584 | if (ch->ch_otype_waiting != 0 && |
| 2585 | req == ch->ch_otype_waiting && |
| 2586 | resp == 0) { |
| 2587 | ch->ch_otype = req; |
| 2588 | ch->ch_otype_waiting = 0; |
| 2589 | ch->ch_state = CS_SEND_QUERY; |
| 2590 | break; |
| 2591 | } |
| 2592 | goto open_error; |
| 2593 | |
| 2594 | case CS_WAIT_OPEN: |
| 2595 | |
| 2596 | /* |
| 2597 | * Handle the open response. |
| 2598 | */ |
| 2599 | |
| 2600 | if (req == ch->ch_otype) { |
| 2601 | switch (resp) { |
| 2602 | |
| 2603 | /* |
| 2604 | * On successful response, open the |
| 2605 | * port and proceed normally. |
| 2606 | */ |
| 2607 | |
| 2608 | case 0: |
| 2609 | ch->ch_state = CS_SEND_QUERY; |
| 2610 | break; |
| 2611 | |
| 2612 | /* |
| 2613 | * On a busy response to a persistent open, |
| 2614 | * remember that the open is pending. |
| 2615 | */ |
| 2616 | |
| 2617 | case 1: |
| 2618 | case 2: |
| 2619 | if (req != OTYPE_IMMEDIATE) { |
| 2620 | ch->ch_otype_waiting = req; |
| 2621 | ch->ch_state = CS_IDLE; |
| 2622 | break; |
| 2623 | } |
| 2624 | |
| 2625 | /* |
| 2626 | * Otherwise the server open failed. If |
| 2627 | * the Unix port is open, hang it up. |
| 2628 | */ |
| 2629 | |
| 2630 | default: |
| 2631 | if (ch->ch_open_count != 0) { |
| 2632 | ch->ch_flag |= CH_HANGUP; |
| 2633 | dgrp_carrier(ch); |
| 2634 | ch->ch_state = CS_IDLE; |
| 2635 | break; |
| 2636 | } |
| 2637 | |
| 2638 | ch->ch_open_error = resp; |
| 2639 | ch->ch_state = CS_IDLE; |
| 2640 | |
| 2641 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2642 | } |
| 2643 | break; |
| 2644 | } |
| 2645 | |
| 2646 | /* |
Masanari Iida | a547e5e | 2012-11-17 16:43:25 +0900 | [diff] [blame] | 2647 | * Handle delayed response arrival preceding |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 2648 | * the open response we are waiting for. |
| 2649 | */ |
| 2650 | |
| 2651 | if (ch->ch_otype_waiting != 0 && |
| 2652 | req == ch->ch_otype_waiting && |
| 2653 | resp == 0) { |
| 2654 | ch->ch_otype = ch->ch_otype_waiting; |
| 2655 | ch->ch_otype_waiting = 0; |
| 2656 | ch->ch_state = CS_WAIT_FAIL; |
| 2657 | break; |
| 2658 | } |
| 2659 | goto open_error; |
| 2660 | |
| 2661 | |
| 2662 | case CS_WAIT_FAIL: |
| 2663 | |
| 2664 | /* |
| 2665 | * Handle response to immediate open arriving |
| 2666 | * after a delayed open success. |
| 2667 | */ |
| 2668 | |
| 2669 | if (req == OTYPE_IMMEDIATE) { |
| 2670 | ch->ch_state = CS_SEND_QUERY; |
| 2671 | break; |
| 2672 | } |
| 2673 | goto open_error; |
| 2674 | |
| 2675 | |
| 2676 | case CS_WAIT_CANCEL: |
| 2677 | /* |
| 2678 | * Handle delayed open response arriving before |
| 2679 | * the cancel response. |
| 2680 | */ |
| 2681 | |
| 2682 | if (req == ch->ch_otype_waiting && |
| 2683 | resp == 0) { |
| 2684 | ch->ch_otype_waiting = 0; |
| 2685 | break; |
| 2686 | } |
| 2687 | |
| 2688 | /* |
| 2689 | * Handle cancel response. |
| 2690 | */ |
| 2691 | |
| 2692 | if (req == 4 && resp == 0) { |
| 2693 | ch->ch_otype_waiting = 0; |
| 2694 | ch->ch_state = CS_IDLE; |
| 2695 | break; |
| 2696 | } |
| 2697 | goto open_error; |
| 2698 | |
| 2699 | |
| 2700 | case CS_WAIT_CLOSE: |
| 2701 | /* |
| 2702 | * Handle a successful response to a port |
| 2703 | * close. |
| 2704 | */ |
| 2705 | |
| 2706 | if (req >= 3) { |
| 2707 | ch->ch_state = CS_IDLE; |
| 2708 | break; |
| 2709 | } |
| 2710 | goto open_error; |
| 2711 | |
| 2712 | open_error: |
| 2713 | default: |
| 2714 | { |
| 2715 | error = "Improper Open Response"; |
| 2716 | goto prot_error; |
| 2717 | } |
| 2718 | } |
| 2719 | } |
| 2720 | break; |
| 2721 | |
| 2722 | /* |
| 2723 | * Handle Synchronize Response. |
| 2724 | */ |
| 2725 | |
| 2726 | case 13: |
| 2727 | plen = 3; |
| 2728 | if (remain < plen) |
| 2729 | goto done; |
| 2730 | { |
| 2731 | int seq = b[2]; |
| 2732 | int s; |
| 2733 | |
| 2734 | /* |
| 2735 | * If channel was waiting for this sync response, |
| 2736 | * unset the flag, and wake up anyone waiting |
| 2737 | * on the event. |
| 2738 | */ |
| 2739 | if (ch->ch_flag & CH_WAITING_SYNC) { |
| 2740 | ch->ch_flag &= ~(CH_WAITING_SYNC); |
| 2741 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2742 | } |
| 2743 | |
| 2744 | if (((seq - nd->nd_seq_out) & SEQ_MASK) >= |
| 2745 | ((nd->nd_seq_in - nd->nd_seq_out) & SEQ_MASK)) { |
| 2746 | break; |
| 2747 | } |
| 2748 | |
| 2749 | for (s = nd->nd_seq_out;; s = (s + 1) & SEQ_MASK) { |
| 2750 | if (nd->nd_seq_wait[s] != 0) { |
| 2751 | nd->nd_seq_wait[s] = 0; |
| 2752 | |
| 2753 | wake_up_interruptible(&nd->nd_seq_wque[s]); |
| 2754 | } |
| 2755 | |
| 2756 | nd->nd_unack -= nd->nd_seq_size[s]; |
| 2757 | |
| 2758 | if (s == seq) |
| 2759 | break; |
| 2760 | } |
| 2761 | |
| 2762 | nd->nd_seq_out = (seq + 1) & SEQ_MASK; |
| 2763 | } |
| 2764 | break; |
| 2765 | |
| 2766 | /* |
| 2767 | * Handle Sequence Response. |
| 2768 | */ |
| 2769 | |
| 2770 | case 15: |
| 2771 | plen = 6; |
| 2772 | if (remain < plen) |
| 2773 | goto done; |
| 2774 | |
| 2775 | { |
| 2776 | /* Record that we have received the Sequence |
| 2777 | * Response, but we aren't interested in the |
| 2778 | * sequence numbers. We were using RIN like it |
| 2779 | * was ROUT and that was causing problems, |
| 2780 | * fixed 7-13-2001 David Fries. See comment in |
| 2781 | * drp.h for ch_s_rin variable. |
| 2782 | int rin = get_unaligned_be16(b + 2); |
| 2783 | int tpos = get_unaligned_be16(b + 4); |
| 2784 | */ |
| 2785 | |
| 2786 | ch->ch_send &= ~RR_SEQUENCE; |
| 2787 | ch->ch_expect &= ~RR_SEQUENCE; |
| 2788 | } |
| 2789 | goto check_query; |
| 2790 | |
| 2791 | /* |
| 2792 | * Handle Status Response. |
| 2793 | */ |
| 2794 | |
| 2795 | case 17: |
| 2796 | plen = 5; |
| 2797 | if (remain < plen) |
| 2798 | goto done; |
| 2799 | |
| 2800 | { |
| 2801 | ch->ch_s_elast = get_unaligned_be16(b + 2); |
| 2802 | ch->ch_s_mlast = b[4]; |
| 2803 | |
| 2804 | ch->ch_expect &= ~RR_STATUS; |
| 2805 | ch->ch_send &= ~RR_STATUS; |
| 2806 | |
| 2807 | /* |
| 2808 | * CH_PHYS_CD is cleared because something _could_ be |
| 2809 | * waiting for the initial sense of carrier... and if |
| 2810 | * carrier is high immediately, we want to be sure to |
| 2811 | * wake them as soon as possible. |
| 2812 | */ |
| 2813 | ch->ch_flag &= ~CH_PHYS_CD; |
| 2814 | |
| 2815 | dgrp_carrier(ch); |
| 2816 | } |
| 2817 | goto check_query; |
| 2818 | |
| 2819 | /* |
| 2820 | * Handle Line Error Response. |
| 2821 | */ |
| 2822 | |
| 2823 | case 19: |
| 2824 | plen = 14; |
| 2825 | if (remain < plen) |
| 2826 | goto done; |
| 2827 | |
| 2828 | break; |
| 2829 | |
| 2830 | /* |
| 2831 | * Handle Buffer Response. |
| 2832 | */ |
| 2833 | |
| 2834 | case 21: |
| 2835 | plen = 6; |
| 2836 | if (remain < plen) |
| 2837 | goto done; |
| 2838 | |
| 2839 | { |
| 2840 | ch->ch_s_rsize = get_unaligned_be16(b + 2); |
| 2841 | ch->ch_s_tsize = get_unaligned_be16(b + 4); |
| 2842 | |
| 2843 | ch->ch_send &= ~RR_BUFFER; |
| 2844 | ch->ch_expect &= ~RR_BUFFER; |
| 2845 | } |
| 2846 | goto check_query; |
| 2847 | |
| 2848 | /* |
| 2849 | * Handle Port Capability Response. |
| 2850 | */ |
| 2851 | |
| 2852 | case 23: |
| 2853 | plen = 32; |
| 2854 | if (remain < plen) |
| 2855 | goto done; |
| 2856 | |
| 2857 | { |
| 2858 | ch->ch_send &= ~RR_CAPABILITY; |
| 2859 | ch->ch_expect &= ~RR_CAPABILITY; |
| 2860 | } |
| 2861 | |
| 2862 | /* |
| 2863 | * When all queries are complete, set those parameters |
| 2864 | * derived from the query results, then transition |
| 2865 | * to the READY state. |
| 2866 | */ |
| 2867 | |
| 2868 | check_query: |
| 2869 | if (ch->ch_state == CS_WAIT_QUERY && |
| 2870 | (ch->ch_expect & (RR_SEQUENCE | |
| 2871 | RR_STATUS | |
| 2872 | RR_BUFFER | |
| 2873 | RR_CAPABILITY)) == 0) { |
| 2874 | ch->ch_tmax = ch->ch_s_tsize / 4; |
| 2875 | |
| 2876 | if (ch->ch_edelay == DGRP_TTIME) |
| 2877 | ch->ch_ttime = DGRP_TTIME; |
| 2878 | else |
| 2879 | ch->ch_ttime = ch->ch_edelay; |
| 2880 | |
| 2881 | ch->ch_rmax = ch->ch_s_rsize / 4; |
| 2882 | |
| 2883 | if (ch->ch_edelay == DGRP_RTIME) |
| 2884 | ch->ch_rtime = DGRP_RTIME; |
| 2885 | else |
| 2886 | ch->ch_rtime = ch->ch_edelay; |
| 2887 | |
| 2888 | ch->ch_rlow = 2 * ch->ch_s_rsize / 8; |
| 2889 | ch->ch_rhigh = 6 * ch->ch_s_rsize / 8; |
| 2890 | |
| 2891 | ch->ch_state = CS_READY; |
| 2892 | |
| 2893 | nd->nd_tx_work = 1; |
| 2894 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2895 | |
| 2896 | } |
| 2897 | break; |
| 2898 | |
| 2899 | default: |
| 2900 | goto decode_error; |
| 2901 | } |
| 2902 | break; |
| 2903 | |
| 2904 | /* |
| 2905 | * Handle Events. |
| 2906 | */ |
| 2907 | |
| 2908 | case 12: |
| 2909 | plen = 4; |
| 2910 | if (remain < plen) |
| 2911 | goto done; |
| 2912 | |
| 2913 | mlast = ch->ch_s_mlast; |
| 2914 | elast = ch->ch_s_elast; |
| 2915 | |
| 2916 | mstat = ch->ch_s_mlast = b[1]; |
| 2917 | estat = ch->ch_s_elast = get_unaligned_be16(b + 2); |
| 2918 | |
| 2919 | /* |
| 2920 | * Handle modem changes. |
| 2921 | */ |
| 2922 | |
| 2923 | if (((mstat ^ mlast) & DM_CD) != 0) |
| 2924 | dgrp_carrier(ch); |
| 2925 | |
| 2926 | |
| 2927 | /* |
| 2928 | * Handle received break. |
| 2929 | */ |
| 2930 | |
| 2931 | if ((estat & ~elast & EV_RXB) != 0 && |
| 2932 | (ch->ch_tun.un_open_count != 0) && |
| 2933 | I_BRKINT(ch->ch_tun.un_tty) && |
| 2934 | !(I_IGNBRK(ch->ch_tun.un_tty))) { |
| 2935 | |
Jiri Slaby | 227434f | 2013-01-03 15:53:01 +0100 | [diff] [blame] | 2936 | tty_buffer_request_room(&ch->port, 1); |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 2937 | tty_insert_flip_char(&ch->port, 0, TTY_BREAK); |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 2938 | tty_flip_buffer_push(&ch->port); |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 2939 | |
| 2940 | } |
| 2941 | |
| 2942 | /* |
| 2943 | * On transmit break complete, if more break traffic |
| 2944 | * is waiting then send it. Otherwise wake any threads |
| 2945 | * waiting for transmitter empty. |
| 2946 | */ |
| 2947 | |
| 2948 | if ((~estat & elast & EV_TXB) != 0 && |
| 2949 | (ch->ch_expect & RR_TX_BREAK) != 0) { |
| 2950 | |
| 2951 | nd->nd_tx_work = 1; |
| 2952 | |
| 2953 | ch->ch_expect &= ~RR_TX_BREAK; |
| 2954 | |
| 2955 | if (ch->ch_break_time != 0) { |
| 2956 | ch->ch_send |= RR_TX_BREAK; |
| 2957 | } else { |
| 2958 | ch->ch_send &= ~RR_TX_BREAK; |
| 2959 | ch->ch_flag &= ~CH_TX_BREAK; |
| 2960 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2961 | } |
| 2962 | } |
| 2963 | break; |
| 2964 | |
| 2965 | case 13: |
| 2966 | case 14: |
| 2967 | error = "Unrecognized command"; |
| 2968 | goto prot_error; |
| 2969 | |
| 2970 | /* |
| 2971 | * Decode Special Codes. |
| 2972 | */ |
| 2973 | |
| 2974 | case 15: |
| 2975 | switch (n1) { |
| 2976 | /* |
| 2977 | * One byte module select. |
| 2978 | */ |
| 2979 | |
| 2980 | case 0: |
| 2981 | case 1: |
| 2982 | case 2: |
| 2983 | case 3: |
| 2984 | case 4: |
| 2985 | case 5: |
| 2986 | case 6: |
| 2987 | case 7: |
| 2988 | plen = 1; |
| 2989 | nd->nd_rx_module = n1; |
| 2990 | break; |
| 2991 | |
| 2992 | /* |
| 2993 | * Two byte module select. |
| 2994 | */ |
| 2995 | |
| 2996 | case 8: |
| 2997 | plen = 2; |
| 2998 | if (remain < plen) |
| 2999 | goto done; |
| 3000 | |
| 3001 | nd->nd_rx_module = b[1]; |
| 3002 | break; |
| 3003 | |
| 3004 | /* |
| 3005 | * ID Request packet. |
| 3006 | */ |
| 3007 | |
| 3008 | case 11: |
| 3009 | if (remain < 4) |
| 3010 | goto done; |
| 3011 | |
| 3012 | plen = get_unaligned_be16(b + 2); |
| 3013 | |
| 3014 | if (plen < 12 || plen > 1000) { |
| 3015 | error = "Response Packet length error"; |
| 3016 | goto prot_error; |
| 3017 | } |
| 3018 | |
| 3019 | nd->nd_tx_work = 1; |
| 3020 | |
| 3021 | switch (b[1]) { |
| 3022 | /* |
| 3023 | * Echo packet. |
| 3024 | */ |
| 3025 | |
| 3026 | case 0: |
| 3027 | nd->nd_send |= NR_ECHO; |
| 3028 | break; |
| 3029 | |
| 3030 | /* |
| 3031 | * ID Response packet. |
| 3032 | */ |
| 3033 | |
| 3034 | case 1: |
| 3035 | nd->nd_send |= NR_IDENT; |
| 3036 | break; |
| 3037 | |
| 3038 | /* |
| 3039 | * ID Response packet. |
| 3040 | */ |
| 3041 | |
| 3042 | case 32: |
| 3043 | nd->nd_send |= NR_PASSWORD; |
| 3044 | break; |
| 3045 | |
| 3046 | } |
| 3047 | break; |
| 3048 | |
| 3049 | /* |
| 3050 | * Various node-level response packets. |
| 3051 | */ |
| 3052 | |
| 3053 | case 12: |
| 3054 | if (remain < 4) |
| 3055 | goto done; |
| 3056 | |
| 3057 | plen = get_unaligned_be16(b + 2); |
| 3058 | |
| 3059 | if (plen < 4 || plen > 1000) { |
| 3060 | error = "Response Packet length error"; |
| 3061 | goto prot_error; |
| 3062 | } |
| 3063 | |
| 3064 | nd->nd_tx_work = 1; |
| 3065 | |
| 3066 | switch (b[1]) { |
| 3067 | /* |
| 3068 | * Echo packet. |
| 3069 | */ |
| 3070 | |
| 3071 | case 0: |
| 3072 | nd->nd_expect &= ~NR_ECHO; |
| 3073 | break; |
| 3074 | |
| 3075 | /* |
| 3076 | * Product Response Packet. |
| 3077 | */ |
| 3078 | |
| 3079 | case 1: |
| 3080 | { |
| 3081 | int desclen; |
| 3082 | |
| 3083 | nd->nd_hw_ver = (b[8] << 8) | b[9]; |
| 3084 | nd->nd_sw_ver = (b[10] << 8) | b[11]; |
| 3085 | nd->nd_hw_id = b[6]; |
Chen Gang | 0f6e8aa | 2013-05-02 17:05:28 +0800 | [diff] [blame] | 3086 | desclen = (plen - 12 > MAX_DESC_LEN - 1) ? MAX_DESC_LEN - 1 : |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 3087 | plen - 12; |
Bill Pemberton | ad0c6e3 | 2012-09-24 17:02:08 -0400 | [diff] [blame] | 3088 | |
| 3089 | if (desclen <= 0) { |
| 3090 | error = "Response Packet desclen error"; |
| 3091 | goto prot_error; |
| 3092 | } |
| 3093 | |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 3094 | strncpy(nd->nd_ps_desc, b + 12, desclen); |
| 3095 | nd->nd_ps_desc[desclen] = 0; |
| 3096 | } |
| 3097 | |
| 3098 | nd->nd_expect &= ~NR_IDENT; |
| 3099 | break; |
| 3100 | |
| 3101 | /* |
| 3102 | * Capability Response Packet. |
| 3103 | */ |
| 3104 | |
| 3105 | case 2: |
| 3106 | { |
| 3107 | int nn = get_unaligned_be16(b + 4); |
| 3108 | |
| 3109 | if (nn > CHAN_MAX) |
| 3110 | nn = CHAN_MAX; |
| 3111 | |
| 3112 | dgrp_chan_count(nd, nn); |
| 3113 | } |
| 3114 | |
| 3115 | nd->nd_expect &= ~NR_CAPABILITY; |
| 3116 | break; |
| 3117 | |
| 3118 | /* |
| 3119 | * VPD Response Packet. |
| 3120 | */ |
| 3121 | |
| 3122 | case 15: |
| 3123 | /* |
| 3124 | * NOTE: case 15 is here ONLY because the EtherLite |
| 3125 | * is broken, and sends a response to 24 back as 15. |
| 3126 | * To resolve this, the EtherLite firmware is now |
| 3127 | * fixed to send back 24 correctly, but, for backwards |
| 3128 | * compatibility, we now have reserved 15 for the |
| 3129 | * bad EtherLite response to 24 as well. |
| 3130 | */ |
| 3131 | |
| 3132 | /* Fallthru! */ |
| 3133 | |
| 3134 | case 24: |
| 3135 | |
| 3136 | /* |
| 3137 | * If the product doesn't support VPD, |
| 3138 | * it will send back a null IDRESP, |
| 3139 | * which is a length of 4 bytes. |
| 3140 | */ |
| 3141 | if (plen > 4) { |
| 3142 | memcpy(nd->nd_vpd, b + 4, min(plen - 4, (long) VPDSIZE)); |
| 3143 | nd->nd_vpd_len = min(plen - 4, (long) VPDSIZE); |
| 3144 | } |
| 3145 | |
| 3146 | nd->nd_expect &= ~NR_VPD; |
| 3147 | break; |
| 3148 | |
| 3149 | default: |
| 3150 | goto decode_error; |
| 3151 | } |
| 3152 | |
| 3153 | if (nd->nd_expect == 0 && |
| 3154 | nd->nd_state == NS_WAIT_QUERY) { |
| 3155 | nd->nd_state = NS_READY; |
| 3156 | } |
| 3157 | break; |
| 3158 | |
| 3159 | /* |
| 3160 | * Debug packet. |
| 3161 | */ |
| 3162 | |
| 3163 | case 14: |
| 3164 | if (remain < 4) |
| 3165 | goto done; |
| 3166 | |
| 3167 | plen = get_unaligned_be16(b + 2) + 4; |
| 3168 | |
| 3169 | if (plen > 1000) { |
| 3170 | error = "Debug Packet too large"; |
| 3171 | goto prot_error; |
| 3172 | } |
| 3173 | |
| 3174 | if (remain < plen) |
| 3175 | goto done; |
| 3176 | break; |
| 3177 | |
| 3178 | /* |
| 3179 | * Handle reset packet. |
| 3180 | */ |
| 3181 | |
| 3182 | case 15: |
| 3183 | if (remain < 2) |
| 3184 | goto done; |
| 3185 | |
| 3186 | plen = 2 + b[1]; |
| 3187 | |
| 3188 | if (remain < plen) |
| 3189 | goto done; |
| 3190 | |
| 3191 | nd->nd_tx_work = 1; |
| 3192 | |
| 3193 | n = b[plen]; |
| 3194 | b[plen] = 0; |
| 3195 | |
| 3196 | b[plen] = n; |
| 3197 | |
| 3198 | error = "Client Reset Acknowledge"; |
| 3199 | goto prot_error; |
| 3200 | |
| 3201 | default: |
| 3202 | goto decode_error; |
| 3203 | } |
| 3204 | break; |
| 3205 | |
| 3206 | default: |
| 3207 | goto decode_error; |
| 3208 | } |
| 3209 | |
| 3210 | b += plen; |
| 3211 | remain -= plen; |
| 3212 | } |
| 3213 | |
| 3214 | /* |
| 3215 | * When the buffer is exhausted, copy any data left at the |
| 3216 | * top of the buffer back down to the bottom for the next |
| 3217 | * read request. |
| 3218 | */ |
| 3219 | |
| 3220 | done: |
| 3221 | if (remain > 0 && b != buf) |
| 3222 | memcpy(buf, b, remain); |
| 3223 | |
| 3224 | nd->nd_remain = remain; |
| 3225 | return; |
| 3226 | |
| 3227 | /* |
| 3228 | * Handle a decode error. |
| 3229 | */ |
| 3230 | |
| 3231 | decode_error: |
| 3232 | error = "Protocol decode error"; |
| 3233 | |
| 3234 | /* |
| 3235 | * Handle a general protocol error. |
| 3236 | */ |
| 3237 | |
| 3238 | prot_error: |
| 3239 | nd->nd_remain = 0; |
| 3240 | nd->nd_state = NS_SEND_ERROR; |
| 3241 | nd->nd_error = error; |
| 3242 | } |
| 3243 | |
| 3244 | /* |
| 3245 | * dgrp_net_write() -- write data to the network device. |
| 3246 | * |
| 3247 | * A zero byte write indicates that the connection to the RealPort |
| 3248 | * device has been broken. |
| 3249 | * |
| 3250 | * A non-zero write indicates data from the RealPort device. |
| 3251 | */ |
| 3252 | static ssize_t dgrp_net_write(struct file *file, const char __user *buf, |
| 3253 | size_t count, loff_t *ppos) |
| 3254 | { |
| 3255 | struct nd_struct *nd; |
| 3256 | ssize_t rtn = 0; |
| 3257 | long n; |
| 3258 | long total = 0; |
| 3259 | |
| 3260 | /* |
| 3261 | * Get the node pointer, and quit if it doesn't exist. |
| 3262 | */ |
| 3263 | nd = (struct nd_struct *)(file->private_data); |
| 3264 | if (!nd) |
| 3265 | return -ENXIO; |
| 3266 | |
| 3267 | /* |
| 3268 | * Grab the NET lock. |
| 3269 | */ |
| 3270 | down(&nd->nd_net_semaphore); |
| 3271 | |
| 3272 | nd->nd_write_count++; |
| 3273 | |
| 3274 | /* |
| 3275 | * Handle disconnect. |
| 3276 | */ |
| 3277 | |
| 3278 | if (count == 0) { |
| 3279 | dgrp_net_idle(nd); |
| 3280 | /* |
| 3281 | * Set the active port count to zero. |
| 3282 | */ |
| 3283 | dgrp_chan_count(nd, 0); |
| 3284 | goto unlock; |
| 3285 | } |
| 3286 | |
| 3287 | /* |
| 3288 | * Loop to process entire receive packet. |
| 3289 | */ |
| 3290 | |
| 3291 | while (count > 0) { |
| 3292 | n = UIO_MAX - nd->nd_remain; |
| 3293 | |
| 3294 | if (n > count) |
| 3295 | n = count; |
| 3296 | |
| 3297 | nd->nd_rx_byte += n + nd->nd_link.lk_header_size; |
| 3298 | |
| 3299 | rtn = copy_from_user(nd->nd_iobuf + nd->nd_remain, |
| 3300 | (void __user *) buf + total, n); |
| 3301 | if (rtn) { |
| 3302 | rtn = -EFAULT; |
| 3303 | goto unlock; |
| 3304 | } |
| 3305 | |
| 3306 | *ppos += n; |
| 3307 | |
| 3308 | total += n; |
| 3309 | |
| 3310 | count -= n; |
| 3311 | |
| 3312 | if (nd->nd_mon_buf) |
| 3313 | dgrp_monitor_data(nd, RPDUMP_SERVER, |
| 3314 | nd->nd_iobuf + nd->nd_remain, n); |
| 3315 | |
| 3316 | nd->nd_remain += n; |
| 3317 | |
| 3318 | dgrp_receive(nd); |
| 3319 | } |
| 3320 | |
| 3321 | rtn = total; |
| 3322 | |
| 3323 | unlock: |
| 3324 | /* |
| 3325 | * Release the NET lock. |
| 3326 | */ |
| 3327 | up(&nd->nd_net_semaphore); |
| 3328 | |
| 3329 | return rtn; |
| 3330 | } |
| 3331 | |
| 3332 | |
| 3333 | /* |
| 3334 | * dgrp_net_select() |
| 3335 | * Determine whether a device is ready to be read or written to, and |
| 3336 | * sleep if not. |
| 3337 | */ |
| 3338 | static unsigned int dgrp_net_select(struct file *file, |
| 3339 | struct poll_table_struct *table) |
| 3340 | { |
| 3341 | unsigned int retval = 0; |
| 3342 | struct nd_struct *nd = file->private_data; |
| 3343 | |
| 3344 | poll_wait(file, &nd->nd_tx_waitq, table); |
| 3345 | |
| 3346 | if (nd->nd_tx_ready) |
| 3347 | retval |= POLLIN | POLLRDNORM; /* Conditionally readable */ |
| 3348 | |
| 3349 | retval |= POLLOUT | POLLWRNORM; /* Always writeable */ |
| 3350 | |
| 3351 | return retval; |
| 3352 | } |
| 3353 | |
| 3354 | /* |
| 3355 | * dgrp_net_ioctl |
| 3356 | * |
| 3357 | * Implement those functions which allow the network daemon to control |
| 3358 | * the network parameters in the driver. The ioctls include ones to |
| 3359 | * get and set the link speed parameters for the PortServer. |
| 3360 | */ |
| 3361 | static long dgrp_net_ioctl(struct file *file, unsigned int cmd, |
| 3362 | unsigned long arg) |
| 3363 | { |
| 3364 | struct nd_struct *nd; |
| 3365 | int rtn = 0; |
| 3366 | long size = _IOC_SIZE(cmd); |
| 3367 | struct link_struct link; |
| 3368 | |
| 3369 | nd = file->private_data; |
| 3370 | |
| 3371 | if (_IOC_DIR(cmd) & _IOC_READ) |
| 3372 | rtn = access_ok(VERIFY_WRITE, (void __user *) arg, size); |
| 3373 | else if (_IOC_DIR(cmd) & _IOC_WRITE) |
| 3374 | rtn = access_ok(VERIFY_READ, (void __user *) arg, size); |
| 3375 | |
| 3376 | if (!rtn) |
| 3377 | return rtn; |
| 3378 | |
| 3379 | switch (cmd) { |
| 3380 | case DIGI_SETLINK: |
| 3381 | if (size != sizeof(struct link_struct)) |
| 3382 | return -EINVAL; |
| 3383 | |
Guenter Roeck | c9cf272 | 2013-02-28 11:46:57 -0800 | [diff] [blame] | 3384 | if (copy_from_user(&link, (void __user *)arg, size)) |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 3385 | return -EFAULT; |
| 3386 | |
| 3387 | if (link.lk_fast_rate < 9600) |
| 3388 | link.lk_fast_rate = 9600; |
| 3389 | |
| 3390 | if (link.lk_slow_rate < 2400) |
| 3391 | link.lk_slow_rate = 2400; |
| 3392 | |
| 3393 | if (link.lk_fast_rate > 10000000) |
| 3394 | link.lk_fast_rate = 10000000; |
| 3395 | |
| 3396 | if (link.lk_slow_rate > link.lk_fast_rate) |
| 3397 | link.lk_slow_rate = link.lk_fast_rate; |
| 3398 | |
| 3399 | if (link.lk_fast_delay > 2000) |
| 3400 | link.lk_fast_delay = 2000; |
| 3401 | |
| 3402 | if (link.lk_slow_delay > 10000) |
| 3403 | link.lk_slow_delay = 10000; |
| 3404 | |
| 3405 | if (link.lk_fast_delay < 60) |
| 3406 | link.lk_fast_delay = 60; |
| 3407 | |
| 3408 | if (link.lk_slow_delay < link.lk_fast_delay) |
| 3409 | link.lk_slow_delay = link.lk_fast_delay; |
| 3410 | |
| 3411 | if (link.lk_header_size < 2) |
| 3412 | link.lk_header_size = 2; |
| 3413 | |
| 3414 | if (link.lk_header_size > 128) |
| 3415 | link.lk_header_size = 128; |
| 3416 | |
| 3417 | link.lk_fast_rate /= 8 * 1000 / dgrp_poll_tick; |
| 3418 | link.lk_slow_rate /= 8 * 1000 / dgrp_poll_tick; |
| 3419 | |
| 3420 | link.lk_fast_delay /= dgrp_poll_tick; |
| 3421 | link.lk_slow_delay /= dgrp_poll_tick; |
| 3422 | |
| 3423 | nd->nd_link = link; |
| 3424 | |
| 3425 | break; |
| 3426 | |
| 3427 | case DIGI_GETLINK: |
| 3428 | if (size != sizeof(struct link_struct)) |
| 3429 | return -EINVAL; |
| 3430 | |
| 3431 | if (copy_to_user((void __user *)arg, (void *)(&nd->nd_link), |
| 3432 | size)) |
| 3433 | return -EFAULT; |
| 3434 | |
| 3435 | break; |
| 3436 | |
| 3437 | default: |
| 3438 | return -EINVAL; |
| 3439 | |
| 3440 | } |
| 3441 | |
| 3442 | return 0; |
| 3443 | } |
| 3444 | |
| 3445 | /** |
| 3446 | * dgrp_poll_handler() -- handler for poll timer |
| 3447 | * |
| 3448 | * As each timer expires, it determines (a) whether the "transmit" |
| 3449 | * waiter needs to be woken up, and (b) whether the poller needs to |
| 3450 | * be rescheduled. |
| 3451 | */ |
| 3452 | void dgrp_poll_handler(unsigned long arg) |
| 3453 | { |
| 3454 | struct dgrp_poll_data *poll_data; |
| 3455 | struct nd_struct *nd; |
| 3456 | struct link_struct *lk; |
| 3457 | ulong time; |
| 3458 | ulong poll_time; |
| 3459 | ulong freq; |
| 3460 | ulong lock_flags; |
| 3461 | |
| 3462 | poll_data = (struct dgrp_poll_data *) arg; |
| 3463 | freq = 1000 / poll_data->poll_tick; |
| 3464 | poll_data->poll_round += 17; |
| 3465 | |
| 3466 | if (poll_data->poll_round >= freq) |
| 3467 | poll_data->poll_round -= freq; |
| 3468 | |
| 3469 | /* |
| 3470 | * Loop to process all open nodes. |
| 3471 | * |
| 3472 | * For each node, determine the rate at which it should |
| 3473 | * be transmitting data. Then if the node should wake up |
| 3474 | * and transmit data now, enable the net receive select |
| 3475 | * to get the transmit going. |
| 3476 | */ |
| 3477 | |
| 3478 | list_for_each_entry(nd, &nd_struct_list, list) { |
| 3479 | |
| 3480 | lk = &nd->nd_link; |
| 3481 | |
| 3482 | /* |
| 3483 | * Decrement statistics. These are only for use with |
| 3484 | * KME, so don't worry that the operations are done |
Masanari Iida | a547e5e | 2012-11-17 16:43:25 +0900 | [diff] [blame] | 3485 | * unlocked, and so the results are occasionally wrong. |
Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 3486 | */ |
| 3487 | |
| 3488 | nd->nd_read_count -= (nd->nd_read_count + |
| 3489 | poll_data->poll_round) / freq; |
| 3490 | nd->nd_write_count -= (nd->nd_write_count + |
| 3491 | poll_data->poll_round) / freq; |
| 3492 | nd->nd_send_count -= (nd->nd_send_count + |
| 3493 | poll_data->poll_round) / freq; |
| 3494 | nd->nd_tx_byte -= (nd->nd_tx_byte + |
| 3495 | poll_data->poll_round) / freq; |
| 3496 | nd->nd_rx_byte -= (nd->nd_rx_byte + |
| 3497 | poll_data->poll_round) / freq; |
| 3498 | |
| 3499 | /* |
| 3500 | * Wake the daemon to transmit data only when there is |
| 3501 | * enough byte credit to send data. |
| 3502 | * |
| 3503 | * The results are approximate because the operations |
| 3504 | * are performed unlocked, and we are inspecting |
| 3505 | * data asynchronously updated elsewhere. The whole |
| 3506 | * thing is just approximation anyway, so that should |
| 3507 | * be okay. |
| 3508 | */ |
| 3509 | |
| 3510 | if (lk->lk_slow_rate >= UIO_MAX) { |
| 3511 | |
| 3512 | nd->nd_delay = 0; |
| 3513 | nd->nd_rate = UIO_MAX; |
| 3514 | |
| 3515 | nd->nd_tx_deposit = nd->nd_tx_charge + 3 * UIO_MAX; |
| 3516 | nd->nd_tx_credit = 3 * UIO_MAX; |
| 3517 | |
| 3518 | } else { |
| 3519 | |
| 3520 | long rate; |
| 3521 | long delay; |
| 3522 | long deposit; |
| 3523 | long charge; |
| 3524 | long size; |
| 3525 | long excess; |
| 3526 | |
| 3527 | long seq_in = nd->nd_seq_in; |
| 3528 | long seq_out = nd->nd_seq_out; |
| 3529 | |
| 3530 | /* |
| 3531 | * If there are no outstanding packets, run at the |
| 3532 | * fastest rate. |
| 3533 | */ |
| 3534 | |
| 3535 | if (seq_in == seq_out) { |
| 3536 | delay = 0; |
| 3537 | rate = lk->lk_fast_rate; |
| 3538 | } |
| 3539 | |
| 3540 | /* |
| 3541 | * Otherwise compute the transmit rate based on the |
| 3542 | * delay since the oldest packet. |
| 3543 | */ |
| 3544 | |
| 3545 | else { |
| 3546 | /* |
| 3547 | * The actual delay is computed as the |
| 3548 | * time since the oldest unacknowledged |
| 3549 | * packet was sent, minus the time it |
| 3550 | * took to send that packet to the server. |
| 3551 | */ |
| 3552 | |
| 3553 | delay = ((jiffies - nd->nd_seq_time[seq_out]) |
| 3554 | - (nd->nd_seq_size[seq_out] / |
| 3555 | lk->lk_fast_rate)); |
| 3556 | |
| 3557 | /* |
| 3558 | * If the delay is less than the "fast" |
| 3559 | * delay, transmit full speed. If greater |
| 3560 | * than the "slow" delay, transmit at the |
| 3561 | * "slow" speed. In between, interpolate |
| 3562 | * between the fast and slow speeds. |
| 3563 | */ |
| 3564 | |
| 3565 | rate = |
| 3566 | (delay <= lk->lk_fast_delay ? |
| 3567 | lk->lk_fast_rate : |
| 3568 | delay >= lk->lk_slow_delay ? |
| 3569 | lk->lk_slow_rate : |
| 3570 | (lk->lk_slow_rate + |
| 3571 | (lk->lk_slow_delay - delay) * |
| 3572 | (lk->lk_fast_rate - lk->lk_slow_rate) / |
| 3573 | (lk->lk_slow_delay - lk->lk_fast_delay) |
| 3574 | ) |
| 3575 | ); |
| 3576 | } |
| 3577 | |
| 3578 | nd->nd_delay = delay; |
| 3579 | nd->nd_rate = rate; |
| 3580 | |
| 3581 | /* |
| 3582 | * Increase the transmit credit by depositing the |
| 3583 | * current transmit rate. |
| 3584 | */ |
| 3585 | |
| 3586 | deposit = nd->nd_tx_deposit; |
| 3587 | charge = nd->nd_tx_charge; |
| 3588 | |
| 3589 | deposit += rate; |
| 3590 | |
| 3591 | /* |
| 3592 | * If the available transmit credit becomes too large, |
| 3593 | * reduce the deposit to correct the value. |
| 3594 | * |
| 3595 | * Too large is the max of: |
| 3596 | * 6 times the header size |
| 3597 | * 3 times the current transmit rate. |
| 3598 | */ |
| 3599 | |
| 3600 | size = 2 * nd->nd_link.lk_header_size; |
| 3601 | |
| 3602 | if (size < rate) |
| 3603 | size = rate; |
| 3604 | |
| 3605 | size *= 3; |
| 3606 | |
| 3607 | excess = deposit - charge - size; |
| 3608 | |
| 3609 | if (excess > 0) |
| 3610 | deposit -= excess; |
| 3611 | |
| 3612 | nd->nd_tx_deposit = deposit; |
| 3613 | nd->nd_tx_credit = deposit - charge; |
| 3614 | |
| 3615 | /* |
| 3616 | * Wake the transmit task only if the transmit credit |
| 3617 | * is at least 3 times the transmit header size. |
| 3618 | */ |
| 3619 | |
| 3620 | size = 3 * lk->lk_header_size; |
| 3621 | |
| 3622 | if (nd->nd_tx_credit < size) |
| 3623 | continue; |
| 3624 | } |
| 3625 | |
| 3626 | |
| 3627 | /* |
| 3628 | * Enable the READ select to wake the daemon if there |
| 3629 | * is useful work for the drp_read routine to perform. |
| 3630 | */ |
| 3631 | |
| 3632 | if (waitqueue_active(&nd->nd_tx_waitq) && |
| 3633 | (nd->nd_tx_work != 0 || |
| 3634 | (ulong)(jiffies - nd->nd_tx_time) >= IDLE_MAX)) { |
| 3635 | nd->nd_tx_ready = 1; |
| 3636 | |
| 3637 | wake_up_interruptible(&nd->nd_tx_waitq); |
| 3638 | |
| 3639 | /* not needed */ |
| 3640 | /* nd->nd_flag &= ~ND_SELECT; */ |
| 3641 | } |
| 3642 | } |
| 3643 | |
| 3644 | |
| 3645 | /* |
| 3646 | * Schedule ourself back at the nominal wakeup interval. |
| 3647 | */ |
| 3648 | spin_lock_irqsave(&poll_data->poll_lock, lock_flags); |
| 3649 | |
| 3650 | poll_data->node_active_count--; |
| 3651 | if (poll_data->node_active_count > 0) { |
| 3652 | poll_data->node_active_count++; |
| 3653 | poll_time = poll_data->timer.expires + |
| 3654 | poll_data->poll_tick * HZ / 1000; |
| 3655 | |
| 3656 | time = poll_time - jiffies; |
| 3657 | |
| 3658 | if (time >= 2 * poll_data->poll_tick) |
| 3659 | poll_time = jiffies + dgrp_poll_tick * HZ / 1000; |
| 3660 | |
| 3661 | poll_data->timer.expires = poll_time; |
| 3662 | add_timer(&poll_data->timer); |
| 3663 | } |
| 3664 | |
| 3665 | spin_unlock_irqrestore(&poll_data->poll_lock, lock_flags); |
| 3666 | } |