| 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: irlap_event.c |
| 4 | * Version: 0.9 |
| 5 | * Description: IrLAP state machine implementation |
| 6 | * Status: Experimental. |
| 7 | * Author: Dag Brattli <dag@brattli.net> |
| 8 | * Created at: Sat Aug 16 00:59:29 1997 |
| 9 | * Modified at: Sat Dec 25 21:07:57 1999 |
| 10 | * Modified by: Dag Brattli <dag@brattli.net> |
| 11 | * |
| 12 | * Copyright (c) 1998-2000 Dag Brattli <dag@brattli.net>, |
| 13 | * Copyright (c) 1998 Thomas Davis <ratbert@radiks.net> |
| 14 | * All Rights Reserved. |
| 15 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License as |
| 19 | * published by the Free Software Foundation; either version 2 of |
| 20 | * the License, or (at your option) any later version. |
| 21 | * |
| 22 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
| 23 | * provide warranty for any of this software. This material is |
| 24 | * provided "AS-IS" and at no charge. |
| 25 | * |
| 26 | ********************************************************************/ |
| 27 | |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/skbuff.h> |
| 32 | |
| 33 | #include <net/irda/irda.h> |
| 34 | #include <net/irda/irlap_event.h> |
| 35 | |
| 36 | #include <net/irda/timer.h> |
| 37 | #include <net/irda/irlap.h> |
| 38 | #include <net/irda/irlap_frame.h> |
| 39 | #include <net/irda/qos.h> |
| 40 | #include <net/irda/parameters.h> |
| 41 | #include <net/irda/irlmp.h> /* irlmp_flow_indication(), ... */ |
| 42 | |
| 43 | #include <net/irda/irda_device.h> |
| 44 | |
| 45 | #ifdef CONFIG_IRDA_FAST_RR |
| 46 | int sysctl_fast_poll_increase = 50; |
| 47 | #endif |
| 48 | |
| 49 | static int irlap_state_ndm (struct irlap_cb *self, IRLAP_EVENT event, |
| 50 | struct sk_buff *skb, struct irlap_info *info); |
| 51 | static int irlap_state_query (struct irlap_cb *self, IRLAP_EVENT event, |
| 52 | struct sk_buff *skb, struct irlap_info *info); |
| 53 | static int irlap_state_reply (struct irlap_cb *self, IRLAP_EVENT event, |
| 54 | struct sk_buff *skb, struct irlap_info *info); |
| 55 | static int irlap_state_conn (struct irlap_cb *self, IRLAP_EVENT event, |
| 56 | struct sk_buff *skb, struct irlap_info *info); |
| 57 | static int irlap_state_setup (struct irlap_cb *self, IRLAP_EVENT event, |
| 58 | struct sk_buff *skb, struct irlap_info *info); |
| 59 | static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, |
| 60 | struct sk_buff *skb, struct irlap_info *info); |
| 61 | static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event, |
| 62 | struct sk_buff *skb, struct irlap_info *info); |
| 63 | static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event, |
| 64 | struct sk_buff *skb, struct irlap_info *info); |
| 65 | static int irlap_state_nrm_p (struct irlap_cb *self, IRLAP_EVENT event, |
| 66 | struct sk_buff *skb, struct irlap_info *info); |
| 67 | static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, |
| 68 | struct sk_buff *skb, struct irlap_info *info); |
| 69 | static int irlap_state_reset (struct irlap_cb *self, IRLAP_EVENT event, |
| 70 | struct sk_buff *skb, struct irlap_info *info); |
| 71 | static int irlap_state_nrm_s (struct irlap_cb *self, IRLAP_EVENT event, |
| 72 | struct sk_buff *skb, struct irlap_info *info); |
| 73 | static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event, |
| 74 | struct sk_buff *skb, struct irlap_info *info); |
| 75 | static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event, |
| 76 | struct sk_buff *skb, struct irlap_info *info); |
| 77 | static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event, |
| 78 | struct sk_buff *, struct irlap_info *); |
| 79 | |
| 80 | #ifdef CONFIG_IRDA_DEBUG |
| 81 | static const char *irlap_event[] = { |
| 82 | "DISCOVERY_REQUEST", |
| 83 | "CONNECT_REQUEST", |
| 84 | "CONNECT_RESPONSE", |
| 85 | "DISCONNECT_REQUEST", |
| 86 | "DATA_REQUEST", |
| 87 | "RESET_REQUEST", |
| 88 | "RESET_RESPONSE", |
| 89 | "SEND_I_CMD", |
| 90 | "SEND_UI_FRAME", |
| 91 | "RECV_DISCOVERY_XID_CMD", |
| 92 | "RECV_DISCOVERY_XID_RSP", |
| 93 | "RECV_SNRM_CMD", |
| 94 | "RECV_TEST_CMD", |
| 95 | "RECV_TEST_RSP", |
| 96 | "RECV_UA_RSP", |
| 97 | "RECV_DM_RSP", |
| 98 | "RECV_RD_RSP", |
| 99 | "RECV_I_CMD", |
| 100 | "RECV_I_RSP", |
| 101 | "RECV_UI_FRAME", |
| 102 | "RECV_FRMR_RSP", |
| 103 | "RECV_RR_CMD", |
| 104 | "RECV_RR_RSP", |
| 105 | "RECV_RNR_CMD", |
| 106 | "RECV_RNR_RSP", |
| 107 | "RECV_REJ_CMD", |
| 108 | "RECV_REJ_RSP", |
| 109 | "RECV_SREJ_CMD", |
| 110 | "RECV_SREJ_RSP", |
| 111 | "RECV_DISC_CMD", |
| 112 | "SLOT_TIMER_EXPIRED", |
| 113 | "QUERY_TIMER_EXPIRED", |
| 114 | "FINAL_TIMER_EXPIRED", |
| 115 | "POLL_TIMER_EXPIRED", |
| 116 | "DISCOVERY_TIMER_EXPIRED", |
| 117 | "WD_TIMER_EXPIRED", |
| 118 | "BACKOFF_TIMER_EXPIRED", |
| 119 | "MEDIA_BUSY_TIMER_EXPIRED", |
| 120 | }; |
| 121 | #endif /* CONFIG_IRDA_DEBUG */ |
| 122 | |
| 123 | const char *irlap_state[] = { |
| 124 | "LAP_NDM", |
| 125 | "LAP_QUERY", |
| 126 | "LAP_REPLY", |
| 127 | "LAP_CONN", |
| 128 | "LAP_SETUP", |
| 129 | "LAP_OFFLINE", |
| 130 | "LAP_XMIT_P", |
| 131 | "LAP_PCLOSE", |
| 132 | "LAP_NRM_P", |
| 133 | "LAP_RESET_WAIT", |
| 134 | "LAP_RESET", |
| 135 | "LAP_NRM_S", |
| 136 | "LAP_XMIT_S", |
| 137 | "LAP_SCLOSE", |
| 138 | "LAP_RESET_CHECK", |
| 139 | }; |
| 140 | |
| 141 | static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event, |
| 142 | struct sk_buff *skb, struct irlap_info *info) = |
| 143 | { |
| 144 | irlap_state_ndm, |
| 145 | irlap_state_query, |
| 146 | irlap_state_reply, |
| 147 | irlap_state_conn, |
| 148 | irlap_state_setup, |
| 149 | irlap_state_offline, |
| 150 | irlap_state_xmit_p, |
| 151 | irlap_state_pclose, |
| 152 | irlap_state_nrm_p, |
| 153 | irlap_state_reset_wait, |
| 154 | irlap_state_reset, |
| 155 | irlap_state_nrm_s, |
| 156 | irlap_state_xmit_s, |
| 157 | irlap_state_sclose, |
| 158 | irlap_state_reset_check, |
| 159 | }; |
| 160 | |
| 161 | /* |
| 162 | * Function irda_poll_timer_expired (data) |
| 163 | * |
| 164 | * Poll timer has expired. Normally we must now send a RR frame to the |
| 165 | * remote device |
| 166 | */ |
| 167 | static void irlap_poll_timer_expired(void *data) |
| 168 | { |
| 169 | struct irlap_cb *self = (struct irlap_cb *) data; |
| 170 | |
| 171 | IRDA_ASSERT(self != NULL, return;); |
| 172 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 173 | |
| 174 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Calculate and set time before we will have to send back the pf bit |
| 179 | * to the peer. Use in primary. |
| 180 | * Make sure that state is XMIT_P/XMIT_S when calling this function |
| 181 | * (and that nobody messed up with the state). - Jean II |
| 182 | */ |
| 183 | static void irlap_start_poll_timer(struct irlap_cb *self, int timeout) |
| 184 | { |
| 185 | IRDA_ASSERT(self != NULL, return;); |
| 186 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 187 | |
| 188 | #ifdef CONFIG_IRDA_FAST_RR |
| 189 | /* |
| 190 | * Send out the RR frames faster if our own transmit queue is empty, or |
| 191 | * if the peer is busy. The effect is a much faster conversation |
| 192 | */ |
| 193 | if (skb_queue_empty(&self->txq) || self->remote_busy) { |
| 194 | if (self->fast_RR == TRUE) { |
| 195 | /* |
| 196 | * Assert that the fast poll timer has not reached the |
| 197 | * normal poll timer yet |
| 198 | */ |
| 199 | if (self->fast_RR_timeout < timeout) { |
| 200 | /* |
| 201 | * FIXME: this should be a more configurable |
| 202 | * function |
| 203 | */ |
| 204 | self->fast_RR_timeout += |
| 205 | (sysctl_fast_poll_increase * HZ/1000); |
| 206 | |
| 207 | /* Use this fast(er) timeout instead */ |
| 208 | timeout = self->fast_RR_timeout; |
| 209 | } |
| 210 | } else { |
| 211 | self->fast_RR = TRUE; |
| 212 | |
| 213 | /* Start with just 0 ms */ |
| 214 | self->fast_RR_timeout = 0; |
| 215 | timeout = 0; |
| 216 | } |
| 217 | } else |
| 218 | self->fast_RR = FALSE; |
| 219 | |
| 220 | IRDA_DEBUG(3, "%s(), timeout=%d (%ld)\n", __func__, timeout, jiffies); |
| 221 | #endif /* CONFIG_IRDA_FAST_RR */ |
| 222 | |
| 223 | if (timeout == 0) |
| 224 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); |
| 225 | else |
| 226 | irda_start_timer(&self->poll_timer, timeout, self, |
| 227 | irlap_poll_timer_expired); |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Function irlap_do_event (event, skb, info) |
| 232 | * |
| 233 | * Rushes through the state machine without any delay. If state == XMIT |
| 234 | * then send queued data frames. |
| 235 | */ |
| 236 | void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event, |
| 237 | struct sk_buff *skb, struct irlap_info *info) |
| 238 | { |
| 239 | int ret; |
| 240 | |
| 241 | if (!self || self->magic != LAP_MAGIC) |
| 242 | return; |
| 243 | |
| 244 | IRDA_DEBUG(3, "%s(), event = %s, state = %s\n", __func__, |
| 245 | irlap_event[event], irlap_state[self->state]); |
| 246 | |
| 247 | ret = (*state[self->state])(self, event, skb, info); |
| 248 | |
| 249 | /* |
| 250 | * Check if there are any pending events that needs to be executed |
| 251 | */ |
| 252 | switch (self->state) { |
| 253 | case LAP_XMIT_P: /* FALLTHROUGH */ |
| 254 | case LAP_XMIT_S: |
| 255 | /* |
| 256 | * We just received the pf bit and are at the beginning |
| 257 | * of a new LAP transmit window. |
| 258 | * Check if there are any queued data frames, and do not |
| 259 | * try to disconnect link if we send any data frames, since |
| 260 | * that will change the state away form XMIT |
| 261 | */ |
| 262 | IRDA_DEBUG(2, "%s() : queue len = %d\n", __func__, |
| 263 | skb_queue_len(&self->txq)); |
| 264 | |
| 265 | if (!skb_queue_empty(&self->txq)) { |
| 266 | /* Prevent race conditions with irlap_data_request() */ |
| 267 | self->local_busy = TRUE; |
| 268 | |
| 269 | /* Theory of operation. |
| 270 | * We send frames up to when we fill the window or |
| 271 | * reach line capacity. Those frames will queue up |
| 272 | * in the device queue, and the driver will slowly |
| 273 | * send them. |
| 274 | * After each frame that we send, we poll the higher |
| 275 | * layer for more data. It's the right time to do |
| 276 | * that because the link layer need to perform the mtt |
| 277 | * and then send the first frame, so we can afford |
| 278 | * to send a bit of time in kernel space. |
| 279 | * The explicit flow indication allow to minimise |
| 280 | * buffers (== lower latency), to avoid higher layer |
| 281 | * polling via timers (== less context switches) and |
| 282 | * to implement a crude scheduler - Jean II */ |
| 283 | |
| 284 | /* Try to send away all queued data frames */ |
| 285 | while ((skb = skb_dequeue(&self->txq)) != NULL) { |
| 286 | /* Send one frame */ |
| 287 | ret = (*state[self->state])(self, SEND_I_CMD, |
| 288 | skb, NULL); |
| 289 | /* Drop reference count. |
| 290 | * It will be increase as needed in |
| 291 | * irlap_send_data_xxx() */ |
| 292 | kfree_skb(skb); |
| 293 | |
| 294 | /* Poll the higher layers for one more frame */ |
| 295 | irlmp_flow_indication(self->notify.instance, |
| 296 | FLOW_START); |
| 297 | |
| 298 | if (ret == -EPROTO) |
| 299 | break; /* Try again later! */ |
| 300 | } |
| 301 | /* Finished transmitting */ |
| 302 | self->local_busy = FALSE; |
| 303 | } else if (self->disconnect_pending) { |
| 304 | self->disconnect_pending = FALSE; |
| 305 | |
| 306 | ret = (*state[self->state])(self, DISCONNECT_REQUEST, |
| 307 | NULL, NULL); |
| 308 | } |
| 309 | break; |
| 310 | /* case LAP_NDM: */ |
| 311 | /* case LAP_CONN: */ |
| 312 | /* case LAP_RESET_WAIT: */ |
| 313 | /* case LAP_RESET_CHECK: */ |
| 314 | default: |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * Function irlap_state_ndm (event, skb, frame) |
| 321 | * |
| 322 | * NDM (Normal Disconnected Mode) state |
| 323 | * |
| 324 | */ |
| 325 | static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event, |
| 326 | struct sk_buff *skb, struct irlap_info *info) |
| 327 | { |
| 328 | discovery_t *discovery_rsp; |
| 329 | int ret = 0; |
| 330 | |
| 331 | IRDA_ASSERT(self != NULL, return -1;); |
| 332 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 333 | |
| 334 | switch (event) { |
| 335 | case CONNECT_REQUEST: |
| 336 | IRDA_ASSERT(self->netdev != NULL, return -1;); |
| 337 | |
| 338 | if (self->media_busy) { |
| 339 | /* Note : this will never happen, because we test |
| 340 | * media busy in irlap_connect_request() and |
| 341 | * postpone the event... - Jean II */ |
| 342 | IRDA_DEBUG(0, "%s(), CONNECT_REQUEST: media busy!\n", |
| 343 | __func__); |
| 344 | |
| 345 | /* Always switch state before calling upper layers */ |
| 346 | irlap_next_state(self, LAP_NDM); |
| 347 | |
| 348 | irlap_disconnect_indication(self, LAP_MEDIA_BUSY); |
| 349 | } else { |
| 350 | irlap_send_snrm_frame(self, &self->qos_rx); |
| 351 | |
| 352 | /* Start Final-bit timer */ |
| 353 | irlap_start_final_timer(self, self->final_timeout); |
| 354 | |
| 355 | self->retry_count = 0; |
| 356 | irlap_next_state(self, LAP_SETUP); |
| 357 | } |
| 358 | break; |
| 359 | case RECV_SNRM_CMD: |
| 360 | /* Check if the frame contains and I field */ |
| 361 | if (info) { |
| 362 | self->daddr = info->daddr; |
| 363 | self->caddr = info->caddr; |
| 364 | |
| 365 | irlap_next_state(self, LAP_CONN); |
| 366 | |
| 367 | irlap_connect_indication(self, skb); |
| 368 | } else { |
| 369 | IRDA_DEBUG(0, "%s(), SNRM frame does not " |
| 370 | "contain an I field!\n", __func__); |
| 371 | } |
| 372 | break; |
| 373 | case DISCOVERY_REQUEST: |
| 374 | IRDA_ASSERT(info != NULL, return -1;); |
| 375 | |
| 376 | if (self->media_busy) { |
| 377 | IRDA_DEBUG(1, "%s(), DISCOVERY_REQUEST: media busy!\n", |
| 378 | __func__); |
| 379 | /* irlap->log.condition = MEDIA_BUSY; */ |
| 380 | |
| 381 | /* This will make IrLMP try again */ |
| 382 | irlap_discovery_confirm(self, NULL); |
| 383 | /* Note : the discovery log is not cleaned up here, |
| 384 | * it will be done in irlap_discovery_request() |
| 385 | * Jean II */ |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | self->S = info->S; |
| 390 | self->s = info->s; |
| 391 | irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE, |
| 392 | info->discovery); |
| 393 | self->frame_sent = FALSE; |
| 394 | self->s++; |
| 395 | |
| 396 | irlap_start_slot_timer(self, self->slot_timeout); |
| 397 | irlap_next_state(self, LAP_QUERY); |
| 398 | break; |
| 399 | case RECV_DISCOVERY_XID_CMD: |
| 400 | IRDA_ASSERT(info != NULL, return -1;); |
| 401 | |
| 402 | /* Assert that this is not the final slot */ |
| 403 | if (info->s <= info->S) { |
| 404 | self->slot = irlap_generate_rand_time_slot(info->S, |
| 405 | info->s); |
| 406 | if (self->slot == info->s) { |
| 407 | discovery_rsp = irlmp_get_discovery_response(); |
| 408 | discovery_rsp->data.daddr = info->daddr; |
| 409 | |
| 410 | irlap_send_discovery_xid_frame(self, info->S, |
| 411 | self->slot, |
| 412 | FALSE, |
| 413 | discovery_rsp); |
| 414 | self->frame_sent = TRUE; |
| 415 | } else |
| 416 | self->frame_sent = FALSE; |
| 417 | |
| 418 | /* |
| 419 | * Go to reply state until end of discovery to |
| 420 | * inhibit our own transmissions. Set the timer |
| 421 | * to not stay forever there... Jean II |
| 422 | */ |
| 423 | irlap_start_query_timer(self, info->S, info->s); |
| 424 | irlap_next_state(self, LAP_REPLY); |
| 425 | } else { |
| 426 | /* This is the final slot. How is it possible ? |
| 427 | * This would happen is both discoveries are just slightly |
| 428 | * offset (if they are in sync, all packets are lost). |
| 429 | * Most often, all the discovery requests will be received |
| 430 | * in QUERY state (see my comment there), except for the |
| 431 | * last frame that will come here. |
| 432 | * The big trouble when it happen is that active discovery |
| 433 | * doesn't happen, because nobody answer the discoveries |
| 434 | * frame of the other guy, so the log shows up empty. |
| 435 | * What should we do ? |
| 436 | * Not much. It's too late to answer those discovery frames, |
| 437 | * so we just pass the info to IrLMP who will put it in the |
| 438 | * log (and post an event). |
| 439 | * Another cause would be devices that do discovery much |
| 440 | * slower than us, however the latest fixes should minimise |
| 441 | * those cases... |
| 442 | * Jean II |
| 443 | */ |
| 444 | IRDA_DEBUG(1, "%s(), Receiving final discovery request, missed the discovery slots :-(\n", __func__); |
| 445 | |
| 446 | /* Last discovery request -> in the log */ |
| 447 | irlap_discovery_indication(self, info->discovery); |
| 448 | } |
| 449 | break; |
| 450 | case MEDIA_BUSY_TIMER_EXPIRED: |
| 451 | /* A bunch of events may be postponed because the media is |
| 452 | * busy (usually immediately after we close a connection), |
| 453 | * or while we are doing discovery (state query/reply). |
| 454 | * In all those cases, the media busy flag will be cleared |
| 455 | * when it's OK for us to process those postponed events. |
| 456 | * This event is not mentioned in the state machines in the |
| 457 | * IrLAP spec. It's because they didn't consider Ultra and |
| 458 | * postponing connection request is optional. |
| 459 | * Jean II */ |
| 460 | #ifdef CONFIG_IRDA_ULTRA |
| 461 | /* Send any pending Ultra frames if any */ |
| 462 | if (!skb_queue_empty(&self->txq_ultra)) { |
| 463 | /* We don't send the frame, just post an event. |
| 464 | * Also, previously this code was in timer.c... |
| 465 | * Jean II */ |
| 466 | ret = (*state[self->state])(self, SEND_UI_FRAME, |
| 467 | NULL, NULL); |
| 468 | } |
| 469 | #endif /* CONFIG_IRDA_ULTRA */ |
| 470 | /* Check if we should try to connect. |
| 471 | * This code was previously in irlap_do_event() */ |
| 472 | if (self->connect_pending) { |
| 473 | self->connect_pending = FALSE; |
| 474 | |
| 475 | /* This one *should* not pend in this state, except |
| 476 | * if a socket try to connect and immediately |
| 477 | * disconnect. - clear - Jean II */ |
| 478 | if (self->disconnect_pending) |
| 479 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 480 | else |
| 481 | ret = (*state[self->state])(self, |
| 482 | CONNECT_REQUEST, |
| 483 | NULL, NULL); |
| 484 | self->disconnect_pending = FALSE; |
| 485 | } |
| 486 | /* Note : one way to test if this code works well (including |
| 487 | * media busy and small busy) is to create a user space |
| 488 | * application generating an Ultra packet every 3.05 sec (or |
| 489 | * 2.95 sec) and to see how it interact with discovery. |
| 490 | * It's fairly easy to check that no packet is lost, that the |
| 491 | * packets are postponed during discovery and that after |
| 492 | * discovery indication you have a 100ms "gap". |
| 493 | * As connection request and Ultra are now processed the same |
| 494 | * way, this avoid the tedious job of trying IrLAP connection |
| 495 | * in all those cases... |
| 496 | * Jean II */ |
| 497 | break; |
| 498 | #ifdef CONFIG_IRDA_ULTRA |
| 499 | case SEND_UI_FRAME: |
| 500 | { |
| 501 | int i; |
| 502 | /* Only allowed to repeat an operation twice */ |
| 503 | for (i=0; ((i<2) && (self->media_busy == FALSE)); i++) { |
| 504 | skb = skb_dequeue(&self->txq_ultra); |
| 505 | if (skb) |
| 506 | irlap_send_ui_frame(self, skb, CBROADCAST, |
| 507 | CMD_FRAME); |
| 508 | else |
| 509 | break; |
| 510 | /* irlap_send_ui_frame() won't increase skb reference |
| 511 | * count, so no dev_kfree_skb() - Jean II */ |
| 512 | } |
| 513 | if (i == 2) { |
| 514 | /* Force us to listen 500 ms again */ |
| 515 | irda_device_set_media_busy(self->netdev, TRUE); |
| 516 | } |
| 517 | break; |
| 518 | } |
| 519 | case RECV_UI_FRAME: |
| 520 | /* Only accept broadcast frames in NDM mode */ |
| 521 | if (info->caddr != CBROADCAST) { |
| 522 | IRDA_DEBUG(0, "%s(), not a broadcast frame!\n", |
| 523 | __func__); |
| 524 | } else |
| 525 | irlap_unitdata_indication(self, skb); |
| 526 | break; |
| 527 | #endif /* CONFIG_IRDA_ULTRA */ |
| 528 | case RECV_TEST_CMD: |
| 529 | /* Remove test frame header */ |
| 530 | skb_pull(skb, sizeof(struct test_frame)); |
| 531 | |
| 532 | /* |
| 533 | * Send response. This skb will not be sent out again, and |
| 534 | * will only be used to send out the same info as the cmd |
| 535 | */ |
| 536 | irlap_send_test_frame(self, CBROADCAST, info->daddr, skb); |
| 537 | break; |
| 538 | case RECV_TEST_RSP: |
| 539 | IRDA_DEBUG(0, "%s() not implemented!\n", __func__); |
| 540 | break; |
| 541 | default: |
| 542 | IRDA_DEBUG(2, "%s(), Unknown event %s\n", __func__, |
| 543 | irlap_event[event]); |
| 544 | |
| 545 | ret = -1; |
| 546 | break; |
| 547 | } |
| 548 | return ret; |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * Function irlap_state_query (event, skb, info) |
| 553 | * |
| 554 | * QUERY state |
| 555 | * |
| 556 | */ |
| 557 | static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event, |
| 558 | struct sk_buff *skb, struct irlap_info *info) |
| 559 | { |
| 560 | int ret = 0; |
| 561 | |
| 562 | IRDA_ASSERT(self != NULL, return -1;); |
| 563 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 564 | |
| 565 | switch (event) { |
| 566 | case RECV_DISCOVERY_XID_RSP: |
| 567 | IRDA_ASSERT(info != NULL, return -1;); |
| 568 | IRDA_ASSERT(info->discovery != NULL, return -1;); |
| 569 | |
| 570 | IRDA_DEBUG(4, "%s(), daddr=%08x\n", __func__, |
| 571 | info->discovery->data.daddr); |
| 572 | |
| 573 | if (!self->discovery_log) { |
| 574 | IRDA_WARNING("%s: discovery log is gone! " |
| 575 | "maybe the discovery timeout has been set" |
| 576 | " too short?\n", __func__); |
| 577 | break; |
| 578 | } |
| 579 | hashbin_insert(self->discovery_log, |
| 580 | (irda_queue_t *) info->discovery, |
| 581 | info->discovery->data.daddr, NULL); |
| 582 | |
| 583 | /* Keep state */ |
| 584 | /* irlap_next_state(self, LAP_QUERY); */ |
| 585 | |
| 586 | break; |
| 587 | case RECV_DISCOVERY_XID_CMD: |
| 588 | /* Yes, it is possible to receive those frames in this mode. |
| 589 | * Note that most often the last discovery request won't |
| 590 | * occur here but in NDM state (see my comment there). |
| 591 | * What should we do ? |
| 592 | * Not much. We are currently performing our own discovery, |
| 593 | * therefore we can't answer those frames. We don't want |
| 594 | * to change state either. We just pass the info to |
| 595 | * IrLMP who will put it in the log (and post an event). |
| 596 | * Jean II |
| 597 | */ |
| 598 | |
| 599 | IRDA_ASSERT(info != NULL, return -1;); |
| 600 | |
| 601 | IRDA_DEBUG(1, "%s(), Receiving discovery request (s = %d) while performing discovery :-(\n", __func__, info->s); |
| 602 | |
| 603 | /* Last discovery request ? */ |
| 604 | if (info->s == 0xff) |
| 605 | irlap_discovery_indication(self, info->discovery); |
| 606 | break; |
| 607 | case SLOT_TIMER_EXPIRED: |
| 608 | /* |
| 609 | * Wait a little longer if we detect an incoming frame. This |
| 610 | * is not mentioned in the spec, but is a good thing to do, |
| 611 | * since we want to work even with devices that violate the |
| 612 | * timing requirements. |
| 613 | */ |
| 614 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { |
| 615 | IRDA_DEBUG(2, "%s(), device is slow to answer, " |
| 616 | "waiting some more!\n", __func__); |
| 617 | irlap_start_slot_timer(self, msecs_to_jiffies(10)); |
| 618 | self->add_wait = TRUE; |
| 619 | return ret; |
| 620 | } |
| 621 | self->add_wait = FALSE; |
| 622 | |
| 623 | if (self->s < self->S) { |
| 624 | irlap_send_discovery_xid_frame(self, self->S, |
| 625 | self->s, TRUE, |
| 626 | self->discovery_cmd); |
| 627 | self->s++; |
| 628 | irlap_start_slot_timer(self, self->slot_timeout); |
| 629 | |
| 630 | /* Keep state */ |
| 631 | irlap_next_state(self, LAP_QUERY); |
| 632 | } else { |
| 633 | /* This is the final slot! */ |
| 634 | irlap_send_discovery_xid_frame(self, self->S, 0xff, |
| 635 | TRUE, |
| 636 | self->discovery_cmd); |
| 637 | |
| 638 | /* Always switch state before calling upper layers */ |
| 639 | irlap_next_state(self, LAP_NDM); |
| 640 | |
| 641 | /* |
| 642 | * We are now finished with the discovery procedure, |
| 643 | * so now we must return the results |
| 644 | */ |
| 645 | irlap_discovery_confirm(self, self->discovery_log); |
| 646 | |
| 647 | /* IrLMP should now have taken care of the log */ |
| 648 | self->discovery_log = NULL; |
| 649 | } |
| 650 | break; |
| 651 | default: |
| 652 | IRDA_DEBUG(2, "%s(), Unknown event %s\n", __func__, |
| 653 | irlap_event[event]); |
| 654 | |
| 655 | ret = -1; |
| 656 | break; |
| 657 | } |
| 658 | return ret; |
| 659 | } |
| 660 | |
| 661 | /* |
| 662 | * Function irlap_state_reply (self, event, skb, info) |
| 663 | * |
| 664 | * REPLY, we have received a XID discovery frame from a device and we |
| 665 | * are waiting for the right time slot to send a response XID frame |
| 666 | * |
| 667 | */ |
| 668 | static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event, |
| 669 | struct sk_buff *skb, struct irlap_info *info) |
| 670 | { |
| 671 | discovery_t *discovery_rsp; |
| 672 | int ret=0; |
| 673 | |
| 674 | IRDA_DEBUG(4, "%s()\n", __func__); |
| 675 | |
| 676 | IRDA_ASSERT(self != NULL, return -1;); |
| 677 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 678 | |
| 679 | switch (event) { |
| 680 | case QUERY_TIMER_EXPIRED: |
| 681 | IRDA_DEBUG(0, "%s(), QUERY_TIMER_EXPIRED <%ld>\n", |
| 682 | __func__, jiffies); |
| 683 | irlap_next_state(self, LAP_NDM); |
| 684 | break; |
| 685 | case RECV_DISCOVERY_XID_CMD: |
| 686 | IRDA_ASSERT(info != NULL, return -1;); |
| 687 | /* Last frame? */ |
| 688 | if (info->s == 0xff) { |
| 689 | del_timer(&self->query_timer); |
| 690 | |
| 691 | /* info->log.condition = REMOTE; */ |
| 692 | |
| 693 | /* Always switch state before calling upper layers */ |
| 694 | irlap_next_state(self, LAP_NDM); |
| 695 | |
| 696 | irlap_discovery_indication(self, info->discovery); |
| 697 | } else { |
| 698 | /* If it's our slot, send our reply */ |
| 699 | if ((info->s >= self->slot) && (!self->frame_sent)) { |
| 700 | discovery_rsp = irlmp_get_discovery_response(); |
| 701 | discovery_rsp->data.daddr = info->daddr; |
| 702 | |
| 703 | irlap_send_discovery_xid_frame(self, info->S, |
| 704 | self->slot, |
| 705 | FALSE, |
| 706 | discovery_rsp); |
| 707 | |
| 708 | self->frame_sent = TRUE; |
| 709 | } |
| 710 | /* Readjust our timer to accomodate devices |
| 711 | * doing faster or slower discovery than us... |
| 712 | * Jean II */ |
| 713 | irlap_start_query_timer(self, info->S, info->s); |
| 714 | |
| 715 | /* Keep state */ |
| 716 | //irlap_next_state(self, LAP_REPLY); |
| 717 | } |
| 718 | break; |
| 719 | default: |
| 720 | IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __func__, |
| 721 | event, irlap_event[event]); |
| 722 | |
| 723 | ret = -1; |
| 724 | break; |
| 725 | } |
| 726 | return ret; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Function irlap_state_conn (event, skb, info) |
| 731 | * |
| 732 | * CONN, we have received a SNRM command and is waiting for the upper |
| 733 | * layer to accept or refuse connection |
| 734 | * |
| 735 | */ |
| 736 | static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event, |
| 737 | struct sk_buff *skb, struct irlap_info *info) |
| 738 | { |
| 739 | int ret = 0; |
| 740 | |
| 741 | IRDA_DEBUG(4, "%s(), event=%s\n", __func__, irlap_event[ event]); |
| 742 | |
| 743 | IRDA_ASSERT(self != NULL, return -1;); |
| 744 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 745 | |
| 746 | switch (event) { |
| 747 | case CONNECT_RESPONSE: |
| 748 | skb_pull(skb, sizeof(struct snrm_frame)); |
| 749 | |
| 750 | IRDA_ASSERT(self->netdev != NULL, return -1;); |
| 751 | |
| 752 | irlap_qos_negotiate(self, skb); |
| 753 | |
| 754 | irlap_initiate_connection_state(self); |
| 755 | |
| 756 | /* |
| 757 | * Applying the parameters now will make sure we change speed |
| 758 | * *after* we have sent the next frame |
| 759 | */ |
| 760 | irlap_apply_connection_parameters(self, FALSE); |
| 761 | |
| 762 | /* |
| 763 | * Sending this frame will force a speed change after it has |
| 764 | * been sent (i.e. the frame will be sent at 9600). |
| 765 | */ |
| 766 | irlap_send_ua_response_frame(self, &self->qos_rx); |
| 767 | |
| 768 | #if 0 |
| 769 | /* |
| 770 | * We are allowed to send two frames, but this may increase |
| 771 | * the connect latency, so lets not do it for now. |
| 772 | */ |
| 773 | /* This is full of good intentions, but doesn't work in |
| 774 | * practice. |
| 775 | * After sending the first UA response, we switch the |
| 776 | * dongle to the negotiated speed, which is usually |
| 777 | * different than 9600 kb/s. |
| 778 | * From there, there is two solutions : |
| 779 | * 1) The other end has received the first UA response : |
| 780 | * it will set up the connection, move to state LAP_NRM_P, |
| 781 | * and will ignore and drop the second UA response. |
| 782 | * Actually, it's even worse : the other side will almost |
| 783 | * immediately send a RR that will likely collide with the |
| 784 | * UA response (depending on negotiated turnaround). |
| 785 | * 2) The other end has not received the first UA response, |
| 786 | * will stay at 9600 and will never see the second UA response. |
| 787 | * Jean II */ |
| 788 | irlap_send_ua_response_frame(self, &self->qos_rx); |
| 789 | #endif |
| 790 | |
| 791 | /* |
| 792 | * The WD-timer could be set to the duration of the P-timer |
| 793 | * for this case, but it is recommended to use twice the |
| 794 | * value (note 3 IrLAP p. 60). |
| 795 | */ |
| 796 | irlap_start_wd_timer(self, self->wd_timeout); |
| 797 | irlap_next_state(self, LAP_NRM_S); |
| 798 | |
| 799 | break; |
| 800 | case RECV_DISCOVERY_XID_CMD: |
| 801 | IRDA_DEBUG(3, "%s(), event RECV_DISCOVER_XID_CMD!\n", |
| 802 | __func__); |
| 803 | irlap_next_state(self, LAP_NDM); |
| 804 | |
| 805 | break; |
| 806 | case DISCONNECT_REQUEST: |
| 807 | IRDA_DEBUG(0, "%s(), Disconnect request!\n", __func__); |
| 808 | irlap_send_dm_frame(self); |
| 809 | irlap_next_state( self, LAP_NDM); |
| 810 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 811 | break; |
| 812 | default: |
| 813 | IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __func__, |
| 814 | event, irlap_event[event]); |
| 815 | |
| 816 | ret = -1; |
| 817 | break; |
| 818 | } |
| 819 | |
| 820 | return ret; |
| 821 | } |
| 822 | |
| 823 | /* |
| 824 | * Function irlap_state_setup (event, skb, frame) |
| 825 | * |
| 826 | * SETUP state, The local layer has transmitted a SNRM command frame to |
| 827 | * a remote peer layer and is awaiting a reply . |
| 828 | * |
| 829 | */ |
| 830 | static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event, |
| 831 | struct sk_buff *skb, struct irlap_info *info) |
| 832 | { |
| 833 | int ret = 0; |
| 834 | |
| 835 | IRDA_DEBUG(4, "%s()\n", __func__); |
| 836 | |
| 837 | IRDA_ASSERT(self != NULL, return -1;); |
| 838 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 839 | |
| 840 | switch (event) { |
| 841 | case FINAL_TIMER_EXPIRED: |
| 842 | if (self->retry_count < self->N3) { |
| 843 | /* |
| 844 | * Perform random backoff, Wait a random number of time units, minimum |
| 845 | * duration half the time taken to transmitt a SNRM frame, maximum duration |
| 846 | * 1.5 times the time taken to transmit a SNRM frame. So this time should |
| 847 | * between 15 msecs and 45 msecs. |
| 848 | */ |
| 849 | irlap_start_backoff_timer(self, msecs_to_jiffies(20 + |
| 850 | (jiffies % 30))); |
| 851 | } else { |
| 852 | /* Always switch state before calling upper layers */ |
| 853 | irlap_next_state(self, LAP_NDM); |
| 854 | |
| 855 | irlap_disconnect_indication(self, LAP_FOUND_NONE); |
| 856 | } |
| 857 | break; |
| 858 | case BACKOFF_TIMER_EXPIRED: |
| 859 | irlap_send_snrm_frame(self, &self->qos_rx); |
| 860 | irlap_start_final_timer(self, self->final_timeout); |
| 861 | self->retry_count++; |
| 862 | break; |
| 863 | case RECV_SNRM_CMD: |
| 864 | IRDA_DEBUG(4, "%s(), SNRM battle!\n", __func__); |
| 865 | |
| 866 | IRDA_ASSERT(skb != NULL, return 0;); |
| 867 | IRDA_ASSERT(info != NULL, return 0;); |
| 868 | |
| 869 | /* |
| 870 | * The device with the largest device address wins the battle |
| 871 | * (both have sent a SNRM command!) |
| 872 | */ |
| 873 | if (info &&(info->daddr > self->saddr)) { |
| 874 | del_timer(&self->final_timer); |
| 875 | irlap_initiate_connection_state(self); |
| 876 | |
| 877 | IRDA_ASSERT(self->netdev != NULL, return -1;); |
| 878 | |
| 879 | skb_pull(skb, sizeof(struct snrm_frame)); |
| 880 | |
| 881 | irlap_qos_negotiate(self, skb); |
| 882 | |
| 883 | /* Send UA frame and then change link settings */ |
| 884 | irlap_apply_connection_parameters(self, FALSE); |
| 885 | irlap_send_ua_response_frame(self, &self->qos_rx); |
| 886 | |
| 887 | irlap_next_state(self, LAP_NRM_S); |
| 888 | irlap_connect_confirm(self, skb); |
| 889 | |
| 890 | /* |
| 891 | * The WD-timer could be set to the duration of the |
| 892 | * P-timer for this case, but it is recommended |
| 893 | * to use twice the value (note 3 IrLAP p. 60). |
| 894 | */ |
| 895 | irlap_start_wd_timer(self, self->wd_timeout); |
| 896 | } else { |
| 897 | /* We just ignore the other device! */ |
| 898 | irlap_next_state(self, LAP_SETUP); |
| 899 | } |
| 900 | break; |
| 901 | case RECV_UA_RSP: |
| 902 | /* Stop F-timer */ |
| 903 | del_timer(&self->final_timer); |
| 904 | |
| 905 | /* Initiate connection state */ |
| 906 | irlap_initiate_connection_state(self); |
| 907 | |
| 908 | /* Negotiate connection parameters */ |
| 909 | IRDA_ASSERT(skb->len > 10, return -1;); |
| 910 | |
| 911 | skb_pull(skb, sizeof(struct ua_frame)); |
| 912 | |
| 913 | IRDA_ASSERT(self->netdev != NULL, return -1;); |
| 914 | |
| 915 | irlap_qos_negotiate(self, skb); |
| 916 | |
| 917 | /* Set the new link setting *now* (before the rr frame) */ |
| 918 | irlap_apply_connection_parameters(self, TRUE); |
| 919 | self->retry_count = 0; |
| 920 | |
| 921 | /* Wait for turnaround time to give a chance to the other |
| 922 | * device to be ready to receive us. |
| 923 | * Note : the time to switch speed is typically larger |
| 924 | * than the turnaround time, but as we don't have the other |
| 925 | * side speed switch time, that's our best guess... |
| 926 | * Jean II */ |
| 927 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 928 | |
| 929 | /* This frame will actually be sent at the new speed */ |
| 930 | irlap_send_rr_frame(self, CMD_FRAME); |
| 931 | |
| 932 | /* The timer is set to half the normal timer to quickly |
| 933 | * detect a failure to negociate the new connection |
| 934 | * parameters. IrLAP 6.11.3.2, note 3. |
| 935 | * Note that currently we don't process this failure |
| 936 | * properly, as we should do a quick disconnect. |
| 937 | * Jean II */ |
| 938 | irlap_start_final_timer(self, self->final_timeout/2); |
| 939 | irlap_next_state(self, LAP_NRM_P); |
| 940 | |
| 941 | irlap_connect_confirm(self, skb); |
| 942 | break; |
| 943 | case RECV_DM_RSP: /* FALLTHROUGH */ |
| 944 | case RECV_DISC_CMD: |
| 945 | del_timer(&self->final_timer); |
| 946 | irlap_next_state(self, LAP_NDM); |
| 947 | |
| 948 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 949 | break; |
| 950 | default: |
| 951 | IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __func__, |
| 952 | event, irlap_event[event]); |
| 953 | |
| 954 | ret = -1; |
| 955 | break; |
| 956 | } |
| 957 | return ret; |
| 958 | } |
| 959 | |
| 960 | /* |
| 961 | * Function irlap_state_offline (self, event, skb, info) |
| 962 | * |
| 963 | * OFFLINE state, not used for now! |
| 964 | * |
| 965 | */ |
| 966 | static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, |
| 967 | struct sk_buff *skb, struct irlap_info *info) |
| 968 | { |
| 969 | IRDA_DEBUG( 0, "%s(), Unknown event\n", __func__); |
| 970 | |
| 971 | return -1; |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * Function irlap_state_xmit_p (self, event, skb, info) |
| 976 | * |
| 977 | * XMIT, Only the primary station has right to transmit, and we |
| 978 | * therefore do not expect to receive any transmissions from other |
| 979 | * stations. |
| 980 | * |
| 981 | */ |
| 982 | static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event, |
| 983 | struct sk_buff *skb, struct irlap_info *info) |
| 984 | { |
| 985 | int ret = 0; |
| 986 | |
| 987 | switch (event) { |
| 988 | case SEND_I_CMD: |
| 989 | /* |
| 990 | * Only send frame if send-window > 0. |
| 991 | */ |
| 992 | if ((self->window > 0) && (!self->remote_busy)) { |
| 993 | int nextfit; |
| 994 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| 995 | struct sk_buff *skb_next; |
| 996 | |
| 997 | /* With DYNAMIC_WINDOW, we keep the window size |
| 998 | * maximum, and adapt on the packets we are sending. |
| 999 | * At 115k, we can send only 2 packets of 2048 bytes |
| 1000 | * in a 500 ms turnaround. Without this option, we |
| 1001 | * would always limit the window to 2. With this |
| 1002 | * option, if we send smaller packets, we can send |
| 1003 | * up to 7 of them (always depending on QoS). |
| 1004 | * Jean II */ |
| 1005 | |
| 1006 | /* Look at the next skb. This is safe, as we are |
| 1007 | * the only consumer of the Tx queue (if we are not, |
| 1008 | * we have other problems) - Jean II */ |
| 1009 | skb_next = skb_peek(&self->txq); |
| 1010 | |
| 1011 | /* Check if a subsequent skb exist and would fit in |
| 1012 | * the current window (with respect to turnaround |
| 1013 | * time). |
| 1014 | * This allow us to properly mark the current packet |
| 1015 | * with the pf bit, to avoid falling back on the |
| 1016 | * second test below, and avoid waiting the |
| 1017 | * end of the window and sending a extra RR. |
| 1018 | * Note : (skb_next != NULL) <=> (skb_queue_len() > 0) |
| 1019 | * Jean II */ |
| 1020 | nextfit = ((skb_next != NULL) && |
| 1021 | ((skb_next->len + skb->len) <= |
| 1022 | self->bytes_left)); |
| 1023 | |
| 1024 | /* |
| 1025 | * The current packet may not fit ! Because of test |
| 1026 | * above, this should not happen any more !!! |
| 1027 | * Test if we have transmitted more bytes over the |
| 1028 | * link than its possible to do with the current |
| 1029 | * speed and turn-around-time. |
| 1030 | */ |
| 1031 | if((!nextfit) && (skb->len > self->bytes_left)) { |
| 1032 | IRDA_DEBUG(0, "%s(), Not allowed to transmit" |
| 1033 | " more bytes!\n", __func__); |
| 1034 | /* Requeue the skb */ |
| 1035 | skb_queue_head(&self->txq, skb_get(skb)); |
| 1036 | /* |
| 1037 | * We should switch state to LAP_NRM_P, but |
| 1038 | * that is not possible since we must be sure |
| 1039 | * that we poll the other side. Since we have |
| 1040 | * used up our time, the poll timer should |
| 1041 | * trigger anyway now, so we just wait for it |
| 1042 | * DB |
| 1043 | */ |
| 1044 | /* |
| 1045 | * Sorry, but that's not totally true. If |
| 1046 | * we send 2000B packets, we may wait another |
| 1047 | * 1000B until our turnaround expire. That's |
| 1048 | * why we need to be proactive in avoiding |
| 1049 | * coming here. - Jean II |
| 1050 | */ |
| 1051 | return -EPROTO; |
| 1052 | } |
| 1053 | |
| 1054 | /* Substract space used by this skb */ |
| 1055 | self->bytes_left -= skb->len; |
| 1056 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1057 | /* Window has been adjusted for the max packet |
| 1058 | * size, so much simpler... - Jean II */ |
| 1059 | nextfit = !skb_queue_empty(&self->txq); |
| 1060 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1061 | /* |
| 1062 | * Send data with poll bit cleared only if window > 1 |
| 1063 | * and there is more frames after this one to be sent |
| 1064 | */ |
| 1065 | if ((self->window > 1) && (nextfit)) { |
| 1066 | /* More packet to send in current window */ |
| 1067 | irlap_send_data_primary(self, skb); |
| 1068 | irlap_next_state(self, LAP_XMIT_P); |
| 1069 | } else { |
| 1070 | /* Final packet of window */ |
| 1071 | irlap_send_data_primary_poll(self, skb); |
| 1072 | |
| 1073 | /* |
| 1074 | * Make sure state machine does not try to send |
| 1075 | * any more frames |
| 1076 | */ |
| 1077 | ret = -EPROTO; |
| 1078 | } |
| 1079 | #ifdef CONFIG_IRDA_FAST_RR |
| 1080 | /* Peer may want to reply immediately */ |
| 1081 | self->fast_RR = FALSE; |
| 1082 | #endif /* CONFIG_IRDA_FAST_RR */ |
| 1083 | } else { |
| 1084 | IRDA_DEBUG(4, "%s(), Unable to send! remote busy?\n", |
| 1085 | __func__); |
| 1086 | skb_queue_head(&self->txq, skb_get(skb)); |
| 1087 | |
| 1088 | /* |
| 1089 | * The next ret is important, because it tells |
| 1090 | * irlap_next_state _not_ to deliver more frames |
| 1091 | */ |
| 1092 | ret = -EPROTO; |
| 1093 | } |
| 1094 | break; |
| 1095 | case POLL_TIMER_EXPIRED: |
| 1096 | IRDA_DEBUG(3, "%s(), POLL_TIMER_EXPIRED <%ld>\n", |
| 1097 | __func__, jiffies); |
| 1098 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1099 | /* Return to NRM properly - Jean II */ |
| 1100 | self->window = self->window_size; |
| 1101 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| 1102 | /* Allowed to transmit a maximum number of bytes again. */ |
| 1103 | self->bytes_left = self->line_capacity; |
| 1104 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1105 | irlap_start_final_timer(self, self->final_timeout); |
| 1106 | irlap_next_state(self, LAP_NRM_P); |
| 1107 | break; |
| 1108 | case DISCONNECT_REQUEST: |
| 1109 | del_timer(&self->poll_timer); |
| 1110 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1111 | irlap_send_disc_frame(self); |
| 1112 | irlap_flush_all_queues(self); |
| 1113 | irlap_start_final_timer(self, self->final_timeout); |
| 1114 | self->retry_count = 0; |
| 1115 | irlap_next_state(self, LAP_PCLOSE); |
| 1116 | break; |
| 1117 | case DATA_REQUEST: |
| 1118 | /* Nothing to do, irlap_do_event() will send the packet |
| 1119 | * when we return... - Jean II */ |
| 1120 | break; |
| 1121 | default: |
| 1122 | IRDA_DEBUG(0, "%s(), Unknown event %s\n", |
| 1123 | __func__, irlap_event[event]); |
| 1124 | |
| 1125 | ret = -EINVAL; |
| 1126 | break; |
| 1127 | } |
| 1128 | return ret; |
| 1129 | } |
| 1130 | |
| 1131 | /* |
| 1132 | * Function irlap_state_pclose (event, skb, info) |
| 1133 | * |
| 1134 | * PCLOSE state |
| 1135 | */ |
| 1136 | static int irlap_state_pclose(struct irlap_cb *self, IRLAP_EVENT event, |
| 1137 | struct sk_buff *skb, struct irlap_info *info) |
| 1138 | { |
| 1139 | int ret = 0; |
| 1140 | |
| 1141 | IRDA_DEBUG(1, "%s()\n", __func__); |
| 1142 | |
| 1143 | IRDA_ASSERT(self != NULL, return -1;); |
| 1144 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 1145 | |
| 1146 | switch (event) { |
| 1147 | case RECV_UA_RSP: /* FALLTHROUGH */ |
| 1148 | case RECV_DM_RSP: |
| 1149 | del_timer(&self->final_timer); |
| 1150 | |
| 1151 | /* Set new link parameters */ |
| 1152 | irlap_apply_default_connection_parameters(self); |
| 1153 | |
| 1154 | /* Always switch state before calling upper layers */ |
| 1155 | irlap_next_state(self, LAP_NDM); |
| 1156 | |
| 1157 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 1158 | break; |
| 1159 | case FINAL_TIMER_EXPIRED: |
| 1160 | if (self->retry_count < self->N3) { |
| 1161 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1162 | irlap_send_disc_frame(self); |
| 1163 | irlap_start_final_timer(self, self->final_timeout); |
| 1164 | self->retry_count++; |
| 1165 | /* Keep state */ |
| 1166 | } else { |
| 1167 | irlap_apply_default_connection_parameters(self); |
| 1168 | |
| 1169 | /* Always switch state before calling upper layers */ |
| 1170 | irlap_next_state(self, LAP_NDM); |
| 1171 | |
| 1172 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); |
| 1173 | } |
| 1174 | break; |
| 1175 | default: |
| 1176 | IRDA_DEBUG(1, "%s(), Unknown event %d\n", __func__, event); |
| 1177 | |
| 1178 | ret = -1; |
| 1179 | break; |
| 1180 | } |
| 1181 | return ret; |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Function irlap_state_nrm_p (self, event, skb, info) |
| 1186 | * |
| 1187 | * NRM_P (Normal Response Mode as Primary), The primary station has given |
| 1188 | * permissions to a secondary station to transmit IrLAP resonse frames |
| 1189 | * (by sending a frame with the P bit set). The primary station will not |
| 1190 | * transmit any frames and is expecting to receive frames only from the |
| 1191 | * secondary to which transmission permissions has been given. |
| 1192 | */ |
| 1193 | static int irlap_state_nrm_p(struct irlap_cb *self, IRLAP_EVENT event, |
| 1194 | struct sk_buff *skb, struct irlap_info *info) |
| 1195 | { |
| 1196 | int ret = 0; |
| 1197 | int ns_status; |
| 1198 | int nr_status; |
| 1199 | |
| 1200 | switch (event) { |
| 1201 | case RECV_I_RSP: /* Optimize for the common case */ |
| 1202 | if (unlikely(skb->len <= LAP_ADDR_HEADER + LAP_CTRL_HEADER)) { |
| 1203 | /* |
| 1204 | * Input validation check: a stir4200/mcp2150 |
| 1205 | * combination sometimes results in an empty i:rsp. |
| 1206 | * This makes no sense; we can just ignore the frame |
| 1207 | * and send an rr:cmd immediately. This happens before |
| 1208 | * changing nr or ns so triggers a retransmit |
| 1209 | */ |
| 1210 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1211 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1212 | /* Keep state */ |
| 1213 | break; |
| 1214 | } |
| 1215 | /* FIXME: must check for remote_busy below */ |
| 1216 | #ifdef CONFIG_IRDA_FAST_RR |
| 1217 | /* |
| 1218 | * Reset the fast_RR so we can use the fast RR code with |
| 1219 | * full speed the next time since peer may have more frames |
| 1220 | * to transmitt |
| 1221 | */ |
| 1222 | self->fast_RR = FALSE; |
| 1223 | #endif /* CONFIG_IRDA_FAST_RR */ |
| 1224 | IRDA_ASSERT( info != NULL, return -1;); |
| 1225 | |
| 1226 | ns_status = irlap_validate_ns_received(self, info->ns); |
| 1227 | nr_status = irlap_validate_nr_received(self, info->nr); |
| 1228 | |
| 1229 | /* |
| 1230 | * Check for expected I(nformation) frame |
| 1231 | */ |
| 1232 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { |
| 1233 | |
| 1234 | /* Update Vr (next frame for us to receive) */ |
| 1235 | self->vr = (self->vr + 1) % 8; |
| 1236 | |
| 1237 | /* Update Nr received, cleanup our retry queue */ |
| 1238 | irlap_update_nr_received(self, info->nr); |
| 1239 | |
| 1240 | /* |
| 1241 | * Got expected NR, so reset the |
| 1242 | * retry_count. This is not done by IrLAP spec, |
| 1243 | * which is strange! |
| 1244 | */ |
| 1245 | self->retry_count = 0; |
| 1246 | self->ack_required = TRUE; |
| 1247 | |
| 1248 | /* poll bit cleared? */ |
| 1249 | if (!info->pf) { |
| 1250 | /* Keep state, do not move this line */ |
| 1251 | irlap_next_state(self, LAP_NRM_P); |
| 1252 | |
| 1253 | irlap_data_indication(self, skb, FALSE); |
| 1254 | } else { |
| 1255 | /* No longer waiting for pf */ |
| 1256 | del_timer(&self->final_timer); |
| 1257 | |
| 1258 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1259 | |
| 1260 | /* Call higher layer *before* changing state |
| 1261 | * to give them a chance to send data in the |
| 1262 | * next LAP frame. |
| 1263 | * Jean II */ |
| 1264 | irlap_data_indication(self, skb, FALSE); |
| 1265 | |
| 1266 | /* XMIT states are the most dangerous state |
| 1267 | * to be in, because user requests are |
| 1268 | * processed directly and may change state. |
| 1269 | * On the other hand, in NDM_P, those |
| 1270 | * requests are queued and we will process |
| 1271 | * them when we return to irlap_do_event(). |
| 1272 | * Jean II |
| 1273 | */ |
| 1274 | irlap_next_state(self, LAP_XMIT_P); |
| 1275 | |
| 1276 | /* This is the last frame. |
| 1277 | * Make sure it's always called in XMIT state. |
| 1278 | * - Jean II */ |
| 1279 | irlap_start_poll_timer(self, self->poll_timeout); |
| 1280 | } |
| 1281 | break; |
| 1282 | |
| 1283 | } |
| 1284 | /* Unexpected next to send (Ns) */ |
| 1285 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) |
| 1286 | { |
| 1287 | if (!info->pf) { |
| 1288 | irlap_update_nr_received(self, info->nr); |
| 1289 | |
| 1290 | /* |
| 1291 | * Wait until the last frame before doing |
| 1292 | * anything |
| 1293 | */ |
| 1294 | |
| 1295 | /* Keep state */ |
| 1296 | irlap_next_state(self, LAP_NRM_P); |
| 1297 | } else { |
| 1298 | IRDA_DEBUG(4, |
| 1299 | "%s(), missing or duplicate frame!\n", |
| 1300 | __func__); |
| 1301 | |
| 1302 | /* Update Nr received */ |
| 1303 | irlap_update_nr_received(self, info->nr); |
| 1304 | |
| 1305 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1306 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1307 | |
| 1308 | self->ack_required = FALSE; |
| 1309 | |
| 1310 | irlap_start_final_timer(self, self->final_timeout); |
| 1311 | irlap_next_state(self, LAP_NRM_P); |
| 1312 | } |
| 1313 | break; |
| 1314 | } |
| 1315 | /* |
| 1316 | * Unexpected next to receive (Nr) |
| 1317 | */ |
| 1318 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) |
| 1319 | { |
| 1320 | if (info->pf) { |
| 1321 | self->vr = (self->vr + 1) % 8; |
| 1322 | |
| 1323 | /* Update Nr received */ |
| 1324 | irlap_update_nr_received(self, info->nr); |
| 1325 | |
| 1326 | /* Resend rejected frames */ |
| 1327 | irlap_resend_rejected_frames(self, CMD_FRAME); |
| 1328 | |
| 1329 | self->ack_required = FALSE; |
| 1330 | |
| 1331 | /* Make sure we account for the time |
| 1332 | * to transmit our frames. See comemnts |
| 1333 | * in irlap_send_data_primary_poll(). |
| 1334 | * Jean II */ |
| 1335 | irlap_start_final_timer(self, 2 * self->final_timeout); |
| 1336 | |
| 1337 | /* Keep state, do not move this line */ |
| 1338 | irlap_next_state(self, LAP_NRM_P); |
| 1339 | |
| 1340 | irlap_data_indication(self, skb, FALSE); |
| 1341 | } else { |
| 1342 | /* |
| 1343 | * Do not resend frames until the last |
| 1344 | * frame has arrived from the other |
| 1345 | * device. This is not documented in |
| 1346 | * IrLAP!! |
| 1347 | */ |
| 1348 | self->vr = (self->vr + 1) % 8; |
| 1349 | |
| 1350 | /* Update Nr received */ |
| 1351 | irlap_update_nr_received(self, info->nr); |
| 1352 | |
| 1353 | self->ack_required = FALSE; |
| 1354 | |
| 1355 | /* Keep state, do not move this line!*/ |
| 1356 | irlap_next_state(self, LAP_NRM_P); |
| 1357 | |
| 1358 | irlap_data_indication(self, skb, FALSE); |
| 1359 | } |
| 1360 | break; |
| 1361 | } |
| 1362 | /* |
| 1363 | * Unexpected next to send (Ns) and next to receive (Nr) |
| 1364 | * Not documented by IrLAP! |
| 1365 | */ |
| 1366 | if ((ns_status == NS_UNEXPECTED) && |
| 1367 | (nr_status == NR_UNEXPECTED)) |
| 1368 | { |
| 1369 | IRDA_DEBUG(4, "%s(), unexpected nr and ns!\n", |
| 1370 | __func__); |
| 1371 | if (info->pf) { |
| 1372 | /* Resend rejected frames */ |
| 1373 | irlap_resend_rejected_frames(self, CMD_FRAME); |
| 1374 | |
| 1375 | /* Give peer some time to retransmit! |
| 1376 | * But account for our own Tx. */ |
| 1377 | irlap_start_final_timer(self, 2 * self->final_timeout); |
| 1378 | |
| 1379 | /* Keep state, do not move this line */ |
| 1380 | irlap_next_state(self, LAP_NRM_P); |
| 1381 | } else { |
| 1382 | /* Update Nr received */ |
| 1383 | /* irlap_update_nr_received( info->nr); */ |
| 1384 | |
| 1385 | self->ack_required = FALSE; |
| 1386 | } |
| 1387 | break; |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Invalid NR or NS |
| 1392 | */ |
| 1393 | if ((nr_status == NR_INVALID) || (ns_status == NS_INVALID)) { |
| 1394 | if (info->pf) { |
| 1395 | del_timer(&self->final_timer); |
| 1396 | |
| 1397 | irlap_next_state(self, LAP_RESET_WAIT); |
| 1398 | |
| 1399 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); |
| 1400 | self->xmitflag = TRUE; |
| 1401 | } else { |
| 1402 | del_timer(&self->final_timer); |
| 1403 | |
| 1404 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); |
| 1405 | |
| 1406 | self->xmitflag = FALSE; |
| 1407 | } |
| 1408 | break; |
| 1409 | } |
| 1410 | IRDA_DEBUG(1, "%s(), Not implemented!\n", __func__); |
| 1411 | IRDA_DEBUG(1, "%s(), event=%s, ns_status=%d, nr_status=%d\n", |
| 1412 | __func__, irlap_event[event], ns_status, nr_status); |
| 1413 | break; |
| 1414 | case RECV_UI_FRAME: |
| 1415 | /* Poll bit cleared? */ |
| 1416 | if (!info->pf) { |
| 1417 | irlap_data_indication(self, skb, TRUE); |
| 1418 | irlap_next_state(self, LAP_NRM_P); |
| 1419 | } else { |
| 1420 | del_timer(&self->final_timer); |
| 1421 | irlap_data_indication(self, skb, TRUE); |
| 1422 | irlap_next_state(self, LAP_XMIT_P); |
| 1423 | IRDA_DEBUG(1, "%s: RECV_UI_FRAME: next state %s\n", __func__, irlap_state[self->state]); |
| 1424 | irlap_start_poll_timer(self, self->poll_timeout); |
| 1425 | } |
| 1426 | break; |
| 1427 | case RECV_RR_RSP: |
| 1428 | /* |
| 1429 | * If you get a RR, the remote isn't busy anymore, |
| 1430 | * no matter what the NR |
| 1431 | */ |
| 1432 | self->remote_busy = FALSE; |
| 1433 | |
| 1434 | /* Stop final timer */ |
| 1435 | del_timer(&self->final_timer); |
| 1436 | |
| 1437 | /* |
| 1438 | * Nr as expected? |
| 1439 | */ |
| 1440 | ret = irlap_validate_nr_received(self, info->nr); |
| 1441 | if (ret == NR_EXPECTED) { |
| 1442 | /* Update Nr received */ |
| 1443 | irlap_update_nr_received(self, info->nr); |
| 1444 | |
| 1445 | /* |
| 1446 | * Got expected NR, so reset the retry_count. This |
| 1447 | * is not done by the IrLAP standard , which is |
| 1448 | * strange! DB. |
| 1449 | */ |
| 1450 | self->retry_count = 0; |
| 1451 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1452 | |
| 1453 | irlap_next_state(self, LAP_XMIT_P); |
| 1454 | |
| 1455 | /* Start poll timer */ |
| 1456 | irlap_start_poll_timer(self, self->poll_timeout); |
| 1457 | } else if (ret == NR_UNEXPECTED) { |
| 1458 | IRDA_ASSERT(info != NULL, return -1;); |
| 1459 | /* |
| 1460 | * Unexpected nr! |
| 1461 | */ |
| 1462 | |
| 1463 | /* Update Nr received */ |
| 1464 | irlap_update_nr_received(self, info->nr); |
| 1465 | |
| 1466 | IRDA_DEBUG(4, "RECV_RR_FRAME: Retrans:%d, nr=%d, va=%d, " |
| 1467 | "vs=%d, vr=%d\n", |
| 1468 | self->retry_count, info->nr, self->va, |
| 1469 | self->vs, self->vr); |
| 1470 | |
| 1471 | /* Resend rejected frames */ |
| 1472 | irlap_resend_rejected_frames(self, CMD_FRAME); |
| 1473 | irlap_start_final_timer(self, self->final_timeout * 2); |
| 1474 | |
| 1475 | irlap_next_state(self, LAP_NRM_P); |
| 1476 | } else if (ret == NR_INVALID) { |
| 1477 | IRDA_DEBUG(1, "%s(), Received RR with " |
| 1478 | "invalid nr !\n", __func__); |
| 1479 | |
| 1480 | irlap_next_state(self, LAP_RESET_WAIT); |
| 1481 | |
| 1482 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); |
| 1483 | self->xmitflag = TRUE; |
| 1484 | } |
| 1485 | break; |
| 1486 | case RECV_RNR_RSP: |
| 1487 | IRDA_ASSERT(info != NULL, return -1;); |
| 1488 | |
| 1489 | /* Stop final timer */ |
| 1490 | del_timer(&self->final_timer); |
| 1491 | self->remote_busy = TRUE; |
| 1492 | |
| 1493 | /* Update Nr received */ |
| 1494 | irlap_update_nr_received(self, info->nr); |
| 1495 | irlap_next_state(self, LAP_XMIT_P); |
| 1496 | |
| 1497 | /* Start poll timer */ |
| 1498 | irlap_start_poll_timer(self, self->poll_timeout); |
| 1499 | break; |
| 1500 | case RECV_FRMR_RSP: |
| 1501 | del_timer(&self->final_timer); |
| 1502 | self->xmitflag = TRUE; |
| 1503 | irlap_next_state(self, LAP_RESET_WAIT); |
| 1504 | irlap_reset_indication(self); |
| 1505 | break; |
| 1506 | case FINAL_TIMER_EXPIRED: |
| 1507 | /* |
| 1508 | * We are allowed to wait for additional 300 ms if |
| 1509 | * final timer expires when we are in the middle |
| 1510 | * of receiving a frame (page 45, IrLAP). Check that |
| 1511 | * we only do this once for each frame. |
| 1512 | */ |
| 1513 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { |
| 1514 | IRDA_DEBUG(1, "FINAL_TIMER_EXPIRED when receiving a " |
| 1515 | "frame! Waiting a little bit more!\n"); |
| 1516 | irlap_start_final_timer(self, msecs_to_jiffies(300)); |
| 1517 | |
| 1518 | /* |
| 1519 | * Don't allow this to happen one more time in a row, |
| 1520 | * or else we can get a pretty tight loop here if |
| 1521 | * if we only receive half a frame. DB. |
| 1522 | */ |
| 1523 | self->add_wait = TRUE; |
| 1524 | break; |
| 1525 | } |
| 1526 | self->add_wait = FALSE; |
| 1527 | |
| 1528 | /* N2 is the disconnect timer. Until we reach it, we retry */ |
| 1529 | if (self->retry_count < self->N2) { |
| 1530 | if (skb_peek(&self->wx_list) == NULL) { |
| 1531 | /* Retry sending the pf bit to the secondary */ |
| 1532 | IRDA_DEBUG(4, "nrm_p: resending rr"); |
| 1533 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1534 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1535 | } else { |
| 1536 | IRDA_DEBUG(4, "nrm_p: resend frames"); |
| 1537 | irlap_resend_rejected_frames(self, CMD_FRAME); |
| 1538 | } |
| 1539 | |
| 1540 | irlap_start_final_timer(self, self->final_timeout); |
| 1541 | self->retry_count++; |
| 1542 | IRDA_DEBUG(4, "irlap_state_nrm_p: FINAL_TIMER_EXPIRED:" |
| 1543 | " retry_count=%d\n", self->retry_count); |
| 1544 | |
| 1545 | /* Early warning event. I'm using a pretty liberal |
| 1546 | * interpretation of the spec and generate an event |
| 1547 | * every time the timer is multiple of N1 (and not |
| 1548 | * only the first time). This allow application |
| 1549 | * to know precisely if connectivity restart... |
| 1550 | * Jean II */ |
| 1551 | if((self->retry_count % self->N1) == 0) |
| 1552 | irlap_status_indication(self, |
| 1553 | STATUS_NO_ACTIVITY); |
| 1554 | |
| 1555 | /* Keep state */ |
| 1556 | } else { |
| 1557 | irlap_apply_default_connection_parameters(self); |
| 1558 | |
| 1559 | /* Always switch state before calling upper layers */ |
| 1560 | irlap_next_state(self, LAP_NDM); |
| 1561 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); |
| 1562 | } |
| 1563 | break; |
| 1564 | case RECV_REJ_RSP: |
| 1565 | irlap_update_nr_received(self, info->nr); |
| 1566 | if (self->remote_busy) { |
| 1567 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1568 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1569 | } else |
| 1570 | irlap_resend_rejected_frames(self, CMD_FRAME); |
| 1571 | irlap_start_final_timer(self, 2 * self->final_timeout); |
| 1572 | break; |
| 1573 | case RECV_SREJ_RSP: |
| 1574 | irlap_update_nr_received(self, info->nr); |
| 1575 | if (self->remote_busy) { |
| 1576 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1577 | irlap_send_rr_frame(self, CMD_FRAME); |
| 1578 | } else |
| 1579 | irlap_resend_rejected_frame(self, CMD_FRAME); |
| 1580 | irlap_start_final_timer(self, 2 * self->final_timeout); |
| 1581 | break; |
| 1582 | case RECV_RD_RSP: |
| 1583 | IRDA_DEBUG(1, "%s(), RECV_RD_RSP\n", __func__); |
| 1584 | |
| 1585 | irlap_flush_all_queues(self); |
| 1586 | irlap_next_state(self, LAP_XMIT_P); |
| 1587 | /* Call back the LAP state machine to do a proper disconnect */ |
| 1588 | irlap_disconnect_request(self); |
| 1589 | break; |
| 1590 | default: |
| 1591 | IRDA_DEBUG(1, "%s(), Unknown event %s\n", |
| 1592 | __func__, irlap_event[event]); |
| 1593 | |
| 1594 | ret = -1; |
| 1595 | break; |
| 1596 | } |
| 1597 | return ret; |
| 1598 | } |
| 1599 | |
| 1600 | /* |
| 1601 | * Function irlap_state_reset_wait (event, skb, info) |
| 1602 | * |
| 1603 | * We have informed the service user of a reset condition, and is |
| 1604 | * awaiting reset of disconnect request. |
| 1605 | * |
| 1606 | */ |
| 1607 | static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, |
| 1608 | struct sk_buff *skb, struct irlap_info *info) |
| 1609 | { |
| 1610 | int ret = 0; |
| 1611 | |
| 1612 | IRDA_DEBUG(3, "%s(), event = %s\n", __func__, irlap_event[event]); |
| 1613 | |
| 1614 | IRDA_ASSERT(self != NULL, return -1;); |
| 1615 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 1616 | |
| 1617 | switch (event) { |
| 1618 | case RESET_REQUEST: |
| 1619 | if (self->xmitflag) { |
| 1620 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1621 | irlap_send_snrm_frame(self, NULL); |
| 1622 | irlap_start_final_timer(self, self->final_timeout); |
| 1623 | irlap_next_state(self, LAP_RESET); |
| 1624 | } else { |
| 1625 | irlap_start_final_timer(self, self->final_timeout); |
| 1626 | irlap_next_state(self, LAP_RESET); |
| 1627 | } |
| 1628 | break; |
| 1629 | case DISCONNECT_REQUEST: |
| 1630 | irlap_wait_min_turn_around( self, &self->qos_tx); |
| 1631 | irlap_send_disc_frame( self); |
| 1632 | irlap_flush_all_queues( self); |
| 1633 | irlap_start_final_timer( self, self->final_timeout); |
| 1634 | self->retry_count = 0; |
| 1635 | irlap_next_state( self, LAP_PCLOSE); |
| 1636 | break; |
| 1637 | default: |
| 1638 | IRDA_DEBUG(2, "%s(), Unknown event %s\n", __func__, |
| 1639 | irlap_event[event]); |
| 1640 | |
| 1641 | ret = -1; |
| 1642 | break; |
| 1643 | } |
| 1644 | return ret; |
| 1645 | } |
| 1646 | |
| 1647 | /* |
| 1648 | * Function irlap_state_reset (self, event, skb, info) |
| 1649 | * |
| 1650 | * We have sent a SNRM reset command to the peer layer, and is awaiting |
| 1651 | * reply. |
| 1652 | * |
| 1653 | */ |
| 1654 | static int irlap_state_reset(struct irlap_cb *self, IRLAP_EVENT event, |
| 1655 | struct sk_buff *skb, struct irlap_info *info) |
| 1656 | { |
| 1657 | int ret = 0; |
| 1658 | |
| 1659 | IRDA_DEBUG(3, "%s(), event = %s\n", __func__, irlap_event[event]); |
| 1660 | |
| 1661 | IRDA_ASSERT(self != NULL, return -1;); |
| 1662 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 1663 | |
| 1664 | switch (event) { |
| 1665 | case RECV_DISC_CMD: |
| 1666 | del_timer(&self->final_timer); |
| 1667 | |
| 1668 | irlap_apply_default_connection_parameters(self); |
| 1669 | |
| 1670 | /* Always switch state before calling upper layers */ |
| 1671 | irlap_next_state(self, LAP_NDM); |
| 1672 | |
| 1673 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); |
| 1674 | |
| 1675 | break; |
| 1676 | case RECV_UA_RSP: |
| 1677 | del_timer(&self->final_timer); |
| 1678 | |
| 1679 | /* Initiate connection state */ |
| 1680 | irlap_initiate_connection_state(self); |
| 1681 | |
| 1682 | irlap_reset_confirm(); |
| 1683 | |
| 1684 | self->remote_busy = FALSE; |
| 1685 | |
| 1686 | irlap_next_state(self, LAP_XMIT_P); |
| 1687 | |
| 1688 | irlap_start_poll_timer(self, self->poll_timeout); |
| 1689 | |
| 1690 | break; |
| 1691 | case FINAL_TIMER_EXPIRED: |
| 1692 | if (self->retry_count < 3) { |
| 1693 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1694 | |
| 1695 | IRDA_ASSERT(self->netdev != NULL, return -1;); |
| 1696 | irlap_send_snrm_frame(self, self->qos_dev); |
| 1697 | |
| 1698 | self->retry_count++; /* Experimental!! */ |
| 1699 | |
| 1700 | irlap_start_final_timer(self, self->final_timeout); |
| 1701 | irlap_next_state(self, LAP_RESET); |
| 1702 | } else if (self->retry_count >= self->N3) { |
| 1703 | irlap_apply_default_connection_parameters(self); |
| 1704 | |
| 1705 | /* Always switch state before calling upper layers */ |
| 1706 | irlap_next_state(self, LAP_NDM); |
| 1707 | |
| 1708 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); |
| 1709 | } |
| 1710 | break; |
| 1711 | case RECV_SNRM_CMD: |
| 1712 | /* |
| 1713 | * SNRM frame is not allowed to contain an I-field in this |
| 1714 | * state |
| 1715 | */ |
| 1716 | if (!info) { |
| 1717 | IRDA_DEBUG(3, "%s(), RECV_SNRM_CMD\n", __func__); |
| 1718 | irlap_initiate_connection_state(self); |
| 1719 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1720 | irlap_send_ua_response_frame(self, &self->qos_rx); |
| 1721 | irlap_reset_confirm(); |
| 1722 | irlap_start_wd_timer(self, self->wd_timeout); |
| 1723 | irlap_next_state(self, LAP_NDM); |
| 1724 | } else { |
| 1725 | IRDA_DEBUG(0, |
| 1726 | "%s(), SNRM frame contained an I field!\n", |
| 1727 | __func__); |
| 1728 | } |
| 1729 | break; |
| 1730 | default: |
| 1731 | IRDA_DEBUG(1, "%s(), Unknown event %s\n", |
| 1732 | __func__, irlap_event[event]); |
| 1733 | |
| 1734 | ret = -1; |
| 1735 | break; |
| 1736 | } |
| 1737 | return ret; |
| 1738 | } |
| 1739 | |
| 1740 | /* |
| 1741 | * Function irlap_state_xmit_s (event, skb, info) |
| 1742 | * |
| 1743 | * XMIT_S, The secondary station has been given the right to transmit, |
| 1744 | * and we therefor do not expect to receive any transmissions from other |
| 1745 | * stations. |
| 1746 | */ |
| 1747 | static int irlap_state_xmit_s(struct irlap_cb *self, IRLAP_EVENT event, |
| 1748 | struct sk_buff *skb, struct irlap_info *info) |
| 1749 | { |
| 1750 | int ret = 0; |
| 1751 | |
| 1752 | IRDA_DEBUG(4, "%s(), event=%s\n", __func__, irlap_event[event]); |
| 1753 | |
| 1754 | IRDA_ASSERT(self != NULL, return -ENODEV;); |
| 1755 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); |
| 1756 | |
| 1757 | switch (event) { |
| 1758 | case SEND_I_CMD: |
| 1759 | /* |
| 1760 | * Send frame only if send window > 0 |
| 1761 | */ |
| 1762 | if ((self->window > 0) && (!self->remote_busy)) { |
| 1763 | int nextfit; |
| 1764 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| 1765 | struct sk_buff *skb_next; |
| 1766 | |
| 1767 | /* |
| 1768 | * Same deal as in irlap_state_xmit_p(), so see |
| 1769 | * the comments at that point. |
| 1770 | * We are the secondary, so there are only subtle |
| 1771 | * differences. - Jean II |
| 1772 | */ |
| 1773 | |
| 1774 | /* Check if a subsequent skb exist and would fit in |
| 1775 | * the current window (with respect to turnaround |
| 1776 | * time). - Jean II */ |
| 1777 | skb_next = skb_peek(&self->txq); |
| 1778 | nextfit = ((skb_next != NULL) && |
| 1779 | ((skb_next->len + skb->len) <= |
| 1780 | self->bytes_left)); |
| 1781 | |
| 1782 | /* |
| 1783 | * Test if we have transmitted more bytes over the |
| 1784 | * link than its possible to do with the current |
| 1785 | * speed and turn-around-time. |
| 1786 | */ |
| 1787 | if((!nextfit) && (skb->len > self->bytes_left)) { |
| 1788 | IRDA_DEBUG(0, "%s(), Not allowed to transmit" |
| 1789 | " more bytes!\n", __func__); |
| 1790 | /* Requeue the skb */ |
| 1791 | skb_queue_head(&self->txq, skb_get(skb)); |
| 1792 | |
| 1793 | /* |
| 1794 | * Switch to NRM_S, this is only possible |
| 1795 | * when we are in secondary mode, since we |
| 1796 | * must be sure that we don't miss any RR |
| 1797 | * frames |
| 1798 | */ |
| 1799 | self->window = self->window_size; |
| 1800 | self->bytes_left = self->line_capacity; |
| 1801 | irlap_start_wd_timer(self, self->wd_timeout); |
| 1802 | |
| 1803 | irlap_next_state(self, LAP_NRM_S); |
| 1804 | /* Slight difference with primary : |
| 1805 | * here we would wait for the other side to |
| 1806 | * expire the turnaround. - Jean II */ |
| 1807 | |
| 1808 | return -EPROTO; /* Try again later */ |
| 1809 | } |
| 1810 | /* Substract space used by this skb */ |
| 1811 | self->bytes_left -= skb->len; |
| 1812 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1813 | /* Window has been adjusted for the max packet |
| 1814 | * size, so much simpler... - Jean II */ |
| 1815 | nextfit = !skb_queue_empty(&self->txq); |
| 1816 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1817 | /* |
| 1818 | * Send data with final bit cleared only if window > 1 |
| 1819 | * and there is more frames to be sent |
| 1820 | */ |
| 1821 | if ((self->window > 1) && (nextfit)) { |
| 1822 | irlap_send_data_secondary(self, skb); |
| 1823 | irlap_next_state(self, LAP_XMIT_S); |
| 1824 | } else { |
| 1825 | irlap_send_data_secondary_final(self, skb); |
| 1826 | irlap_next_state(self, LAP_NRM_S); |
| 1827 | |
| 1828 | /* |
| 1829 | * Make sure state machine does not try to send |
| 1830 | * any more frames |
| 1831 | */ |
| 1832 | ret = -EPROTO; |
| 1833 | } |
| 1834 | } else { |
| 1835 | IRDA_DEBUG(2, "%s(), Unable to send!\n", __func__); |
| 1836 | skb_queue_head(&self->txq, skb_get(skb)); |
| 1837 | ret = -EPROTO; |
| 1838 | } |
| 1839 | break; |
| 1840 | case DISCONNECT_REQUEST: |
| 1841 | irlap_send_rd_frame(self); |
| 1842 | irlap_flush_all_queues(self); |
| 1843 | irlap_start_wd_timer(self, self->wd_timeout); |
| 1844 | irlap_next_state(self, LAP_SCLOSE); |
| 1845 | break; |
| 1846 | case DATA_REQUEST: |
| 1847 | /* Nothing to do, irlap_do_event() will send the packet |
| 1848 | * when we return... - Jean II */ |
| 1849 | break; |
| 1850 | default: |
| 1851 | IRDA_DEBUG(2, "%s(), Unknown event %s\n", __func__, |
| 1852 | irlap_event[event]); |
| 1853 | |
| 1854 | ret = -EINVAL; |
| 1855 | break; |
| 1856 | } |
| 1857 | return ret; |
| 1858 | } |
| 1859 | |
| 1860 | /* |
| 1861 | * Function irlap_state_nrm_s (event, skb, info) |
| 1862 | * |
| 1863 | * NRM_S (Normal Response Mode as Secondary) state, in this state we are |
| 1864 | * expecting to receive frames from the primary station |
| 1865 | * |
| 1866 | */ |
| 1867 | static int irlap_state_nrm_s(struct irlap_cb *self, IRLAP_EVENT event, |
| 1868 | struct sk_buff *skb, struct irlap_info *info) |
| 1869 | { |
| 1870 | int ns_status; |
| 1871 | int nr_status; |
| 1872 | int ret = 0; |
| 1873 | |
| 1874 | IRDA_DEBUG(4, "%s(), event=%s\n", __func__, irlap_event[ event]); |
| 1875 | |
| 1876 | IRDA_ASSERT(self != NULL, return -1;); |
| 1877 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); |
| 1878 | |
| 1879 | switch (event) { |
| 1880 | case RECV_I_CMD: /* Optimize for the common case */ |
| 1881 | /* FIXME: must check for remote_busy below */ |
| 1882 | IRDA_DEBUG(4, "%s(), event=%s nr=%d, vs=%d, ns=%d, " |
| 1883 | "vr=%d, pf=%d\n", __func__, |
| 1884 | irlap_event[event], info->nr, |
| 1885 | self->vs, info->ns, self->vr, info->pf); |
| 1886 | |
| 1887 | self->retry_count = 0; |
| 1888 | |
| 1889 | ns_status = irlap_validate_ns_received(self, info->ns); |
| 1890 | nr_status = irlap_validate_nr_received(self, info->nr); |
| 1891 | /* |
| 1892 | * Check for expected I(nformation) frame |
| 1893 | */ |
| 1894 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { |
| 1895 | |
| 1896 | /* Update Vr (next frame for us to receive) */ |
| 1897 | self->vr = (self->vr + 1) % 8; |
| 1898 | |
| 1899 | /* Update Nr received */ |
| 1900 | irlap_update_nr_received(self, info->nr); |
| 1901 | |
| 1902 | /* |
| 1903 | * poll bit cleared? |
| 1904 | */ |
| 1905 | if (!info->pf) { |
| 1906 | |
| 1907 | self->ack_required = TRUE; |
| 1908 | |
| 1909 | /* |
| 1910 | * Starting WD-timer here is optional, but |
| 1911 | * not recommended. Note 6 IrLAP p. 83 |
| 1912 | */ |
| 1913 | #if 0 |
| 1914 | irda_start_timer(WD_TIMER, self->wd_timeout); |
| 1915 | #endif |
| 1916 | /* Keep state, do not move this line */ |
| 1917 | irlap_next_state(self, LAP_NRM_S); |
| 1918 | |
| 1919 | irlap_data_indication(self, skb, FALSE); |
| 1920 | break; |
| 1921 | } else { |
| 1922 | /* |
| 1923 | * We should wait before sending RR, and |
| 1924 | * also before changing to XMIT_S |
| 1925 | * state. (note 1, IrLAP p. 82) |
| 1926 | */ |
| 1927 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1928 | |
| 1929 | /* |
| 1930 | * Give higher layers a chance to |
| 1931 | * immediately reply with some data before |
| 1932 | * we decide if we should send a RR frame |
| 1933 | * or not |
| 1934 | */ |
| 1935 | irlap_data_indication(self, skb, FALSE); |
| 1936 | |
| 1937 | /* Any pending data requests? */ |
| 1938 | if (!skb_queue_empty(&self->txq) && |
| 1939 | (self->window > 0)) |
| 1940 | { |
| 1941 | self->ack_required = TRUE; |
| 1942 | |
| 1943 | del_timer(&self->wd_timer); |
| 1944 | |
| 1945 | irlap_next_state(self, LAP_XMIT_S); |
| 1946 | } else { |
| 1947 | irlap_send_rr_frame(self, RSP_FRAME); |
| 1948 | irlap_start_wd_timer(self, |
| 1949 | self->wd_timeout); |
| 1950 | |
| 1951 | /* Keep the state */ |
| 1952 | irlap_next_state(self, LAP_NRM_S); |
| 1953 | } |
| 1954 | break; |
| 1955 | } |
| 1956 | } |
| 1957 | /* |
| 1958 | * Check for Unexpected next to send (Ns) |
| 1959 | */ |
| 1960 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) |
| 1961 | { |
| 1962 | /* Unexpected next to send, with final bit cleared */ |
| 1963 | if (!info->pf) { |
| 1964 | irlap_update_nr_received(self, info->nr); |
| 1965 | |
| 1966 | irlap_start_wd_timer(self, self->wd_timeout); |
| 1967 | } else { |
| 1968 | /* Update Nr received */ |
| 1969 | irlap_update_nr_received(self, info->nr); |
| 1970 | |
| 1971 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 1972 | irlap_send_rr_frame(self, RSP_FRAME); |
| 1973 | |
| 1974 | irlap_start_wd_timer(self, self->wd_timeout); |
| 1975 | } |
| 1976 | break; |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * Unexpected Next to Receive(NR) ? |
| 1981 | */ |
| 1982 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) |
| 1983 | { |
| 1984 | if (info->pf) { |
| 1985 | IRDA_DEBUG(4, "RECV_I_RSP: frame(s) lost\n"); |
| 1986 | |
| 1987 | self->vr = (self->vr + 1) % 8; |
| 1988 | |
| 1989 | /* Update Nr received */ |
| 1990 | irlap_update_nr_received(self, info->nr); |
| 1991 | |
| 1992 | /* Resend rejected frames */ |
| 1993 | irlap_resend_rejected_frames(self, RSP_FRAME); |
| 1994 | |
| 1995 | /* Keep state, do not move this line */ |
| 1996 | irlap_next_state(self, LAP_NRM_S); |
| 1997 | |
| 1998 | irlap_data_indication(self, skb, FALSE); |
| 1999 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2000 | break; |
| 2001 | } |
| 2002 | /* |
| 2003 | * This is not documented in IrLAP!! Unexpected NR |
| 2004 | * with poll bit cleared |
| 2005 | */ |
| 2006 | if (!info->pf) { |
| 2007 | self->vr = (self->vr + 1) % 8; |
| 2008 | |
| 2009 | /* Update Nr received */ |
| 2010 | irlap_update_nr_received(self, info->nr); |
| 2011 | |
| 2012 | /* Keep state, do not move this line */ |
| 2013 | irlap_next_state(self, LAP_NRM_S); |
| 2014 | |
| 2015 | irlap_data_indication(self, skb, FALSE); |
| 2016 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2017 | } |
| 2018 | break; |
| 2019 | } |
| 2020 | |
| 2021 | if (ret == NR_INVALID) { |
| 2022 | IRDA_DEBUG(0, "NRM_S, NR_INVALID not implemented!\n"); |
| 2023 | } |
| 2024 | if (ret == NS_INVALID) { |
| 2025 | IRDA_DEBUG(0, "NRM_S, NS_INVALID not implemented!\n"); |
| 2026 | } |
| 2027 | break; |
| 2028 | case RECV_UI_FRAME: |
| 2029 | /* |
| 2030 | * poll bit cleared? |
| 2031 | */ |
| 2032 | if (!info->pf) { |
| 2033 | irlap_data_indication(self, skb, TRUE); |
| 2034 | irlap_next_state(self, LAP_NRM_S); /* Keep state */ |
| 2035 | } else { |
| 2036 | /* |
| 2037 | * Any pending data requests? |
| 2038 | */ |
| 2039 | if (!skb_queue_empty(&self->txq) && |
| 2040 | (self->window > 0) && !self->remote_busy) |
| 2041 | { |
| 2042 | irlap_data_indication(self, skb, TRUE); |
| 2043 | |
| 2044 | del_timer(&self->wd_timer); |
| 2045 | |
| 2046 | irlap_next_state(self, LAP_XMIT_S); |
| 2047 | } else { |
| 2048 | irlap_data_indication(self, skb, TRUE); |
| 2049 | |
| 2050 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2051 | |
| 2052 | irlap_send_rr_frame(self, RSP_FRAME); |
| 2053 | self->ack_required = FALSE; |
| 2054 | |
| 2055 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2056 | |
| 2057 | /* Keep the state */ |
| 2058 | irlap_next_state(self, LAP_NRM_S); |
| 2059 | } |
| 2060 | } |
| 2061 | break; |
| 2062 | case RECV_RR_CMD: |
| 2063 | self->retry_count = 0; |
| 2064 | |
| 2065 | /* |
| 2066 | * Nr as expected? |
| 2067 | */ |
| 2068 | nr_status = irlap_validate_nr_received(self, info->nr); |
| 2069 | if (nr_status == NR_EXPECTED) { |
| 2070 | if (!skb_queue_empty(&self->txq) && |
| 2071 | (self->window > 0)) { |
| 2072 | self->remote_busy = FALSE; |
| 2073 | |
| 2074 | /* Update Nr received */ |
| 2075 | irlap_update_nr_received(self, info->nr); |
| 2076 | del_timer(&self->wd_timer); |
| 2077 | |
| 2078 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2079 | irlap_next_state(self, LAP_XMIT_S); |
| 2080 | } else { |
| 2081 | self->remote_busy = FALSE; |
| 2082 | /* Update Nr received */ |
| 2083 | irlap_update_nr_received(self, info->nr); |
| 2084 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2085 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2086 | |
| 2087 | /* Note : if the link is idle (this case), |
| 2088 | * we never go in XMIT_S, so we never get a |
| 2089 | * chance to process any DISCONNECT_REQUEST. |
| 2090 | * Do it now ! - Jean II */ |
| 2091 | if (self->disconnect_pending) { |
| 2092 | /* Disconnect */ |
| 2093 | irlap_send_rd_frame(self); |
| 2094 | irlap_flush_all_queues(self); |
| 2095 | |
| 2096 | irlap_next_state(self, LAP_SCLOSE); |
| 2097 | } else { |
| 2098 | /* Just send back pf bit */ |
| 2099 | irlap_send_rr_frame(self, RSP_FRAME); |
| 2100 | |
| 2101 | irlap_next_state(self, LAP_NRM_S); |
| 2102 | } |
| 2103 | } |
| 2104 | } else if (nr_status == NR_UNEXPECTED) { |
| 2105 | self->remote_busy = FALSE; |
| 2106 | irlap_update_nr_received(self, info->nr); |
| 2107 | irlap_resend_rejected_frames(self, RSP_FRAME); |
| 2108 | |
| 2109 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2110 | |
| 2111 | /* Keep state */ |
| 2112 | irlap_next_state(self, LAP_NRM_S); |
| 2113 | } else { |
| 2114 | IRDA_DEBUG(1, "%s(), invalid nr not implemented!\n", |
| 2115 | __func__); |
| 2116 | } |
| 2117 | break; |
| 2118 | case RECV_SNRM_CMD: |
| 2119 | /* SNRM frame is not allowed to contain an I-field */ |
| 2120 | if (!info) { |
| 2121 | del_timer(&self->wd_timer); |
| 2122 | IRDA_DEBUG(1, "%s(), received SNRM cmd\n", __func__); |
| 2123 | irlap_next_state(self, LAP_RESET_CHECK); |
| 2124 | |
| 2125 | irlap_reset_indication(self); |
| 2126 | } else { |
| 2127 | IRDA_DEBUG(0, |
| 2128 | "%s(), SNRM frame contained an I-field!\n", |
| 2129 | __func__); |
| 2130 | |
| 2131 | } |
| 2132 | break; |
| 2133 | case RECV_REJ_CMD: |
| 2134 | irlap_update_nr_received(self, info->nr); |
| 2135 | if (self->remote_busy) { |
| 2136 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2137 | irlap_send_rr_frame(self, RSP_FRAME); |
| 2138 | } else |
| 2139 | irlap_resend_rejected_frames(self, RSP_FRAME); |
| 2140 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2141 | break; |
| 2142 | case RECV_SREJ_CMD: |
| 2143 | irlap_update_nr_received(self, info->nr); |
| 2144 | if (self->remote_busy) { |
| 2145 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2146 | irlap_send_rr_frame(self, RSP_FRAME); |
| 2147 | } else |
| 2148 | irlap_resend_rejected_frame(self, RSP_FRAME); |
| 2149 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2150 | break; |
| 2151 | case WD_TIMER_EXPIRED: |
| 2152 | /* |
| 2153 | * Wait until retry_count * n matches negotiated threshold/ |
| 2154 | * disconnect time (note 2 in IrLAP p. 82) |
| 2155 | * |
| 2156 | * Similar to irlap_state_nrm_p() -> FINAL_TIMER_EXPIRED |
| 2157 | * Note : self->wd_timeout = (self->final_timeout * 2), |
| 2158 | * which explain why we use (self->N2 / 2) here !!! |
| 2159 | * Jean II |
| 2160 | */ |
| 2161 | IRDA_DEBUG(1, "%s(), retry_count = %d\n", __func__, |
| 2162 | self->retry_count); |
| 2163 | |
| 2164 | if (self->retry_count < (self->N2 / 2)) { |
| 2165 | /* No retry, just wait for primary */ |
| 2166 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2167 | self->retry_count++; |
| 2168 | |
| 2169 | if((self->retry_count % (self->N1 / 2)) == 0) |
| 2170 | irlap_status_indication(self, |
| 2171 | STATUS_NO_ACTIVITY); |
| 2172 | } else { |
| 2173 | irlap_apply_default_connection_parameters(self); |
| 2174 | |
| 2175 | /* Always switch state before calling upper layers */ |
| 2176 | irlap_next_state(self, LAP_NDM); |
| 2177 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); |
| 2178 | } |
| 2179 | break; |
| 2180 | case RECV_DISC_CMD: |
| 2181 | /* Always switch state before calling upper layers */ |
| 2182 | irlap_next_state(self, LAP_NDM); |
| 2183 | |
| 2184 | /* Send disconnect response */ |
| 2185 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2186 | irlap_send_ua_response_frame(self, NULL); |
| 2187 | |
| 2188 | del_timer(&self->wd_timer); |
| 2189 | irlap_flush_all_queues(self); |
| 2190 | /* Set default link parameters */ |
| 2191 | irlap_apply_default_connection_parameters(self); |
| 2192 | |
| 2193 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 2194 | break; |
| 2195 | case RECV_DISCOVERY_XID_CMD: |
| 2196 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2197 | irlap_send_rr_frame(self, RSP_FRAME); |
| 2198 | self->ack_required = TRUE; |
| 2199 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2200 | irlap_next_state(self, LAP_NRM_S); |
| 2201 | |
| 2202 | break; |
| 2203 | case RECV_TEST_CMD: |
| 2204 | /* Remove test frame header (only LAP header in NRM) */ |
| 2205 | skb_pull(skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); |
| 2206 | |
| 2207 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2208 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2209 | |
| 2210 | /* Send response (info will be copied) */ |
| 2211 | irlap_send_test_frame(self, self->caddr, info->daddr, skb); |
| 2212 | break; |
| 2213 | default: |
| 2214 | IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __func__, |
| 2215 | event, irlap_event[event]); |
| 2216 | |
| 2217 | ret = -EINVAL; |
| 2218 | break; |
| 2219 | } |
| 2220 | return ret; |
| 2221 | } |
| 2222 | |
| 2223 | /* |
| 2224 | * Function irlap_state_sclose (self, event, skb, info) |
| 2225 | */ |
| 2226 | static int irlap_state_sclose(struct irlap_cb *self, IRLAP_EVENT event, |
| 2227 | struct sk_buff *skb, struct irlap_info *info) |
| 2228 | { |
| 2229 | int ret = 0; |
| 2230 | |
| 2231 | IRDA_DEBUG(1, "%s()\n", __func__); |
| 2232 | |
| 2233 | IRDA_ASSERT(self != NULL, return -ENODEV;); |
| 2234 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); |
| 2235 | |
| 2236 | switch (event) { |
| 2237 | case RECV_DISC_CMD: |
| 2238 | /* Always switch state before calling upper layers */ |
| 2239 | irlap_next_state(self, LAP_NDM); |
| 2240 | |
| 2241 | /* Send disconnect response */ |
| 2242 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2243 | irlap_send_ua_response_frame(self, NULL); |
| 2244 | |
| 2245 | del_timer(&self->wd_timer); |
| 2246 | /* Set default link parameters */ |
| 2247 | irlap_apply_default_connection_parameters(self); |
| 2248 | |
| 2249 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 2250 | break; |
| 2251 | case RECV_DM_RSP: |
| 2252 | /* IrLAP-1.1 p.82: in SCLOSE, S and I type RSP frames |
| 2253 | * shall take us down into default NDM state, like DM_RSP |
| 2254 | */ |
| 2255 | case RECV_RR_RSP: |
| 2256 | case RECV_RNR_RSP: |
| 2257 | case RECV_REJ_RSP: |
| 2258 | case RECV_SREJ_RSP: |
| 2259 | case RECV_I_RSP: |
| 2260 | /* Always switch state before calling upper layers */ |
| 2261 | irlap_next_state(self, LAP_NDM); |
| 2262 | |
| 2263 | del_timer(&self->wd_timer); |
| 2264 | irlap_apply_default_connection_parameters(self); |
| 2265 | |
| 2266 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 2267 | break; |
| 2268 | case WD_TIMER_EXPIRED: |
| 2269 | /* Always switch state before calling upper layers */ |
| 2270 | irlap_next_state(self, LAP_NDM); |
| 2271 | |
| 2272 | irlap_apply_default_connection_parameters(self); |
| 2273 | |
| 2274 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); |
| 2275 | break; |
| 2276 | default: |
| 2277 | /* IrLAP-1.1 p.82: in SCLOSE, basically any received frame |
| 2278 | * with pf=1 shall restart the wd-timer and resend the rd:rsp |
| 2279 | */ |
| 2280 | if (info != NULL && info->pf) { |
| 2281 | del_timer(&self->wd_timer); |
| 2282 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2283 | irlap_send_rd_frame(self); |
| 2284 | irlap_start_wd_timer(self, self->wd_timeout); |
| 2285 | break; /* stay in SCLOSE */ |
| 2286 | } |
| 2287 | |
| 2288 | IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __func__, |
| 2289 | event, irlap_event[event]); |
| 2290 | |
| 2291 | ret = -EINVAL; |
| 2292 | break; |
| 2293 | } |
| 2294 | |
| 2295 | return -1; |
| 2296 | } |
| 2297 | |
| 2298 | static int irlap_state_reset_check( struct irlap_cb *self, IRLAP_EVENT event, |
| 2299 | struct sk_buff *skb, |
| 2300 | struct irlap_info *info) |
| 2301 | { |
| 2302 | int ret = 0; |
| 2303 | |
| 2304 | IRDA_DEBUG(1, "%s(), event=%s\n", __func__, irlap_event[event]); |
| 2305 | |
| 2306 | IRDA_ASSERT(self != NULL, return -ENODEV;); |
| 2307 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); |
| 2308 | |
| 2309 | switch (event) { |
| 2310 | case RESET_RESPONSE: |
| 2311 | irlap_send_ua_response_frame(self, &self->qos_rx); |
| 2312 | irlap_initiate_connection_state(self); |
| 2313 | irlap_start_wd_timer(self, WD_TIMEOUT); |
| 2314 | irlap_flush_all_queues(self); |
| 2315 | |
| 2316 | irlap_next_state(self, LAP_NRM_S); |
| 2317 | break; |
| 2318 | case DISCONNECT_REQUEST: |
| 2319 | irlap_wait_min_turn_around(self, &self->qos_tx); |
| 2320 | irlap_send_rd_frame(self); |
| 2321 | irlap_start_wd_timer(self, WD_TIMEOUT); |
| 2322 | irlap_next_state(self, LAP_SCLOSE); |
| 2323 | break; |
| 2324 | default: |
| 2325 | IRDA_DEBUG(1, "%s(), Unknown event %d, (%s)\n", __func__, |
| 2326 | event, irlap_event[event]); |
| 2327 | |
| 2328 | ret = -EINVAL; |
| 2329 | break; |
| 2330 | } |
| 2331 | return ret; |
| 2332 | } |