Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: irlap.c |
| 4 | * Version: 1.0 |
| 5 | * Description: IrLAP implementation for Linux |
| 6 | * Status: Stable |
| 7 | * Author: Dag Brattli <dagb@cs.uit.no> |
| 8 | * Created at: Mon Aug 4 20:40:53 1997 |
| 9 | * Modified at: Tue Dec 14 09:26:44 1999 |
| 10 | * Modified by: Dag Brattli <dagb@cs.uit.no> |
| 11 | * |
| 12 | * Copyright (c) 1998-1999 Dag Brattli, All Rights Reserved. |
| 13 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or |
| 16 | * modify it under the terms of the GNU General Public License as |
| 17 | * published by the Free Software Foundation; either version 2 of |
| 18 | * the License, or (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
Jeff Kirsher | d377050 | 2013-12-06 09:13:43 -0800 | [diff] [blame] | 26 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | * |
| 28 | ********************************************************************/ |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/slab.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/proc_fs.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/random.h> |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/seq_file.h> |
| 39 | |
| 40 | #include <net/irda/irda.h> |
| 41 | #include <net/irda/irda_device.h> |
| 42 | #include <net/irda/irqueue.h> |
| 43 | #include <net/irda/irlmp.h> |
| 44 | #include <net/irda/irlmp_frame.h> |
| 45 | #include <net/irda/irlap_frame.h> |
| 46 | #include <net/irda/irlap.h> |
| 47 | #include <net/irda/timer.h> |
| 48 | #include <net/irda/qos.h> |
| 49 | |
| 50 | static hashbin_t *irlap = NULL; |
| 51 | int sysctl_slot_timeout = SLOT_TIMEOUT * 1000 / HZ; |
| 52 | |
| 53 | /* This is the delay of missed pf period before generating an event |
| 54 | * to the application. The spec mandate 3 seconds, but in some cases |
| 55 | * it's way too long. - Jean II */ |
| 56 | int sysctl_warn_noreply_time = 3; |
| 57 | |
| 58 | extern void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb); |
| 59 | static void __irlap_close(struct irlap_cb *self); |
| 60 | static void irlap_init_qos_capabilities(struct irlap_cb *self, |
| 61 | struct qos_info *qos_user); |
| 62 | |
| 63 | #ifdef CONFIG_IRDA_DEBUG |
Jan Engelhardt | 36cbd3d | 2009-08-05 10:42:58 -0700 | [diff] [blame] | 64 | static const char *const lap_reasons[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | "ERROR, NOT USED", |
| 66 | "LAP_DISC_INDICATION", |
| 67 | "LAP_NO_RESPONSE", |
| 68 | "LAP_RESET_INDICATION", |
| 69 | "LAP_FOUND_NONE", |
| 70 | "LAP_MEDIA_BUSY", |
| 71 | "LAP_PRIMARY_CONFLICT", |
| 72 | "ERROR, NOT USED", |
| 73 | }; |
| 74 | #endif /* CONFIG_IRDA_DEBUG */ |
| 75 | |
| 76 | int __init irlap_init(void) |
| 77 | { |
| 78 | /* Check if the compiler did its job properly. |
| 79 | * May happen on some ARM configuration, check with Russell King. */ |
| 80 | IRDA_ASSERT(sizeof(struct xid_frame) == 14, ;); |
| 81 | IRDA_ASSERT(sizeof(struct test_frame) == 10, ;); |
| 82 | IRDA_ASSERT(sizeof(struct ua_frame) == 10, ;); |
| 83 | IRDA_ASSERT(sizeof(struct snrm_frame) == 11, ;); |
| 84 | |
| 85 | /* Allocate master array */ |
| 86 | irlap = hashbin_new(HB_LOCK); |
| 87 | if (irlap == NULL) { |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 88 | net_err_ratelimited("%s: can't allocate irlap hashbin!\n", |
| 89 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | return -ENOMEM; |
| 91 | } |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
Samuel Ortiz | 75a69ac | 2007-07-18 02:16:30 -0700 | [diff] [blame] | 96 | void irlap_cleanup(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
| 98 | IRDA_ASSERT(irlap != NULL, return;); |
| 99 | |
| 100 | hashbin_delete(irlap, (FREE_FUNC) __irlap_close); |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Function irlap_open (driver) |
| 105 | * |
| 106 | * Initialize IrLAP layer |
| 107 | * |
| 108 | */ |
| 109 | struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos, |
| 110 | const char *hw_name) |
| 111 | { |
| 112 | struct irlap_cb *self; |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | /* Initialize the irlap structure. */ |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 115 | self = kzalloc(sizeof(struct irlap_cb), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | if (self == NULL) |
| 117 | return NULL; |
| 118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | self->magic = LAP_MAGIC; |
| 120 | |
| 121 | /* Make a binding between the layers */ |
| 122 | self->netdev = dev; |
| 123 | self->qos_dev = qos; |
| 124 | /* Copy hardware name */ |
| 125 | if(hw_name != NULL) { |
| 126 | strlcpy(self->hw_name, hw_name, sizeof(self->hw_name)); |
| 127 | } else { |
| 128 | self->hw_name[0] = '\0'; |
| 129 | } |
| 130 | |
| 131 | /* FIXME: should we get our own field? */ |
| 132 | dev->atalk_ptr = self; |
| 133 | |
| 134 | self->state = LAP_OFFLINE; |
| 135 | |
| 136 | /* Initialize transmit queue */ |
| 137 | skb_queue_head_init(&self->txq); |
| 138 | skb_queue_head_init(&self->txq_ultra); |
| 139 | skb_queue_head_init(&self->wx_list); |
| 140 | |
| 141 | /* My unique IrLAP device address! */ |
| 142 | /* We don't want the broadcast address, neither the NULL address |
| 143 | * (most often used to signify "invalid"), and we don't want an |
| 144 | * address already in use (otherwise connect won't be able |
| 145 | * to select the proper link). - Jean II */ |
| 146 | do { |
| 147 | get_random_bytes(&self->saddr, sizeof(self->saddr)); |
| 148 | } while ((self->saddr == 0x0) || (self->saddr == BROADCAST) || |
| 149 | (hashbin_lock_find(irlap, self->saddr, NULL)) ); |
| 150 | /* Copy to the driver */ |
| 151 | memcpy(dev->dev_addr, &self->saddr, 4); |
| 152 | |
| 153 | init_timer(&self->slot_timer); |
| 154 | init_timer(&self->query_timer); |
| 155 | init_timer(&self->discovery_timer); |
| 156 | init_timer(&self->final_timer); |
| 157 | init_timer(&self->poll_timer); |
| 158 | init_timer(&self->wd_timer); |
| 159 | init_timer(&self->backoff_timer); |
| 160 | init_timer(&self->media_busy_timer); |
| 161 | |
| 162 | irlap_apply_default_connection_parameters(self); |
| 163 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 164 | self->N3 = 3; /* # connections attempts to try before giving up */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
| 166 | self->state = LAP_NDM; |
| 167 | |
| 168 | hashbin_insert(irlap, (irda_queue_t *) self, self->saddr, NULL); |
| 169 | |
| 170 | irlmp_register_link(self, self->saddr, &self->notify); |
| 171 | |
| 172 | return self; |
| 173 | } |
| 174 | EXPORT_SYMBOL(irlap_open); |
| 175 | |
| 176 | /* |
| 177 | * Function __irlap_close (self) |
| 178 | * |
| 179 | * Remove IrLAP and all allocated memory. Stop any pending timers. |
| 180 | * |
| 181 | */ |
| 182 | static void __irlap_close(struct irlap_cb *self) |
| 183 | { |
| 184 | IRDA_ASSERT(self != NULL, return;); |
| 185 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 186 | |
| 187 | /* Stop timers */ |
| 188 | del_timer(&self->slot_timer); |
| 189 | del_timer(&self->query_timer); |
| 190 | del_timer(&self->discovery_timer); |
| 191 | del_timer(&self->final_timer); |
| 192 | del_timer(&self->poll_timer); |
| 193 | del_timer(&self->wd_timer); |
| 194 | del_timer(&self->backoff_timer); |
| 195 | del_timer(&self->media_busy_timer); |
| 196 | |
| 197 | irlap_flush_all_queues(self); |
| 198 | |
| 199 | self->magic = 0; |
| 200 | |
| 201 | kfree(self); |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Function irlap_close (self) |
| 206 | * |
| 207 | * Remove IrLAP instance |
| 208 | * |
| 209 | */ |
| 210 | void irlap_close(struct irlap_cb *self) |
| 211 | { |
| 212 | struct irlap_cb *lap; |
| 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | IRDA_ASSERT(self != NULL, return;); |
| 215 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 216 | |
| 217 | /* We used to send a LAP_DISC_INDICATION here, but this was |
| 218 | * racy. This has been move within irlmp_unregister_link() |
| 219 | * itself. Jean II */ |
| 220 | |
| 221 | /* Kill the LAP and all LSAPs on top of it */ |
| 222 | irlmp_unregister_link(self->saddr); |
| 223 | self->notify.instance = NULL; |
| 224 | |
| 225 | /* Be sure that we manage to remove ourself from the hash */ |
| 226 | lap = hashbin_remove(irlap, self->saddr, NULL); |
| 227 | if (!lap) { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 228 | pr_debug("%s(), Didn't find myself!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | return; |
| 230 | } |
| 231 | __irlap_close(lap); |
| 232 | } |
| 233 | EXPORT_SYMBOL(irlap_close); |
| 234 | |
| 235 | /* |
| 236 | * Function irlap_connect_indication (self, skb) |
| 237 | * |
| 238 | * Another device is attempting to make a connection |
| 239 | * |
| 240 | */ |
| 241 | void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb) |
| 242 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | IRDA_ASSERT(self != NULL, return;); |
| 244 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 245 | |
| 246 | irlap_init_qos_capabilities(self, NULL); /* No user QoS! */ |
| 247 | |
| 248 | irlmp_link_connect_indication(self->notify.instance, self->saddr, |
| 249 | self->daddr, &self->qos_tx, skb); |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Function irlap_connect_response (self, skb) |
| 254 | * |
| 255 | * Service user has accepted incoming connection |
| 256 | * |
| 257 | */ |
| 258 | void irlap_connect_response(struct irlap_cb *self, struct sk_buff *userdata) |
| 259 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | irlap_do_event(self, CONNECT_RESPONSE, userdata, NULL); |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Function irlap_connect_request (self, daddr, qos_user, sniff) |
| 265 | * |
| 266 | * Request connection with another device, sniffing is not implemented |
| 267 | * yet. |
| 268 | * |
| 269 | */ |
| 270 | void irlap_connect_request(struct irlap_cb *self, __u32 daddr, |
| 271 | struct qos_info *qos_user, int sniff) |
| 272 | { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 273 | pr_debug("%s(), daddr=0x%08x\n", __func__, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | IRDA_ASSERT(self != NULL, return;); |
| 276 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 277 | |
| 278 | self->daddr = daddr; |
| 279 | |
| 280 | /* |
| 281 | * If the service user specifies QoS values for this connection, |
| 282 | * then use them |
| 283 | */ |
| 284 | irlap_init_qos_capabilities(self, qos_user); |
| 285 | |
| 286 | if ((self->state == LAP_NDM) && !self->media_busy) |
| 287 | irlap_do_event(self, CONNECT_REQUEST, NULL, NULL); |
| 288 | else |
| 289 | self->connect_pending = TRUE; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Function irlap_connect_confirm (self, skb) |
| 294 | * |
| 295 | * Connection request has been accepted |
| 296 | * |
| 297 | */ |
| 298 | void irlap_connect_confirm(struct irlap_cb *self, struct sk_buff *skb) |
| 299 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | IRDA_ASSERT(self != NULL, return;); |
| 301 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 302 | |
| 303 | irlmp_link_connect_confirm(self->notify.instance, &self->qos_tx, skb); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Function irlap_data_indication (self, skb) |
| 308 | * |
| 309 | * Received data frames from IR-port, so we just pass them up to |
| 310 | * IrLMP for further processing |
| 311 | * |
| 312 | */ |
| 313 | void irlap_data_indication(struct irlap_cb *self, struct sk_buff *skb, |
| 314 | int unreliable) |
| 315 | { |
| 316 | /* Hide LAP header from IrLMP layer */ |
| 317 | skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER); |
| 318 | |
| 319 | irlmp_link_data_indication(self->notify.instance, skb, unreliable); |
| 320 | } |
| 321 | |
| 322 | |
| 323 | /* |
| 324 | * Function irlap_data_request (self, skb) |
| 325 | * |
| 326 | * Queue data for transmission, must wait until XMIT state |
| 327 | * |
| 328 | */ |
| 329 | void irlap_data_request(struct irlap_cb *self, struct sk_buff *skb, |
| 330 | int unreliable) |
| 331 | { |
| 332 | IRDA_ASSERT(self != NULL, return;); |
| 333 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER), |
| 336 | return;); |
| 337 | skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER); |
| 338 | |
| 339 | /* |
| 340 | * Must set frame format now so that the rest of the code knows |
| 341 | * if its dealing with an I or an UI frame |
| 342 | */ |
| 343 | if (unreliable) |
| 344 | skb->data[1] = UI_FRAME; |
| 345 | else |
| 346 | skb->data[1] = I_FRAME; |
| 347 | |
| 348 | /* Don't forget to refcount it - see irlmp_connect_request(). */ |
| 349 | skb_get(skb); |
| 350 | |
| 351 | /* Add at the end of the queue (keep ordering) - Jean II */ |
| 352 | skb_queue_tail(&self->txq, skb); |
| 353 | |
| 354 | /* |
| 355 | * Send event if this frame only if we are in the right state |
| 356 | * FIXME: udata should be sent first! (skb_queue_head?) |
| 357 | */ |
| 358 | if ((self->state == LAP_XMIT_P) || (self->state == LAP_XMIT_S)) { |
| 359 | /* If we are not already processing the Tx queue, trigger |
| 360 | * transmission immediately - Jean II */ |
| 361 | if((skb_queue_len(&self->txq) <= 1) && (!self->local_busy)) |
| 362 | irlap_do_event(self, DATA_REQUEST, skb, NULL); |
| 363 | /* Otherwise, the packets will be sent normally at the |
| 364 | * next pf-poll - Jean II */ |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Function irlap_unitdata_request (self, skb) |
| 370 | * |
| 371 | * Send Ultra data. This is data that must be sent outside any connection |
| 372 | * |
| 373 | */ |
| 374 | #ifdef CONFIG_IRDA_ULTRA |
| 375 | void irlap_unitdata_request(struct irlap_cb *self, struct sk_buff *skb) |
| 376 | { |
| 377 | IRDA_ASSERT(self != NULL, return;); |
| 378 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | IRDA_ASSERT(skb_headroom(skb) >= (LAP_ADDR_HEADER+LAP_CTRL_HEADER), |
| 381 | return;); |
| 382 | skb_push(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER); |
| 383 | |
| 384 | skb->data[0] = CBROADCAST; |
| 385 | skb->data[1] = UI_FRAME; |
| 386 | |
| 387 | /* Don't need to refcount, see irlmp_connless_data_request() */ |
| 388 | |
| 389 | skb_queue_tail(&self->txq_ultra, skb); |
| 390 | |
| 391 | irlap_do_event(self, SEND_UI_FRAME, NULL, NULL); |
| 392 | } |
| 393 | #endif /*CONFIG_IRDA_ULTRA */ |
| 394 | |
| 395 | /* |
| 396 | * Function irlap_udata_indication (self, skb) |
| 397 | * |
| 398 | * Receive Ultra data. This is data that is received outside any connection |
| 399 | * |
| 400 | */ |
| 401 | #ifdef CONFIG_IRDA_ULTRA |
| 402 | void irlap_unitdata_indication(struct irlap_cb *self, struct sk_buff *skb) |
| 403 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | IRDA_ASSERT(self != NULL, return;); |
| 405 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 406 | IRDA_ASSERT(skb != NULL, return;); |
| 407 | |
| 408 | /* Hide LAP header from IrLMP layer */ |
| 409 | skb_pull(skb, LAP_ADDR_HEADER+LAP_CTRL_HEADER); |
| 410 | |
| 411 | irlmp_link_unitdata_indication(self->notify.instance, skb); |
| 412 | } |
| 413 | #endif /* CONFIG_IRDA_ULTRA */ |
| 414 | |
| 415 | /* |
| 416 | * Function irlap_disconnect_request (void) |
| 417 | * |
| 418 | * Request to disconnect connection by service user |
| 419 | */ |
| 420 | void irlap_disconnect_request(struct irlap_cb *self) |
| 421 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | IRDA_ASSERT(self != NULL, return;); |
| 423 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 424 | |
| 425 | /* Don't disconnect until all data frames are successfully sent */ |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 426 | if (!skb_queue_empty(&self->txq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | self->disconnect_pending = TRUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | return; |
| 429 | } |
| 430 | |
| 431 | /* Check if we are in the right state for disconnecting */ |
| 432 | switch (self->state) { |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 433 | case LAP_XMIT_P: /* FALLTHROUGH */ |
| 434 | case LAP_XMIT_S: /* FALLTHROUGH */ |
| 435 | case LAP_CONN: /* FALLTHROUGH */ |
| 436 | case LAP_RESET_WAIT: /* FALLTHROUGH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | case LAP_RESET_CHECK: |
| 438 | irlap_do_event(self, DISCONNECT_REQUEST, NULL, NULL); |
| 439 | break; |
| 440 | default: |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 441 | pr_debug("%s(), disconnect pending!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | self->disconnect_pending = TRUE; |
| 443 | break; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Function irlap_disconnect_indication (void) |
| 449 | * |
| 450 | * Disconnect request from other device |
| 451 | * |
| 452 | */ |
| 453 | void irlap_disconnect_indication(struct irlap_cb *self, LAP_REASON reason) |
| 454 | { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 455 | pr_debug("%s(), reason=%s\n", __func__, lap_reasons[reason]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | IRDA_ASSERT(self != NULL, return;); |
| 458 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 459 | |
| 460 | /* Flush queues */ |
| 461 | irlap_flush_all_queues(self); |
| 462 | |
| 463 | switch (reason) { |
| 464 | case LAP_RESET_INDICATION: |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 465 | pr_debug("%s(), Sending reset request!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | irlap_do_event(self, RESET_REQUEST, NULL, NULL); |
| 467 | break; |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 468 | case LAP_NO_RESPONSE: /* FALLTHROUGH */ |
| 469 | case LAP_DISC_INDICATION: /* FALLTHROUGH */ |
| 470 | case LAP_FOUND_NONE: /* FALLTHROUGH */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | case LAP_MEDIA_BUSY: |
| 472 | irlmp_link_disconnect_indication(self->notify.instance, self, |
| 473 | reason, NULL); |
| 474 | break; |
| 475 | default: |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 476 | net_err_ratelimited("%s: Unknown reason %d\n", |
| 477 | __func__, reason); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | } |
| 480 | |
| 481 | /* |
| 482 | * Function irlap_discovery_request (gen_addr_bit) |
| 483 | * |
| 484 | * Start one single discovery operation. |
| 485 | * |
| 486 | */ |
| 487 | void irlap_discovery_request(struct irlap_cb *self, discovery_t *discovery) |
| 488 | { |
| 489 | struct irlap_info info; |
| 490 | |
| 491 | IRDA_ASSERT(self != NULL, return;); |
| 492 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 493 | IRDA_ASSERT(discovery != NULL, return;); |
| 494 | |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 495 | pr_debug("%s(), nslots = %d\n", __func__, discovery->nslots); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
| 497 | IRDA_ASSERT((discovery->nslots == 1) || (discovery->nslots == 6) || |
| 498 | (discovery->nslots == 8) || (discovery->nslots == 16), |
| 499 | return;); |
| 500 | |
| 501 | /* Discovery is only possible in NDM mode */ |
| 502 | if (self->state != LAP_NDM) { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 503 | pr_debug("%s(), discovery only possible in NDM mode\n", |
| 504 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | irlap_discovery_confirm(self, NULL); |
| 506 | /* Note : in theory, if we are not in NDM, we could postpone |
| 507 | * the discovery like we do for connection request. |
| 508 | * In practice, it's not worth it. If the media was busy, |
| 509 | * it's likely next time around it won't be busy. If we are |
| 510 | * in REPLY state, we will get passive discovery info & event. |
| 511 | * Jean II */ |
| 512 | return; |
| 513 | } |
| 514 | |
| 515 | /* Check if last discovery request finished in time, or if |
| 516 | * it was aborted due to the media busy flag. */ |
| 517 | if (self->discovery_log != NULL) { |
| 518 | hashbin_delete(self->discovery_log, (FREE_FUNC) kfree); |
| 519 | self->discovery_log = NULL; |
| 520 | } |
| 521 | |
| 522 | /* All operations will occur at predictable time, no need to lock */ |
| 523 | self->discovery_log = hashbin_new(HB_NOLOCK); |
| 524 | |
| 525 | if (self->discovery_log == NULL) { |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 526 | net_warn_ratelimited("%s(), Unable to allocate discovery log!\n", |
| 527 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | return; |
| 529 | } |
| 530 | |
| 531 | info.S = discovery->nslots; /* Number of slots */ |
| 532 | info.s = 0; /* Current slot */ |
| 533 | |
| 534 | self->discovery_cmd = discovery; |
| 535 | info.discovery = discovery; |
| 536 | |
| 537 | /* sysctl_slot_timeout bounds are checked in irsysctl.c - Jean II */ |
| 538 | self->slot_timeout = sysctl_slot_timeout * HZ / 1000; |
| 539 | |
| 540 | irlap_do_event(self, DISCOVERY_REQUEST, NULL, &info); |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * Function irlap_discovery_confirm (log) |
| 545 | * |
| 546 | * A device has been discovered in front of this station, we |
| 547 | * report directly to LMP. |
| 548 | */ |
| 549 | void irlap_discovery_confirm(struct irlap_cb *self, hashbin_t *discovery_log) |
| 550 | { |
| 551 | IRDA_ASSERT(self != NULL, return;); |
| 552 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 553 | |
| 554 | IRDA_ASSERT(self->notify.instance != NULL, return;); |
| 555 | |
| 556 | /* |
| 557 | * Check for successful discovery, since we are then allowed to clear |
| 558 | * the media busy condition (IrLAP 6.13.4 - p.94). This should allow |
| 559 | * us to make connection attempts much faster and easier (i.e. no |
| 560 | * collisions). |
| 561 | * Setting media busy to false will also generate an event allowing |
| 562 | * to process pending events in NDM state machine. |
| 563 | * Note : the spec doesn't define what's a successful discovery is. |
| 564 | * If we want Ultra to work, it's successful even if there is |
| 565 | * nobody discovered - Jean II |
| 566 | */ |
| 567 | if (discovery_log) |
| 568 | irda_device_set_media_busy(self->netdev, FALSE); |
| 569 | |
| 570 | /* Inform IrLMP */ |
| 571 | irlmp_link_discovery_confirm(self->notify.instance, discovery_log); |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Function irlap_discovery_indication (log) |
| 576 | * |
| 577 | * Somebody is trying to discover us! |
| 578 | * |
| 579 | */ |
| 580 | void irlap_discovery_indication(struct irlap_cb *self, discovery_t *discovery) |
| 581 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | IRDA_ASSERT(self != NULL, return;); |
| 583 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 584 | IRDA_ASSERT(discovery != NULL, return;); |
| 585 | |
| 586 | IRDA_ASSERT(self->notify.instance != NULL, return;); |
| 587 | |
| 588 | /* A device is very likely to connect immediately after it performs |
| 589 | * a successful discovery. This means that in our case, we are much |
| 590 | * more likely to receive a connection request over the medium. |
| 591 | * So, we backoff to avoid collisions. |
| 592 | * IrLAP spec 6.13.4 suggest 100ms... |
| 593 | * Note : this little trick actually make a *BIG* difference. If I set |
| 594 | * my Linux box with discovery enabled and one Ultra frame sent every |
| 595 | * second, my Palm has no trouble connecting to it every time ! |
| 596 | * Jean II */ |
| 597 | irda_device_set_media_busy(self->netdev, SMALL); |
| 598 | |
| 599 | irlmp_link_discovery_indication(self->notify.instance, discovery); |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Function irlap_status_indication (quality_of_link) |
| 604 | */ |
| 605 | void irlap_status_indication(struct irlap_cb *self, int quality_of_link) |
| 606 | { |
| 607 | switch (quality_of_link) { |
| 608 | case STATUS_NO_ACTIVITY: |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 609 | net_info_ratelimited("IrLAP, no activity on link!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | break; |
| 611 | case STATUS_NOISY: |
Joe Perches | 6c91023 | 2014-11-11 13:37:30 -0800 | [diff] [blame] | 612 | net_info_ratelimited("IrLAP, noisy link!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | break; |
| 614 | default: |
| 615 | break; |
| 616 | } |
| 617 | irlmp_status_indication(self->notify.instance, |
| 618 | quality_of_link, LOCK_NO_CHANGE); |
| 619 | } |
| 620 | |
| 621 | /* |
| 622 | * Function irlap_reset_indication (void) |
| 623 | */ |
| 624 | void irlap_reset_indication(struct irlap_cb *self) |
| 625 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | IRDA_ASSERT(self != NULL, return;); |
| 627 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 628 | |
| 629 | if (self->state == LAP_RESET_WAIT) |
| 630 | irlap_do_event(self, RESET_REQUEST, NULL, NULL); |
| 631 | else |
| 632 | irlap_do_event(self, RESET_RESPONSE, NULL, NULL); |
| 633 | } |
| 634 | |
| 635 | /* |
| 636 | * Function irlap_reset_confirm (void) |
| 637 | */ |
| 638 | void irlap_reset_confirm(void) |
| 639 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Function irlap_generate_rand_time_slot (S, s) |
| 644 | * |
| 645 | * Generate a random time slot between s and S-1 where |
| 646 | * S = Number of slots (0 -> S-1) |
| 647 | * s = Current slot |
| 648 | */ |
| 649 | int irlap_generate_rand_time_slot(int S, int s) |
| 650 | { |
| 651 | static int rand; |
| 652 | int slot; |
| 653 | |
| 654 | IRDA_ASSERT((S - s) > 0, return 0;); |
| 655 | |
| 656 | rand += jiffies; |
| 657 | rand ^= (rand << 12); |
| 658 | rand ^= (rand >> 20); |
| 659 | |
| 660 | slot = s + rand % (S-s); |
| 661 | |
| 662 | IRDA_ASSERT((slot >= s) || (slot < S), return 0;); |
| 663 | |
| 664 | return slot; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Function irlap_update_nr_received (nr) |
| 669 | * |
| 670 | * Remove all acknowledged frames in current window queue. This code is |
| 671 | * not intuitive and you should not try to change it. If you think it |
| 672 | * contains bugs, please mail a patch to the author instead. |
| 673 | */ |
| 674 | void irlap_update_nr_received(struct irlap_cb *self, int nr) |
| 675 | { |
| 676 | struct sk_buff *skb = NULL; |
| 677 | int count = 0; |
| 678 | |
| 679 | /* |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 680 | * Remove all the ack-ed frames from the window queue. |
| 681 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | /* |
| 684 | * Optimize for the common case. It is most likely that the receiver |
| 685 | * will acknowledge all the frames we have sent! So in that case we |
| 686 | * delete all frames stored in window. |
| 687 | */ |
| 688 | if (nr == self->vs) { |
| 689 | while ((skb = skb_dequeue(&self->wx_list)) != NULL) { |
| 690 | dev_kfree_skb(skb); |
| 691 | } |
| 692 | /* The last acked frame is the next to send minus one */ |
| 693 | self->va = nr - 1; |
| 694 | } else { |
| 695 | /* Remove all acknowledged frames in current window */ |
| 696 | while ((skb_peek(&self->wx_list) != NULL) && |
| 697 | (((self->va+1) % 8) != nr)) |
| 698 | { |
| 699 | skb = skb_dequeue(&self->wx_list); |
| 700 | dev_kfree_skb(skb); |
| 701 | |
| 702 | self->va = (self->va + 1) % 8; |
| 703 | count++; |
| 704 | } |
| 705 | } |
| 706 | |
| 707 | /* Advance window */ |
| 708 | self->window = self->window_size - skb_queue_len(&self->wx_list); |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * Function irlap_validate_ns_received (ns) |
| 713 | * |
| 714 | * Validate the next to send (ns) field from received frame. |
| 715 | */ |
| 716 | int irlap_validate_ns_received(struct irlap_cb *self, int ns) |
| 717 | { |
| 718 | /* ns as expected? */ |
| 719 | if (ns == self->vr) |
| 720 | return NS_EXPECTED; |
| 721 | /* |
| 722 | * Stations are allowed to treat invalid NS as unexpected NS |
| 723 | * IrLAP, Recv ... with-invalid-Ns. p. 84 |
| 724 | */ |
| 725 | return NS_UNEXPECTED; |
| 726 | |
| 727 | /* return NR_INVALID; */ |
| 728 | } |
| 729 | /* |
| 730 | * Function irlap_validate_nr_received (nr) |
| 731 | * |
| 732 | * Validate the next to receive (nr) field from received frame. |
| 733 | * |
| 734 | */ |
| 735 | int irlap_validate_nr_received(struct irlap_cb *self, int nr) |
| 736 | { |
| 737 | /* nr as expected? */ |
| 738 | if (nr == self->vs) { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 739 | pr_debug("%s(), expected!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | return NR_EXPECTED; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * unexpected nr? (but within current window), first we check if the |
| 745 | * ns numbers of the frames in the current window wrap. |
| 746 | */ |
| 747 | if (self->va < self->vs) { |
| 748 | if ((nr >= self->va) && (nr <= self->vs)) |
| 749 | return NR_UNEXPECTED; |
| 750 | } else { |
| 751 | if ((nr >= self->va) || (nr <= self->vs)) |
| 752 | return NR_UNEXPECTED; |
| 753 | } |
| 754 | |
| 755 | /* Invalid nr! */ |
| 756 | return NR_INVALID; |
| 757 | } |
| 758 | |
| 759 | /* |
| 760 | * Function irlap_initiate_connection_state () |
| 761 | * |
| 762 | * Initialize the connection state parameters |
| 763 | * |
| 764 | */ |
| 765 | void irlap_initiate_connection_state(struct irlap_cb *self) |
| 766 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | IRDA_ASSERT(self != NULL, return;); |
| 768 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 769 | |
| 770 | /* Next to send and next to receive */ |
| 771 | self->vs = self->vr = 0; |
| 772 | |
| 773 | /* Last frame which got acked (0 - 1) % 8 */ |
| 774 | self->va = 7; |
| 775 | |
| 776 | self->window = 1; |
| 777 | |
| 778 | self->remote_busy = FALSE; |
| 779 | self->retry_count = 0; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * Function irlap_wait_min_turn_around (self, qos) |
| 784 | * |
| 785 | * Wait negotiated minimum turn around time, this function actually sets |
| 786 | * the number of BOS's that must be sent before the next transmitted |
| 787 | * frame in order to delay for the specified amount of time. This is |
| 788 | * done to avoid using timers, and the forbidden udelay! |
| 789 | */ |
| 790 | void irlap_wait_min_turn_around(struct irlap_cb *self, struct qos_info *qos) |
| 791 | { |
| 792 | __u32 min_turn_time; |
| 793 | __u32 speed; |
| 794 | |
| 795 | /* Get QoS values. */ |
| 796 | speed = qos->baud_rate.value; |
| 797 | min_turn_time = qos->min_turn_time.value; |
| 798 | |
| 799 | /* No need to calculate XBOFs for speeds over 115200 bps */ |
| 800 | if (speed > 115200) { |
| 801 | self->mtt_required = min_turn_time; |
| 802 | return; |
| 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Send additional BOF's for the next frame for the requested |
| 807 | * min turn time, so now we must calculate how many chars (XBOF's) we |
| 808 | * must send for the requested time period (min turn time) |
| 809 | */ |
| 810 | self->xbofs_delay = irlap_min_turn_time_in_bytes(speed, min_turn_time); |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * Function irlap_flush_all_queues (void) |
| 815 | * |
| 816 | * Flush all queues |
| 817 | * |
| 818 | */ |
| 819 | void irlap_flush_all_queues(struct irlap_cb *self) |
| 820 | { |
| 821 | struct sk_buff* skb; |
| 822 | |
| 823 | IRDA_ASSERT(self != NULL, return;); |
| 824 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 825 | |
| 826 | /* Free transmission queue */ |
| 827 | while ((skb = skb_dequeue(&self->txq)) != NULL) |
| 828 | dev_kfree_skb(skb); |
| 829 | |
| 830 | while ((skb = skb_dequeue(&self->txq_ultra)) != NULL) |
| 831 | dev_kfree_skb(skb); |
| 832 | |
| 833 | /* Free sliding window buffered packets */ |
| 834 | while ((skb = skb_dequeue(&self->wx_list)) != NULL) |
| 835 | dev_kfree_skb(skb); |
| 836 | } |
| 837 | |
| 838 | /* |
| 839 | * Function irlap_setspeed (self, speed) |
| 840 | * |
| 841 | * Change the speed of the IrDA port |
| 842 | * |
| 843 | */ |
| 844 | static void irlap_change_speed(struct irlap_cb *self, __u32 speed, int now) |
| 845 | { |
| 846 | struct sk_buff *skb; |
| 847 | |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 848 | pr_debug("%s(), setting speed to %d\n", __func__, speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | IRDA_ASSERT(self != NULL, return;); |
| 851 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 852 | |
| 853 | self->speed = speed; |
| 854 | |
| 855 | /* Change speed now, or just piggyback speed on frames */ |
| 856 | if (now) { |
| 857 | /* Send down empty frame to trigger speed change */ |
Samuel Ortiz | 485fb2c | 2006-07-21 14:50:41 -0700 | [diff] [blame] | 858 | skb = alloc_skb(0, GFP_ATOMIC); |
Florin Malita | 8c893ff | 2006-06-05 15:34:52 -0700 | [diff] [blame] | 859 | if (skb) |
| 860 | irlap_queue_xmit(self, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | } |
| 863 | |
| 864 | /* |
| 865 | * Function irlap_init_qos_capabilities (self, qos) |
| 866 | * |
| 867 | * Initialize QoS for this IrLAP session, What we do is to compute the |
| 868 | * intersection of the QoS capabilities for the user, driver and for |
| 869 | * IrLAP itself. Normally, IrLAP will not specify any values, but it can |
| 870 | * be used to restrict certain values. |
| 871 | */ |
| 872 | static void irlap_init_qos_capabilities(struct irlap_cb *self, |
| 873 | struct qos_info *qos_user) |
| 874 | { |
| 875 | IRDA_ASSERT(self != NULL, return;); |
| 876 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 877 | IRDA_ASSERT(self->netdev != NULL, return;); |
| 878 | |
| 879 | /* Start out with the maximum QoS support possible */ |
| 880 | irda_init_max_qos_capabilies(&self->qos_rx); |
| 881 | |
| 882 | /* Apply drivers QoS capabilities */ |
| 883 | irda_qos_compute_intersection(&self->qos_rx, self->qos_dev); |
| 884 | |
| 885 | /* |
| 886 | * Check for user supplied QoS parameters. The service user is only |
| 887 | * allowed to supply these values. We check each parameter since the |
| 888 | * user may not have set all of them. |
| 889 | */ |
| 890 | if (qos_user) { |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 891 | pr_debug("%s(), Found user specified QoS!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
| 893 | if (qos_user->baud_rate.bits) |
| 894 | self->qos_rx.baud_rate.bits &= qos_user->baud_rate.bits; |
| 895 | |
| 896 | if (qos_user->max_turn_time.bits) |
| 897 | self->qos_rx.max_turn_time.bits &= qos_user->max_turn_time.bits; |
| 898 | if (qos_user->data_size.bits) |
| 899 | self->qos_rx.data_size.bits &= qos_user->data_size.bits; |
| 900 | |
| 901 | if (qos_user->link_disc_time.bits) |
| 902 | self->qos_rx.link_disc_time.bits &= qos_user->link_disc_time.bits; |
| 903 | } |
| 904 | |
| 905 | /* Use 500ms in IrLAP for now */ |
| 906 | self->qos_rx.max_turn_time.bits &= 0x01; |
| 907 | |
| 908 | /* Set data size */ |
| 909 | /*self->qos_rx.data_size.bits &= 0x03;*/ |
| 910 | |
| 911 | irda_qos_bits_to_value(&self->qos_rx); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * Function irlap_apply_default_connection_parameters (void, now) |
| 916 | * |
| 917 | * Use the default connection and transmission parameters |
| 918 | */ |
| 919 | void irlap_apply_default_connection_parameters(struct irlap_cb *self) |
| 920 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | IRDA_ASSERT(self != NULL, return;); |
| 922 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 923 | |
| 924 | /* xbofs : Default value in NDM */ |
| 925 | self->next_bofs = 12; |
| 926 | self->bofs_count = 12; |
| 927 | |
| 928 | /* NDM Speed is 9600 */ |
| 929 | irlap_change_speed(self, 9600, TRUE); |
| 930 | |
| 931 | /* Set mbusy when going to NDM state */ |
| 932 | irda_device_set_media_busy(self->netdev, TRUE); |
| 933 | |
| 934 | /* |
| 935 | * Generate random connection address for this session, which must |
| 936 | * be 7 bits wide and different from 0x00 and 0xfe |
| 937 | */ |
| 938 | while ((self->caddr == 0x00) || (self->caddr == 0xfe)) { |
| 939 | get_random_bytes(&self->caddr, sizeof(self->caddr)); |
| 940 | self->caddr &= 0xfe; |
| 941 | } |
| 942 | |
| 943 | /* Use default values until connection has been negitiated */ |
| 944 | self->slot_timeout = sysctl_slot_timeout; |
| 945 | self->final_timeout = FINAL_TIMEOUT; |
| 946 | self->poll_timeout = POLL_TIMEOUT; |
| 947 | self->wd_timeout = WD_TIMEOUT; |
| 948 | |
| 949 | /* Set some default values */ |
| 950 | self->qos_tx.baud_rate.value = 9600; |
| 951 | self->qos_rx.baud_rate.value = 9600; |
| 952 | self->qos_tx.max_turn_time.value = 0; |
| 953 | self->qos_rx.max_turn_time.value = 0; |
| 954 | self->qos_tx.min_turn_time.value = 0; |
| 955 | self->qos_rx.min_turn_time.value = 0; |
| 956 | self->qos_tx.data_size.value = 64; |
| 957 | self->qos_rx.data_size.value = 64; |
| 958 | self->qos_tx.window_size.value = 1; |
| 959 | self->qos_rx.window_size.value = 1; |
| 960 | self->qos_tx.additional_bofs.value = 12; |
| 961 | self->qos_rx.additional_bofs.value = 12; |
| 962 | self->qos_tx.link_disc_time.value = 0; |
| 963 | self->qos_rx.link_disc_time.value = 0; |
| 964 | |
| 965 | irlap_flush_all_queues(self); |
| 966 | |
| 967 | self->disconnect_pending = FALSE; |
| 968 | self->connect_pending = FALSE; |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * Function irlap_apply_connection_parameters (qos, now) |
| 973 | * |
| 974 | * Initialize IrLAP with the negotiated QoS values |
| 975 | * |
| 976 | * If 'now' is false, the speed and xbofs will be changed after the next |
| 977 | * frame is sent. |
| 978 | * If 'now' is true, the speed and xbofs is changed immediately |
| 979 | */ |
| 980 | void irlap_apply_connection_parameters(struct irlap_cb *self, int now) |
| 981 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | IRDA_ASSERT(self != NULL, return;); |
| 983 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| 984 | |
| 985 | /* Set the negotiated xbofs value */ |
| 986 | self->next_bofs = self->qos_tx.additional_bofs.value; |
| 987 | if (now) |
| 988 | self->bofs_count = self->next_bofs; |
| 989 | |
| 990 | /* Set the negotiated link speed (may need the new xbofs value) */ |
| 991 | irlap_change_speed(self, self->qos_tx.baud_rate.value, now); |
| 992 | |
| 993 | self->window_size = self->qos_tx.window_size.value; |
| 994 | self->window = self->qos_tx.window_size.value; |
| 995 | |
| 996 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| 997 | /* |
| 998 | * Calculate how many bytes it is possible to transmit before the |
| 999 | * link must be turned around |
| 1000 | */ |
| 1001 | self->line_capacity = |
| 1002 | irlap_max_line_capacity(self->qos_tx.baud_rate.value, |
| 1003 | self->qos_tx.max_turn_time.value); |
| 1004 | self->bytes_left = self->line_capacity; |
| 1005 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1006 | |
| 1007 | |
| 1008 | /* |
| 1009 | * Initialize timeout values, some of the rules are listed on |
| 1010 | * page 92 in IrLAP. |
| 1011 | */ |
| 1012 | IRDA_ASSERT(self->qos_tx.max_turn_time.value != 0, return;); |
| 1013 | IRDA_ASSERT(self->qos_rx.max_turn_time.value != 0, return;); |
| 1014 | /* The poll timeout applies only to the primary station. |
| 1015 | * It defines the maximum time the primary stay in XMIT mode |
| 1016 | * before timeout and turning the link around (sending a RR). |
| 1017 | * Or, this is how much we can keep the pf bit in primary mode. |
| 1018 | * Therefore, it must be lower or equal than our *OWN* max turn around. |
| 1019 | * Jean II */ |
| 1020 | self->poll_timeout = self->qos_tx.max_turn_time.value * HZ / 1000; |
| 1021 | /* The Final timeout applies only to the primary station. |
| 1022 | * It defines the maximum time the primary wait (mostly in RECV mode) |
| 1023 | * for an answer from the secondary station before polling it again. |
| 1024 | * Therefore, it must be greater or equal than our *PARTNER* |
| 1025 | * max turn around time - Jean II */ |
| 1026 | self->final_timeout = self->qos_rx.max_turn_time.value * HZ / 1000; |
| 1027 | /* The Watchdog Bit timeout applies only to the secondary station. |
| 1028 | * It defines the maximum time the secondary wait (mostly in RECV mode) |
| 1029 | * for poll from the primary station before getting annoyed. |
| 1030 | * Therefore, it must be greater or equal than our *PARTNER* |
| 1031 | * max turn around time - Jean II */ |
| 1032 | self->wd_timeout = self->final_timeout * 2; |
| 1033 | |
| 1034 | /* |
| 1035 | * N1 and N2 are maximum retry count for *both* the final timer |
| 1036 | * and the wd timer (with a factor 2) as defined above. |
| 1037 | * After N1 retry of a timer, we give a warning to the user. |
| 1038 | * After N2 retry, we consider the link dead and disconnect it. |
| 1039 | * Jean II |
| 1040 | */ |
| 1041 | |
| 1042 | /* |
| 1043 | * Set N1 to 0 if Link Disconnect/Threshold Time = 3 and set it to |
| 1044 | * 3 seconds otherwise. See page 71 in IrLAP for more details. |
| 1045 | * Actually, it's not always 3 seconds, as we allow to set |
| 1046 | * it via sysctl... Max maxtt is 500ms, and N1 need to be multiple |
| 1047 | * of 2, so 1 second is minimum we can allow. - Jean II |
| 1048 | */ |
| 1049 | if (self->qos_tx.link_disc_time.value == sysctl_warn_noreply_time) |
| 1050 | /* |
| 1051 | * If we set N1 to 0, it will trigger immediately, which is |
| 1052 | * not what we want. What we really want is to disable it, |
| 1053 | * Jean II |
| 1054 | */ |
| 1055 | self->N1 = -2; /* Disable - Need to be multiple of 2*/ |
| 1056 | else |
| 1057 | self->N1 = sysctl_warn_noreply_time * 1000 / |
| 1058 | self->qos_rx.max_turn_time.value; |
| 1059 | |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 1060 | pr_debug("Setting N1 = %d\n", self->N1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
| 1062 | /* Set N2 to match our own disconnect time */ |
| 1063 | self->N2 = self->qos_tx.link_disc_time.value * 1000 / |
| 1064 | self->qos_rx.max_turn_time.value; |
Joe Perches | 955a9d20 | 2014-11-11 14:44:57 -0800 | [diff] [blame^] | 1065 | pr_debug("Setting N2 = %d\n", self->N2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | } |
| 1067 | |
| 1068 | #ifdef CONFIG_PROC_FS |
| 1069 | struct irlap_iter_state { |
| 1070 | int id; |
| 1071 | }; |
| 1072 | |
| 1073 | static void *irlap_seq_start(struct seq_file *seq, loff_t *pos) |
| 1074 | { |
| 1075 | struct irlap_iter_state *iter = seq->private; |
| 1076 | struct irlap_cb *self; |
| 1077 | |
| 1078 | /* Protect our access to the tsap list */ |
| 1079 | spin_lock_irq(&irlap->hb_spinlock); |
| 1080 | iter->id = 0; |
| 1081 | |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1082 | for (self = (struct irlap_cb *) hashbin_get_first(irlap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | self; self = (struct irlap_cb *) hashbin_get_next(irlap)) { |
| 1084 | if (iter->id == *pos) |
| 1085 | break; |
| 1086 | ++iter->id; |
| 1087 | } |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | return self; |
| 1090 | } |
| 1091 | |
| 1092 | static void *irlap_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1093 | { |
| 1094 | struct irlap_iter_state *iter = seq->private; |
| 1095 | |
| 1096 | ++*pos; |
| 1097 | ++iter->id; |
| 1098 | return (void *) hashbin_get_next(irlap); |
| 1099 | } |
| 1100 | |
| 1101 | static void irlap_seq_stop(struct seq_file *seq, void *v) |
| 1102 | { |
| 1103 | spin_unlock_irq(&irlap->hb_spinlock); |
| 1104 | } |
| 1105 | |
| 1106 | static int irlap_seq_show(struct seq_file *seq, void *v) |
| 1107 | { |
| 1108 | const struct irlap_iter_state *iter = seq->private; |
| 1109 | const struct irlap_cb *self = v; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EINVAL;); |
| 1112 | |
| 1113 | seq_printf(seq, "irlap%d ", iter->id); |
| 1114 | seq_printf(seq, "state: %s\n", |
| 1115 | irlap_state[self->state]); |
| 1116 | |
| 1117 | seq_printf(seq, " device name: %s, ", |
| 1118 | (self->netdev) ? self->netdev->name : "bug"); |
| 1119 | seq_printf(seq, "hardware name: %s\n", self->hw_name); |
| 1120 | |
| 1121 | seq_printf(seq, " caddr: %#02x, ", self->caddr); |
| 1122 | seq_printf(seq, "saddr: %#08x, ", self->saddr); |
| 1123 | seq_printf(seq, "daddr: %#08x\n", self->daddr); |
| 1124 | |
| 1125 | seq_printf(seq, " win size: %d, ", |
| 1126 | self->window_size); |
| 1127 | seq_printf(seq, "win: %d, ", self->window); |
| 1128 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| 1129 | seq_printf(seq, "line capacity: %d, ", |
| 1130 | self->line_capacity); |
| 1131 | seq_printf(seq, "bytes left: %d\n", self->bytes_left); |
| 1132 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| 1133 | seq_printf(seq, " tx queue len: %d ", |
| 1134 | skb_queue_len(&self->txq)); |
| 1135 | seq_printf(seq, "win queue len: %d ", |
| 1136 | skb_queue_len(&self->wx_list)); |
| 1137 | seq_printf(seq, "rbusy: %s", self->remote_busy ? |
| 1138 | "TRUE" : "FALSE"); |
| 1139 | seq_printf(seq, " mbusy: %s\n", self->media_busy ? |
| 1140 | "TRUE" : "FALSE"); |
| 1141 | |
| 1142 | seq_printf(seq, " retrans: %d ", self->retry_count); |
| 1143 | seq_printf(seq, "vs: %d ", self->vs); |
| 1144 | seq_printf(seq, "vr: %d ", self->vr); |
| 1145 | seq_printf(seq, "va: %d\n", self->va); |
| 1146 | |
| 1147 | seq_printf(seq, " qos\tbps\tmaxtt\tdsize\twinsize\taddbofs\tmintt\tldisc\tcomp\n"); |
| 1148 | |
| 1149 | seq_printf(seq, " tx\t%d\t", |
| 1150 | self->qos_tx.baud_rate.value); |
| 1151 | seq_printf(seq, "%d\t", |
| 1152 | self->qos_tx.max_turn_time.value); |
| 1153 | seq_printf(seq, "%d\t", |
| 1154 | self->qos_tx.data_size.value); |
| 1155 | seq_printf(seq, "%d\t", |
| 1156 | self->qos_tx.window_size.value); |
| 1157 | seq_printf(seq, "%d\t", |
| 1158 | self->qos_tx.additional_bofs.value); |
| 1159 | seq_printf(seq, "%d\t", |
| 1160 | self->qos_tx.min_turn_time.value); |
| 1161 | seq_printf(seq, "%d\t", |
| 1162 | self->qos_tx.link_disc_time.value); |
| 1163 | seq_printf(seq, "\n"); |
| 1164 | |
| 1165 | seq_printf(seq, " rx\t%d\t", |
| 1166 | self->qos_rx.baud_rate.value); |
| 1167 | seq_printf(seq, "%d\t", |
| 1168 | self->qos_rx.max_turn_time.value); |
| 1169 | seq_printf(seq, "%d\t", |
| 1170 | self->qos_rx.data_size.value); |
| 1171 | seq_printf(seq, "%d\t", |
| 1172 | self->qos_rx.window_size.value); |
| 1173 | seq_printf(seq, "%d\t", |
| 1174 | self->qos_rx.additional_bofs.value); |
| 1175 | seq_printf(seq, "%d\t", |
| 1176 | self->qos_rx.min_turn_time.value); |
| 1177 | seq_printf(seq, "%d\n", |
| 1178 | self->qos_rx.link_disc_time.value); |
| 1179 | |
| 1180 | return 0; |
| 1181 | } |
| 1182 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 1183 | static const struct seq_operations irlap_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | .start = irlap_seq_start, |
| 1185 | .next = irlap_seq_next, |
| 1186 | .stop = irlap_seq_stop, |
| 1187 | .show = irlap_seq_show, |
| 1188 | }; |
| 1189 | |
| 1190 | static int irlap_seq_open(struct inode *inode, struct file *file) |
| 1191 | { |
Pavel Emelyanov | a662d4c | 2007-10-10 02:30:45 -0700 | [diff] [blame] | 1192 | if (irlap == NULL) |
| 1193 | return -EINVAL; |
YOSHIFUJI Hideaki | 6819bc2 | 2007-02-09 23:24:53 +0900 | [diff] [blame] | 1194 | |
Pavel Emelyanov | a662d4c | 2007-10-10 02:30:45 -0700 | [diff] [blame] | 1195 | return seq_open_private(file, &irlap_seq_ops, |
| 1196 | sizeof(struct irlap_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 1199 | const struct file_operations irlap_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | .owner = THIS_MODULE, |
| 1201 | .open = irlap_seq_open, |
| 1202 | .read = seq_read, |
| 1203 | .llseek = seq_lseek, |
| 1204 | .release = seq_release_private, |
| 1205 | }; |
| 1206 | |
| 1207 | #endif /* CONFIG_PROC_FS */ |