1 /******************************************************************************
2 *
3 * Copyright (C) 1999-2012 Broadcom Corporation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /******************************************************************************
20 *
21 * this file contains the functions relating to link management. A "link"
22 * is a connection between this device and another device. Only ACL links
23 * are managed.
24 *
25 ******************************************************************************/
26
27 #include <stdlib.h>
28 #include <string.h>
29 //#include <stdio.h>
30
31 #include "device/controller.h"
32 //#include "btcore/include/counter.h"
33 #include "stack/bt_types.h"
34 //#include "bt_utils.h"
35 #include "stack/hcimsgs.h"
36 #include "stack/l2cdefs.h"
37 #include "l2c_int.h"
38 #include "stack/l2c_api.h"
39 #include "stack/btu.h"
40 #include "stack/btm_api.h"
41 #include "btm_int.h"
42
43 static BOOLEAN l2c_link_send_to_lower (tL2C_LCB *p_lcb, BT_HDR *p_buf);
44
45 #if (BLE_50_FEATURE_SUPPORT == TRUE)
46 extern tBTM_STATUS BTM_BleStartExtAdvRestart(uint8_t handle);
47 #endif// #if (BLE_50_FEATURE_SUPPORT == TRUE)
48 extern bool btm_ble_inter_get(void);
49
50 /*******************************************************************************
51 **
52 ** Function l2c_link_hci_conn_req
53 **
54 ** Description This function is called when an HCI Connection Request
55 ** event is received.
56 **
57 ** Returns TRUE, if accept conn
58 **
59 *******************************************************************************/
l2c_link_hci_conn_req(BD_ADDR bd_addr)60 BOOLEAN l2c_link_hci_conn_req (BD_ADDR bd_addr)
61 {
62 tL2C_LCB *p_lcb;
63 tL2C_LCB *p_lcb_cur;
64 BOOLEAN no_links;
65
66 /* See if we have a link control block for the remote device */
67 p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR);
68
69 /* If we don't have one, create one and accept the connection. */
70 if (!p_lcb) {
71 p_lcb = l2cu_allocate_lcb (bd_addr, FALSE, BT_TRANSPORT_BR_EDR);
72 if (!p_lcb) {
73 btsnd_hcic_reject_conn (bd_addr, HCI_ERR_HOST_REJECT_RESOURCES);
74 L2CAP_TRACE_ERROR ("L2CAP failed to allocate LCB");
75 return FALSE;
76 }
77
78 no_links = TRUE;
79
80 /* If we already have connection, accept as a master */
81 list_node_t *p_node = NULL;
82 for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
83 p_lcb_cur = list_node(p_node);
84 if (p_lcb_cur == p_lcb) {
85 continue;
86 }
87
88 if (p_lcb_cur->in_use) {
89 no_links = FALSE;
90 p_lcb->link_role = HCI_ROLE_MASTER;
91 break;
92 }
93 }
94
95 if (no_links) {
96 if (!btm_dev_support_switch (bd_addr)) {
97 p_lcb->link_role = HCI_ROLE_SLAVE;
98 } else {
99 p_lcb->link_role = l2cu_get_conn_role(p_lcb);
100 }
101 }
102
103 //counter_add("l2cap.conn.accept", 1);
104
105 /* Tell the other side we accept the connection */
106 btsnd_hcic_accept_conn (bd_addr, p_lcb->link_role);
107
108 p_lcb->link_state = LST_CONNECTING;
109
110 /* Start a timer waiting for connect complete */
111 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_CONNECT_TOUT);
112 return (TRUE);
113 }
114
115 /* We already had a link control block to the guy. Check what state it is in */
116 if ((p_lcb->link_state == LST_CONNECTING) || (p_lcb->link_state == LST_CONNECT_HOLDING)) {
117 /* Connection collision. Accept the connection anyways. */
118
119 if (!btm_dev_support_switch (bd_addr)) {
120 p_lcb->link_role = HCI_ROLE_SLAVE;
121 } else {
122 p_lcb->link_role = l2cu_get_conn_role(p_lcb);
123 }
124
125 //counter_add("l2cap.conn.accept", 1);
126 btsnd_hcic_accept_conn (bd_addr, p_lcb->link_role);
127
128 p_lcb->link_state = LST_CONNECTING;
129 return (TRUE);
130 } else if (p_lcb->link_state == LST_DISCONNECTING) {
131 /* In disconnecting state, reject the connection. */
132 //counter_add("l2cap.conn.reject.disconn", 1);
133 btsnd_hcic_reject_conn (bd_addr, HCI_ERR_HOST_REJECT_DEVICE);
134 } else {
135 L2CAP_TRACE_ERROR("L2CAP got conn_req while connected (state:%d). Reject it\n",
136 p_lcb->link_state);
137 /* Reject the connection with ACL Connection Already exist reason */
138 //counter_add("l2cap.conn.reject.exists", 1);
139 btsnd_hcic_reject_conn (bd_addr, HCI_ERR_CONNECTION_EXISTS);
140 }
141 return (FALSE);
142 }
143
144 /*******************************************************************************
145 **
146 ** Function l2c_link_hci_conn_comp
147 **
148 ** Description This function is called when an HCI Connection Complete
149 ** event is received.
150 **
151 ** Returns void
152 **
153 *******************************************************************************/
l2c_link_hci_conn_comp(UINT8 status,UINT16 handle,BD_ADDR p_bda)154 BOOLEAN l2c_link_hci_conn_comp (UINT8 status, UINT16 handle, BD_ADDR p_bda)
155 {
156 tL2C_CONN_INFO ci;
157 tL2C_LCB *p_lcb;
158 #if (CLASSIC_BT_INCLUDED == TRUE)
159 tL2C_CCB *p_ccb;
160 #endif ///CLASSIC_BT_INCLUDED == TRUE
161 tBTM_SEC_DEV_REC *p_dev_info = NULL;
162
163 btm_acl_update_busy_level (BTM_BLI_PAGE_DONE_EVT);
164
165 /* Save the parameters */
166 ci.status = status;
167 memcpy (ci.bd_addr, p_bda, BD_ADDR_LEN);
168
169 /* See if we have a link control block for the remote device */
170 p_lcb = l2cu_find_lcb_by_bd_addr (ci.bd_addr, BT_TRANSPORT_BR_EDR);
171
172 /* If we don't have one, this is an error */
173 if (!p_lcb) {
174 L2CAP_TRACE_WARNING ("L2CAP got conn_comp for unknown BD_ADDR\n");
175 return (FALSE);
176 }
177
178 if (p_lcb->link_state != LST_CONNECTING) {
179 L2CAP_TRACE_ERROR ("L2CAP got conn_comp in bad state: %d status: 0x%d\n", p_lcb->link_state, status);
180
181 if (status != HCI_SUCCESS) {
182 l2c_link_hci_disc_comp (p_lcb->handle, status);
183 }
184
185 return (FALSE);
186 }
187
188 /* Save the handle */
189 p_lcb->handle = handle;
190
191 if (ci.status == HCI_SUCCESS) {
192 /* Connected OK. Change state to connected */
193 p_lcb->link_state = LST_CONNECTED;
194 //counter_add("l2cap.conn.ok", 1);
195
196 /* Get the peer information if the l2cap flow-control/rtrans is supported */
197 l2cu_send_peer_info_req (p_lcb, L2CAP_EXTENDED_FEATURES_INFO_TYPE);
198
199 /* Tell BTM Acl management about the link */
200 if ((p_dev_info = btm_find_dev (p_bda)) != NULL) {
201 btm_acl_created (ci.bd_addr, p_dev_info->dev_class,
202 p_dev_info->sec_bd_name, handle,
203 p_lcb->link_role, BT_TRANSPORT_BR_EDR);
204 } else {
205 btm_acl_created (ci.bd_addr, NULL, NULL, handle, p_lcb->link_role, BT_TRANSPORT_BR_EDR);
206 }
207
208 BTM_SetLinkSuperTout (ci.bd_addr, btm_cb.btm_def_link_super_tout);
209
210 /* If dedicated bonding do not process any further */
211 if (p_lcb->is_bonding) {
212 if (l2cu_start_post_bond_timer(handle)) {
213 return (TRUE);
214 }
215 }
216
217 /* Update the timeouts in the hold queue */
218 l2c_process_held_packets(FALSE);
219
220 btu_stop_timer (&p_lcb->timer_entry);
221 #if (CLASSIC_BT_INCLUDED == TRUE)
222 /* For all channels, send the event through their FSMs */
223 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
224 l2c_csm_execute (p_ccb, L2CEVT_LP_CONNECT_CFM, &ci);
225 }
226 #endif ///CLASSIC_BT_INCLUDED == TRUE
227 if (p_lcb->p_echo_rsp_cb) {
228 l2cu_send_peer_echo_req (p_lcb, NULL, 0);
229 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_ECHO_RSP_TOUT);
230 } else if (!p_lcb->ccb_queue.p_first_ccb) {
231 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_STARTUP_TOUT);
232 }
233 }
234 /* Max number of acl connections. */
235 /* If there's an lcb disconnecting set this one to holding */
236 else if ((ci.status == HCI_ERR_MAX_NUM_OF_CONNECTIONS) && l2cu_lcb_disconnecting()) {
237 p_lcb->link_state = LST_CONNECT_HOLDING;
238 p_lcb->handle = HCI_INVALID_HANDLE;
239 } else {
240 /* Just in case app decides to try again in the callback context */
241 p_lcb->link_state = LST_DISCONNECTING;
242 #if(CLASSIC_BT_INCLUDED == TRUE)
243 /* Connection failed. For all channels, send the event through */
244 /* their FSMs. The CCBs should remove themselves from the LCB */
245 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; ) {
246 tL2C_CCB *pn = p_ccb->p_next_ccb;
247
248 l2c_csm_execute (p_ccb, L2CEVT_LP_CONNECT_CFM_NEG, &ci);
249
250 p_ccb = pn;
251 }
252 #endif ///CLASSIC_BT_INCLUDED == TRUE
253 p_lcb->disc_reason = status;
254 /* Release the LCB */
255 if (p_lcb->ccb_queue.p_first_ccb == NULL) {
256 l2cu_release_lcb (p_lcb);
257 } else { /* there are any CCBs remaining */
258 if (ci.status == HCI_ERR_CONNECTION_EXISTS) {
259 /* we are in collision situation, wait for connection request from controller */
260 p_lcb->link_state = LST_CONNECTING;
261 } else {
262 l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR);
263 }
264 }
265 }
266 return (TRUE);
267 }
268
269
270 /*******************************************************************************
271 **
272 ** Function l2c_link_sec_comp
273 **
274 ** Description This function is called when required security procedures
275 ** are completed.
276 **
277 ** Returns void
278 **
279 *******************************************************************************/
l2c_link_sec_comp(BD_ADDR p_bda,tBT_TRANSPORT transport,void * p_ref_data,UINT8 status)280 void l2c_link_sec_comp (BD_ADDR p_bda, tBT_TRANSPORT transport, void *p_ref_data, UINT8 status)
281 {
282 tL2C_CONN_INFO ci;
283 tL2C_LCB *p_lcb;
284 tL2C_CCB *p_ccb;
285 tL2C_CCB *p_next_ccb;
286 #if (CLASSIC_BT_INCLUDED == TRUE)
287 UINT8 event;
288 #endif ///CLASSIC_BT_INCLUDED == TRUE
289 UNUSED(transport);
290
291 L2CAP_TRACE_DEBUG ("l2c_link_sec_comp: %d, %p", status, p_ref_data);
292
293 if (status == BTM_SUCCESS_NO_SECURITY) {
294 status = BTM_SUCCESS;
295 }
296
297 /* Save the parameters */
298 ci.status = status;
299 memcpy (ci.bd_addr, p_bda, BD_ADDR_LEN);
300
301 p_lcb = l2cu_find_lcb_by_bd_addr (p_bda, BT_TRANSPORT_BR_EDR);
302
303 /* If we don't have one, this is an error */
304 if (!p_lcb) {
305 L2CAP_TRACE_WARNING ("L2CAP got sec_comp for unknown BD_ADDR\n");
306 return;
307 }
308
309 /* Match p_ccb with p_ref_data returned by sec manager */
310 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_next_ccb) {
311 p_next_ccb = p_ccb->p_next_ccb;
312
313 if (p_ccb == p_ref_data) {
314 switch (status) {
315 case BTM_SUCCESS:
316 L2CAP_TRACE_DEBUG ("ccb timer ticks: %u", p_ccb->timer_entry.ticks);
317 #if (CLASSIC_BT_INCLUDED == TRUE)
318 event = L2CEVT_SEC_COMP;
319 #endif ///CLASSIC_BT_INCLUDED == TRUE
320 break;
321
322 case BTM_DELAY_CHECK:
323 /* start a timer - encryption change not received before L2CAP connect req */
324 btu_start_timer (&p_ccb->timer_entry, BTU_TTYPE_L2CAP_CHNL, L2CAP_DELAY_CHECK_SM4);
325 return;
326
327 default:
328 #if (CLASSIC_BT_INCLUDED == TRUE)
329 event = L2CEVT_SEC_COMP_NEG;
330 #endif ///CLASSIC_BT_INCLUDED == TRUE
331 break;
332 }
333 #if (CLASSIC_BT_INCLUDED == TRUE)
334 l2c_csm_execute (p_ccb, event, &ci);
335 #endif ///CLASSIC_BT_INCLUDED == TRUE
336 break;
337 }
338 }
339 }
340
341 /*******************************************************************************
342 **
343 ** Function l2c_link_hci_disc_comp
344 **
345 ** Description This function is called when an HCI Disconnect Complete
346 ** event is received.
347 **
348 ** Returns TRUE if the link is known about, else FALSE
349 **
350 *******************************************************************************/
l2c_link_hci_disc_comp(UINT16 handle,UINT8 reason)351 BOOLEAN l2c_link_hci_disc_comp (UINT16 handle, UINT8 reason)
352 {
353 tL2C_LCB *p_lcb;
354 #if (CLASSIC_BT_INCLUDED == TRUE)
355 tL2C_CCB *p_ccb;
356 #endif ///CLASSIC_BT_INCLUDED == TRUE
357 BOOLEAN status = TRUE;
358 BOOLEAN lcb_is_free = TRUE;
359 tBT_TRANSPORT transport = BT_TRANSPORT_BR_EDR;
360
361 /* See if we have a link control block for the connection */
362 p_lcb = l2cu_find_lcb_by_handle (handle);
363 /* If we don't have one, maybe an SCO link. Send to MM */
364 if (!p_lcb) {
365 #if (BLE_INCLUDED == TRUE)
366 /* The Directed Advertising Timeout error code indicates that directed advertising completed */
367 if (reason != HCI_ERR_DIRECTED_ADVERTISING_TIMEOUT) {
368 BTM_Recovery_Pre_State();
369 }
370 #endif ///BLE_INCLUDED == TRUE
371 status = FALSE;
372 } else {
373 /* There can be a case when we rejected PIN code authentication */
374 /* otherwise save a new reason */
375 if (btm_cb.acl_disc_reason != HCI_ERR_HOST_REJECT_SECURITY) {
376 btm_cb.acl_disc_reason = reason;
377 }
378
379 p_lcb->disc_reason = btm_cb.acl_disc_reason;
380
381 /* Just in case app decides to try again in the callback context */
382 p_lcb->link_state = LST_DISCONNECTING;
383
384 #if (BLE_INCLUDED == TRUE)
385 /* Check for BLE and handle that differently */
386 if (p_lcb->transport == BT_TRANSPORT_LE) {
387 btm_ble_update_link_topology_mask(p_lcb->link_role, FALSE);
388 }
389 #endif
390 #if (CLASSIC_BT_INCLUDED == TRUE)
391 /* Link is disconnected. For all channels, send the event through */
392 /* their FSMs. The CCBs should remove themselves from the LCB */
393 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; ) {
394 tL2C_CCB *pn = p_ccb->p_next_ccb;
395
396 /* Keep connect pending control block (if exists)
397 * Possible Race condition when a reconnect occurs
398 * on the channel during a disconnect of link. This
399 * ccb will be automatically retried after link disconnect
400 * arrives
401 */
402 if (p_ccb != p_lcb->p_pending_ccb) {
403 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, &reason);
404 }
405 p_ccb = pn;
406 }
407 #endif ///CLASSIC_BT_INCLUDED == TRUE
408 #if (BTM_SCO_INCLUDED == TRUE)
409 #if (BLE_INCLUDED == TRUE)
410 if (p_lcb->transport == BT_TRANSPORT_BR_EDR)
411 #endif
412 {
413 /* Tell SCO management to drop any SCOs on this ACL */
414 btm_sco_acl_removed (p_lcb->remote_bd_addr);
415 }
416 #endif
417
418 /* If waiting for disconnect and reconnect is pending start the reconnect now
419 race condition where layer above issued connect request on link that was
420 disconnecting
421 */
422 if (p_lcb->ccb_queue.p_first_ccb != NULL || p_lcb->p_pending_ccb) {
423 L2CAP_TRACE_DEBUG("l2c_link_hci_disc_comp: Restarting pending ACL request");
424 transport = p_lcb->transport;
425 #if BLE_INCLUDED == TRUE
426 /* for LE link, always drop and re-open to ensure to get LE remote feature */
427 if (p_lcb->transport == BT_TRANSPORT_LE) {
428 l2cb.is_ble_connecting = FALSE;
429 btm_acl_removed (p_lcb->remote_bd_addr, p_lcb->transport);
430 /* Release any held buffers */
431 BT_HDR *p_buf;
432 while (!list_is_empty(p_lcb->link_xmit_data_q)) {
433 p_buf = list_front(p_lcb->link_xmit_data_q);
434 list_remove(p_lcb->link_xmit_data_q, p_buf);
435 osi_free(p_buf);
436 }
437 } else
438 #endif
439 {
440 #if (L2CAP_NUM_FIXED_CHNLS > 0)
441 /* If we are going to re-use the LCB without dropping it, release all fixed channels
442 here */
443 int xx;
444 for (xx = 0; xx < L2CAP_NUM_FIXED_CHNLS; xx++) {
445 if (p_lcb->p_fixed_ccbs[xx] && p_lcb->p_fixed_ccbs[xx] != p_lcb->p_pending_ccb) {
446 #if BLE_INCLUDED == TRUE
447 (*l2cb.fixed_reg[xx].pL2CA_FixedConn_Cb)(xx + L2CAP_FIRST_FIXED_CHNL,
448 p_lcb->remote_bd_addr, FALSE, p_lcb->disc_reason, p_lcb->transport);
449 #else
450 (*l2cb.fixed_reg[xx].pL2CA_FixedConn_Cb)(xx + L2CAP_FIRST_FIXED_CHNL,
451 p_lcb->remote_bd_addr, FALSE, p_lcb->disc_reason, BT_TRANSPORT_BR_EDR);
452 #endif
453 l2cu_release_ccb (p_lcb->p_fixed_ccbs[xx]);
454
455 p_lcb->p_fixed_ccbs[xx] = NULL;
456 }
457 }
458 #endif
459 }
460 if (l2cu_create_conn(p_lcb, transport)) {
461 lcb_is_free = FALSE; /* still using this lcb */
462 }
463 }
464
465 p_lcb->p_pending_ccb = NULL;
466 #if (BLE_INCLUDED == TRUE && GATTC_CONNECT_RETRY_EN == TRUE)
467 if(reason == HCI_ERR_CONN_FAILED_ESTABLISHMENT && p_lcb->transport == BT_TRANSPORT_LE) {
468
469 if(p_lcb->link_role == HCI_ROLE_MASTER && p_lcb->retry_create_con < GATTC_CONNECT_RETRY_COUNT) {
470 L2CAP_TRACE_DEBUG("master retry connect, retry count %d reason 0x%x\n", p_lcb->retry_create_con, reason);
471 p_lcb->retry_create_con ++;
472 // create connection retry
473 if (l2cu_create_conn(p_lcb, BT_TRANSPORT_LE)) {
474 btm_acl_removed (p_lcb->remote_bd_addr, BT_TRANSPORT_LE);
475 lcb_is_free = FALSE; /* still using this lcb */
476 }
477 }
478
479 #if (BLE_50_FEATURE_SUPPORT == TRUE)
480 if(btm_ble_inter_get() && p_lcb->link_role == HCI_ROLE_SLAVE && p_lcb->retry_create_con < GATTC_CONNECT_RETRY_COUNT) {
481 p_lcb->retry_create_con ++;
482 L2CAP_TRACE_DEBUG("slave restart extend adv, retry count %d reason 0x%x\n", p_lcb->retry_create_con, reason);
483 BTM_BleStartExtAdvRestart(handle);
484 }
485 #endif // #if (BLE_50_FEATURE_SUPPORT == TRUE)
486
487 #if (BLE_42_FEATURE_SUPPORT == TRUE)
488 if(!btm_ble_inter_get() && p_lcb->link_role == HCI_ROLE_SLAVE && p_lcb->retry_create_con < GATTC_CONNECT_RETRY_COUNT) {
489 p_lcb->retry_create_con ++;
490 L2CAP_TRACE_DEBUG("slave resatrt adv, retry count %d reason 0x%x\n", p_lcb->retry_create_con, reason);
491 btm_ble_start_adv();
492 }
493 #endif // #if (BLE_42_FEATURE_SUPPORT == TRUE)
494 }
495
496
497 #endif // #if (BLE_INCLUDED == TRUE)
498 /* Release the LCB */
499 if (lcb_is_free) {
500 l2cu_release_lcb (p_lcb);
501 }
502 }
503
504 /* Now that we have a free acl connection, see if any lcbs are pending */
505 if (lcb_is_free && ((p_lcb = l2cu_find_lcb_by_state(LST_CONNECT_HOLDING)) != NULL)) {
506 /* we found one-- create a connection */
507 l2cu_create_conn(p_lcb, BT_TRANSPORT_BR_EDR);
508 }
509
510 return status;
511 }
512
513
514 /*******************************************************************************
515 **
516 ** Function l2c_link_hci_qos_violation
517 **
518 ** Description This function is called when an HCI QOS Violation
519 ** event is received.
520 **
521 ** Returns TRUE if the link is known about, else FALSE
522 **
523 *******************************************************************************/
l2c_link_hci_qos_violation(UINT16 handle)524 BOOLEAN l2c_link_hci_qos_violation (UINT16 handle)
525 {
526 tL2C_LCB *p_lcb;
527 #if (CLASSIC_BT_INCLUDED == TRUE)
528 tL2C_CCB *p_ccb;
529 #endif ///CLASSIC_BT_INCLUDED == TRUE
530 /* See if we have a link control block for the connection */
531 p_lcb = l2cu_find_lcb_by_handle (handle);
532
533 /* If we don't have one, maybe an SCO link. */
534 if (!p_lcb) {
535 return (FALSE);
536 }
537 #if (CLASSIC_BT_INCLUDED == TRUE)
538 /* For all channels, tell the upper layer about it */
539 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
540 if (p_ccb->p_rcb->api.pL2CA_QoSViolationInd_Cb) {
541 l2c_csm_execute (p_ccb, L2CEVT_LP_QOS_VIOLATION_IND, NULL);
542 }
543 }
544 #endif ///CLASSIC_BT_INCLUDED == TRUE
545 return (TRUE);
546 }
547
548
549
550 /*******************************************************************************
551 **
552 ** Function l2c_link_timeout
553 **
554 ** Description This function is called when a link timer expires
555 **
556 ** Returns void
557 **
558 *******************************************************************************/
l2c_link_timeout(tL2C_LCB * p_lcb)559 void l2c_link_timeout (tL2C_LCB *p_lcb)
560 {
561 #if (CLASSIC_BT_INCLUDED == TRUE)
562 tL2C_CCB *p_ccb;
563 #endif ///CLASSIC_BT_INCLUDED == TRUE
564 #if (SMP_INCLUDED == TRUE)
565 UINT16 timeout;
566 tBTM_STATUS rc;
567 #endif ///SMP_INCLUDED == TRUE
568 L2CAP_TRACE_EVENT ("L2CAP - l2c_link_timeout() link state %d first CCB %p is_bonding:%d",
569 p_lcb->link_state, p_lcb->ccb_queue.p_first_ccb, p_lcb->is_bonding);
570
571 /* If link was connecting or disconnecting, clear all channels and drop the LCB */
572 if ((p_lcb->link_state == LST_CONNECTING_WAIT_SWITCH) ||
573 (p_lcb->link_state == LST_CONNECTING) ||
574 (p_lcb->link_state == LST_CONNECT_HOLDING) ||
575 (p_lcb->link_state == LST_DISCONNECTING)) {
576 p_lcb->p_pending_ccb = NULL;
577 #if (CLASSIC_BT_INCLUDED == TRUE)
578 /* For all channels, send a disconnect indication event through */
579 /* their FSMs. The CCBs should remove themselves from the LCB */
580 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; ) {
581 tL2C_CCB *pn = p_ccb->p_next_ccb;
582
583 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
584
585 p_ccb = pn;
586 }
587 #endif ///CLASSIC_BT_INCLUDED == TRUE
588 #if (BLE_INCLUDED == TRUE)
589 if (p_lcb->link_state == LST_CONNECTING &&
590 l2cb.is_ble_connecting == TRUE) {
591 L2CA_CancelBleConnectReq(l2cb.ble_connecting_bda);
592 }
593 #endif
594 /* Release the LCB */
595 l2cu_release_lcb (p_lcb);
596 }
597
598 /* If link is connected, check for inactivity timeout */
599 if (p_lcb->link_state == LST_CONNECTED) {
600 /* Check for ping outstanding */
601 if (p_lcb->p_echo_rsp_cb) {
602 tL2CA_ECHO_RSP_CB *p_cb = p_lcb->p_echo_rsp_cb;
603
604 /* Zero out the callback in case app immediately calls us again */
605 p_lcb->p_echo_rsp_cb = NULL;
606
607 (*p_cb) (L2CAP_PING_RESULT_NO_RESP);
608
609 L2CAP_TRACE_WARNING ("L2CAP - ping timeout");
610 #if (CLASSIC_BT_INCLUDED == TRUE)
611 /* For all channels, send a disconnect indication event through */
612 /* their FSMs. The CCBs should remove themselves from the LCB */
613 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; ) {
614 tL2C_CCB *pn = p_ccb->p_next_ccb;
615
616 l2c_csm_execute (p_ccb, L2CEVT_LP_DISCONNECT_IND, NULL);
617
618 p_ccb = pn;
619 }
620 #endif ///CLASSIC_BT_INCLUDED == TRUE
621 }
622
623 #if (SMP_INCLUDED == TRUE)
624 /* If no channels in use, drop the link. */
625 if (!p_lcb->ccb_queue.p_first_ccb) {
626 rc = btm_sec_disconnect (p_lcb->handle, HCI_ERR_PEER_USER);
627
628 if (rc == BTM_CMD_STORED) {
629 /* Security Manager will take care of disconnecting, state will be updated at that time */
630 timeout = 0xFFFF;
631 } else if (rc == BTM_CMD_STARTED) {
632 p_lcb->link_state = LST_DISCONNECTING;
633 timeout = L2CAP_LINK_DISCONNECT_TOUT;
634 } else if (rc == BTM_SUCCESS) {
635 l2cu_process_fixed_disc_cback(p_lcb);
636 /* BTM SEC will make sure that link is release (probably after pairing is done) */
637 p_lcb->link_state = LST_DISCONNECTING;
638 timeout = 0xFFFF;
639 } else if (rc == BTM_BUSY) {
640 /* BTM is still executing security process. Let lcb stay as connected */
641 timeout = 0xFFFF;
642 } else if ((p_lcb->is_bonding)
643 && (btsnd_hcic_disconnect (p_lcb->handle, HCI_ERR_PEER_USER))) {
644 l2cu_process_fixed_disc_cback(p_lcb);
645 p_lcb->link_state = LST_DISCONNECTING;
646 timeout = L2CAP_LINK_DISCONNECT_TOUT;
647 } else {
648 /* probably no buffer to send disconnect */
649 timeout = BT_1SEC_TIMEOUT;
650 }
651
652 if (timeout != 0xFFFF) {
653 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, timeout);
654 }
655 } else {
656 /* Check in case we were flow controlled */
657 l2c_link_check_send_pkts (p_lcb, NULL, NULL);
658 }
659 #endif ///SMP_INCLUDED == TRUE
660 }
661 }
662
663 /*******************************************************************************
664 **
665 ** Function l2c_info_timeout
666 **
667 ** Description This function is called when an info request times out
668 **
669 ** Returns void
670 **
671 *******************************************************************************/
l2c_info_timeout(tL2C_LCB * p_lcb)672 void l2c_info_timeout (tL2C_LCB *p_lcb)
673 {
674 tL2C_CCB *p_ccb;
675 #if (CLASSIC_BT_INCLUDED == TRUE)
676 tL2C_CONN_INFO ci;
677 #endif ///CLASSIC_BT_INCLUDED == TRUE
678 /* If we timed out waiting for info response, just continue using basic if allowed */
679 if (p_lcb->w4_info_rsp) {
680 /* If waiting for security complete, restart the info response timer */
681 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
682 if ( (p_ccb->chnl_state == CST_ORIG_W4_SEC_COMP) || (p_ccb->chnl_state == CST_TERM_W4_SEC_COMP) ) {
683 btu_start_timer (&p_lcb->info_timer_entry, BTU_TTYPE_L2CAP_INFO, L2CAP_WAIT_INFO_RSP_TOUT);
684 return;
685 }
686 }
687
688 p_lcb->w4_info_rsp = FALSE;
689 #if (CLASSIC_BT_INCLUDED == TRUE)
690 /* If link is in process of being brought up */
691 if ((p_lcb->link_state != LST_DISCONNECTED) &&
692 (p_lcb->link_state != LST_DISCONNECTING)) {
693 /* Notify active channels that peer info is finished */
694 if (p_lcb->ccb_queue.p_first_ccb) {
695 ci.status = HCI_SUCCESS;
696 memcpy (ci.bd_addr, p_lcb->remote_bd_addr, sizeof(BD_ADDR));
697
698 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
699 l2c_csm_execute (p_ccb, L2CEVT_L2CAP_INFO_RSP, &ci);
700 }
701 }
702 }
703 #endif ///CLASSIC_BT_INCLUDED == TRUE
704 }
705 }
706
707 /*******************************************************************************
708 **
709 ** Function l2c_link_adjust_allocation
710 **
711 ** Description This function is called when a link is created or removed
712 ** to calculate the amount of packets each link may send to
713 ** the HCI without an ack coming back.
714 **
715 ** Currently, this is a simple allocation, dividing the
716 ** number of Controller Packets by the number of links. In
717 ** the future, QOS configuration should be examined.
718 **
719 ** Returns void
720 **
721 *******************************************************************************/
l2c_link_adjust_allocation(void)722 void l2c_link_adjust_allocation (void)
723 {
724 UINT16 qq, qq_remainder;
725 tL2C_LCB *p_lcb;
726 UINT16 hi_quota, low_quota;
727 UINT16 num_lowpri_links = 0;
728 UINT16 num_hipri_links = 0;
729 UINT16 controller_xmit_quota = l2cb.num_lm_acl_bufs;
730 UINT16 high_pri_link_quota = L2CAP_HIGH_PRI_MIN_XMIT_QUOTA_A;
731 list_node_t *p_node = NULL;
732
733 /* If no links active, reset buffer quotas and controller buffers */
734 if (l2cb.num_links_active == 0) {
735 l2cb.controller_xmit_window = l2cb.num_lm_acl_bufs;
736 l2cb.round_robin_quota = l2cb.round_robin_unacked = 0;
737 return;
738 }
739
740 /* First, count the links */
741 for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
742 p_lcb = list_node(p_node);
743 if (p_lcb->in_use) {
744 if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH) {
745 num_hipri_links++;
746 } else {
747 num_lowpri_links++;
748 }
749 }
750 }
751
752 /* now adjust high priority link quota */
753 low_quota = num_lowpri_links ? 1 : 0;
754 while ( (num_hipri_links * high_pri_link_quota + low_quota) > controller_xmit_quota ) {
755 high_pri_link_quota--;
756 }
757
758 /* Work out the xmit quota and buffer quota high and low priorities */
759 hi_quota = num_hipri_links * high_pri_link_quota;
760 low_quota = (hi_quota < controller_xmit_quota) ? controller_xmit_quota - hi_quota : 1;
761
762 /* Work out and save the HCI xmit quota for each low priority link */
763
764 /* If each low priority link cannot have at least one buffer */
765 if (num_lowpri_links > low_quota) {
766 l2cb.round_robin_quota = low_quota;
767 qq = qq_remainder = 1;
768 }
769 /* If each low priority link can have at least one buffer */
770 else if (num_lowpri_links > 0) {
771 l2cb.round_robin_quota = 0;
772 l2cb.round_robin_unacked = 0;
773 qq = low_quota / num_lowpri_links;
774 qq_remainder = low_quota % num_lowpri_links;
775 }
776 /* If no low priority link */
777 else {
778 l2cb.round_robin_quota = 0;
779 l2cb.round_robin_unacked = 0;
780 qq = qq_remainder = 1;
781 }
782
783 L2CAP_TRACE_EVENT ("l2c_link_adjust_allocation num_hipri: %u num_lowpri: %u low_quota: %u round_robin_quota: %u qq: %u\n",
784 num_hipri_links, num_lowpri_links, low_quota,
785 l2cb.round_robin_quota, qq);
786
787 /* Now, assign the quotas to each link */
788 p_node = NULL;
789 for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
790 p_lcb = list_node(p_node);
791 if (p_lcb->in_use) {
792 if (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH) {
793 p_lcb->link_xmit_quota = high_pri_link_quota;
794 } else {
795 /* Safety check in case we switched to round-robin with something outstanding */
796 /* if sent_not_acked is added into round_robin_unacked then don't add it again */
797 /* l2cap keeps updating sent_not_acked for exiting from round robin */
798 if (( p_lcb->link_xmit_quota > 0 ) && ( qq == 0 )) {
799 l2cb.round_robin_unacked += p_lcb->sent_not_acked;
800 }
801
802 p_lcb->link_xmit_quota = qq;
803 if (qq_remainder > 0) {
804 p_lcb->link_xmit_quota++;
805 qq_remainder--;
806 }
807 }
808
809 L2CAP_TRACE_EVENT ("l2c_link_adjust_allocation Priority: %d XmitQuota: %d\n",
810 p_lcb->acl_priority, p_lcb->link_xmit_quota);
811
812 L2CAP_TRACE_EVENT (" SentNotAcked: %d RRUnacked: %d\n",
813 p_lcb->sent_not_acked, l2cb.round_robin_unacked);
814
815 /* There is a special case where we have readjusted the link quotas and */
816 /* this link may have sent anything but some other link sent packets so */
817 /* so we may need a timer to kick off this link's transmissions. */
818 if ( (p_lcb->link_state == LST_CONNECTED)
819 && (!list_is_empty(p_lcb->link_xmit_data_q))
820 && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota) ) {
821 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_FLOW_CONTROL_TOUT);
822 }
823 }
824 }
825
826 }
827
828 /*******************************************************************************
829 **
830 ** Function l2c_link_adjust_chnl_allocation
831 **
832 ** Description This function is called to calculate the amount of packets each
833 ** non-F&EC channel may have outstanding.
834 **
835 ** Currently, this is a simple allocation, dividing the number
836 ** of packets allocated to the link by the number of channels. In
837 ** the future, QOS configuration should be examined.
838 **
839 ** Returns void
840 **
841 *******************************************************************************/
842
l2c_chnl_allocation_in_ccb_list(void * p_ccb_node,void * context)843 bool l2c_chnl_allocation_in_ccb_list (void *p_ccb_node, void *context)
844 {
845 UNUSED(context);
846 tL2C_CCB *p_ccb = (tL2C_CCB *)p_ccb_node;
847 if (p_ccb->in_use) {
848 tL2CAP_CHNL_DATA_RATE data_rate = p_ccb->tx_data_rate + p_ccb->rx_data_rate;
849 p_ccb->buff_quota = L2CAP_CBB_DEFAULT_DATA_RATE_BUFF_QUOTA * data_rate;
850 L2CAP_TRACE_EVENT("CID:0x%04x FCR Mode:%u Priority:%u TxDataRate:%u RxDataRate:%u Quota:%u",
851 p_ccb->local_cid, p_ccb->peer_cfg.fcr.mode,
852 p_ccb->ccb_priority, p_ccb->tx_data_rate,
853 p_ccb->rx_data_rate, p_ccb->buff_quota);
854
855 /* quota may be change so check congestion */
856 l2cu_check_channel_congestion (p_ccb);
857 }
858 return false;
859 }
l2c_link_adjust_chnl_allocation(void)860 void l2c_link_adjust_chnl_allocation (void)
861 {
862
863 L2CAP_TRACE_DEBUG ("l2c_link_adjust_chnl_allocation");
864
865 /* assign buffer quota to each channel based on its data rate requirement */
866 list_foreach(l2cb.p_ccb_pool, l2c_chnl_allocation_in_ccb_list, NULL);
867 }
868
869 /*******************************************************************************
870 **
871 ** Function l2c_link_processs_num_bufs
872 **
873 ** Description This function is called when a "controller buffer size"
874 ** event is first received from the controller. It updates
875 ** the L2CAP values.
876 **
877 ** Returns void
878 **
879 *******************************************************************************/
l2c_link_processs_num_bufs(UINT16 num_lm_acl_bufs)880 void l2c_link_processs_num_bufs (UINT16 num_lm_acl_bufs)
881 {
882 l2cb.num_lm_acl_bufs = l2cb.controller_xmit_window = num_lm_acl_bufs;
883
884 }
885
886 /*******************************************************************************
887 **
888 ** Function l2c_link_pkts_rcvd
889 **
890 ** Description This function is called from the HCI transport when it is time
891 ** tto send a "Host ready for packets" command. This is only when
892 ** host to controller flow control is used. If fills in the arrays
893 ** of numbers of packets and handles.
894 **
895 ** Returns count of number of entries filled in
896 **
897 *******************************************************************************/
l2c_link_pkts_rcvd(UINT16 * num_pkts,UINT16 * handles)898 UINT8 l2c_link_pkts_rcvd (UINT16 *num_pkts, UINT16 *handles)
899 {
900 UINT8 num_found = 0;
901
902 UNUSED(num_pkts);
903 UNUSED(handles);
904
905 return (num_found);
906 }
907
908 /*******************************************************************************
909 **
910 ** Function l2c_link_role_changed
911 **
912 ** Description This function is called whan a link's master/slave role change
913 ** event is received. It simply updates the link control block.
914 **
915 ** Returns void
916 **
917 *******************************************************************************/
l2c_link_role_changed(BD_ADDR bd_addr,UINT8 new_role,UINT8 hci_status)918 void l2c_link_role_changed (BD_ADDR bd_addr, UINT8 new_role, UINT8 hci_status)
919 {
920 tL2C_LCB *p_lcb;
921
922 /* Make sure not called from HCI Command Status (bd_addr and new_role are invalid) */
923 if (bd_addr) {
924 /* If here came form hci role change event */
925 p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR);
926 if (p_lcb) {
927 p_lcb->link_role = new_role;
928
929 /* Reset high priority link if needed */
930 if (hci_status == HCI_SUCCESS) {
931 l2cu_set_acl_priority(bd_addr, p_lcb->acl_priority, TRUE);
932 }
933 }
934 }
935
936 /* Check if any LCB was waiting for switch to be completed */
937 list_node_t *p_node = NULL;
938 for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
939 p_lcb = list_node(p_node);
940 if ((p_lcb->in_use) && (p_lcb->link_state == LST_CONNECTING_WAIT_SWITCH)) {
941 l2cu_create_conn_after_switch (p_lcb);
942 }
943 }
944 }
945
946 /*******************************************************************************
947 **
948 ** Function l2c_pin_code_request
949 **
950 ** Description This function is called whan a pin-code request is received
951 ** on a connection. If there are no channels active yet on the
952 ** link, it extends the link first connection timer. Make sure
953 ** that inactivity timer is not extended if PIN code happens
954 ** to be after last ccb released.
955 **
956 ** Returns void
957 **
958 *******************************************************************************/
l2c_pin_code_request(BD_ADDR bd_addr)959 void l2c_pin_code_request (BD_ADDR bd_addr)
960 {
961 tL2C_LCB *p_lcb = l2cu_find_lcb_by_bd_addr (bd_addr, BT_TRANSPORT_BR_EDR);
962
963 if ( (p_lcb) && (!p_lcb->ccb_queue.p_first_ccb) ) {
964 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_CONNECT_TOUT_EXT);
965 }
966 }
967
968 #if L2CAP_WAKE_PARKED_LINK == TRUE
969 /*******************************************************************************
970 **
971 ** Function l2c_link_check_power_mode
972 **
973 ** Description This function is called to check power mode.
974 **
975 ** Returns TRUE if link is going to be active from park
976 ** FALSE if nothing to send or not in park mode
977 **
978 *******************************************************************************/
l2c_link_check_power_mode(tL2C_LCB * p_lcb)979 BOOLEAN l2c_link_check_power_mode (tL2C_LCB *p_lcb)
980 {
981 tBTM_PM_MODE mode;
982 tL2C_CCB *p_ccb;
983 BOOLEAN need_to_active = FALSE;
984
985 /*
986 * We only switch park to active only if we have unsent packets
987 */
988 if (list_is_empty(p_lcb->link_xmit_data_q)) {
989 for (p_ccb = p_lcb->ccb_queue.p_first_ccb; p_ccb; p_ccb = p_ccb->p_next_ccb) {
990 if (!fixed_queue_is_empty(p_ccb->xmit_hold_q)) {
991 need_to_active = TRUE;
992 break;
993 }
994 }
995 } else {
996 need_to_active = TRUE;
997 }
998
999 /* if we have packets to send */
1000 if ( need_to_active ) {
1001 /* check power mode */
1002 if (BTM_ReadPowerMode(p_lcb->remote_bd_addr, &mode) == BTM_SUCCESS) {
1003 if ( mode == BTM_PM_STS_PENDING ) {
1004 L2CAP_TRACE_DEBUG ("LCB(0x%x) is in PM pending state\n", p_lcb->handle);
1005
1006 return TRUE;
1007 }
1008 }
1009 }
1010 return FALSE;
1011 }
1012 #endif /* L2CAP_WAKE_PARKED_LINK == TRUE) */
1013
1014 /*******************************************************************************
1015 **
1016 ** Function l2c_link_check_send_pkts
1017 **
1018 ** Description This function is called to check if it can send packets
1019 ** to the Host Controller. It may be passed the address of
1020 ** a packet to send.
1021 **
1022 ** Returns void
1023 **
1024 *******************************************************************************/
l2c_link_check_send_pkts(tL2C_LCB * p_lcb,tL2C_CCB * p_ccb,BT_HDR * p_buf)1025 void l2c_link_check_send_pkts (tL2C_LCB *p_lcb, tL2C_CCB *p_ccb, BT_HDR *p_buf)
1026 {
1027 BOOLEAN single_write = FALSE;
1028 L2CAP_TRACE_DEBUG("%s",__func__);
1029 /* Save the channel ID for faster counting */
1030 if (p_buf) {
1031 if (p_ccb != NULL) {
1032 p_buf->event = p_ccb->local_cid;
1033 single_write = TRUE;
1034 } else {
1035 p_buf->event = 0;
1036 }
1037
1038 p_buf->layer_specific = 0;
1039 list_append(p_lcb->link_xmit_data_q, p_buf);
1040
1041 if (p_lcb->link_xmit_quota == 0) {
1042 #if BLE_INCLUDED == TRUE
1043 if (p_lcb->transport == BT_TRANSPORT_LE) {
1044 l2cb.ble_check_round_robin = TRUE;
1045 } else
1046 #endif
1047 {
1048 l2cb.check_round_robin = TRUE;
1049 }
1050 }
1051 }
1052
1053 /* If this is called from uncongested callback context break recursive calling.
1054 ** This LCB will be served when receiving number of completed packet event.
1055 */
1056 if (l2cb.is_cong_cback_context) {
1057 L2CAP_TRACE_ERROR("l2cab is_cong_cback_context");
1058 return;
1059 }
1060
1061 /* If we are in a scenario where there are not enough buffers for each link to
1062 ** have at least 1, then do a round-robin for all the LCBs
1063 */
1064 if ( (p_lcb == NULL) || (p_lcb->link_xmit_quota == 0) ) {
1065 list_node_t *p_node = NULL;
1066 tL2C_LCB *p_lcb_cur = NULL;
1067 if (p_lcb == NULL) {
1068 p_node = list_begin(l2cb.p_lcb_pool);
1069 p_lcb = list_node(p_node);
1070 } else if (!single_write) {
1071 for (p_node = list_begin(l2cb.p_lcb_pool); p_node; p_node = list_next(p_node)) {
1072 p_lcb_cur = list_node(p_node);
1073 if (p_lcb_cur == p_lcb) {
1074 p_node = list_next(p_node);
1075 p_lcb = list_node(p_node);
1076 break;
1077 }
1078 }
1079 }
1080
1081 /* Loop through, starting at the next */
1082 for ( ; p_node; p_node = list_next(p_node)) {
1083 p_lcb = list_node(p_node);
1084 #if (BLE_INCLUDED == TRUE)
1085 L2CAP_TRACE_DEBUG("window = %d,robin_unacked = %d,robin_quota=%d",l2cb.controller_le_xmit_window,l2cb.ble_round_robin_unacked,l2cb.ble_round_robin_quota);
1086 #endif ///BLE_INCLUDED == TRUE
1087 /* If controller window is full, nothing to do */
1088 if (((l2cb.controller_xmit_window == 0 ||
1089 (l2cb.round_robin_unacked >= l2cb.round_robin_quota))
1090 #if (BLE_INCLUDED == TRUE)
1091 && (p_lcb->transport == BT_TRANSPORT_BR_EDR)
1092 )
1093 || (p_lcb->transport == BT_TRANSPORT_LE &&
1094 (l2cb.ble_round_robin_unacked >= l2cb.ble_round_robin_quota ||
1095 l2cb.controller_le_xmit_window == 0 )))
1096 #else
1097 ))
1098 #endif ///BLE_INCLUDED == TRUE
1099 break;
1100
1101
1102 /* Check for wraparound */
1103 if (p_node == list_end(l2cb.p_lcb_pool)) {
1104 p_node = list_begin(l2cb.p_lcb_pool);
1105 p_lcb = list_node(p_node);
1106 }
1107 L2CAP_TRACE_DEBUG("in_use=%d,segment_being_sent=%d,link_state=%d,link_xmit_quota=%d",p_lcb->in_use,p_lcb->partial_segment_being_sent,p_lcb->link_state,p_lcb->link_xmit_quota);
1108 if ( (!p_lcb->in_use)
1109 || (p_lcb->partial_segment_being_sent)
1110 || (p_lcb->link_state != LST_CONNECTED)
1111 || (p_lcb->link_xmit_quota != 0)
1112 || (L2C_LINK_CHECK_POWER_MODE (p_lcb)) ) {
1113 continue;
1114 }
1115
1116 /* See if we can send anything from the Link Queue */
1117 if (!list_is_empty(p_lcb->link_xmit_data_q)) {
1118 p_buf = (BT_HDR *)list_front(p_lcb->link_xmit_data_q);
1119 list_remove(p_lcb->link_xmit_data_q, p_buf);
1120 l2c_link_send_to_lower (p_lcb, p_buf);
1121 } else if (single_write) {
1122 /* If only doing one write, break out */
1123 break;
1124 }
1125 /* If nothing on the link queue, check the channel queue */
1126 else if ((p_buf = l2cu_get_next_buffer_to_send (p_lcb)) != NULL) {
1127 l2c_link_send_to_lower (p_lcb, p_buf);
1128 }
1129 }
1130
1131 /* If we finished without using up our quota, no need for a safety check */
1132 if ( (l2cb.controller_xmit_window > 0)
1133 && (l2cb.round_robin_unacked < l2cb.round_robin_quota)
1134 #if (BLE_INCLUDED == TRUE)
1135 && (p_lcb->transport == BT_TRANSPORT_BR_EDR)
1136 #endif
1137 ) {
1138 l2cb.check_round_robin = FALSE;
1139 }
1140
1141 #if (BLE_INCLUDED == TRUE)
1142 if ( (l2cb.controller_le_xmit_window > 0)
1143 && (l2cb.ble_round_robin_unacked < l2cb.ble_round_robin_quota)
1144 && (p_lcb->transport == BT_TRANSPORT_LE)) {
1145 l2cb.ble_check_round_robin = FALSE;
1146 }
1147 #endif
1148 } else { /* if this is not round-robin service */
1149 /* If a partial segment is being sent, can't send anything else */
1150 L2CAP_TRACE_DEBUG("partial_segment_being_sent=%d,link_state=%d,power_mode=%d",p_lcb->partial_segment_being_sent,p_lcb->link_state,L2C_LINK_CHECK_POWER_MODE (p_lcb));
1151 if ( (p_lcb->partial_segment_being_sent)
1152 || (p_lcb->link_state != LST_CONNECTED)
1153 || (L2C_LINK_CHECK_POWER_MODE (p_lcb)) ) {
1154 return;
1155 }
1156
1157 /* See if we can send anything from the link queue */
1158 #if (BLE_INCLUDED == TRUE)
1159 while ( ((l2cb.controller_xmit_window != 0 && (p_lcb->transport == BT_TRANSPORT_BR_EDR)) ||
1160 (l2cb.controller_le_xmit_window != 0 && (p_lcb->transport == BT_TRANSPORT_LE)))
1161 && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
1162 #else
1163 while ( (l2cb.controller_xmit_window != 0)
1164 && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
1165 #endif
1166 {
1167 if (list_is_empty(p_lcb->link_xmit_data_q)) {
1168 break;
1169 }
1170
1171 p_buf = (BT_HDR *)list_front(p_lcb->link_xmit_data_q);
1172 list_remove(p_lcb->link_xmit_data_q, p_buf);
1173 if (!l2c_link_send_to_lower (p_lcb, p_buf)) {
1174 break;
1175 }
1176 }
1177
1178 if (!single_write) {
1179 /* See if we can send anything for any channel */
1180 #if (BLE_INCLUDED == TRUE)
1181 while ( ((l2cb.controller_xmit_window != 0 && (p_lcb->transport == BT_TRANSPORT_BR_EDR)) ||
1182 (l2cb.controller_le_xmit_window != 0 && (p_lcb->transport == BT_TRANSPORT_LE)))
1183 && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
1184 #else
1185 while ((l2cb.controller_xmit_window != 0) && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota))
1186 #endif
1187 {
1188 //need check flag: partial_segment_being_sent
1189 if ( (p_lcb->partial_segment_being_sent)
1190 || (p_lcb->link_state != LST_CONNECTED)
1191 || (L2C_LINK_CHECK_POWER_MODE (p_lcb)) ) {
1192 break;
1193 }
1194 //L2CAP_TRACE_DEBUG("l2cu_get_next_buffer_to_send = %p",l2cu_get_next_buffer_to_send(p_lcb));
1195 if ((p_buf = l2cu_get_next_buffer_to_send (p_lcb)) == NULL) {
1196 break;
1197 }
1198
1199 if (!l2c_link_send_to_lower (p_lcb, p_buf)) {
1200 break;
1201 }
1202 }
1203 }
1204
1205 /* There is a special case where we have readjusted the link quotas and */
1206 /* this link may have sent anything but some other link sent packets so */
1207 /* so we may need a timer to kick off this link's transmissions. */
1208 if ( (!list_is_empty(p_lcb->link_xmit_data_q)) && (p_lcb->sent_not_acked < p_lcb->link_xmit_quota) ) {
1209 btu_start_timer (&p_lcb->timer_entry, BTU_TTYPE_L2CAP_LINK, L2CAP_LINK_FLOW_CONTROL_TOUT);
1210 }
1211 }
1212
1213 }
1214
1215 /*******************************************************************************
1216 **
1217 ** Function l2c_link_send_to_lower
1218 **
1219 ** Description This function queues the buffer for HCI transmission
1220 **
1221 ** Returns TRUE for success, FALSE for fail
1222 **
1223 *******************************************************************************/
l2c_link_send_to_lower(tL2C_LCB * p_lcb,BT_HDR * p_buf)1224 static BOOLEAN l2c_link_send_to_lower (tL2C_LCB *p_lcb, BT_HDR *p_buf)
1225 {
1226 UINT16 num_segs;
1227 UINT16 xmit_window, acl_data_size;
1228 const controller_t *controller = controller_get_interface();
1229 L2CAP_TRACE_DEBUG("%s",__func__);
1230 if ((p_buf->len <= controller->get_acl_packet_size_classic()
1231 #if (BLE_INCLUDED == TRUE)
1232 && (p_lcb->transport == BT_TRANSPORT_BR_EDR)) ||
1233 ((p_lcb->transport == BT_TRANSPORT_LE) && (p_buf->len <= controller->get_acl_packet_size_ble()))
1234 #else
1235 )
1236 #endif
1237 ) {
1238 if (p_lcb->link_xmit_quota == 0) {
1239 #if (BLE_INCLUDED == TRUE)
1240 if (p_lcb->transport == BT_TRANSPORT_LE) {
1241 l2cb.ble_round_robin_unacked++;
1242 } else
1243 #endif
1244 l2cb.round_robin_unacked++;
1245 }
1246 p_lcb->sent_not_acked++;
1247 p_buf->layer_specific = 0;
1248
1249 #if (BLE_INCLUDED == TRUE)
1250 if (p_lcb->transport == BT_TRANSPORT_LE) {
1251 l2cb.controller_le_xmit_window--;
1252 bte_main_hci_send(p_buf, (UINT16)(BT_EVT_TO_LM_HCI_ACL | LOCAL_BLE_CONTROLLER_ID));
1253 } else
1254 #endif
1255 {
1256 l2cb.controller_xmit_window--;
1257 bte_main_hci_send(p_buf, BT_EVT_TO_LM_HCI_ACL);
1258 }
1259 } else {
1260 #if BLE_INCLUDED == TRUE
1261 if (p_lcb->transport == BT_TRANSPORT_LE) {
1262 acl_data_size = controller->get_acl_data_size_ble();
1263 xmit_window = l2cb.controller_le_xmit_window;
1264
1265 } else
1266 #endif
1267 {
1268 acl_data_size = controller->get_acl_data_size_classic();
1269 xmit_window = l2cb.controller_xmit_window;
1270 }
1271 num_segs = (p_buf->len - HCI_DATA_PREAMBLE_SIZE + acl_data_size - 1) / acl_data_size;
1272
1273
1274 /* If doing round-robin, then only 1 segment each time */
1275 if (p_lcb->link_xmit_quota == 0) {
1276 num_segs = 1;
1277 p_lcb->partial_segment_being_sent = TRUE;
1278 } else {
1279 /* Multi-segment packet. Make sure it can fit */
1280 if (num_segs > xmit_window) {
1281 num_segs = xmit_window;
1282 p_lcb->partial_segment_being_sent = TRUE;
1283 }
1284
1285 if (num_segs > (p_lcb->link_xmit_quota - p_lcb->sent_not_acked)) {
1286 num_segs = (p_lcb->link_xmit_quota - p_lcb->sent_not_acked);
1287 p_lcb->partial_segment_being_sent = TRUE;
1288 }
1289 }
1290
1291 p_buf->layer_specific = num_segs;
1292 #if BLE_INCLUDED == TRUE
1293 if (p_lcb->transport == BT_TRANSPORT_LE) {
1294 l2cb.controller_le_xmit_window -= num_segs;
1295 if (p_lcb->link_xmit_quota == 0) {
1296 l2cb.ble_round_robin_unacked += num_segs;
1297 }
1298 } else
1299 #endif
1300 {
1301 l2cb.controller_xmit_window -= num_segs;
1302
1303 if (p_lcb->link_xmit_quota == 0) {
1304 l2cb.round_robin_unacked += num_segs;
1305 }
1306 }
1307
1308 p_lcb->sent_not_acked += num_segs;
1309 #if BLE_INCLUDED == TRUE
1310 if (p_lcb->transport == BT_TRANSPORT_LE) {
1311 bte_main_hci_send(p_buf, (UINT16)(BT_EVT_TO_LM_HCI_ACL | LOCAL_BLE_CONTROLLER_ID));
1312 } else
1313 #endif
1314 {
1315 bte_main_hci_send(p_buf, BT_EVT_TO_LM_HCI_ACL);
1316 }
1317 }
1318
1319 #if (L2CAP_HCI_FLOW_CONTROL_DEBUG == TRUE)
1320 #if (BLE_INCLUDED == TRUE)
1321 if (p_lcb->transport == BT_TRANSPORT_LE) {
1322 L2CAP_TRACE_DEBUG ("TotalWin=%d,Hndl=0x%x,Quota=%d,Unack=%d,RRQuota=%d,RRUnack=%d",
1323 l2cb.controller_le_xmit_window,
1324 p_lcb->handle,
1325 p_lcb->link_xmit_quota, p_lcb->sent_not_acked,
1326 l2cb.ble_round_robin_quota, l2cb.ble_round_robin_unacked);
1327 } else
1328 #endif
1329 {
1330 L2CAP_TRACE_DEBUG ("TotalWin=%d,Hndl=0x%x,Quota=%d,Unack=%d,RRQuota=%d,RRUnack=%d",
1331 l2cb.controller_xmit_window,
1332 p_lcb->handle,
1333 p_lcb->link_xmit_quota, p_lcb->sent_not_acked,
1334 l2cb.round_robin_quota, l2cb.round_robin_unacked);
1335 }
1336 #endif
1337
1338 return TRUE;
1339 }
1340
1341 /*******************************************************************************
1342 **
1343 ** Function l2c_link_process_num_completed_pkts
1344 **
1345 ** Description This function is called when a "number-of-completed-packets"
1346 ** event is received from the controller. It updates all the
1347 ** LCB transmit counts.
1348 **
1349 ** Returns void
1350 **
1351 *******************************************************************************/
l2c_link_process_num_completed_pkts(UINT8 * p)1352 void l2c_link_process_num_completed_pkts (UINT8 *p)
1353 {
1354 UINT8 num_handles, xx;
1355 UINT16 handle;
1356 UINT16 num_sent;
1357 tL2C_LCB *p_lcb;
1358
1359 STREAM_TO_UINT8 (num_handles, p);
1360
1361 for (xx = 0; xx < num_handles; xx++) {
1362 STREAM_TO_UINT16 (handle, p);
1363 STREAM_TO_UINT16 (num_sent, p);
1364
1365 p_lcb = l2cu_find_lcb_by_handle (handle);
1366
1367 /* Callback for number of completed packet event */
1368 /* Originally designed for [3DSG] */
1369 if ((p_lcb != NULL) && (p_lcb->p_nocp_cb)) {
1370 L2CAP_TRACE_DEBUG ("L2CAP - calling NoCP callback");
1371 (*p_lcb->p_nocp_cb)(p_lcb->remote_bd_addr);
1372 }
1373
1374 if (p_lcb) {
1375 #if (BLE_INCLUDED == TRUE)
1376 if (p_lcb && (p_lcb->transport == BT_TRANSPORT_LE)) {
1377 l2cb.controller_le_xmit_window += num_sent;
1378 } else
1379 #endif
1380 {
1381 /* Maintain the total window to the controller */
1382 l2cb.controller_xmit_window += num_sent;
1383 }
1384 /* If doing round-robin, adjust communal counts */
1385 if (p_lcb->link_xmit_quota == 0) {
1386 #if BLE_INCLUDED == TRUE
1387 if (p_lcb->transport == BT_TRANSPORT_LE) {
1388 /* Don't go negative */
1389 if (l2cb.ble_round_robin_unacked > num_sent) {
1390 l2cb.ble_round_robin_unacked -= num_sent;
1391 } else {
1392 l2cb.ble_round_robin_unacked = 0;
1393 }
1394 } else
1395 #endif
1396 {
1397 /* Don't go negative */
1398 if (l2cb.round_robin_unacked > num_sent) {
1399 l2cb.round_robin_unacked -= num_sent;
1400 } else {
1401 l2cb.round_robin_unacked = 0;
1402 }
1403 }
1404 }
1405
1406 /* Don't go negative */
1407 if (p_lcb->sent_not_acked > num_sent) {
1408 p_lcb->sent_not_acked -= num_sent;
1409 } else {
1410 p_lcb->sent_not_acked = 0;
1411 }
1412
1413 l2c_link_check_send_pkts (p_lcb, NULL, NULL);
1414
1415 /* If we were doing round-robin for low priority links, check 'em */
1416 if ( (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
1417 && (l2cb.check_round_robin)
1418 && (l2cb.round_robin_unacked < l2cb.round_robin_quota) ) {
1419 l2c_link_check_send_pkts (NULL, NULL, NULL);
1420 }
1421 #if BLE_INCLUDED == TRUE
1422 if ((p_lcb->transport == BT_TRANSPORT_LE)
1423 && (p_lcb->acl_priority == L2CAP_PRIORITY_HIGH)
1424 && ((l2cb.ble_check_round_robin)
1425 && (l2cb.ble_round_robin_unacked < l2cb.ble_round_robin_quota))) {
1426 l2c_link_check_send_pkts (NULL, NULL, NULL);
1427 }
1428 #endif
1429 }
1430
1431 #if (L2CAP_HCI_FLOW_CONTROL_DEBUG == TRUE)
1432 if (p_lcb) {
1433 #if (BLE_INCLUDED == TRUE)
1434 if (p_lcb->transport == BT_TRANSPORT_LE) {
1435 L2CAP_TRACE_DEBUG ("TotalWin=%d,LinkUnack(0x%x)=%d,RRCheck=%d,RRUnack=%d\n",
1436 l2cb.controller_le_xmit_window,
1437 p_lcb->handle, p_lcb->sent_not_acked,
1438 l2cb.ble_check_round_robin, l2cb.ble_round_robin_unacked);
1439 } else
1440 #endif
1441 {
1442 L2CAP_TRACE_DEBUG ("TotalWin=%d,LinkUnack(0x%x)=%d,RRCheck=%d,RRUnack=%d\n",
1443 l2cb.controller_xmit_window,
1444 p_lcb->handle, p_lcb->sent_not_acked,
1445 l2cb.check_round_robin, l2cb.round_robin_unacked);
1446
1447 }
1448 } else {
1449 #if (BLE_INCLUDED == TRUE)
1450 L2CAP_TRACE_DEBUG ("TotalWin=%d LE_Win: %d, Handle=0x%x, RRCheck=%d, RRUnack=%d\n",
1451 l2cb.controller_xmit_window,
1452 l2cb.controller_le_xmit_window,
1453 handle,
1454 l2cb.ble_check_round_robin, l2cb.ble_round_robin_unacked);
1455 #else
1456 L2CAP_TRACE_DEBUG ("TotalWin=%d Handle=0x%x RRCheck=%d RRUnack=%d\n",
1457 l2cb.controller_xmit_window,
1458 handle,
1459 l2cb.check_round_robin, l2cb.round_robin_unacked);
1460 #endif
1461 }
1462 #endif
1463 }
1464
1465 #if (defined(HCILP_INCLUDED) && HCILP_INCLUDED == TRUE)
1466 /* only full stack can enable sleep mode */
1467 btu_check_bt_sleep ();
1468 #endif
1469 }
1470
1471 /*******************************************************************************
1472 **
1473 ** Function l2c_link_segments_xmitted
1474 **
1475 ** Description This function is called from the HCI Interface when an ACL
1476 ** data packet segment is transmitted.
1477 **
1478 ** Returns void
1479 **
1480 *******************************************************************************/
l2c_link_segments_xmitted(BT_HDR * p_msg)1481 void l2c_link_segments_xmitted (BT_HDR *p_msg)
1482 {
1483 UINT8 *p = (UINT8 *)(p_msg + 1) + p_msg->offset;
1484 UINT16 handle;
1485 tL2C_LCB *p_lcb;
1486
1487 /* Extract the handle */
1488 STREAM_TO_UINT16 (handle, p);
1489 handle = HCID_GET_HANDLE (handle);
1490
1491 /* Find the LCB based on the handle */
1492 if ((p_lcb = l2cu_find_lcb_by_handle (handle)) == NULL) {
1493 L2CAP_TRACE_WARNING ("L2CAP - rcvd segment complete, unknown handle: %d\n", handle);
1494 osi_free (p_msg);
1495 return;
1496 }
1497
1498 if (p_lcb->link_state == LST_CONNECTED) {
1499 /* Enqueue the buffer to the head of the transmit queue, and see */
1500 /* if we can transmit anything more. */
1501 list_prepend(p_lcb->link_xmit_data_q, p_msg);
1502
1503 p_lcb->partial_segment_being_sent = FALSE;
1504
1505 l2c_link_check_send_pkts (p_lcb, NULL, NULL);
1506 } else {
1507 osi_free (p_msg);
1508 }
1509 }
1510
